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BOOK.T：源码内容

13881 }
13882 cons->c_column = 0;
13883 flush(cons);
13884 }
.Op 191 src/kernel/console.c
13885 if (cons->c_rwords == buflen(cons->c_ramqueue)) flush(cons);
13886 cons->c_ramqueue[cons->c_rwords++] = cons->c_attr | (c & BYTE);
13887 cons->c_column++; /* next column */
13888 return;
13889 }
13890 }
13893 /*===========================================================================*
13894 * scroll_screen *
13895 *===========================================================================*/
13896 PRIVATE void scroll_screen(cons, dir)
13897 register console_t *cons; /* pointer to console struct */
13898 int dir; /* SCROLL_UP or SCROLL_DOWN */
13899 {
13900 unsigned new_line, new_org, chars;
13901
13902 flush(cons);
13903 chars = scr_size - scr_width; /* one screen minus one line */
13904
13905 /* Scrolling the screen is a real nuisance due to the various incompatible
13906 * video cards. This driver supports software scrolling (Hercules?),
13907 * hardware scrolling (mono and CGA cards) and hardware scrolling without
13908 * wrapping (EGA and VGA cards). In the latter case we must make sure that
13909 * c_start <= c_org && c_org + scr_size <= c_limit
13910 * holds, because EGA and VGA don't wrap around the end of video memory.
13911 */
13912 if (dir == SCROLL_UP) {
13913 /* Scroll one line up in 3 ways: soft, avoid wrap, use origin. */
13914 if (softscroll) {
13915 vid_vid_copy(cons->c_start + scr_width, cons->c_start, chars);
13916 } else
13917 if (!wrap && cons->c_org + scr_size + scr_width >= cons->c_limit) {
13918 vid_vid_copy(cons->c_org + scr_width, cons->c_start, chars);
13919 cons->c_org = cons->c_start;
13920 } else {
13921 cons->c_org = (cons->c_org + scr_width) & vid_mask;
13922 }
13923 new_line = (cons->c_org + chars) & vid_mask;
13924 } else {
13925 /* Scroll one line down in 3 ways: soft, avoid wrap, use origin. */
13926 if (softscroll) {
13927 vid_vid_copy(cons->c_start, cons->c_start + scr_width, chars);
13928 } else
13929 if (!wrap && cons->c_org < cons->c_start + scr_width) {
13930 new_org = cons->c_limit - scr_size;
13931 vid_vid_copy(cons->c_org, new_org + scr_width, chars);
13932 cons->c_org = new_org;
13933 } else {
13934 cons->c_org = (cons->c_org - scr_width) & vid_mask;
13935 }
13936 new_line = cons->c_org;
13937 }
13938 /* Blank the new line at top or bottom. */
13939 blank_color = cons->c_blank;
13940 mem_vid_copy(BLANK_MEM, new_line, scr_width);
13941
13942 /* Set the new video origin. */
13943 if (cons == curcons) set_6845(VID_ORG, cons->c_org);
13944 flush(cons);
.Ep 192 src/kernel/console.c
13945 }
13948 /*===========================================================================*
13949 * flush *
13950 *===========================================================================*/
13951 PRIVATE void flush(cons)
13952 register console_t *cons; /* pointer to console struct */
13953 {
13954 /* Send characters buffered in 'ramqueue' to screen memory, check the new
13955 * cursor position, compute the new hardware cursor position and set it.
13956 */
13957 unsigned cur;
13958 tty_t *tp = cons->c_tty;
13959
13960 /* Have the characters in 'ramqueue' transferred to the screen. */
13961 if (cons->c_rwords > 0) {
13962 mem_vid_copy(cons->c_ramqueue, cons->c_cur, cons->c_rwords);
13963 cons->c_rwords = 0;
13964
13965 /* TTY likes to know the current column and if echoing messed up. */
13966 tp->tty_position = cons->c_column;
13967 tp->tty_reprint = TRUE;
13968 }
13969
13970 /* Check and update the cursor position. */
13971 if (cons->c_column < 0) cons->c_column = 0;
13972 if (cons->c_column > scr_width) cons->c_column = scr_width;
13973 if (cons->c_row < 0) cons->c_row = 0;
13974 if (cons->c_row >= scr_lines) cons->c_row = scr_lines - 1;
13975 cur = cons->c_org + cons->c_row * scr_width + cons->c_column;
13976 if (cur != cons->c_cur) {
13977 if (cons == curcons) set_6845(CURSOR, cur);
13978 cons->c_cur = cur;
13979 }
13980 }
13983 /*===========================================================================*
13984 * parse_escape *
13985 *===========================================================================*/
13986 PRIVATE void parse_escape(cons, c)
13987 register console_t *cons; /* pointer to console struct */
13988 char c; /* next character in escape sequence */
13989 {
13990 /* The following ANSI escape sequences are currently supported.
13991 * If n and/or m are omitted, they default to 1. Omitted s defaults to 0.
13992 * ESC [nA moves up n lines
13993 * ESC [nB moves down n lines
13994 * ESC [nC moves right n spaces
13995 * ESC [nD moves left n spaces
13996 * ESC [m;nH moves cursor to (m,n)
13997 * ESC [sJ clears screen relative to cursor (0 to end, 1 from start, 2 all)
13998 * ESC [sK clears line relative to cursor (0 to end, 1 from start, 2 all)
13999 * ESC [nL inserts n lines at cursor
14000 * ESC [nM deletes n lines at cursor
14001 * ESC [nP deletes n chars at cursor
14002 * ESC [n@ inserts n chars at cursor
14003 * ESC [nm enables rendition n (0= normal, 1=bold, 4=underline, 5=blinking,
14004 * 7=reverse, 30..37 set foreground color, 40..47 set background color)
.Op 193 src/kernel/console.c
14005 * ESC M scrolls the screen backwards if the cursor is on the top line
14006 */
14007
14008 switch (cons->c_esc_state) {
14009 case 1: /* ESC seen */
14010 cons->c_esc_intro = '';
14011 cons->c_esc_parmp = cons->c_esc_parmv;
14012 cons->c_esc_parmv[0] = cons->c_esc_parmv[1] = 0;
14013 switch (c) {
14014 case '[': /* Control Sequence Introducer */
14015 cons->c_esc_intro = c;
14016 cons->c_esc_state = 2;
14017 break;
14018 case 'M': /* Reverse Index */
14019 do_escape(cons, c);
14020 break;
14021 default:
14022 cons->c_esc_state = 0;
14023 }
14024 break;
14025
14026 case 2: /* ESC [ seen */
14027 if (c >= '0' && c <= '9') {
14028 if (cons->c_esc_parmp < bufend(cons->c_esc_parmv))
14029 *cons->c_esc_parmp = *cons->c_esc_parmp * 10 + (c-'0');
14030 } else
14031 if (c == ';') {
14032 if (++cons->c_esc_parmp < bufend(cons->c_esc_parmv))
14033 *cons->c_esc_parmp = 0;
14034 } else {
14035 do_escape(cons, c);
14036 }
14037 break;
14038 }
14039 }
14042 /*===========================================================================*
14043 * do_escape *
14044 *===========================================================================*/
14045 PRIVATE void do_escape(cons, c)
14046 register console_t *cons; /* pointer to console struct */
14047 char c; /* next character in escape sequence */
14048 {
14049 int value, n;
14050 unsigned src, dst, count;
14051
14052 /* Some of these things hack on screen RAM, so it had better be up to date */
14053 flush(cons);
14054
14055 if (cons->c_esc_intro == '') {
14056 /* Handle a sequence beginning with just ESC */
14057 switch (c) {
14058 case 'M': /* Reverse Index */
14059 if (cons->c_row == 0) {
14060 scroll_screen(cons, SCROLL_DOWN);
14061 } else {
14062 cons->c_row--;
14063 }
14064 flush(cons);
.Ep 194 src/kernel/console.c
14065 break;
14066
14067 default: break;
14068 }
14069 } else
14070 if (cons->c_esc_intro == '[') {
14071 /* Handle a sequence beginning with ESC [ and parameters */
14072 value = cons->c_esc_parmv[0];
14073 switch (c) {
14074 case 'A': /* ESC [nA moves up n lines */
14075 n = (value == 0 ? 1 : value);
14076 cons->c_row -= n;
14077 flush(cons);
14078 break;
14079
14080 case 'B': /* ESC [nB moves down n lines */
14081 n = (value == 0 ? 1 : value);
14082 cons->c_row += n;
14083 flush(cons);
14084 break;
14085
14086 case 'C': /* ESC [nC moves right n spaces */
14087 n = (value == 0 ? 1 : value);
14088 cons->c_column += n;
14089 flush(cons);
14090 break;
14091
14092 case 'D': /* ESC [nD moves left n spaces */
14093 n = (value == 0 ? 1 : value);
14094 cons->c_column -= n;
14095 flush(cons);
14096 break;
14097
14098 case 'H': /* ESC [m;nH" moves cursor to (m,n) */
14099 cons->c_row = cons->c_esc_parmv[0] - 1;
14100 cons->c_column = cons->c_esc_parmv[1] - 1;
14101 flush(cons);
14102 break;
14103
14104 case 'J': /* ESC [sJ clears in display */
14105 switch (value) {
14106 case 0: /* Clear from cursor to end of screen */
14107 count = scr_size - (cons->c_cur - cons->c_org);
14108 dst = cons->c_cur;
14109 break;
14110 case 1: /* Clear from start of screen to cursor */
14111 count = cons->c_cur - cons->c_org;
14112 dst = cons->c_org;
14113 break;
14114 case 2: /* Clear entire screen */
14115 count = scr_size;
14116 dst = cons->c_org;
14117 break;
14118 default: /* Do nothing */
14119 count = 0;
14120 dst = cons->c_org;
14121 }
14122 blank_color = cons->c_blank;
14123 mem_vid_copy(BLANK_MEM, dst, count);
14124 break;
.Op 195 src/kernel/console.c
14125
14126 case 'K': /* ESC [sK clears line from cursor */
14127 switch (value) {
14128 case 0: /* Clear from cursor to end of line */
14129 count = scr_width - cons->c_column;
14130 dst = cons->c_cur;
14131 break;
14132 case 1: /* Clear from beginning of line to cursor */
14133 count = cons->c_column;
14134 dst = cons->c_cur - cons->c_column;
14135 break;
14136 case 2: /* Clear entire line */
14137 count = scr_width;
14138 dst = cons->c_cur - cons->c_column;
14139 break;
14140 default: /* Do nothing */
14141 count = 0;
14142 dst = cons->c_cur;
14143 }
14144 blank_color = cons->c_blank;
14145 mem_vid_copy(BLANK_MEM, dst, count);
14146 break;
14147
14148 case 'L': /* ESC [nL inserts n lines at cursor */
14149 n = value;
14150 if (n < 1) n = 1;
14151 if (n > (scr_lines - cons->c_row))
14152 n = scr_lines - cons->c_row;
14153
14154 src = cons->c_org + cons->c_row * scr_width;
14155 dst = src + n * scr_width;
14156 count = (scr_lines - cons->c_row - n) * scr_width;
14157 vid_vid_copy(src, dst, count);
14158 blank_color = cons->c_blank;
14159 mem_vid_copy(BLANK_MEM, src, n * scr_width);
14160 break;
14161
14162 case 'M': /* ESC [nM deletes n lines at cursor */
14163 n = value;
14164 if (n < 1) n = 1;
14165 if (n > (scr_lines - cons->c_row))
14166 n = scr_lines - cons->c_row;
14167
14168 dst = cons->c_org + cons->c_row * scr_width;
14169 src = dst + n * scr_width;
14170 count = (scr_lines - cons->c_row - n) * scr_width;
14171 vid_vid_copy(src, dst, count);
14172 blank_color = cons->c_blank;
14173 mem_vid_copy(BLANK_MEM, dst + count, n * scr_width);
14174 break;
14175
14176 case '@': /* ESC [n@ inserts n chars at cursor */
14177 n = value;
14178 if (n < 1) n = 1;
14179 if (n > (scr_width - cons->c_column))
14180 n = scr_width - cons->c_column;
14181
14182 src = cons->c_cur;
14183 dst = src + n;
14184 count = scr_width - cons->c_column - n;
.Ep 196 src/kernel/console.c
14185 vid_vid_copy(src, dst, count);
14186 blank_color = cons->c_blank;
14187 mem_vid_copy(BLANK_MEM, src, n);
14188 break;
14189
14190 case 'P': /* ESC [nP deletes n chars at cursor */
14191 n = value;
14192 if (n < 1) n = 1;
14193 if (n > (scr_width - cons->c_column))
14194 n = scr_width - cons->c_column;
14195
14196 dst = cons->c_cur;
14197 src = dst + n;
14198 count = scr_width - cons->c_column - n;
14199 vid_vid_copy(src, dst, count);
14200 blank_color = cons->c_blank;
14201 mem_vid_copy(BLANK_MEM, dst + count, n);
14202 break;
14203
14204 case 'm': /* ESC [nm enables rendition n */
14205 switch (value) {
14206 case 1: /* BOLD */
14207 if (color) {
14208 /* Can't do bold, so use yellow */
14209 cons->c_attr = (cons->c_attr & 0xf0ff) | 0x0E00;
14210 } else {
14211 /* Set intensity bit */
14212 cons->c_attr |= 0x0800;
14213 }
14214 break;
14215
14216 case 4: /* UNDERLINE */
14217 if (color) {
14218 /* Use light green */
14219 cons->c_attr = (cons->c_attr & 0xf0ff) | 0x0A00;
14220 } else {
14221 cons->c_attr = (cons->c_attr & 0x8900);
14222 }
14223 break;
14224
14225 case 5: /* BLINKING */
14226 if (color) {
14227 /* Use magenta */
14228 cons->c_attr = (cons->c_attr & 0xf0ff) | 0x0500;
14229 } else {
14230 /* Set the blink bit */
14231 cons->c_attr |= 0x8000;
14232 }
14233 break;
14234
14235 case 7: /* REVERSE */
14236 if (color) {
14237 /* Swap fg and bg colors */
14238 cons->c_attr =
14239 ((cons->c_attr & 0xf000) >> 4) |
14240 ((cons->c_attr & 0x0f00) << 4);
14241 } else
14242 if ((cons->c_attr & 0x7000) == 0) {
14243 cons->c_attr = (cons->c_attr & 0x8800) | 0x7000;
14244 } else {
.Op 197 src/kernel/console.c
14245 cons->c_attr = (cons->c_attr & 0x8800) | 0x0700;
14246 }
14247 break;
14248
14249 default: /* COLOR */
14250 if (30 <= value && value <= 37) {
14251 cons->c_attr =
14252 (cons->c_attr & 0xf0ff) |
14253 (ansi_colors[(value - 30)] << 8);
14254 cons->c_blank =
14255 (cons->c_blank & 0xf0ff) |
14256 (ansi_colors[(value - 30)] << 8);
14257 } else
14258 if (40 <= value && value <= 47) {
14259 cons->c_attr =
14260 (cons->c_attr & 0x0fff) |
14261 (ansi_colors[(value - 40)] << 12);
14262 cons->c_blank =
14263 (cons->c_blank & 0x0fff) |
14264 (ansi_colors[(value - 40)] << 12);
14265 } else {
14266 cons->c_attr = cons->c_blank;
14267 }
14268 break;
14269 }
14270 break;
14271 }
14272 }
14273 cons->c_esc_state = 0;
14274 }
14277 /*===========================================================================*
14278 * set_6845 *
14279 *===========================================================================*/
14280 PRIVATE void set_6845(reg, val)
14281 int reg; /* which register pair to set */
14282 unsigned val; /* 16-bit value to set it to */
14283 {
14284 /* Set a register pair inside the 6845.
14285 * Registers 12-13 tell the 6845 where in video ram to start
14286 * Registers 14-15 tell the 6845 where to put the cursor
14287 */
14288 lock(); /* try to stop h/w loading in-between value */
14289 out_byte(vid_port + INDEX, reg); /* set the index register */
14290 out_byte(vid_port + DATA, (val>>8) & BYTE); /* output high byte */
14291 out_byte(vid_port + INDEX, reg + 1); /* again */
14292 out_byte(vid_port + DATA, val&BYTE); /* output low byte */
14293 unlock();
14294 }
14297 /*===========================================================================*
14298 * beep *
14299 *===========================================================================*/
14300 PRIVATE void beep()
14301 {
14302 /* Making a beeping sound on the speaker (output for CRTL-G).
14303 * This routine works by turning on the bits 0 and 1 in port B of the 8255
14304 * chip that drives the speaker.
.Ep 198 src/kernel/console.c
14305 */
14306
14307 message mess;
14308
14309 if (beeping) return;
14310 out_byte(TIMER_MODE, 0xB6); /* set up timer channel 2 (square wave) */
14311 out_byte(TIMER2, BEEP_FREQ & BYTE); /* load low-order bits of frequency */
14312 out_byte(TIMER2, (BEEP_FREQ >> 8) & BYTE); /* now high-order bits */
14313 lock(); /* guard PORT_B from keyboard intr handler */
14314 out_byte(PORT_B, in_byte(PORT_B) | 3); /* turn on beep bits */
14315 unlock();
14316 beeping = TRUE;
14317
14318 mess.m_type = SET_ALARM;
14319 mess.CLOCK_PROC_NR = TTY;
14320 mess.DELTA_TICKS = B_TIME;
14321 mess.FUNC_TO_CALL = (sighandler_t) stop_beep;
14322 sendrec(CLOCK, &mess);
14323 }
14326 /*===========================================================================*
14327 * stop_beep *
14328 *===========================================================================*/
14329 PRIVATE void stop_beep()
14330 {
14331 /* Turn off the beeper by turning off bits 0 and 1 in PORT_B. */
14332
14333 lock(); /* guard PORT_B from keyboard intr handler */
14334 out_byte(PORT_B, in_byte(PORT_B) & ~3);
14335 beeping = FALSE;
14336 unlock();
14337 }
14340 /*===========================================================================*
14341 * scr_init *
14342 *===========================================================================*/
14343 PUBLIC void scr_init(tp)
14344 tty_t *tp;
14345 {
14346 /* Initialize the screen driver. */
14347 console_t *cons;
14348 phys_bytes vid_base;
14349 u16_t bios_crtbase;
14350 int line;
14351 unsigned page_size;
14352
14353 /* Associate console and TTY. */
14354 line = tp - &tty_table[0];
14355 if (line >= nr_cons) return;
14356 cons = &cons_table[line];
14357 cons->c_tty = tp;
14358 tp->tty_priv = cons;
14359
14360 /* Initialize the keyboard driver. */
14361 kb_init(tp);
14362
14363 /* Output functions. */
14364 tp->tty_devwrite = cons_write;
.Op 199 src/kernel/console.c
14365 tp->tty_echo = cons_echo;
14366
14367 /* Get the BIOS parameters that tells the VDU I/O base register. */
14368 phys_copy(0x463L, vir2phys(&bios_crtbase), 2L);
14369
14370 vid_port = bios_crtbase;
14371
14372 if (color) {
14373 vid_base = COLOR_BASE;
14374 vid_size = COLOR_SIZE;
14375 } else {
14376 vid_base = MONO_BASE;
14377 vid_size = MONO_SIZE;
14378 }
14379 if (ega) vid_size = EGA_SIZE; /* for both EGA and VGA */
14380 wrap = !ega;
14381
14382 vid_seg = protected_mode ? VIDEO_SELECTOR : physb_to_hclick(vid_base);
14383 init_dataseg(&gdt[VIDEO_INDEX], vid_base, (phys_bytes) vid_size,
14384 TASK_PRIVILEGE);
14385 vid_size >>= 1; /* word count */
14386 vid_mask = vid_size - 1;
14387
14388 /* There can be as many consoles as video memory allows. */
14389 nr_cons = vid_size / scr_size;
14390 if (nr_cons > NR_CONS) nr_cons = NR_CONS;
14391 if (nr_cons > 1) wrap = 0;
14392 page_size = vid_size / nr_cons;
14393 cons->c_start = line * page_size;
14394 cons->c_limit = cons->c_start + page_size;
14395 cons->c_org = cons->c_start;
14396 cons->c_attr = cons->c_blank = BLANK_COLOR;
14397
14398 /* Clear the screen. */
14399 blank_color = BLANK_COLOR;
14400 mem_vid_copy(BLANK_MEM, cons->c_start, scr_size);
14401 select_console(0);
14402 }
14405 /*===========================================================================*
14406 * putk *
14407 *===========================================================================*/
14408 PUBLIC void putk(c)
14409 int c; /* character to print */
14410 {
14411 /* This procedure is used by the version of printf() that is linked with
14412 * the kernel itself. The one in the library sends a message to FS, which is
14413 * not what is needed for printing within the kernel. This version just queues
14414 * the character and starts the output.
14415 */
14416
14417 if (c != 0) {
14418 if (c == 'n') putk('r');
14419 out_char(&cons_table[0], (int) c);
14420 } else {
14421 flush(&cons_table[0]);
14422 }
14423 }
.Ep 200 src/kernel/console.c
14426 /*===========================================================================*
14427 * toggle_scroll *
14428 *===========================================================================*/
14429 PUBLIC void toggle_scroll()
14430 {
14431 /* Toggle between hardware and software scroll. */
14432
14433 cons_org0();
14434 softscroll = !softscroll;
14435 printf("%sware scrolling enabled.n", softscroll ? "Soft" : "Hard");
14436 }
14439 /*===========================================================================*
14440 * cons_stop *
14441 *===========================================================================*/
14442 PUBLIC void cons_stop()
14443 {
14444 /* Prepare for halt or reboot. */
14445
14446 cons_org0();
14447 softscroll = 1;
14448 select_console(0);
14449 cons_table[0].c_attr = cons_table[0].c_blank = BLANK_COLOR;
14450 }
14453 /*===========================================================================*
14454 * cons_org0 *
14455 *===========================================================================*/
14456 PRIVATE void cons_org0()
14457 {
14458 /* Scroll video memory back to put the origin at 0. */
14459
14460 int cons_line;
14461 console_t *cons;
14462 unsigned n;
14463
14464 for (cons_line = 0; cons_line < nr_cons; cons_line++) {
14465 cons = &cons_table[cons_line];
14466 while (cons->c_org > cons->c_start) {
14467 n = vid_size - scr_size; /* amount of unused memory */
14468 if (n > cons->c_org - cons->c_start)
14469 n = cons->c_org - cons->c_start;
14470 vid_vid_copy(cons->c_org, cons->c_org - n, scr_size);
14471 cons->c_org -= n;
14472 }
14473 flush(cons);
14474 }
14475 select_console(current);
14476 }
14479 /*===========================================================================*
14480 * select_console *
14481 *===========================================================================*/
14482 PUBLIC void select_console(int cons_line)
14483 {
14484 /* Set the current console to console number 'cons_line'. */
.Op 201 src/kernel/console.c
14485
14486 if (cons_line < 0 || cons_line >= nr_cons) return;
14487 current = cons_line;
14488 curcons = &cons_table[cons_line];
14489 set_6845(VID_ORG, curcons->c_org);
14490 set_6845(CURSOR, curcons->c_cur);
14491 }
14494 /*===========================================================================*
14495 * con_loadfont *
14496 *===========================================================================*/
14497 PUBLIC int con_loadfont(user_phys)
14498 phys_bytes user_phys;
14499 {
14500 /* Load a font into the EGA or VGA adapter. */
14501
14502 static struct sequence seq1[7] = {
14503 { GA_SEQUENCER_INDEX, 0x00, 0x01 },
14504 { GA_SEQUENCER_INDEX, 0x02, 0x04 },
14505 { GA_SEQUENCER_INDEX, 0x04, 0x07 },
14506 { GA_SEQUENCER_INDEX, 0x00, 0x03 },
14507 { GA_GRAPHICS_INDEX, 0x04, 0x02 },
14508 { GA_GRAPHICS_INDEX, 0x05, 0x00 },
14509 { GA_GRAPHICS_INDEX, 0x06, 0x00 },
14510 };
14511 static struct sequence seq2[7] = {
14512 { GA_SEQUENCER_INDEX, 0x00, 0x01 },
14513 { GA_SEQUENCER_INDEX, 0x02, 0x03 },
14514 { GA_SEQUENCER_INDEX, 0x04, 0x03 },
14515 { GA_SEQUENCER_INDEX, 0x00, 0x03 },
14516 { GA_GRAPHICS_INDEX, 0x04, 0x00 },
14517 { GA_GRAPHICS_INDEX, 0x05, 0x10 },
14518 { GA_GRAPHICS_INDEX, 0x06, 0 },
14519 };
14520
14521 seq2[6].value= color ? 0x0E : 0x0A;
14522
14523 if (!ega) return(ENOTTY);
14524
14525 lock();
14526 ga_program(seq1); /* bring font memory into view */
14527
14528 phys_copy(user_phys, (phys_bytes)GA_VIDEO_ADDRESS, (phys_bytes)GA_FONT_SIZE);
14529
14530 ga_program(seq2); /* restore */
14531 unlock();
14532
14533 return(OK);
14534 }
14537 /*===========================================================================*
14538 * ga_program *
14539 *===========================================================================*/
14540 PRIVATE void ga_program(seq)
14541 struct sequence *seq;
14542 {
14543 /* support function for con_loadfont */
14544
.Ep 202 src/kernel/console.c
14545 int len= 7;
14546 do {
14547 out_byte(seq->index, seq->port);
14548 out_byte(seq->index+1, seq->value);
14549 seq++;
14550 } while (--len > 0);
14551 }
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/dmp.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
14600 /* This file contains some dumping routines for debugging. */
14601
14602 #include "kernel.h"
14603 #include <minix/com.h>
14604 #include "proc.h"
14605
14606 char *vargv;
14607
14608 FORWARD _PROTOTYPE(char *proc_name, (int proc_nr));
14609
14610 /*===========================================================================*
14611 * p_dmp *
14612 *===========================================================================*/
14613 PUBLIC void p_dmp()
14614 {
14615 /* Proc table dump */
14616
14617 register struct proc *rp;
14618 static struct proc *oldrp = BEG_PROC_ADDR;
14619 int n = 0;
14620 phys_clicks text, data, size;
14621 int proc_nr;
14622
14623 printf("n--pid --pc- ---sp- flag -user --sys-- -text- -data- -size- -recv- commandn");
14624
14625 for (rp = oldrp; rp < END_PROC_ADDR; rp++) {
14626 proc_nr = proc_number(rp);
14627 if (rp->p_flags & P_SLOT_FREE) continue;
14628 if (++n > 20) break;
14629 text = rp->p_map[T].mem_phys;
14630 data = rp->p_map[D].mem_phys;
14631 size = rp->p_map[T].mem_len
14632 + ((rp->p_map[S].mem_phys + rp->p_map[S].mem_len) - data);
14633 printf("%5d %5lx %6lx %2x %7U %7U %5uK %5uK %5uK ",
14634 proc_nr < 0 ? proc_nr : rp->p_pid,
14635 (unsigned long) rp->p_reg.pc,
14636 (unsigned long) rp->p_reg.sp,
14637 rp->p_flags,
14638 rp->user_time, rp->sys_time,
14639 click_to_round_k(text), click_to_round_k(data),
14640 click_to_round_k(size));
14641 if (rp->p_flags & RECEIVING) {
14642 printf("%-7.7s", proc_name(rp->p_getfrom));
14643 } else
14644 if (rp->p_flags & SENDING) {
.Op 203 src/kernel/dmp.c
14645 printf("S:%-5.5s", proc_name(rp->p_sendto));
14646 } else
14647 if (rp->p_flags == 0) {
14648 printf(" ");
14649 }
14650 printf("%sn", rp->p_name);
14651 }
14652 if (rp == END_PROC_ADDR) rp = BEG_PROC_ADDR; else printf("--more--r");
14653 oldrp = rp;
14654 }
14657 /*===========================================================================*
14658 * map_dmp *
14659 *===========================================================================*/
14660 PUBLIC void map_dmp()
14661 {
14662 register struct proc *rp;
14663 static struct proc *oldrp = cproc_addr(HARDWARE);
14664 int n = 0;
14665 phys_clicks size;
14666
14667 printf("nPROC NAME- -----TEXT----- -----DATA----- ----STACK----- -SIZE-n");
14668 for (rp = oldrp; rp < END_PROC_ADDR; rp++) {
14669 if (rp->p_flags & P_SLOT_FREE) continue;
14670 if (++n > 20) break;
14671 size = rp->p_map[T].mem_len
14672 + ((rp->p_map[S].mem_phys + rp->p_map[S].mem_len)
14673 - rp->p_map[D].mem_phys);
14674 printf("%3d %-6.6s %4x %4x %4x %4x %4x %4x %4x %4x %4x %5uKn",
14675 proc_number(rp),
14676 rp->p_name,
14677 rp->p_map[T].mem_vir, rp->p_map[T].mem_phys, rp->p_map[T].mem_len,
14678 rp->p_map[D].mem_vir, rp->p_map[D].mem_phys, rp->p_map[D].mem_len,
14679 rp->p_map[S].mem_vir, rp->p_map[S].mem_phys, rp->p_map[S].mem_len,
14680 click_to_round_k(size));
14681 }
14682 if (rp == END_PROC_ADDR) rp = cproc_addr(HARDWARE); else printf("--more--r");
14683 oldrp = rp;
14684 }
14687 /*===========================================================================*
14688 * proc_name *
14689 *===========================================================================*/
14690 PRIVATE char *proc_name(proc_nr)
14691 int proc_nr;
14692 {
14693 if (proc_nr == ANY) return "ANY";
14694 return proc_addr(proc_nr)->p_name;
14695 }
.Ep 204 src/kernel/system.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/system.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
14700 /* This task handles the interface between file system and kernel as well as
14701 * between memory manager and kernel. System services are obtained by sending
14702 * sys_task() a message specifying what is needed. To make life easier for
14703 * MM and FS, a library is provided with routines whose names are of the
14704 * form sys_xxx, e.g. sys_xit sends the SYS_XIT message to sys_task. The
14705 * message types and parameters are:
14706 *
14707 * SYS_FORK informs kernel that a process has forked
14708 * SYS_NEWMAP allows MM to set up a process memory map
14709 * SYS_GETMAP allows MM to get a process' memory map
14710 * SYS_EXEC sets program counter and stack pointer after EXEC
14711 * SYS_XIT informs kernel that a process has exited
14712 * SYS_GETSP caller wants to read out some process' stack pointer
14713 * SYS_TIMES caller wants to get accounting times for a process
14714 * SYS_ABORT MM or FS cannot go on; abort MINIX
14715 * SYS_FRESH start with a fresh process image during EXEC (68000 only)
14716 * SYS_SENDSIG send a signal to a process (POSIX style)
14717 * SYS_SIGRETURN complete POSIX-style signalling
14718 * SYS_KILL cause a signal to be sent via MM
14719 * SYS_ENDSIG finish up after SYS_KILL-type signal
14720 * SYS_COPY request a block of data to be copied between processes
14721 * SYS_VCOPY request a series of data blocks to be copied between procs
14722 * SYS_GBOOT copies the boot parameters to a process
14723 * SYS_MEM returns the next free chunk of physical memory
14724 * SYS_UMAP compute the physical address for a given virtual address
14725 * SYS_TRACE request a trace operation
14726 *
14727 * Message types and parameters:
14728 *
14729 * m_type PROC1 PROC2 PID MEM_PTR
14730 * ------------------------------------------------------
14731 * | SYS_FORK | parent | child | pid | |
14732 * |------------+---------+---------+---------+---------|
14733 * | SYS_NEWMAP | proc nr | | | map ptr |
14734 * |------------+---------+---------+---------+---------|
14735 * | SYS_EXEC | proc nr | traced | new sp | |
14736 * |------------+---------+---------+---------+---------|
14737 * | SYS_XIT | parent | exitee | | |
14738 * |------------+---------+---------+---------+---------|
14739 * | SYS_GETSP | proc nr | | | |
14740 * |------------+---------+---------+---------+---------|
14741 * | SYS_TIMES | proc nr | | buf ptr | |
14742 * |------------+---------+---------+---------+---------|
14743 * | SYS_ABORT | | | | |
14744 * |------------+---------+---------+---------+---------|
14745 * | SYS_FRESH | proc nr | data_cl | | |
14746 * |------------+---------+---------+---------+---------|
14747 * | SYS_GBOOT | proc nr | | | bootptr |
14748 * |------------+---------+---------+---------+---------|
14749 * | SYS_GETMAP | proc nr | | | map ptr |
14750 * ------------------------------------------------------
14751 *
14752 * m_type m1_i1 m1_i2 m1_i3 m1_p1
14753 * ----------------+---------+---------+---------+--------------
14754 * | SYS_VCOPY | src p | dst p | vec siz | vc addr |
.Op 205 src/kernel/system.c
14755 * |---------------+---------+---------+---------+-------------|
14756 * | SYS_SENDSIG | proc nr | | | smp |
14757 * |---------------+---------+---------+---------+-------------|
14758 * | SYS_SIGRETURN | proc nr | | | scp |
14759 * |---------------+---------+---------+---------+-------------|
14760 * | SYS_ENDSIG | proc nr | | | |
14761 * -------------------------------------------------------------
14762 *
14763 * m_type m2_i1 m2_i2 m2_l1 m2_l2
14764 * ------------------------------------------------------
14765 * | SYS_TRACE | proc_nr | request | addr | data |
14766 * ------------------------------------------------------
14767 *
14768 *
14769 * m_type m6_i1 m6_i2 m6_i3 m6_f1
14770 * ------------------------------------------------------
14771 * | SYS_KILL | proc_nr | sig | | |
14772 * ------------------------------------------------------
14773 *
14774 *
14775 * m_type m5_c1 m5_i1 m5_l1 m5_c2 m5_i2 m5_l2 m5_l3
14776 * --------------------------------------------------------------------------
14777 * | SYS_COPY |src seg|src proc|src vir|dst seg|dst proc|dst vir| byte ct |
14778 * --------------------------------------------------------------------------
14779 * | SYS_UMAP | seg |proc nr |vir adr| | | | byte ct |
14780 * --------------------------------------------------------------------------
14781 *
14782 *
14783 * m_type m1_i1 m1_i2 m1_i3
14784 * |------------+----------+----------+----------
14785 * | SYS_MEM | mem base | mem size | tot mem |
14786 * ----------------------------------------------
14787 *
14788 * In addition to the main sys_task() entry point, there are 5 other minor
14789 * entry points:
14790 * cause_sig: take action to cause a signal to occur, sooner or later
14791 * inform: tell MM about pending signals
14792 * numap: umap D segment starting from process number instead of pointer
14793 * umap: compute the physical address for a given virtual address
14794 * alloc_segments: allocate segments for 8088 or higher processor
14795 */
14796
14797 #include "kernel.h"
14798 #include <signal.h>
14799 #include <unistd.h>
14800 #include <sys/sigcontext.h>
14801 #include <sys/ptrace.h>
14802 #include <minix/boot.h>
14803 #include <minix/callnr.h>
14804 #include <minix/com.h>
14805 #include "proc.h"
14806 #include "protect.h"
14807
14808 /* PSW masks. */
14809 #define IF_MASK 0x00000200
14810 #define IOPL_MASK 0x003000
14811
14812 PRIVATE message m;
14813
14814 FORWARD _PROTOTYPE( int do_abort, (message *m_ptr) );
.Ep 206 src/kernel/system.c
14815 FORWARD _PROTOTYPE( int do_copy, (message *m_ptr) );
14816 FORWARD _PROTOTYPE( int do_exec, (message *m_ptr) );
14817 FORWARD _PROTOTYPE( int do_fork, (message *m_ptr) );
14818 FORWARD _PROTOTYPE( int do_gboot, (message *m_ptr) );
14819 FORWARD _PROTOTYPE( int do_getsp, (message *m_ptr) );
14820 FORWARD _PROTOTYPE( int do_kill, (message *m_ptr) );
14821 FORWARD _PROTOTYPE( int do_mem, (message *m_ptr) );
14822 FORWARD _PROTOTYPE( int do_newmap, (message *m_ptr) );
14823 FORWARD _PROTOTYPE( int do_sendsig, (message *m_ptr) );
14824 FORWARD _PROTOTYPE( int do_sigreturn, (message *m_ptr) );
14825 FORWARD _PROTOTYPE( int do_endsig, (message *m_ptr) );
14826 FORWARD _PROTOTYPE( int do_times, (message *m_ptr) );
14827 FORWARD _PROTOTYPE( int do_trace, (message *m_ptr) );
14828 FORWARD _PROTOTYPE( int do_umap, (message *m_ptr) );
14829 FORWARD _PROTOTYPE( int do_xit, (message *m_ptr) );
14830 FORWARD _PROTOTYPE( int do_vcopy, (message *m_ptr) );
14831 FORWARD _PROTOTYPE( int do_getmap, (message *m_ptr) );
14832
14833
14834 /*===========================================================================*
14835 * sys_task *
14836 *===========================================================================*/
14837 PUBLIC void sys_task()
14838 {
14839 /* Main entry point of sys_task. Get the message and dispatch on type. */
14840
14841 register int r;
14842
14843 while (TRUE) {
14844 receive(ANY, &m);
14845
14846 switch (m.m_type) { /* which system call */
14847 case SYS_FORK: r = do_fork(&m); break;
14848 case SYS_NEWMAP: r = do_newmap(&m); break;
14849 case SYS_GETMAP: r = do_getmap(&m); break;
14850 case SYS_EXEC: r = do_exec(&m); break;
14851 case SYS_XIT: r = do_xit(&m); break;
14852 case SYS_GETSP: r = do_getsp(&m); break;
14853 case SYS_TIMES: r = do_times(&m); break;
14854 case SYS_ABORT: r = do_abort(&m); break;
14855 case SYS_SENDSIG: r = do_sendsig(&m); break;
14856 case SYS_SIGRETURN: r = do_sigreturn(&m); break;
14857 case SYS_KILL: r = do_kill(&m); break;
14858 case SYS_ENDSIG: r = do_endsig(&m); break;
14859 case SYS_COPY: r = do_copy(&m); break;
14860 case SYS_VCOPY: r = do_vcopy(&m); break;
14861 case SYS_GBOOT: r = do_gboot(&m); break;
14862 case SYS_MEM: r = do_mem(&m); break;
14863 case SYS_UMAP: r = do_umap(&m); break;
14864 case SYS_TRACE: r = do_trace(&m); break;
14865 default: r = E_BAD_FCN;
14866 }
14867
14868 m.m_type = r; /* 'r' reports status of call */
14869 send(m.m_source, &m); /* send reply to caller */
14870 }
14871 }
14874 /*===========================================================================*
.Op 207 src/kernel/system.c
14875 * do_fork *
14876 *===========================================================================*/
14877 PRIVATE int do_fork(m_ptr)
14878 register message *m_ptr; /* pointer to request message */
14879 {
14880 /* Handle sys_fork(). m_ptr->PROC1 has forked. The child is m_ptr->PROC2. */
14881
14882 reg_t old_ldt_sel;
14883 register struct proc *rpc;
14884 struct proc *rpp;
14885
14886 if (!isoksusern(m_ptr->PROC1) || !isoksusern(m_ptr->PROC2))
14887 return(E_BAD_PROC);
14888 rpp = proc_addr(m_ptr->PROC1);
14889 rpc = proc_addr(m_ptr->PROC2);
14890
14891 /* Copy parent 'proc' struct to child. */
14892 old_ldt_sel = rpc->p_ldt_sel; /* stop this being obliterated by copy */
14893
14894 *rpc = *rpp; /* copy 'proc' struct */
14895
14896 rpc->p_ldt_sel = old_ldt_sel;
14897 rpc->p_nr = m_ptr->PROC2; /* this was obliterated by copy */
14898
14899 rpc->p_flags |= NO_MAP; /* inhibit the process from running */
14900
14901 rpc->p_flags &= ~(PENDING | SIG_PENDING | P_STOP);
14902
14903 /* Only 1 in group should have PENDING, child does not inherit trace status*/
14904 sigemptyset(&rpc->p_pending);
14905 rpc->p_pendcount = 0;
14906 rpc->p_pid = m_ptr->PID; /* install child's pid */
14907 rpc->p_reg.retreg = 0; /* child sees pid = 0 to know it is child */
14908
14909 rpc->user_time = 0; /* set all the accounting times to 0 */
14910 rpc->sys_time = 0;
14911 rpc->child_utime = 0;
14912 rpc->child_stime = 0;
14913
14914 return(OK);
14915 }
14918 /*===========================================================================*
14919 * do_newmap *
14920 *===========================================================================*/
14921 PRIVATE int do_newmap(m_ptr)
14922 message *m_ptr; /* pointer to request message */
14923 {
14924 /* Handle sys_newmap(). Fetch the memory map from MM. */
14925
14926 register struct proc *rp;
14927 phys_bytes src_phys;
14928 int caller; /* whose space has the new map (usually MM) */
14929 int k; /* process whose map is to be loaded */
14930 int old_flags; /* value of flags before modification */
14931 struct mem_map *map_ptr; /* virtual address of map inside caller (MM) */
14932
14933 /* Extract message parameters and copy new memory map from MM. */
14934 caller = m_ptr->m_source;
.Ep 208 src/kernel/system.c
14935 k = m_ptr->PROC1;
14936 map_ptr = (struct mem_map *) m_ptr->MEM_PTR;
14937 if (!isokprocn(k)) return(E_BAD_PROC);
14938 rp = proc_addr(k); /* ptr to entry of user getting new map */
14939
14940 /* Copy the map from MM. */
14941 src_phys = umap(proc_addr(caller), D, (vir_bytes) map_ptr, sizeof(rp->p_map));
14942 if (src_phys == 0) panic("bad call to sys_newmap", NO_NUM);
14943 phys_copy(src_phys, vir2phys(rp->p_map), (phys_bytes) sizeof(rp->p_map));
14944
14945 alloc_segments(rp);
14946 old_flags = rp->p_flags; /* save the previous value of the flags */
14947 rp->p_flags &= ~NO_MAP;
14948 if (old_flags != 0 && rp->p_flags == 0) lock_ready(rp);
14949
14950 return(OK);
14951 }
14954 /*===========================================================================*
14955 * do_getmap *
14956 *===========================================================================*/
14957 PRIVATE int do_getmap(m_ptr)
14958 message *m_ptr; /* pointer to request message */
14959 {
14960 /* Handle sys_getmap(). Report the memory map to MM. */
14961
14962 register struct proc *rp;
14963 phys_bytes dst_phys;
14964 int caller; /* where the map has to be stored */
14965 int k; /* process whose map is to be loaded */
14966 struct mem_map *map_ptr; /* virtual address of map inside caller (MM) */
14967
14968 /* Extract message parameters and copy new memory map to MM. */
14969 caller = m_ptr->m_source;
14970 k = m_ptr->PROC1;
14971 map_ptr = (struct mem_map *) m_ptr->MEM_PTR;
14972
14973 if (!isokprocn(k))
14974 panic("do_getmap got bad proc: ", m_ptr->PROC1);
14975
14976 rp = proc_addr(k); /* ptr to entry of the map */
14977
14978 /* Copy the map to MM. */
14979 dst_phys = umap(proc_addr(caller), D, (vir_bytes) map_ptr, sizeof(rp->p_map));
14980 if (dst_phys == 0) panic("bad call to sys_getmap", NO_NUM);
14981 phys_copy(vir2phys(rp->p_map), dst_phys, sizeof(rp->p_map));
14982
14983 return(OK);
14984 }
14987 /*===========================================================================*
14988 * do_exec *
14989 *===========================================================================*/
14990 PRIVATE int do_exec(m_ptr)
14991 register message *m_ptr; /* pointer to request message */
14992 {
14993 /* Handle sys_exec(). A process has done a successful EXEC. Patch it up. */
14994
.Op 209 src/kernel/system.c
14995 register struct proc *rp;
14996 reg_t sp; /* new sp */
14997 phys_bytes phys_name;
14998 char *np;
14999 #define NLEN (sizeof(rp->p_name)-1)
15000
15001 if (!isoksusern(m_ptr->PROC1)) return E_BAD_PROC;
15002 /* PROC2 field is used as flag to indicate process is being traced */
15003 if (m_ptr->PROC2) cause_sig(m_ptr->PROC1, SIGTRAP);
15004 sp = (reg_t) m_ptr->STACK_PTR;
15005 rp = proc_addr(m_ptr->PROC1);
15006 rp->p_reg.sp = sp; /* set the stack pointer */
15007 rp->p_reg.pc = (reg_t) m_ptr->IP_PTR; /* set pc */
15008 rp->p_alarm = 0; /* reset alarm timer */
15009 rp->p_flags &= ~RECEIVING; /* MM does not reply to EXEC call */
15010 if (rp->p_flags == 0) lock_ready(rp);
15011
15012 /* Save command name for debugging, ps(1) output, etc. */
15013 phys_name = numap(m_ptr->m_source, (vir_bytes) m_ptr->NAME_PTR,
15014 (vir_bytes) NLEN);
15015 if (phys_name != 0) {
15016 phys_copy(phys_name, vir2phys(rp->p_name), (phys_bytes) NLEN);
15017 for (np = rp->p_name; (*np & BYTE) >= ' '; np++) {}
15018 *np = 0;
15019 }
15020 return(OK);
15021 }
15024 /*===========================================================================*
15025 * do_xit *
15026 *===========================================================================*/
15027 PRIVATE int do_xit(m_ptr)
15028 message *m_ptr; /* pointer to request message */
15029 {
15030 /* Handle sys_xit(). A process has exited. */
15031
15032 register struct proc *rp, *rc;
15033 struct proc *np, *xp;
15034 int parent; /* number of exiting proc's parent */
15035 int proc_nr; /* number of process doing the exit */
15036 phys_clicks base, size;
15037
15038 parent = m_ptr->PROC1; /* slot number of parent process */
15039 proc_nr = m_ptr->PROC2; /* slot number of exiting process */
15040 if (!isoksusern(parent) || !isoksusern(proc_nr)) return(E_BAD_PROC);
15041 rp = proc_addr(parent);
15042 rc = proc_addr(proc_nr);
15043 lock();
15044 rp->child_utime += rc->user_time + rc->child_utime; /* accum child times */
15045 rp->child_stime += rc->sys_time + rc->child_stime;
15046 unlock();
15047 rc->p_alarm = 0; /* turn off alarm timer */
15048 if (rc->p_flags == 0) lock_unready(rc);
15049
15050 strcpy(rc->p_name, "<noname>"); /* process no longer has a name */
15051
15052 /* If the process being terminated happens to be queued trying to send a
15053 * message (i.e., the process was killed by a signal, rather than it doing an
15054 * EXIT), then it must be removed from the message queues.
.Ep 210 src/kernel/system.c
15055 */
15056 if (rc->p_flags & SENDING) {
15057 /* Check all proc slots to see if the exiting process is queued. */
15058 for (rp = BEG_PROC_ADDR; rp < END_PROC_ADDR; rp++) {
15059 if (rp->p_callerq == NIL_PROC) continue;
15060 if (rp->p_callerq == rc) {
15061 /* Exiting process is on front of this queue. */
15062 rp->p_callerq = rc->p_sendlink;
15063 break;
15064 } else {
15065 /* See if exiting process is in middle of queue. */
15066 np = rp->p_callerq;
15067 while ( ( xp = np->p_sendlink) != NIL_PROC)
15068 if (xp == rc) {
15069 np->p_sendlink = xp->p_sendlink;
15070 break;
15071 } else {
15072 np = xp;
15073 }
15074 }
15075 }
15076 }
15077
15078 if (rc->p_flags & PENDING) --sig_procs;
15079 sigemptyset(&rc->p_pending);
15080 rc->p_pendcount = 0;
15081 rc->p_flags = P_SLOT_FREE;
15082 return(OK);
15083 }
15086 /*===========================================================================*
15087 * do_getsp *
15088 *===========================================================================*/
15089 PRIVATE int do_getsp(m_ptr)
15090 register message *m_ptr; /* pointer to request message */
15091 {
15092 /* Handle sys_getsp(). MM wants to know what sp is. */
15093
15094 register struct proc *rp;
15095
15096 if (!isoksusern(m_ptr->PROC1)) return(E_BAD_PROC);
15097 rp = proc_addr(m_ptr->PROC1);
15098 m_ptr->STACK_PTR = (char *) rp->p_reg.sp; /* return sp here (bad type) */
15099 return(OK);
15100 }
15103 /*===========================================================================*
15104 * do_times *
15105 *===========================================================================*/
15106 PRIVATE int do_times(m_ptr)
15107 register message *m_ptr; /* pointer to request message */
15108 {
15109 /* Handle sys_times(). Retrieve the accounting information. */
15110
15111 register struct proc *rp;
15112
15113 if (!isoksusern(m_ptr->PROC1)) return E_BAD_PROC;
15114 rp = proc_addr(m_ptr->PROC1);
.Op 211 src/kernel/system.c
15115
15116 /* Insert the times needed by the TIMES system call in the message. */
15117 lock(); /* halt the volatile time counters in rp */
15118 m_ptr->USER_TIME = rp->user_time;
15119 m_ptr->SYSTEM_TIME = rp->sys_time;
15120 unlock();
15121 m_ptr->CHILD_UTIME = rp->child_utime;
15122 m_ptr->CHILD_STIME = rp->child_stime;
15123 m_ptr->BOOT_TICKS = get_uptime();
15124 return(OK);
15125 }
15128 /*===========================================================================*
15129 * do_abort *
15130 *===========================================================================*/
15131 PRIVATE int do_abort(m_ptr)
15132 message *m_ptr; /* pointer to request message */
15133 {
15134 /* Handle sys_abort. MINIX is unable to continue. Terminate operation. */
15135 char monitor_code[64];
15136 phys_bytes src_phys;
15137
15138 if (m_ptr->m1_i1 == RBT_MONITOR) {
15139 /* The monitor is to run user specified instructions. */
15140 src_phys = numap(m_ptr->m_source, (vir_bytes) m_ptr->m1_p1,
15141 (vir_bytes) sizeof(monitor_code));
15142 if (src_phys == 0) panic("bad monitor code from", m_ptr->m_source);
15143 phys_copy(src_phys, vir2phys(monitor_code),
15144 (phys_bytes) sizeof(monitor_code));
15145 reboot_code = vir2phys(monitor_code);
15146 }
15147 wreboot(m_ptr->m1_i1);
15148 return(OK); /* pro-forma (really EDISASTER) */
15149 }
15154 /*===========================================================================*
15155 * do_sendsig *
15156 *===========================================================================*/
15157 PRIVATE int do_sendsig(m_ptr)
15158 message *m_ptr; /* pointer to request message */
15159 {
15160 /* Handle sys_sendsig, POSIX-style signal */
15161
15162 struct sigmsg smsg;
15163 register struct proc *rp;
15164 phys_bytes src_phys, dst_phys;
15165 struct sigcontext sc, *scp;
15166 struct sigframe fr, *frp;
15167
15168 if (!isokusern(m_ptr->PROC1)) return(E_BAD_PROC);
15169 rp = proc_addr(m_ptr->PROC1);
15170
15171 /* Get the sigmsg structure into our address space. */
15172 src_phys = umap(proc_addr(MM_PROC_NR), D, (vir_bytes) m_ptr->SIG_CTXT_PTR,
15173 (vir_bytes) sizeof(struct sigmsg));
15174 if (src_phys == 0)
.Ep 212 src/kernel/system.c
15175 panic("do_sendsig can't signal: bad sigmsg address from MM", NO_NUM);
15176 phys_copy(src_phys, vir2phys(&smsg), (phys_bytes) sizeof(struct sigmsg));
15177
15178 /* Compute the usr stack pointer value where sigcontext will be stored. */
15179 scp = (struct sigcontext *) smsg.sm_stkptr - 1;
15180
15181 /* Copy the registers to the sigcontext structure. */
15182 memcpy(&sc.sc_regs, &rp->p_reg, sizeof(struct sigregs));
15183
15184 /* Finish the sigcontext initialization. */
15185 sc.sc_flags = SC_SIGCONTEXT;
15186
15187 sc.sc_mask = smsg.sm_mask;
15188
15189 /* Copy the sigcontext structure to the user's stack. */
15190 dst_phys = umap(rp, D, (vir_bytes) scp,
15191 (vir_bytes) sizeof(struct sigcontext));
15192 if (dst_phys == 0) return(EFAULT);
15193 phys_copy(vir2phys(&sc), dst_phys, (phys_bytes) sizeof(struct sigcontext));
15194
15195 /* Initialize the sigframe structure. */
15196 frp = (struct sigframe *) scp - 1;
15197 fr.sf_scpcopy = scp;
15198 fr.sf_retadr2= (void (*)()) rp->p_reg.pc;
15199 fr.sf_fp = rp->p_reg.fp;
15200 rp->p_reg.fp = (reg_t) &frp->sf_fp;
15201 fr.sf_scp = scp;
15202 fr.sf_code = 0; /* XXX - should be used for type of FP exception */
15203 fr.sf_signo = smsg.sm_signo;
15204 fr.sf_retadr = (void (*)()) smsg.sm_sigreturn;
15205
15206 /* Copy the sigframe structure to the user's stack. */
15207 dst_phys = umap(rp, D, (vir_bytes) frp, (vir_bytes) sizeof(struct sigframe));
15208 if (dst_phys == 0) return(EFAULT);
15209 phys_copy(vir2phys(&fr), dst_phys, (phys_bytes) sizeof(struct sigframe));
15210
15211 /* Reset user registers to execute the signal handler. */
15212 rp->p_reg.sp = (reg_t) frp;
15213 rp->p_reg.pc = (reg_t) smsg.sm_sighandler;
15214
15215 return(OK);
15216 }
15218 /*===========================================================================*
15219 * do_sigreturn *
15220 *===========================================================================*/
15221 PRIVATE int do_sigreturn(m_ptr)
15222 register message *m_ptr;
15223 {
15224 /* POSIX style signals require sys_sigreturn to put things in order before the
15225 * signalled process can resume execution
15226 */
15227
15228 struct sigcontext sc;
15229 register struct proc *rp;
15230 phys_bytes src_phys;
15231
15232 if (!isokusern(m_ptr->PROC1)) return(E_BAD_PROC);
15233 rp = proc_addr(m_ptr->PROC1);
15234
.Op 213 src/kernel/system.c
15235 /* Copy in the sigcontext structure. */
15236 src_phys = umap(rp, D, (vir_bytes) m_ptr->SIG_CTXT_PTR,
15237 (vir_bytes) sizeof(struct sigcontext));
15238 if (src_phys == 0) return(EFAULT);
15239 phys_copy(src_phys, vir2phys(&sc), (phys_bytes) sizeof(struct sigcontext));
15240
15241 /* Make sure that this is not just a jmp_buf. */
15242 if ((sc.sc_flags & SC_SIGCONTEXT) == 0) return(EINVAL);
15243
15244 /* Fix up only certain key registers if the compiler doesn't use
15245 * register variables within functions containing setjmp.
15246 */
15247 if (sc.sc_flags & SC_NOREGLOCALS) {
15248 rp->p_reg.retreg = sc.sc_retreg;
15249 rp->p_reg.fp = sc.sc_fp;
15250 rp->p_reg.pc = sc.sc_pc;
15251 rp->p_reg.sp = sc.sc_sp;
15252 return (OK);
15253 }
15254 sc.sc_psw = rp->p_reg.psw;
15255
15256 #if (CHIP == INTEL)
15257 /* Don't panic kernel if user gave bad selectors. */
15258 sc.sc_cs = rp->p_reg.cs;
15259 sc.sc_ds = rp->p_reg.ds;
15260 sc.sc_es = rp->p_reg.es;
15261 #if _WORD_SIZE == 4
15262 sc.sc_fs = rp->p_reg.fs;
15263 sc.sc_gs = rp->p_reg.gs;
15264 #endif
15265 #endif
15266
15267 /* Restore the registers. */
15268 memcpy(&rp->p_reg, (char *)&sc.sc_regs, sizeof(struct sigregs));
15269
15270 return(OK);
15271 }
15273 /*===========================================================================*
15274 * do_kill *
15275 *===========================================================================*/
15276 PRIVATE int do_kill(m_ptr)
15277 register message *m_ptr; /* pointer to request message */
15278 {
15279 /* Handle sys_kill(). Cause a signal to be sent to a process via MM.
15280 * Note that this has nothing to do with the kill (2) system call, this
15281 * is how the FS (and possibly other servers) get access to cause_sig to
15282 * send a KSIG message to MM
15283 */
15284
15285 if (!isokusern(m_ptr->PR)) return(E_BAD_PROC);
15286 cause_sig(m_ptr->PR, m_ptr->SIGNUM);
15287 return(OK);
15288 }
15291 /*===========================================================================*
15292 * do_endsig *
15293 *===========================================================================*/
15294 PRIVATE int do_endsig(m_ptr)
.Ep 214 src/kernel/system.c
15295 register message *m_ptr; /* pointer to request message */
15296 {
15297 /* Finish up after a KSIG-type signal, caused by a SYS_KILL message or a call
15298 * to cause_sig by a task
15299 */
15300
15301 register struct proc *rp;
15302
15303 if (!isokusern(m_ptr->PROC1)) return(E_BAD_PROC);
15304 rp = proc_addr(m_ptr->PROC1);
15305
15306 /* MM has finished one KSIG. */
15307 if (rp->p_pendcount != 0 && --rp->p_pendcount == 0
15308 && (rp->p_flags &= ~SIG_PENDING) == 0)
15309 lock_ready(rp);
15310 return(OK);
15311 }
15313 /*===========================================================================*
15314 * do_copy *
15315 *===========================================================================*/
15316 PRIVATE int do_copy(m_ptr)
15317 register message *m_ptr; /* pointer to request message */
15318 {
15319 /* Handle sys_copy(). Copy data for MM or FS. */
15320
15321 int src_proc, dst_proc, src_space, dst_space;
15322 vir_bytes src_vir, dst_vir;
15323 phys_bytes src_phys, dst_phys, bytes;
15324
15325 /* Dismember the command message. */
15326 src_proc = m_ptr->SRC_PROC_NR;
15327 dst_proc = m_ptr->DST_PROC_NR;
15328 src_space = m_ptr->SRC_SPACE;
15329 dst_space = m_ptr->DST_SPACE;
15330 src_vir = (vir_bytes) m_ptr->SRC_BUFFER;
15331 dst_vir = (vir_bytes) m_ptr->DST_BUFFER;
15332 bytes = (phys_bytes) m_ptr->COPY_BYTES;
15333
15334 /* Compute the source and destination addresses and do the copy. */
15335 if (src_proc == ABS)
15336 src_phys = (phys_bytes) m_ptr->SRC_BUFFER;
15337 else {
15338 if (bytes != (vir_bytes) bytes)
15339 /* This would happen for 64K segments and 16-bit vir_bytes.
15340 * It would happen a lot for do_fork except MM uses ABS
15341 * copies for that case.
15342 */
15343 panic("overflow in count in do_copy", NO_NUM);
15344
15345 src_phys = umap(proc_addr(src_proc), src_space, src_vir,
15346 (vir_bytes) bytes);
15347 }
15348
15349 if (dst_proc == ABS)
15350 dst_phys = (phys_bytes) m_ptr->DST_BUFFER;
15351 else
15352 dst_phys = umap(proc_addr(dst_proc), dst_space, dst_vir,
15353 (vir_bytes) bytes);
15354
.Op 215 src/kernel/system.c
15355 if (src_phys == 0 || dst_phys == 0) return(EFAULT);
15356 phys_copy(src_phys, dst_phys, bytes);
15357 return(OK);
15358 }
15361 /*===========================================================================*
15362 * do_vcopy *
15363 *===========================================================================*/
15364 PRIVATE int do_vcopy(m_ptr)
15365 register message *m_ptr; /* pointer to request message */
15366 {
15367 /* Handle sys_vcopy(). Copy multiple blocks of memory */
15368
15369 int src_proc, dst_proc, vect_s, i;
15370 vir_bytes src_vir, dst_vir, vect_addr;
15371 phys_bytes src_phys, dst_phys, bytes;
15372 cpvec_t cpvec_table[CPVEC_NR];
15373
15374 /* Dismember the command message. */
15375 src_proc = m_ptr->m1_i1;
15376 dst_proc = m_ptr->m1_i2;
15377 vect_s = m_ptr->m1_i3;
15378 vect_addr = (vir_bytes)m_ptr->m1_p1;
15379
15380 if (vect_s > CPVEC_NR) return EDOM;
15381
15382 src_phys= numap (m_ptr->m_source, vect_addr, vect_s * sizeof(cpvec_t));
15383 if (!src_phys) return EFAULT;
15384 phys_copy(src_phys, vir2phys(cpvec_table),
15385 (phys_bytes) (vect_s * sizeof(cpvec_t)));
15386
15387 for (i = 0; i < vect_s; i++) {
15388 src_vir= cpvec_table[i].cpv_src;
15389 dst_vir= cpvec_table[i].cpv_dst;
15390 bytes= cpvec_table[i].cpv_size;
15391 src_phys = numap(src_proc,src_vir,(vir_bytes)bytes);
15392 dst_phys = numap(dst_proc,dst_vir,(vir_bytes)bytes);
15393 if (src_phys == 0 || dst_phys == 0) return(EFAULT);
15394 phys_copy(src_phys, dst_phys, bytes);
15395 }
15396 return(OK);
15397 }
15400 /*==========================================================================*
15401 * do_gboot *
15402 *==========================================================================*/
15403 PUBLIC struct bparam_s boot_parameters;
15404
15405 PRIVATE int do_gboot(m_ptr)
15406 message *m_ptr; /* pointer to request message */
15407 {
15408 /* Copy the boot parameters. Normally only called during fs init. */
15409
15410 phys_bytes dst_phys;
15411
15412 dst_phys = umap(proc_addr(m_ptr->PROC1), D, (vir_bytes) m_ptr->MEM_PTR,
15413 (vir_bytes) sizeof(boot_parameters));
15414 if (dst_phys == 0) panic("bad call to SYS_GBOOT", NO_NUM);
.Ep 216 src/kernel/system.c
15415 phys_copy(vir2phys(&boot_parameters), dst_phys,
15416 (phys_bytes) sizeof(boot_parameters));
15417 return(OK);
15418 }
15421 /*===========================================================================*
15422 * do_mem *
15423 *===========================================================================*/
15424 PRIVATE int do_mem(m_ptr)
15425 register message *m_ptr; /* pointer to request message */
15426 {
15427 /* Return the base and size of the next chunk of memory. */
15428
15429 struct memory *memp;
15430
15431 for (memp = mem; memp < &mem[NR_MEMS]; ++memp) {
15432 m_ptr->m1_i1 = memp->base;
15433 m_ptr->m1_i2 = memp->size;
15434 m_ptr->m1_i3 = tot_mem_size;
15435 memp->size = 0;
15436 if (m_ptr->m1_i2 != 0) break; /* found a chunk */
15437 }
15438 return(OK);
15439 }
15442 /*==========================================================================*
15443 * do_umap *
15444 *==========================================================================*/
15445 PRIVATE int do_umap(m_ptr)
15446 register message *m_ptr; /* pointer to request message */
15447 {
15448 /* Same as umap(), for non-kernel processes. */
15449
15450 m_ptr->SRC_BUFFER = umap(proc_addr((int) m_ptr->SRC_PROC_NR),
15451 (int) m_ptr->SRC_SPACE,
15452 (vir_bytes) m_ptr->SRC_BUFFER,
15453 (vir_bytes) m_ptr->COPY_BYTES);
15454 return(OK);
15455 }
15458 /*==========================================================================*
15459 * do_trace *
15460 *==========================================================================*/
15461 #define TR_PROCNR (m_ptr->m2_i1)
15462 #define TR_REQUEST (m_ptr->m2_i2)
15463 #define TR_ADDR ((vir_bytes) m_ptr->m2_l1)
15464 #define TR_DATA (m_ptr->m2_l2)
15465 #define TR_VLSIZE ((vir_bytes) sizeof(long))
15466
15467 PRIVATE int do_trace(m_ptr)
15468 register message *m_ptr;
15469 {
15470 /* Handle the debugging commands supported by the ptrace system call
15471 * The commands are:
15472 * T_STOP stop the process
15473 * T_OK enable tracing by parent for this process
15474 * T_GETINS return value from instruction space
.Op 217 src/kernel/system.c
15475 * T_GETDATA return value from data space
15476 * T_GETUSER return value from user process table
15477 * T_SETINS set value from instruction space
15478 * T_SETDATA set value from data space
15479 * T_SETUSER set value in user process table
15480 * T_RESUME resume execution
15481 * T_EXIT exit
15482 * T_STEP set trace bit
15483 *
15484 * The T_OK and T_EXIT commands are handled completely by the memory manager,
15485 * all others come here.
15486 */
15487
15488 register struct proc *rp;
15489 phys_bytes src, dst;
15490 int i;
15491
15492 rp = proc_addr(TR_PROCNR);
15493 if (rp->p_flags & P_SLOT_FREE) return(EIO);
15494 switch (TR_REQUEST) {
15495 case T_STOP: /* stop process */
15496 if (rp->p_flags == 0) lock_unready(rp);
15497 rp->p_flags |= P_STOP;
15498 rp->p_reg.psw &= ~TRACEBIT; /* clear trace bit */
15499 return(OK);
15500
15501 case T_GETINS: /* return value from instruction space */
15502 if (rp->p_map[T].mem_len != 0) {
15503 if ((src = umap(rp, T, TR_ADDR, TR_VLSIZE)) == 0) return(EIO);
15504 phys_copy(src, vir2phys(&TR_DATA), (phys_bytes) sizeof(long));
15505 break;
15506 }
15507 /* Text space is actually data space - fall through. */
15508
15509 case T_GETDATA: /* return value from data space */
15510 if ((src = umap(rp, D, TR_ADDR, TR_VLSIZE)) == 0) return(EIO);
15511 phys_copy(src, vir2phys(&TR_DATA), (phys_bytes) sizeof(long));
15512 break;
15513
15514 case T_GETUSER: /* return value from process table */
15515 if ((TR_ADDR & (sizeof(long) - 1)) != 0 ||
15516 TR_ADDR > sizeof(struct proc) - sizeof(long))
15517 return(EIO);
15518 TR_DATA = *(long *) ((char *) rp + (int) TR_ADDR);
15519 break;
15520
15521 case T_SETINS: /* set value in instruction space */
15522 if (rp->p_map[T].mem_len != 0) {
15523 if ((dst = umap(rp, T, TR_ADDR, TR_VLSIZE)) == 0) return(EIO);
15524 phys_copy(vir2phys(&TR_DATA), dst, (phys_bytes) sizeof(long));
15525 TR_DATA = 0;
15526 break;
15527 }
15528 /* Text space is actually data space - fall through. */
15529
15530 case T_SETDATA: /* set value in data space */
15531 if ((dst = umap(rp, D, TR_ADDR, TR_VLSIZE)) == 0) return(EIO);
15532 phys_copy(vir2phys(&TR_DATA), dst, (phys_bytes) sizeof(long));
15533 TR_DATA = 0;
15534 break;
.Ep 218 src/kernel/system.c
15535
15536 case T_SETUSER: /* set value in process table */
15537 if ((TR_ADDR & (sizeof(reg_t) - 1)) != 0 ||
15538 TR_ADDR > sizeof(struct stackframe_s) - sizeof(reg_t))
15539 return(EIO);
15540 i = (int) TR_ADDR;
15541 #if (CHIP == INTEL)
15542 /* Altering segment registers might crash the kernel when it
15543 * tries to load them prior to restarting a process, so do
15544 * not allow it.
15545 */
15546 if (i == (int) &((struct proc *) 0)->p_reg.cs ||
15547 i == (int) &((struct proc *) 0)->p_reg.ds ||
15548 i == (int) &((struct proc *) 0)->p_reg.es ||
15549 #if _WORD_SIZE == 4
15550 i == (int) &((struct proc *) 0)->p_reg.gs ||
15551 i == (int) &((struct proc *) 0)->p_reg.fs ||
15552 #endif
15553 i == (int) &((struct proc *) 0)->p_reg.ss)
15554 return(EIO);
15555 #endif
15556 if (i == (int) &((struct proc *) 0)->p_reg.psw)
15557 /* only selected bits are changeable */
15558 SETPSW(rp, TR_DATA);
15559 else
15560 *(reg_t *) ((char *) &rp->p_reg + i) = (reg_t) TR_DATA;
15561 TR_DATA = 0;
15562 break;
15563
15564 case T_RESUME: /* resume execution */
15565 rp->p_flags &= ~P_STOP;
15566 if (rp->p_flags == 0) lock_ready(rp);
15567 TR_DATA = 0;
15568 break;
15569
15570 case T_STEP: /* set trace bit */
15571 rp->p_reg.psw |= TRACEBIT;
15572 rp->p_flags &= ~P_STOP;
15573 if (rp->p_flags == 0) lock_ready(rp);
15574 TR_DATA = 0;
15575 break;
15576
15577 default:
15578 return(EIO);
15579 }
15580 return(OK);
15581 }
15583 /*===========================================================================*
15584 * cause_sig *
15585 *===========================================================================*/
15586 PUBLIC void cause_sig(proc_nr, sig_nr)
15587 int proc_nr; /* process to be signalled */
15588 int sig_nr; /* signal to be sent, 1 to _NSIG */
15589 {
15590 /* A task wants to send a signal to a process. Examples of such tasks are:
15591 * TTY wanting to cause SIGINT upon getting a DEL
15592 * CLOCK wanting to cause SIGALRM when timer expires
15593 * FS also uses this to send a signal, via the SYS_KILL message.
15594 * Signals are handled by sending a message to MM. The tasks don't dare do
.Op 219 src/kernel/system.c
15595 * that directly, for fear of what would happen if MM were busy. Instead they
15596 * call cause_sig, which sets bits in p_pending, and then carefully checks to
15597 * see if MM is free. If so, a message is sent to it. If not, when it becomes
15598 * free, a message is sent. The process being signaled is blocked while MM
15599 * has not seen or finished with all signals for it. These signals are
15600 * counted in p_pendcount, and the SIG_PENDING flag is kept nonzero while
15601 * there are some. It is not sufficient to ready the process when MM is
15602 * informed, because MM can block waiting for FS to do a core dump.
15603 */
15604
15605 register struct proc *rp, *mmp;
15606
15607 rp = proc_addr(proc_nr);
15608 if (sigismember(&rp->p_pending, sig_nr))
15609 return; /* this signal already pending */
15610 sigaddset(&rp->p_pending, sig_nr);
15611 ++rp->p_pendcount; /* count new signal pending */
15612 if (rp->p_flags & PENDING)
15613 return; /* another signal already pending */
15614 if (rp->p_flags == 0) lock_unready(rp);
15615 rp->p_flags |= PENDING | SIG_PENDING;
15616 ++sig_procs; /* count new process pending */
15617
15618 mmp = proc_addr(MM_PROC_NR);
15619 if ( ((mmp->p_flags & RECEIVING) == 0) || mmp->p_getfrom != ANY) return;
15620 inform();
15621 }
15624 /*===========================================================================*
15625 * inform *
15626 *===========================================================================*/
15627 PUBLIC void inform()
15628 {
15629 /* When a signal is detected by the kernel (e.g., DEL), or generated by a task
15630 * (e.g. clock task for SIGALRM), cause_sig() is called to set a bit in the
15631 * p_pending field of the process to signal. Then inform() is called to see
15632 * if MM is idle and can be told about it. Whenever MM blocks, a check is
15633 * made to see if 'sig_procs' is nonzero; if so, inform() is called.
15634 */
15635
15636 register struct proc *rp;
15637
15638 /* MM is waiting for new input. Find a process with pending signals. */
15639 for (rp = BEG_SERV_ADDR; rp < END_PROC_ADDR; rp++)
15640 if (rp->p_flags & PENDING) {
15641 m.m_type = KSIG;
15642 m.SIG_PROC = proc_number(rp);
15643 m.SIG_MAP = rp->p_pending;
15644 sig_procs--;
15645 if (lock_mini_send(proc_addr(HARDWARE), MM_PROC_NR, &m) != OK)
15646 panic("can't inform MM", NO_NUM);
15647 sigemptyset(&rp->p_pending); /* the ball is now in MM's court */
15648 rp->p_flags &= ~PENDING;/* remains inhibited by SIG_PENDING */
15649 lock_pick_proc(); /* avoid delay in scheduling MM */
15650 return;
15651 }
15652 }
.Ep 220 src/kernel/system.c
15655 /*===========================================================================*
15656 * umap *
15657 *===========================================================================*/
15658 PUBLIC phys_bytes umap(rp, seg, vir_addr, bytes)
15659 register struct proc *rp; /* pointer to proc table entry for process */
15660 int seg; /* T, D, or S segment */
15661 vir_bytes vir_addr; /* virtual address in bytes within the seg */
15662 vir_bytes bytes; /* # of bytes to be copied */
15663 {
15664 /* Calculate the physical memory address for a given virtual address. */
15665
15666 vir_clicks vc; /* the virtual address in clicks */
15667 phys_bytes pa; /* intermediate variables as phys_bytes */
15668 phys_bytes seg_base;
15669
15670 /* If 'seg' is D it could really be S and vice versa. T really means T.
15671 * If the virtual address falls in the gap, it causes a problem. On the
15672 * 8088 it is probably a legal stack reference, since "stackfaults" are
15673 * not detected by the hardware. On 8088s, the gap is called S and
15674 * accepted, but on other machines it is called D and rejected.
15675 * The Atari ST behaves like the 8088 in this respect.
15676 */
15677
15678 if (bytes <= 0) return( (phys_bytes) 0);
15679 vc = (vir_addr + bytes - 1) >> CLICK_SHIFT; /* last click of data */
15680
15681 if (seg != T)
15682 seg = (vc < rp->p_map[D].mem_vir + rp->p_map[D].mem_len ? D : S);
15683
15684 if((vir_addr>>CLICK_SHIFT) >= rp->p_map[seg].mem_vir+ rp->p_map[seg].mem_len)
15685 return( (phys_bytes) 0 );
15686 seg_base = (phys_bytes) rp->p_map[seg].mem_phys;
15687 seg_base = seg_base << CLICK_SHIFT; /* segment origin in bytes */
15688 pa = (phys_bytes) vir_addr;
15689 pa -= rp->p_map[seg].mem_vir << CLICK_SHIFT;
15690 return(seg_base + pa);
15691 }
15694 /*==========================================================================*
15695 * numap *
15696 *==========================================================================*/
15697 PUBLIC phys_bytes numap(proc_nr, vir_addr, bytes)
15698 int proc_nr; /* process number to be mapped */
15699 vir_bytes vir_addr; /* virtual address in bytes within D seg */
15700 vir_bytes bytes; /* # of bytes required in segment */
15701 {
15702 /* Do umap() starting from a process number instead of a pointer. This
15703 * function is used by device drivers, so they need not know about the
15704 * process table. To save time, there is no 'seg' parameter. The segment
15705 * is always D.
15706 */
15707
15708 return(umap(proc_addr(proc_nr), D, vir_addr, bytes));
15709 }
15711 #if (CHIP == INTEL)
15712 /*==========================================================================*
15713 * alloc_segments *
15714 *==========================================================================*/
.Op 221 src/kernel/system.c
15715 PUBLIC void alloc_segments(rp)
15716 register struct proc *rp;
15717 {
15718 /* This is called only by do_newmap, but is broken out as a separate function
15719 * because so much is hardware-dependent.
15720 */
15721
15722 phys_bytes code_bytes;
15723 phys_bytes data_bytes;
15724 int privilege;
15725
15726 if (protected_mode) {
15727 data_bytes = (phys_bytes) (rp->p_map[S].mem_vir + rp->p_map[S].mem_len)
15728 << CLICK_SHIFT;
15729 if (rp->p_map[T].mem_len == 0)
15730 code_bytes = data_bytes; /* common I&D, poor protect */
15731 else
15732 code_bytes = (phys_bytes) rp->p_map[T].mem_len << CLICK_SHIFT;
15733 privilege = istaskp(rp) ? TASK_PRIVILEGE : USER_PRIVILEGE;
15734 init_codeseg(&rp->p_ldt[CS_LDT_INDEX],
15735 (phys_bytes) rp->p_map[T].mem_phys << CLICK_SHIFT,
15736 code_bytes, privilege);
15737 init_dataseg(&rp->p_ldt[DS_LDT_INDEX],
15738 (phys_bytes) rp->p_map[D].mem_phys << CLICK_SHIFT,
15739 data_bytes, privilege);
15740 rp->p_reg.cs = (CS_LDT_INDEX * DESC_SIZE) | TI | privilege;
15741 #if _WORD_SIZE == 4
15742 rp->p_reg.gs =
15743 rp->p_reg.fs =
15744 #endif
15745 rp->p_reg.ss =
15746 rp->p_reg.es =
15747 rp->p_reg.ds = (DS_LDT_INDEX*DESC_SIZE) | TI | privilege;
15748 } else {
15749 rp->p_reg.cs = click_to_hclick(rp->p_map[T].mem_phys);
15750 rp->p_reg.ss =
15751 rp->p_reg.es =
15752 rp->p_reg.ds = click_to_hclick(rp->p_map[D].mem_phys);
15753 }
15754 }
15755 #endif /* (CHIP == INTEL) */
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/mm.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
15800 /* This is the master header for mm. It includes some other files
15801 * and defines the principal constants.
15802 */
15803 #define _POSIX_SOURCE 1 /* tell headers to include POSIX stuff */
15804 #define _MINIX 1 /* tell headers to include MINIX stuff */
15805 #define _SYSTEM 1 /* tell headers that this is the kernel */
15806
15807 /* The following are so basic, all the *.c files get them automatically. */
15808 #include <minix/config.h> /* MUST be first */
15809 #include <ansi.h> /* MUST be second */
.Ep 222 src/mm/mm.h
15810 #include <sys/types.h>
15811 #include <minix/const.h>
15812 #include <minix/type.h>
15813
15814 #include <fcntl.h>
15815 #include <unistd.h>
15816 #include <minix/syslib.h>
15817
15818 #include <limits.h>
15819 #include <errno.h>
15820
15821 #include "const.h"
15822 #include "type.h"
15823 #include "proto.h"
15824 #include "glo.h"
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/const.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
15900 /* Constants used by the Memory Manager. */
15901
15902 #define NO_MEM ((phys_clicks) 0) /* returned by alloc_mem() with mem is up */
15903
15904 #if (CHIP == INTEL && _WORD_SIZE == 2)
15905 /* These definitions are used in size_ok and are not needed for 386.
15906 * The 386 segment granularity is 1 for segments smaller than 1M and 4096
15907 * above that.
15908 */
15909 #define PAGE_SIZE 16 /* how many bytes in a page (s.b.HCLICK_SIZE)*/
15910 #define MAX_PAGES 4096 /* how many pages in the virtual addr space */
15911 #endif
15912
15913 #define printf printk
15914
15915 #define INIT_PID 1 /* init's process id number */
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/type.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
16000 /* If there were any type definitions local to the Memory Manager, they would
16001 * be here. This file is included only for symmetry with the kernel and File
16002 * System, which do have some local type definitions.
16003 */
16004
.Op 223 src/mm/proto.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/proto.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
16100 /* Function prototypes. */
16101
16102 struct mproc; /* need types outside of parameter list --kub */
16103 struct stat;
16104
16105 /* alloc.c */
16106 _PROTOTYPE( phys_clicks alloc_mem, (phys_clicks clicks) );
16107 _PROTOTYPE( void free_mem, (phys_clicks base, phys_clicks clicks) );
16108 _PROTOTYPE( phys_clicks max_hole, (void) );
16109 _PROTOTYPE( void mem_init, (phys_clicks *total, phys_clicks *free) );
16110 _PROTOTYPE( phys_clicks mem_left, (void) );
16111 _PROTOTYPE( int do_brk3, (void) );
16112
16113 /* break.c */
16114 _PROTOTYPE( int adjust, (struct mproc *rmp,
16115 vir_clicks data_clicks, vir_bytes sp) );
16116 _PROTOTYPE( int do_brk, (void) );
16117 _PROTOTYPE( int size_ok, (int file_type, vir_clicks tc, vir_clicks dc,
16118 vir_clicks sc, vir_clicks dvir, vir_clicks s_vir) );
16119
16120 /* exec.c */
16121 _PROTOTYPE( int do_exec, (void) );
16122 _PROTOTYPE( struct mproc *find_share, (struct mproc *mp_ign, Ino_t ino,
16123 Dev_t dev, time_t ctime) );
16124
16125 /* forkexit.c */
16126 _PROTOTYPE( int do_fork, (void) );
16127 _PROTOTYPE( int do_mm_exit, (void) );
16128 _PROTOTYPE( int do_waitpid, (void) );
16129 _PROTOTYPE( void mm_exit, (struct mproc *rmp, int exit_status) );
16130
16131 /* getset.c */
16132 _PROTOTYPE( int do_getset, (void) );
16133
16134 /* main.c */
16135 _PROTOTYPE( void main, (void) );
16136
16137 #if (MACHINE == MACINTOSH)
16138 _PROTOTYPE( phys_clicks start_click, (void) );
16139 #endif
16140
16141 _PROTOTYPE( void reply, (int proc_nr, int result, int res2, char *respt));
16142
16143 /* putk.c */
16144 _PROTOTYPE( void putk, (int c) );
16145
16146 /* signal.c */
16147 _PROTOTYPE( int do_alarm, (void) );
16148 _PROTOTYPE( int do_kill, (void) );
16149 _PROTOTYPE( int do_ksig, (void) );
16150 _PROTOTYPE( int do_pause, (void) );
16151 _PROTOTYPE( int set_alarm, (int proc_nr, int sec) );
16152 _PROTOTYPE( int check_sig, (pid_t proc_id, int signo) );
16153 _PROTOTYPE( void sig_proc, (struct mproc *rmp, int sig_nr) );
16154 _PROTOTYPE( int do_sigaction, (void) );
.Ep 224 src/mm/proto.h
16155 _PROTOTYPE( int do_sigpending, (void) );
16156 _PROTOTYPE( int do_sigprocmask, (void) );
16157 _PROTOTYPE( int do_sigreturn, (void) );
16158 _PROTOTYPE( int do_sigsuspend, (void) );
16159 _PROTOTYPE( int do_reboot, (void) );
16160
16161 /* trace.c */
16162 _PROTOTYPE( int do_trace, (void) );
16163 _PROTOTYPE( void stop_proc, (struct mproc *rmp, int sig_nr) );
16164
16165 /* utility.c */
16166 _PROTOTYPE( int allowed, (char *name_buf, struct stat *s_buf, int mask) );
16167 _PROTOTYPE( int no_sys, (void) );
16168 _PROTOTYPE( void panic, (char *format, int num) );
16169 _PROTOTYPE( void tell_fs, (int what, int p1, int p2, int p3) );
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/glo.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
16200 /* EXTERN should be extern except in table.c */
16201 #ifdef _TABLE
16202 #undef EXTERN
16203 #define EXTERN
16204 #endif
16205
16206 /* Global variables. */
16207 EXTERN struct mproc *mp; /* ptr to 'mproc' slot of current process */
16208 EXTERN int dont_reply; /* normally 0; set to 1 to inhibit reply */
16209 EXTERN int procs_in_use; /* how many processes are marked as IN_USE */
16210
16211 /* The parameters of the call are kept here. */
16212 EXTERN message mm_in; /* the incoming message itself is kept here. */
16213 EXTERN message mm_out; /* the reply message is built up here. */
16214 EXTERN int who; /* caller's proc number */
16215 EXTERN int mm_call; /* system call number */
16216
16217 /* The following variables are used for returning results to the caller. */
16218 EXTERN int err_code; /* temporary storage for error number */
16219 EXTERN int result2; /* secondary result */
16220 EXTERN char *res_ptr; /* result, if pointer */
16221
16222 extern _PROTOTYPE (int (*call_vec[]), (void) ); /* system call handlers */
16223 extern char core_name[]; /* file name where core images are produced */
16224 EXTERN sigset_t core_sset; /* which signals cause core images */
.Op 225 src/mm/mproc.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/mproc.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
16300 /* This table has one slot per process. It contains all the memory management
16301 * information for each process. Among other things, it defines the text, data
16302 * and stack segments, uids and gids, and various flags. The kernel and file
16303 * systems have tables that are also indexed by process, with the contents
16304 * of corresponding slots referring to the same process in all three.
16305 */
16306
16307 EXTERN struct mproc {
16308 struct mem_map mp_seg[NR_SEGS];/* points to text, data, stack */
16309 char mp_exitstatus; /* storage for status when process exits */
16310 char mp_sigstatus; /* storage for signal # for killed procs */
16311 pid_t mp_pid; /* process id */
16312 pid_t mp_procgrp; /* pid of process group (used for signals) */
16313 pid_t mp_wpid; /* pid this process is waiting for */
16314 int mp_parent; /* index of parent process */
16315
16316 /* Real and effective uids and gids. */
16317 uid_t mp_realuid; /* process' real uid */
16318 uid_t mp_effuid; /* process' effective uid */
16319 gid_t mp_realgid; /* process' real gid */
16320 gid_t mp_effgid; /* process' effective gid */
16321
16322 /* File identification for sharing. */
16323 ino_t mp_ino; /* inode number of file */
16324 dev_t mp_dev; /* device number of file system */
16325 time_t mp_ctime; /* inode changed time */
16326
16327 /* Signal handling information. */
16328 sigset_t mp_ignore; /* 1 means ignore the signal, 0 means don't */
16329 sigset_t mp_catch; /* 1 means catch the signal, 0 means don't */
16330 sigset_t mp_sigmask; /* signals to be blocked */
16331 sigset_t mp_sigmask2; /* saved copy of mp_sigmask */
16332 sigset_t mp_sigpending; /* signals being blocked */
16333 struct sigaction mp_sigact[_NSIG + 1]; /* as in sigaction(2) */
16334 vir_bytes mp_sigreturn; /* address of C library __sigreturn function */
16335
16336 /* Backwards compatibility for signals. */
16337 sighandler_t mp_func; /* all sigs vectored to a single user fcn */
16338
16339 unsigned mp_flags; /* flag bits */
16340 vir_bytes mp_procargs; /* ptr to proc's initial stack arguments */
16341 } mproc[NR_PROCS];
16342
16343 /* Flag values */
16344 #define IN_USE 001 /* set when 'mproc' slot in use */
16345 #define WAITING 002 /* set by WAIT system call */
16346 #define HANGING 004 /* set by EXIT system call */
16347 #define PAUSED 010 /* set by PAUSE system call */
16348 #define ALARM_ON 020 /* set when SIGALRM timer started */
16349 #define SEPARATE 040 /* set if file is separate I & D space */
16350 #define TRACED 0100 /* set if process is to be traced */
16351 #define STOPPED 0200 /* set if process stopped for tracing */
16352 #define SIGSUSPENDED 0400 /* set by SIGSUSPEND system call */
16353
16354 #define NIL_MPROC ((struct mproc *) 0)
.Ep 226 src/mm/param.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/param.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
16400 /* The following names are synonyms for the variables in the input message. */
16401 #define addr mm_in.m1_p1
16402 #define exec_name mm_in.m1_p1
16403 #define exec_len mm_in.m1_i1
16404 #define func mm_in.m6_f1
16405 #define grpid (gid_t) mm_in.m1_i1
16406 #define namelen mm_in.m1_i1
16407 #define pid mm_in.m1_i1
16408 #define seconds mm_in.m1_i1
16409 #define sig mm_in.m6_i1
16410 #define stack_bytes mm_in.m1_i2
16411 #define stack_ptr mm_in.m1_p2
16412 #define status mm_in.m1_i1
16413 #define usr_id (uid_t) mm_in.m1_i1
16414 #define request mm_in.m2_i2
16415 #define taddr mm_in.m2_l1
16416 #define data mm_in.m2_l2
16417 #define sig_nr mm_in.m1_i2
16418 #define sig_nsa mm_in.m1_p1
16419 #define sig_osa mm_in.m1_p2
16420 #define sig_ret mm_in.m1_p3
16421 #define sig_set mm_in.m2_l1
16422 #define sig_how mm_in.m2_i1
16423 #define sig_flags mm_in.m2_i2
16424 #define sig_context mm_in.m2_p1
16425 #ifdef _SIGMESSAGE
16426 #define sig_msg mm_in.m1_i1
16427 #endif
16428 #define reboot_flag mm_in.m1_i1
16429 #define reboot_code mm_in.m1_p1
16430 #define reboot_size mm_in.m1_i2
16431
16432 /* The following names are synonyms for the variables in the output message. */
16433 #define reply_type mm_out.m_type
16434 #define reply_i1 mm_out.m2_i1
16435 #define reply_p1 mm_out.m2_p1
16436 #define ret_mask mm_out.m2_l1
16437
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/table.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
16500 /* This file contains the table used to map system call numbers onto the
16501 * routines that perform them.
16502 */
16503
16504 #define _TABLE
16505
16506 #include "mm.h"
16507 #include <minix/callnr.h>
16508 #include <signal.h>
16509 #include "mproc.h"
.Op 227 src/mm/table.c
16510 #include "param.h"
16511
16512 /* Miscellaneous */
16513 char core_name[] = "core"; /* file name where core images are produced */
16514
16515 _PROTOTYPE (int (*call_vec[NCALLS]), (void) ) = {
16516 no_sys, /* 0 = unused */
16517 do_mm_exit, /* 1 = exit */
16518 do_fork, /* 2 = fork */
16519 no_sys, /* 3 = read */
16520 no_sys, /* 4 = write */
16521 no_sys, /* 5 = open */
16522 no_sys, /* 6 = close */
16523 do_waitpid, /* 7 = wait */
16524 no_sys, /* 8 = creat */
16525 no_sys, /* 9 = link */
16526 no_sys, /* 10 = unlink */
16527 do_waitpid, /* 11 = waitpid */
16528 no_sys, /* 12 = chdir */
16529 no_sys, /* 13 = time */
16530 no_sys, /* 14 = mknod */
16531 no_sys, /* 15 = chmod */
16532 no_sys, /* 16 = chown */
16533 do_brk, /* 17 = break */
16534 no_sys, /* 18 = stat */
16535 no_sys, /* 19 = lseek */
16536 do_getset, /* 20 = getpid */
16537 no_sys, /* 21 = mount */
16538 no_sys, /* 22 = umount */
16539 do_getset, /* 23 = setuid */
16540 do_getset, /* 24 = getuid */
16541 no_sys, /* 25 = stime */
16542 do_trace, /* 26 = ptrace */
16543 do_alarm, /* 27 = alarm */
16544 no_sys, /* 28 = fstat */
16545 do_pause, /* 29 = pause */
16546 no_sys, /* 30 = utime */
16547 no_sys, /* 31 = (stty) */
16548 no_sys, /* 32 = (gtty) */
16549 no_sys, /* 33 = access */
16550 no_sys, /* 34 = (nice) */
16551 no_sys, /* 35 = (ftime) */
16552 no_sys, /* 36 = sync */
16553 do_kill, /* 37 = kill */
16554 no_sys, /* 38 = rename */
16555 no_sys, /* 39 = mkdir */
16556 no_sys, /* 40 = rmdir */
16557 no_sys, /* 41 = dup */
16558 no_sys, /* 42 = pipe */
16559 no_sys, /* 43 = times */
16560 no_sys, /* 44 = (prof) */
16561 no_sys, /* 45 = unused */
16562 do_getset, /* 46 = setgid */
16563 do_getset, /* 47 = getgid */
16564 no_sys, /* 48 = (signal)*/
16565 no_sys, /* 49 = unused */
16566 no_sys, /* 50 = unused */
16567 no_sys, /* 51 = (acct) */
16568 no_sys, /* 52 = (phys) */
16569 no_sys, /* 53 = (lock) */
.Ep 228 src/mm/table.c
16570 no_sys, /* 54 = ioctl */
16571 no_sys, /* 55 = fcntl */
16572 no_sys, /* 56 = (mpx) */
16573 no_sys, /* 57 = unused */
16574 no_sys, /* 58 = unused */
16575 do_exec, /* 59 = execve */
16576 no_sys, /* 60 = umask */
16577 no_sys, /* 61 = chroot */
16578 do_getset, /* 62 = setsid */
16579 do_getset, /* 63 = getpgrp */
16580
16581 do_ksig, /* 64 = KSIG: signals originating in the kernel */
16582 no_sys, /* 65 = UNPAUSE */
16583 no_sys, /* 66 = unused */
16584 no_sys, /* 67 = REVIVE */
16585 no_sys, /* 68 = TASK_REPLY */
16586 no_sys, /* 69 = unused */
16587 no_sys, /* 70 = unused */
16588 do_sigaction, /* 71 = sigaction */
16589 do_sigsuspend, /* 72 = sigsuspend */
16590 do_sigpending, /* 73 = sigpending */
16591 do_sigprocmask, /* 74 = sigprocmask */
16592 do_sigreturn, /* 75 = sigreturn */
16593 do_reboot, /* 76 = reboot */
16594 };
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/main.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
16600 /* This file contains the main program of the memory manager and some related
16601 * procedures. When MINIX starts up, the kernel runs for a little while,
16602 * initializing itself and its tasks, and then it runs MM and FS. Both MM
16603 * and FS initialize themselves as far as they can. FS then makes a call to
16604 * MM, because MM has to wait for FS to acquire a RAM disk. MM asks the
16605 * kernel for all free memory and starts serving requests.
16606 *
16607 * The entry points into this file are:
16608 * main: starts MM running
16609 * reply: reply to a process making an MM system call
16610 */
16611
16612 #include "mm.h"
16613 #include <minix/callnr.h>
16614 #include <minix/com.h>
16615 #include <signal.h>
16616 #include <fcntl.h>
16617 #include <sys/ioctl.h>
16618 #include "mproc.h"
16619 #include "param.h"
16620
16621 FORWARD _PROTOTYPE( void get_work, (void) );
16622 FORWARD _PROTOTYPE( void mm_init, (void) );
16623
16624 /*===========================================================================*
.Op 229 src/mm/main.c
16625 * main *
16626 *===========================================================================*/
16627 PUBLIC void main()
16628 {
16629 /* Main routine of the memory manager. */
16630
16631 int error;
16632
16633 mm_init(); /* initialize memory manager tables */
16634
16635 /* This is MM's main loop- get work and do it, forever and forever. */
16636 while (TRUE) {
16637 /* Wait for message. */
16638 get_work(); /* wait for an MM system call */
16639 mp = &mproc[who];
16640
16641 /* Set some flags. */
16642 error = OK;
16643 dont_reply = FALSE;
16644 err_code = -999;
16645
16646 /* If the call number is valid, perform the call. */
16647 if (mm_call < 0 || mm_call >= NCALLS)
16648 error = EBADCALL;
16649 else
16650 error = (*call_vec[mm_call])();
16651
16652 /* Send the results back to the user to indicate completion. */
16653 if (dont_reply) continue; /* no reply for EXIT and WAIT */
16654 if (mm_call == EXEC && error == OK) continue;
16655 reply(who, error, result2, res_ptr);
16656 }
16657 }
16660 /*===========================================================================*
16661 * get_work *
16662 *===========================================================================*/
16663 PRIVATE void get_work()
16664 {
16665 /* Wait for the next message and extract useful information from it. */
16666
16667 if (receive(ANY, &mm_in) != OK) panic("MM receive error", NO_NUM);
16668 who = mm_in.m_source; /* who sent the message */
16669 mm_call = mm_in.m_type; /* system call number */
16670 }
16673 /*===========================================================================*
16674 * reply *
16675 *===========================================================================*/
16676 PUBLIC void reply(proc_nr, result, res2, respt)
16677 int proc_nr; /* process to reply to */
16678 int result; /* result of the call (usually OK or error #)*/
16679 int res2; /* secondary result */
16680 char *respt; /* result if pointer */
16681 {
16682 /* Send a reply to a user process. */
16683
16684 register struct mproc *proc_ptr;
.Ep 230 src/mm/main.c
16685
16686 proc_ptr = &mproc[proc_nr];
16687 /*
16688 * To make MM robust, check to see if destination is still alive. This
16689 * validy check must be skipped if the caller is a task.
16690 */
16691 if ((who >=0) && ((proc_ptr->mp_flags&IN_USE) == 0 ||
16692 (proc_ptr->mp_flags&HANGING))) return;
16693
16694 reply_type = result;
16695 reply_i1 = res2;
16696 reply_p1 = respt;
16697 if (send(proc_nr, &mm_out) != OK) panic("MM can't reply", NO_NUM);
16698 }
16701 /*===========================================================================*
16702 * mm_init *
16703 *===========================================================================*/
16704 PRIVATE void mm_init()
16705 {
16706 /* Initialize the memory manager. */
16707
16708 static char core_sigs[] = {
16709 SIGQUIT, SIGILL, SIGTRAP, SIGABRT,
16710 SIGEMT, SIGFPE, SIGUSR1, SIGSEGV,
16711 SIGUSR2, 0 };
16712 register int proc_nr;
16713 register struct mproc *rmp;
16714 register char *sig_ptr;
16715 phys_clicks ram_clicks, total_clicks, minix_clicks, free_clicks, dummy;
16716 message mess;
16717 struct mem_map kernel_map[NR_SEGS];
16718 int mem;
16719
16720 /* Build the set of signals which cause core dumps. Do it the Posix
16721 * way, so no knowledge of bit positions is needed.
16722 */
16723 sigemptyset(&core_sset);
16724 for (sig_ptr = core_sigs; *sig_ptr != 0; sig_ptr++)
16725 sigaddset(&core_sset, *sig_ptr);
16726
16727 /* Get the memory map of the kernel to see how much memory it uses,
16728 * including the gap between address 0 and the start of the kernel.
16729 */
16730 sys_getmap(SYSTASK, kernel_map);
16731 minix_clicks = kernel_map[S].mem_phys + kernel_map[S].mem_len;
16732
16733 /* Initialize MM's tables. */
16734 for (proc_nr = 0; proc_nr <= INIT_PROC_NR; proc_nr++) {
16735 rmp = &mproc[proc_nr];
16736 rmp->mp_flags |= IN_USE;
16737 sys_getmap(proc_nr, rmp->mp_seg);
16738 if (rmp->mp_seg[T].mem_len != 0) rmp->mp_flags |= SEPARATE;
16739 minix_clicks += (rmp->mp_seg[S].mem_phys + rmp->mp_seg[S].mem_len)
16740 - rmp->mp_seg[T].mem_phys;
16741 }
16742 mproc[INIT_PROC_NR].mp_pid = INIT_PID;
16743 sigemptyset(&mproc[INIT_PROC_NR].mp_ignore);
16744 sigemptyset(&mproc[INIT_PROC_NR].mp_catch);
.Op 231 src/mm/main.c
16745 procs_in_use = LOW_USER + 1;
16746
16747 /* Wait for FS to send a message telling the RAM disk size then go "on-line".
16748 */
16749 if (receive(FS_PROC_NR, &mess) != OK)
16750 panic("MM can't obtain RAM disk size from FS", NO_NUM);
16751
16752 ram_clicks = mess.m1_i1;
16753
16754 /* Initialize tables to all physical mem. */
16755 mem_init(&total_clicks, &free_clicks);
16756
16757 /* Print memory information. */
16758 printf("nMemory size =%5dK ", click_to_round_k(total_clicks));
16759 printf("MINIX =%4dK ", click_to_round_k(minix_clicks));
16760 printf("RAM disk =%5dK ", click_to_round_k(ram_clicks));
16761 printf("Available =%5dKnn", click_to_round_k(free_clicks));
16762
16763 /* Tell FS to continue. */
16764 if (send(FS_PROC_NR, &mess) != OK)
16765 panic("MM can't sync up with FS", NO_NUM);
16766
16767 /* Tell the memory task where my process table is for the sake of ps(1). */
16768 if ((mem = open("/dev/mem", O_RDWR)) != -1) {
16769 ioctl(mem, MIOCSPSINFO, (void *) mproc);
16770 close(mem);
16771 }
16772 }
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/forkexit.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
16800 /* This file deals with creating processes (via FORK) and deleting them (via
16801 * EXIT/WAIT). When a process forks, a new slot in the 'mproc' table is
16802 * allocated for it, and a copy of the parent's core image is made for the
16803 * child. Then the kernel and file system are informed. A process is removed
16804 * from the 'mproc' table when two events have occurred: (1) it has exited or
16805 * been killed by a signal, and (2) the parent has done a WAIT. If the process
16806 * exits first, it continues to occupy a slot until the parent does a WAIT.
16807 *
16808 * The entry points into this file are:
16809 * do_fork: perform the FORK system call
16810 * do_mm_exit: perform the EXIT system call (by calling mm_exit())
16811 * mm_exit: actually do the exiting
16812 * do_wait: perform the WAITPID or WAIT system call
16813 */
16814
16815
16816 #include "mm.h"
16817 #include <sys/wait.h>
16818 #include <minix/callnr.h>
16819 #include <signal.h>
16820 #include "mproc.h"
16821 #include "param.h"
16822
16823 #define LAST_FEW 2 /* last few slots reserved for superuser */
16824
.Ep 232 src/mm/forkexit.c
16825 PRIVATE pid_t next_pid = INIT_PID+1; /* next pid to be assigned */
16826
16827 FORWARD _PROTOTYPE (void cleanup, (register struct mproc *child) );
16828
16829 /*===========================================================================*
16830 * do_fork *
16831 *===========================================================================*/
16832 PUBLIC int do_fork()
16833 {
16834 /* The process pointed to by 'mp' has forked. Create a child process. */
16835
16836 register struct mproc *rmp; /* pointer to parent */
16837 register struct mproc *rmc; /* pointer to child */
16838 int i, child_nr, t;
16839 phys_clicks prog_clicks, child_base = 0;
16840 phys_bytes prog_bytes, parent_abs, child_abs; /* Intel only */
16841
16842 /* If tables might fill up during FORK, don't even start since recovery half
16843 * way through is such a nuisance.
16844 */
16845 rmp = mp;
16846 if (procs_in_use == NR_PROCS) return(EAGAIN);
16847 if (procs_in_use >= NR_PROCS-LAST_FEW && rmp->mp_effuid != 0)return(EAGAIN);
16848
16849 /* Determine how much memory to allocate. Only the data and stack need to
16850 * be copied, because the text segment is either shared or of zero length.
16851 */
16852 prog_clicks = (phys_clicks) rmp->mp_seg[S].mem_len;
16853 prog_clicks += (rmp->mp_seg[S].mem_vir - rmp->mp_seg[D].mem_vir);
16854 prog_bytes = (phys_bytes) prog_clicks << CLICK_SHIFT;
16855 if ( (child_base = alloc_mem(prog_clicks)) == NO_MEM) return(EAGAIN);
16856
16857 /* Create a copy of the parent's core image for the child. */
16858 child_abs = (phys_bytes) child_base << CLICK_SHIFT;
16859 parent_abs = (phys_bytes) rmp->mp_seg[D].mem_phys << CLICK_SHIFT;
16860 i = sys_copy(ABS, 0, parent_abs, ABS, 0, child_abs, prog_bytes);
16861 if (i < 0) panic("do_fork can't copy", i);
16862
16863 /* Find a slot in 'mproc' for the child process. A slot must exist. */
16864 for (rmc = &mproc[0]; rmc < &mproc[NR_PROCS]; rmc++)
16865 if ( (rmc->mp_flags & IN_USE) == 0) break;
16866
16867 /* Set up the child and its memory map; copy its 'mproc' slot from parent. */
16868 child_nr = (int)(rmc - mproc); /* slot number of the child */
16869 procs_in_use++;
16870 *rmc = *rmp; /* copy parent's process slot to child's */
16871
16872 rmc->mp_parent = who; /* record child's parent */
16873 rmc->mp_flags &= ~TRACED; /* child does not inherit trace status */
16874 /* A separate I&D child keeps the parents text segment. The data and stack
16875 * segments must refer to the new copy.
16876 */
16877 if (!(rmc->mp_flags & SEPARATE)) rmc->mp_seg[T].mem_phys = child_base;
16878 rmc->mp_seg[D].mem_phys = child_base;
16879 rmc->mp_seg[S].mem_phys = rmc->mp_seg[D].mem_phys +
16880 (rmp->mp_seg[S].mem_vir - rmp->mp_seg[D].mem_vir);
16881 rmc->mp_exitstatus = 0;
16882 rmc->mp_sigstatus = 0;
16883
16884 /* Find a free pid for the child and put it in the table. */
.Op 233 src/mm/forkexit.c
16885 do {
16886 t = 0; /* 't' = 0 means pid still free */
16887 next_pid = (next_pid < 30000 ? next_pid + 1 : INIT_PID + 1);
16888 for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
16889 if (rmp->mp_pid == next_pid || rmp->mp_procgrp == next_pid) {
16890 t = 1;
16891 break;
16892 }
16893 rmc->mp_pid = next_pid; /* assign pid to child */
16894 } while (t);
16895
16896 /* Tell kernel and file system about the (now successful) FORK. */
16897 sys_fork(who, child_nr, rmc->mp_pid, child_base); /* child_base is 68K only*/
16898 tell_fs(FORK, who, child_nr, rmc->mp_pid);
16899
16900 /* Report child's memory map to kernel. */
16901 sys_newmap(child_nr, rmc->mp_seg);
16902
16903 /* Reply to child to wake it up. */
16904 reply(child_nr, 0, 0, NIL_PTR);
16905 return(next_pid); /* child's pid */
16906 }
16909 /*===========================================================================*
16910 * do_mm_exit *
16911 *===========================================================================*/
16912 PUBLIC int do_mm_exit()
16913 {
16914 /* Perform the exit(status) system call. The real work is done by mm_exit(),
16915 * which is also called when a process is killed by a signal.
16916 */
16917
16918 mm_exit(mp, status);
16919 dont_reply = TRUE; /* don't reply to newly terminated process */
16920 return(OK); /* pro forma return code */
16921 }
16924 /*===========================================================================*
16925 * mm_exit *
16926 *===========================================================================*/
16927 PUBLIC void mm_exit(rmp, exit_status)
16928 register struct mproc *rmp; /* pointer to the process to be terminated */
16929 int exit_status; /* the process' exit status (for parent) */
16930 {
16931 /* A process is done. Release most of the process' possessions. If its
16932 * parent is waiting, release the rest, else hang.
16933 */
16934
16935 register int proc_nr;
16936 int parent_waiting, right_child;
16937 pid_t pidarg, procgrp;
16938 phys_clicks base, size, s; /* base and size used on 68000 only */
16939
16940 proc_nr = (int) (rmp - mproc); /* get process slot number */
16941
16942 /* Remember a session leader's process group. */
16943 procgrp = (rmp->mp_pid == mp->mp_procgrp) ? mp->mp_procgrp : 0;
16944
.Ep 234 src/mm/forkexit.c
16945 /* If the exited process has a timer pending, kill it. */
16946 if (rmp->mp_flags & ALARM_ON) set_alarm(proc_nr, (unsigned) 0);
16947
16948 /* Tell the kernel and FS that the process is no longer runnable. */
16949 tell_fs(EXIT, proc_nr, 0, 0); /* file system can free the proc slot */
16950 sys_xit(rmp->mp_parent, proc_nr, &base, &size);
16951
16952 /* Release the memory occupied by the child. */
16953 if (find_share(rmp, rmp->mp_ino, rmp->mp_dev, rmp->mp_ctime) == NULL) {
16954 /* No other process shares the text segment, so free it. */
16955 free_mem(rmp->mp_seg[T].mem_phys, rmp->mp_seg[T].mem_len);
16956 }
16957 /* Free the data and stack segments. */
16958 free_mem(rmp->mp_seg[D].mem_phys,
16959 rmp->mp_seg[S].mem_vir + rmp->mp_seg[S].mem_len - rmp->mp_seg[D].mem_vir);
16960
16961 /* The process slot can only be freed if the parent has done a WAIT. */
16962 rmp->mp_exitstatus = (char) exit_status;
16963 pidarg = mproc[rmp->mp_parent].mp_wpid; /* who's being waited for? */
16964 parent_waiting = mproc[rmp->mp_parent].mp_flags & WAITING;
16965 if (pidarg == -1 || pidarg == rmp->mp_pid || -pidarg == rmp->mp_procgrp)
16966 right_child = TRUE; /* child meets one of the 3 tests */
16967 else
16968 right_child = FALSE; /* child fails all 3 tests */
16969 if (parent_waiting && right_child)
16970 cleanup(rmp); /* tell parent and release child slot */
16971 else
16972 rmp->mp_flags |= HANGING; /* parent not waiting, suspend child */
16973
16974 /* If the process has children, disinherit them. INIT is the new parent. */
16975 for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
16976 if (rmp->mp_flags & IN_USE && rmp->mp_parent == proc_nr) {
16977 /* 'rmp' now points to a child to be disinherited. */
16978 rmp->mp_parent = INIT_PROC_NR;
16979 parent_waiting = mproc[INIT_PROC_NR].mp_flags & WAITING;
16980 if (parent_waiting && (rmp->mp_flags & HANGING)) cleanup(rmp);
16981 }
16982 }
16983
16984 /* Send a hangup to the process' process group if it was a session leader. */
16985 if (procgrp != 0) check_sig(-procgrp, SIGHUP);
16986 }
16989 /*===========================================================================*
16990 * do_waitpid *
16991 *===========================================================================*/
16992 PUBLIC int do_waitpid()
16993 {
16994 /* A process wants to wait for a child to terminate. If one is already waiting,
16995 * go clean it up and let this WAIT call terminate. Otherwise, really wait.
16996 * Both WAIT and WAITPID are handled by this code.
16997 */
16998
16999 register struct mproc *rp;
17000 int pidarg, options, children, res2;
17001
17002 /* A process calling WAIT never gets a reply in the usual way via the
17003 * reply() in the main loop (unless WNOHANG is set or no qualifying child
17004 * exists). If a child has already exited, the routine cleanup() sends
.Op 235 src/mm/forkexit.c
17005 * the reply to awaken the caller.
17006 */
17007
17008 /* Set internal variables, depending on whether this is WAIT or WAITPID. */
17009 pidarg = (mm_call == WAIT ? -1 : pid); /* first param of waitpid */
17010 options = (mm_call == WAIT ? 0 : sig_nr); /* third param of waitpid */
17011 if (pidarg == 0) pidarg = -mp->mp_procgrp; /* pidarg < 0 ==> proc grp */
17012
17013 /* Is there a child waiting to be collected? At this point, pidarg != 0:
17014 * pidarg > 0 means pidarg is pid of a specific process to wait for
17015 * pidarg == -1 means wait for any child
17016 * pidarg < -1 means wait for any child whose process group = -pidarg
17017 */
17018 children = 0;
17019 for (rp = &mproc[0]; rp < &mproc[NR_PROCS]; rp++) {
17020 if ( (rp->mp_flags & IN_USE) && rp->mp_parent == who) {
17021 /* The value of pidarg determines which children qualify. */
17022 if (pidarg > 0 && pidarg != rp->mp_pid) continue;
17023 if (pidarg < -1 && -pidarg != rp->mp_procgrp) continue;
17024
17025 children++; /* this child is acceptable */
17026 if (rp->mp_flags & HANGING) {
17027 /* This child meets the pid test and has exited. */
17028 cleanup(rp); /* this child has already exited */
17029 dont_reply = TRUE;
17030 return(OK);
17031 }
17032 if ((rp->mp_flags & STOPPED) && rp->mp_sigstatus) {
17033 /* This child meets the pid test and is being traced.*/
17034 res2 = 0177 | (rp->mp_sigstatus << 8);
17035 reply(who, rp->mp_pid, res2, NIL_PTR);
17036 dont_reply = TRUE;
17037 rp->mp_sigstatus = 0;
17038 return(OK);
17039 }
17040 }
17041 }
17042
17043 /* No qualifying child has exited. Wait for one, unless none exists. */
17044 if (children > 0) {
17045 /* At least 1 child meets the pid test exists, but has not exited. */
17046 if (options & WNOHANG) return(0); /* parent does not want to wait */
17047 mp->mp_flags |= WAITING; /* parent wants to wait */
17048 mp->mp_wpid = (pid_t) pidarg; /* save pid for later */
17049 dont_reply = TRUE; /* do not reply now though */
17050 return(OK); /* yes - wait for one to exit */
17051 } else {
17052 /* No child even meets the pid test. Return error immediately. */
17053 return(ECHILD); /* no - parent has no children */
17054 }
17055 }
17058 /*===========================================================================*
17059 * cleanup *
17060 *===========================================================================*/
17061 PRIVATE void cleanup(child)
17062 register struct mproc *child; /* tells which process is exiting */
17063 {
17064 /* Finish off the exit of a process. The process has exited or been killed
.Ep 236 src/mm/forkexit.c
17065 * by a signal, and its parent is waiting.
17066 */
17067
17068 int exitstatus;
17069
17070 /* Wake up the parent. */
17071 exitstatus = (child->mp_exitstatus << 8) | (child->mp_sigstatus & 0377);
17072 reply(child->mp_parent, child->mp_pid, exitstatus, NIL_PTR);
17073 mproc[child->mp_parent].mp_flags &= ~WAITING; /* parent no longer waiting */
17074
17075 /* Release the process table entry. */
17076 child->mp_flags = 0;
17077 procs_in_use--;
17078 }
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/mm/exec.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
17100 /* This file handles the EXEC system call. It performs the work as follows:
17101 * - see if the permissions allow the file to be executed
17102 * - read the header and extract the sizes
17103 * - fetch the initial args and environment from the user space
17104 * - allocate the memory for the new process
17105 * - copy the initial stack from MM to the process
17106 * - read in the text and data segments and copy to the process
17107 * - take care of setuid and setgid bits
17108 * - fix up 'mproc' table
17109 * - tell kernel about EXEC
17110 * - save offset to initial argc (for ps)
17111 *
17112 * The entry points into this file are:
17113 * do_exec: perform the EXEC system call
17114 * find_share: find a process whose text segment can be shared
17115 */
17116
17117 #include "mm.h"
17118 #include <sys/stat.h>
17119 #include <minix/callnr.h>
17120 #include <a.out.h>
17121 #include <signal.h>
17122 #include <string.h>
17123 #include "mproc.h"
17124 #include "param.h"
17125
17126 FORWARD _PROTOTYPE( void load_seg, (int fd, int seg, vir_bytes seg_bytes) );
17127 FORWARD _PROTOTYPE( int new_mem, (struct mproc *sh_mp, vir_bytes text_bytes,
17128 vir_bytes data_bytes, vir_bytes bss_bytes,
17129 vir_bytes stk_bytes, phys_bytes tot_bytes) );
17130 FORWARD _PROTOTYPE( void patch_ptr, (char stack [ARG_MAX ], vir_bytes base) );
17131 FORWARD _PROTOTYPE( int read_header, (int fd, int *ft, vir_bytes *text_bytes,
17132 vir_bytes *data_bytes, vir_bytes *bss_bytes,
17133 phys_bytes *tot_bytes, long *sym_bytes, vir_clicks sc,
17134 vir_bytes *pc) );
17135
17136
17137 /*===========================================================================*
17138 * do_exec *
17139 *===========================================================================*/
.Op 237 src/mm/exec.c
17140 PUBLIC int do_exec()
17141 {
17142 /* Perform the execve(name, argv, envp) call. The user library builds a
17143 * complete stack image, including pointers, args, environ, etc. The stack
17144 * is copied to a buffer inside MM, and then to the new core image.
17145 */
17146
17147 register struct mproc *rmp;
17148 struct mproc *sh_mp;
17149 int m, r, fd, ft, sn;
17150 static char mbuf[ARG_MAX]; /* buffer for stack and zeroes */
17151 static char name_buf[PATH_MAX]; /* the name of the file to exec */
17152 char *new_sp, *basename;
17153 vir_bytes src, dst, text_bytes, data_bytes, bss_bytes, stk_bytes, vsp;
17154 phys_bytes tot_bytes; /* total space for program, including gap */
17155 long sym_bytes;
17156 vir_clicks sc;
17157 struct stat s_buf;
17158 vir_bytes pc;
17159
17160 /* Do some validity checks. */
17161 rmp = mp;
17162 stk_bytes = (vir_bytes) stack_bytes;
17163 if (stk_bytes > ARG_MAX) return(ENOMEM); /* stack too big */
17164 if (exec_len <= 0 || exec_len > PATH_MAX) return(EINVAL);
17165
17166 /* Get the exec file name and see if the file is executable. */
17167 src = (vir_bytes) exec_name;
17168 dst = (vir_bytes) name_buf;
17169 r = sys_copy(who, D, (phys_bytes) src,
17170 MM_PROC_NR, D, (phys_bytes) dst, (phys_bytes) exec_len);
17171 if (r != OK) return(r); /* file name not in user data segment */
17172 tell_fs(CHDIR, who, FALSE, 0); /* switch to the user's FS environ. */
17173 fd = allowed(name_buf, &s_buf, X_BIT); /* is file executable? */
17174 if (fd < 0) return(fd); /* file was not executable */
17175
17176 /* Read the file header and extract the segment sizes. */
17177 sc = (stk_bytes + CLICK_SIZE - 1) >> CLICK_SHIFT;
17178 m = read_header(fd, &ft, &text_bytes, &data_bytes, &bss_bytes,
17179 &tot_bytes, &sym_bytes, sc, &pc);
17180 if (m < 0) {
17181 close(fd); /* something wrong with header */
17182 return(ENOEXEC);
17183 }
17184
17185 /* Fetch the stack from the user before destroying the old core image. */
17186 src = (vir_bytes) stack_ptr;
17187 dst = (vir_bytes) mbuf;
17188 r = sys_copy(who, D, (phys_bytes) src,
17189 MM_PROC_NR, D, (phys_bytes) dst, (phys_bytes)stk_bytes);
17190 if (r != OK) {
17191 close(fd); /* can't fetch stack (e.g. bad virtual addr) */
17192 return(EACCES);
17193 }
17194
17195 /* Can the process' text be shared with that of one already running? */
17196 sh_mp = find_share(rmp, s_buf.st_ino, s_buf.st_dev, s_buf.st_ctime);
17197
17198 /* Allocate new memory and release old memory. Fix map and tell kernel. */
17199 r = new_mem(sh_mp, text_bytes, data_bytes, bss_bytes, stk_bytes, tot_bytes);
.Ep 238 src/mm/exec.c
17200 if (r != OK) {
17201 close(fd); /* insufficient core or program too big */
17202 return(r);
17203 }
17204
17205 /* Save file identification to allow it to be shared. */
17206 rmp->mp_ino = s_buf.st_ino;
17207 rmp->mp_dev = s_buf.st_dev;
17208 rmp->mp_ctime = s_buf.st_ctime;
17209
17210 /* Patch up stack and copy it from MM to new core image. */
17211 vsp = (vir_bytes) rmp->mp_seg[S].mem_vir << CLICK_SHIFT;
17212 vsp += (vir_bytes) rmp->mp_seg[S].mem_len << CLICK_SHIFT;
17213 vsp -= stk_bytes;
17214 patch_ptr(mbuf, vsp);
17215 src = (vir_bytes) mbuf;
17216 r = sys_copy(MM_PROC_NR, D, (phys_bytes) src,
17217 who, D, (phys_bytes) vsp, (phys_bytes)stk_bytes);
17218 if (r != OK) panic("do_exec stack copy err", NO_NUM);
17219
17220 /* Read in text and data segments. */
17221 if (sh_mp != NULL) {
17222 lseek(fd, (off_t) text_bytes, SEEK_CUR); /* shared: skip text */
17223 } else {
17224 load_seg(fd, T, text_bytes);
17225 }
17226 load_seg(fd, D, data_bytes);
17227
17228
17229 close(fd); /* don't need exec file any more */
17230
17231 /* Take care of setuid/setgid bits. */
17232 if ((rmp->mp_flags & TRACED) == 0) { /* suppress if tracing */
17233 if (s_buf.st_mode & I_SET_UID_BIT) {