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COMPLETE.T：源码内容

12699 /* Send command bytes. */
12700 for (i = 0; i < outlen; i++) {
12701 while (in_byte(AHA_STATREG) & AHA_CDF) {} /* !! timeout */
12702 out_byte(AHA_DATAREG, *outptr++);
12703 }
12704
12705 /* Receive data bytes. */
12706 for (i = 0; i < inlen; i++) {
12707 while (!(in_byte(AHA_STATREG) & AHA_DF)
12708 && !(in_byte(AHA_INTRREG) & AHA_HACC)) {} /* !! timeout */
12709 *inptr++ = in_byte(AHA_DATAREG);
.Op 149 src/kernel/aha_scsi.c
12710 }
12711
12712 /* Wait for command completion. */
12713 while (!(in_byte(AHA_INTRREG) & AHA_HACC)) {} /* !! timeout */
12714 out_byte(AHA_CNTLREG, AHA_IRST); /* clear interrupt */
12715 if (aha_irq != 0) enable_irq(aha_irq);
12716
12717 /* !! should check status register here for invalid command */
12718 }
12721 /*===========================================================================*
12722 * aha_reset *
12723 *===========================================================================*/
12724 PRIVATE int aha_reset()
12725 {
12726 int stat;
12727 int irq, bus_on, bus_off, tr_speed;
12728 unsigned sg_max;
12729 long v;
12730 static char aha0_env[] = "AHA0", aha_fmt[] = "x:d:d:x";
12731 byte cmd[5], haidata[4], getcdata[3], extbios[2];
12732 struct milli_state ms;
12733
12734 /* Get the configuration info from the environment. */
12735 v = AHA_BASEREG;
12736 if (env_parse(aha0_env, aha_fmt, 0, &v, 0x000L, 0x3FFL) == EP_OFF) return 0;
12737 aha_basereg = v;
12738
12739 v = 15;
12740 (void) env_parse(aha0_env, aha_fmt, 1, &v, 2L, 15L);
12741 bus_on = v;
12742
12743 v = 1;
12744 (void) env_parse(aha0_env, aha_fmt, 2, &v, 1L, 64L);
12745 bus_off = v;
12746
12747 v = 0x00;
12748 (void) env_parse(aha0_env, aha_fmt, 3, &v, 0x00L, 0xFFL);
12749 tr_speed = v;
12750
12751 /* Reset controller, wait for self test to complete. */
12752 out_byte(AHA_CNTLREG, AHA_HRST);
12753 milli_start(&ms);
12754 while ((stat = in_byte(AHA_STATREG)) & AHA_STST) {
12755 if (milli_elapsed(&ms) >= AHA_TIMEOUT) {
12756 printf("aha0: AHA154x controller not respondingn");
12757 return(0);
12758 }
12759 }
12760
12761 /* Check for self-test failure. */
12762 if ((stat & (AHA_DIAGF | AHA_INIT | AHA_IDLE | AHA_CDF | AHA_DF))
12763 != (AHA_INIT | AHA_IDLE)) {
12764 printf("aha0: AHA154x controller failed self-testn");
12765 return(0);
12766 }
12767
12768 /* !! maybe a santity check here: make sure IDLE and INIT are set? */
12769
.Ep 150 src/kernel/aha_scsi.c
12770 /* Get information about controller type and configuration. */
12771 cmd[0] = AHACOM_HAINQUIRY;
12772 aha_command(1, cmd, 4, haidata);
12773
12774 cmd[0] = AHACOM_GETCONFIG;
12775 aha_command(1, cmd, 3, getcdata);
12776
12777 /* First inquiry byte tells what type of board. */
12778 aha_model = haidata[0];
12779
12780 /* Unlock the 1540C or 1540CF's mailbox interface. (This is to keep old
12781 * drivers from using the adapter if extended features are enabled.)
12782 */
12783 if (aha_model >= AHA1540C) {
12784 cmd[0] = AHACOM_EXTBIOS; /* get extended BIOS information */
12785 aha_command(1, cmd, 2, extbios);
12786 if (extbios[1] != 0) {
12787 /* Mailbox interface is locked, so unlock it. */
12788 cmd[0] = AHACOM_MBOX_ENABLE;
12789 cmd[1] = 0; /* bit 0 = 0 (enable mailbox) */
12790 cmd[2] = extbios[1]; /* lock code to unlock mailbox */
12791 aha_command(3, cmd, 0, 0);
12792 }
12793 }
12794
12795 /* The maximum scatter/gather DMA list length depends on the board model. */
12796 sg_max = 16;
12797 if (aha_model == AHA1540) sg_max = 1; /* 1540 has no s/g */
12798 if (aha_model >= AHA1540C) sg_max = 255; /* 1540C has plenty */
12799
12800 /* Set up the DMA channel. */
12801 switch (getcdata[0]) {
12802 case 0x80: /* channel 7 */
12803 out_byte(0xD6, 0xC3);
12804 out_byte(0xD4, 0x03);
12805 break;
12806 case 0x40: /* channel 6 */
12807 out_byte(0xD6, 0xC2);
12808 out_byte(0xD4, 0x02);
12809 break;
12810 case 0x20: /* channel 5 */
12811 out_byte(0xD6, 0xC1);
12812 out_byte(0xD4, 0x01);
12813 break;
12814 case 0x01: /* channel 0 */
12815 out_byte(0x0B, 0x0C);
12816 out_byte(0x0A, 0x00);
12817 break;
12818 default:
12819 printf("aha0: AHA154x: strange DMA channeln");
12820 return(0);
12821 }
12822
12823 /* Get the configured IRQ. */
12824 switch (getcdata[1]) {
12825 case 0x40: irq = 15; break;
12826 case 0x20: irq = 14; break;
12827 case 0x08: irq = 12; break;
12828 case 0x04: irq = 11; break;
12829 case 0x02: irq = 10; break;
.Op 151 src/kernel/aha_scsi.c
12830 case 0x01: irq = 9; break;
12831 default:
12832 printf("aha0: strange IRQ settingn");
12833 return(0);
12834 }
12835
12836 /* Enable interrupts on the given irq. */
12837 put_irq_handler(irq, s_handler);
12838 aha_irq = irq;
12839 enable_irq(irq);
12840
12841 /* Initialize request related data: Command Control Block, mailboxes.
12842 * (We want to have the mailboxes initialized early, because the 1540C
12843 * wants to know it now.)
12844 */
12845
12846 /* Init ccb. */
12847 rq->ccb.senselen = CCB_SENSEREQ; /* always want sense info */
12848 h2b24(rq->ccb.linkptr, 0L); /* never link commands */
12849 rq->ccb.linkid = 0;
12850 rq->ccb.reserved[0] = 0;
12851 rq->ccb.reserved[1] = 0;
12852
12853 /* Scatter/gather maximum. */
12854 rq->dmalimit = rq->dmalist + (sg_max < NR_IOREQS ? sg_max : NR_IOREQS);
12855
12856 /* Outgoing mailbox. */
12857 mailbox[0].status = AHA_MBOXFREE;
12858 h2b24(mailbox[0].ccbptr, vir2phys(&rq->ccb));
12859
12860 /* Incoming mailbox. */
12861 mailbox[1].status = AHA_MBOXFREE;
12862 /* mailbox[1].ccbptr filled by adapter after command execution. */
12863
12864 /* Tell controller where the mailboxes are and how many. */
12865 cmd[0] = AHACOM_INITBOX;
12866 cmd[1] = 1;
12867 h2b24(cmd + 2, vir2phys(mailbox));
12868 aha_command(5, cmd, 0, 0);
12869
12870 /* !! maybe sanity check: check status reg for initialization success */
12871
12872 /* Set bus on, bus off and transfer speed. */
12873 cmd[0] = AHACOM_BUSON;
12874 cmd[1] = bus_on;
12875 aha_command(2, cmd, 0, 0);
12876
12877 cmd[0] = AHACOM_BUSOFF;
12878 cmd[1] = bus_off;
12879 aha_command(2, cmd, 0, 0);
12880
12881 cmd[0] = AHACOM_SPEED;
12882 cmd[1] = tr_speed;
12883 aha_command(2, cmd, 0, 0);
12884
12885 /* Set SCSI selection timeout. */
12886 cmd[0] = AHACOM_SETIMEOUT;
12887 cmd[1] = SCSI_TIMEOUT != 0; /* timeouts on/off */
12888 cmd[2] = 0; /* reserved */
12889 cmd[3] = SCSI_TIMEOUT / 256; /* MSB */
.Ep 152 src/kernel/aha_scsi.c
12890 cmd[4] = SCSI_TIMEOUT % 256; /* LSB */
12891 aha_command(5, cmd, 0, 0);
12892
12893 return(1);
12894 }
12897 /*===========================================================================*
12898 * s_handler *
12899 *===========================================================================*/
12900 PRIVATE int s_handler(irq)
12901 int irq;
12902 {
12903 /* Host adapter interrupt, send message to SCSI task and reenable interrupts. */
12904
12905 if (in_byte(AHA_INTRREG) & AHA_HACC) {
12906 /* Simple commands are polled. */
12907 return 0;
12908 } else {
12909 out_byte(AHA_CNTLREG, AHA_IRST); /* clear interrupt */
12910 interrupt(SCSI);
12911 return 1;
12912 }
12913 }
12916 /*===========================================================================*
12917 * h2b16 *
12918 *===========================================================================*/
12919 PRIVATE void h2b16(b, h)
12920 big16 b;
12921 U16_t h;
12922 {
12923 /* Host byte order to Big Endian conversion. */
12924 b[0] = h >> 8;
12925 b[1] = h >> 0;
12926 }
12929 /*===========================================================================*
12930 * h2b24 *
12931 *===========================================================================*/
12932 PRIVATE void h2b24(b, h)
12933 big24 b;
12934 u32_t h;
12935 {
12936 b[0] = h >> 16;
12937 b[1] = h >> 8;
12938 b[2] = h >> 0;
12939 }
12942 /*===========================================================================*
12943 * h2b32 *
12944 *===========================================================================*/
12945 PRIVATE void h2b32(b, h)
12946 big32 b;
12947 u32_t h;
12948 {
12949 b[0] = h >> 24;
.Op 153 src/kernel/aha_scsi.c
12950 b[1] = h >> 16;
12951 b[2] = h >> 8;
12952 b[3] = h >> 0;
12953 }
12956 /*===========================================================================*
12957 * b2h16 *
12958 *===========================================================================*/
12959 PRIVATE u16_t b2h16(b)
12960 big16 b;
12961 {
12962 return ((u16_t) b[0] << 8)
12963 | ((u16_t) b[1] << 0);
12964 }
12967 /*===========================================================================*
12968 * b2h24 *
12969 *===========================================================================*/
12970 PRIVATE u32_t b2h24(b)
12971 big24 b;
12972 {
12973 return ((u32_t) b[0] << 16)
12974 | ((u32_t) b[1] << 8)
12975 | ((u32_t) b[2] << 0);
12976 }
12979 /*===========================================================================*
12980 * b2h32 *
12981 *===========================================================================*/
12982 PRIVATE u32_t b2h32(b)
12983 big32 b;
12984 {
12985 return ((u32_t) b[0] << 24)
12986 | ((u32_t) b[1] << 16)
12987 | ((u32_t) b[2] << 8)
12988 | ((u32_t) b[3] << 0);
12989 }
12992 #if AHA_DEBUG & 2
12993 /*===========================================================================*
12994 * errordump *
12995 *===========================================================================*/
12996 PRIVATE void errordump()
12997 {
12998 int i;
12999
13000 printf("aha ccb dump:");
13001 for (i = 0; i < sizeof(rq->ccb); i++) {
13002 if (i % 26 == 0) printf("n");
13003 printf(" %02x", ((byte *) &rq->ccb)[i]);
13004 }
13005 printf("n");
13006 }
13007 #endif /* AHA_DEBUG & 2 */
13008
13009
.Ep 154 src/kernel/aha_scsi.c
13010 #if AHA_DEBUG & 4
13011 /*===========================================================================*
13012 * show_req *
13013 *===========================================================================*/
13014 PRIVATE void show_req()
13015 {
13016 struct iorequest_s **iopp;
13017 dma_t *dmap;
13018 unsigned count, nbytes, len;
13019
13020 iopp = rq->iov;
13021 dmap = rq->dmalist;
13022 count = rq->count;
13023 nbytes = 0;
13024
13025 printf("%lu:%u", rq->pos, count);
13026
13027 while (count > 0) {
13028 if (iopp == rq->iov || *iopp != iopp[-1])
13029 nbytes = (*iopp)->io_nbytes;
13030
13031 printf(" (%u,%lx,%u)", nbytes, b2h24(dmap->dataptr),
13032 len = b2h24(dmap->datalen));
13033 dmap++;
13034 iopp++;
13035 count -= len;
13036 nbytes -= len;
13037 }
13038 if (nbytes > 0) printf(" ...(%u)", nbytes);
13039 printf("n");
13040 }
13041 #endif /* AHA_DEBUG & 4 */
13042
13043
13044 #if AHA_DEBUG & 8
13045 /*===========================================================================*
13046 * dump_scsi_cmd *
13047 *===========================================================================*/
13048 PRIVATE void dump_scsi_cmd()
13049 {
13050 int i;
13051
13052 printf("scsi cmd:");
13053 for (i = 0; i < rq->ccb.cmdlen; i++) printf(" %02x", rq->ccb.cmd[i]);
13054 printf("n");
13055 }
13056 #endif /* AHA_DEBUG & 8 */
13057
13058
13059 /*============================================================================*
13060 * s_geometry *
13061 *============================================================================*/
13062 PRIVATE void s_geometry(entry)
13063 struct partition *entry;
13064 {
13065 /* The geometry of a SCSI drive is a complete fake, the Adaptec onboard BIOS
13066 * makes the drive look like a regular drive on the outside. A DOS program
13067 * takes a logical block address, computes cylinder, head and sector like the
13068 * BIOS int 0x13 call expects, and the Adaptec turns this back into a block
13069 * address again. The only reason we care is because some idiot put cylinder,
.Op 155 src/kernel/aha_scsi.c
13070 * head and sector numbers in the partition table, so fdisk needs to know the
13071 * geometry.
13072 */
13073 unsigned long size = s_sp->part[0].dv_size;
13074 unsigned heads, sectors;
13075
13076 if (size < 1024L * 64 * 32 * 512) {
13077 /* Small drive. */
13078 heads = 64;
13079 sectors = 32;
13080 } else {
13081 /* Assume that this BIOS is configured for large drives. */
13082 heads = 255;
13083 sectors = 63;
13084 }
13085 entry->cylinders = (size >> SECTOR_SHIFT) / (heads * sectors);
13086 entry->heads = heads;
13087 entry->sectors = sectors;
13088 }
13089 #endif /* !ENABLE_ADAPTEC_SCSI */
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/at_wini.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
13100 /* This file contains the device dependent part of a driver for the IBM-AT
13101 * winchester controller.
13102 * It was written by Adri Koppes.
13103 *
13104 * The file contains one entry point:
13105 *
13106 * at_winchester_task: main entry when system is brought up
13107 *
13108 *
13109 * Changes:
13110 * 13 Apr 1992 by Kees J. Bot: device dependent/independent split.
13111 */
13112
13113 #include "kernel.h"
13114 #include "driver.h"
13115 #include "drvlib.h"
13116
13117 #if ENABLE_AT_WINI
13118
13119 /* I/O Ports used by winchester disk controllers. */
13120
13121 /* Read and write registers */
13122 #define REG_BASE0 0x1F0 /* base register of controller 0 */
13123 #define REG_BASE1 0x170 /* base register of controller 1 */
13124 #define REG_DATA 0 /* data register (offset from the base reg.) */
13125 #define REG_PRECOMP 1 /* start of write precompensation */
13126 #define REG_COUNT 2 /* sectors to transfer */
13127 #define REG_SECTOR 3 /* sector number */
13128 #define REG_CYL_LO 4 /* low byte of cylinder number */
13129 #define REG_CYL_HI 5 /* high byte of cylinder number */
.Ep 156 src/kernel/at_wini.c
13130 #define REG_LDH 6 /* lba, drive and head */
13131 #define LDH_DEFAULT 0xA0 /* ECC enable, 512 bytes per sector */
13132 #define LDH_LBA 0x40 /* Use LBA addressing */
13133 #define ldh_init(drive) (LDH_DEFAULT | ((drive) << 4))
13134
13135 /* Read only registers */
13136 #define REG_STATUS 7 /* status */
13137 #define STATUS_BSY 0x80 /* controller busy */
13138 #define STATUS_RDY 0x40 /* drive ready */
13139 #define STATUS_WF 0x20 /* write fault */
13140 #define STATUS_SC 0x10 /* seek complete (obsolete) */
13141 #define STATUS_DRQ 0x08 /* data transfer request */
13142 #define STATUS_CRD 0x04 /* corrected data */
13143 #define STATUS_IDX 0x02 /* index pulse */
13144 #define STATUS_ERR 0x01 /* error */
13145 #define REG_ERROR 1 /* error code */
13146 #define ERROR_BB 0x80 /* bad block */
13147 #define ERROR_ECC 0x40 /* bad ecc bytes */
13148 #define ERROR_ID 0x10 /* id not found */
13149 #define ERROR_AC 0x04 /* aborted command */
13150 #define ERROR_TK 0x02 /* track zero error */
13151 #define ERROR_DM 0x01 /* no data address mark */
13152
13153 /* Write only registers */
13154 #define REG_COMMAND 7 /* command */
13155 #define CMD_IDLE 0x00 /* for w_command: drive idle */
13156 #define CMD_RECALIBRATE 0x10 /* recalibrate drive */
13157 #define CMD_READ 0x20 /* read data */
13158 #define CMD_WRITE 0x30 /* write data */
13159 #define CMD_READVERIFY 0x40 /* read verify */
13160 #define CMD_FORMAT 0x50 /* format track */
13161 #define CMD_SEEK 0x70 /* seek cylinder */
13162 #define CMD_DIAG 0x90 /* execute device diagnostics */
13163 #define CMD_SPECIFY 0x91 /* specify parameters */
13164 #define ATA_IDENTIFY 0xEC /* identify drive */
13165 #define REG_CTL 0x206 /* control register */
13166 #define CTL_NORETRY 0x80 /* disable access retry */
13167 #define CTL_NOECC 0x40 /* disable ecc retry */
13168 #define CTL_EIGHTHEADS 0x08 /* more than eight heads */
13169 #define CTL_RESET 0x04 /* reset controller */
13170 #define CTL_INTDISABLE 0x02 /* disable interrupts */
13171
13172 /* Interrupt request lines. */
13173 #define AT_IRQ0 14 /* interrupt number for controller 0 */
13174 #define AT_IRQ1 15 /* interrupt number for controller 1 */
13175
13176 /* Common command block */
13177 struct command {
13178 u8_t precomp; /* REG_PRECOMP, etc. */
13179 u8_t count;
13180 u8_t sector;
13181 u8_t cyl_lo;
13182 u8_t cyl_hi;
13183 u8_t ldh;
13184 u8_t command;
13185 };
13186
13187
13188 /* Error codes */
13189 #define ERR (-1) /* general error */
.Op 157 src/kernel/at_wini.c
13190 #define ERR_BAD_SECTOR (-2) /* block marked bad detected */
13191
13192 /* Some controllers don't interrupt, the clock will wake us up. */
13193 #define WAKEUP (32*HZ) /* drive may be out for 31 seconds max */
13194
13195 /* Miscellaneous. */
13196 #define MAX_DRIVES 4 /* this driver supports 4 drives (hd0 - hd19) */
13197 #if _WORD_SIZE > 2
13198 #define MAX_SECS 256 /* controller can transfer this many sectors */
13199 #else
13200 #define MAX_SECS 127 /* but not to a 16 bit process */
13201 #endif
13202 #define MAX_ERRORS 4 /* how often to try rd/wt before quitting */
13203 #define NR_DEVICES (MAX_DRIVES * DEV_PER_DRIVE)
13204 #define SUB_PER_DRIVE (NR_PARTITIONS * NR_PARTITIONS)
13205 #define NR_SUBDEVS (MAX_DRIVES * SUB_PER_DRIVE)
13206 #define TIMEOUT 32000 /* controller timeout in ms */
13207 #define RECOVERYTIME 500 /* controller recovery time in ms */
13208 #define INITIALIZED 0x01 /* drive is initialized */
13209 #define DEAF 0x02 /* controller must be reset */
13210 #define SMART 0x04 /* drive supports ATA commands */
13211
13212
13213 /* Variables. */
13214 PRIVATE struct wini { /* main drive struct, one entry per drive */
13215 unsigned state; /* drive state: deaf, initialized, dead */
13216 unsigned base; /* base register of the register file */
13217 unsigned irq; /* interrupt request line */
13218 unsigned lcylinders; /* logical number of cylinders (BIOS) */
13219 unsigned lheads; /* logical number of heads */
13220 unsigned lsectors; /* logical number of sectors per track */
13221 unsigned pcylinders; /* physical number of cylinders (translated) */
13222 unsigned pheads; /* physical number of heads */
13223 unsigned psectors; /* physical number of sectors per track */
13224 unsigned ldhpref; /* top four bytes of the LDH (head) register */
13225 unsigned precomp; /* write precompensation cylinder / 4 */
13226 unsigned max_count; /* max request for this drive */
13227 unsigned open_ct; /* in-use count */
13228 struct device part[DEV_PER_DRIVE]; /* primary partitions: hd[0-4] */
13229 struct device subpart[SUB_PER_DRIVE]; /* subpartitions: hd[1-4][a-d] */
13230 } wini[MAX_DRIVES], *w_wn;
13231
13232 PRIVATE struct trans {
13233 struct iorequest_s *iop; /* belongs to this I/O request */
13234 unsigned long block; /* first sector to transfer */
13235 unsigned count; /* byte count */
13236 phys_bytes phys; /* user physical address */
13237 } wtrans[NR_IOREQS];
13238
13239 PRIVATE struct trans *w_tp; /* to add transfer requests */
13240 PRIVATE unsigned w_count; /* number of bytes to transfer */
13241 PRIVATE unsigned long w_nextblock; /* next block on disk to transfer */
13242 PRIVATE int w_opcode; /* DEV_READ or DEV_WRITE */
13243 PRIVATE int w_command; /* current command in execution */
13244 PRIVATE int w_status; /* status after interrupt */
13245 PRIVATE int w_drive; /* selected drive */
13246 PRIVATE struct device *w_dv; /* device's base and size */
13247
13248 FORWARD _PROTOTYPE( void init_params, (void) );
13249 FORWARD _PROTOTYPE( int w_do_open, (struct driver *dp, message *m_ptr) );
.Ep 158 src/kernel/at_wini.c
13250 FORWARD _PROTOTYPE( struct device *w_prepare, (int device) );
13251 FORWARD _PROTOTYPE( int w_identify, (void) );
13252 FORWARD _PROTOTYPE( char *w_name, (void) );
13253 FORWARD _PROTOTYPE( int w_specify, (void) );
13254 FORWARD _PROTOTYPE( int w_schedule, (int proc_nr, struct iorequest_s *iop) );
13255 FORWARD _PROTOTYPE( int w_finish, (void) );
13256 FORWARD _PROTOTYPE( int com_out, (struct command *cmd) );
13257 FORWARD _PROTOTYPE( void w_need_reset, (void) );
13258 FORWARD _PROTOTYPE( int w_do_close, (struct driver *dp, message *m_ptr) );
13259 FORWARD _PROTOTYPE( int com_simple, (struct command *cmd) );
13260 FORWARD _PROTOTYPE( void w_timeout, (void) );
13261 FORWARD _PROTOTYPE( int w_reset, (void) );
13262 FORWARD _PROTOTYPE( int w_intr_wait, (void) );
13263 FORWARD _PROTOTYPE( int w_waitfor, (int mask, int value) );
13264 FORWARD _PROTOTYPE( int w_handler, (int irq) );
13265 FORWARD _PROTOTYPE( void w_geometry, (struct partition *entry) );
13266
13267 /* w_waitfor loop unrolled once for speed. */
13268 #define waitfor(mask, value)
13269 ((in_byte(w_wn->base + REG_STATUS) & mask) == value
13270 || w_waitfor(mask, value))
13271
13272
13273 /* Entry points to this driver. */
13274 PRIVATE struct driver w_dtab = {
13275 w_name, /* current device's name */
13276 w_do_open, /* open or mount request, initialize device */
13277 w_do_close, /* release device */
13278 do_diocntl, /* get or set a partition's geometry */
13279 w_prepare, /* prepare for I/O on a given minor device */
13280 w_schedule, /* precompute cylinder, head, sector, etc. */
13281 w_finish, /* do the I/O */
13282 nop_cleanup, /* nothing to clean up */
13283 w_geometry, /* tell the geometry of the disk */
13284 };
13285
13286 #if ENABLE_ATAPI
13287 #include "atapi.c" /* extra code for ATAPI CD-ROM */
13288 #endif
13289
13290
13291 /*===========================================================================*
13292 * at_winchester_task *
13293 *===========================================================================*/
13294 PUBLIC void at_winchester_task()
13295 {
13296 /* Set special disk parameters then call the generic main loop. */
13297
13298 init_params();
13299
13300 driver_task(&w_dtab);
13301 }
13304 /*============================================================================*
13305 * init_params *
13306 *============================================================================*/
13307 PRIVATE void init_params()
13308 {
13309 /* This routine is called at startup to initialize the drive parameters. */
.Op 159 src/kernel/at_wini.c
13310
13311 u16_t parv[2];
13312 unsigned int vector;
13313 int drive, nr_drives, i;
13314 struct wini *wn;
13315 u8_t params[16];
13316 phys_bytes param_phys = vir2phys(params);
13317
13318 /* Get the number of drives from the BIOS data area */
13319 phys_copy(0x475L, param_phys, 1L);
13320 if ((nr_drives = params[0]) > 2) nr_drives = 2;
13321
13322 for (drive = 0, wn = wini; drive < MAX_DRIVES; drive++, wn++) {
13323 if (drive < nr_drives) {
13324 /* Copy the BIOS parameter vector */
13325 vector = drive == 0 ? WINI_0_PARM_VEC : WINI_1_PARM_VEC;
13326 phys_copy(vector * 4L, vir2phys(parv), 4L);
13327
13328 /* Calculate the address of the parameters and copy them */
13329 phys_copy(hclick_to_physb(parv[1]) + parv[0], param_phys, 16L);
13330
13331 /* Copy the parameters to the structures of the drive */
13332 wn->lcylinders = bp_cylinders(params);
13333 wn->lheads = bp_heads(params);
13334 wn->lsectors = bp_sectors(params);
13335 wn->precomp = bp_precomp(params) >> 2;
13336 }
13337 wn->ldhpref = ldh_init(drive);
13338 wn->max_count = MAX_SECS << SECTOR_SHIFT;
13339 if (drive < 2) {
13340 /* Controller 0. */
13341 wn->base = REG_BASE0;
13342 wn->irq = AT_IRQ0;
13343 } else {
13344 /* Controller 1. */
13345 wn->base = REG_BASE1;
13346 wn->irq = AT_IRQ1;
13347 }
13348 }
13349 }
13352 /*============================================================================*
13353 * w_do_open *
13354 *============================================================================*/
13355 PRIVATE int w_do_open(dp, m_ptr)
13356 struct driver *dp;
13357 message *m_ptr;
13358 {
13359 /* Device open: Initialize the controller and read the partition table. */
13360
13361 int r;
13362 struct wini *wn;
13363 struct command cmd;
13364
13365 if (w_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
13366 wn = w_wn;
13367
13368 if (wn->state == 0) {
13369 /* Try to identify the device. */
.Ep 160 src/kernel/at_wini.c
13370 if (w_identify() != OK) {
13371 printf("%s: probe failedn", w_name());
13372 if (wn->state & DEAF) w_reset();
13373 wn->state = 0;
13374 return(ENXIO);
13375 }
13376 }
13377 if (wn->open_ct++ == 0) {
13378 /* Partition the disk. */
13379 partition(&w_dtab, w_drive * DEV_PER_DRIVE, P_PRIMARY);
13380 }
13381 return(OK);
13382 }
13385 /*===========================================================================*
13386 * w_prepare *
13387 *===========================================================================*/
13388 PRIVATE struct device *w_prepare(device)
13389 int device;
13390 {
13391 /* Prepare for I/O on a device. */
13392
13393 /* Nothing to transfer as yet. */
13394 w_count = 0;
13395
13396 if (device < NR_DEVICES) { /* hd0, hd1, ... */
13397 w_drive = device / DEV_PER_DRIVE; /* save drive number */
13398 w_wn = &wini[w_drive];
13399 w_dv = &w_wn->part[device % DEV_PER_DRIVE];
13400 } else
13401 if ((unsigned) (device -= MINOR_hd1a) < NR_SUBDEVS) { /* hd1a, hd1b, ... */
13402 w_drive = device / SUB_PER_DRIVE;
13403 w_wn = &wini[w_drive];
13404 w_dv = &w_wn->subpart[device % SUB_PER_DRIVE];
13405 } else {
13406 return(NIL_DEV);
13407 }
13408 return(w_dv);
13409 }
13412 /*===========================================================================*
13413 * w_identify *
13414 *===========================================================================*/
13415 PRIVATE int w_identify()
13416 {
13417 /* Find out if a device exists, if it is an old AT disk, or a newer ATA
13418 * drive, a removable media device, etc.
13419 */
13420
13421 struct wini *wn = w_wn;
13422 struct command cmd;
13423 char id_string[40];
13424 int i, r;
13425 unsigned long size;
13426 #define id_byte(n) (&tmp_buf[2 * (n)])
13427 #define id_word(n) (((u16_t) id_byte(n)[0] << 0)
13428 |((u16_t) id_byte(n)[1] << 8))
13429 #define id_longword(n) (((u32_t) id_byte(n)[0] << 0)
.Op 161 src/kernel/at_wini.c
13430 |((u32_t) id_byte(n)[1] << 8)
13431 |((u32_t) id_byte(n)[2] << 16)
13432 |((u32_t) id_byte(n)[3] << 24))
13433
13434 /* Check if the one of the registers exists. */
13435 r = in_byte(wn->base + REG_CYL_LO);
13436 out_byte(wn->base + REG_CYL_LO, ~r);
13437 if (in_byte(wn->base + REG_CYL_LO) == r) return(ERR);
13438
13439 /* Looks OK; register IRQ and try an ATA identify command. */
13440 put_irq_handler(wn->irq, w_handler);
13441 enable_irq(wn->irq);
13442
13443 cmd.ldh = wn->ldhpref;
13444 cmd.command = ATA_IDENTIFY;
13445 if (com_simple(&cmd) == OK) {
13446 /* This is an ATA device. */
13447 wn->state |= SMART;
13448
13449 /* Device information. */
13450 port_read(wn->base + REG_DATA, tmp_phys, SECTOR_SIZE);
13451
13452 /* Why are the strings byte swapped??? */
13453 for (i = 0; i < 40; i++) id_string[i] = id_byte(27)[i^1];
13454
13455 /* Preferred CHS translation mode. */
13456 wn->pcylinders = id_word(1);
13457 wn->pheads = id_word(3);
13458 wn->psectors = id_word(6);
13459 size = (u32_t) wn->pcylinders * wn->pheads * wn->psectors;
13460
13461 if ((id_byte(49)[1] & 0x02) && size > 512L*1024*2) {
13462 /* Drive is LBA capable and is big enough to trust it to
13463 * not make a mess of it.
13464 */
13465 wn->ldhpref |= LDH_LBA;
13466 size = id_longword(60);
13467 }
13468
13469 if (wn->lcylinders == 0) {
13470 /* No BIOS parameters? Then make some up. */
13471 wn->lcylinders = wn->pcylinders;
13472 wn->lheads = wn->pheads;
13473 wn->lsectors = wn->psectors;
13474 while (wn->lcylinders > 1024) {
13475 wn->lheads *= 2;
13476 wn->lcylinders /= 2;
13477 }
13478 }
13479 } else {
13480 /* Not an ATA device; no translations, no special features. Don't
13481 * touch it unless the BIOS knows about it.
13482 */
13483 if (wn->lcylinders == 0) return(ERR); /* no BIOS parameters */
13484 wn->pcylinders = wn->lcylinders;
13485 wn->pheads = wn->lheads;
13486 wn->psectors = wn->lsectors;
13487 size = (u32_t) wn->pcylinders * wn->pheads * wn->psectors;
13488 }
13489 /* The fun ends at 4 GB. */
.Ep 162 src/kernel/at_wini.c
13490 if (size > ((u32_t) -1) / SECTOR_SIZE) size = ((u32_t) -1) / SECTOR_SIZE;
13491
13492 /* Base and size of the whole drive */
13493 wn->part[0].dv_base = 0;
13494 wn->part[0].dv_size = size << SECTOR_SHIFT;
13495
13496 if (w_specify() != OK && w_specify() != OK) return(ERR);
13497
13498 printf("%s: ", w_name());
13499 if (wn->state & SMART) {
13500 printf("%.40sn", id_string);
13501 } else {
13502 printf("%ux%ux%un", wn->pcylinders, wn->pheads, wn->psectors);
13503 }
13504 return(OK);
13505 }
13508 /*===========================================================================*
13509 * w_name *
13510 *===========================================================================*/
13511 PRIVATE char *w_name()
13512 {
13513 /* Return a name for the current device. */
13514 static char name[] = "at-hd15";
13515 unsigned device = w_drive * DEV_PER_DRIVE;
13516
13517 if (device < 10) {
13518 name[5] = '0' + device;
13519 name[6] = 0;
13520 } else {
13521 name[5] = '0' + device / 10;
13522 name[6] = '0' + device % 10;
13523 }
13524 return name;
13525 }
13528 /*===========================================================================*
13529 * w_specify *
13530 *===========================================================================*/
13531 PRIVATE int w_specify()
13532 {
13533 /* Routine to initialize the drive after boot or when a reset is needed. */
13534
13535 struct wini *wn = w_wn;
13536 struct command cmd;
13537
13538 if ((wn->state & DEAF) && w_reset() != OK) return(ERR);
13539
13540 /* Specify parameters: precompensation, number of heads and sectors. */
13541 cmd.precomp = wn->precomp;
13542 cmd.count = wn->psectors;
13543 cmd.ldh = w_wn->ldhpref | (wn->pheads - 1);
13544 cmd.command = CMD_SPECIFY; /* Specify some parameters */
13545
13546 if (com_simple(&cmd) != OK) return(ERR);
13547
13548 if (!(wn->state & SMART)) {
13549 /* Calibrate an old disk. */
.Op 163 src/kernel/at_wini.c
13550 cmd.sector = 0;
13551 cmd.cyl_lo = 0;
13552 cmd.cyl_hi = 0;
13553 cmd.ldh = w_wn->ldhpref;
13554 cmd.command = CMD_RECALIBRATE;
13555
13556 if (com_simple(&cmd) != OK) return(ERR);
13557 }
13558
13559 wn->state |= INITIALIZED;
13560 return(OK);
13561 }
13564 /*===========================================================================*
13565 * w_schedule *
13566 *===========================================================================*/
13567 PRIVATE int w_schedule(proc_nr, iop)
13568 int proc_nr; /* process doing the request */
13569 struct iorequest_s *iop; /* pointer to read or write request */
13570 {
13571 /* Gather I/O requests on consecutive blocks so they may be read/written
13572 * in one controller command. (There is enough time to compute the next
13573 * consecutive request while an unwanted block passes by.)
13574 */
13575 struct wini *wn = w_wn;
13576 int r, opcode;
13577 unsigned long pos;
13578 unsigned nbytes, count;
13579 unsigned long block;
13580 phys_bytes user_phys;
13581
13582 /* This many bytes to read/write */
13583 nbytes = iop->io_nbytes;
13584 if ((nbytes & SECTOR_MASK) != 0) return(iop->io_nbytes = EINVAL);
13585
13586 /* From/to this position on the device */
13587 pos = iop->io_position;
13588 if ((pos & SECTOR_MASK) != 0) return(iop->io_nbytes = EINVAL);
13589
13590 /* To/from this user address */
13591 user_phys = numap(proc_nr, (vir_bytes) iop->io_buf, nbytes);
13592 if (user_phys == 0) return(iop->io_nbytes = EINVAL);
13593
13594 /* Read or write? */
13595 opcode = iop->io_request & ~OPTIONAL_IO;
13596
13597 /* Which block on disk and how close to EOF? */
13598 if (pos >= w_dv->dv_size) return(OK); /* At EOF */
13599 if (pos + nbytes > w_dv->dv_size) nbytes = w_dv->dv_size - pos;
13600 block = (w_dv->dv_base + pos) >> SECTOR_SHIFT;
13601
13602 if (w_count > 0 && block != w_nextblock) {
13603 /* This new request can't be chained to the job being built */
13604 if ((r = w_finish()) != OK) return(r);
13605 }
13606
13607 /* The next consecutive block */
13608 w_nextblock = block + (nbytes >> SECTOR_SHIFT);
13609
.Ep 164 src/kernel/at_wini.c
13610 /* While there are "unscheduled" bytes in the request: */
13611 do {
13612 count = nbytes;
13613
13614 if (w_count == wn->max_count) {
13615 /* The drive can't do more then max_count at once */
13616 if ((r = w_finish()) != OK) return(r);
13617 }
13618
13619 if (w_count + count > wn->max_count)
13620 count = wn->max_count - w_count;
13621
13622 if (w_count == 0) {
13623 /* The first request in a row, initialize. */
13624 w_opcode = opcode;
13625 w_tp = wtrans;
13626 }
13627
13628 /* Store I/O parameters */
13629 w_tp->iop = iop;
13630 w_tp->block = block;
13631 w_tp->count = count;
13632 w_tp->phys = user_phys;
13633
13634 /* Update counters */
13635 w_tp++;
13636 w_count += count;
13637 block += count >> SECTOR_SHIFT;
13638 user_phys += count;
13639 nbytes -= count;
13640 } while (nbytes > 0);
13641
13642 return(OK);
13643 }
13646 /*===========================================================================*
13647 * w_finish *
13648 *===========================================================================*/
13649 PRIVATE int w_finish()
13650 {
13651 /* Carry out the I/O requests gathered in wtrans[]. */
13652
13653 struct trans *tp = wtrans;
13654 struct wini *wn = w_wn;
13655 int r, errors;
13656 struct command cmd;
13657 unsigned cylinder, head, sector, secspcyl;
13658
13659 if (w_count == 0) return(OK); /* Spurious finish. */
13660
13661 r = ERR; /* Trigger the first com_out */
13662 errors = 0;
13663
13664 do {
13665 if (r != OK) {
13666 /* The controller must be (re)programmed. */
13667
13668 /* First check to see if a reinitialization is needed. */
13669 if (!(wn->state & INITIALIZED) && w_specify() != OK)
.Op 165 src/kernel/at_wini.c
13670 return(tp->iop->io_nbytes = EIO);
13671
13672 /* Tell the controller to transfer w_count bytes */
13673 cmd.precomp = wn->precomp;
13674 cmd.count = (w_count >> SECTOR_SHIFT) & BYTE;
13675 if (wn->ldhpref & LDH_LBA) {
13676 cmd.sector = (tp->block >> 0) & 0xFF;
13677 cmd.cyl_lo = (tp->block >> 8) & 0xFF;
13678 cmd.cyl_hi = (tp->block >> 16) & 0xFF;
13679 cmd.ldh = wn->ldhpref | ((tp->block >> 24) & 0xF);
13680 } else {
13681 secspcyl = wn->pheads * wn->psectors;
13682 cylinder = tp->block / secspcyl;
13683 head = (tp->block % secspcyl) / wn->psectors;
13684 sector = tp->block % wn->psectors;
13685 cmd.sector = sector + 1;
13686 cmd.cyl_lo = cylinder & BYTE;
13687 cmd.cyl_hi = (cylinder >> 8) & BYTE;
13688 cmd.ldh = wn->ldhpref | head;
13689 }
13690 cmd.command = w_opcode == DEV_WRITE ? CMD_WRITE : CMD_READ;
13691
13692 if ((r = com_out(&cmd)) != OK) {
13693 if (++errors == MAX_ERRORS) {
13694 w_command = CMD_IDLE;
13695 return(tp->iop->io_nbytes = EIO);
13696 }
13697 continue; /* Retry */
13698 }
13699 }
13700
13701 /* For each sector, wait for an interrupt and fetch the data (read),
13702 * or supply data to the controller and wait for an interrupt (write).
13703 */
13704
13705 if (w_opcode == DEV_READ) {
13706 if ((r = w_intr_wait()) == OK) {
13707 /* Copy data from the device's buffer to user space. */
13708
13709 port_read(wn->base + REG_DATA, tp->phys, SECTOR_SIZE);
13710
13711 tp->phys += SECTOR_SIZE;
13712 tp->iop->io_nbytes -= SECTOR_SIZE;
13713 w_count -= SECTOR_SIZE;
13714 if ((tp->count -= SECTOR_SIZE) == 0) tp++;
13715 } else {
13716 /* Any faulty data? */
13717 if (w_status & STATUS_DRQ) {
13718 port_read(wn->base + REG_DATA, tmp_phys,
13719 SECTOR_SIZE);
13720 }
13721 }
13722 } else {
13723 /* Wait for data requested. */
13724 if (!waitfor(STATUS_DRQ, STATUS_DRQ)) {
13725 r = ERR;
13726 } else {
13727 /* Fill the buffer of the drive. */
13728
13729 port_write(wn->base + REG_DATA, tp->phys, SECTOR_SIZE);
.Ep 166 src/kernel/at_wini.c
13730 r = w_intr_wait();
13731 }
13732
13733 if (r == OK) {
13734 /* Book the bytes successfully written. */
13735
13736 tp->phys += SECTOR_SIZE;
13737 tp->iop->io_nbytes -= SECTOR_SIZE;
13738 w_count -= SECTOR_SIZE;
13739 if ((tp->count -= SECTOR_SIZE) == 0) tp++;
13740 }
13741 }
13742
13743 if (r != OK) {
13744 /* Don't retry if sector marked bad or too many errors */
13745 if (r == ERR_BAD_SECTOR || ++errors == MAX_ERRORS) {
13746 w_command = CMD_IDLE;
13747 return(tp->iop->io_nbytes = EIO);
13748 }
13749
13750 /* Reset if halfway, but bail out if optional I/O. */
13751 if (errors == MAX_ERRORS / 2) {
13752 w_need_reset();
13753 if (tp->iop->io_request & OPTIONAL_IO) {
13754 w_command = CMD_IDLE;
13755 return(tp->iop->io_nbytes = EIO);
13756 }
13757 }
13758 continue; /* Retry */
13759 }
13760 errors = 0;
13761 } while (w_count > 0);
13762
13763 w_command = CMD_IDLE;
13764 return(OK);
13765 }
13768 /*============================================================================*
13769 * com_out *
13770 *============================================================================*/
13771 PRIVATE int com_out(cmd)
13772 struct command *cmd; /* Command block */
13773 {
13774 /* Output the command block to the winchester controller and return status */
13775
13776 struct wini *wn = w_wn;
13777 unsigned base = wn->base;
13778
13779 if (!waitfor(STATUS_BSY, 0)) {
13780 printf("%s: controller not readyn", w_name());
13781 return(ERR);
13782 }
13783
13784 /* Select drive. */
13785 out_byte(base + REG_LDH, cmd->ldh);
13786
13787 if (!waitfor(STATUS_BSY, 0)) {
13788 printf("%s: drive not readyn", w_name());
13789 return(ERR);
.Op 167 src/kernel/at_wini.c
13790 }
13791
13792 /* Schedule a wakeup call, some controllers are flaky. */
13793 clock_mess(WAKEUP, w_timeout);
13794
13795 out_byte(base + REG_CTL, wn->pheads >= 8 ? CTL_EIGHTHEADS : 0);
13796 out_byte(base + REG_PRECOMP, cmd->precomp);
13797 out_byte(base + REG_COUNT, cmd->count);
13798 out_byte(base + REG_SECTOR, cmd->sector);
13799 out_byte(base + REG_CYL_LO, cmd->cyl_lo);
13800 out_byte(base + REG_CYL_HI, cmd->cyl_hi);
13801 lock();
13802 out_byte(base + REG_COMMAND, cmd->command);
13803 w_command = cmd->command;
13804 w_status = STATUS_BSY;
13805 unlock();
13806 return(OK);
13807 }
13810 /*===========================================================================*
13811 * w_need_reset *
13812 *===========================================================================*/
13813 PRIVATE void w_need_reset()
13814 {
13815 /* The controller needs to be reset. */
13816 struct wini *wn;
13817
13818 for (wn = wini; wn < &wini[MAX_DRIVES]; wn++) {
13819 wn->state |= DEAF;
13820 wn->state &= ~INITIALIZED;
13821 }
13822 }
13825 /*============================================================================*
13826 * w_do_close *
13827 *============================================================================*/
13828 PRIVATE int w_do_close(dp, m_ptr)
13829 struct driver *dp;
13830 message *m_ptr;
13831 {
13832 /* Device close: Release a device. */
13833
13834 if (w_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
13835 w_wn->open_ct--;
13836 return(OK);
13837 }
13840 /*============================================================================*
13841 * com_simple *
13842 *============================================================================*/
13843 PRIVATE int com_simple(cmd)
13844 struct command *cmd; /* Command block */
13845 {
13846 /* A simple controller command, only one interrupt and no data-out phase. */
13847 int r;
13848
13849 if ((r = com_out(cmd)) == OK) r = w_intr_wait();
.Ep 168 src/kernel/at_wini.c
13850 w_command = CMD_IDLE;
13851 return(r);
13852 }
13855 /*===========================================================================*
13856 * w_timeout *
13857 *===========================================================================*/
13858 PRIVATE void w_timeout()
13859 {
13860 struct wini *wn = w_wn;
13861
13862 switch (w_command) {
13863 case CMD_IDLE:
13864 break; /* fine */
13865 case CMD_READ:
13866 case CMD_WRITE:
13867 /* Impossible, but not on PC's: The controller does not respond. */
13868
13869 /* Limiting multisector I/O seems to help. */
13870 if (wn->max_count > 8 * SECTOR_SIZE) {
13871 wn->max_count = 8 * SECTOR_SIZE;
13872 } else {
13873 wn->max_count = SECTOR_SIZE;
13874 }
13875 /*FALL THROUGH*/
13876 default:
13877 /* Some other command. */
13878 printf("%s: timeout on command %02xn", w_name(), w_command);
13879 w_need_reset();
13880 w_status = 0;
13881 interrupt(WINCHESTER);
13882 }
13883 }
13886 /*===========================================================================*
13887 * w_reset *
13888 *===========================================================================*/
13889 PRIVATE int w_reset()
13890 {
13891 /* Issue a reset to the controller. This is done after any catastrophe,
13892 * like the controller refusing to respond.
13893 */
13894
13895 struct wini *wn;
13896 int err;
13897
13898 /* Wait for any internal drive recovery. */
13899 milli_delay(RECOVERYTIME);
13900
13901 /* Strobe reset bit */
13902 out_byte(w_wn->base + REG_CTL, CTL_RESET);
13903 milli_delay(1);
13904 out_byte(w_wn->base + REG_CTL, 0);
13905 milli_delay(1);
13906
13907 /* Wait for controller ready */
13908 if (!w_waitfor(STATUS_BSY | STATUS_RDY, STATUS_RDY)) {
13909 printf("%s: reset failed, drive busyn", w_name());
.Op 169 src/kernel/at_wini.c
13910 return(ERR);
13911 }
13912
13913 /* The error register should be checked now, but some drives mess it up. */
13914
13915 for (wn = wini; wn < &wini[MAX_DRIVES]; wn++) {
13916 if (wn->base == w_wn->base) wn->state &= ~DEAF;
13917 }
13918 return(OK);
13919 }
13922 /*============================================================================*
13923 * w_intr_wait *
13924 *============================================================================*/
13925 PRIVATE int w_intr_wait()
13926 {
13927 /* Wait for a task completion interrupt and return results. */
13928
13929 message mess;
13930 int r;
13931
13932 /* Wait for an interrupt that sets w_status to "not busy". */
13933 while (w_status & STATUS_BSY) receive(HARDWARE, &mess);
13934
13935 /* Check status. */
13936 lock();
13937 if ((w_status & (STATUS_BSY | STATUS_RDY | STATUS_WF | STATUS_ERR))
13938 == STATUS_RDY) {
13939 r = OK;
13940 w_status |= STATUS_BSY; /* assume still busy with I/O */
13941 } else
13942 if ((w_status & STATUS_ERR) && (in_byte(w_wn->base + REG_ERROR) & ERROR_BB)) {
13943 r = ERR_BAD_SECTOR; /* sector marked bad, retries won't help */
13944 } else {
13945 r = ERR; /* any other error */
13946 }
13947 unlock();
13948 return(r);
13949 }
13952 /*==========================================================================*
13953 * w_waitfor *
13954 *==========================================================================*/
13955 PRIVATE int w_waitfor(mask, value)
13956 int mask; /* status mask */
13957 int value; /* required status */
13958 {
13959 /* Wait until controller is in the required state. Return zero on timeout. */
13960
13961 struct milli_state ms;
13962
13963 milli_start(&ms);
13964 do {
13965 if ((in_byte(w_wn->base + REG_STATUS) & mask) == value) return 1;
13966 } while (milli_elapsed(&ms) < TIMEOUT);
13967
13968 w_need_reset(); /* Controller gone deaf. */
13969 return(0);
.Ep 170 src/kernel/at_wini.c
13970 }
13973 /*==========================================================================*
13974 * w_handler *
13975 *==========================================================================*/
13976 PRIVATE int w_handler(irq)
13977 int irq;
13978 {
13979 /* Disk interrupt, send message to winchester task and reenable interrupts. */
13980
13981 w_status = in_byte(w_wn->base + REG_STATUS); /* acknowledge interrupt */
13982 interrupt(WINCHESTER);
13983 return 1;
13984 }
13987 /*============================================================================*
13988 * w_geometry *
13989 *============================================================================*/
13990 PRIVATE void w_geometry(entry)
13991 struct partition *entry;
13992 {
13993 entry->cylinders = w_wn->lcylinders;
13994 entry->heads = w_wn->lheads;
13995 entry->sectors = w_wn->lsectors;
13996 }
13997 #endif /* ENABLE_AT_WINI */
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/bios_wini.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
14000 /* This file contains the "device dependent" part of a hard disk driver that
14001 * uses the ROM BIOS. It makes a call and just waits for the transfer to
14002 * happen. It is not interrupt driven and thus will (*) have poor performance.
14003 * The advantage is that it should work on virtually any PC, XT, 386, PS/2
14004 * or clone. The demo disk uses this driver. It is suggested that all
14005 * MINIX users try the other drivers, and use this one only as a last resort,
14006 * if all else fails.
14007 *
14008 * (*) The performance is within 10% of the AT driver for reads on any disk
14009 * and writes on a 2:1 interleaved disk, it will be DMA_BUF_SIZE bytes
14010 * per revolution for a minimum of 60 kb/s for writes to 1:1 disks.
14011 *
14012 * The file contains one entry point:
14013 *
14014 * bios_winchester_task: main entry when system is brought up
14015 *
14016 *
14017 * Changes:
14018 * 30 Apr 1992 by Kees J. Bot: device dependent/independent split.
14019 */
14020
14021 #include "kernel.h"
14022 #include "driver.h"
14023 #include "drvlib.h"
14024
.Op 171 src/kernel/bios_wini.c
14025 #if ENABLE_BIOS_WINI
14026
14027 /* If the DMA buffer is large enough then use it always. */
14028 #define USE_BUF (DMA_BUF_SIZE > BLOCK_SIZE)
14029
14030 /* Error codes */
14031 #define ERR (-1) /* general error */
14032
14033 /* Parameters for the disk drive. */
14034 #define MAX_DRIVES 4 /* this driver supports 4 drives (hd0 - hd19)*/
14035 #define MAX_SECS 255 /* bios can transfer this many sectors */
14036 #define NR_DEVICES (MAX_DRIVES * DEV_PER_DRIVE)
14037 #define SUB_PER_DRIVE (NR_PARTITIONS * NR_PARTITIONS)
14038 #define NR_SUBDEVS (MAX_DRIVES * SUB_PER_DRIVE)
14039
14040 /* BIOS parameters */
14041 #define BIOS_ASK 0x08 /* opcode for asking BIOS for parameters */
14042 #define BIOS_RESET 0x00 /* opcode for resetting disk BIOS */
14043 #define BIOS_READ 0x02 /* opcode for BIOS read */
14044 #define BIOS_WRITE 0x03 /* opcode for BIOS write */
14045 #define HD_CODE 0x80 /* BIOS code for hard disk drive 0 */
14046
14047 /* Variables. */
14048 PRIVATE struct wini { /* main drive struct, one entry per drive */
14049 unsigned cylinders; /* number of cylinders */
14050 unsigned heads; /* number of heads */
14051 unsigned sectors; /* number of sectors per track */
14052 unsigned open_ct; /* in-use count */
14053 struct device part[DEV_PER_DRIVE]; /* primary partitions: hd[0-4] */
14054 struct device subpart[SUB_PER_DRIVE]; /* subpartitions: hd[1-4][a-d] */
14055 } wini[MAX_DRIVES], *w_wn;
14056
14057 PRIVATE struct trans {
14058 struct iorequest_s *iop; /* belongs to this I/O request */
14059 unsigned long block; /* first sector to transfer */
14060 unsigned count; /* byte count */
14061 phys_bytes phys; /* user physical address */
14062 phys_bytes dma; /* DMA physical address */
14063 } wtrans[NR_IOREQS];
14064
14065 PRIVATE int nr_drives = MAX_DRIVES; /* Number of drives */
14066 PRIVATE struct trans *w_tp; /* to add transfer requests */
14067 PRIVATE unsigned w_count; /* number of bytes to transfer */
14068 PRIVATE unsigned long w_nextblock; /* next block on disk to transfer */
14069 PRIVATE int w_opcode; /* DEV_READ or DEV_WRITE */
14070 PRIVATE int w_drive; /* selected drive */
14071 PRIVATE struct device *w_dv; /* device's base and size */
14072 extern unsigned Ax, Bx, Cx, Dx, Es; /* to hold registers for BIOS calls */
14073
14074 FORWARD _PROTOTYPE( struct device *w_prepare, (int device) );
14075 FORWARD _PROTOTYPE( char *w_name, (void) );
14076 FORWARD _PROTOTYPE( int w_schedule, (int proc_nr, struct iorequest_s *iop) );
14077 FORWARD _PROTOTYPE( int w_finish, (void) );
14078 FORWARD _PROTOTYPE( int w_do_open, (struct driver *dp, message *m_ptr) );
14079 FORWARD _PROTOTYPE( int w_do_close, (struct driver *dp, message *m_ptr) );
14080 FORWARD _PROTOTYPE( void w_init, (void) );
14081 FORWARD _PROTOTYPE( void enable_vectors, (void) );
14082 FORWARD _PROTOTYPE( void w_geometry, (struct partition *entry));
14083
14084
.Ep 172 src/kernel/bios_wini.c
14085 /* Entry points to this driver. */
14086 PRIVATE struct driver w_dtab = {
14087 w_name, /* current device's name */
14088 w_do_open, /* open or mount request, initialize device */
14089 w_do_close, /* release device */
14090 do_diocntl, /* get or set a partition's geometry */
14091 w_prepare, /* prepare for I/O on a given minor device */
14092 w_schedule, /* precompute cylinder, head, sector, etc. */
14093 w_finish, /* do the I/O */
14094 nop_cleanup, /* no cleanup needed */
14095 w_geometry /* tell the geometry of the disk */
14096 };
14097
14098
14099 /*===========================================================================*
14100 * bios_winchester_task *
14101 *===========================================================================*/
14102 PUBLIC void bios_winchester_task()
14103 {
14104 driver_task(&w_dtab);
14105 }
14108 /*===========================================================================*
14109 * w_prepare *
14110 *===========================================================================*/
14111 PRIVATE struct device *w_prepare(device)
14112 int device;
14113 {
14114 /* Prepare for I/O on a device. */
14115
14116 /* Nothing to transfer as yet. */
14117 w_count = 0;
14118
14119 if (device < NR_DEVICES) { /* hd0, hd1, ... */
14120 w_drive = device / DEV_PER_DRIVE; /* save drive number */
14121 w_wn = &wini[w_drive];
14122 w_dv = &w_wn->part[device % DEV_PER_DRIVE];
14123 } else
14124 if ((unsigned) (device -= MINOR_hd1a) < NR_SUBDEVS) { /* hd1a, hd1b, ... */
14125 w_drive = device / SUB_PER_DRIVE;
14126 w_wn = &wini[w_drive];
14127 w_dv = &w_wn->subpart[device % SUB_PER_DRIVE];
14128 } else {
14129 return(NIL_DEV);
14130 }
14131 return(w_drive < nr_drives ? w_dv : NIL_DEV);
14132 }
14135 /*===========================================================================*
14136 * w_name *
14137 *===========================================================================*/
14138 PRIVATE char *w_name()
14139 {
14140 /* Return a name for the current device. */
14141 static char name[] = "bios-hd5";
14142
14143 name[7] = '0' + w_drive * DEV_PER_DRIVE;
14144 return name;
.Op 173 src/kernel/bios_wini.c
14145 }
14148 /*===========================================================================*
14149 * w_schedule *
14150 *===========================================================================*/
14151 PRIVATE int w_schedule(proc_nr, iop)
14152 int proc_nr; /* process doing the request */
14153 struct iorequest_s *iop; /* pointer to read or write request */
14154 {
14155 /* Gather I/O requests on consecutive blocks so they may be read/written
14156 * in one bios command if using a buffer. Check and gather all the requests
14157 * and try to finish them as fast as possible if unbuffered.
14158 */
14159 int r, opcode;
14160 unsigned long pos;
14161 unsigned nbytes, count, dma_count;
14162 unsigned long block;
14163 phys_bytes user_phys, dma_phys;
14164
14165 /* This many bytes to read/write */
14166 nbytes = iop->io_nbytes;
14167 if ((nbytes & SECTOR_MASK) != 0) return(iop->io_nbytes = EINVAL);
14168
14169 /* From/to this position on the device */
14170 pos = iop->io_position;
14171 if ((pos & SECTOR_MASK) != 0) return(iop->io_nbytes = EINVAL);
14172
14173 /* To/from this user address */
14174 user_phys = numap(proc_nr, (vir_bytes) iop->io_buf, nbytes);
14175 if (user_phys == 0) return(iop->io_nbytes = EINVAL);
14176
14177 /* Read or write? */
14178 opcode = iop->io_request & ~OPTIONAL_IO;
14179
14180 /* Which block on disk and how close to EOF? */
14181 if (pos >= w_dv->dv_size) return(OK); /* At EOF */
14182 if (pos + nbytes > w_dv->dv_size) nbytes = w_dv->dv_size - pos;
14183 block = (w_dv->dv_base + pos) >> SECTOR_SHIFT;
14184
14185 if (USE_BUF && w_count > 0 && block != w_nextblock) {
14186 /* This new request can't be chained to the job being built */
14187 if ((r = w_finish()) != OK) return(r);
14188 }
14189
14190 /* The next consecutive block */
14191 if (USE_BUF) w_nextblock = block + (nbytes >> SECTOR_SHIFT);
14192
14193 /* While there are "unscheduled" bytes in the request: */
14194 do {
14195 count = nbytes;
14196
14197 if (USE_BUF) {
14198 if (w_count == DMA_BUF_SIZE) {
14199 /* Can't transfer more than the buffer allows. */
14200 if ((r = w_finish()) != OK) return(r);
14201 }
14202
14203 if (w_count + count > DMA_BUF_SIZE)
14204 count = DMA_BUF_SIZE - w_count;
.Ep 174 src/kernel/bios_wini.c
14205 } else {
14206 if (w_tp == wtrans + NR_IOREQS) {
14207 /* All transfer slots in use. */
14208 if ((r = w_finish()) != OK) return(r);
14209 }
14210 }
14211
14212 if (w_count == 0) {
14213 /* The first request in a row, initialize. */
14214 w_opcode = opcode;
14215 w_tp = wtrans;
14216 }
14217
14218 if (USE_BUF) {
14219 dma_phys = tmp_phys + w_count;
14220 } else {
14221 /* Memory chunk to DMA. */
14222 dma_phys = user_phys;
14223 dma_count = dma_bytes_left(dma_phys);
14224
14225 if (dma_phys >= (1L << 20)) {
14226 /* The BIOS can only address the first megabyte. */
14227 count = SECTOR_SIZE;
14228 dma_phys = tmp_phys;
14229 } else
14230 if (dma_count < count) {
14231 /* Nearing a 64K boundary. */
14232 if (dma_count >= SECTOR_SIZE) {
14233 /* Can read a few sectors before hitting the
14234 * boundary.
14235 */
14236 count = dma_count & ~SECTOR_MASK;
14237 } else {
14238 /* Must use the special buffer for this. */
14239 count = SECTOR_SIZE;
14240 dma_phys = tmp_phys;
14241 }
14242 }
14243 }
14244
14245 /* Store I/O parameters */
14246 w_tp->iop = iop;
14247 w_tp->block = block;
14248 w_tp->count = count;
14249 w_tp->phys = user_phys;
14250 w_tp->dma = dma_phys;
14251
14252 /* Update counters */
14253 w_tp++;
14254 w_count += count;
14255 block += count >> SECTOR_SHIFT;
14256 user_phys += count;
14257 nbytes -= count;
14258 } while (nbytes > 0);
14259
14260 return(OK);
14261 }
14264 /*===========================================================================*
.Op 175 src/kernel/bios_wini.c
14265 * w_finish *
14266 *===========================================================================*/
14267 PRIVATE int w_finish()
14268 {
14269 /* Carry out the I/O requests gathered in wtrans[]. */
14270
14271 struct trans *tp = wtrans, *tp2;
14272 unsigned count, cylinder, sector, head, hicyl, locyl;
14273 unsigned secspcyl = w_wn->heads * w_wn->sectors;
14274 int many = USE_BUF;
14275
14276 if (w_count == 0) return(OK); /* Spurious finish. */
14277
14278 do {
14279 if (w_opcode == DEV_WRITE) {
14280 tp2 = tp;
14281 count = 0;
14282 do {
14283 if (USE_BUF || tp2->dma == tmp_phys) {
14284 phys_copy(tp2->phys, tp2->dma,
14285 (phys_bytes) tp2->count);
14286 }
14287 count += tp2->count;
14288 tp2++;
14289 } while (many && count < w_count);
14290 } else {
14291 count = many ? w_count : tp->count;
14292 }
14293
14294 /* Do the transfer */
14295 cylinder = tp->block / secspcyl;
14296 sector = (tp->block % w_wn->sectors) + 1;
14297 head = (tp->block % secspcyl) / w_wn->sectors;
14298
14299 Ax = w_opcode == DEV_WRITE ? BIOS_WRITE : BIOS_READ;
14300 Ax = (Ax << 8) | (count >> SECTOR_SHIFT); /* opcode & count */
14301 Bx = (unsigned) tp->dma % HCLICK_SIZE; /* low order 4 bits */
14302 Es = physb_to_hclick(tp->dma); /* high order 16 bits */
14303 hicyl = (cylinder & 0x300) >> 8; /* two high-order bits */
14304 locyl = (cylinder & 0xFF); /* 8 low-order bits */
14305 Cx = sector | (hicyl << 6) | (locyl << 8);
14306 Dx = (HD_CODE + w_drive) | (head << 8);
14307 level0(bios13);
14308 if ((Ax & 0xFF00) != 0) {
14309 /* An error occurred, try again block by block unless */
14310 if (!many) return(tp->iop->io_nbytes = EIO);
14311 many = 0;
14312 continue;
14313 }
14314
14315 w_count -= count;
14316
14317 do {
14318 if (w_opcode == DEV_READ) {
14319 if (USE_BUF || tp->dma == tmp_phys) {
14320 phys_copy(tp->dma, tp->phys,
14321 (phys_bytes) tp->count);
14322 }
14323 }
14324 tp->iop->io_nbytes -= tp->count;
.Ep 176 src/kernel/bios_wini.c
14325 count -= tp->count;
14326 tp++;
14327 } while (count > 0);
14328 } while (w_count > 0);
14329
14330 return(OK);
14331 }
14334 /*============================================================================*
14335 * w_do_open *
14336 *============================================================================*/
14337 PRIVATE int w_do_open(dp, m_ptr)
14338 struct driver *dp;
14339 message *m_ptr;
14340 {
14341 /* Device open: Initialize the controller and read the partition table. */
14342
14343 static int init_done = FALSE;
14344
14345 if (!init_done) { w_init(); init_done = TRUE; }
14346
14347 if (w_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
14348
14349 if (w_wn->open_ct++ == 0) {
14350 /* Partition the disk. */
14351 partition(&w_dtab, w_drive * DEV_PER_DRIVE, P_PRIMARY);
14352 }
14353 return(OK);
14354 }
14357 /*============================================================================*
14358 * w_do_close *
14359 *============================================================================*/
14360 PRIVATE int w_do_close(dp, m_ptr)
14361 struct driver *dp;
14362 message *m_ptr;
14363 {
14364 /* Device close: Release a device. */
14365
14366 if (w_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
14367 w_wn->open_ct--;
14368 return(OK);
14369 }
14372 /*===========================================================================*
14373 * w_init *
14374 *===========================================================================*/
14375 PRIVATE void w_init()
14376 {
14377 /* This routine is called at startup to initialize the drive parameters. */
14378
14379 int drive;
14380 struct wini *wn;
14381
14382 /* Enable real mode BIOS vectors. */
14383 enable_vectors();
14384
.Op 177 src/kernel/bios_wini.c
14385 /* Set the geometry of the drives */
14386 for (drive = 0; drive < nr_drives; drive++) {
14387 (void) w_prepare(drive * DEV_PER_DRIVE);
14388 wn = w_wn;
14389 Dx = drive + HD_CODE;
14390 Ax = (BIOS_ASK << 8);
14391 level0(bios13);
14392 nr_drives = (Ax & 0xFF00) == 0 ? (Dx & 0xFF) : drive;
14393 if (nr_drives > MAX_DRIVES) nr_drives = MAX_DRIVES;
14394 if (drive >= nr_drives) break;
14395
14396 wn->heads = (Dx >> 8) + 1;
14397 wn->sectors = (Cx & 0x3F);
14398 wn->cylinders = ((Cx << 2) & 0x0300) + ((Cx >> 8) & 0x00FF) + 1;
14399
14400 wn->part[0].dv_size = ((unsigned long) wn->cylinders
14401 * wn->heads * wn->sectors) << SECTOR_SHIFT;
14402
14403 printf("%s: %d cylinders, %d heads, %d sectors per trackn",
14404 w_name(), wn->cylinders, wn->heads, wn->sectors);
14405 }
14406 }
14409 /*===========================================================================*
14410 * enable_vectors *
14411 *===========================================================================*/
14412 PRIVATE void enable_vectors()
14413 {
14414 /* Protected mode Minix has reprogrammed the interrupt controllers to
14415 * use different vectors from the BIOS. This means that the BIOS vectors
14416 * must be copied to the Minix locations for use in real mode. The bios13()
14417 * function enables all interrupts that Minix doesn't use, and masks all
14418 * interrupts that Minix does use when it makes the "INT 13" call. Alas
14419 * more than one clock tick may occur while the disk is active, so we need
14420 * a special real mode clock interrupt handle to gather lost ticks.
14421 */
14422
14423 int vec, irq;
14424 static u8_t clock_handler[] = {
14425 0x50, 0xB0, 0x20, 0xE6, 0x20, 0xEB, 0x06, 0xE4,
14426 0x61, 0x0C, 0x80, 0xE6, 0x61, 0x58, 0x53, 0x1E,
14427 0xE8, 0x00, 0x00, 0x5B, 0x2E, 0xC5, 0x5F, 0x0A,
14428 0xFF, 0x07, 0x1F, 0x5B, 0xCF,
14429 0x00, 0x00, 0x00, 0x00,
14430 };
14431 u16_t vector[2];
14432
14433 if (!protected_mode) return;
14434
14435 for (irq = 0; irq < NR_IRQ_VECTORS; irq++) {
14436 phys_copy(BIOS_VECTOR(irq)*4L, VECTOR(irq)*4L, 4L);
14437 }
14438
14439 /* Install a clock interrupt handler to collect clock ticks when the
14440 * BIOS disk driver is active. The handler is a simple bit of 8086 code
14441 * that increments "lost_ticks".
14442 */
14443
14444 /* Let the clock interrupt point to the handler. */
.Ep 178 src/kernel/bios_wini.c
14445 vector[0] = vir2phys(clock_handler) % HCLICK_SIZE;
14446 vector[1] = vir2phys(clock_handler) / HCLICK_SIZE;
14447 phys_copy(vir2phys(vector), VECTOR(CLOCK_IRQ)*4L, 4L);
14448
14449 /* Store the address of lost_ticks in the handler. */
14450 vector[0] = vir2phys(&lost_ticks) % HCLICK_SIZE;
14451 vector[1] = vir2phys(&lost_ticks) / HCLICK_SIZE;
14452 memcpy(clock_handler + 0x1D, vector, 4);
14453
14454 if (ps_mca) clock_handler[6]= 0; /* (PS/2 port B clock ack) */
14455 }
14458 /*============================================================================*
14459 * w_geometry *
14460 *============================================================================*/
14461 PRIVATE void w_geometry(entry)
14462 struct partition *entry;
14463 {
14464 entry->cylinders = w_wn->cylinders;
14465 entry->heads = w_wn->heads;
14466 entry->sectors = w_wn->sectors;
14467 }
14468 #endif /* ENABLE_BIOS_WINI */
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/clock.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
14500 /* This file contains the code and data for the clock task. The clock task
14501 * accepts six message types:
14502 *
14503 * HARD_INT: a clock interrupt has occurred
14504 * GET_UPTIME: get the time since boot in ticks
14505 * GET_TIME: a process wants the real time in seconds
14506 * SET_TIME: a process wants to set the real time in seconds
14507 * SET_ALARM: a process wants to be alerted after a specified interval
14508 * SET_SYN_AL: set the sync alarm
14509 *
14510 *
14511 * The input message is format m6. The parameters are as follows:
14512 *
14513 * m_type CLOCK_PROC FUNC NEW_TIME
14514 * ---------------------------------------------
14515 * | HARD_INT | | | |
14516 * |------------+----------+---------+---------|
14517 * | GET_UPTIME | | | |
14518 * |------------+----------+---------+---------|
14519 * | GET_TIME | | | |
14520 * |------------+----------+---------+---------|
14521 * | SET_TIME | | | newtime |
14522 * |------------+----------+---------+---------|
14523 * | SET_ALARM | proc_nr |f to call| delta |
14524 * |------------+----------+---------+---------|
14525 * | SET_SYN_AL | proc_nr | | delta |
14526 * ---------------------------------------------
14527 * NEW_TIME, DELTA_CLICKS, and SECONDS_LEFT all refer to the same field in
14528 * the message, depending upon the message type.
14529 *
.Op 179 src/kernel/clock.c
14530 * Reply messages are of type OK, except in the case of a HARD_INT, to
14531 * which no reply is generated. For the GET_* messages the time is returned
14532 * in the NEW_TIME field, and for the SET_ALARM and SET_SYN_AL the time
14533 * in seconds remaining until the alarm is returned is returned in the same
14534 * field.
14535 *
14536 * When an alarm goes off, if the caller is a user process, a SIGALRM signal
14537 * is sent to it. If it is a task, a function specified by the caller will
14538 * be invoked. This function may, for example, send a message, but only if
14539 * it is certain that the task will be blocked when the timer goes off. A
14540 * synchronous alarm sends a message to the synchronous alarm task, which
14541 * in turn can dispatch a message to another server. This is the only way
14542 * to send an alarm to a server, since servers cannot use the function-call
14543 * mechanism available to tasks and servers cannot receive signals.
14544 */
14545
14546 #include "kernel.h"
14547 #include <signal.h>
14548 #include <minix/callnr.h>
14549 #include <minix/com.h>
14550 #include "proc.h"
14551
14552 /* Constant definitions. */
14553 #define MILLISEC 100 /* how often to call the scheduler (msec) */
14554 #define SCHED_RATE (MILLISEC*HZ/1000) /* number of ticks per schedule */
14555
14556 /* Clock parameters. */
14557 #if (CHIP == INTEL)
14558 #define COUNTER_FREQ (2*TIMER_FREQ) /* counter frequency using sqare wave*/
14559 #define LATCH_COUNT 0x00 /* cc00xxxx, c = channel, x = any */
14560 #define SQUARE_WAVE 0x36 /* ccaammmb, a = access, m = mode, b = BCD */
14561 /* 11x11, 11 = LSB then MSB, x11 = sq wave */
14562 #define TIMER_COUNT ((unsigned) (TIMER_FREQ/HZ)) /* initial value for counter*/
14563 #define TIMER_FREQ 1193182L /* clock frequency for timer in PC and AT */
14564
14565 #define CLOCK_ACK_BIT 0x80 /* PS/2 clock interrupt acknowledge bit */
14566 #endif
14567
14568 #if (CHIP == M68000)
14569 #define TIMER_FREQ 2457600L /* timer 3 input clock frequency */
14570 #endif
14571
14572 /* Clock task variables. */
14573 PRIVATE clock_t realtime; /* real time clock */
14574 PRIVATE time_t boot_time; /* time in seconds of system boot */
14575 PRIVATE clock_t next_alarm; /* probable time of next alarm */
14576 PRIVATE message mc; /* message buffer for both input and output */
14577 PRIVATE int watchdog_proc; /* contains proc_nr at call of *watch_dog[]*/
14578 PRIVATE watchdog_t watch_dog[NR_TASKS+NR_PROCS];
14579
14580 /* Variables used by both clock task and synchronous alarm task */
14581 PRIVATE int syn_al_alive= TRUE; /* don't wake syn_alrm_task before inited*/
14582 PRIVATE int syn_table[NR_TASKS+NR_PROCS]; /* which tasks get CLOCK_INT*/
14583
14584 /* Variables changed by interrupt handler */
14585 PRIVATE clock_t pending_ticks; /* ticks seen by low level only */
14586 PRIVATE int sched_ticks = SCHED_RATE; /* counter: when 0, call scheduler */
14587 PRIVATE struct proc *prev_ptr; /* last user process run by clock task */
14588
14589 FORWARD _PROTOTYPE( void common_setalarm, (int proc_nr,
.Ep 180 src/kernel/clock.c
14590 long delta_ticks, watchdog_t fuction) );
14591 FORWARD _PROTOTYPE( void do_clocktick, (void) );
14592 FORWARD _PROTOTYPE( void do_get_time, (void) );
14593 FORWARD _PROTOTYPE( void do_getuptime, (void) );
14594 FORWARD _PROTOTYPE( void do_set_time, (message *m_ptr) );
14595 FORWARD _PROTOTYPE( void do_setalarm, (message *m_ptr) );
14596 FORWARD _PROTOTYPE( void init_clock, (void) );
14597 FORWARD _PROTOTYPE( void cause_alarm, (void) );
14598 FORWARD _PROTOTYPE( void do_setsyn_alrm, (message *m_ptr) );
14599 FORWARD _PROTOTYPE( int clock_handler, (int irq) );
14600
14601 /*===========================================================================*
14602 * clock_task *
14603 *===========================================================================*/
14604 PUBLIC void clock_task()
14605 {
14606 /* Main program of clock task. It corrects realtime by adding pending
14607 * ticks seen only by the interrupt service, then it determines which
14608 * of the 6 possible calls this is by looking at 'mc.m_type'. Then
14609 * it dispatches.
14610 */
14611
14612 int opcode;
14613
14614 init_clock(); /* initialize clock task */
14615
14616 /* Main loop of the clock task. Get work, process it, sometimes reply. */
14617 while (TRUE) {
14618 receive(ANY, &mc); /* go get a message */
14619 opcode = mc.m_type; /* extract the function code */
14620
14621 lock();
14622 realtime += pending_ticks; /* transfer ticks from low level handler */
14623 pending_ticks = 0; /* so we don't have to worry about them */
14624 unlock();
14625
14626 switch (opcode) {
14627 case HARD_INT: do_clocktick(); break;
14628 case GET_UPTIME: do_getuptime(); break;
14629 case GET_TIME: do_get_time(); break;
14630 case SET_TIME: do_set_time(&mc); break;
14631 case SET_ALARM: do_setalarm(&mc); break;
14632 case SET_SYNC_AL:do_setsyn_alrm(&mc); break;
14633 default: panic("clock task got bad message", mc.m_type);
14634 }
14635
14636 /* Send reply, except for clock tick. */
14637 mc.m_type = OK;
14638 if (opcode != HARD_INT) send(mc.m_source, &mc);
14639 }
14640 }
14643 /*===========================================================================*
14644 * do_clocktick *
14645 *===========================================================================*/
14646 PRIVATE void do_clocktick()
14647 {
14648 /* Despite its name, this routine is not called on every clock tick. It
14649 * is called on those clock ticks when a lot of work needs to be done.
.Op 181 src/kernel/clock.c
14650 */
14651
14652 register struct proc *rp;
14653 register int proc_nr;
14654
14655 if (next_alarm <= realtime) {
14656 /* An alarm may have gone off, but proc may have exited, so check. */
14657 next_alarm = LONG_MAX; /* start computing next alarm */
14658 for (rp = BEG_PROC_ADDR; rp < END_PROC_ADDR; rp++) {
14659 if (rp->p_alarm != 0) {
14660 /* See if this alarm time has been reached. */
14661 if (rp->p_alarm <= realtime) {
14662 /* A timer has gone off. If it is a user proc,
14663 * send it a signal. If it is a task, call the
14664 * function previously specified by the task.
14665 */
14666 proc_nr = proc_number(rp);
14667 if (watch_dog[proc_nr+NR_TASKS]) {
14668 watchdog_proc= proc_nr;
14669 (*watch_dog[proc_nr+NR_TASKS])();
14670 }
14671 else
14672 cause_sig(proc_nr, SIGALRM);
14673 rp->p_alarm = 0;
14674 }
14675
14676 /* Work on determining which alarm is next. */
14677 if (rp->p_alarm != 0 && rp->p_alarm < next_alarm)
14678 next_alarm = rp->p_alarm;
14679 }
14680 }
14681 }
14682
14683 /* If a user process has been running too long, pick another one. */
14684 if (--sched_ticks == 0) {
14685 if (bill_ptr == prev_ptr) lock_sched(); /* process has run too long */
14686 sched_ticks = SCHED_RATE; /* reset quantum */
14687 prev_ptr = bill_ptr; /* new previous process */
14688 }
14689 #if (SHADOWING == 1)
14690 if (rdy_head[SHADOW_Q]) unshadow(rdy_head[SHADOW_Q]);
14691 #endif
14692 }
14695 /*===========================================================================*
14696 * do_getuptime *
14697 *===========================================================================*/
14698 PRIVATE void do_getuptime()
14699 {
14700 /* Get and return the current clock uptime in ticks. */
14701
14702 mc.NEW_TIME = realtime; /* current uptime */
14703 }
14706 /*===========================================================================*
14707 * get_uptime *
14708 *===========================================================================*/
14709 PUBLIC clock_t get_uptime()
.Ep 182 src/kernel/clock.c
14710 {
14711 /* Get and return the current clock uptime in ticks. This function is
14712 * designed to be called from other tasks, so they can get uptime without
14713 * the overhead of messages. It has to be careful about pending_ticks.
14714 */
14715
14716 clock_t uptime;
14717
14718 lock();
14719 uptime = realtime + pending_ticks;
14720 unlock();
14721 return(uptime);
14722 }
14725 /*===========================================================================*
14726 * do_get_time *
14727 *===========================================================================*/
14728 PRIVATE void do_get_time()
14729 {
14730 /* Get and return the current clock time in seconds. */
14731
14732 mc.NEW_TIME = boot_time + realtime/HZ; /* current real time */
14733 }
14736 /*===========================================================================*
14737 * do_set_time *
14738 *===========================================================================*/
14739 PRIVATE void do_set_time(m_ptr)
14740 message *m_ptr; /* pointer to request message */
14741 {
14742 /* Set the real time clock. Only the superuser can use this call. */
14743
14744 boot_time = m_ptr->NEW_TIME - realtime/HZ;
14745 }
14748 /*===========================================================================*
14749 * do_setalarm *
14750 *===========================================================================*/
14751 PRIVATE void do_setalarm(m_ptr)
14752 message *m_ptr; /* pointer to request message */
14753 {
14754 /* A process wants an alarm signal or a task wants a given watch_dog function
14755 * called after a specified interval.
14756 */
14757
14758 register struct proc *rp;
14759 int proc_nr; /* which process wants the alarm */
14760 long delta_ticks; /* in how many clock ticks does he want it? */
14761 watchdog_t function; /* function to call (tasks only) */
14762
14763 /* Extract the parameters from the message. */
14764 proc_nr = m_ptr->CLOCK_PROC_NR; /* process to interrupt later */
14765 delta_ticks = m_ptr->DELTA_TICKS; /* how many ticks to wait */
14766 function = (watchdog_t) m_ptr->FUNC_TO_CALL;
14767 /* function to call (tasks only) */
14768 rp = proc_addr(proc_nr);
14769 mc.SECONDS_LEFT = (rp->p_alarm == 0 ? 0 : (rp->p_alarm - realtime)/HZ );
.Op 183 src/kernel/clock.c
14770 if (!istaskp(rp)) function= 0; /* user processes get signaled */
14771 common_setalarm(proc_nr, delta_ticks, function);
14772 }
14775 /*===========================================================================*
14776 * do_setsyn_alrm *
14777 *===========================================================================*/
14778 PRIVATE void do_setsyn_alrm(m_ptr)
14779 message *m_ptr; /* pointer to request message */
14780 {
14781 /* A process wants a synchronous alarm.
14782 */
14783
14784 register struct proc *rp;
14785 int proc_nr; /* which process wants the alarm */
14786 long delta_ticks; /* in how many clock ticks does he want it? */
14787
14788 /* Extract the parameters from the message. */
14789 proc_nr = m_ptr->CLOCK_PROC_NR; /* process to interrupt later */
14790 delta_ticks = m_ptr->DELTA_TICKS; /* how many ticks to wait */
14791 rp = proc_addr(proc_nr);
14792 mc.SECONDS_LEFT = (rp->p_alarm == 0 ? 0 : (rp->p_alarm - realtime)/HZ );
14793 common_setalarm(proc_nr, delta_ticks, cause_alarm);
14794 }
14797 /*===========================================================================*
14798 * common_setalarm *
14799 *===========================================================================*/
14800 PRIVATE void common_setalarm(proc_nr, delta_ticks, function)
14801 int proc_nr; /* which process wants the alarm */
14802 long delta_ticks; /* in how many clock ticks does he want it? */
14803 watchdog_t function; /* function to call (0 if cause_sig is
14804 * to be called */
14805 {
14806 /* Finish up work of do_set_alarm and do_setsyn_alrm. Record an alarm
14807 * request and check to see if it is the next alarm needed.
14808 */
14809
14810 register struct proc *rp;
14811
14812 rp = proc_addr(proc_nr);
14813 rp->p_alarm = (delta_ticks == 0 ? 0 : realtime + delta_ticks);
14814 watch_dog[proc_nr+NR_TASKS] = function;
14815
14816 /* Which alarm is next? */
14817 next_alarm = LONG_MAX;
14818 for (rp = BEG_PROC_ADDR; rp < END_PROC_ADDR; rp++)
14819 if(rp->p_alarm != 0 && rp->p_alarm < next_alarm)next_alarm=rp->p_alarm;
14820
14821 }
14824 /*===========================================================================*
14825 * cause_alarm *
14826 *===========================================================================*/
14827 PRIVATE void cause_alarm()
14828 {
14829 /* Routine called if a timer goes off and the process requested a synchronous
.Ep 184 src/kernel/clock.c
14830 * alarm. The process number is in the global variable watchdog_proc (HACK).
14831 */
14832 message mess;
14833
14834 syn_table[watchdog_proc + NR_TASKS]= TRUE;
14835 if (!syn_al_alive) send (SYN_ALRM_TASK, &mess);
14836 }
14839 /*===========================================================================*
14840 * syn_alrm_task *
14841 *===========================================================================*/
14842 PUBLIC void syn_alrm_task()
14843 {
14844 /* Main program of the synchronous alarm task.
14845 * This task receives messages only from cause_alarm in the clock task.
14846 * It sends a CLOCK_INT message to a process that requested a syn_alrm.
14847 * Synchronous alarms are so called because, unlike a signals or the
14848 * activation of a watchdog, a synchronous alarm is received by a process
14849 * when it is in a known part of its code, that is, when it has issued
14850 * a call to receive a message.
14851 */
14852
14853 message mess;
14854 int work_done; /* ready to sleep ? */
14855 int *al_ptr; /* pointer in syn_table */
14856 int i;
14857
14858 syn_al_alive= TRUE;
14859 for (i= 0, al_ptr= syn_table; i<NR_TASKS+NR_PROCS; i++, al_ptr++)
14860 *al_ptr= FALSE;
14861
14862 while (TRUE) {
14863 work_done= TRUE;
14864 for (i= 0, al_ptr= syn_table; i<NR_TASKS+NR_PROCS; i++, al_ptr++)
14865 if (*al_ptr) {
14866 *al_ptr= FALSE;
14867 mess.m_type= CLOCK_INT;
14868 send (i-NR_TASKS, &mess);
14869 work_done= FALSE;
14870 }
14871 if (work_done) {
14872 syn_al_alive= FALSE;
14873 receive (CLOCK, &mess);
14874 syn_al_alive= TRUE;
14875 }
14876 }
14877 }
14880 /*===========================================================================*
14881 * clock_handler *
14882 *===========================================================================*/
14883 PRIVATE int clock_handler(irq)
14884 int irq;
14885 {
14886 /* This executes on every clock tick (i.e., every time the timer chip
14887 * generates an interrupt). It does a little bit of work so the clock
14888 * task does not have to be called on every tick.
14889 *
.Op 185 src/kernel/clock.c
14890 * Switch context to do_clocktick if an alarm has gone off.
14891 * Also switch there to reschedule if the reschedule will do something.
14892 * This happens when
14893 * (1) quantum has expired
14894 * (2) current process received full quantum (as clock sampled it!)
14895 * (3) something else is ready to run.
14896 * Also call TTY and PRINTER and let them do whatever is necessary.
14897 *
14898 * Many global global and static variables are accessed here. The safety
14899 * of this must be justified. Most of them are not changed here:
14900 * k_reenter:
14901 * This safely tells if the clock interrupt is nested.
14902 * proc_ptr, bill_ptr:
14903 * These are used for accounting. It does not matter if proc.c
14904 * is changing them, provided they are always valid pointers,
14905 * since at worst the previous process would be billed.
14906 * next_alarm, realtime, sched_ticks, bill_ptr, prev_ptr,
14907 * rdy_head[USER_Q]:
14908 * These are tested to decide whether to call interrupt(). It
14909 * does not matter if the test is sometimes (rarely) backwards
14910 * due to a race, since this will only delay the high-level
14911 * processing by one tick, or call the high level unnecessarily.
14912 * The variables which are changed require more care:
14913 * rp->user_time, rp->sys_time:
14914 * These are protected by explicit locks in system.c. They are
14915 * not properly protected in dmp.c (the increment here is not
14916 * atomic) but that hardly matters.
14917 * pending_ticks:
14918 * This is protected by explicit locks in clock.c. Don't
14919 * update realtime directly, since there are too many
14920 * references to it to guard conveniently.
14921 * lost_ticks:
14922 * Clock ticks counted outside the clock task.
14923 * sched_ticks, prev_ptr:
14924 * Updating these competes with similar code in do_clocktick().
14925 * No lock is necessary, because if bad things happen here
14926 * (like sched_ticks going negative), the code in do_clocktick()
14927 * will restore the variables to reasonable values, and an
14928 * occasional missed or extra sched() is harmless.
14929 *
14930 * Are these complications worth the trouble? Well, they make the system 15%
14931 * faster on a 5MHz 8088, and make task debugging much easier since there are
14932 * no task switches on an inactive system.
14933 */
14934
14935 register struct proc *rp;
14936 register unsigned ticks;
14937 clock_t now;
14938
14939 if (ps_mca) {
14940 /* Acknowledge the PS/2 clock interrupt. */
14941 out_byte(PORT_B, in_byte(PORT_B) | CLOCK_ACK_BIT);
14942 }
14943
14944 /* Update user and system accounting times.
14945 * First charge the current process for user time.
14946 * If the current process is not the billable process (usually because it
14947 * is a task), charge the billable process for system time as well.
14948 * Thus the unbillable tasks' user time is the billable users' system time.
14949 */
.Ep 186 src/kernel/clock.c
14950 if (k_reenter != 0)
14951 rp = proc_addr(HARDWARE);
14952 else
14953 rp = proc_ptr;
14954 ticks = lost_ticks + 1;
14955 lost_ticks = 0;
14956 rp->user_time += ticks;
14957 if (rp != bill_ptr && rp != proc_addr(IDLE)) bill_ptr->sys_time += ticks;
14958
14959 pending_ticks += ticks;
14960 now = realtime + pending_ticks;
14961 if (tty_timeout <= now) tty_wakeup(now); /* possibly wake up TTY */
14962 #if (CHIP != M68000)
14963 pr_restart(); /* possibly restart printer */
14964 #endif
14965 #if (CHIP == M68000)
14966 kb_timer(); /* keyboard repeat */
14967 if (sched_ticks == 1) fd_timer(); /* floppy deselect */
14968 #endif
14969
14970 if (next_alarm <= now ||
14971 sched_ticks == 1 &&
14972 bill_ptr == prev_ptr &&
14973 #if (SHADOWING == 0)
14974 rdy_head[USER_Q] != NIL_PROC) {
14975 #else
14976 (rdy_head[USER_Q] != NIL_PROC || rdy_head[SHADOW_Q] != NIL_PROC)) {
14977 #endif
14978 interrupt(CLOCK);
14979 return 1; /* Reenable interrupts */
14980 }
14981
14982 if (--sched_ticks == 0) {
14983 /* If bill_ptr == prev_ptr, no ready users so don't need sched(). */
14984 sched_ticks = SCHED_RATE; /* reset quantum */
14985 prev_ptr = bill_ptr; /* new previous process */
14986 }
14987 return 1; /* Reenable clock interrupt */
14988 }
14990 #if (CHIP == INTEL)
14991
14992 /*===========================================================================*
14993 * init_clock *
14994 *===========================================================================*/
14995 PRIVATE void init_clock()
14996 {
14997 /* Initialize channel 0 of the 8253A timer to e.g. 60 Hz. */
14998
14999 out_byte(TIMER_MODE, SQUARE_WAVE); /* set timer to run continuously */
15000 out_byte(TIMER0, TIMER_COUNT); /* load timer low byte */
15001 out_byte(TIMER0, TIMER_COUNT >> 8); /* load timer high byte */
15002 put_irq_handler(CLOCK_IRQ, clock_handler); /* set the interrupt handler */
15003 enable_irq(CLOCK_IRQ); /* ready for clock interrupts */
15004 }
15007 /*===========================================================================*
15008 * clock_stop *
15009 *===========================================================================*/
.Op 187 src/kernel/clock.c
15010 PUBLIC void clock_stop()
15011 {
15012 /* Reset the clock to the BIOS rate. (For rebooting) */
15013
15014 out_byte(TIMER_MODE, 0x36);
15015 out_byte(TIMER0, 0);
15016 out_byte(TIMER0, 0);
15017 }
15020 /*==========================================================================*
15021 * milli_delay *
15022 *==========================================================================*/
15023 PUBLIC void milli_delay(millisec)
15024 unsigned millisec;
15025 {
15026 /* Delay some milliseconds. */
15027
15028 struct milli_state ms;
15029
15030 milli_start(&ms);
15031 while (milli_elapsed(&ms) < millisec) {}
15032 }
15034 /*==========================================================================*
15035 * milli_start *
15036 *==========================================================================*/
15037 PUBLIC void milli_start(msp)
15038 struct milli_state *msp;
15039 {
15040 /* Prepare for calls to milli_elapsed(). */
15041
15042 msp->prev_count = 0;
15043 msp->accum_count = 0;
15044 }
15047 /*==========================================================================*
15048 * milli_elapsed *
15049 *==========================================================================*/
15050 PUBLIC unsigned milli_elapsed(msp)
15051 struct milli_state *msp;
15052 {
15053 /* Return the number of milliseconds since the call to milli_start(). Must be
15054 * polled rapidly.
15055 */
15056 unsigned count;
15057
15058 /* Read the counter for channel 0 of the 8253A timer. The counter
15059 * decrements at twice the timer frequency (one full cycle for each
15060 * half of square wave). The counter normally has a value between 0
15061 * and TIMER_COUNT, but before the clock task has been initialized,
15062 * its maximum value is 65535, as set by the BIOS.
15063 */
15064 out_byte(TIMER_MODE, LATCH_COUNT); /* make chip copy count to latch */
15065 count = in_byte(TIMER0); /* countdown continues during 2-step read */
15066 count |= in_byte(TIMER0) << 8;
15067
15068 /* Add difference between previous and new count unless the counter has
15069 * increased (restarted its cycle). We may lose a tick now and then, but
.Ep 188 src/kernel/clock.c
15070 * microsecond precision is not needed.
15071 */
15072 msp->accum_count += count <= msp->prev_count ? (msp->prev_count - count) : 1;
15073 msp->prev_count = count;
15074
15075 return msp->accum_count / (TIMER_FREQ / 1000);
15076 }
15077 #endif /* (CHIP == INTEL) */
15078
15079
15080 #if (CHIP == M68000)
15081 #include "staddr.h"
15082 #include "stmfp.h"
15083
15084 /*===========================================================================*
15085 * init_clock *
15086 *===========================================================================*/
15087 PRIVATE void init_clock()
15088 {
15089 /* Initialize the timer C in the MFP 68901.
15090 * Reducing to HZ is not possible by hardware. The resulting interrupt
15091 * rate is further reduced by software with a factor of 4.
15092 * Note that the expression below works for both HZ=50 and HZ=60.
15093 */
15094 do {
15095 MFP->mf_tcdr = TIMER_FREQ/(64*4*HZ);
15096 } while ((MFP->mf_tcdr & 0xFF) != TIMER_FREQ/(64*4*HZ));
15097 MFP->mf_tcdcr |= (T_Q064<<4);
15098 }
15099 #endif /* (CHIP == M68000) */
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/kernel/console.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
15100 /* Code and data for the IBM console driver.
15101 *
15102 * The 6845 video controller used by the IBM PC shares its video memory with
15103 * the CPU somewhere in the 0xB0000 memory bank. To the 6845 this memory
15104 * consists of 16-bit words. Each word has a character code in the low byte
15105 * and a so-called attribute byte in the high byte. The CPU directly modifies
15106 * video memory to display characters, and sets two registers on the 6845 that
15107 * specify the video origin and the cursor position. The video origin is the
15108 * place in video memory where the first character (upper left corner) can
15109 * be found. Moving the origin is a fast way to scroll the screen. Some
15110 * video adapters wrap around the top of video memory, so the origin can
15111 * move without bounds. For other adapters screen memory must sometimes be
15112 * moved to reset the origin. All computations on video memory use character
15113 * (word) addresses for simplicity and assume there is no wrapping. The
15114 * assembly support functions translate the word addresses to byte addresses
15115 * and the scrolling function worries about wrapping.
15116 */
15117
15118 #include "kernel.h"
15119 #include <termios.h>
.Op 189 src/kernel/console.c
15120 #include <minix/callnr.h>
15121 #include <minix/com.h>
15122 #include "protect.h"
15123 #include "tty.h"
15124 #include "proc.h"
15125
15126 /* Definitions used by the console driver. */
15127 #define MONO_BASE 0xB0000L /* base of mono video memory */
15128 #define COLOR_BASE 0xB8000L /* base of color video memory */
15129 #define MONO_SIZE 0x1000 /* 4K mono video memory */
15130 #define COLOR_SIZE 0x4000 /* 16K color video memory */
15131 #define EGA_SIZE 0x8000 /* EGA & VGA have at least 32K */
15132 #define BLANK_COLOR 0x0700 /* determines cursor color on blank screen */
15133 #define SCROLL_UP 0 /* scroll forward */
15134 #define SCROLL_DOWN 1 /* scroll backward */
15135 #define BLANK_MEM ((u16_t *) 0) /* tells mem_vid_copy() to blank the screen */
15136 #define CONS_RAM_WORDS 80 /* video ram buffer size */
15137 #define MAX_ESC_PARMS 2 /* number of escape sequence params allowed */
15138
15139 /* Constants relating to the controller chips. */
15140 #define M_6845 0x3B4 /* port for 6845 mono */
15141 #define C_6845 0x3D4 /* port for 6845 color */
15142 #define EGA 0x3C4 /* port for EGA card */
15143 #define INDEX 0 /* 6845's index register */
15144 #define DATA 1 /* 6845's data register */
15145 #define VID_ORG 12 /* 6845's origin register */
15146 #define CURSOR 14 /* 6845's cursor register */
15147
15148 /* Beeper. */
15149 #define BEEP_FREQ 0x0533 /* value to put into timer to set beep freq */
15150 #define B_TIME 3 /* length of CTRL-G beep is ticks */
15151
15152 /* definitions used for font management */
15153 #define GA_SEQUENCER_INDEX 0x3C4
15154 #define GA_SEQUENCER_DATA 0x3C5
15155 #define GA_GRAPHICS_INDEX 0x3CE
15156 #define GA_GRAPHICS_DATA 0x3CF
15157 #define GA_VIDEO_ADDRESS 0xA0000L
15158 #define GA_FONT_SIZE 8192
15159
15160 /* Global variables used by the console driver. */
15161 PUBLIC unsigned vid_seg; /* video ram selector (0xB0000 or 0xB8000) */
15162 PUBLIC unsigned vid_size; /* 0x2000 for color or 0x0800 for mono */
15163 PUBLIC unsigned vid_mask; /* 0x1FFF for color or 0x07FF for mono */
15164 PUBLIC unsigned blank_color = BLANK_COLOR; /* display code for blank */
15165
15166 /* Private variables used by the console driver. */
15167 PRIVATE int vid_port; /* I/O port for accessing 6845 */
15168 PRIVATE int wrap; /* hardware can wrap? */
15169 PRIVATE int softscroll; /* 1 = software scrolling, 0 = hardware */
15170 PRIVATE unsigned vid_base; /* base of video ram (0xB000 or 0xB800) */
15171 PRIVATE int beeping; /* speaker is beeping? */
15172 #define scr_width 80 /* # characters on a line */
15173 #define scr_lines 25 /* # lines on the screen */
15174 #define scr_size (80*25) /* # characters on the screen */
15175
15176 /* Per console data. */
15177 typedef struct console {
15178 tty_t *c_tty; /* associated TTY struct */
15179 int c_column; /* current column number (0-origin) */
.Ep 190 src/kernel/console.c
15180 int c_row; /* current row (0 at top of screen) */
15181 int c_rwords; /* number of WORDS (not bytes) in outqueue */
15182 unsigned c_start; /* start of video memory of this console */
15183 unsigned c_limit; /* limit of this console's video memory */
15184 unsigned c_org; /* location in RAM where 6845 base points */
15185 unsigned c_cur; /* current position of cursor in video RAM */
15186 unsigned c_attr; /* character attribute */
15187 unsigned c_blank; /* blank attribute */
15188 char c_esc_state; /* 0=normal, 1=ESC, 2=ESC[ */
15189 char c_esc_intro; /* Distinguishing character following ESC */
15190 int *c_esc_parmp; /* pointer to current escape parameter */
15191 int c_esc_parmv[MAX_ESC_PARMS]; /* list of escape parameters */
15192 u16_t c_ramqueue[CONS_RAM_WORDS]; /* buffer for video RAM */
15193 } console_t;
15194
15195 PRIVATE int nr_cons= 1; /* actual number of consoles */
15196 PRIVATE console_t cons_table[NR_CONS];
15197 PRIVATE console_t *curcons; /* currently visible */
15198
15199 /* Color if using a color controller. */
15200 #define color (vid_port == C_6845)
15201
15202 /* Map from ANSI colors to the attributes used by the PC */
15203 PRIVATE int ansi_colors[8] = {0, 4, 2, 6, 1, 5, 3, 7};
15204
15205 /* Structure used for font management */
15206 struct sequence {
15207 unsigned short index;
15208 unsigned char port;
15209 unsigned char value;
15210 };
15211
15212 FORWARD _PROTOTYPE( void cons_write, (struct tty *tp) );
15213 FORWARD _PROTOTYPE( void cons_echo, (tty_t *tp, int c) );
15214 FORWARD _PROTOTYPE( void out_char, (console_t *cons, int c) );
15215 FORWARD _PROTOTYPE( void beep, (void) );
15216 FORWARD _PROTOTYPE( void do_escape, (console_t *cons, int c) );
15217 FORWARD _PROTOTYPE( void flush, (console_t *cons) );
15218 FORWARD _PROTOTYPE( void parse_escape, (console_t *cons, int c) );
15219 FORWARD _PROTOTYPE( void scroll_screen, (console_t *cons, int dir) );
15220 FORWARD _PROTOTYPE( void set_6845, (int reg, unsigned val) );
15221 FORWARD _PROTOTYPE( void stop_beep, (void) );
15222 FORWARD _PROTOTYPE( void cons_org0, (void) );
15223 FORWARD _PROTOTYPE( void ga_program, (struct sequence *seq) );
15224
15225
15226 /*===========================================================================*
15227 * cons_write *
15228 *===========================================================================*/
15229 PRIVATE void cons_write(tp)
15230 register struct tty *tp; /* tells which terminal is to be used */
15231 {
15232 /* Copy as much data as possible to the output queue, then start I/O. On
15233 * memory-mapped terminals, such as the IBM console, the I/O will also be
15234 * finished, and the counts updated. Keep repeating until all I/O done.
15235 */
15236
15237 int count;
15238 register char *tbuf;
15239 char buf[64];
.Op 191 src/kernel/console.c
15240 phys_bytes user_phys;
15241 console_t *cons = tp->tty_priv;
15242
15243 /* Check quickly for nothing to do, so this can be called often without
15244 * unmodular tests elsewhere.
15245 */
15246 if ((count = tp->tty_outleft) == 0 || tp->tty_inhibited) return;
15247
15248 /* Copy the user bytes to buf[] for decent addressing. Loop over the
15249 * copies, since the user buffer may be much larger than buf[].
15250 */
15251 do {
15252 if (count > sizeof(buf)) count = sizeof(buf);
15253 user_phys = proc_vir2phys(proc_addr(tp->tty_outproc), tp->tty_out_vir);
15254 phys_copy(user_phys, vir2phys(buf), (phys_bytes) count);
15255 tbuf = buf;
15256
15257 /* Update terminal data structure. */
15258 tp->tty_out_vir += count;
15259 tp->tty_outcum += count;
15260 tp->tty_outleft -= count;
15261
15262 /* Output each byte of the copy to the screen. Avoid calling
15263 * out_char() for the "easy" characters, put them into the buffer
15264 * directly.
15265 */
15266 do {
15267 if ((unsigned) *tbuf < ' ' || cons->c_esc_state > 0
15268 || cons->c_column >= scr_width
15269 || cons->c_rwords >= buflen(cons->c_ramqueue))
15270 {
15271 out_char(cons, *tbuf++);
15272 } else {
15273 cons->c_ramqueue[cons->c_rwords++] =
15274 cons->c_attr | (*tbuf++ & BYTE);
15275 cons->c_column++;
15276 }
15277 } while (--count != 0);
15278 } while ((count = tp->tty_outleft) != 0 && !tp->tty_inhibited);
15279
15280 flush(cons); /* transfer anything buffered to the screen */
15281
15282 /* Reply to the writer if all output is finished. */
15283 if (tp->tty_outleft == 0) {
15284 tty_reply(tp->tty_outrepcode, tp->tty_outcaller, tp->tty_outproc,
15285 tp->tty_outcum);
15286 tp->tty_outcum = 0;
15287 }
15288 }
15291 /*===========================================================================*
15292 * cons_echo *
15293 *===========================================================================*/
15294 PRIVATE void cons_echo(tp, c)
15295 register tty_t *tp; /* pointer to tty struct */
15296 int c; /* character to be echoed */
15297 {
15298 /* Echo keyboard input (print & flush). */
15299 console_t *cons = tp->tty_priv;
.Ep 192 src/kernel/console.c
15300
15301 out_char(cons, c);
15302 flush(cons);
15303 }
15306 /*===========================================================================*
15307 * out_char *
15308 *===========================================================================*/
15309 PRIVATE void out_char(cons, c)
15310 register console_t *cons; /* pointer to console struct */
15311 int c; /* character to be output */
15312 {
15313 /* Output a character on the console. Check for escape sequences first. */
15314 if (cons->c_esc_state > 0) {
15315 parse_escape(cons, c);
15316 return;
15317 }
15318
15319 switch(c) {
15320 case 000: /* null is typically used for padding */
15321 return; /* better not do anything */
15322
15323 case 007: /* ring the bell */
15324 flush(cons); /* print any chars queued for output */
15325 beep();
15326 return;
15327
15328 case 'b': /* backspace */
15329 if (--cons->c_column < 0) {
15330 if (--cons->c_row >= 0) cons->c_column += scr_width;
15331 }
15332 flush(cons);
15333 return;
15334
15335 case 'n': /* line feed */
15336 if ((cons->c_tty->tty_termios.c_oflag & (OPOST|ONLCR))
15337 == (OPOST|ONLCR)) {
15338 cons->c_column = 0;
15339 }
15340 /*FALL THROUGH*/
15341 case 013: /* CTRL-K */
15342 case 014: /* CTRL-L */
15343 if (cons->c_row == scr_lines-1) {
15344 scroll_screen(cons, SCROLL_UP);
15345 } else {
15346 cons->c_row++;
15347 }
15348 flush(cons);
15349 return;
15350
15351 case 'r': /* carriage return */
15352 cons->c_column = 0;
15353 flush(cons);
15354 return;
15355
15356 case 't': /* tab */
15357 cons->c_column = (cons->c_column + TAB_SIZE) & ~TAB_MASK;
15358 if (cons->c_column > scr_width) {
15359 cons->c_column -= scr_width;
.Op 193 src/kernel/console.c
15360 if (cons->c_row == scr_lines-1) {
15361 scroll_screen(cons, SCROLL_UP);
15362 } else {
15363 cons->c_row++;
15364 }
15365 }
15366 flush(cons);
15367 return;
15368
15369 case 033: /* ESC - start of an escape sequence */
15370 flush(cons); /* print any chars queued for output */
15371 cons->c_esc_state = 1; /* mark ESC as seen */
15372 return;
15373
15374 default: /* printable chars are stored in ramqueue */
15375 if (cons->c_column >= scr_width) {
15376 if (!LINEWRAP) return;
15377 if (cons->c_row == scr_lines-1) {
15378 scroll_screen(cons, SCROLL_UP);
15379 } else {
15380 cons->c_row++;
15381 }
15382 cons->c_column = 0;
15383 flush(cons);
15384 }
15385 if (cons->c_rwords == buflen(cons->c_ramqueue)) flush(cons);
15386 cons->c_ramqueue[cons->c_rwords++] = cons->c_attr | (c & BYTE);
15387 cons->c_column++; /* next column */
15388 return;
15389 }
15390 }
15393 /*===========================================================================*
15394 * scroll_screen *
15395 *===========================================================================*/
15396 PRIVATE void scroll_screen(cons, dir)
15397 register console_t *cons; /* pointer to console struct */
15398 int dir; /* SCROLL_UP or SCROLL_DOWN */
15399 {
15400 unsigned new_line, new_org, chars;
15401
15402 flush(cons);
15403 chars = scr_size - scr_width; /* one screen minus one line */
15404
15405 /* Scrolling the screen is a real nuisance due to the various incompatible
15406 * video cards. This driver supports software scrolling (Hercules?),
15407 * hardware scrolling (mono and CGA cards) and hardware scrolling without
15408 * wrapping (EGA cards). In the latter case we must make sure that
15409 * c_start <= c_org && c_org + scr_size <= c_limit
15410 * holds, because EGA doesn't wrap around the end of video memory.
15411 */
15412 if (dir == SCROLL_UP) {
15413 /* Scroll one line up in 3 ways: soft, avoid wrap, use origin. */
15414 if (softscroll) {
15415 vid_vid_copy(cons->c_start + scr_width, cons->c_start, chars);
15416 } else
15417 if (!wrap && cons->c_org + scr_size + scr_width >= cons->c_limit) {
15418 vid_vid_copy(cons->c_org + scr_width, cons->c_start, chars);
15419 cons->c_org = cons->c_start;
.Ep 194 src/kernel/console.c
15420 } else {
15421 cons->c_org = (cons->c_org + scr_width) & vid_mask;
15422 }
15423 new_line = (cons->c_org + chars) & vid_mask;
15424 } else {
15425 /* Scroll one line down in 3 ways: soft, avoid wrap, use origin. */
15426 if (softscroll) {
15427 vid_vid_copy(cons->c_start, cons->c_start + scr_width, chars);
15428 } else
15429 if (!wrap && cons->c_org < cons->c_start + scr_width) {
15430 new_org = cons->c_limit - scr_size;
15431 vid_vid_copy(cons->c_org, new_org + scr_width, chars);
15432 cons->c_org = new_org;
15433 } else {
15434 cons->c_org = (cons->c_org - scr_width) & vid_mask;
15435 }
15436 new_line = cons->c_org;
15437 }
15438 /* Blank the new line at top or bottom. */
15439 blank_color = cons->c_blank;
15440 mem_vid_copy(BLANK_MEM, new_line, scr_width);
15441
15442 /* Set the new video origin. */
15443 if (cons == curcons) set_6845(VID_ORG, cons->c_org);
15444 flush(cons);
15445 }
15448 /*===========================================================================*
15449 * flush *
15450 *===========================================================================*/
15451 PRIVATE void flush(cons)
15452 register console_t *cons; /* pointer to console struct */
15453 {
15454 /* Send characters buffered in 'ramqueue' to screen memory, check the new
15455 * cursor position, compute the new hardware cursor position and set it.
15456 */
15457 unsigned cur;
15458 tty_t *tp = cons->c_tty;
15459
15460 /* Have the characters in 'ramqueue' transferred to the screen. */
15461 if (cons->c_rwords > 0) {
15462 mem_vid_copy(cons->c_ramqueue, cons->c_cur, cons->c_rwords);
15463 cons->c_rwords = 0;
15464
15465 /* TTY likes to know the current column and if echoing messed up. */
15466 tp->tty_position = cons->c_column;
15467 tp->tty_reprint = TRUE;
15468 }
15469
15470 /* Check and update the cursor position. */
15471 if (cons->c_column < 0) cons->c_column = 0;
15472 if (cons->c_column > scr_width) cons->c_column = scr_width;
15473 if (cons->c_row < 0) cons->c_row = 0;
15474 if (cons->c_row >= scr_lines) cons->c_row = scr_lines - 1;
15475 cur = cons->c_org + cons->c_row * scr_width + cons->c_column;
15476 if (cur != cons->c_cur) {
15477 if (cons == curcons) set_6845(CURSOR, cur);
15478 cons->c_cur = cur;
15479 }
.Op 195 src/kernel/console.c
15480 }
15483 /*===========================================================================*
15484 * parse_escape *
15485 *===========================================================================*/
15486 PRIVATE void parse_escape(cons, c)
15487 register console_t *cons; /* pointer to console struct */
15488 char c; /* next character in escape sequence */
15489 {
15490 /* The following ANSI escape sequences are currently supported.
15491 * If n and/or m are omitted, they default to 1.
15492 * ESC [nA moves up n lines
15493 * ESC [nB moves down n lines
15494 * ESC [nC moves right n spaces
15495 * ESC [nD moves left n spaces
15496 * ESC [m;nH" moves cursor to (m,n)
15497 * ESC [J clears screen from cursor
15498 * ESC [K clears line from cursor
15499 * ESC [nL inserts n lines ar cursor
15500 * ESC [nM deletes n lines at cursor
15501 * ESC [nP deletes n chars at cursor
15502 * ESC [n@ inserts n chars at cursor
15503 * ESC [nm enables rendition n (0=normal, 4=bold, 5=blinking, 7=reverse)
15504 * ESC M scrolls the screen backwards if the cursor is on the top line
15505 */
15506
15507 switch (cons->c_esc_state) {
15508 case 1: /* ESC seen */
15509 cons->c_esc_intro = '';
15510 cons->c_esc_parmp = cons->c_esc_parmv;
15511 cons->c_esc_parmv[0] = cons->c_esc_parmv[1] = 0;
15512 switch (c) {
15513 case '[': /* Control Sequence Introducer */
15514 cons->c_esc_intro = c;
15515 cons->c_esc_state = 2;
15516 break;
15517 case 'M': /* Reverse Index */
15518 do_escape(cons, c);
15519 break;
15520 default:
15521 cons->c_esc_state = 0;
15522 }
15523 break;
15524
15525 case 2: /* ESC [ seen */
15526 if (c >= '0' && c <= '9') {
15527 if (cons->c_esc_parmp < bufend(cons->c_esc_parmv))
15528 *cons->c_esc_parmp = *cons->c_esc_parmp * 10 + (c-'0');
15529 } else
15530 if (c == ';') {
15531 if (++cons->c_esc_parmp < bufend(cons->c_esc_parmv))
15532 *cons->c_esc_parmp = 0;
15533 } else {
15534 do_escape(cons, c);
15535 }
15536 break;
15537 }
15538 }
.Ep 196 src/kernel/console.c
15541 /*===========================================================================*
15542 * do_escape *
15543 *===========================================================================*/
15544 PRIVATE void do_escape(cons, c)
15545 register console_t *cons; /* pointer to console struct */
15546 char c; /* next character in escape sequence */
15547 {
15548 int value, n;
15549 unsigned src, dst, count;
15550
15551 /* Some of these things hack on screen RAM, so it had better be up to date */
15552 flush(cons);
15553
15554 if (cons->c_esc_intro == '') {
15555 /* Handle a sequence beginning with just ESC */
15556 switch (c) {
15557 case 'M': /* Reverse Index */
15558 if (cons->c_row == 0) {
15559 scroll_screen(cons, SCROLL_DOWN);
15560 } else {
15561 cons->c_row--;
15562 }
15563 flush(cons);
15564 break;
15565
15566 default: break;
15567 }
15568 } else
15569 if (cons->c_esc_intro == '[') {
15570 /* Handle a sequence beginning with ESC [ and parameters */
15571 value = cons->c_esc_parmv[0];
15572 switch (c) {
15573 case 'A': /* ESC [nA moves up n lines */
15574 n = (value == 0 ? 1 : value);
15575 cons->c_row -= n;
15576 flush(cons);
15577 break;
15578
15579 case 'B': /* ESC [nB moves down n lines */
15580 n = (value == 0 ? 1 : value);
15581 cons->c_row += n;
15582 flush(cons);
15583 break;
15584
15585 case 'C': /* ESC [nC moves right n spaces */
15586 n = (value == 0 ? 1 : value);
15587 cons->c_column += n;
15588 flush(cons);
15589 break;
15590
15591 case 'D': /* ESC [nD moves left n spaces */
15592 n = (value == 0 ? 1 : value);
15593 cons->c_column -= n;
15594 flush(cons);
15595 break;
15596
15597 case 'H': /* ESC [m;nH" moves cursor to (m,n) */
15598 cons->c_row = cons->c_esc_parmv[0] - 1;
15599 cons->c_column = cons->c_esc_parmv[1] - 1;
.Op 197 src/kernel/console.c
15600 flush(cons);
15601 break;
15602
15603 case 'J': /* ESC [sJ clears in display */
15604 switch (value) {
15605 case 0: /* Clear from cursor to end of screen */
15606 count = scr_size - (cons->c_cur - cons->c_org);
15607 dst = cons->c_cur;
15608 break;
15609 case 1: /* Clear from start of screen to cursor */
15610 count = cons->c_cur - cons->c_org;
15611 dst = cons->c_org;
15612 break;
15613 case 2: /* Clear entire screen */
15614 count = scr_size;
15615 dst = cons->c_org;
15616 break;
15617 default: /* Do nothing */
15618 count = 0;
15619 dst = cons->c_org;
15620 }
15621 blank_color = cons->c_blank;
15622 mem_vid_copy(BLANK_MEM, dst, count);
15623 break;
15624
15625 case 'K': /* ESC [sK clears line from cursor */
15626 switch (value) {