vt.c
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上传日期:2013-04-10
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文件大小:31k
- /*
- * linux/drivers/char/vt.c
- *
- * Copyright (C) 1992 obz under the linux copyright
- *
- * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
- * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
- * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
- * Some code moved for less code duplication - Andi Kleen - Mar 1997
- * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/errno.h>
- #include <linux/sched.h>
- #include <linux/tty.h>
- #include <linux/timer.h>
- #include <linux/kernel.h>
- #include <linux/kd.h>
- #include <linux/vt.h>
- #include <linux/string.h>
- #include <linux/slab.h>
- #include <linux/major.h>
- #include <linux/fs.h>
- #include <linux/console.h>
- #include <asm/io.h>
- #include <asm/uaccess.h>
- #include <linux/kbd_kern.h>
- #include <linux/vt_kern.h>
- #include <linux/kbd_diacr.h>
- #include <linux/selection.h>
- #ifdef CONFIG_FB_COMPAT_XPMAC
- #include <asm/vc_ioctl.h>
- #endif /* CONFIG_FB_COMPAT_XPMAC */
- char vt_dont_switch;
- extern struct tty_driver console_driver;
- #define VT_IS_IN_USE(i) (console_driver.table[i] && console_driver.table[i]->count)
- #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || i == sel_cons)
- /*
- * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
- * experimentation and study of X386 SYSV handling.
- *
- * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
- * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
- * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
- * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
- * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
- * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
- * to the current console is done by the main ioctl code.
- */
- struct vt_struct *vt_cons[MAX_NR_CONSOLES];
- /* Keyboard type: Default is KB_101, but can be set by machine
- * specific code.
- */
- unsigned char keyboard_type = KB_101;
- #if !defined(__alpha__) && !defined(__ia64__) && !defined(__mips__) && !defined(__arm__) && !defined(__sh__)
- asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int on);
- #endif
- unsigned int video_font_height;
- unsigned int default_font_height;
- unsigned int video_scan_lines;
- /*
- * these are the valid i/o ports we're allowed to change. they map all the
- * video ports
- */
- #define GPFIRST 0x3b4
- #define GPLAST 0x3df
- #define GPNUM (GPLAST - GPFIRST + 1)
- /*
- * Generates sound of some frequency for some number of clock ticks
- *
- * If freq is 0, will turn off sound, else will turn it on for that time.
- * If msec is 0, will return immediately, else will sleep for msec time, then
- * turn sound off.
- *
- * We also return immediately, which is what was implied within the X
- * comments - KDMKTONE doesn't put the process to sleep.
- */
- #if defined(__i386__) || defined(__alpha__) || defined(CONFIG_PPC_ISATIMER)
- || (defined(__mips__) && defined(CONFIG_ISA))
- || (defined(__arm__) && defined(CONFIG_HOST_FOOTBRIDGE))
- || defined(__x86_64__)
- static void
- kd_nosound(unsigned long ignored)
- {
- /* disable counter 2 */
- outb(inb_p(0x61)&0xFC, 0x61);
- return;
- }
- void
- _kd_mksound(unsigned int hz, unsigned int ticks)
- {
- static struct timer_list sound_timer = { function: kd_nosound };
- unsigned int count = 0;
- unsigned long flags;
- if (hz > 20 && hz < 32767)
- count = 1193180 / hz;
-
- save_flags(flags);
- cli();
- del_timer(&sound_timer);
- if (count) {
- /* enable counter 2 */
- outb_p(inb_p(0x61)|3, 0x61);
- /* set command for counter 2, 2 byte write */
- outb_p(0xB6, 0x43);
- /* select desired HZ */
- outb_p(count & 0xff, 0x42);
- outb((count >> 8) & 0xff, 0x42);
- if (ticks) {
- sound_timer.expires = jiffies+ticks;
- add_timer(&sound_timer);
- }
- } else
- kd_nosound(0);
- restore_flags(flags);
- return;
- }
- #else
- void
- _kd_mksound(unsigned int hz, unsigned int ticks)
- {
- }
- #endif
- int _kbd_rate(struct kbd_repeat *rep)
- {
- return -EINVAL;
- }
- void (*kd_mksound)(unsigned int hz, unsigned int ticks) = _kd_mksound;
- int (*kbd_rate)(struct kbd_repeat *rep) = _kbd_rate;
- #define i (tmp.kb_index)
- #define s (tmp.kb_table)
- #define v (tmp.kb_value)
- static inline int
- do_kdsk_ioctl(int cmd, struct kbentry *user_kbe, int perm, struct kbd_struct *kbd)
- {
- struct kbentry tmp;
- ushort *key_map, val, ov;
- if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
- return -EFAULT;
- if (i >= NR_KEYS || s >= MAX_NR_KEYMAPS)
- return -EINVAL;
- switch (cmd) {
- case KDGKBENT:
- key_map = key_maps[s];
- if (key_map) {
- val = U(key_map[i]);
- if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
- val = K_HOLE;
- } else
- val = (i ? K_HOLE : K_NOSUCHMAP);
- return put_user(val, &user_kbe->kb_value);
- case KDSKBENT:
- if (!perm)
- return -EPERM;
- if (!i && v == K_NOSUCHMAP) {
- /* disallocate map */
- key_map = key_maps[s];
- if (s && key_map) {
- key_maps[s] = 0;
- if (key_map[0] == U(K_ALLOCATED)) {
- kfree(key_map);
- keymap_count--;
- }
- }
- break;
- }
- if (KTYP(v) < NR_TYPES) {
- if (KVAL(v) > max_vals[KTYP(v)])
- return -EINVAL;
- } else
- if (kbd->kbdmode != VC_UNICODE)
- return -EINVAL;
- /* ++Geert: non-PC keyboards may generate keycode zero */
- #if !defined(__mc68000__) && !defined(__powerpc__)
- /* assignment to entry 0 only tests validity of args */
- if (!i)
- break;
- #endif
- if (!(key_map = key_maps[s])) {
- int j;
- if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
- !capable(CAP_SYS_RESOURCE))
- return -EPERM;
- key_map = (ushort *) kmalloc(sizeof(plain_map),
- GFP_KERNEL);
- if (!key_map)
- return -ENOMEM;
- key_maps[s] = key_map;
- key_map[0] = U(K_ALLOCATED);
- for (j = 1; j < NR_KEYS; j++)
- key_map[j] = U(K_HOLE);
- keymap_count++;
- }
- ov = U(key_map[i]);
- if (v == ov)
- break; /* nothing to do */
- /*
- * Attention Key.
- */
- if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN))
- return -EPERM;
- key_map[i] = U(v);
- if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT))
- compute_shiftstate();
- break;
- }
- return 0;
- }
- #undef i
- #undef s
- #undef v
- static inline int
- do_kbkeycode_ioctl(int cmd, struct kbkeycode *user_kbkc, int perm)
- {
- struct kbkeycode tmp;
- int kc = 0;
- if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
- return -EFAULT;
- switch (cmd) {
- case KDGETKEYCODE:
- kc = getkeycode(tmp.scancode);
- if (kc >= 0)
- kc = put_user(kc, &user_kbkc->keycode);
- break;
- case KDSETKEYCODE:
- if (!perm)
- return -EPERM;
- kc = setkeycode(tmp.scancode, tmp.keycode);
- break;
- }
- return kc;
- }
- static inline int
- do_kdgkb_ioctl(int cmd, struct kbsentry *user_kdgkb, int perm)
- {
- struct kbsentry tmp;
- char *p;
- u_char *q;
- int sz;
- int delta;
- char *first_free, *fj, *fnw;
- int i, j, k;
- /* we mostly copy too much here (512bytes), but who cares ;) */
- if (copy_from_user(&tmp, user_kdgkb, sizeof(struct kbsentry)))
- return -EFAULT;
- tmp.kb_string[sizeof(tmp.kb_string)-1] = ' ';
- if (tmp.kb_func >= MAX_NR_FUNC)
- return -EINVAL;
- i = tmp.kb_func;
- switch (cmd) {
- case KDGKBSENT:
- sz = sizeof(tmp.kb_string) - 1; /* sz should have been
- a struct member */
- q = user_kdgkb->kb_string;
- p = func_table[i];
- if(p)
- for ( ; *p && sz; p++, sz--)
- if (put_user(*p, q++))
- return -EFAULT;
- if (put_user(' ', q))
- return -EFAULT;
- return ((p && *p) ? -EOVERFLOW : 0);
- case KDSKBSENT:
- if (!perm)
- return -EPERM;
- q = func_table[i];
- first_free = funcbufptr + (funcbufsize - funcbufleft);
- for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++)
- ;
- if (j < MAX_NR_FUNC)
- fj = func_table[j];
- else
- fj = first_free;
- delta = (q ? -strlen(q) : 1) + strlen(tmp.kb_string);
- if (delta <= funcbufleft) { /* it fits in current buf */
- if (j < MAX_NR_FUNC) {
- memmove(fj + delta, fj, first_free - fj);
- for (k = j; k < MAX_NR_FUNC; k++)
- if (func_table[k])
- func_table[k] += delta;
- }
- if (!q)
- func_table[i] = fj;
- funcbufleft -= delta;
- } else { /* allocate a larger buffer */
- sz = 256;
- while (sz < funcbufsize - funcbufleft + delta)
- sz <<= 1;
- fnw = (char *) kmalloc(sz, GFP_KERNEL);
- if(!fnw)
- return -ENOMEM;
- if (!q)
- func_table[i] = fj;
- if (fj > funcbufptr)
- memmove(fnw, funcbufptr, fj - funcbufptr);
- for (k = 0; k < j; k++)
- if (func_table[k])
- func_table[k] = fnw + (func_table[k] - funcbufptr);
- if (first_free > fj) {
- memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
- for (k = j; k < MAX_NR_FUNC; k++)
- if (func_table[k])
- func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
- }
- if (funcbufptr != func_buf)
- kfree(funcbufptr);
- funcbufptr = fnw;
- funcbufleft = funcbufleft - delta + sz - funcbufsize;
- funcbufsize = sz;
- }
- strcpy(func_table[i], tmp.kb_string);
- break;
- }
- return 0;
- }
- static inline int
- do_fontx_ioctl(int cmd, struct consolefontdesc *user_cfd, int perm)
- {
- struct consolefontdesc cfdarg;
- struct console_font_op op;
- int i;
- if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
- return -EFAULT;
-
- switch (cmd) {
- case PIO_FONTX:
- if (!perm)
- return -EPERM;
- op.op = KD_FONT_OP_SET;
- op.flags = KD_FONT_FLAG_OLD;
- op.width = 8;
- op.height = cfdarg.charheight;
- op.charcount = cfdarg.charcount;
- op.data = cfdarg.chardata;
- return con_font_op(fg_console, &op);
- case GIO_FONTX: {
- op.op = KD_FONT_OP_GET;
- op.flags = KD_FONT_FLAG_OLD;
- op.width = 8;
- op.height = cfdarg.charheight;
- op.charcount = cfdarg.charcount;
- op.data = cfdarg.chardata;
- i = con_font_op(fg_console, &op);
- if (i)
- return i;
- cfdarg.charheight = op.height;
- cfdarg.charcount = op.charcount;
- if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
- return -EFAULT;
- return 0;
- }
- }
- return -EINVAL;
- }
- static inline int
- do_unimap_ioctl(int cmd, struct unimapdesc *user_ud,int perm)
- {
- struct unimapdesc tmp;
- int i = 0;
- if (copy_from_user(&tmp, user_ud, sizeof tmp))
- return -EFAULT;
- if (tmp.entries) {
- i = verify_area(VERIFY_WRITE, tmp.entries,
- tmp.entry_ct*sizeof(struct unipair));
- if (i) return i;
- }
- switch (cmd) {
- case PIO_UNIMAP:
- if (!perm)
- return -EPERM;
- return con_set_unimap(fg_console, tmp.entry_ct, tmp.entries);
- case GIO_UNIMAP:
- return con_get_unimap(fg_console, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
- }
- return 0;
- }
- /*
- * We handle the console-specific ioctl's here. We allow the
- * capability to modify any console, not just the fg_console.
- */
- int vt_ioctl(struct tty_struct *tty, struct file * file,
- unsigned int cmd, unsigned long arg)
- {
- int i, perm;
- unsigned int console;
- unsigned char ucval;
- struct kbd_struct * kbd;
- struct vt_struct *vt = (struct vt_struct *)tty->driver_data;
- console = vt->vc_num;
- if (!vc_cons_allocated(console)) /* impossible? */
- return -ENOIOCTLCMD;
- /*
- * To have permissions to do most of the vt ioctls, we either have
- * to be the owner of the tty, or super-user.
- */
- perm = 0;
- if (current->tty == tty || suser())
- perm = 1;
-
- kbd = kbd_table + console;
- switch (cmd) {
- case KIOCSOUND:
- if (!perm)
- return -EPERM;
- if (arg)
- arg = 1193180 / arg;
- kd_mksound(arg, 0);
- return 0;
- case KDMKTONE:
- if (!perm)
- return -EPERM;
- {
- unsigned int ticks, count;
-
- /*
- * Generate the tone for the appropriate number of ticks.
- * If the time is zero, turn off sound ourselves.
- */
- ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
- count = ticks ? (arg & 0xffff) : 0;
- if (count)
- count = 1193180 / count;
- kd_mksound(count, ticks);
- return 0;
- }
- case KDGKBTYPE:
- /*
- * this is naive.
- */
- ucval = keyboard_type;
- goto setchar;
- #if defined(CONFIG_X86)
- /*
- * These cannot be implemented on any machine that implements
- * ioperm() in user level (such as Alpha PCs).
- */
- case KDADDIO:
- case KDDELIO:
- /*
- * KDADDIO and KDDELIO may be able to add ports beyond what
- * we reject here, but to be safe...
- */
- if (arg < GPFIRST || arg > GPLAST)
- return -EINVAL;
- return sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
- case KDENABIO:
- case KDDISABIO:
- return sys_ioperm(GPFIRST, GPNUM,
- (cmd == KDENABIO)) ? -ENXIO : 0;
- #endif
- /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
-
- case KDKBDREP:
- {
- struct kbd_repeat kbrep;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- if (copy_from_user(&kbrep, (void *)arg,
- sizeof(struct kbd_repeat)))
- return -EFAULT;
- if ((i = kbd_rate( &kbrep )))
- return i;
- if (copy_to_user((void *)arg, &kbrep,
- sizeof(struct kbd_repeat)))
- return -EFAULT;
- return 0;
- }
- case KDSETMODE:
- /*
- * currently, setting the mode from KD_TEXT to KD_GRAPHICS
- * doesn't do a whole lot. i'm not sure if it should do any
- * restoration of modes or what...
- */
- if (!perm)
- return -EPERM;
- switch (arg) {
- case KD_GRAPHICS:
- break;
- case KD_TEXT0:
- case KD_TEXT1:
- arg = KD_TEXT;
- case KD_TEXT:
- break;
- default:
- return -EINVAL;
- }
- if (vt_cons[console]->vc_mode == (unsigned char) arg)
- return 0;
- vt_cons[console]->vc_mode = (unsigned char) arg;
- if (console != fg_console)
- return 0;
- /*
- * explicitly blank/unblank the screen if switching modes
- */
- if (arg == KD_TEXT)
- unblank_screen();
- else
- do_blank_screen(1);
- return 0;
- case KDGETMODE:
- ucval = vt_cons[console]->vc_mode;
- goto setint;
- case KDMAPDISP:
- case KDUNMAPDISP:
- /*
- * these work like a combination of mmap and KDENABIO.
- * this could be easily finished.
- */
- return -EINVAL;
- case KDSKBMODE:
- if (!perm)
- return -EPERM;
- switch(arg) {
- case K_RAW:
- kbd->kbdmode = VC_RAW;
- break;
- case K_MEDIUMRAW:
- kbd->kbdmode = VC_MEDIUMRAW;
- break;
- case K_XLATE:
- kbd->kbdmode = VC_XLATE;
- compute_shiftstate();
- break;
- case K_UNICODE:
- kbd->kbdmode = VC_UNICODE;
- compute_shiftstate();
- break;
- default:
- return -EINVAL;
- }
- if (tty->ldisc.flush_buffer)
- tty->ldisc.flush_buffer(tty);
- return 0;
- case KDGKBMODE:
- ucval = ((kbd->kbdmode == VC_RAW) ? K_RAW :
- (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW :
- (kbd->kbdmode == VC_UNICODE) ? K_UNICODE :
- K_XLATE);
- goto setint;
- /* this could be folded into KDSKBMODE, but for compatibility
- reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
- case KDSKBMETA:
- switch(arg) {
- case K_METABIT:
- clr_vc_kbd_mode(kbd, VC_META);
- break;
- case K_ESCPREFIX:
- set_vc_kbd_mode(kbd, VC_META);
- break;
- default:
- return -EINVAL;
- }
- return 0;
- case KDGKBMETA:
- ucval = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
- setint:
- return put_user(ucval, (int *)arg);
- case KDGETKEYCODE:
- case KDSETKEYCODE:
- if(!capable(CAP_SYS_ADMIN))
- perm=0;
- return do_kbkeycode_ioctl(cmd, (struct kbkeycode *)arg, perm);
- case KDGKBENT:
- case KDSKBENT:
- return do_kdsk_ioctl(cmd, (struct kbentry *)arg, perm, kbd);
- case KDGKBSENT:
- case KDSKBSENT:
- return do_kdgkb_ioctl(cmd, (struct kbsentry *)arg, perm);
- case KDGKBDIACR:
- {
- struct kbdiacrs *a = (struct kbdiacrs *)arg;
- if (put_user(accent_table_size, &a->kb_cnt))
- return -EFAULT;
- if (copy_to_user(a->kbdiacr, accent_table, accent_table_size*sizeof(struct kbdiacr)))
- return -EFAULT;
- return 0;
- }
- case KDSKBDIACR:
- {
- struct kbdiacrs *a = (struct kbdiacrs *)arg;
- unsigned int ct;
- if (!perm)
- return -EPERM;
- if (get_user(ct,&a->kb_cnt))
- return -EFAULT;
- if (ct >= MAX_DIACR)
- return -EINVAL;
- accent_table_size = ct;
- if (copy_from_user(accent_table, a->kbdiacr, ct*sizeof(struct kbdiacr)))
- return -EFAULT;
- return 0;
- }
- /* the ioctls below read/set the flags usually shown in the leds */
- /* don't use them - they will go away without warning */
- case KDGKBLED:
- ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
- goto setchar;
- case KDSKBLED:
- if (!perm)
- return -EPERM;
- if (arg & ~0x77)
- return -EINVAL;
- kbd->ledflagstate = (arg & 7);
- kbd->default_ledflagstate = ((arg >> 4) & 7);
- set_leds();
- return 0;
- /* the ioctls below only set the lights, not the functions */
- /* for those, see KDGKBLED and KDSKBLED above */
- case KDGETLED:
- ucval = getledstate();
- setchar:
- return put_user(ucval, (char*)arg);
- case KDSETLED:
- if (!perm)
- return -EPERM;
- setledstate(kbd, arg);
- return 0;
- /*
- * A process can indicate its willingness to accept signals
- * generated by pressing an appropriate key combination.
- * Thus, one can have a daemon that e.g. spawns a new console
- * upon a keypress and then changes to it.
- * Probably init should be changed to do this (and have a
- * field ks (`keyboard signal') in inittab describing the
- * desired action), so that the number of background daemons
- * does not increase.
- */
- case KDSIGACCEPT:
- {
- extern int spawnpid, spawnsig;
- if (!perm || !capable(CAP_KILL))
- return -EPERM;
- if (arg < 1 || arg > _NSIG || arg == SIGKILL)
- return -EINVAL;
- spawnpid = current->pid;
- spawnsig = arg;
- return 0;
- }
- case VT_SETMODE:
- {
- struct vt_mode tmp;
- if (!perm)
- return -EPERM;
- if (copy_from_user(&tmp, (void*)arg, sizeof(struct vt_mode)))
- return -EFAULT;
- if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS)
- return -EINVAL;
- vt_cons[console]->vt_mode = tmp;
- /* the frsig is ignored, so we set it to 0 */
- vt_cons[console]->vt_mode.frsig = 0;
- vt_cons[console]->vt_pid = current->pid;
- /* no switch is required -- saw@shade.msu.ru */
- vt_cons[console]->vt_newvt = -1;
- return 0;
- }
- case VT_GETMODE:
- return copy_to_user((void*)arg, &(vt_cons[console]->vt_mode),
- sizeof(struct vt_mode)) ? -EFAULT : 0;
- /*
- * Returns global vt state. Note that VT 0 is always open, since
- * it's an alias for the current VT, and people can't use it here.
- * We cannot return state for more than 16 VTs, since v_state is short.
- */
- case VT_GETSTATE:
- {
- struct vt_stat *vtstat = (struct vt_stat *)arg;
- unsigned short state, mask;
- if (put_user(fg_console + 1, &vtstat->v_active))
- return -EFAULT;
- state = 1; /* /dev/tty0 is always open */
- for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; ++i, mask <<= 1)
- if (VT_IS_IN_USE(i))
- state |= mask;
- return put_user(state, &vtstat->v_state);
- }
- /*
- * Returns the first available (non-opened) console.
- */
- case VT_OPENQRY:
- for (i = 0; i < MAX_NR_CONSOLES; ++i)
- if (! VT_IS_IN_USE(i))
- break;
- ucval = i < MAX_NR_CONSOLES ? (i+1) : -1;
- goto setint;
- /*
- * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
- * with num >= 1 (switches to vt 0, our console, are not allowed, just
- * to preserve sanity).
- */
- case VT_ACTIVATE:
- if (!perm)
- return -EPERM;
- if (arg == 0 || arg > MAX_NR_CONSOLES)
- return -ENXIO;
- arg--;
- i = vc_allocate(arg);
- if (i)
- return i;
- set_console(arg);
- return 0;
- /*
- * wait until the specified VT has been activated
- */
- case VT_WAITACTIVE:
- if (!perm)
- return -EPERM;
- if (arg == 0 || arg > MAX_NR_CONSOLES)
- return -ENXIO;
- return vt_waitactive(arg-1);
- /*
- * If a vt is under process control, the kernel will not switch to it
- * immediately, but postpone the operation until the process calls this
- * ioctl, allowing the switch to complete.
- *
- * According to the X sources this is the behavior:
- * 0: pending switch-from not OK
- * 1: pending switch-from OK
- * 2: completed switch-to OK
- */
- case VT_RELDISP:
- if (!perm)
- return -EPERM;
- if (vt_cons[console]->vt_mode.mode != VT_PROCESS)
- return -EINVAL;
- /*
- * Switching-from response
- */
- if (vt_cons[console]->vt_newvt >= 0)
- {
- if (arg == 0)
- /*
- * Switch disallowed, so forget we were trying
- * to do it.
- */
- vt_cons[console]->vt_newvt = -1;
- else
- {
- /*
- * The current vt has been released, so
- * complete the switch.
- */
- int newvt = vt_cons[console]->vt_newvt;
- vt_cons[console]->vt_newvt = -1;
- i = vc_allocate(newvt);
- if (i)
- return i;
- /*
- * When we actually do the console switch,
- * make sure we are atomic with respect to
- * other console switches..
- */
- acquire_console_sem();
- complete_change_console(newvt);
- release_console_sem();
- }
- }
- /*
- * Switched-to response
- */
- else
- {
- /*
- * If it's just an ACK, ignore it
- */
- if (arg != VT_ACKACQ)
- return -EINVAL;
- }
- return 0;
- /*
- * Disallocate memory associated to VT (but leave VT1)
- */
- case VT_DISALLOCATE:
- if (arg > MAX_NR_CONSOLES)
- return -ENXIO;
- if (arg == 0) {
- /* disallocate all unused consoles, but leave 0 */
- for (i=1; i<MAX_NR_CONSOLES; i++)
- if (! VT_BUSY(i))
- vc_disallocate(i);
- } else {
- /* disallocate a single console, if possible */
- arg--;
- if (VT_BUSY(arg))
- return -EBUSY;
- if (arg) /* leave 0 */
- vc_disallocate(arg);
- }
- return 0;
- case VT_RESIZE:
- {
- struct vt_sizes *vtsizes = (struct vt_sizes *) arg;
- ushort ll,cc;
- if (!perm)
- return -EPERM;
- if (get_user(ll, &vtsizes->v_rows) ||
- get_user(cc, &vtsizes->v_cols))
- return -EFAULT;
- return vc_resize_all(ll, cc);
- }
- case VT_RESIZEX:
- {
- struct vt_consize *vtconsize = (struct vt_consize *) arg;
- ushort ll,cc,vlin,clin,vcol,ccol;
- if (!perm)
- return -EPERM;
- if (verify_area(VERIFY_READ, (void *)vtconsize,
- sizeof(struct vt_consize)))
- return -EFAULT;
- __get_user(ll, &vtconsize->v_rows);
- __get_user(cc, &vtconsize->v_cols);
- __get_user(vlin, &vtconsize->v_vlin);
- __get_user(clin, &vtconsize->v_clin);
- __get_user(vcol, &vtconsize->v_vcol);
- __get_user(ccol, &vtconsize->v_ccol);
- vlin = vlin ? vlin : video_scan_lines;
- if ( clin )
- {
- if ( ll )
- {
- if ( ll != vlin/clin )
- return -EINVAL; /* Parameters don't add up */
- }
- else
- ll = vlin/clin;
- }
- if ( vcol && ccol )
- {
- if ( cc )
- {
- if ( cc != vcol/ccol )
- return -EINVAL;
- }
- else
- cc = vcol/ccol;
- }
- if ( clin > 32 )
- return -EINVAL;
-
- if ( vlin )
- video_scan_lines = vlin;
- if ( clin )
- video_font_height = clin;
-
- return vc_resize_all(ll, cc);
- }
- case PIO_FONT: {
- struct console_font_op op;
- if (!perm)
- return -EPERM;
- op.op = KD_FONT_OP_SET;
- op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
- op.width = 8;
- op.height = 0;
- op.charcount = 256;
- op.data = (char *) arg;
- return con_font_op(fg_console, &op);
- }
- case GIO_FONT: {
- struct console_font_op op;
- op.op = KD_FONT_OP_GET;
- op.flags = KD_FONT_FLAG_OLD;
- op.width = 8;
- op.height = 32;
- op.charcount = 256;
- op.data = (char *) arg;
- return con_font_op(fg_console, &op);
- }
- case PIO_CMAP:
- if (!perm)
- return -EPERM;
- return con_set_cmap((char *)arg);
- case GIO_CMAP:
- return con_get_cmap((char *)arg);
- case PIO_FONTX:
- case GIO_FONTX:
- return do_fontx_ioctl(cmd, (struct consolefontdesc *)arg, perm);
- case PIO_FONTRESET:
- {
- if (!perm)
- return -EPERM;
- #ifdef BROKEN_GRAPHICS_PROGRAMS
- /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
- font is not saved. */
- return -ENOSYS;
- #else
- {
- struct console_font_op op;
- op.op = KD_FONT_OP_SET_DEFAULT;
- op.data = NULL;
- i = con_font_op(fg_console, &op);
- if (i) return i;
- con_set_default_unimap(fg_console);
- return 0;
- }
- #endif
- }
- case KDFONTOP: {
- struct console_font_op op;
- if (copy_from_user(&op, (void *) arg, sizeof(op)))
- return -EFAULT;
- if (!perm && op.op != KD_FONT_OP_GET)
- return -EPERM;
- i = con_font_op(console, &op);
- if (i) return i;
- if (copy_to_user((void *) arg, &op, sizeof(op)))
- return -EFAULT;
- return 0;
- }
- case PIO_SCRNMAP:
- if (!perm)
- return -EPERM;
- return con_set_trans_old((unsigned char *)arg);
- case GIO_SCRNMAP:
- return con_get_trans_old((unsigned char *)arg);
- case PIO_UNISCRNMAP:
- if (!perm)
- return -EPERM;
- return con_set_trans_new((unsigned short *)arg);
- case GIO_UNISCRNMAP:
- return con_get_trans_new((unsigned short *)arg);
- case PIO_UNIMAPCLR:
- { struct unimapinit ui;
- if (!perm)
- return -EPERM;
- i = copy_from_user(&ui, (void *)arg, sizeof(struct unimapinit));
- if (i) return -EFAULT;
- con_clear_unimap(fg_console, &ui);
- return 0;
- }
- case PIO_UNIMAP:
- case GIO_UNIMAP:
- return do_unimap_ioctl(cmd, (struct unimapdesc *)arg, perm);
- case VT_LOCKSWITCH:
- if (!suser())
- return -EPERM;
- vt_dont_switch = 1;
- return 0;
- case VT_UNLOCKSWITCH:
- if (!suser())
- return -EPERM;
- vt_dont_switch = 0;
- return 0;
- #ifdef CONFIG_FB_COMPAT_XPMAC
- case VC_GETMODE:
- {
- struct vc_mode mode;
- i = verify_area(VERIFY_WRITE, (void *) arg,
- sizeof(struct vc_mode));
- if (i == 0)
- i = console_getmode(&mode);
- if (i)
- return i;
- if (copy_to_user((void *) arg, &mode, sizeof(mode)))
- return -EFAULT;
- return 0;
- }
- case VC_SETMODE:
- case VC_INQMODE:
- {
- struct vc_mode mode;
- if (!perm)
- return -EPERM;
- if (copy_from_user(&mode, (void *) arg, sizeof(mode)))
- return -EFAULT;
- return console_setmode(&mode, cmd == VC_SETMODE);
- }
- case VC_SETCMAP:
- {
- unsigned char cmap[3][256], *p;
- int n_entries, cmap_size, i, j;
- if (!perm)
- return -EPERM;
- if (arg == (unsigned long) VC_POWERMODE_INQUIRY
- || arg <= VESA_POWERDOWN) {
- /* compatibility hack: VC_POWERMODE
- was changed from 0x766a to 0x766c */
- return console_powermode((int) arg);
- }
- if (get_user(cmap_size, (int *) arg))
- return -EFAULT;
- if (cmap_size % 3)
- return -EINVAL;
- n_entries = cmap_size / 3;
- if ((unsigned) n_entries > 256)
- return -EINVAL;
- p = (unsigned char *) (arg + sizeof(int));
- for (j = 0; j < n_entries; ++j)
- for (i = 0; i < 3; ++i)
- if (get_user(cmap[i][j], p++))
- return -EFAULT;
- return console_setcmap(n_entries, cmap[0],
- cmap[1], cmap[2]);
- }
- case VC_GETCMAP:
- /* not implemented yet */
- return -ENOIOCTLCMD;
- case VC_POWERMODE:
- if (!perm)
- return -EPERM;
- return console_powermode((int) arg);
- #endif /* CONFIG_FB_COMPAT_XPMAC */
- default:
- return -ENOIOCTLCMD;
- }
- }
- /*
- * Sometimes we want to wait until a particular VT has been activated. We
- * do it in a very simple manner. Everybody waits on a single queue and
- * get woken up at once. Those that are satisfied go on with their business,
- * while those not ready go back to sleep. Seems overkill to add a wait
- * to each vt just for this - usually this does nothing!
- */
- static DECLARE_WAIT_QUEUE_HEAD(vt_activate_queue);
- /*
- * Sleeps until a vt is activated, or the task is interrupted. Returns
- * 0 if activation, -EINTR if interrupted.
- */
- int vt_waitactive(int vt)
- {
- int retval;
- DECLARE_WAITQUEUE(wait, current);
- add_wait_queue(&vt_activate_queue, &wait);
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- retval = 0;
- if (vt == fg_console)
- break;
- retval = -EINTR;
- if (signal_pending(current))
- break;
- schedule();
- }
- remove_wait_queue(&vt_activate_queue, &wait);
- current->state = TASK_RUNNING;
- return retval;
- }
- #define vt_wake_waitactive() wake_up(&vt_activate_queue)
- void reset_vc(unsigned int new_console)
- {
- vt_cons[new_console]->vc_mode = KD_TEXT;
- kbd_table[new_console].kbdmode = VC_XLATE;
- vt_cons[new_console]->vt_mode.mode = VT_AUTO;
- vt_cons[new_console]->vt_mode.waitv = 0;
- vt_cons[new_console]->vt_mode.relsig = 0;
- vt_cons[new_console]->vt_mode.acqsig = 0;
- vt_cons[new_console]->vt_mode.frsig = 0;
- vt_cons[new_console]->vt_pid = -1;
- vt_cons[new_console]->vt_newvt = -1;
- if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
- reset_palette(new_console) ;
- }
- /*
- * Performs the back end of a vt switch
- */
- void complete_change_console(unsigned int new_console)
- {
- unsigned char old_vc_mode;
- last_console = fg_console;
- /*
- * If we're switching, we could be going from KD_GRAPHICS to
- * KD_TEXT mode or vice versa, which means we need to blank or
- * unblank the screen later.
- */
- old_vc_mode = vt_cons[fg_console]->vc_mode;
- switch_screen(new_console);
- /*
- * This can't appear below a successful kill_proc(). If it did,
- * then the *blank_screen operation could occur while X, having
- * received acqsig, is waking up on another processor. This
- * condition can lead to overlapping accesses to the VGA range
- * and the framebuffer (causing system lockups).
- *
- * To account for this we duplicate this code below only if the
- * controlling process is gone and we've called reset_vc.
- */
- if (old_vc_mode != vt_cons[new_console]->vc_mode)
- {
- if (vt_cons[new_console]->vc_mode == KD_TEXT)
- unblank_screen();
- else
- do_blank_screen(1);
- }
- /*
- * If this new console is under process control, send it a signal
- * telling it that it has acquired. Also check if it has died and
- * clean up (similar to logic employed in change_console())
- */
- if (vt_cons[new_console]->vt_mode.mode == VT_PROCESS)
- {
- /*
- * Send the signal as privileged - kill_proc() will
- * tell us if the process has gone or something else
- * is awry
- */
- if (kill_proc(vt_cons[new_console]->vt_pid,
- vt_cons[new_console]->vt_mode.acqsig,
- 1) != 0)
- {
- /*
- * The controlling process has died, so we revert back to
- * normal operation. In this case, we'll also change back
- * to KD_TEXT mode. I'm not sure if this is strictly correct
- * but it saves the agony when the X server dies and the screen
- * remains blanked due to KD_GRAPHICS! It would be nice to do
- * this outside of VT_PROCESS but there is no single process
- * to account for and tracking tty count may be undesirable.
- */
- reset_vc(new_console);
- if (old_vc_mode != vt_cons[new_console]->vc_mode)
- {
- if (vt_cons[new_console]->vc_mode == KD_TEXT)
- unblank_screen();
- else
- do_blank_screen(1);
- }
- }
- }
- /*
- * Wake anyone waiting for their VT to activate
- */
- vt_wake_waitactive();
- return;
- }
- /*
- * Performs the front-end of a vt switch
- */
- void change_console(unsigned int new_console)
- {
- if ((new_console == fg_console) || (vt_dont_switch))
- return;
- if (!vc_cons_allocated(new_console))
- return;
- /*
- * If this vt is in process mode, then we need to handshake with
- * that process before switching. Essentially, we store where that
- * vt wants to switch to and wait for it to tell us when it's done
- * (via VT_RELDISP ioctl).
- *
- * We also check to see if the controlling process still exists.
- * If it doesn't, we reset this vt to auto mode and continue.
- * This is a cheap way to track process control. The worst thing
- * that can happen is: we send a signal to a process, it dies, and
- * the switch gets "lost" waiting for a response; hopefully, the
- * user will try again, we'll detect the process is gone (unless
- * the user waits just the right amount of time :-) and revert the
- * vt to auto control.
- */
- if (vt_cons[fg_console]->vt_mode.mode == VT_PROCESS)
- {
- /*
- * Send the signal as privileged - kill_proc() will
- * tell us if the process has gone or something else
- * is awry
- */
- if (kill_proc(vt_cons[fg_console]->vt_pid,
- vt_cons[fg_console]->vt_mode.relsig,
- 1) == 0)
- {
- /*
- * It worked. Mark the vt to switch to and
- * return. The process needs to send us a
- * VT_RELDISP ioctl to complete the switch.
- */
- vt_cons[fg_console]->vt_newvt = new_console;
- return;
- }
- /*
- * The controlling process has died, so we revert back to
- * normal operation. In this case, we'll also change back
- * to KD_TEXT mode. I'm not sure if this is strictly correct
- * but it saves the agony when the X server dies and the screen
- * remains blanked due to KD_GRAPHICS! It would be nice to do
- * this outside of VT_PROCESS but there is no single process
- * to account for and tracking tty count may be undesirable.
- */
- reset_vc(fg_console);
- /*
- * Fall through to normal (VT_AUTO) handling of the switch...
- */
- }
- /*
- * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
- */
- if (vt_cons[fg_console]->vc_mode == KD_GRAPHICS)
- return;
- complete_change_console(new_console);
- }