2 * linux/drivers/char/vt_ioctl.c
4 * Copyright (C) 1992 obz under the linux copyright
6 * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
7 * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
8 * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
9 * Some code moved for less code duplication - Andi Kleen - Mar 1997
10 * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <linux/sched.h>
16 #include <linux/tty.h>
17 #include <linux/timer.h>
18 #include <linux/kernel.h>
19 #include <linux/compat.h>
20 #include <linux/module.h>
23 #include <linux/string.h>
24 #include <linux/slab.h>
25 #include <linux/major.h>
27 #include <linux/console.h>
28 #include <linux/consolemap.h>
29 #include <linux/signal.h>
30 #include <linux/smp_lock.h>
31 #include <linux/timex.h>
34 #include <asm/uaccess.h>
36 #include <linux/kbd_kern.h>
37 #include <linux/vt_kern.h>
38 #include <linux/kbd_diacr.h>
39 #include <linux/selection.h>
42 extern struct tty_driver *console_driver;
44 #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
45 #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons)
48 * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
49 * experimentation and study of X386 SYSV handling.
51 * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
52 * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
53 * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
54 * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
55 * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
56 * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
57 * to the current console is done by the main ioctl code.
61 #include <linux/syscalls.h>
64 static void complete_change_console(struct vc_data *vc);
67 * User space VT_EVENT handlers
70 struct vt_event_wait {
71 struct list_head list;
72 struct vt_event event;
76 static LIST_HEAD(vt_events);
77 static DEFINE_SPINLOCK(vt_event_lock);
78 static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
82 * @event: the event that occurred
86 * Post an VT event to interested VT handlers
89 void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
91 struct list_head *pos, *head;
95 spin_lock_irqsave(&vt_event_lock, flags);
98 list_for_each(pos, head) {
99 struct vt_event_wait *ve = list_entry(pos,
100 struct vt_event_wait, list);
101 if (!(ve->event.event & event))
103 ve->event.event = event;
104 /* kernel view is consoles 0..n-1, user space view is
105 console 1..n with 0 meaning current, so we must bias */
106 ve->event.oldev = old + 1;
107 ve->event.newev = new + 1;
111 spin_unlock_irqrestore(&vt_event_lock, flags);
113 wake_up_interruptible(&vt_event_waitqueue);
117 * vt_event_wait - wait for an event
120 * Waits for an event to occur which completes our vt_event_wait
121 * structure. On return the structure has wv->done set to 1 for success
122 * or 0 if some event such as a signal ended the wait.
125 static void vt_event_wait(struct vt_event_wait *vw)
128 /* Prepare the event */
129 INIT_LIST_HEAD(&vw->list);
131 /* Queue our event */
132 spin_lock_irqsave(&vt_event_lock, flags);
133 list_add(&vw->list, &vt_events);
134 spin_unlock_irqrestore(&vt_event_lock, flags);
135 /* Wait for it to pass */
136 wait_event_interruptible_tty(vt_event_waitqueue, vw->done);
138 spin_lock_irqsave(&vt_event_lock, flags);
140 spin_unlock_irqrestore(&vt_event_lock, flags);
144 * vt_event_wait_ioctl - event ioctl handler
145 * @arg: argument to ioctl
147 * Implement the VT_WAITEVENT ioctl using the VT event interface
150 static int vt_event_wait_ioctl(struct vt_event __user *event)
152 struct vt_event_wait vw;
154 if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
156 /* Highest supported event for now */
157 if (vw.event.event & ~VT_MAX_EVENT)
161 /* If it occurred report it */
163 if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
171 * vt_waitactive - active console wait
175 * Helper for event waits. Used to implement the legacy
176 * event waiting ioctls in terms of events
179 int vt_waitactive(int n)
181 struct vt_event_wait vw;
183 if (n == fg_console + 1)
185 vw.event.event = VT_EVENT_SWITCH;
189 } while (vw.event.newev != n);
194 * these are the valid i/o ports we're allowed to change. they map all the
197 #define GPFIRST 0x3b4
199 #define GPNUM (GPLAST - GPFIRST + 1)
201 #define i (tmp.kb_index)
202 #define s (tmp.kb_table)
203 #define v (tmp.kb_value)
205 do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd)
208 ushort *key_map, val, ov;
210 if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
213 if (!capable(CAP_SYS_TTY_CONFIG))
218 key_map = key_maps[s];
221 if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
224 val = (i ? K_HOLE : K_NOSUCHMAP);
225 return put_user(val, &user_kbe->kb_value);
229 if (!i && v == K_NOSUCHMAP) {
231 key_map = key_maps[s];
234 if (key_map[0] == U(K_ALLOCATED)) {
242 if (KTYP(v) < NR_TYPES) {
243 if (KVAL(v) > max_vals[KTYP(v)])
246 if (kbd->kbdmode != VC_UNICODE)
249 /* ++Geert: non-PC keyboards may generate keycode zero */
250 #if !defined(__mc68000__) && !defined(__powerpc__)
251 /* assignment to entry 0 only tests validity of args */
256 if (!(key_map = key_maps[s])) {
259 if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
260 !capable(CAP_SYS_RESOURCE))
263 key_map = kmalloc(sizeof(plain_map),
267 key_maps[s] = key_map;
268 key_map[0] = U(K_ALLOCATED);
269 for (j = 1; j < NR_KEYS; j++)
270 key_map[j] = U(K_HOLE);
275 break; /* nothing to do */
279 if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN))
282 if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT))
283 compute_shiftstate();
293 do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm)
295 struct kbkeycode tmp;
298 if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
302 kc = getkeycode(tmp.scancode);
304 kc = put_user(kc, &user_kbkc->keycode);
309 kc = setkeycode(tmp.scancode, tmp.keycode);
316 do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
318 struct kbsentry *kbs;
324 char *first_free, *fj, *fnw;
328 if (!capable(CAP_SYS_TTY_CONFIG))
331 kbs = kmalloc(sizeof(*kbs), GFP_KERNEL);
337 /* we mostly copy too much here (512bytes), but who cares ;) */
338 if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) {
342 kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0';
347 sz = sizeof(kbs->kb_string) - 1; /* sz should have been
349 up = user_kdgkb->kb_string;
352 for ( ; *p && sz; p++, sz--)
353 if (put_user(*p, up++)) {
357 if (put_user('\0', up)) {
362 return ((p && *p) ? -EOVERFLOW : 0);
370 first_free = funcbufptr + (funcbufsize - funcbufleft);
371 for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++)
378 delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string);
379 if (delta <= funcbufleft) { /* it fits in current buf */
380 if (j < MAX_NR_FUNC) {
381 memmove(fj + delta, fj, first_free - fj);
382 for (k = j; k < MAX_NR_FUNC; k++)
384 func_table[k] += delta;
388 funcbufleft -= delta;
389 } else { /* allocate a larger buffer */
391 while (sz < funcbufsize - funcbufleft + delta)
393 fnw = kmalloc(sz, GFP_KERNEL);
402 memmove(fnw, funcbufptr, fj - funcbufptr);
403 for (k = 0; k < j; k++)
405 func_table[k] = fnw + (func_table[k] - funcbufptr);
407 if (first_free > fj) {
408 memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
409 for (k = j; k < MAX_NR_FUNC; k++)
411 func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
413 if (funcbufptr != func_buf)
416 funcbufleft = funcbufleft - delta + sz - funcbufsize;
419 strcpy(func_table[i], kbs->kb_string);
429 do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
431 struct consolefontdesc cfdarg;
434 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
441 op->op = KD_FONT_OP_SET;
442 op->flags = KD_FONT_FLAG_OLD;
444 op->height = cfdarg.charheight;
445 op->charcount = cfdarg.charcount;
446 op->data = cfdarg.chardata;
447 return con_font_op(vc_cons[fg_console].d, op);
449 op->op = KD_FONT_OP_GET;
450 op->flags = KD_FONT_FLAG_OLD;
452 op->height = cfdarg.charheight;
453 op->charcount = cfdarg.charcount;
454 op->data = cfdarg.chardata;
455 i = con_font_op(vc_cons[fg_console].d, op);
458 cfdarg.charheight = op->height;
459 cfdarg.charcount = op->charcount;
460 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
469 do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
471 struct unimapdesc tmp;
473 if (copy_from_user(&tmp, user_ud, sizeof tmp))
476 if (!access_ok(VERIFY_WRITE, tmp.entries,
477 tmp.entry_ct*sizeof(struct unipair)))
483 return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
485 if (!perm && fg_console != vc->vc_num)
487 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
495 * We handle the console-specific ioctl's here. We allow the
496 * capability to modify any console, not just the fg_console.
498 int vt_ioctl(struct tty_struct *tty, struct file * file,
499 unsigned int cmd, unsigned long arg)
501 struct vc_data *vc = tty->driver_data;
502 struct console_font_op op; /* used in multiple places here */
503 struct kbd_struct * kbd;
504 unsigned int console;
507 void __user *up = (void __user *)arg;
511 console = vc->vc_num;
515 if (!vc_cons_allocated(console)) { /* impossible? */
522 * To have permissions to do most of the vt ioctls, we either have
523 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
526 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
529 kbd = kbd_table + console;
532 ret = tioclinux(tty, arg);
538 * The use of PIT_TICK_RATE is historic, it used to be
539 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
540 * and 2.6.36, which was a minor but unfortunate ABI
544 arg = PIT_TICK_RATE / arg;
552 unsigned int ticks, count;
555 * Generate the tone for the appropriate number of ticks.
556 * If the time is zero, turn off sound ourselves.
558 ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
559 count = ticks ? (arg & 0xffff) : 0;
561 count = PIT_TICK_RATE / count;
562 kd_mksound(count, ticks);
574 * These cannot be implemented on any machine that implements
575 * ioperm() in user level (such as Alpha PCs) or not at all.
577 * XXX: you should never use these, just call ioperm directly..
583 * KDADDIO and KDDELIO may be able to add ports beyond what
584 * we reject here, but to be safe...
586 if (arg < GPFIRST || arg > GPLAST) {
590 ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
595 ret = sys_ioperm(GPFIRST, GPNUM,
596 (cmd == KDENABIO)) ? -ENXIO : 0;
600 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
604 struct kbd_repeat kbrep;
606 if (!capable(CAP_SYS_TTY_CONFIG))
609 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
613 ret = kbd_rate(&kbrep);
616 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
623 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
624 * doesn't do a whole lot. i'm not sure if it should do any
625 * restoration of modes or what...
627 * XXX It should at least call into the driver, fbdev's definitely
628 * need to restore their engine state. --BenH
644 if (vc->vc_mode == (unsigned char) arg)
646 vc->vc_mode = (unsigned char) arg;
647 if (console != fg_console)
650 * explicitly blank/unblank the screen if switching modes
652 acquire_console_sem();
654 do_unblank_screen(1);
657 release_console_sem();
667 * these work like a combination of mmap and KDENABIO.
668 * this could be easily finished.
678 kbd->kbdmode = VC_RAW;
681 kbd->kbdmode = VC_MEDIUMRAW;
684 kbd->kbdmode = VC_XLATE;
685 compute_shiftstate();
688 kbd->kbdmode = VC_UNICODE;
689 compute_shiftstate();
695 tty_ldisc_flush(tty);
699 uival = ((kbd->kbdmode == VC_RAW) ? K_RAW :
700 (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW :
701 (kbd->kbdmode == VC_UNICODE) ? K_UNICODE :
705 /* this could be folded into KDSKBMODE, but for compatibility
706 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
710 clr_vc_kbd_mode(kbd, VC_META);
713 set_vc_kbd_mode(kbd, VC_META);
721 uival = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
723 ret = put_user(uival, (int __user *)arg);
728 if(!capable(CAP_SYS_TTY_CONFIG))
730 ret = do_kbkeycode_ioctl(cmd, up, perm);
735 ret = do_kdsk_ioctl(cmd, up, perm, kbd);
740 ret = do_kdgkb_ioctl(cmd, up, perm);
745 struct kbdiacrs __user *a = up;
746 struct kbdiacr diacr;
749 if (put_user(accent_table_size, &a->kb_cnt)) {
753 for (i = 0; i < accent_table_size; i++) {
754 diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr);
755 diacr.base = conv_uni_to_8bit(accent_table[i].base);
756 diacr.result = conv_uni_to_8bit(accent_table[i].result);
757 if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) {
766 struct kbdiacrsuc __user *a = up;
768 if (put_user(accent_table_size, &a->kb_cnt))
770 else if (copy_to_user(a->kbdiacruc, accent_table,
771 accent_table_size*sizeof(struct kbdiacruc)))
778 struct kbdiacrs __user *a = up;
779 struct kbdiacr diacr;
785 if (get_user(ct,&a->kb_cnt)) {
789 if (ct >= MAX_DIACR) {
793 accent_table_size = ct;
794 for (i = 0; i < ct; i++) {
795 if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) {
799 accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr);
800 accent_table[i].base = conv_8bit_to_uni(diacr.base);
801 accent_table[i].result = conv_8bit_to_uni(diacr.result);
808 struct kbdiacrsuc __user *a = up;
813 if (get_user(ct,&a->kb_cnt)) {
817 if (ct >= MAX_DIACR) {
821 accent_table_size = ct;
822 if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc)))
827 /* the ioctls below read/set the flags usually shown in the leds */
828 /* don't use them - they will go away without warning */
830 ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
840 kbd->ledflagstate = (arg & 7);
841 kbd->default_ledflagstate = ((arg >> 4) & 7);
845 /* the ioctls below only set the lights, not the functions */
846 /* for those, see KDGKBLED and KDSKBLED above */
848 ucval = getledstate();
850 ret = put_user(ucval, (char __user *)arg);
856 setledstate(kbd, arg);
860 * A process can indicate its willingness to accept signals
861 * generated by pressing an appropriate key combination.
862 * Thus, one can have a daemon that e.g. spawns a new console
863 * upon a keypress and then changes to it.
864 * See also the kbrequest field of inittab(5).
868 if (!perm || !capable(CAP_KILL))
870 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
873 spin_lock_irq(&vt_spawn_con.lock);
874 put_pid(vt_spawn_con.pid);
875 vt_spawn_con.pid = get_pid(task_pid(current));
876 vt_spawn_con.sig = arg;
877 spin_unlock_irq(&vt_spawn_con.lock);
888 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
892 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
896 acquire_console_sem();
898 /* the frsig is ignored, so we set it to 0 */
899 vc->vt_mode.frsig = 0;
901 vc->vt_pid = get_pid(task_pid(current));
902 /* no switch is required -- saw@shade.msu.ru */
904 release_console_sem();
913 acquire_console_sem();
914 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
915 release_console_sem();
917 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
924 * Returns global vt state. Note that VT 0 is always open, since
925 * it's an alias for the current VT, and people can't use it here.
926 * We cannot return state for more than 16 VTs, since v_state is short.
930 struct vt_stat __user *vtstat = up;
931 unsigned short state, mask;
933 if (put_user(fg_console + 1, &vtstat->v_active))
936 state = 1; /* /dev/tty0 is always open */
937 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
941 ret = put_user(state, &vtstat->v_state);
947 * Returns the first available (non-opened) console.
950 for (i = 0; i < MAX_NR_CONSOLES; ++i)
951 if (! VT_IS_IN_USE(i))
953 uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
957 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
958 * with num >= 1 (switches to vt 0, our console, are not allowed, just
959 * to preserve sanity).
964 if (arg == 0 || arg > MAX_NR_CONSOLES)
968 acquire_console_sem();
969 ret = vc_allocate(arg);
970 release_console_sem();
979 struct vt_setactivate vsa;
984 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
985 sizeof(struct vt_setactivate))) {
989 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
993 acquire_console_sem();
994 ret = vc_allocate(vsa.console);
997 /* This is safe providing we don't drop the
998 console sem between vc_allocate and
999 finishing referencing nvc */
1000 nvc = vc_cons[vsa.console].d;
1001 nvc->vt_mode = vsa.mode;
1002 nvc->vt_mode.frsig = 0;
1003 put_pid(nvc->vt_pid);
1004 nvc->vt_pid = get_pid(task_pid(current));
1006 release_console_sem();
1009 /* Commence switch and lock */
1015 * wait until the specified VT has been activated
1020 if (arg == 0 || arg > MAX_NR_CONSOLES)
1023 ret = vt_waitactive(arg);
1027 * If a vt is under process control, the kernel will not switch to it
1028 * immediately, but postpone the operation until the process calls this
1029 * ioctl, allowing the switch to complete.
1031 * According to the X sources this is the behavior:
1032 * 0: pending switch-from not OK
1033 * 1: pending switch-from OK
1034 * 2: completed switch-to OK
1040 if (vc->vt_mode.mode != VT_PROCESS) {
1045 * Switching-from response
1047 acquire_console_sem();
1048 if (vc->vt_newvt >= 0) {
1051 * Switch disallowed, so forget we were trying
1058 * The current vt has been released, so
1059 * complete the switch.
1062 newvt = vc->vt_newvt;
1064 ret = vc_allocate(newvt);
1066 release_console_sem();
1070 * When we actually do the console switch,
1071 * make sure we are atomic with respect to
1072 * other console switches..
1074 complete_change_console(vc_cons[newvt].d);
1078 * Switched-to response
1081 * If it's just an ACK, ignore it
1083 if (arg != VT_ACKACQ)
1086 release_console_sem();
1090 * Disallocate memory associated to VT (but leave VT1)
1092 case VT_DISALLOCATE:
1093 if (arg > MAX_NR_CONSOLES) {
1098 /* deallocate all unused consoles, but leave 0 */
1099 acquire_console_sem();
1100 for (i=1; i<MAX_NR_CONSOLES; i++)
1103 release_console_sem();
1105 /* deallocate a single console, if possible */
1109 else if (arg) { /* leave 0 */
1110 acquire_console_sem();
1112 release_console_sem();
1119 struct vt_sizes __user *vtsizes = up;
1125 if (get_user(ll, &vtsizes->v_rows) ||
1126 get_user(cc, &vtsizes->v_cols))
1129 acquire_console_sem();
1130 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1134 vc->vc_resize_user = 1;
1135 vc_resize(vc_cons[i].d, cc, ll);
1138 release_console_sem();
1145 struct vt_consize __user *vtconsize = up;
1146 ushort ll,cc,vlin,clin,vcol,ccol;
1149 if (!access_ok(VERIFY_READ, vtconsize,
1150 sizeof(struct vt_consize))) {
1154 /* FIXME: Should check the copies properly */
1155 __get_user(ll, &vtconsize->v_rows);
1156 __get_user(cc, &vtconsize->v_cols);
1157 __get_user(vlin, &vtconsize->v_vlin);
1158 __get_user(clin, &vtconsize->v_clin);
1159 __get_user(vcol, &vtconsize->v_vcol);
1160 __get_user(ccol, &vtconsize->v_ccol);
1161 vlin = vlin ? vlin : vc->vc_scan_lines;
1164 if (ll != vlin/clin) {
1165 /* Parameters don't add up */
1174 if (cc != vcol/ccol) {
1187 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1190 acquire_console_sem();
1192 vc_cons[i].d->vc_scan_lines = vlin;
1194 vc_cons[i].d->vc_font.height = clin;
1195 vc_cons[i].d->vc_resize_user = 1;
1196 vc_resize(vc_cons[i].d, cc, ll);
1197 release_console_sem();
1205 op.op = KD_FONT_OP_SET;
1206 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
1211 ret = con_font_op(vc_cons[fg_console].d, &op);
1216 op.op = KD_FONT_OP_GET;
1217 op.flags = KD_FONT_FLAG_OLD;
1222 ret = con_font_op(vc_cons[fg_console].d, &op);
1230 ret = con_set_cmap(up);
1234 ret = con_get_cmap(up);
1239 ret = do_fontx_ioctl(cmd, up, perm, &op);
1247 #ifdef BROKEN_GRAPHICS_PROGRAMS
1248 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
1249 font is not saved. */
1254 op.op = KD_FONT_OP_SET_DEFAULT;
1256 ret = con_font_op(vc_cons[fg_console].d, &op);
1259 con_set_default_unimap(vc_cons[fg_console].d);
1266 if (copy_from_user(&op, up, sizeof(op))) {
1270 if (!perm && op.op != KD_FONT_OP_GET)
1272 ret = con_font_op(vc, &op);
1275 if (copy_to_user(up, &op, sizeof(op)))
1284 ret = con_set_trans_old(up);
1288 ret = con_get_trans_old(up);
1291 case PIO_UNISCRNMAP:
1295 ret = con_set_trans_new(up);
1298 case GIO_UNISCRNMAP:
1299 ret = con_get_trans_new(up);
1303 { struct unimapinit ui;
1306 ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
1310 con_clear_unimap(vc, &ui);
1316 ret = do_unimap_ioctl(cmd, up, perm, vc);
1320 if (!capable(CAP_SYS_TTY_CONFIG))
1324 case VT_UNLOCKSWITCH:
1325 if (!capable(CAP_SYS_TTY_CONFIG))
1329 case VT_GETHIFONTMASK:
1330 ret = put_user(vc->vc_hi_font_mask,
1331 (unsigned short __user *)arg);
1334 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1347 void reset_vc(struct vc_data *vc)
1349 vc->vc_mode = KD_TEXT;
1350 kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
1351 vc->vt_mode.mode = VT_AUTO;
1352 vc->vt_mode.waitv = 0;
1353 vc->vt_mode.relsig = 0;
1354 vc->vt_mode.acqsig = 0;
1355 vc->vt_mode.frsig = 0;
1356 put_pid(vc->vt_pid);
1359 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1363 void vc_SAK(struct work_struct *work)
1366 container_of(work, struct vc, SAK_work);
1368 struct tty_struct *tty;
1370 acquire_console_sem();
1375 * SAK should also work in all raw modes and reset
1382 release_console_sem();
1385 #ifdef CONFIG_COMPAT
1387 struct compat_consolefontdesc {
1388 unsigned short charcount; /* characters in font (256 or 512) */
1389 unsigned short charheight; /* scan lines per character (1-32) */
1390 compat_caddr_t chardata; /* font data in expanded form */
1394 compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1395 int perm, struct console_font_op *op)
1397 struct compat_consolefontdesc cfdarg;
1400 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1407 op->op = KD_FONT_OP_SET;
1408 op->flags = KD_FONT_FLAG_OLD;
1410 op->height = cfdarg.charheight;
1411 op->charcount = cfdarg.charcount;
1412 op->data = compat_ptr(cfdarg.chardata);
1413 return con_font_op(vc_cons[fg_console].d, op);
1415 op->op = KD_FONT_OP_GET;
1416 op->flags = KD_FONT_FLAG_OLD;
1418 op->height = cfdarg.charheight;
1419 op->charcount = cfdarg.charcount;
1420 op->data = compat_ptr(cfdarg.chardata);
1421 i = con_font_op(vc_cons[fg_console].d, op);
1424 cfdarg.charheight = op->height;
1425 cfdarg.charcount = op->charcount;
1426 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1433 struct compat_console_font_op {
1434 compat_uint_t op; /* operation code KD_FONT_OP_* */
1435 compat_uint_t flags; /* KD_FONT_FLAG_* */
1436 compat_uint_t width, height; /* font size */
1437 compat_uint_t charcount;
1438 compat_caddr_t data; /* font data with height fixed to 32 */
1442 compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1443 int perm, struct console_font_op *op, struct vc_data *vc)
1447 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1449 if (!perm && op->op != KD_FONT_OP_GET)
1451 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
1452 op->flags |= KD_FONT_FLAG_OLD;
1453 i = con_font_op(vc, op);
1456 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1457 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1462 struct compat_unimapdesc {
1463 unsigned short entry_ct;
1464 compat_caddr_t entries;
1468 compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1469 int perm, struct vc_data *vc)
1471 struct compat_unimapdesc tmp;
1472 struct unipair __user *tmp_entries;
1474 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1476 tmp_entries = compat_ptr(tmp.entries);
1478 if (!access_ok(VERIFY_WRITE, tmp_entries,
1479 tmp.entry_ct*sizeof(struct unipair)))
1485 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1487 if (!perm && fg_console != vc->vc_num)
1489 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1494 long vt_compat_ioctl(struct tty_struct *tty, struct file * file,
1495 unsigned int cmd, unsigned long arg)
1497 struct vc_data *vc = tty->driver_data;
1498 struct console_font_op op; /* used in multiple places here */
1499 struct kbd_struct *kbd;
1500 unsigned int console;
1501 void __user *up = (void __user *)arg;
1505 console = vc->vc_num;
1509 if (!vc_cons_allocated(console)) { /* impossible? */
1515 * To have permissions to do most of the vt ioctls, we either have
1516 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1519 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1522 kbd = kbd_table + console;
1525 * these need special handlers for incompatible data structures
1529 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1533 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1538 ret = compat_unimap_ioctl(cmd, up, perm, vc);
1542 * all these treat 'arg' as an integer
1561 case VT_DISALLOCATE:
1567 * the rest has a compatible data structure behind arg,
1568 * but we have to convert it to a proper 64 bit pointer.
1571 arg = (unsigned long)compat_ptr(arg);
1580 return vt_ioctl(tty, file, cmd, arg);
1584 #endif /* CONFIG_COMPAT */
1588 * Performs the back end of a vt switch. Called under the console
1591 static void complete_change_console(struct vc_data *vc)
1593 unsigned char old_vc_mode;
1594 int old = fg_console;
1596 last_console = fg_console;
1599 * If we're switching, we could be going from KD_GRAPHICS to
1600 * KD_TEXT mode or vice versa, which means we need to blank or
1601 * unblank the screen later.
1603 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1607 * This can't appear below a successful kill_pid(). If it did,
1608 * then the *blank_screen operation could occur while X, having
1609 * received acqsig, is waking up on another processor. This
1610 * condition can lead to overlapping accesses to the VGA range
1611 * and the framebuffer (causing system lockups).
1613 * To account for this we duplicate this code below only if the
1614 * controlling process is gone and we've called reset_vc.
1616 if (old_vc_mode != vc->vc_mode) {
1617 if (vc->vc_mode == KD_TEXT)
1618 do_unblank_screen(1);
1624 * If this new console is under process control, send it a signal
1625 * telling it that it has acquired. Also check if it has died and
1626 * clean up (similar to logic employed in change_console())
1628 if (vc->vt_mode.mode == VT_PROCESS) {
1630 * Send the signal as privileged - kill_pid() will
1631 * tell us if the process has gone or something else
1634 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1636 * The controlling process has died, so we revert back to
1637 * normal operation. In this case, we'll also change back
1638 * to KD_TEXT mode. I'm not sure if this is strictly correct
1639 * but it saves the agony when the X server dies and the screen
1640 * remains blanked due to KD_GRAPHICS! It would be nice to do
1641 * this outside of VT_PROCESS but there is no single process
1642 * to account for and tracking tty count may be undesirable.
1646 if (old_vc_mode != vc->vc_mode) {
1647 if (vc->vc_mode == KD_TEXT)
1648 do_unblank_screen(1);
1656 * Wake anyone waiting for their VT to activate
1658 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
1663 * Performs the front-end of a vt switch
1665 void change_console(struct vc_data *new_vc)
1669 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1673 * If this vt is in process mode, then we need to handshake with
1674 * that process before switching. Essentially, we store where that
1675 * vt wants to switch to and wait for it to tell us when it's done
1676 * (via VT_RELDISP ioctl).
1678 * We also check to see if the controlling process still exists.
1679 * If it doesn't, we reset this vt to auto mode and continue.
1680 * This is a cheap way to track process control. The worst thing
1681 * that can happen is: we send a signal to a process, it dies, and
1682 * the switch gets "lost" waiting for a response; hopefully, the
1683 * user will try again, we'll detect the process is gone (unless
1684 * the user waits just the right amount of time :-) and revert the
1685 * vt to auto control.
1687 vc = vc_cons[fg_console].d;
1688 if (vc->vt_mode.mode == VT_PROCESS) {
1690 * Send the signal as privileged - kill_pid() will
1691 * tell us if the process has gone or something else
1694 * We need to set vt_newvt *before* sending the signal or we
1697 vc->vt_newvt = new_vc->vc_num;
1698 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1700 * It worked. Mark the vt to switch to and
1701 * return. The process needs to send us a
1702 * VT_RELDISP ioctl to complete the switch.
1708 * The controlling process has died, so we revert back to
1709 * normal operation. In this case, we'll also change back
1710 * to KD_TEXT mode. I'm not sure if this is strictly correct
1711 * but it saves the agony when the X server dies and the screen
1712 * remains blanked due to KD_GRAPHICS! It would be nice to do
1713 * this outside of VT_PROCESS but there is no single process
1714 * to account for and tracking tty count may be undesirable.
1719 * Fall through to normal (VT_AUTO) handling of the switch...
1724 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1726 if (vc->vc_mode == KD_GRAPHICS)
1729 complete_change_console(new_vc);
1732 /* Perform a kernel triggered VT switch for suspend/resume */
1734 static int disable_vt_switch;
1736 int vt_move_to_console(unsigned int vt, int alloc)
1740 acquire_console_sem();
1741 /* Graphics mode - up to X */
1742 if (disable_vt_switch) {
1743 release_console_sem();
1748 if (alloc && vc_allocate(vt)) {
1749 /* we can't have a free VC for now. Too bad,
1750 * we don't want to mess the screen for now. */
1751 release_console_sem();
1755 if (set_console(vt)) {
1757 * We're unable to switch to the SUSPEND_CONSOLE.
1758 * Let the calling function know so it can decide
1761 release_console_sem();
1764 release_console_sem();
1766 if (vt_waitactive(vt + 1)) {
1767 pr_debug("Suspend: Can't switch VCs.");
1776 * Normally during a suspend, we allocate a new console and switch to it.
1777 * When we resume, we switch back to the original console. This switch
1778 * can be slow, so on systems where the framebuffer can handle restoration
1779 * of video registers anyways, there's little point in doing the console
1780 * switch. This function allows you to disable it by passing it '0'.
1782 void pm_set_vt_switch(int do_switch)
1784 acquire_console_sem();
1785 disable_vt_switch = !do_switch;
1786 release_console_sem();
1788 EXPORT_SYMBOL(pm_set_vt_switch);