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(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;
506 void __user *up = (void __user *)arg;
510 console = vc->vc_num;
514 if (!vc_cons_allocated(console)) { /* impossible? */
521 * To have permissions to do most of the vt ioctls, we either have
522 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
525 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
528 kbd = kbd_table + console;
531 ret = tioclinux(tty, arg);
536 /* FIXME: This is an old broken API but we need to keep it
537 supported and somehow separate the historic advertised
538 tick rate from any real one */
540 arg = CLOCK_TICK_RATE / arg;
548 unsigned int ticks, count;
551 * Generate the tone for the appropriate number of ticks.
552 * If the time is zero, turn off sound ourselves.
554 ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
555 count = ticks ? (arg & 0xffff) : 0;
556 /* FIXME: This is an old broken API but we need to keep it
557 supported and somehow separate the historic advertised
558 tick rate from any real one */
560 count = CLOCK_TICK_RATE / count;
561 kd_mksound(count, ticks);
573 * These cannot be implemented on any machine that implements
574 * ioperm() in user level (such as Alpha PCs) or not at all.
576 * XXX: you should never use these, just call ioperm directly..
582 * KDADDIO and KDDELIO may be able to add ports beyond what
583 * we reject here, but to be safe...
585 if (arg < GPFIRST || arg > GPLAST) {
589 ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
594 ret = sys_ioperm(GPFIRST, GPNUM,
595 (cmd == KDENABIO)) ? -ENXIO : 0;
599 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
603 struct kbd_repeat kbrep;
605 if (!capable(CAP_SYS_TTY_CONFIG))
608 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
612 ret = kbd_rate(&kbrep);
615 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
622 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
623 * doesn't do a whole lot. i'm not sure if it should do any
624 * restoration of modes or what...
626 * XXX It should at least call into the driver, fbdev's definitely
627 * need to restore their engine state. --BenH
643 if (vc->vc_mode == (unsigned char) arg)
645 vc->vc_mode = (unsigned char) arg;
646 if (console != fg_console)
649 * explicitly blank/unblank the screen if switching modes
651 acquire_console_sem();
653 do_unblank_screen(1);
656 release_console_sem();
666 * these work like a combination of mmap and KDENABIO.
667 * this could be easily finished.
677 kbd->kbdmode = VC_RAW;
680 kbd->kbdmode = VC_MEDIUMRAW;
683 kbd->kbdmode = VC_XLATE;
684 compute_shiftstate();
687 kbd->kbdmode = VC_UNICODE;
688 compute_shiftstate();
694 tty_ldisc_flush(tty);
698 ucval = ((kbd->kbdmode == VC_RAW) ? K_RAW :
699 (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW :
700 (kbd->kbdmode == VC_UNICODE) ? K_UNICODE :
704 /* this could be folded into KDSKBMODE, but for compatibility
705 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
709 clr_vc_kbd_mode(kbd, VC_META);
712 set_vc_kbd_mode(kbd, VC_META);
720 ucval = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
722 ret = put_user(ucval, (int __user *)arg);
727 if(!capable(CAP_SYS_TTY_CONFIG))
729 ret = do_kbkeycode_ioctl(cmd, up, perm);
734 ret = do_kdsk_ioctl(cmd, up, perm, kbd);
739 ret = do_kdgkb_ioctl(cmd, up, perm);
744 struct kbdiacrs __user *a = up;
745 struct kbdiacr diacr;
748 if (put_user(accent_table_size, &a->kb_cnt)) {
752 for (i = 0; i < accent_table_size; i++) {
753 diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr);
754 diacr.base = conv_uni_to_8bit(accent_table[i].base);
755 diacr.result = conv_uni_to_8bit(accent_table[i].result);
756 if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) {
765 struct kbdiacrsuc __user *a = up;
767 if (put_user(accent_table_size, &a->kb_cnt))
769 else if (copy_to_user(a->kbdiacruc, accent_table,
770 accent_table_size*sizeof(struct kbdiacruc)))
777 struct kbdiacrs __user *a = up;
778 struct kbdiacr diacr;
784 if (get_user(ct,&a->kb_cnt)) {
788 if (ct >= MAX_DIACR) {
792 accent_table_size = ct;
793 for (i = 0; i < ct; i++) {
794 if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) {
798 accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr);
799 accent_table[i].base = conv_8bit_to_uni(diacr.base);
800 accent_table[i].result = conv_8bit_to_uni(diacr.result);
807 struct kbdiacrsuc __user *a = up;
812 if (get_user(ct,&a->kb_cnt)) {
816 if (ct >= MAX_DIACR) {
820 accent_table_size = ct;
821 if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc)))
826 /* the ioctls below read/set the flags usually shown in the leds */
827 /* don't use them - they will go away without warning */
829 ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
839 kbd->ledflagstate = (arg & 7);
840 kbd->default_ledflagstate = ((arg >> 4) & 7);
844 /* the ioctls below only set the lights, not the functions */
845 /* for those, see KDGKBLED and KDSKBLED above */
847 ucval = getledstate();
849 ret = put_user(ucval, (char __user *)arg);
855 setledstate(kbd, arg);
859 * A process can indicate its willingness to accept signals
860 * generated by pressing an appropriate key combination.
861 * Thus, one can have a daemon that e.g. spawns a new console
862 * upon a keypress and then changes to it.
863 * See also the kbrequest field of inittab(5).
867 if (!perm || !capable(CAP_KILL))
869 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
872 spin_lock_irq(&vt_spawn_con.lock);
873 put_pid(vt_spawn_con.pid);
874 vt_spawn_con.pid = get_pid(task_pid(current));
875 vt_spawn_con.sig = arg;
876 spin_unlock_irq(&vt_spawn_con.lock);
887 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
891 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
895 acquire_console_sem();
897 /* the frsig is ignored, so we set it to 0 */
898 vc->vt_mode.frsig = 0;
900 vc->vt_pid = get_pid(task_pid(current));
901 /* no switch is required -- saw@shade.msu.ru */
903 release_console_sem();
912 acquire_console_sem();
913 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
914 release_console_sem();
916 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
923 * Returns global vt state. Note that VT 0 is always open, since
924 * it's an alias for the current VT, and people can't use it here.
925 * We cannot return state for more than 16 VTs, since v_state is short.
929 struct vt_stat __user *vtstat = up;
930 unsigned short state, mask;
932 if (put_user(fg_console + 1, &vtstat->v_active))
935 state = 1; /* /dev/tty0 is always open */
936 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
940 ret = put_user(state, &vtstat->v_state);
946 * Returns the first available (non-opened) console.
949 for (i = 0; i < MAX_NR_CONSOLES; ++i)
950 if (! VT_IS_IN_USE(i))
952 ucval = i < MAX_NR_CONSOLES ? (i+1) : -1;
956 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
957 * with num >= 1 (switches to vt 0, our console, are not allowed, just
958 * to preserve sanity).
963 if (arg == 0 || arg > MAX_NR_CONSOLES)
967 acquire_console_sem();
968 ret = vc_allocate(arg);
969 release_console_sem();
978 struct vt_setactivate vsa;
983 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
984 sizeof(struct vt_setactivate))) {
988 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
992 acquire_console_sem();
993 ret = vc_allocate(vsa.console);
996 /* This is safe providing we don't drop the
997 console sem between vc_allocate and
998 finishing referencing nvc */
999 nvc = vc_cons[vsa.console].d;
1000 nvc->vt_mode = vsa.mode;
1001 nvc->vt_mode.frsig = 0;
1002 put_pid(nvc->vt_pid);
1003 nvc->vt_pid = get_pid(task_pid(current));
1005 release_console_sem();
1008 /* Commence switch and lock */
1014 * wait until the specified VT has been activated
1019 if (arg == 0 || arg > MAX_NR_CONSOLES)
1022 ret = vt_waitactive(arg);
1026 * If a vt is under process control, the kernel will not switch to it
1027 * immediately, but postpone the operation until the process calls this
1028 * ioctl, allowing the switch to complete.
1030 * According to the X sources this is the behavior:
1031 * 0: pending switch-from not OK
1032 * 1: pending switch-from OK
1033 * 2: completed switch-to OK
1039 if (vc->vt_mode.mode != VT_PROCESS) {
1044 * Switching-from response
1046 acquire_console_sem();
1047 if (vc->vt_newvt >= 0) {
1050 * Switch disallowed, so forget we were trying
1057 * The current vt has been released, so
1058 * complete the switch.
1061 newvt = vc->vt_newvt;
1063 ret = vc_allocate(newvt);
1065 release_console_sem();
1069 * When we actually do the console switch,
1070 * make sure we are atomic with respect to
1071 * other console switches..
1073 complete_change_console(vc_cons[newvt].d);
1077 * Switched-to response
1080 * If it's just an ACK, ignore it
1082 if (arg != VT_ACKACQ)
1085 release_console_sem();
1089 * Disallocate memory associated to VT (but leave VT1)
1091 case VT_DISALLOCATE:
1092 if (arg > MAX_NR_CONSOLES) {
1097 /* deallocate all unused consoles, but leave 0 */
1098 acquire_console_sem();
1099 for (i=1; i<MAX_NR_CONSOLES; i++)
1102 release_console_sem();
1104 /* deallocate a single console, if possible */
1108 else if (arg) { /* leave 0 */
1109 acquire_console_sem();
1111 release_console_sem();
1118 struct vt_sizes __user *vtsizes = up;
1124 if (get_user(ll, &vtsizes->v_rows) ||
1125 get_user(cc, &vtsizes->v_cols))
1128 acquire_console_sem();
1129 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1133 vc->vc_resize_user = 1;
1134 vc_resize(vc_cons[i].d, cc, ll);
1137 release_console_sem();
1144 struct vt_consize __user *vtconsize = up;
1145 ushort ll,cc,vlin,clin,vcol,ccol;
1148 if (!access_ok(VERIFY_READ, vtconsize,
1149 sizeof(struct vt_consize))) {
1153 /* FIXME: Should check the copies properly */
1154 __get_user(ll, &vtconsize->v_rows);
1155 __get_user(cc, &vtconsize->v_cols);
1156 __get_user(vlin, &vtconsize->v_vlin);
1157 __get_user(clin, &vtconsize->v_clin);
1158 __get_user(vcol, &vtconsize->v_vcol);
1159 __get_user(ccol, &vtconsize->v_ccol);
1160 vlin = vlin ? vlin : vc->vc_scan_lines;
1163 if (ll != vlin/clin) {
1164 /* Parameters don't add up */
1173 if (cc != vcol/ccol) {
1186 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1189 acquire_console_sem();
1191 vc_cons[i].d->vc_scan_lines = vlin;
1193 vc_cons[i].d->vc_font.height = clin;
1194 vc_cons[i].d->vc_resize_user = 1;
1195 vc_resize(vc_cons[i].d, cc, ll);
1196 release_console_sem();
1204 op.op = KD_FONT_OP_SET;
1205 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
1210 ret = con_font_op(vc_cons[fg_console].d, &op);
1215 op.op = KD_FONT_OP_GET;
1216 op.flags = KD_FONT_FLAG_OLD;
1221 ret = con_font_op(vc_cons[fg_console].d, &op);
1229 ret = con_set_cmap(up);
1233 ret = con_get_cmap(up);
1238 ret = do_fontx_ioctl(cmd, up, perm, &op);
1246 #ifdef BROKEN_GRAPHICS_PROGRAMS
1247 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
1248 font is not saved. */
1253 op.op = KD_FONT_OP_SET_DEFAULT;
1255 ret = con_font_op(vc_cons[fg_console].d, &op);
1258 con_set_default_unimap(vc_cons[fg_console].d);
1265 if (copy_from_user(&op, up, sizeof(op))) {
1269 if (!perm && op.op != KD_FONT_OP_GET)
1271 ret = con_font_op(vc, &op);
1274 if (copy_to_user(up, &op, sizeof(op)))
1283 ret = con_set_trans_old(up);
1287 ret = con_get_trans_old(up);
1290 case PIO_UNISCRNMAP:
1294 ret = con_set_trans_new(up);
1297 case GIO_UNISCRNMAP:
1298 ret = con_get_trans_new(up);
1302 { struct unimapinit ui;
1305 ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
1307 con_clear_unimap(vc, &ui);
1313 ret = do_unimap_ioctl(cmd, up, perm, vc);
1317 if (!capable(CAP_SYS_TTY_CONFIG))
1321 case VT_UNLOCKSWITCH:
1322 if (!capable(CAP_SYS_TTY_CONFIG))
1326 case VT_GETHIFONTMASK:
1327 ret = put_user(vc->vc_hi_font_mask,
1328 (unsigned short __user *)arg);
1331 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1344 void reset_vc(struct vc_data *vc)
1346 vc->vc_mode = KD_TEXT;
1347 kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
1348 vc->vt_mode.mode = VT_AUTO;
1349 vc->vt_mode.waitv = 0;
1350 vc->vt_mode.relsig = 0;
1351 vc->vt_mode.acqsig = 0;
1352 vc->vt_mode.frsig = 0;
1353 put_pid(vc->vt_pid);
1356 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1360 void vc_SAK(struct work_struct *work)
1363 container_of(work, struct vc, SAK_work);
1365 struct tty_struct *tty;
1367 acquire_console_sem();
1372 * SAK should also work in all raw modes and reset
1379 release_console_sem();
1382 #ifdef CONFIG_COMPAT
1384 struct compat_consolefontdesc {
1385 unsigned short charcount; /* characters in font (256 or 512) */
1386 unsigned short charheight; /* scan lines per character (1-32) */
1387 compat_caddr_t chardata; /* font data in expanded form */
1391 compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1392 int perm, struct console_font_op *op)
1394 struct compat_consolefontdesc cfdarg;
1397 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1404 op->op = KD_FONT_OP_SET;
1405 op->flags = KD_FONT_FLAG_OLD;
1407 op->height = cfdarg.charheight;
1408 op->charcount = cfdarg.charcount;
1409 op->data = compat_ptr(cfdarg.chardata);
1410 return con_font_op(vc_cons[fg_console].d, op);
1412 op->op = KD_FONT_OP_GET;
1413 op->flags = KD_FONT_FLAG_OLD;
1415 op->height = cfdarg.charheight;
1416 op->charcount = cfdarg.charcount;
1417 op->data = compat_ptr(cfdarg.chardata);
1418 i = con_font_op(vc_cons[fg_console].d, op);
1421 cfdarg.charheight = op->height;
1422 cfdarg.charcount = op->charcount;
1423 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1430 struct compat_console_font_op {
1431 compat_uint_t op; /* operation code KD_FONT_OP_* */
1432 compat_uint_t flags; /* KD_FONT_FLAG_* */
1433 compat_uint_t width, height; /* font size */
1434 compat_uint_t charcount;
1435 compat_caddr_t data; /* font data with height fixed to 32 */
1439 compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1440 int perm, struct console_font_op *op, struct vc_data *vc)
1444 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1446 if (!perm && op->op != KD_FONT_OP_GET)
1448 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
1449 op->flags |= KD_FONT_FLAG_OLD;
1450 i = con_font_op(vc, op);
1453 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1454 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1459 struct compat_unimapdesc {
1460 unsigned short entry_ct;
1461 compat_caddr_t entries;
1465 compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1466 int perm, struct vc_data *vc)
1468 struct compat_unimapdesc tmp;
1469 struct unipair __user *tmp_entries;
1471 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1473 tmp_entries = compat_ptr(tmp.entries);
1475 if (!access_ok(VERIFY_WRITE, tmp_entries,
1476 tmp.entry_ct*sizeof(struct unipair)))
1482 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1484 if (!perm && fg_console != vc->vc_num)
1486 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1491 long vt_compat_ioctl(struct tty_struct *tty, struct file * file,
1492 unsigned int cmd, unsigned long arg)
1494 struct vc_data *vc = tty->driver_data;
1495 struct console_font_op op; /* used in multiple places here */
1496 struct kbd_struct *kbd;
1497 unsigned int console;
1498 void __user *up = (void __user *)arg;
1502 console = vc->vc_num;
1506 if (!vc_cons_allocated(console)) { /* impossible? */
1512 * To have permissions to do most of the vt ioctls, we either have
1513 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1516 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1519 kbd = kbd_table + console;
1522 * these need special handlers for incompatible data structures
1526 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1530 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1535 ret = compat_unimap_ioctl(cmd, up, perm, vc);
1539 * all these treat 'arg' as an integer
1558 case VT_DISALLOCATE:
1564 * the rest has a compatible data structure behind arg,
1565 * but we have to convert it to a proper 64 bit pointer.
1568 arg = (unsigned long)compat_ptr(arg);
1577 return vt_ioctl(tty, file, cmd, arg);
1581 #endif /* CONFIG_COMPAT */
1585 * Performs the back end of a vt switch. Called under the console
1588 static void complete_change_console(struct vc_data *vc)
1590 unsigned char old_vc_mode;
1591 int old = fg_console;
1593 last_console = fg_console;
1596 * If we're switching, we could be going from KD_GRAPHICS to
1597 * KD_TEXT mode or vice versa, which means we need to blank or
1598 * unblank the screen later.
1600 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1604 * This can't appear below a successful kill_pid(). If it did,
1605 * then the *blank_screen operation could occur while X, having
1606 * received acqsig, is waking up on another processor. This
1607 * condition can lead to overlapping accesses to the VGA range
1608 * and the framebuffer (causing system lockups).
1610 * To account for this we duplicate this code below only if the
1611 * controlling process is gone and we've called reset_vc.
1613 if (old_vc_mode != vc->vc_mode) {
1614 if (vc->vc_mode == KD_TEXT)
1615 do_unblank_screen(1);
1621 * If this new console is under process control, send it a signal
1622 * telling it that it has acquired. Also check if it has died and
1623 * clean up (similar to logic employed in change_console())
1625 if (vc->vt_mode.mode == VT_PROCESS) {
1627 * Send the signal as privileged - kill_pid() will
1628 * tell us if the process has gone or something else
1631 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1633 * The controlling process has died, so we revert back to
1634 * normal operation. In this case, we'll also change back
1635 * to KD_TEXT mode. I'm not sure if this is strictly correct
1636 * but it saves the agony when the X server dies and the screen
1637 * remains blanked due to KD_GRAPHICS! It would be nice to do
1638 * this outside of VT_PROCESS but there is no single process
1639 * to account for and tracking tty count may be undesirable.
1643 if (old_vc_mode != vc->vc_mode) {
1644 if (vc->vc_mode == KD_TEXT)
1645 do_unblank_screen(1);
1653 * Wake anyone waiting for their VT to activate
1655 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
1660 * Performs the front-end of a vt switch
1662 void change_console(struct vc_data *new_vc)
1666 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1670 * If this vt is in process mode, then we need to handshake with
1671 * that process before switching. Essentially, we store where that
1672 * vt wants to switch to and wait for it to tell us when it's done
1673 * (via VT_RELDISP ioctl).
1675 * We also check to see if the controlling process still exists.
1676 * If it doesn't, we reset this vt to auto mode and continue.
1677 * This is a cheap way to track process control. The worst thing
1678 * that can happen is: we send a signal to a process, it dies, and
1679 * the switch gets "lost" waiting for a response; hopefully, the
1680 * user will try again, we'll detect the process is gone (unless
1681 * the user waits just the right amount of time :-) and revert the
1682 * vt to auto control.
1684 vc = vc_cons[fg_console].d;
1685 if (vc->vt_mode.mode == VT_PROCESS) {
1687 * Send the signal as privileged - kill_pid() will
1688 * tell us if the process has gone or something else
1691 * We need to set vt_newvt *before* sending the signal or we
1694 vc->vt_newvt = new_vc->vc_num;
1695 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1697 * It worked. Mark the vt to switch to and
1698 * return. The process needs to send us a
1699 * VT_RELDISP ioctl to complete the switch.
1705 * The controlling process has died, so we revert back to
1706 * normal operation. In this case, we'll also change back
1707 * to KD_TEXT mode. I'm not sure if this is strictly correct
1708 * but it saves the agony when the X server dies and the screen
1709 * remains blanked due to KD_GRAPHICS! It would be nice to do
1710 * this outside of VT_PROCESS but there is no single process
1711 * to account for and tracking tty count may be undesirable.
1716 * Fall through to normal (VT_AUTO) handling of the switch...
1721 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1723 if (vc->vc_mode == KD_GRAPHICS)
1726 complete_change_console(new_vc);
1729 /* Perform a kernel triggered VT switch for suspend/resume */
1731 static int disable_vt_switch;
1733 int vt_move_to_console(unsigned int vt, int alloc)
1737 acquire_console_sem();
1738 /* Graphics mode - up to X */
1739 if (disable_vt_switch) {
1740 release_console_sem();
1745 if (alloc && vc_allocate(vt)) {
1746 /* we can't have a free VC for now. Too bad,
1747 * we don't want to mess the screen for now. */
1748 release_console_sem();
1752 if (set_console(vt)) {
1754 * We're unable to switch to the SUSPEND_CONSOLE.
1755 * Let the calling function know so it can decide
1758 release_console_sem();
1761 release_console_sem();
1762 if (vt_waitactive(vt + 1)) {
1763 pr_debug("Suspend: Can't switch VCs.");
1770 * Normally during a suspend, we allocate a new console and switch to it.
1771 * When we resume, we switch back to the original console. This switch
1772 * can be slow, so on systems where the framebuffer can handle restoration
1773 * of video registers anyways, there's little point in doing the console
1774 * switch. This function allows you to disable it by passing it '0'.
1776 void pm_set_vt_switch(int do_switch)
1778 acquire_console_sem();
1779 disable_vt_switch = !do_switch;
1780 release_console_sem();
1782 EXPORT_SYMBOL(pm_set_vt_switch);