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/timex.h>
33 #include <asm/uaccess.h>
35 #include <linux/kbd_kern.h>
36 #include <linux/vt_kern.h>
37 #include <linux/kbd_diacr.h>
38 #include <linux/selection.h>
41 extern struct tty_driver *console_driver;
43 #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
44 #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons)
47 * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
48 * experimentation and study of X386 SYSV handling.
50 * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
51 * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
52 * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
53 * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
54 * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
55 * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
56 * to the current console is done by the main ioctl code.
60 #include <linux/syscalls.h>
63 static void complete_change_console(struct vc_data *vc);
66 * User space VT_EVENT handlers
69 struct vt_event_wait {
70 struct list_head list;
71 struct vt_event event;
75 static LIST_HEAD(vt_events);
76 static DEFINE_SPINLOCK(vt_event_lock);
77 static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
81 * @event: the event that occurred
85 * Post an VT event to interested VT handlers
88 void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
90 struct list_head *pos, *head;
94 spin_lock_irqsave(&vt_event_lock, flags);
97 list_for_each(pos, head) {
98 struct vt_event_wait *ve = list_entry(pos,
99 struct vt_event_wait, list);
100 if (!(ve->event.event & event))
102 ve->event.event = event;
103 /* kernel view is consoles 0..n-1, user space view is
104 console 1..n with 0 meaning current, so we must bias */
105 ve->event.oldev = old + 1;
106 ve->event.newev = new + 1;
110 spin_unlock_irqrestore(&vt_event_lock, flags);
112 wake_up_interruptible(&vt_event_waitqueue);
116 * vt_event_wait - wait for an event
119 * Waits for an event to occur which completes our vt_event_wait
120 * structure. On return the structure has wv->done set to 1 for success
121 * or 0 if some event such as a signal ended the wait.
124 static void vt_event_wait(struct vt_event_wait *vw)
127 /* Prepare the event */
128 INIT_LIST_HEAD(&vw->list);
130 /* Queue our event */
131 spin_lock_irqsave(&vt_event_lock, flags);
132 list_add(&vw->list, &vt_events);
133 spin_unlock_irqrestore(&vt_event_lock, flags);
134 /* Wait for it to pass */
135 wait_event_interruptible_tty(vt_event_waitqueue, vw->done);
137 spin_lock_irqsave(&vt_event_lock, flags);
139 spin_unlock_irqrestore(&vt_event_lock, flags);
143 * vt_event_wait_ioctl - event ioctl handler
144 * @arg: argument to ioctl
146 * Implement the VT_WAITEVENT ioctl using the VT event interface
149 static int vt_event_wait_ioctl(struct vt_event __user *event)
151 struct vt_event_wait vw;
153 if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
155 /* Highest supported event for now */
156 if (vw.event.event & ~VT_MAX_EVENT)
160 /* If it occurred report it */
162 if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
170 * vt_waitactive - active console wait
174 * Helper for event waits. Used to implement the legacy
175 * event waiting ioctls in terms of events
178 int vt_waitactive(int n)
180 struct vt_event_wait vw;
182 if (n == fg_console + 1)
184 vw.event.event = VT_EVENT_SWITCH;
188 } while (vw.event.newev != n);
193 * these are the valid i/o ports we're allowed to change. they map all the
196 #define GPFIRST 0x3b4
198 #define GPNUM (GPLAST - GPFIRST + 1)
200 #define i (tmp.kb_index)
201 #define s (tmp.kb_table)
202 #define v (tmp.kb_value)
204 do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd)
207 ushort *key_map, val, ov;
209 if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
212 if (!capable(CAP_SYS_TTY_CONFIG))
217 key_map = key_maps[s];
220 if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
223 val = (i ? K_HOLE : K_NOSUCHMAP);
224 return put_user(val, &user_kbe->kb_value);
228 if (!i && v == K_NOSUCHMAP) {
230 key_map = key_maps[s];
233 if (key_map[0] == U(K_ALLOCATED)) {
241 if (KTYP(v) < NR_TYPES) {
242 if (KVAL(v) > max_vals[KTYP(v)])
245 if (kbd->kbdmode != VC_UNICODE)
248 /* ++Geert: non-PC keyboards may generate keycode zero */
249 #if !defined(__mc68000__) && !defined(__powerpc__)
250 /* assignment to entry 0 only tests validity of args */
255 if (!(key_map = key_maps[s])) {
258 if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
259 !capable(CAP_SYS_RESOURCE))
262 key_map = kmalloc(sizeof(plain_map),
266 key_maps[s] = key_map;
267 key_map[0] = U(K_ALLOCATED);
268 for (j = 1; j < NR_KEYS; j++)
269 key_map[j] = U(K_HOLE);
274 break; /* nothing to do */
278 if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN))
281 if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT))
282 compute_shiftstate();
292 do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm)
294 struct kbkeycode tmp;
297 if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
301 kc = getkeycode(tmp.scancode);
303 kc = put_user(kc, &user_kbkc->keycode);
308 kc = setkeycode(tmp.scancode, tmp.keycode);
315 do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
317 struct kbsentry *kbs;
323 char *first_free, *fj, *fnw;
327 if (!capable(CAP_SYS_TTY_CONFIG))
330 kbs = kmalloc(sizeof(*kbs), GFP_KERNEL);
336 /* we mostly copy too much here (512bytes), but who cares ;) */
337 if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) {
341 kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0';
346 sz = sizeof(kbs->kb_string) - 1; /* sz should have been
348 up = user_kdgkb->kb_string;
351 for ( ; *p && sz; p++, sz--)
352 if (put_user(*p, up++)) {
356 if (put_user('\0', up)) {
361 return ((p && *p) ? -EOVERFLOW : 0);
369 first_free = funcbufptr + (funcbufsize - funcbufleft);
370 for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++)
377 delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string);
378 if (delta <= funcbufleft) { /* it fits in current buf */
379 if (j < MAX_NR_FUNC) {
380 memmove(fj + delta, fj, first_free - fj);
381 for (k = j; k < MAX_NR_FUNC; k++)
383 func_table[k] += delta;
387 funcbufleft -= delta;
388 } else { /* allocate a larger buffer */
390 while (sz < funcbufsize - funcbufleft + delta)
392 fnw = kmalloc(sz, GFP_KERNEL);
401 memmove(fnw, funcbufptr, fj - funcbufptr);
402 for (k = 0; k < j; k++)
404 func_table[k] = fnw + (func_table[k] - funcbufptr);
406 if (first_free > fj) {
407 memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
408 for (k = j; k < MAX_NR_FUNC; k++)
410 func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
412 if (funcbufptr != func_buf)
415 funcbufleft = funcbufleft - delta + sz - funcbufsize;
418 strcpy(func_table[i], kbs->kb_string);
428 do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
430 struct consolefontdesc cfdarg;
433 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
440 op->op = KD_FONT_OP_SET;
441 op->flags = KD_FONT_FLAG_OLD;
443 op->height = cfdarg.charheight;
444 op->charcount = cfdarg.charcount;
445 op->data = cfdarg.chardata;
446 return con_font_op(vc_cons[fg_console].d, op);
448 op->op = KD_FONT_OP_GET;
449 op->flags = KD_FONT_FLAG_OLD;
451 op->height = cfdarg.charheight;
452 op->charcount = cfdarg.charcount;
453 op->data = cfdarg.chardata;
454 i = con_font_op(vc_cons[fg_console].d, op);
457 cfdarg.charheight = op->height;
458 cfdarg.charcount = op->charcount;
459 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
468 do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
470 struct unimapdesc tmp;
472 if (copy_from_user(&tmp, user_ud, sizeof tmp))
475 if (!access_ok(VERIFY_WRITE, tmp.entries,
476 tmp.entry_ct*sizeof(struct unipair)))
482 return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
484 if (!perm && fg_console != vc->vc_num)
486 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
494 * We handle the console-specific ioctl's here. We allow the
495 * capability to modify any console, not just the fg_console.
497 int vt_ioctl(struct tty_struct *tty,
498 unsigned int cmd, unsigned long arg)
500 struct vc_data *vc = tty->driver_data;
501 struct console_font_op op; /* used in multiple places here */
502 struct kbd_struct * kbd;
503 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);
537 * The use of PIT_TICK_RATE is historic, it used to be
538 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
539 * and 2.6.36, which was a minor but unfortunate ABI
543 arg = PIT_TICK_RATE / arg;
551 unsigned int ticks, count;
554 * Generate the tone for the appropriate number of ticks.
555 * If the time is zero, turn off sound ourselves.
557 ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
558 count = ticks ? (arg & 0xffff) : 0;
560 count = PIT_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
653 do_unblank_screen(1);
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();
691 kbd->kbdmode = VC_OFF;
697 tty_ldisc_flush(tty);
701 uival = ((kbd->kbdmode == VC_RAW) ? K_RAW :
702 (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW :
703 (kbd->kbdmode == VC_UNICODE) ? K_UNICODE :
707 /* this could be folded into KDSKBMODE, but for compatibility
708 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
712 clr_vc_kbd_mode(kbd, VC_META);
715 set_vc_kbd_mode(kbd, VC_META);
723 uival = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
725 ret = put_user(uival, (int __user *)arg);
730 if(!capable(CAP_SYS_TTY_CONFIG))
732 ret = do_kbkeycode_ioctl(cmd, up, perm);
737 ret = do_kdsk_ioctl(cmd, up, perm, kbd);
742 ret = do_kdgkb_ioctl(cmd, up, perm);
747 struct kbdiacrs __user *a = up;
748 struct kbdiacr diacr;
751 if (put_user(accent_table_size, &a->kb_cnt)) {
755 for (i = 0; i < accent_table_size; i++) {
756 diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr);
757 diacr.base = conv_uni_to_8bit(accent_table[i].base);
758 diacr.result = conv_uni_to_8bit(accent_table[i].result);
759 if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) {
768 struct kbdiacrsuc __user *a = up;
770 if (put_user(accent_table_size, &a->kb_cnt))
772 else if (copy_to_user(a->kbdiacruc, accent_table,
773 accent_table_size*sizeof(struct kbdiacruc)))
780 struct kbdiacrs __user *a = up;
781 struct kbdiacr diacr;
787 if (get_user(ct,&a->kb_cnt)) {
791 if (ct >= MAX_DIACR) {
795 accent_table_size = ct;
796 for (i = 0; i < ct; i++) {
797 if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) {
801 accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr);
802 accent_table[i].base = conv_8bit_to_uni(diacr.base);
803 accent_table[i].result = conv_8bit_to_uni(diacr.result);
810 struct kbdiacrsuc __user *a = up;
815 if (get_user(ct,&a->kb_cnt)) {
819 if (ct >= MAX_DIACR) {
823 accent_table_size = ct;
824 if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc)))
829 /* the ioctls below read/set the flags usually shown in the leds */
830 /* don't use them - they will go away without warning */
832 ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
842 kbd->ledflagstate = (arg & 7);
843 kbd->default_ledflagstate = ((arg >> 4) & 7);
847 /* the ioctls below only set the lights, not the functions */
848 /* for those, see KDGKBLED and KDSKBLED above */
850 ucval = getledstate();
852 ret = put_user(ucval, (char __user *)arg);
858 setledstate(kbd, arg);
862 * A process can indicate its willingness to accept signals
863 * generated by pressing an appropriate key combination.
864 * Thus, one can have a daemon that e.g. spawns a new console
865 * upon a keypress and then changes to it.
866 * See also the kbrequest field of inittab(5).
870 if (!perm || !capable(CAP_KILL))
872 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
875 spin_lock_irq(&vt_spawn_con.lock);
876 put_pid(vt_spawn_con.pid);
877 vt_spawn_con.pid = get_pid(task_pid(current));
878 vt_spawn_con.sig = arg;
879 spin_unlock_irq(&vt_spawn_con.lock);
890 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
894 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
900 /* the frsig is ignored, so we set it to 0 */
901 vc->vt_mode.frsig = 0;
903 vc->vt_pid = get_pid(task_pid(current));
904 /* no switch is required -- saw@shade.msu.ru */
916 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
919 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
926 * Returns global vt state. Note that VT 0 is always open, since
927 * it's an alias for the current VT, and people can't use it here.
928 * We cannot return state for more than 16 VTs, since v_state is short.
932 struct vt_stat __user *vtstat = up;
933 unsigned short state, mask;
935 if (put_user(fg_console + 1, &vtstat->v_active))
938 state = 1; /* /dev/tty0 is always open */
939 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
943 ret = put_user(state, &vtstat->v_state);
949 * Returns the first available (non-opened) console.
952 for (i = 0; i < MAX_NR_CONSOLES; ++i)
953 if (! VT_IS_IN_USE(i))
955 uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
959 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
960 * with num >= 1 (switches to vt 0, our console, are not allowed, just
961 * to preserve sanity).
966 if (arg == 0 || arg > MAX_NR_CONSOLES)
971 ret = vc_allocate(arg);
981 struct vt_setactivate vsa;
986 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
987 sizeof(struct vt_setactivate))) {
991 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
996 ret = vc_allocate(vsa.console);
999 /* This is safe providing we don't drop the
1000 console sem between vc_allocate and
1001 finishing referencing nvc */
1002 nvc = vc_cons[vsa.console].d;
1003 nvc->vt_mode = vsa.mode;
1004 nvc->vt_mode.frsig = 0;
1005 put_pid(nvc->vt_pid);
1006 nvc->vt_pid = get_pid(task_pid(current));
1011 /* Commence switch and lock */
1012 set_console(vsa.console);
1018 * wait until the specified VT has been activated
1023 if (arg == 0 || arg > MAX_NR_CONSOLES)
1026 ret = vt_waitactive(arg);
1030 * If a vt is under process control, the kernel will not switch to it
1031 * immediately, but postpone the operation until the process calls this
1032 * ioctl, allowing the switch to complete.
1034 * According to the X sources this is the behavior:
1035 * 0: pending switch-from not OK
1036 * 1: pending switch-from OK
1037 * 2: completed switch-to OK
1043 if (vc->vt_mode.mode != VT_PROCESS) {
1048 * Switching-from response
1051 if (vc->vt_newvt >= 0) {
1054 * Switch disallowed, so forget we were trying
1061 * The current vt has been released, so
1062 * complete the switch.
1065 newvt = vc->vt_newvt;
1067 ret = vc_allocate(newvt);
1073 * When we actually do the console switch,
1074 * make sure we are atomic with respect to
1075 * other console switches..
1077 complete_change_console(vc_cons[newvt].d);
1081 * Switched-to response
1084 * If it's just an ACK, ignore it
1086 if (arg != VT_ACKACQ)
1093 * Disallocate memory associated to VT (but leave VT1)
1095 case VT_DISALLOCATE:
1096 if (arg > MAX_NR_CONSOLES) {
1101 /* deallocate all unused consoles, but leave 0 */
1103 for (i=1; i<MAX_NR_CONSOLES; i++)
1108 /* deallocate a single console, if possible */
1112 else if (arg) { /* leave 0 */
1122 struct vt_sizes __user *vtsizes = up;
1128 if (get_user(ll, &vtsizes->v_rows) ||
1129 get_user(cc, &vtsizes->v_cols))
1133 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1137 vc->vc_resize_user = 1;
1138 vc_resize(vc_cons[i].d, cc, ll);
1148 struct vt_consize __user *vtconsize = up;
1149 ushort ll,cc,vlin,clin,vcol,ccol;
1152 if (!access_ok(VERIFY_READ, vtconsize,
1153 sizeof(struct vt_consize))) {
1157 /* FIXME: Should check the copies properly */
1158 __get_user(ll, &vtconsize->v_rows);
1159 __get_user(cc, &vtconsize->v_cols);
1160 __get_user(vlin, &vtconsize->v_vlin);
1161 __get_user(clin, &vtconsize->v_clin);
1162 __get_user(vcol, &vtconsize->v_vcol);
1163 __get_user(ccol, &vtconsize->v_ccol);
1164 vlin = vlin ? vlin : vc->vc_scan_lines;
1167 if (ll != vlin/clin) {
1168 /* Parameters don't add up */
1177 if (cc != vcol/ccol) {
1190 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1195 vc_cons[i].d->vc_scan_lines = vlin;
1197 vc_cons[i].d->vc_font.height = clin;
1198 vc_cons[i].d->vc_resize_user = 1;
1199 vc_resize(vc_cons[i].d, cc, ll);
1208 op.op = KD_FONT_OP_SET;
1209 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
1214 ret = con_font_op(vc_cons[fg_console].d, &op);
1219 op.op = KD_FONT_OP_GET;
1220 op.flags = KD_FONT_FLAG_OLD;
1225 ret = con_font_op(vc_cons[fg_console].d, &op);
1233 ret = con_set_cmap(up);
1237 ret = con_get_cmap(up);
1242 ret = do_fontx_ioctl(cmd, up, perm, &op);
1250 #ifdef BROKEN_GRAPHICS_PROGRAMS
1251 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
1252 font is not saved. */
1257 op.op = KD_FONT_OP_SET_DEFAULT;
1259 ret = con_font_op(vc_cons[fg_console].d, &op);
1262 con_set_default_unimap(vc_cons[fg_console].d);
1269 if (copy_from_user(&op, up, sizeof(op))) {
1273 if (!perm && op.op != KD_FONT_OP_GET)
1275 ret = con_font_op(vc, &op);
1278 if (copy_to_user(up, &op, sizeof(op)))
1287 ret = con_set_trans_old(up);
1291 ret = con_get_trans_old(up);
1294 case PIO_UNISCRNMAP:
1298 ret = con_set_trans_new(up);
1301 case GIO_UNISCRNMAP:
1302 ret = con_get_trans_new(up);
1306 { struct unimapinit ui;
1309 ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
1313 con_clear_unimap(vc, &ui);
1319 ret = do_unimap_ioctl(cmd, up, perm, vc);
1323 if (!capable(CAP_SYS_TTY_CONFIG))
1327 case VT_UNLOCKSWITCH:
1328 if (!capable(CAP_SYS_TTY_CONFIG))
1332 case VT_GETHIFONTMASK:
1333 ret = put_user(vc->vc_hi_font_mask,
1334 (unsigned short __user *)arg);
1337 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1350 void reset_vc(struct vc_data *vc)
1352 vc->vc_mode = KD_TEXT;
1353 kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
1354 vc->vt_mode.mode = VT_AUTO;
1355 vc->vt_mode.waitv = 0;
1356 vc->vt_mode.relsig = 0;
1357 vc->vt_mode.acqsig = 0;
1358 vc->vt_mode.frsig = 0;
1359 put_pid(vc->vt_pid);
1362 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1366 void vc_SAK(struct work_struct *work)
1369 container_of(work, struct vc, SAK_work);
1371 struct tty_struct *tty;
1378 * SAK should also work in all raw modes and reset
1388 #ifdef CONFIG_COMPAT
1390 struct compat_consolefontdesc {
1391 unsigned short charcount; /* characters in font (256 or 512) */
1392 unsigned short charheight; /* scan lines per character (1-32) */
1393 compat_caddr_t chardata; /* font data in expanded form */
1397 compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1398 int perm, struct console_font_op *op)
1400 struct compat_consolefontdesc cfdarg;
1403 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1410 op->op = KD_FONT_OP_SET;
1411 op->flags = KD_FONT_FLAG_OLD;
1413 op->height = cfdarg.charheight;
1414 op->charcount = cfdarg.charcount;
1415 op->data = compat_ptr(cfdarg.chardata);
1416 return con_font_op(vc_cons[fg_console].d, op);
1418 op->op = KD_FONT_OP_GET;
1419 op->flags = KD_FONT_FLAG_OLD;
1421 op->height = cfdarg.charheight;
1422 op->charcount = cfdarg.charcount;
1423 op->data = compat_ptr(cfdarg.chardata);
1424 i = con_font_op(vc_cons[fg_console].d, op);
1427 cfdarg.charheight = op->height;
1428 cfdarg.charcount = op->charcount;
1429 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1436 struct compat_console_font_op {
1437 compat_uint_t op; /* operation code KD_FONT_OP_* */
1438 compat_uint_t flags; /* KD_FONT_FLAG_* */
1439 compat_uint_t width, height; /* font size */
1440 compat_uint_t charcount;
1441 compat_caddr_t data; /* font data with height fixed to 32 */
1445 compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1446 int perm, struct console_font_op *op, struct vc_data *vc)
1450 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1452 if (!perm && op->op != KD_FONT_OP_GET)
1454 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
1455 op->flags |= KD_FONT_FLAG_OLD;
1456 i = con_font_op(vc, op);
1459 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1460 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1465 struct compat_unimapdesc {
1466 unsigned short entry_ct;
1467 compat_caddr_t entries;
1471 compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1472 int perm, struct vc_data *vc)
1474 struct compat_unimapdesc tmp;
1475 struct unipair __user *tmp_entries;
1477 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1479 tmp_entries = compat_ptr(tmp.entries);
1481 if (!access_ok(VERIFY_WRITE, tmp_entries,
1482 tmp.entry_ct*sizeof(struct unipair)))
1488 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1490 if (!perm && fg_console != vc->vc_num)
1492 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1497 long vt_compat_ioctl(struct tty_struct *tty,
1498 unsigned int cmd, unsigned long arg)
1500 struct vc_data *vc = tty->driver_data;
1501 struct console_font_op op; /* used in multiple places here */
1502 struct kbd_struct *kbd;
1503 unsigned int console;
1504 void __user *up = (void __user *)arg;
1508 console = vc->vc_num;
1512 if (!vc_cons_allocated(console)) { /* impossible? */
1518 * To have permissions to do most of the vt ioctls, we either have
1519 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1522 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1525 kbd = kbd_table + console;
1528 * these need special handlers for incompatible data structures
1532 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1536 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1541 ret = compat_unimap_ioctl(cmd, up, perm, vc);
1545 * all these treat 'arg' as an integer
1564 case VT_DISALLOCATE:
1570 * the rest has a compatible data structure behind arg,
1571 * but we have to convert it to a proper 64 bit pointer.
1574 arg = (unsigned long)compat_ptr(arg);
1583 return vt_ioctl(tty, cmd, arg);
1587 #endif /* CONFIG_COMPAT */
1591 * Performs the back end of a vt switch. Called under the console
1594 static void complete_change_console(struct vc_data *vc)
1596 unsigned char old_vc_mode;
1597 int old = fg_console;
1599 last_console = fg_console;
1602 * If we're switching, we could be going from KD_GRAPHICS to
1603 * KD_TEXT mode or vice versa, which means we need to blank or
1604 * unblank the screen later.
1606 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1610 * This can't appear below a successful kill_pid(). If it did,
1611 * then the *blank_screen operation could occur while X, having
1612 * received acqsig, is waking up on another processor. This
1613 * condition can lead to overlapping accesses to the VGA range
1614 * and the framebuffer (causing system lockups).
1616 * To account for this we duplicate this code below only if the
1617 * controlling process is gone and we've called reset_vc.
1619 if (old_vc_mode != vc->vc_mode) {
1620 if (vc->vc_mode == KD_TEXT)
1621 do_unblank_screen(1);
1627 * If this new console is under process control, send it a signal
1628 * telling it that it has acquired. Also check if it has died and
1629 * clean up (similar to logic employed in change_console())
1631 if (vc->vt_mode.mode == VT_PROCESS) {
1633 * Send the signal as privileged - kill_pid() will
1634 * tell us if the process has gone or something else
1637 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1639 * The controlling process has died, so we revert back to
1640 * normal operation. In this case, we'll also change back
1641 * to KD_TEXT mode. I'm not sure if this is strictly correct
1642 * but it saves the agony when the X server dies and the screen
1643 * remains blanked due to KD_GRAPHICS! It would be nice to do
1644 * this outside of VT_PROCESS but there is no single process
1645 * to account for and tracking tty count may be undesirable.
1649 if (old_vc_mode != vc->vc_mode) {
1650 if (vc->vc_mode == KD_TEXT)
1651 do_unblank_screen(1);
1659 * Wake anyone waiting for their VT to activate
1661 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
1666 * Performs the front-end of a vt switch
1668 void change_console(struct vc_data *new_vc)
1672 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1676 * If this vt is in process mode, then we need to handshake with
1677 * that process before switching. Essentially, we store where that
1678 * vt wants to switch to and wait for it to tell us when it's done
1679 * (via VT_RELDISP ioctl).
1681 * We also check to see if the controlling process still exists.
1682 * If it doesn't, we reset this vt to auto mode and continue.
1683 * This is a cheap way to track process control. The worst thing
1684 * that can happen is: we send a signal to a process, it dies, and
1685 * the switch gets "lost" waiting for a response; hopefully, the
1686 * user will try again, we'll detect the process is gone (unless
1687 * the user waits just the right amount of time :-) and revert the
1688 * vt to auto control.
1690 vc = vc_cons[fg_console].d;
1691 if (vc->vt_mode.mode == VT_PROCESS) {
1693 * Send the signal as privileged - kill_pid() will
1694 * tell us if the process has gone or something else
1697 * We need to set vt_newvt *before* sending the signal or we
1700 vc->vt_newvt = new_vc->vc_num;
1701 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1703 * It worked. Mark the vt to switch to and
1704 * return. The process needs to send us a
1705 * VT_RELDISP ioctl to complete the switch.
1711 * The controlling process has died, so we revert back to
1712 * normal operation. In this case, we'll also change back
1713 * to KD_TEXT mode. I'm not sure if this is strictly correct
1714 * but it saves the agony when the X server dies and the screen
1715 * remains blanked due to KD_GRAPHICS! It would be nice to do
1716 * this outside of VT_PROCESS but there is no single process
1717 * to account for and tracking tty count may be undesirable.
1722 * Fall through to normal (VT_AUTO) handling of the switch...
1727 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1729 if (vc->vc_mode == KD_GRAPHICS)
1732 complete_change_console(new_vc);
1735 /* Perform a kernel triggered VT switch for suspend/resume */
1737 static int disable_vt_switch;
1739 int vt_move_to_console(unsigned int vt, int alloc)
1744 /* Graphics mode - up to X */
1745 if (disable_vt_switch) {
1751 if (alloc && vc_allocate(vt)) {
1752 /* we can't have a free VC for now. Too bad,
1753 * we don't want to mess the screen for now. */
1758 if (set_console(vt)) {
1760 * We're unable to switch to the SUSPEND_CONSOLE.
1761 * Let the calling function know so it can decide
1769 if (vt_waitactive(vt + 1)) {
1770 pr_debug("Suspend: Can't switch VCs.");
1779 * Normally during a suspend, we allocate a new console and switch to it.
1780 * When we resume, we switch back to the original console. This switch
1781 * can be slow, so on systems where the framebuffer can handle restoration
1782 * of video registers anyways, there's little point in doing the console
1783 * switch. This function allows you to disable it by passing it '0'.
1785 void pm_set_vt_switch(int do_switch)
1788 disable_vt_switch = !do_switch;
1791 EXPORT_SYMBOL(pm_set_vt_switch);