2 * Copyright (C) 1992 obz under the linux copyright
4 * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
5 * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
6 * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
7 * Some code moved for less code duplication - Andi Kleen - Mar 1997
8 * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001
11 #include <linux/types.h>
12 #include <linux/errno.h>
13 #include <linux/sched.h>
14 #include <linux/tty.h>
15 #include <linux/timer.h>
16 #include <linux/kernel.h>
17 #include <linux/compat.h>
18 #include <linux/module.h>
21 #include <linux/string.h>
22 #include <linux/slab.h>
23 #include <linux/major.h>
25 #include <linux/console.h>
26 #include <linux/consolemap.h>
27 #include <linux/signal.h>
28 #include <linux/timex.h>
31 #include <asm/uaccess.h>
33 #include <linux/kbd_kern.h>
34 #include <linux/vt_kern.h>
35 #include <linux/kbd_diacr.h>
36 #include <linux/selection.h>
39 extern struct tty_driver *console_driver;
41 #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
42 #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons)
45 * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
46 * experimentation and study of X386 SYSV handling.
48 * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
49 * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
50 * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
51 * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
52 * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
53 * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
54 * to the current console is done by the main ioctl code.
58 #include <linux/syscalls.h>
61 static void complete_change_console(struct vc_data *vc);
64 * User space VT_EVENT handlers
67 struct vt_event_wait {
68 struct list_head list;
69 struct vt_event event;
73 static LIST_HEAD(vt_events);
74 static DEFINE_SPINLOCK(vt_event_lock);
75 static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
79 * @event: the event that occurred
83 * Post an VT event to interested VT handlers
86 void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
88 struct list_head *pos, *head;
92 spin_lock_irqsave(&vt_event_lock, flags);
95 list_for_each(pos, head) {
96 struct vt_event_wait *ve = list_entry(pos,
97 struct vt_event_wait, list);
98 if (!(ve->event.event & event))
100 ve->event.event = event;
101 /* kernel view is consoles 0..n-1, user space view is
102 console 1..n with 0 meaning current, so we must bias */
103 ve->event.oldev = old + 1;
104 ve->event.newev = new + 1;
108 spin_unlock_irqrestore(&vt_event_lock, flags);
110 wake_up_interruptible(&vt_event_waitqueue);
114 * vt_event_wait - wait for an event
117 * Waits for an event to occur which completes our vt_event_wait
118 * structure. On return the structure has wv->done set to 1 for success
119 * or 0 if some event such as a signal ended the wait.
122 static void vt_event_wait(struct vt_event_wait *vw)
125 /* Prepare the event */
126 INIT_LIST_HEAD(&vw->list);
128 /* Queue our event */
129 spin_lock_irqsave(&vt_event_lock, flags);
130 list_add(&vw->list, &vt_events);
131 spin_unlock_irqrestore(&vt_event_lock, flags);
132 /* Wait for it to pass */
133 wait_event_interruptible_tty(vt_event_waitqueue, vw->done);
135 spin_lock_irqsave(&vt_event_lock, flags);
137 spin_unlock_irqrestore(&vt_event_lock, flags);
141 * vt_event_wait_ioctl - event ioctl handler
142 * @arg: argument to ioctl
144 * Implement the VT_WAITEVENT ioctl using the VT event interface
147 static int vt_event_wait_ioctl(struct vt_event __user *event)
149 struct vt_event_wait vw;
151 if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
153 /* Highest supported event for now */
154 if (vw.event.event & ~VT_MAX_EVENT)
158 /* If it occurred report it */
160 if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
168 * vt_waitactive - active console wait
172 * Helper for event waits. Used to implement the legacy
173 * event waiting ioctls in terms of events
176 int vt_waitactive(int n)
178 struct vt_event_wait vw;
180 if (n == fg_console + 1)
182 vw.event.event = VT_EVENT_SWITCH;
186 } while (vw.event.newev != n);
191 * these are the valid i/o ports we're allowed to change. they map all the
194 #define GPFIRST 0x3b4
196 #define GPNUM (GPLAST - GPFIRST + 1)
198 #define i (tmp.kb_index)
199 #define s (tmp.kb_table)
200 #define v (tmp.kb_value)
202 do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd)
205 ushort *key_map, val, ov;
207 if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
210 if (!capable(CAP_SYS_TTY_CONFIG))
215 key_map = key_maps[s];
218 if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
221 val = (i ? K_HOLE : K_NOSUCHMAP);
222 return put_user(val, &user_kbe->kb_value);
226 if (!i && v == K_NOSUCHMAP) {
228 key_map = key_maps[s];
231 if (key_map[0] == U(K_ALLOCATED)) {
239 if (KTYP(v) < NR_TYPES) {
240 if (KVAL(v) > max_vals[KTYP(v)])
243 if (kbd->kbdmode != VC_UNICODE)
246 /* ++Geert: non-PC keyboards may generate keycode zero */
247 #if !defined(__mc68000__) && !defined(__powerpc__)
248 /* assignment to entry 0 only tests validity of args */
253 if (!(key_map = key_maps[s])) {
256 if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
257 !capable(CAP_SYS_RESOURCE))
260 key_map = kmalloc(sizeof(plain_map),
264 key_maps[s] = key_map;
265 key_map[0] = U(K_ALLOCATED);
266 for (j = 1; j < NR_KEYS; j++)
267 key_map[j] = U(K_HOLE);
272 break; /* nothing to do */
276 if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN))
279 if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT))
280 compute_shiftstate();
290 do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm)
292 struct kbkeycode tmp;
295 if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
299 kc = getkeycode(tmp.scancode);
301 kc = put_user(kc, &user_kbkc->keycode);
306 kc = setkeycode(tmp.scancode, tmp.keycode);
313 do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
315 struct kbsentry *kbs;
321 char *first_free, *fj, *fnw;
325 if (!capable(CAP_SYS_TTY_CONFIG))
328 kbs = kmalloc(sizeof(*kbs), GFP_KERNEL);
334 /* we mostly copy too much here (512bytes), but who cares ;) */
335 if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) {
339 kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0';
344 sz = sizeof(kbs->kb_string) - 1; /* sz should have been
346 up = user_kdgkb->kb_string;
349 for ( ; *p && sz; p++, sz--)
350 if (put_user(*p, up++)) {
354 if (put_user('\0', up)) {
359 return ((p && *p) ? -EOVERFLOW : 0);
367 first_free = funcbufptr + (funcbufsize - funcbufleft);
368 for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++)
375 delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string);
376 if (delta <= funcbufleft) { /* it fits in current buf */
377 if (j < MAX_NR_FUNC) {
378 memmove(fj + delta, fj, first_free - fj);
379 for (k = j; k < MAX_NR_FUNC; k++)
381 func_table[k] += delta;
385 funcbufleft -= delta;
386 } else { /* allocate a larger buffer */
388 while (sz < funcbufsize - funcbufleft + delta)
390 fnw = kmalloc(sz, GFP_KERNEL);
399 memmove(fnw, funcbufptr, fj - funcbufptr);
400 for (k = 0; k < j; k++)
402 func_table[k] = fnw + (func_table[k] - funcbufptr);
404 if (first_free > fj) {
405 memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
406 for (k = j; k < MAX_NR_FUNC; k++)
408 func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
410 if (funcbufptr != func_buf)
413 funcbufleft = funcbufleft - delta + sz - funcbufsize;
416 strcpy(func_table[i], kbs->kb_string);
426 do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
428 struct consolefontdesc cfdarg;
431 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
438 op->op = KD_FONT_OP_SET;
439 op->flags = KD_FONT_FLAG_OLD;
441 op->height = cfdarg.charheight;
442 op->charcount = cfdarg.charcount;
443 op->data = cfdarg.chardata;
444 return con_font_op(vc_cons[fg_console].d, op);
446 op->op = KD_FONT_OP_GET;
447 op->flags = KD_FONT_FLAG_OLD;
449 op->height = cfdarg.charheight;
450 op->charcount = cfdarg.charcount;
451 op->data = cfdarg.chardata;
452 i = con_font_op(vc_cons[fg_console].d, op);
455 cfdarg.charheight = op->height;
456 cfdarg.charcount = op->charcount;
457 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
466 do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
468 struct unimapdesc tmp;
470 if (copy_from_user(&tmp, user_ud, sizeof tmp))
473 if (!access_ok(VERIFY_WRITE, tmp.entries,
474 tmp.entry_ct*sizeof(struct unipair)))
480 return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
482 if (!perm && fg_console != vc->vc_num)
484 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
492 * We handle the console-specific ioctl's here. We allow the
493 * capability to modify any console, not just the fg_console.
495 int vt_ioctl(struct tty_struct *tty,
496 unsigned int cmd, unsigned long arg)
498 struct vc_data *vc = tty->driver_data;
499 struct console_font_op op; /* used in multiple places here */
500 struct kbd_struct * kbd;
501 unsigned int console;
504 void __user *up = (void __user *)arg;
508 console = vc->vc_num;
512 if (!vc_cons_allocated(console)) { /* impossible? */
519 * To have permissions to do most of the vt ioctls, we either have
520 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
523 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
526 kbd = kbd_table + console;
529 ret = tioclinux(tty, arg);
535 * The use of PIT_TICK_RATE is historic, it used to be
536 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
537 * and 2.6.36, which was a minor but unfortunate ABI
541 arg = PIT_TICK_RATE / arg;
549 unsigned int ticks, count;
552 * Generate the tone for the appropriate number of ticks.
553 * If the time is zero, turn off sound ourselves.
555 ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
556 count = ticks ? (arg & 0xffff) : 0;
558 count = PIT_TICK_RATE / count;
559 kd_mksound(count, ticks);
571 * These cannot be implemented on any machine that implements
572 * ioperm() in user level (such as Alpha PCs) or not at all.
574 * XXX: you should never use these, just call ioperm directly..
580 * KDADDIO and KDDELIO may be able to add ports beyond what
581 * we reject here, but to be safe...
583 if (arg < GPFIRST || arg > GPLAST) {
587 ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
592 ret = sys_ioperm(GPFIRST, GPNUM,
593 (cmd == KDENABIO)) ? -ENXIO : 0;
597 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
601 struct kbd_repeat kbrep;
603 if (!capable(CAP_SYS_TTY_CONFIG))
606 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
610 ret = kbd_rate(&kbrep);
613 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
620 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
621 * doesn't do a whole lot. i'm not sure if it should do any
622 * restoration of modes or what...
624 * XXX It should at least call into the driver, fbdev's definitely
625 * need to restore their engine state. --BenH
641 if (vc->vc_mode == (unsigned char) arg)
643 vc->vc_mode = (unsigned char) arg;
644 if (console != fg_console)
647 * explicitly blank/unblank the screen if switching modes
651 do_unblank_screen(1);
664 * these work like a combination of mmap and KDENABIO.
665 * this could be easily finished.
675 kbd->kbdmode = VC_RAW;
678 kbd->kbdmode = VC_MEDIUMRAW;
681 kbd->kbdmode = VC_XLATE;
682 compute_shiftstate();
685 kbd->kbdmode = VC_UNICODE;
686 compute_shiftstate();
689 kbd->kbdmode = VC_OFF;
695 tty_ldisc_flush(tty);
699 switch (kbd->kbdmode) {
718 /* this could be folded into KDSKBMODE, but for compatibility
719 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
723 clr_vc_kbd_mode(kbd, VC_META);
726 set_vc_kbd_mode(kbd, VC_META);
734 uival = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
736 ret = put_user(uival, (int __user *)arg);
741 if(!capable(CAP_SYS_TTY_CONFIG))
743 ret = do_kbkeycode_ioctl(cmd, up, perm);
748 ret = do_kdsk_ioctl(cmd, up, perm, kbd);
753 ret = do_kdgkb_ioctl(cmd, up, perm);
758 struct kbdiacrs __user *a = up;
759 struct kbdiacr diacr;
762 if (put_user(accent_table_size, &a->kb_cnt)) {
766 for (i = 0; i < accent_table_size; i++) {
767 diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr);
768 diacr.base = conv_uni_to_8bit(accent_table[i].base);
769 diacr.result = conv_uni_to_8bit(accent_table[i].result);
770 if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) {
779 struct kbdiacrsuc __user *a = up;
781 if (put_user(accent_table_size, &a->kb_cnt))
783 else if (copy_to_user(a->kbdiacruc, accent_table,
784 accent_table_size*sizeof(struct kbdiacruc)))
791 struct kbdiacrs __user *a = up;
792 struct kbdiacr diacr;
798 if (get_user(ct,&a->kb_cnt)) {
802 if (ct >= MAX_DIACR) {
806 accent_table_size = ct;
807 for (i = 0; i < ct; i++) {
808 if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) {
812 accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr);
813 accent_table[i].base = conv_8bit_to_uni(diacr.base);
814 accent_table[i].result = conv_8bit_to_uni(diacr.result);
821 struct kbdiacrsuc __user *a = up;
826 if (get_user(ct,&a->kb_cnt)) {
830 if (ct >= MAX_DIACR) {
834 accent_table_size = ct;
835 if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc)))
840 /* the ioctls below read/set the flags usually shown in the leds */
841 /* don't use them - they will go away without warning */
843 ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
853 kbd->ledflagstate = (arg & 7);
854 kbd->default_ledflagstate = ((arg >> 4) & 7);
858 /* the ioctls below only set the lights, not the functions */
859 /* for those, see KDGKBLED and KDSKBLED above */
861 ucval = getledstate();
863 ret = put_user(ucval, (char __user *)arg);
869 setledstate(kbd, arg);
873 * A process can indicate its willingness to accept signals
874 * generated by pressing an appropriate key combination.
875 * Thus, one can have a daemon that e.g. spawns a new console
876 * upon a keypress and then changes to it.
877 * See also the kbrequest field of inittab(5).
881 if (!perm || !capable(CAP_KILL))
883 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
886 spin_lock_irq(&vt_spawn_con.lock);
887 put_pid(vt_spawn_con.pid);
888 vt_spawn_con.pid = get_pid(task_pid(current));
889 vt_spawn_con.sig = arg;
890 spin_unlock_irq(&vt_spawn_con.lock);
901 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
905 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
911 /* the frsig is ignored, so we set it to 0 */
912 vc->vt_mode.frsig = 0;
914 vc->vt_pid = get_pid(task_pid(current));
915 /* no switch is required -- saw@shade.msu.ru */
927 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
930 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
937 * Returns global vt state. Note that VT 0 is always open, since
938 * it's an alias for the current VT, and people can't use it here.
939 * We cannot return state for more than 16 VTs, since v_state is short.
943 struct vt_stat __user *vtstat = up;
944 unsigned short state, mask;
946 if (put_user(fg_console + 1, &vtstat->v_active))
949 state = 1; /* /dev/tty0 is always open */
950 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
954 ret = put_user(state, &vtstat->v_state);
960 * Returns the first available (non-opened) console.
963 for (i = 0; i < MAX_NR_CONSOLES; ++i)
964 if (! VT_IS_IN_USE(i))
966 uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
970 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
971 * with num >= 1 (switches to vt 0, our console, are not allowed, just
972 * to preserve sanity).
977 if (arg == 0 || arg > MAX_NR_CONSOLES)
982 ret = vc_allocate(arg);
992 struct vt_setactivate vsa;
997 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
998 sizeof(struct vt_setactivate))) {
1002 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
1007 ret = vc_allocate(vsa.console);
1009 struct vc_data *nvc;
1010 /* This is safe providing we don't drop the
1011 console sem between vc_allocate and
1012 finishing referencing nvc */
1013 nvc = vc_cons[vsa.console].d;
1014 nvc->vt_mode = vsa.mode;
1015 nvc->vt_mode.frsig = 0;
1016 put_pid(nvc->vt_pid);
1017 nvc->vt_pid = get_pid(task_pid(current));
1022 /* Commence switch and lock */
1023 set_console(vsa.console);
1029 * wait until the specified VT has been activated
1034 if (arg == 0 || arg > MAX_NR_CONSOLES)
1037 ret = vt_waitactive(arg);
1041 * If a vt is under process control, the kernel will not switch to it
1042 * immediately, but postpone the operation until the process calls this
1043 * ioctl, allowing the switch to complete.
1045 * According to the X sources this is the behavior:
1046 * 0: pending switch-from not OK
1047 * 1: pending switch-from OK
1048 * 2: completed switch-to OK
1054 if (vc->vt_mode.mode != VT_PROCESS) {
1059 * Switching-from response
1062 if (vc->vt_newvt >= 0) {
1065 * Switch disallowed, so forget we were trying
1072 * The current vt has been released, so
1073 * complete the switch.
1076 newvt = vc->vt_newvt;
1078 ret = vc_allocate(newvt);
1084 * When we actually do the console switch,
1085 * make sure we are atomic with respect to
1086 * other console switches..
1088 complete_change_console(vc_cons[newvt].d);
1092 * Switched-to response
1095 * If it's just an ACK, ignore it
1097 if (arg != VT_ACKACQ)
1104 * Disallocate memory associated to VT (but leave VT1)
1106 case VT_DISALLOCATE:
1107 if (arg > MAX_NR_CONSOLES) {
1112 /* deallocate all unused consoles, but leave 0 */
1114 for (i=1; i<MAX_NR_CONSOLES; i++)
1119 /* deallocate a single console, if possible */
1123 else if (arg) { /* leave 0 */
1133 struct vt_sizes __user *vtsizes = up;
1139 if (get_user(ll, &vtsizes->v_rows) ||
1140 get_user(cc, &vtsizes->v_cols))
1144 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1148 vc->vc_resize_user = 1;
1149 vc_resize(vc_cons[i].d, cc, ll);
1159 struct vt_consize __user *vtconsize = up;
1160 ushort ll,cc,vlin,clin,vcol,ccol;
1163 if (!access_ok(VERIFY_READ, vtconsize,
1164 sizeof(struct vt_consize))) {
1168 /* FIXME: Should check the copies properly */
1169 __get_user(ll, &vtconsize->v_rows);
1170 __get_user(cc, &vtconsize->v_cols);
1171 __get_user(vlin, &vtconsize->v_vlin);
1172 __get_user(clin, &vtconsize->v_clin);
1173 __get_user(vcol, &vtconsize->v_vcol);
1174 __get_user(ccol, &vtconsize->v_ccol);
1175 vlin = vlin ? vlin : vc->vc_scan_lines;
1178 if (ll != vlin/clin) {
1179 /* Parameters don't add up */
1188 if (cc != vcol/ccol) {
1201 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1206 vc_cons[i].d->vc_scan_lines = vlin;
1208 vc_cons[i].d->vc_font.height = clin;
1209 vc_cons[i].d->vc_resize_user = 1;
1210 vc_resize(vc_cons[i].d, cc, ll);
1219 op.op = KD_FONT_OP_SET;
1220 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
1225 ret = con_font_op(vc_cons[fg_console].d, &op);
1230 op.op = KD_FONT_OP_GET;
1231 op.flags = KD_FONT_FLAG_OLD;
1236 ret = con_font_op(vc_cons[fg_console].d, &op);
1244 ret = con_set_cmap(up);
1248 ret = con_get_cmap(up);
1253 ret = do_fontx_ioctl(cmd, up, perm, &op);
1261 #ifdef BROKEN_GRAPHICS_PROGRAMS
1262 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
1263 font is not saved. */
1268 op.op = KD_FONT_OP_SET_DEFAULT;
1270 ret = con_font_op(vc_cons[fg_console].d, &op);
1273 con_set_default_unimap(vc_cons[fg_console].d);
1280 if (copy_from_user(&op, up, sizeof(op))) {
1284 if (!perm && op.op != KD_FONT_OP_GET)
1286 ret = con_font_op(vc, &op);
1289 if (copy_to_user(up, &op, sizeof(op)))
1298 ret = con_set_trans_old(up);
1302 ret = con_get_trans_old(up);
1305 case PIO_UNISCRNMAP:
1309 ret = con_set_trans_new(up);
1312 case GIO_UNISCRNMAP:
1313 ret = con_get_trans_new(up);
1317 { struct unimapinit ui;
1320 ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
1324 con_clear_unimap(vc, &ui);
1330 ret = do_unimap_ioctl(cmd, up, perm, vc);
1334 if (!capable(CAP_SYS_TTY_CONFIG))
1338 case VT_UNLOCKSWITCH:
1339 if (!capable(CAP_SYS_TTY_CONFIG))
1343 case VT_GETHIFONTMASK:
1344 ret = put_user(vc->vc_hi_font_mask,
1345 (unsigned short __user *)arg);
1348 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1361 void reset_vc(struct vc_data *vc)
1363 vc->vc_mode = KD_TEXT;
1364 kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
1365 vc->vt_mode.mode = VT_AUTO;
1366 vc->vt_mode.waitv = 0;
1367 vc->vt_mode.relsig = 0;
1368 vc->vt_mode.acqsig = 0;
1369 vc->vt_mode.frsig = 0;
1370 put_pid(vc->vt_pid);
1373 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1377 void vc_SAK(struct work_struct *work)
1380 container_of(work, struct vc, SAK_work);
1382 struct tty_struct *tty;
1389 * SAK should also work in all raw modes and reset
1399 #ifdef CONFIG_COMPAT
1401 struct compat_consolefontdesc {
1402 unsigned short charcount; /* characters in font (256 or 512) */
1403 unsigned short charheight; /* scan lines per character (1-32) */
1404 compat_caddr_t chardata; /* font data in expanded form */
1408 compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1409 int perm, struct console_font_op *op)
1411 struct compat_consolefontdesc cfdarg;
1414 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1421 op->op = KD_FONT_OP_SET;
1422 op->flags = KD_FONT_FLAG_OLD;
1424 op->height = cfdarg.charheight;
1425 op->charcount = cfdarg.charcount;
1426 op->data = compat_ptr(cfdarg.chardata);
1427 return con_font_op(vc_cons[fg_console].d, op);
1429 op->op = KD_FONT_OP_GET;
1430 op->flags = KD_FONT_FLAG_OLD;
1432 op->height = cfdarg.charheight;
1433 op->charcount = cfdarg.charcount;
1434 op->data = compat_ptr(cfdarg.chardata);
1435 i = con_font_op(vc_cons[fg_console].d, op);
1438 cfdarg.charheight = op->height;
1439 cfdarg.charcount = op->charcount;
1440 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1447 struct compat_console_font_op {
1448 compat_uint_t op; /* operation code KD_FONT_OP_* */
1449 compat_uint_t flags; /* KD_FONT_FLAG_* */
1450 compat_uint_t width, height; /* font size */
1451 compat_uint_t charcount;
1452 compat_caddr_t data; /* font data with height fixed to 32 */
1456 compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1457 int perm, struct console_font_op *op, struct vc_data *vc)
1461 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1463 if (!perm && op->op != KD_FONT_OP_GET)
1465 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
1466 op->flags |= KD_FONT_FLAG_OLD;
1467 i = con_font_op(vc, op);
1470 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1471 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1476 struct compat_unimapdesc {
1477 unsigned short entry_ct;
1478 compat_caddr_t entries;
1482 compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1483 int perm, struct vc_data *vc)
1485 struct compat_unimapdesc tmp;
1486 struct unipair __user *tmp_entries;
1488 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1490 tmp_entries = compat_ptr(tmp.entries);
1492 if (!access_ok(VERIFY_WRITE, tmp_entries,
1493 tmp.entry_ct*sizeof(struct unipair)))
1499 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1501 if (!perm && fg_console != vc->vc_num)
1503 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1508 long vt_compat_ioctl(struct tty_struct *tty,
1509 unsigned int cmd, unsigned long arg)
1511 struct vc_data *vc = tty->driver_data;
1512 struct console_font_op op; /* used in multiple places here */
1513 unsigned int console;
1514 void __user *up = (void __user *)arg;
1518 console = vc->vc_num;
1522 if (!vc_cons_allocated(console)) { /* impossible? */
1528 * To have permissions to do most of the vt ioctls, we either have
1529 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1532 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1537 * these need special handlers for incompatible data structures
1541 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1545 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1550 ret = compat_unimap_ioctl(cmd, up, perm, vc);
1554 * all these treat 'arg' as an integer
1573 case VT_DISALLOCATE:
1579 * the rest has a compatible data structure behind arg,
1580 * but we have to convert it to a proper 64 bit pointer.
1583 arg = (unsigned long)compat_ptr(arg);
1592 return vt_ioctl(tty, cmd, arg);
1596 #endif /* CONFIG_COMPAT */
1600 * Performs the back end of a vt switch. Called under the console
1603 static void complete_change_console(struct vc_data *vc)
1605 unsigned char old_vc_mode;
1606 int old = fg_console;
1608 last_console = fg_console;
1611 * If we're switching, we could be going from KD_GRAPHICS to
1612 * KD_TEXT mode or vice versa, which means we need to blank or
1613 * unblank the screen later.
1615 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1619 * This can't appear below a successful kill_pid(). If it did,
1620 * then the *blank_screen operation could occur while X, having
1621 * received acqsig, is waking up on another processor. This
1622 * condition can lead to overlapping accesses to the VGA range
1623 * and the framebuffer (causing system lockups).
1625 * To account for this we duplicate this code below only if the
1626 * controlling process is gone and we've called reset_vc.
1628 if (old_vc_mode != vc->vc_mode) {
1629 if (vc->vc_mode == KD_TEXT)
1630 do_unblank_screen(1);
1636 * If this new console is under process control, send it a signal
1637 * telling it that it has acquired. Also check if it has died and
1638 * clean up (similar to logic employed in change_console())
1640 if (vc->vt_mode.mode == VT_PROCESS) {
1642 * Send the signal as privileged - kill_pid() will
1643 * tell us if the process has gone or something else
1646 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1648 * The controlling process has died, so we revert back to
1649 * normal operation. In this case, we'll also change back
1650 * to KD_TEXT mode. I'm not sure if this is strictly correct
1651 * but it saves the agony when the X server dies and the screen
1652 * remains blanked due to KD_GRAPHICS! It would be nice to do
1653 * this outside of VT_PROCESS but there is no single process
1654 * to account for and tracking tty count may be undesirable.
1658 if (old_vc_mode != vc->vc_mode) {
1659 if (vc->vc_mode == KD_TEXT)
1660 do_unblank_screen(1);
1668 * Wake anyone waiting for their VT to activate
1670 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
1675 * Performs the front-end of a vt switch
1677 void change_console(struct vc_data *new_vc)
1681 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1685 * If this vt is in process mode, then we need to handshake with
1686 * that process before switching. Essentially, we store where that
1687 * vt wants to switch to and wait for it to tell us when it's done
1688 * (via VT_RELDISP ioctl).
1690 * We also check to see if the controlling process still exists.
1691 * If it doesn't, we reset this vt to auto mode and continue.
1692 * This is a cheap way to track process control. The worst thing
1693 * that can happen is: we send a signal to a process, it dies, and
1694 * the switch gets "lost" waiting for a response; hopefully, the
1695 * user will try again, we'll detect the process is gone (unless
1696 * the user waits just the right amount of time :-) and revert the
1697 * vt to auto control.
1699 vc = vc_cons[fg_console].d;
1700 if (vc->vt_mode.mode == VT_PROCESS) {
1702 * Send the signal as privileged - kill_pid() will
1703 * tell us if the process has gone or something else
1706 * We need to set vt_newvt *before* sending the signal or we
1709 vc->vt_newvt = new_vc->vc_num;
1710 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1712 * It worked. Mark the vt to switch to and
1713 * return. The process needs to send us a
1714 * VT_RELDISP ioctl to complete the switch.
1720 * The controlling process has died, so we revert back to
1721 * normal operation. In this case, we'll also change back
1722 * to KD_TEXT mode. I'm not sure if this is strictly correct
1723 * but it saves the agony when the X server dies and the screen
1724 * remains blanked due to KD_GRAPHICS! It would be nice to do
1725 * this outside of VT_PROCESS but there is no single process
1726 * to account for and tracking tty count may be undesirable.
1731 * Fall through to normal (VT_AUTO) handling of the switch...
1736 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1738 if (vc->vc_mode == KD_GRAPHICS)
1741 complete_change_console(new_vc);
1744 /* Perform a kernel triggered VT switch for suspend/resume */
1746 static int disable_vt_switch;
1748 int vt_move_to_console(unsigned int vt, int alloc)
1753 /* Graphics mode - up to X */
1754 if (disable_vt_switch) {
1760 if (alloc && vc_allocate(vt)) {
1761 /* we can't have a free VC for now. Too bad,
1762 * we don't want to mess the screen for now. */
1767 if (set_console(vt)) {
1769 * We're unable to switch to the SUSPEND_CONSOLE.
1770 * Let the calling function know so it can decide
1778 if (vt_waitactive(vt + 1)) {
1779 pr_debug("Suspend: Can't switch VCs.");
1788 * Normally during a suspend, we allocate a new console and switch to it.
1789 * When we resume, we switch back to the original console. This switch
1790 * can be slow, so on systems where the framebuffer can handle restoration
1791 * of video registers anyways, there's little point in doing the console
1792 * switch. This function allows you to disable it by passing it '0'.
1794 void pm_set_vt_switch(int do_switch)
1797 disable_vt_switch = !do_switch;
1800 EXPORT_SYMBOL(pm_set_vt_switch);