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/signal.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/suspend.h>
29 #include <linux/timex.h>
32 #include <linux/uaccess.h>
34 #include <linux/kbd_kern.h>
35 #include <linux/vt_kern.h>
36 #include <linux/kbd_diacr.h>
37 #include <linux/selection.h>
40 extern struct tty_driver
*console_driver
;
42 #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
43 #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons)
46 * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
47 * experimentation and study of X386 SYSV handling.
49 * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
50 * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
51 * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
52 * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
53 * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
54 * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
55 * to the current console is done by the main ioctl code.
59 #include <linux/syscalls.h>
62 static void complete_change_console(struct vc_data
*vc
);
65 * User space VT_EVENT handlers
68 struct vt_event_wait
{
69 struct list_head list
;
70 struct vt_event event
;
74 static LIST_HEAD(vt_events
);
75 static DEFINE_SPINLOCK(vt_event_lock
);
76 static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue
);
80 * @event: the event that occurred
84 * Post an VT event to interested VT handlers
87 void vt_event_post(unsigned int event
, unsigned int old
, unsigned int new)
89 struct list_head
*pos
, *head
;
93 spin_lock_irqsave(&vt_event_lock
, flags
);
96 list_for_each(pos
, head
) {
97 struct vt_event_wait
*ve
= list_entry(pos
,
98 struct vt_event_wait
, list
);
99 if (!(ve
->event
.event
& event
))
101 ve
->event
.event
= event
;
102 /* kernel view is consoles 0..n-1, user space view is
103 console 1..n with 0 meaning current, so we must bias */
104 ve
->event
.oldev
= old
+ 1;
105 ve
->event
.newev
= new + 1;
109 spin_unlock_irqrestore(&vt_event_lock
, flags
);
111 wake_up_interruptible(&vt_event_waitqueue
);
114 static void __vt_event_queue(struct vt_event_wait
*vw
)
117 /* Prepare the event */
118 INIT_LIST_HEAD(&vw
->list
);
120 /* Queue our event */
121 spin_lock_irqsave(&vt_event_lock
, flags
);
122 list_add(&vw
->list
, &vt_events
);
123 spin_unlock_irqrestore(&vt_event_lock
, flags
);
126 static void __vt_event_wait(struct vt_event_wait
*vw
)
128 /* Wait for it to pass */
129 wait_event_interruptible(vt_event_waitqueue
, vw
->done
);
132 static void __vt_event_dequeue(struct vt_event_wait
*vw
)
137 spin_lock_irqsave(&vt_event_lock
, flags
);
139 spin_unlock_irqrestore(&vt_event_lock
, flags
);
143 * vt_event_wait - wait for an event
146 * Waits for an event to occur which completes our vt_event_wait
147 * structure. On return the structure has wv->done set to 1 for success
148 * or 0 if some event such as a signal ended the wait.
151 static void vt_event_wait(struct vt_event_wait
*vw
)
153 __vt_event_queue(vw
);
155 __vt_event_dequeue(vw
);
159 * vt_event_wait_ioctl - event ioctl handler
160 * @arg: argument to ioctl
162 * Implement the VT_WAITEVENT ioctl using the VT event interface
165 static int vt_event_wait_ioctl(struct vt_event __user
*event
)
167 struct vt_event_wait vw
;
169 if (copy_from_user(&vw
.event
, event
, sizeof(struct vt_event
)))
171 /* Highest supported event for now */
172 if (vw
.event
.event
& ~VT_MAX_EVENT
)
176 /* If it occurred report it */
178 if (copy_to_user(event
, &vw
.event
, sizeof(struct vt_event
)))
186 * vt_waitactive - active console wait
190 * Helper for event waits. Used to implement the legacy
191 * event waiting ioctls in terms of events
194 int vt_waitactive(int n
)
196 struct vt_event_wait vw
;
198 vw
.event
.event
= VT_EVENT_SWITCH
;
199 __vt_event_queue(&vw
);
200 if (n
== fg_console
+ 1) {
201 __vt_event_dequeue(&vw
);
204 __vt_event_wait(&vw
);
205 __vt_event_dequeue(&vw
);
208 } while (vw
.event
.newev
!= n
);
213 * these are the valid i/o ports we're allowed to change. they map all the
216 #define GPFIRST 0x3b4
218 #define GPNUM (GPLAST - GPFIRST + 1)
223 do_fontx_ioctl(int cmd
, struct consolefontdesc __user
*user_cfd
, int perm
, struct console_font_op
*op
)
225 struct consolefontdesc cfdarg
;
228 if (copy_from_user(&cfdarg
, user_cfd
, sizeof(struct consolefontdesc
)))
235 op
->op
= KD_FONT_OP_SET
;
236 op
->flags
= KD_FONT_FLAG_OLD
;
238 op
->height
= cfdarg
.charheight
;
239 op
->charcount
= cfdarg
.charcount
;
240 op
->data
= cfdarg
.chardata
;
241 return con_font_op(vc_cons
[fg_console
].d
, op
);
243 op
->op
= KD_FONT_OP_GET
;
244 op
->flags
= KD_FONT_FLAG_OLD
;
246 op
->height
= cfdarg
.charheight
;
247 op
->charcount
= cfdarg
.charcount
;
248 op
->data
= cfdarg
.chardata
;
249 i
= con_font_op(vc_cons
[fg_console
].d
, op
);
252 cfdarg
.charheight
= op
->height
;
253 cfdarg
.charcount
= op
->charcount
;
254 if (copy_to_user(user_cfd
, &cfdarg
, sizeof(struct consolefontdesc
)))
263 do_unimap_ioctl(int cmd
, struct unimapdesc __user
*user_ud
, int perm
, struct vc_data
*vc
)
265 struct unimapdesc tmp
;
267 if (copy_from_user(&tmp
, user_ud
, sizeof tmp
))
273 return con_set_unimap(vc
, tmp
.entry_ct
, tmp
.entries
);
275 if (!perm
&& fg_console
!= vc
->vc_num
)
277 return con_get_unimap(vc
, tmp
.entry_ct
, &(user_ud
->entry_ct
), tmp
.entries
);
282 /* deallocate a single console, if possible (leave 0) */
283 static int vt_disallocate(unsigned int vc_num
)
285 struct vc_data
*vc
= NULL
;
292 vc
= vc_deallocate(vc_num
);
295 if (vc
&& vc_num
>= MIN_NR_CONSOLES
) {
296 tty_port_destroy(&vc
->port
);
303 /* deallocate all unused consoles, but leave 0 */
304 static void vt_disallocate_all(void)
306 struct vc_data
*vc
[MAX_NR_CONSOLES
];
310 for (i
= 1; i
< MAX_NR_CONSOLES
; i
++)
312 vc
[i
] = vc_deallocate(i
);
317 for (i
= 1; i
< MAX_NR_CONSOLES
; i
++) {
318 if (vc
[i
] && i
>= MIN_NR_CONSOLES
) {
319 tty_port_destroy(&vc
[i
]->port
);
327 * We handle the console-specific ioctl's here. We allow the
328 * capability to modify any console, not just the fg_console.
330 int vt_ioctl(struct tty_struct
*tty
,
331 unsigned int cmd
, unsigned long arg
)
333 struct vc_data
*vc
= tty
->driver_data
;
334 struct console_font_op op
; /* used in multiple places here */
335 unsigned int console
;
338 void __user
*up
= (void __user
*)arg
;
342 console
= vc
->vc_num
;
345 if (!vc_cons_allocated(console
)) { /* impossible? */
352 * To have permissions to do most of the vt ioctls, we either have
353 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
356 if (current
->signal
->tty
== tty
|| capable(CAP_SYS_TTY_CONFIG
))
361 ret
= tioclinux(tty
, arg
);
367 * The use of PIT_TICK_RATE is historic, it used to be
368 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
369 * and 2.6.36, which was a minor but unfortunate ABI
370 * change. kd_mksound is locked by the input layer.
373 arg
= PIT_TICK_RATE
/ arg
;
381 unsigned int ticks
, count
;
384 * Generate the tone for the appropriate number of ticks.
385 * If the time is zero, turn off sound ourselves.
387 ticks
= msecs_to_jiffies((arg
>> 16) & 0xffff);
388 count
= ticks
? (arg
& 0xffff) : 0;
390 count
= PIT_TICK_RATE
/ count
;
391 kd_mksound(count
, ticks
);
400 ret
= put_user(ucval
, (char __user
*)arg
);
404 * These cannot be implemented on any machine that implements
405 * ioperm() in user level (such as Alpha PCs) or not at all.
407 * XXX: you should never use these, just call ioperm directly..
413 * KDADDIO and KDDELIO may be able to add ports beyond what
414 * we reject here, but to be safe...
416 * These are locked internally via sys_ioperm
418 if (arg
< GPFIRST
|| arg
> GPLAST
) {
422 ret
= sys_ioperm(arg
, 1, (cmd
== KDADDIO
)) ? -ENXIO
: 0;
427 ret
= sys_ioperm(GPFIRST
, GPNUM
,
428 (cmd
== KDENABIO
)) ? -ENXIO
: 0;
432 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
436 struct kbd_repeat kbrep
;
438 if (!capable(CAP_SYS_TTY_CONFIG
))
441 if (copy_from_user(&kbrep
, up
, sizeof(struct kbd_repeat
))) {
445 ret
= kbd_rate(&kbrep
);
448 if (copy_to_user(up
, &kbrep
, sizeof(struct kbd_repeat
)))
455 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
456 * doesn't do a whole lot. i'm not sure if it should do any
457 * restoration of modes or what...
459 * XXX It should at least call into the driver, fbdev's definitely
460 * need to restore their engine state. --BenH
476 /* FIXME: this needs the console lock extending */
477 if (vc
->vc_mode
== (unsigned char) arg
)
479 vc
->vc_mode
= (unsigned char) arg
;
480 if (console
!= fg_console
)
483 * explicitly blank/unblank the screen if switching modes
487 do_unblank_screen(1);
500 * these work like a combination of mmap and KDENABIO.
501 * this could be easily finished.
509 ret
= vt_do_kdskbmode(console
, arg
);
511 tty_ldisc_flush(tty
);
515 uival
= vt_do_kdgkbmode(console
);
516 ret
= put_user(uival
, (int __user
*)arg
);
519 /* this could be folded into KDSKBMODE, but for compatibility
520 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
522 ret
= vt_do_kdskbmeta(console
, arg
);
526 /* FIXME: should review whether this is worth locking */
527 uival
= vt_do_kdgkbmeta(console
);
529 ret
= put_user(uival
, (int __user
*)arg
);
534 if(!capable(CAP_SYS_TTY_CONFIG
))
536 ret
= vt_do_kbkeycode_ioctl(cmd
, up
, perm
);
541 ret
= vt_do_kdsk_ioctl(cmd
, up
, perm
, console
);
546 ret
= vt_do_kdgkb_ioctl(cmd
, up
, perm
);
549 /* Diacritical processing. Handled in keyboard.c as it has
550 to operate on the keyboard locks and structures */
555 ret
= vt_do_diacrit(cmd
, up
, perm
);
558 /* the ioctls below read/set the flags usually shown in the leds */
559 /* don't use them - they will go away without warning */
564 ret
= vt_do_kdskled(console
, cmd
, arg
, perm
);
568 * A process can indicate its willingness to accept signals
569 * generated by pressing an appropriate key combination.
570 * Thus, one can have a daemon that e.g. spawns a new console
571 * upon a keypress and then changes to it.
572 * See also the kbrequest field of inittab(5).
576 if (!perm
|| !capable(CAP_KILL
))
578 if (!valid_signal(arg
) || arg
< 1 || arg
== SIGKILL
)
581 spin_lock_irq(&vt_spawn_con
.lock
);
582 put_pid(vt_spawn_con
.pid
);
583 vt_spawn_con
.pid
= get_pid(task_pid(current
));
584 vt_spawn_con
.sig
= arg
;
585 spin_unlock_irq(&vt_spawn_con
.lock
);
596 if (copy_from_user(&tmp
, up
, sizeof(struct vt_mode
))) {
600 if (tmp
.mode
!= VT_AUTO
&& tmp
.mode
!= VT_PROCESS
) {
606 /* the frsig is ignored, so we set it to 0 */
607 vc
->vt_mode
.frsig
= 0;
609 vc
->vt_pid
= get_pid(task_pid(current
));
610 /* no switch is required -- saw@shade.msu.ru */
622 memcpy(&tmp
, &vc
->vt_mode
, sizeof(struct vt_mode
));
625 rc
= copy_to_user(up
, &tmp
, sizeof(struct vt_mode
));
632 * Returns global vt state. Note that VT 0 is always open, since
633 * it's an alias for the current VT, and people can't use it here.
634 * We cannot return state for more than 16 VTs, since v_state is short.
638 struct vt_stat __user
*vtstat
= up
;
639 unsigned short state
, mask
;
641 /* Review: FIXME: Console lock ? */
642 if (put_user(fg_console
+ 1, &vtstat
->v_active
))
645 state
= 1; /* /dev/tty0 is always open */
646 for (i
= 0, mask
= 2; i
< MAX_NR_CONSOLES
&& mask
;
650 ret
= put_user(state
, &vtstat
->v_state
);
656 * Returns the first available (non-opened) console.
659 /* FIXME: locking ? - but then this is a stupid API */
660 for (i
= 0; i
< MAX_NR_CONSOLES
; ++i
)
661 if (! VT_IS_IN_USE(i
))
663 uival
= i
< MAX_NR_CONSOLES
? (i
+1) : -1;
667 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
668 * with num >= 1 (switches to vt 0, our console, are not allowed, just
669 * to preserve sanity).
674 if (arg
== 0 || arg
> MAX_NR_CONSOLES
)
679 ret
= vc_allocate(arg
);
689 struct vt_setactivate vsa
;
694 if (copy_from_user(&vsa
, (struct vt_setactivate __user
*)arg
,
695 sizeof(struct vt_setactivate
))) {
699 if (vsa
.console
== 0 || vsa
.console
> MAX_NR_CONSOLES
)
704 ret
= vc_allocate(vsa
.console
);
707 /* This is safe providing we don't drop the
708 console sem between vc_allocate and
709 finishing referencing nvc */
710 nvc
= vc_cons
[vsa
.console
].d
;
711 nvc
->vt_mode
= vsa
.mode
;
712 nvc
->vt_mode
.frsig
= 0;
713 put_pid(nvc
->vt_pid
);
714 nvc
->vt_pid
= get_pid(task_pid(current
));
719 /* Commence switch and lock */
720 /* Review set_console locks */
721 set_console(vsa
.console
);
727 * wait until the specified VT has been activated
732 if (arg
== 0 || arg
> MAX_NR_CONSOLES
)
735 ret
= vt_waitactive(arg
);
739 * If a vt is under process control, the kernel will not switch to it
740 * immediately, but postpone the operation until the process calls this
741 * ioctl, allowing the switch to complete.
743 * According to the X sources this is the behavior:
744 * 0: pending switch-from not OK
745 * 1: pending switch-from OK
746 * 2: completed switch-to OK
753 if (vc
->vt_mode
.mode
!= VT_PROCESS
) {
759 * Switching-from response
761 if (vc
->vt_newvt
>= 0) {
764 * Switch disallowed, so forget we were trying
771 * The current vt has been released, so
772 * complete the switch.
775 newvt
= vc
->vt_newvt
;
777 ret
= vc_allocate(newvt
);
783 * When we actually do the console switch,
784 * make sure we are atomic with respect to
785 * other console switches..
787 complete_change_console(vc_cons
[newvt
].d
);
791 * Switched-to response
794 * If it's just an ACK, ignore it
796 if (arg
!= VT_ACKACQ
)
803 * Disallocate memory associated to VT (but leave VT1)
806 if (arg
> MAX_NR_CONSOLES
) {
811 vt_disallocate_all();
813 ret
= vt_disallocate(--arg
);
818 struct vt_sizes __user
*vtsizes
= up
;
824 if (get_user(ll
, &vtsizes
->v_rows
) ||
825 get_user(cc
, &vtsizes
->v_cols
))
829 for (i
= 0; i
< MAX_NR_CONSOLES
; i
++) {
833 vc
->vc_resize_user
= 1;
834 /* FIXME: review v tty lock */
835 vc_resize(vc_cons
[i
].d
, cc
, ll
);
845 struct vt_consize __user
*vtconsize
= up
;
846 ushort ll
,cc
,vlin
,clin
,vcol
,ccol
;
849 if (!access_ok(VERIFY_READ
, vtconsize
,
850 sizeof(struct vt_consize
))) {
854 /* FIXME: Should check the copies properly */
855 __get_user(ll
, &vtconsize
->v_rows
);
856 __get_user(cc
, &vtconsize
->v_cols
);
857 __get_user(vlin
, &vtconsize
->v_vlin
);
858 __get_user(clin
, &vtconsize
->v_clin
);
859 __get_user(vcol
, &vtconsize
->v_vcol
);
860 __get_user(ccol
, &vtconsize
->v_ccol
);
861 vlin
= vlin
? vlin
: vc
->vc_scan_lines
;
864 if (ll
!= vlin
/clin
) {
865 /* Parameters don't add up */
874 if (cc
!= vcol
/ccol
) {
887 for (i
= 0; i
< MAX_NR_CONSOLES
; i
++) {
892 vc_cons
[i
].d
->vc_scan_lines
= vlin
;
894 vc_cons
[i
].d
->vc_font
.height
= clin
;
895 vc_cons
[i
].d
->vc_resize_user
= 1;
896 vc_resize(vc_cons
[i
].d
, cc
, ll
);
905 op
.op
= KD_FONT_OP_SET
;
906 op
.flags
= KD_FONT_FLAG_OLD
| KD_FONT_FLAG_DONT_RECALC
; /* Compatibility */
911 ret
= con_font_op(vc_cons
[fg_console
].d
, &op
);
916 op
.op
= KD_FONT_OP_GET
;
917 op
.flags
= KD_FONT_FLAG_OLD
;
922 ret
= con_font_op(vc_cons
[fg_console
].d
, &op
);
930 ret
= con_set_cmap(up
);
934 ret
= con_get_cmap(up
);
939 ret
= do_fontx_ioctl(cmd
, up
, perm
, &op
);
947 #ifdef BROKEN_GRAPHICS_PROGRAMS
948 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
949 font is not saved. */
954 op
.op
= KD_FONT_OP_SET_DEFAULT
;
956 ret
= con_font_op(vc_cons
[fg_console
].d
, &op
);
960 con_set_default_unimap(vc_cons
[fg_console
].d
);
968 if (copy_from_user(&op
, up
, sizeof(op
))) {
972 if (!perm
&& op
.op
!= KD_FONT_OP_GET
)
974 ret
= con_font_op(vc
, &op
);
977 if (copy_to_user(up
, &op
, sizeof(op
)))
986 ret
= con_set_trans_old(up
);
990 ret
= con_get_trans_old(up
);
997 ret
= con_set_trans_new(up
);
1000 case GIO_UNISCRNMAP
:
1001 ret
= con_get_trans_new(up
);
1007 con_clear_unimap(vc
);
1012 ret
= do_unimap_ioctl(cmd
, up
, perm
, vc
);
1016 if (!capable(CAP_SYS_TTY_CONFIG
))
1020 case VT_UNLOCKSWITCH
:
1021 if (!capable(CAP_SYS_TTY_CONFIG
))
1025 case VT_GETHIFONTMASK
:
1026 ret
= put_user(vc
->vc_hi_font_mask
,
1027 (unsigned short __user
*)arg
);
1030 ret
= vt_event_wait_ioctl((struct vt_event __user
*)arg
);
1039 void reset_vc(struct vc_data
*vc
)
1041 vc
->vc_mode
= KD_TEXT
;
1042 vt_reset_unicode(vc
->vc_num
);
1043 vc
->vt_mode
.mode
= VT_AUTO
;
1044 vc
->vt_mode
.waitv
= 0;
1045 vc
->vt_mode
.relsig
= 0;
1046 vc
->vt_mode
.acqsig
= 0;
1047 vc
->vt_mode
.frsig
= 0;
1048 put_pid(vc
->vt_pid
);
1051 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1055 void vc_SAK(struct work_struct
*work
)
1058 container_of(work
, struct vc
, SAK_work
);
1060 struct tty_struct
*tty
;
1065 /* FIXME: review tty ref counting */
1068 * SAK should also work in all raw modes and reset
1078 #ifdef CONFIG_COMPAT
1080 struct compat_consolefontdesc
{
1081 unsigned short charcount
; /* characters in font (256 or 512) */
1082 unsigned short charheight
; /* scan lines per character (1-32) */
1083 compat_caddr_t chardata
; /* font data in expanded form */
1087 compat_fontx_ioctl(int cmd
, struct compat_consolefontdesc __user
*user_cfd
,
1088 int perm
, struct console_font_op
*op
)
1090 struct compat_consolefontdesc cfdarg
;
1093 if (copy_from_user(&cfdarg
, user_cfd
, sizeof(struct compat_consolefontdesc
)))
1100 op
->op
= KD_FONT_OP_SET
;
1101 op
->flags
= KD_FONT_FLAG_OLD
;
1103 op
->height
= cfdarg
.charheight
;
1104 op
->charcount
= cfdarg
.charcount
;
1105 op
->data
= compat_ptr(cfdarg
.chardata
);
1106 return con_font_op(vc_cons
[fg_console
].d
, op
);
1108 op
->op
= KD_FONT_OP_GET
;
1109 op
->flags
= KD_FONT_FLAG_OLD
;
1111 op
->height
= cfdarg
.charheight
;
1112 op
->charcount
= cfdarg
.charcount
;
1113 op
->data
= compat_ptr(cfdarg
.chardata
);
1114 i
= con_font_op(vc_cons
[fg_console
].d
, op
);
1117 cfdarg
.charheight
= op
->height
;
1118 cfdarg
.charcount
= op
->charcount
;
1119 if (copy_to_user(user_cfd
, &cfdarg
, sizeof(struct compat_consolefontdesc
)))
1126 struct compat_console_font_op
{
1127 compat_uint_t op
; /* operation code KD_FONT_OP_* */
1128 compat_uint_t flags
; /* KD_FONT_FLAG_* */
1129 compat_uint_t width
, height
; /* font size */
1130 compat_uint_t charcount
;
1131 compat_caddr_t data
; /* font data with height fixed to 32 */
1135 compat_kdfontop_ioctl(struct compat_console_font_op __user
*fontop
,
1136 int perm
, struct console_font_op
*op
, struct vc_data
*vc
)
1140 if (copy_from_user(op
, fontop
, sizeof(struct compat_console_font_op
)))
1142 if (!perm
&& op
->op
!= KD_FONT_OP_GET
)
1144 op
->data
= compat_ptr(((struct compat_console_font_op
*)op
)->data
);
1145 i
= con_font_op(vc
, op
);
1148 ((struct compat_console_font_op
*)op
)->data
= (unsigned long)op
->data
;
1149 if (copy_to_user(fontop
, op
, sizeof(struct compat_console_font_op
)))
1154 struct compat_unimapdesc
{
1155 unsigned short entry_ct
;
1156 compat_caddr_t entries
;
1160 compat_unimap_ioctl(unsigned int cmd
, struct compat_unimapdesc __user
*user_ud
,
1161 int perm
, struct vc_data
*vc
)
1163 struct compat_unimapdesc tmp
;
1164 struct unipair __user
*tmp_entries
;
1166 if (copy_from_user(&tmp
, user_ud
, sizeof tmp
))
1168 tmp_entries
= compat_ptr(tmp
.entries
);
1173 return con_set_unimap(vc
, tmp
.entry_ct
, tmp_entries
);
1175 if (!perm
&& fg_console
!= vc
->vc_num
)
1177 return con_get_unimap(vc
, tmp
.entry_ct
, &(user_ud
->entry_ct
), tmp_entries
);
1182 long vt_compat_ioctl(struct tty_struct
*tty
,
1183 unsigned int cmd
, unsigned long arg
)
1185 struct vc_data
*vc
= tty
->driver_data
;
1186 struct console_font_op op
; /* used in multiple places here */
1187 unsigned int console
;
1188 void __user
*up
= (void __user
*)arg
;
1192 console
= vc
->vc_num
;
1194 if (!vc_cons_allocated(console
)) { /* impossible? */
1200 * To have permissions to do most of the vt ioctls, we either have
1201 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1204 if (current
->signal
->tty
== tty
|| capable(CAP_SYS_TTY_CONFIG
))
1209 * these need special handlers for incompatible data structures
1213 ret
= compat_fontx_ioctl(cmd
, up
, perm
, &op
);
1217 ret
= compat_kdfontop_ioctl(up
, perm
, &op
, vc
);
1222 ret
= compat_unimap_ioctl(cmd
, up
, perm
, vc
);
1226 * all these treat 'arg' as an integer
1245 case VT_DISALLOCATE
:
1251 * the rest has a compatible data structure behind arg,
1252 * but we have to convert it to a proper 64 bit pointer.
1255 arg
= (unsigned long)compat_ptr(arg
);
1262 return vt_ioctl(tty
, cmd
, arg
);
1266 #endif /* CONFIG_COMPAT */
1270 * Performs the back end of a vt switch. Called under the console
1273 static void complete_change_console(struct vc_data
*vc
)
1275 unsigned char old_vc_mode
;
1276 int old
= fg_console
;
1278 last_console
= fg_console
;
1281 * If we're switching, we could be going from KD_GRAPHICS to
1282 * KD_TEXT mode or vice versa, which means we need to blank or
1283 * unblank the screen later.
1285 old_vc_mode
= vc_cons
[fg_console
].d
->vc_mode
;
1289 * This can't appear below a successful kill_pid(). If it did,
1290 * then the *blank_screen operation could occur while X, having
1291 * received acqsig, is waking up on another processor. This
1292 * condition can lead to overlapping accesses to the VGA range
1293 * and the framebuffer (causing system lockups).
1295 * To account for this we duplicate this code below only if the
1296 * controlling process is gone and we've called reset_vc.
1298 if (old_vc_mode
!= vc
->vc_mode
) {
1299 if (vc
->vc_mode
== KD_TEXT
)
1300 do_unblank_screen(1);
1306 * If this new console is under process control, send it a signal
1307 * telling it that it has acquired. Also check if it has died and
1308 * clean up (similar to logic employed in change_console())
1310 if (vc
->vt_mode
.mode
== VT_PROCESS
) {
1312 * Send the signal as privileged - kill_pid() will
1313 * tell us if the process has gone or something else
1316 if (kill_pid(vc
->vt_pid
, vc
->vt_mode
.acqsig
, 1) != 0) {
1318 * The controlling process has died, so we revert back to
1319 * normal operation. In this case, we'll also change back
1320 * to KD_TEXT mode. I'm not sure if this is strictly correct
1321 * but it saves the agony when the X server dies and the screen
1322 * remains blanked due to KD_GRAPHICS! It would be nice to do
1323 * this outside of VT_PROCESS but there is no single process
1324 * to account for and tracking tty count may be undesirable.
1328 if (old_vc_mode
!= vc
->vc_mode
) {
1329 if (vc
->vc_mode
== KD_TEXT
)
1330 do_unblank_screen(1);
1338 * Wake anyone waiting for their VT to activate
1340 vt_event_post(VT_EVENT_SWITCH
, old
, vc
->vc_num
);
1345 * Performs the front-end of a vt switch
1347 void change_console(struct vc_data
*new_vc
)
1351 if (!new_vc
|| new_vc
->vc_num
== fg_console
|| vt_dont_switch
)
1355 * If this vt is in process mode, then we need to handshake with
1356 * that process before switching. Essentially, we store where that
1357 * vt wants to switch to and wait for it to tell us when it's done
1358 * (via VT_RELDISP ioctl).
1360 * We also check to see if the controlling process still exists.
1361 * If it doesn't, we reset this vt to auto mode and continue.
1362 * This is a cheap way to track process control. The worst thing
1363 * that can happen is: we send a signal to a process, it dies, and
1364 * the switch gets "lost" waiting for a response; hopefully, the
1365 * user will try again, we'll detect the process is gone (unless
1366 * the user waits just the right amount of time :-) and revert the
1367 * vt to auto control.
1369 vc
= vc_cons
[fg_console
].d
;
1370 if (vc
->vt_mode
.mode
== VT_PROCESS
) {
1372 * Send the signal as privileged - kill_pid() will
1373 * tell us if the process has gone or something else
1376 * We need to set vt_newvt *before* sending the signal or we
1379 vc
->vt_newvt
= new_vc
->vc_num
;
1380 if (kill_pid(vc
->vt_pid
, vc
->vt_mode
.relsig
, 1) == 0) {
1382 * It worked. Mark the vt to switch to and
1383 * return. The process needs to send us a
1384 * VT_RELDISP ioctl to complete the switch.
1390 * The controlling process has died, so we revert back to
1391 * normal operation. In this case, we'll also change back
1392 * to KD_TEXT mode. I'm not sure if this is strictly correct
1393 * but it saves the agony when the X server dies and the screen
1394 * remains blanked due to KD_GRAPHICS! It would be nice to do
1395 * this outside of VT_PROCESS but there is no single process
1396 * to account for and tracking tty count may be undesirable.
1401 * Fall through to normal (VT_AUTO) handling of the switch...
1406 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1408 if (vc
->vc_mode
== KD_GRAPHICS
)
1411 complete_change_console(new_vc
);
1414 /* Perform a kernel triggered VT switch for suspend/resume */
1416 static int disable_vt_switch
;
1418 int vt_move_to_console(unsigned int vt
, int alloc
)
1423 /* Graphics mode - up to X */
1424 if (disable_vt_switch
) {
1430 if (alloc
&& vc_allocate(vt
)) {
1431 /* we can't have a free VC for now. Too bad,
1432 * we don't want to mess the screen for now. */
1437 if (set_console(vt
)) {
1439 * We're unable to switch to the SUSPEND_CONSOLE.
1440 * Let the calling function know so it can decide
1447 if (vt_waitactive(vt
+ 1)) {
1448 pr_debug("Suspend: Can't switch VCs.");
1455 * Normally during a suspend, we allocate a new console and switch to it.
1456 * When we resume, we switch back to the original console. This switch
1457 * can be slow, so on systems where the framebuffer can handle restoration
1458 * of video registers anyways, there's little point in doing the console
1459 * switch. This function allows you to disable it by passing it '0'.
1461 void pm_set_vt_switch(int do_switch
)
1464 disable_vt_switch
= !do_switch
;
1467 EXPORT_SYMBOL(pm_set_vt_switch
);