diff options
author | Glenn Elliott <gelliott@cs.unc.edu> | 2012-03-04 19:47:13 -0500 |
---|---|---|
committer | Glenn Elliott <gelliott@cs.unc.edu> | 2012-03-04 19:47:13 -0500 |
commit | c71c03bda1e86c9d5198c5d83f712e695c4f2a1e (patch) | |
tree | ecb166cb3e2b7e2adb3b5e292245fefd23381ac8 /drivers/tty/vt/vt_ioctl.c | |
parent | ea53c912f8a86a8567697115b6a0d8152beee5c8 (diff) | |
parent | 6a00f206debf8a5c8899055726ad127dbeeed098 (diff) |
Merge branch 'mpi-master' into wip-k-fmlpwip-k-fmlp
Conflicts:
litmus/sched_cedf.c
Diffstat (limited to 'drivers/tty/vt/vt_ioctl.c')
-rw-r--r-- | drivers/tty/vt/vt_ioctl.c | 1800 |
1 files changed, 1800 insertions, 0 deletions
diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c new file mode 100644 index 000000000000..5e096f43bcea --- /dev/null +++ b/drivers/tty/vt/vt_ioctl.c | |||
@@ -0,0 +1,1800 @@ | |||
1 | /* | ||
2 | * Copyright (C) 1992 obz under the linux copyright | ||
3 | * | ||
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 | ||
9 | */ | ||
10 | |||
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> | ||
19 | #include <linux/kd.h> | ||
20 | #include <linux/vt.h> | ||
21 | #include <linux/string.h> | ||
22 | #include <linux/slab.h> | ||
23 | #include <linux/major.h> | ||
24 | #include <linux/fs.h> | ||
25 | #include <linux/console.h> | ||
26 | #include <linux/consolemap.h> | ||
27 | #include <linux/signal.h> | ||
28 | #include <linux/timex.h> | ||
29 | |||
30 | #include <asm/io.h> | ||
31 | #include <asm/uaccess.h> | ||
32 | |||
33 | #include <linux/kbd_kern.h> | ||
34 | #include <linux/vt_kern.h> | ||
35 | #include <linux/kbd_diacr.h> | ||
36 | #include <linux/selection.h> | ||
37 | |||
38 | char vt_dont_switch; | ||
39 | extern struct tty_driver *console_driver; | ||
40 | |||
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) | ||
43 | |||
44 | /* | ||
45 | * Console (vt and kd) routines, as defined by USL SVR4 manual, and by | ||
46 | * experimentation and study of X386 SYSV handling. | ||
47 | * | ||
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. | ||
55 | */ | ||
56 | |||
57 | #ifdef CONFIG_X86 | ||
58 | #include <linux/syscalls.h> | ||
59 | #endif | ||
60 | |||
61 | static void complete_change_console(struct vc_data *vc); | ||
62 | |||
63 | /* | ||
64 | * User space VT_EVENT handlers | ||
65 | */ | ||
66 | |||
67 | struct vt_event_wait { | ||
68 | struct list_head list; | ||
69 | struct vt_event event; | ||
70 | int done; | ||
71 | }; | ||
72 | |||
73 | static LIST_HEAD(vt_events); | ||
74 | static DEFINE_SPINLOCK(vt_event_lock); | ||
75 | static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue); | ||
76 | |||
77 | /** | ||
78 | * vt_event_post | ||
79 | * @event: the event that occurred | ||
80 | * @old: old console | ||
81 | * @new: new console | ||
82 | * | ||
83 | * Post an VT event to interested VT handlers | ||
84 | */ | ||
85 | |||
86 | void vt_event_post(unsigned int event, unsigned int old, unsigned int new) | ||
87 | { | ||
88 | struct list_head *pos, *head; | ||
89 | unsigned long flags; | ||
90 | int wake = 0; | ||
91 | |||
92 | spin_lock_irqsave(&vt_event_lock, flags); | ||
93 | head = &vt_events; | ||
94 | |||
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)) | ||
99 | continue; | ||
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; | ||
105 | wake = 1; | ||
106 | ve->done = 1; | ||
107 | } | ||
108 | spin_unlock_irqrestore(&vt_event_lock, flags); | ||
109 | if (wake) | ||
110 | wake_up_interruptible(&vt_event_waitqueue); | ||
111 | } | ||
112 | |||
113 | /** | ||
114 | * vt_event_wait - wait for an event | ||
115 | * @vw: our event | ||
116 | * | ||
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. | ||
120 | */ | ||
121 | |||
122 | static void vt_event_wait(struct vt_event_wait *vw) | ||
123 | { | ||
124 | unsigned long flags; | ||
125 | /* Prepare the event */ | ||
126 | INIT_LIST_HEAD(&vw->list); | ||
127 | vw->done = 0; | ||
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); | ||
134 | /* Dequeue it */ | ||
135 | spin_lock_irqsave(&vt_event_lock, flags); | ||
136 | list_del(&vw->list); | ||
137 | spin_unlock_irqrestore(&vt_event_lock, flags); | ||
138 | } | ||
139 | |||
140 | /** | ||
141 | * vt_event_wait_ioctl - event ioctl handler | ||
142 | * @arg: argument to ioctl | ||
143 | * | ||
144 | * Implement the VT_WAITEVENT ioctl using the VT event interface | ||
145 | */ | ||
146 | |||
147 | static int vt_event_wait_ioctl(struct vt_event __user *event) | ||
148 | { | ||
149 | struct vt_event_wait vw; | ||
150 | |||
151 | if (copy_from_user(&vw.event, event, sizeof(struct vt_event))) | ||
152 | return -EFAULT; | ||
153 | /* Highest supported event for now */ | ||
154 | if (vw.event.event & ~VT_MAX_EVENT) | ||
155 | return -EINVAL; | ||
156 | |||
157 | vt_event_wait(&vw); | ||
158 | /* If it occurred report it */ | ||
159 | if (vw.done) { | ||
160 | if (copy_to_user(event, &vw.event, sizeof(struct vt_event))) | ||
161 | return -EFAULT; | ||
162 | return 0; | ||
163 | } | ||
164 | return -EINTR; | ||
165 | } | ||
166 | |||
167 | /** | ||
168 | * vt_waitactive - active console wait | ||
169 | * @event: event code | ||
170 | * @n: new console | ||
171 | * | ||
172 | * Helper for event waits. Used to implement the legacy | ||
173 | * event waiting ioctls in terms of events | ||
174 | */ | ||
175 | |||
176 | int vt_waitactive(int n) | ||
177 | { | ||
178 | struct vt_event_wait vw; | ||
179 | do { | ||
180 | if (n == fg_console + 1) | ||
181 | break; | ||
182 | vw.event.event = VT_EVENT_SWITCH; | ||
183 | vt_event_wait(&vw); | ||
184 | if (vw.done == 0) | ||
185 | return -EINTR; | ||
186 | } while (vw.event.newev != n); | ||
187 | return 0; | ||
188 | } | ||
189 | |||
190 | /* | ||
191 | * these are the valid i/o ports we're allowed to change. they map all the | ||
192 | * video ports | ||
193 | */ | ||
194 | #define GPFIRST 0x3b4 | ||
195 | #define GPLAST 0x3df | ||
196 | #define GPNUM (GPLAST - GPFIRST + 1) | ||
197 | |||
198 | #define i (tmp.kb_index) | ||
199 | #define s (tmp.kb_table) | ||
200 | #define v (tmp.kb_value) | ||
201 | static inline int | ||
202 | do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd) | ||
203 | { | ||
204 | struct kbentry tmp; | ||
205 | ushort *key_map, val, ov; | ||
206 | |||
207 | if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry))) | ||
208 | return -EFAULT; | ||
209 | |||
210 | if (!capable(CAP_SYS_TTY_CONFIG)) | ||
211 | perm = 0; | ||
212 | |||
213 | switch (cmd) { | ||
214 | case KDGKBENT: | ||
215 | key_map = key_maps[s]; | ||
216 | if (key_map) { | ||
217 | val = U(key_map[i]); | ||
218 | if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES) | ||
219 | val = K_HOLE; | ||
220 | } else | ||
221 | val = (i ? K_HOLE : K_NOSUCHMAP); | ||
222 | return put_user(val, &user_kbe->kb_value); | ||
223 | case KDSKBENT: | ||
224 | if (!perm) | ||
225 | return -EPERM; | ||
226 | if (!i && v == K_NOSUCHMAP) { | ||
227 | /* deallocate map */ | ||
228 | key_map = key_maps[s]; | ||
229 | if (s && key_map) { | ||
230 | key_maps[s] = NULL; | ||
231 | if (key_map[0] == U(K_ALLOCATED)) { | ||
232 | kfree(key_map); | ||
233 | keymap_count--; | ||
234 | } | ||
235 | } | ||
236 | break; | ||
237 | } | ||
238 | |||
239 | if (KTYP(v) < NR_TYPES) { | ||
240 | if (KVAL(v) > max_vals[KTYP(v)]) | ||
241 | return -EINVAL; | ||
242 | } else | ||
243 | if (kbd->kbdmode != VC_UNICODE) | ||
244 | return -EINVAL; | ||
245 | |||
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 */ | ||
249 | if (!i) | ||
250 | break; | ||
251 | #endif | ||
252 | |||
253 | if (!(key_map = key_maps[s])) { | ||
254 | int j; | ||
255 | |||
256 | if (keymap_count >= MAX_NR_OF_USER_KEYMAPS && | ||
257 | !capable(CAP_SYS_RESOURCE)) | ||
258 | return -EPERM; | ||
259 | |||
260 | key_map = kmalloc(sizeof(plain_map), | ||
261 | GFP_KERNEL); | ||
262 | if (!key_map) | ||
263 | return -ENOMEM; | ||
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); | ||
268 | keymap_count++; | ||
269 | } | ||
270 | ov = U(key_map[i]); | ||
271 | if (v == ov) | ||
272 | break; /* nothing to do */ | ||
273 | /* | ||
274 | * Attention Key. | ||
275 | */ | ||
276 | if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN)) | ||
277 | return -EPERM; | ||
278 | key_map[i] = U(v); | ||
279 | if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT)) | ||
280 | compute_shiftstate(); | ||
281 | break; | ||
282 | } | ||
283 | return 0; | ||
284 | } | ||
285 | #undef i | ||
286 | #undef s | ||
287 | #undef v | ||
288 | |||
289 | static inline int | ||
290 | do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm) | ||
291 | { | ||
292 | struct kbkeycode tmp; | ||
293 | int kc = 0; | ||
294 | |||
295 | if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode))) | ||
296 | return -EFAULT; | ||
297 | switch (cmd) { | ||
298 | case KDGETKEYCODE: | ||
299 | kc = getkeycode(tmp.scancode); | ||
300 | if (kc >= 0) | ||
301 | kc = put_user(kc, &user_kbkc->keycode); | ||
302 | break; | ||
303 | case KDSETKEYCODE: | ||
304 | if (!perm) | ||
305 | return -EPERM; | ||
306 | kc = setkeycode(tmp.scancode, tmp.keycode); | ||
307 | break; | ||
308 | } | ||
309 | return kc; | ||
310 | } | ||
311 | |||
312 | static inline int | ||
313 | do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) | ||
314 | { | ||
315 | struct kbsentry *kbs; | ||
316 | char *p; | ||
317 | u_char *q; | ||
318 | u_char __user *up; | ||
319 | int sz; | ||
320 | int delta; | ||
321 | char *first_free, *fj, *fnw; | ||
322 | int i, j, k; | ||
323 | int ret; | ||
324 | |||
325 | if (!capable(CAP_SYS_TTY_CONFIG)) | ||
326 | perm = 0; | ||
327 | |||
328 | kbs = kmalloc(sizeof(*kbs), GFP_KERNEL); | ||
329 | if (!kbs) { | ||
330 | ret = -ENOMEM; | ||
331 | goto reterr; | ||
332 | } | ||
333 | |||
334 | /* we mostly copy too much here (512bytes), but who cares ;) */ | ||
335 | if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) { | ||
336 | ret = -EFAULT; | ||
337 | goto reterr; | ||
338 | } | ||
339 | kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0'; | ||
340 | i = kbs->kb_func; | ||
341 | |||
342 | switch (cmd) { | ||
343 | case KDGKBSENT: | ||
344 | sz = sizeof(kbs->kb_string) - 1; /* sz should have been | ||
345 | a struct member */ | ||
346 | up = user_kdgkb->kb_string; | ||
347 | p = func_table[i]; | ||
348 | if(p) | ||
349 | for ( ; *p && sz; p++, sz--) | ||
350 | if (put_user(*p, up++)) { | ||
351 | ret = -EFAULT; | ||
352 | goto reterr; | ||
353 | } | ||
354 | if (put_user('\0', up)) { | ||
355 | ret = -EFAULT; | ||
356 | goto reterr; | ||
357 | } | ||
358 | kfree(kbs); | ||
359 | return ((p && *p) ? -EOVERFLOW : 0); | ||
360 | case KDSKBSENT: | ||
361 | if (!perm) { | ||
362 | ret = -EPERM; | ||
363 | goto reterr; | ||
364 | } | ||
365 | |||
366 | q = func_table[i]; | ||
367 | first_free = funcbufptr + (funcbufsize - funcbufleft); | ||
368 | for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++) | ||
369 | ; | ||
370 | if (j < MAX_NR_FUNC) | ||
371 | fj = func_table[j]; | ||
372 | else | ||
373 | fj = first_free; | ||
374 | |||
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++) | ||
380 | if (func_table[k]) | ||
381 | func_table[k] += delta; | ||
382 | } | ||
383 | if (!q) | ||
384 | func_table[i] = fj; | ||
385 | funcbufleft -= delta; | ||
386 | } else { /* allocate a larger buffer */ | ||
387 | sz = 256; | ||
388 | while (sz < funcbufsize - funcbufleft + delta) | ||
389 | sz <<= 1; | ||
390 | fnw = kmalloc(sz, GFP_KERNEL); | ||
391 | if(!fnw) { | ||
392 | ret = -ENOMEM; | ||
393 | goto reterr; | ||
394 | } | ||
395 | |||
396 | if (!q) | ||
397 | func_table[i] = fj; | ||
398 | if (fj > funcbufptr) | ||
399 | memmove(fnw, funcbufptr, fj - funcbufptr); | ||
400 | for (k = 0; k < j; k++) | ||
401 | if (func_table[k]) | ||
402 | func_table[k] = fnw + (func_table[k] - funcbufptr); | ||
403 | |||
404 | if (first_free > fj) { | ||
405 | memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj); | ||
406 | for (k = j; k < MAX_NR_FUNC; k++) | ||
407 | if (func_table[k]) | ||
408 | func_table[k] = fnw + (func_table[k] - funcbufptr) + delta; | ||
409 | } | ||
410 | if (funcbufptr != func_buf) | ||
411 | kfree(funcbufptr); | ||
412 | funcbufptr = fnw; | ||
413 | funcbufleft = funcbufleft - delta + sz - funcbufsize; | ||
414 | funcbufsize = sz; | ||
415 | } | ||
416 | strcpy(func_table[i], kbs->kb_string); | ||
417 | break; | ||
418 | } | ||
419 | ret = 0; | ||
420 | reterr: | ||
421 | kfree(kbs); | ||
422 | return ret; | ||
423 | } | ||
424 | |||
425 | static inline int | ||
426 | do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op) | ||
427 | { | ||
428 | struct consolefontdesc cfdarg; | ||
429 | int i; | ||
430 | |||
431 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) | ||
432 | return -EFAULT; | ||
433 | |||
434 | switch (cmd) { | ||
435 | case PIO_FONTX: | ||
436 | if (!perm) | ||
437 | return -EPERM; | ||
438 | op->op = KD_FONT_OP_SET; | ||
439 | op->flags = KD_FONT_FLAG_OLD; | ||
440 | op->width = 8; | ||
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); | ||
445 | case GIO_FONTX: { | ||
446 | op->op = KD_FONT_OP_GET; | ||
447 | op->flags = KD_FONT_FLAG_OLD; | ||
448 | op->width = 8; | ||
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); | ||
453 | if (i) | ||
454 | return i; | ||
455 | cfdarg.charheight = op->height; | ||
456 | cfdarg.charcount = op->charcount; | ||
457 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc))) | ||
458 | return -EFAULT; | ||
459 | return 0; | ||
460 | } | ||
461 | } | ||
462 | return -EINVAL; | ||
463 | } | ||
464 | |||
465 | static inline int | ||
466 | do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc) | ||
467 | { | ||
468 | struct unimapdesc tmp; | ||
469 | |||
470 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | ||
471 | return -EFAULT; | ||
472 | if (tmp.entries) | ||
473 | if (!access_ok(VERIFY_WRITE, tmp.entries, | ||
474 | tmp.entry_ct*sizeof(struct unipair))) | ||
475 | return -EFAULT; | ||
476 | switch (cmd) { | ||
477 | case PIO_UNIMAP: | ||
478 | if (!perm) | ||
479 | return -EPERM; | ||
480 | return con_set_unimap(vc, tmp.entry_ct, tmp.entries); | ||
481 | case GIO_UNIMAP: | ||
482 | if (!perm && fg_console != vc->vc_num) | ||
483 | return -EPERM; | ||
484 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries); | ||
485 | } | ||
486 | return 0; | ||
487 | } | ||
488 | |||
489 | |||
490 | |||
491 | /* | ||
492 | * We handle the console-specific ioctl's here. We allow the | ||
493 | * capability to modify any console, not just the fg_console. | ||
494 | */ | ||
495 | int vt_ioctl(struct tty_struct *tty, | ||
496 | unsigned int cmd, unsigned long arg) | ||
497 | { | ||
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; | ||
502 | unsigned char ucval; | ||
503 | unsigned int uival; | ||
504 | void __user *up = (void __user *)arg; | ||
505 | int i, perm; | ||
506 | int ret = 0; | ||
507 | |||
508 | console = vc->vc_num; | ||
509 | |||
510 | tty_lock(); | ||
511 | |||
512 | if (!vc_cons_allocated(console)) { /* impossible? */ | ||
513 | ret = -ENOIOCTLCMD; | ||
514 | goto out; | ||
515 | } | ||
516 | |||
517 | |||
518 | /* | ||
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. | ||
521 | */ | ||
522 | perm = 0; | ||
523 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | ||
524 | perm = 1; | ||
525 | |||
526 | kbd = kbd_table + console; | ||
527 | switch (cmd) { | ||
528 | case TIOCLINUX: | ||
529 | ret = tioclinux(tty, arg); | ||
530 | break; | ||
531 | case KIOCSOUND: | ||
532 | if (!perm) | ||
533 | goto eperm; | ||
534 | /* | ||
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 | ||
538 | * change. | ||
539 | */ | ||
540 | if (arg) | ||
541 | arg = PIT_TICK_RATE / arg; | ||
542 | kd_mksound(arg, 0); | ||
543 | break; | ||
544 | |||
545 | case KDMKTONE: | ||
546 | if (!perm) | ||
547 | goto eperm; | ||
548 | { | ||
549 | unsigned int ticks, count; | ||
550 | |||
551 | /* | ||
552 | * Generate the tone for the appropriate number of ticks. | ||
553 | * If the time is zero, turn off sound ourselves. | ||
554 | */ | ||
555 | ticks = HZ * ((arg >> 16) & 0xffff) / 1000; | ||
556 | count = ticks ? (arg & 0xffff) : 0; | ||
557 | if (count) | ||
558 | count = PIT_TICK_RATE / count; | ||
559 | kd_mksound(count, ticks); | ||
560 | break; | ||
561 | } | ||
562 | |||
563 | case KDGKBTYPE: | ||
564 | /* | ||
565 | * this is naive. | ||
566 | */ | ||
567 | ucval = KB_101; | ||
568 | goto setchar; | ||
569 | |||
570 | /* | ||
571 | * These cannot be implemented on any machine that implements | ||
572 | * ioperm() in user level (such as Alpha PCs) or not at all. | ||
573 | * | ||
574 | * XXX: you should never use these, just call ioperm directly.. | ||
575 | */ | ||
576 | #ifdef CONFIG_X86 | ||
577 | case KDADDIO: | ||
578 | case KDDELIO: | ||
579 | /* | ||
580 | * KDADDIO and KDDELIO may be able to add ports beyond what | ||
581 | * we reject here, but to be safe... | ||
582 | */ | ||
583 | if (arg < GPFIRST || arg > GPLAST) { | ||
584 | ret = -EINVAL; | ||
585 | break; | ||
586 | } | ||
587 | ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; | ||
588 | break; | ||
589 | |||
590 | case KDENABIO: | ||
591 | case KDDISABIO: | ||
592 | ret = sys_ioperm(GPFIRST, GPNUM, | ||
593 | (cmd == KDENABIO)) ? -ENXIO : 0; | ||
594 | break; | ||
595 | #endif | ||
596 | |||
597 | /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ | ||
598 | |||
599 | case KDKBDREP: | ||
600 | { | ||
601 | struct kbd_repeat kbrep; | ||
602 | |||
603 | if (!capable(CAP_SYS_TTY_CONFIG)) | ||
604 | goto eperm; | ||
605 | |||
606 | if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) { | ||
607 | ret = -EFAULT; | ||
608 | break; | ||
609 | } | ||
610 | ret = kbd_rate(&kbrep); | ||
611 | if (ret) | ||
612 | break; | ||
613 | if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) | ||
614 | ret = -EFAULT; | ||
615 | break; | ||
616 | } | ||
617 | |||
618 | case KDSETMODE: | ||
619 | /* | ||
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... | ||
623 | * | ||
624 | * XXX It should at least call into the driver, fbdev's definitely | ||
625 | * need to restore their engine state. --BenH | ||
626 | */ | ||
627 | if (!perm) | ||
628 | goto eperm; | ||
629 | switch (arg) { | ||
630 | case KD_GRAPHICS: | ||
631 | break; | ||
632 | case KD_TEXT0: | ||
633 | case KD_TEXT1: | ||
634 | arg = KD_TEXT; | ||
635 | case KD_TEXT: | ||
636 | break; | ||
637 | default: | ||
638 | ret = -EINVAL; | ||
639 | goto out; | ||
640 | } | ||
641 | if (vc->vc_mode == (unsigned char) arg) | ||
642 | break; | ||
643 | vc->vc_mode = (unsigned char) arg; | ||
644 | if (console != fg_console) | ||
645 | break; | ||
646 | /* | ||
647 | * explicitly blank/unblank the screen if switching modes | ||
648 | */ | ||
649 | console_lock(); | ||
650 | if (arg == KD_TEXT) | ||
651 | do_unblank_screen(1); | ||
652 | else | ||
653 | do_blank_screen(1); | ||
654 | console_unlock(); | ||
655 | break; | ||
656 | |||
657 | case KDGETMODE: | ||
658 | uival = vc->vc_mode; | ||
659 | goto setint; | ||
660 | |||
661 | case KDMAPDISP: | ||
662 | case KDUNMAPDISP: | ||
663 | /* | ||
664 | * these work like a combination of mmap and KDENABIO. | ||
665 | * this could be easily finished. | ||
666 | */ | ||
667 | ret = -EINVAL; | ||
668 | break; | ||
669 | |||
670 | case KDSKBMODE: | ||
671 | if (!perm) | ||
672 | goto eperm; | ||
673 | switch(arg) { | ||
674 | case K_RAW: | ||
675 | kbd->kbdmode = VC_RAW; | ||
676 | break; | ||
677 | case K_MEDIUMRAW: | ||
678 | kbd->kbdmode = VC_MEDIUMRAW; | ||
679 | break; | ||
680 | case K_XLATE: | ||
681 | kbd->kbdmode = VC_XLATE; | ||
682 | compute_shiftstate(); | ||
683 | break; | ||
684 | case K_UNICODE: | ||
685 | kbd->kbdmode = VC_UNICODE; | ||
686 | compute_shiftstate(); | ||
687 | break; | ||
688 | case K_OFF: | ||
689 | kbd->kbdmode = VC_OFF; | ||
690 | break; | ||
691 | default: | ||
692 | ret = -EINVAL; | ||
693 | goto out; | ||
694 | } | ||
695 | tty_ldisc_flush(tty); | ||
696 | break; | ||
697 | |||
698 | case KDGKBMODE: | ||
699 | switch (kbd->kbdmode) { | ||
700 | case VC_RAW: | ||
701 | uival = K_RAW; | ||
702 | break; | ||
703 | case VC_MEDIUMRAW: | ||
704 | uival = K_MEDIUMRAW; | ||
705 | break; | ||
706 | case VC_UNICODE: | ||
707 | uival = K_UNICODE; | ||
708 | break; | ||
709 | case VC_OFF: | ||
710 | uival = K_OFF; | ||
711 | break; | ||
712 | default: | ||
713 | uival = K_XLATE; | ||
714 | break; | ||
715 | } | ||
716 | goto setint; | ||
717 | |||
718 | /* this could be folded into KDSKBMODE, but for compatibility | ||
719 | reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ | ||
720 | case KDSKBMETA: | ||
721 | switch(arg) { | ||
722 | case K_METABIT: | ||
723 | clr_vc_kbd_mode(kbd, VC_META); | ||
724 | break; | ||
725 | case K_ESCPREFIX: | ||
726 | set_vc_kbd_mode(kbd, VC_META); | ||
727 | break; | ||
728 | default: | ||
729 | ret = -EINVAL; | ||
730 | } | ||
731 | break; | ||
732 | |||
733 | case KDGKBMETA: | ||
734 | uival = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT); | ||
735 | setint: | ||
736 | ret = put_user(uival, (int __user *)arg); | ||
737 | break; | ||
738 | |||
739 | case KDGETKEYCODE: | ||
740 | case KDSETKEYCODE: | ||
741 | if(!capable(CAP_SYS_TTY_CONFIG)) | ||
742 | perm = 0; | ||
743 | ret = do_kbkeycode_ioctl(cmd, up, perm); | ||
744 | break; | ||
745 | |||
746 | case KDGKBENT: | ||
747 | case KDSKBENT: | ||
748 | ret = do_kdsk_ioctl(cmd, up, perm, kbd); | ||
749 | break; | ||
750 | |||
751 | case KDGKBSENT: | ||
752 | case KDSKBSENT: | ||
753 | ret = do_kdgkb_ioctl(cmd, up, perm); | ||
754 | break; | ||
755 | |||
756 | case KDGKBDIACR: | ||
757 | { | ||
758 | struct kbdiacrs __user *a = up; | ||
759 | struct kbdiacr diacr; | ||
760 | int i; | ||
761 | |||
762 | if (put_user(accent_table_size, &a->kb_cnt)) { | ||
763 | ret = -EFAULT; | ||
764 | break; | ||
765 | } | ||
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))) { | ||
771 | ret = -EFAULT; | ||
772 | break; | ||
773 | } | ||
774 | } | ||
775 | break; | ||
776 | } | ||
777 | case KDGKBDIACRUC: | ||
778 | { | ||
779 | struct kbdiacrsuc __user *a = up; | ||
780 | |||
781 | if (put_user(accent_table_size, &a->kb_cnt)) | ||
782 | ret = -EFAULT; | ||
783 | else if (copy_to_user(a->kbdiacruc, accent_table, | ||
784 | accent_table_size*sizeof(struct kbdiacruc))) | ||
785 | ret = -EFAULT; | ||
786 | break; | ||
787 | } | ||
788 | |||
789 | case KDSKBDIACR: | ||
790 | { | ||
791 | struct kbdiacrs __user *a = up; | ||
792 | struct kbdiacr diacr; | ||
793 | unsigned int ct; | ||
794 | int i; | ||
795 | |||
796 | if (!perm) | ||
797 | goto eperm; | ||
798 | if (get_user(ct,&a->kb_cnt)) { | ||
799 | ret = -EFAULT; | ||
800 | break; | ||
801 | } | ||
802 | if (ct >= MAX_DIACR) { | ||
803 | ret = -EINVAL; | ||
804 | break; | ||
805 | } | ||
806 | accent_table_size = ct; | ||
807 | for (i = 0; i < ct; i++) { | ||
808 | if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) { | ||
809 | ret = -EFAULT; | ||
810 | break; | ||
811 | } | ||
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); | ||
815 | } | ||
816 | break; | ||
817 | } | ||
818 | |||
819 | case KDSKBDIACRUC: | ||
820 | { | ||
821 | struct kbdiacrsuc __user *a = up; | ||
822 | unsigned int ct; | ||
823 | |||
824 | if (!perm) | ||
825 | goto eperm; | ||
826 | if (get_user(ct,&a->kb_cnt)) { | ||
827 | ret = -EFAULT; | ||
828 | break; | ||
829 | } | ||
830 | if (ct >= MAX_DIACR) { | ||
831 | ret = -EINVAL; | ||
832 | break; | ||
833 | } | ||
834 | accent_table_size = ct; | ||
835 | if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc))) | ||
836 | ret = -EFAULT; | ||
837 | break; | ||
838 | } | ||
839 | |||
840 | /* the ioctls below read/set the flags usually shown in the leds */ | ||
841 | /* don't use them - they will go away without warning */ | ||
842 | case KDGKBLED: | ||
843 | ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4); | ||
844 | goto setchar; | ||
845 | |||
846 | case KDSKBLED: | ||
847 | if (!perm) | ||
848 | goto eperm; | ||
849 | if (arg & ~0x77) { | ||
850 | ret = -EINVAL; | ||
851 | break; | ||
852 | } | ||
853 | kbd->ledflagstate = (arg & 7); | ||
854 | kbd->default_ledflagstate = ((arg >> 4) & 7); | ||
855 | set_leds(); | ||
856 | break; | ||
857 | |||
858 | /* the ioctls below only set the lights, not the functions */ | ||
859 | /* for those, see KDGKBLED and KDSKBLED above */ | ||
860 | case KDGETLED: | ||
861 | ucval = getledstate(); | ||
862 | setchar: | ||
863 | ret = put_user(ucval, (char __user *)arg); | ||
864 | break; | ||
865 | |||
866 | case KDSETLED: | ||
867 | if (!perm) | ||
868 | goto eperm; | ||
869 | setledstate(kbd, arg); | ||
870 | break; | ||
871 | |||
872 | /* | ||
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). | ||
878 | */ | ||
879 | case KDSIGACCEPT: | ||
880 | { | ||
881 | if (!perm || !capable(CAP_KILL)) | ||
882 | goto eperm; | ||
883 | if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) | ||
884 | ret = -EINVAL; | ||
885 | else { | ||
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); | ||
891 | } | ||
892 | break; | ||
893 | } | ||
894 | |||
895 | case VT_SETMODE: | ||
896 | { | ||
897 | struct vt_mode tmp; | ||
898 | |||
899 | if (!perm) | ||
900 | goto eperm; | ||
901 | if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) { | ||
902 | ret = -EFAULT; | ||
903 | goto out; | ||
904 | } | ||
905 | if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) { | ||
906 | ret = -EINVAL; | ||
907 | goto out; | ||
908 | } | ||
909 | console_lock(); | ||
910 | vc->vt_mode = tmp; | ||
911 | /* the frsig is ignored, so we set it to 0 */ | ||
912 | vc->vt_mode.frsig = 0; | ||
913 | put_pid(vc->vt_pid); | ||
914 | vc->vt_pid = get_pid(task_pid(current)); | ||
915 | /* no switch is required -- saw@shade.msu.ru */ | ||
916 | vc->vt_newvt = -1; | ||
917 | console_unlock(); | ||
918 | break; | ||
919 | } | ||
920 | |||
921 | case VT_GETMODE: | ||
922 | { | ||
923 | struct vt_mode tmp; | ||
924 | int rc; | ||
925 | |||
926 | console_lock(); | ||
927 | memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); | ||
928 | console_unlock(); | ||
929 | |||
930 | rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); | ||
931 | if (rc) | ||
932 | ret = -EFAULT; | ||
933 | break; | ||
934 | } | ||
935 | |||
936 | /* | ||
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. | ||
940 | */ | ||
941 | case VT_GETSTATE: | ||
942 | { | ||
943 | struct vt_stat __user *vtstat = up; | ||
944 | unsigned short state, mask; | ||
945 | |||
946 | if (put_user(fg_console + 1, &vtstat->v_active)) | ||
947 | ret = -EFAULT; | ||
948 | else { | ||
949 | state = 1; /* /dev/tty0 is always open */ | ||
950 | for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; | ||
951 | ++i, mask <<= 1) | ||
952 | if (VT_IS_IN_USE(i)) | ||
953 | state |= mask; | ||
954 | ret = put_user(state, &vtstat->v_state); | ||
955 | } | ||
956 | break; | ||
957 | } | ||
958 | |||
959 | /* | ||
960 | * Returns the first available (non-opened) console. | ||
961 | */ | ||
962 | case VT_OPENQRY: | ||
963 | for (i = 0; i < MAX_NR_CONSOLES; ++i) | ||
964 | if (! VT_IS_IN_USE(i)) | ||
965 | break; | ||
966 | uival = i < MAX_NR_CONSOLES ? (i+1) : -1; | ||
967 | goto setint; | ||
968 | |||
969 | /* | ||
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). | ||
973 | */ | ||
974 | case VT_ACTIVATE: | ||
975 | if (!perm) | ||
976 | goto eperm; | ||
977 | if (arg == 0 || arg > MAX_NR_CONSOLES) | ||
978 | ret = -ENXIO; | ||
979 | else { | ||
980 | arg--; | ||
981 | console_lock(); | ||
982 | ret = vc_allocate(arg); | ||
983 | console_unlock(); | ||
984 | if (ret) | ||
985 | break; | ||
986 | set_console(arg); | ||
987 | } | ||
988 | break; | ||
989 | |||
990 | case VT_SETACTIVATE: | ||
991 | { | ||
992 | struct vt_setactivate vsa; | ||
993 | |||
994 | if (!perm) | ||
995 | goto eperm; | ||
996 | |||
997 | if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg, | ||
998 | sizeof(struct vt_setactivate))) { | ||
999 | ret = -EFAULT; | ||
1000 | goto out; | ||
1001 | } | ||
1002 | if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES) | ||
1003 | ret = -ENXIO; | ||
1004 | else { | ||
1005 | vsa.console--; | ||
1006 | console_lock(); | ||
1007 | ret = vc_allocate(vsa.console); | ||
1008 | if (ret == 0) { | ||
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)); | ||
1018 | } | ||
1019 | console_unlock(); | ||
1020 | if (ret) | ||
1021 | break; | ||
1022 | /* Commence switch and lock */ | ||
1023 | set_console(vsa.console); | ||
1024 | } | ||
1025 | break; | ||
1026 | } | ||
1027 | |||
1028 | /* | ||
1029 | * wait until the specified VT has been activated | ||
1030 | */ | ||
1031 | case VT_WAITACTIVE: | ||
1032 | if (!perm) | ||
1033 | goto eperm; | ||
1034 | if (arg == 0 || arg > MAX_NR_CONSOLES) | ||
1035 | ret = -ENXIO; | ||
1036 | else | ||
1037 | ret = vt_waitactive(arg); | ||
1038 | break; | ||
1039 | |||
1040 | /* | ||
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. | ||
1044 | * | ||
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 | ||
1049 | */ | ||
1050 | case VT_RELDISP: | ||
1051 | if (!perm) | ||
1052 | goto eperm; | ||
1053 | |||
1054 | if (vc->vt_mode.mode != VT_PROCESS) { | ||
1055 | ret = -EINVAL; | ||
1056 | break; | ||
1057 | } | ||
1058 | /* | ||
1059 | * Switching-from response | ||
1060 | */ | ||
1061 | console_lock(); | ||
1062 | if (vc->vt_newvt >= 0) { | ||
1063 | if (arg == 0) | ||
1064 | /* | ||
1065 | * Switch disallowed, so forget we were trying | ||
1066 | * to do it. | ||
1067 | */ | ||
1068 | vc->vt_newvt = -1; | ||
1069 | |||
1070 | else { | ||
1071 | /* | ||
1072 | * The current vt has been released, so | ||
1073 | * complete the switch. | ||
1074 | */ | ||
1075 | int newvt; | ||
1076 | newvt = vc->vt_newvt; | ||
1077 | vc->vt_newvt = -1; | ||
1078 | ret = vc_allocate(newvt); | ||
1079 | if (ret) { | ||
1080 | console_unlock(); | ||
1081 | break; | ||
1082 | } | ||
1083 | /* | ||
1084 | * When we actually do the console switch, | ||
1085 | * make sure we are atomic with respect to | ||
1086 | * other console switches.. | ||
1087 | */ | ||
1088 | complete_change_console(vc_cons[newvt].d); | ||
1089 | } | ||
1090 | } else { | ||
1091 | /* | ||
1092 | * Switched-to response | ||
1093 | */ | ||
1094 | /* | ||
1095 | * If it's just an ACK, ignore it | ||
1096 | */ | ||
1097 | if (arg != VT_ACKACQ) | ||
1098 | ret = -EINVAL; | ||
1099 | } | ||
1100 | console_unlock(); | ||
1101 | break; | ||
1102 | |||
1103 | /* | ||
1104 | * Disallocate memory associated to VT (but leave VT1) | ||
1105 | */ | ||
1106 | case VT_DISALLOCATE: | ||
1107 | if (arg > MAX_NR_CONSOLES) { | ||
1108 | ret = -ENXIO; | ||
1109 | break; | ||
1110 | } | ||
1111 | if (arg == 0) { | ||
1112 | /* deallocate all unused consoles, but leave 0 */ | ||
1113 | console_lock(); | ||
1114 | for (i=1; i<MAX_NR_CONSOLES; i++) | ||
1115 | if (! VT_BUSY(i)) | ||
1116 | vc_deallocate(i); | ||
1117 | console_unlock(); | ||
1118 | } else { | ||
1119 | /* deallocate a single console, if possible */ | ||
1120 | arg--; | ||
1121 | if (VT_BUSY(arg)) | ||
1122 | ret = -EBUSY; | ||
1123 | else if (arg) { /* leave 0 */ | ||
1124 | console_lock(); | ||
1125 | vc_deallocate(arg); | ||
1126 | console_unlock(); | ||
1127 | } | ||
1128 | } | ||
1129 | break; | ||
1130 | |||
1131 | case VT_RESIZE: | ||
1132 | { | ||
1133 | struct vt_sizes __user *vtsizes = up; | ||
1134 | struct vc_data *vc; | ||
1135 | |||
1136 | ushort ll,cc; | ||
1137 | if (!perm) | ||
1138 | goto eperm; | ||
1139 | if (get_user(ll, &vtsizes->v_rows) || | ||
1140 | get_user(cc, &vtsizes->v_cols)) | ||
1141 | ret = -EFAULT; | ||
1142 | else { | ||
1143 | console_lock(); | ||
1144 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | ||
1145 | vc = vc_cons[i].d; | ||
1146 | |||
1147 | if (vc) { | ||
1148 | vc->vc_resize_user = 1; | ||
1149 | vc_resize(vc_cons[i].d, cc, ll); | ||
1150 | } | ||
1151 | } | ||
1152 | console_unlock(); | ||
1153 | } | ||
1154 | break; | ||
1155 | } | ||
1156 | |||
1157 | case VT_RESIZEX: | ||
1158 | { | ||
1159 | struct vt_consize __user *vtconsize = up; | ||
1160 | ushort ll,cc,vlin,clin,vcol,ccol; | ||
1161 | if (!perm) | ||
1162 | goto eperm; | ||
1163 | if (!access_ok(VERIFY_READ, vtconsize, | ||
1164 | sizeof(struct vt_consize))) { | ||
1165 | ret = -EFAULT; | ||
1166 | break; | ||
1167 | } | ||
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; | ||
1176 | if (clin) { | ||
1177 | if (ll) { | ||
1178 | if (ll != vlin/clin) { | ||
1179 | /* Parameters don't add up */ | ||
1180 | ret = -EINVAL; | ||
1181 | break; | ||
1182 | } | ||
1183 | } else | ||
1184 | ll = vlin/clin; | ||
1185 | } | ||
1186 | if (vcol && ccol) { | ||
1187 | if (cc) { | ||
1188 | if (cc != vcol/ccol) { | ||
1189 | ret = -EINVAL; | ||
1190 | break; | ||
1191 | } | ||
1192 | } else | ||
1193 | cc = vcol/ccol; | ||
1194 | } | ||
1195 | |||
1196 | if (clin > 32) { | ||
1197 | ret = -EINVAL; | ||
1198 | break; | ||
1199 | } | ||
1200 | |||
1201 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | ||
1202 | if (!vc_cons[i].d) | ||
1203 | continue; | ||
1204 | console_lock(); | ||
1205 | if (vlin) | ||
1206 | vc_cons[i].d->vc_scan_lines = vlin; | ||
1207 | if (clin) | ||
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); | ||
1211 | console_unlock(); | ||
1212 | } | ||
1213 | break; | ||
1214 | } | ||
1215 | |||
1216 | case PIO_FONT: { | ||
1217 | if (!perm) | ||
1218 | goto eperm; | ||
1219 | op.op = KD_FONT_OP_SET; | ||
1220 | op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */ | ||
1221 | op.width = 8; | ||
1222 | op.height = 0; | ||
1223 | op.charcount = 256; | ||
1224 | op.data = up; | ||
1225 | ret = con_font_op(vc_cons[fg_console].d, &op); | ||
1226 | break; | ||
1227 | } | ||
1228 | |||
1229 | case GIO_FONT: { | ||
1230 | op.op = KD_FONT_OP_GET; | ||
1231 | op.flags = KD_FONT_FLAG_OLD; | ||
1232 | op.width = 8; | ||
1233 | op.height = 32; | ||
1234 | op.charcount = 256; | ||
1235 | op.data = up; | ||
1236 | ret = con_font_op(vc_cons[fg_console].d, &op); | ||
1237 | break; | ||
1238 | } | ||
1239 | |||
1240 | case PIO_CMAP: | ||
1241 | if (!perm) | ||
1242 | ret = -EPERM; | ||
1243 | else | ||
1244 | ret = con_set_cmap(up); | ||
1245 | break; | ||
1246 | |||
1247 | case GIO_CMAP: | ||
1248 | ret = con_get_cmap(up); | ||
1249 | break; | ||
1250 | |||
1251 | case PIO_FONTX: | ||
1252 | case GIO_FONTX: | ||
1253 | ret = do_fontx_ioctl(cmd, up, perm, &op); | ||
1254 | break; | ||
1255 | |||
1256 | case PIO_FONTRESET: | ||
1257 | { | ||
1258 | if (!perm) | ||
1259 | goto eperm; | ||
1260 | |||
1261 | #ifdef BROKEN_GRAPHICS_PROGRAMS | ||
1262 | /* With BROKEN_GRAPHICS_PROGRAMS defined, the default | ||
1263 | font is not saved. */ | ||
1264 | ret = -ENOSYS; | ||
1265 | break; | ||
1266 | #else | ||
1267 | { | ||
1268 | op.op = KD_FONT_OP_SET_DEFAULT; | ||
1269 | op.data = NULL; | ||
1270 | ret = con_font_op(vc_cons[fg_console].d, &op); | ||
1271 | if (ret) | ||
1272 | break; | ||
1273 | con_set_default_unimap(vc_cons[fg_console].d); | ||
1274 | break; | ||
1275 | } | ||
1276 | #endif | ||
1277 | } | ||
1278 | |||
1279 | case KDFONTOP: { | ||
1280 | if (copy_from_user(&op, up, sizeof(op))) { | ||
1281 | ret = -EFAULT; | ||
1282 | break; | ||
1283 | } | ||
1284 | if (!perm && op.op != KD_FONT_OP_GET) | ||
1285 | goto eperm; | ||
1286 | ret = con_font_op(vc, &op); | ||
1287 | if (ret) | ||
1288 | break; | ||
1289 | if (copy_to_user(up, &op, sizeof(op))) | ||
1290 | ret = -EFAULT; | ||
1291 | break; | ||
1292 | } | ||
1293 | |||
1294 | case PIO_SCRNMAP: | ||
1295 | if (!perm) | ||
1296 | ret = -EPERM; | ||
1297 | else | ||
1298 | ret = con_set_trans_old(up); | ||
1299 | break; | ||
1300 | |||
1301 | case GIO_SCRNMAP: | ||
1302 | ret = con_get_trans_old(up); | ||
1303 | break; | ||
1304 | |||
1305 | case PIO_UNISCRNMAP: | ||
1306 | if (!perm) | ||
1307 | ret = -EPERM; | ||
1308 | else | ||
1309 | ret = con_set_trans_new(up); | ||
1310 | break; | ||
1311 | |||
1312 | case GIO_UNISCRNMAP: | ||
1313 | ret = con_get_trans_new(up); | ||
1314 | break; | ||
1315 | |||
1316 | case PIO_UNIMAPCLR: | ||
1317 | { struct unimapinit ui; | ||
1318 | if (!perm) | ||
1319 | goto eperm; | ||
1320 | ret = copy_from_user(&ui, up, sizeof(struct unimapinit)); | ||
1321 | if (ret) | ||
1322 | ret = -EFAULT; | ||
1323 | else | ||
1324 | con_clear_unimap(vc, &ui); | ||
1325 | break; | ||
1326 | } | ||
1327 | |||
1328 | case PIO_UNIMAP: | ||
1329 | case GIO_UNIMAP: | ||
1330 | ret = do_unimap_ioctl(cmd, up, perm, vc); | ||
1331 | break; | ||
1332 | |||
1333 | case VT_LOCKSWITCH: | ||
1334 | if (!capable(CAP_SYS_TTY_CONFIG)) | ||
1335 | goto eperm; | ||
1336 | vt_dont_switch = 1; | ||
1337 | break; | ||
1338 | case VT_UNLOCKSWITCH: | ||
1339 | if (!capable(CAP_SYS_TTY_CONFIG)) | ||
1340 | goto eperm; | ||
1341 | vt_dont_switch = 0; | ||
1342 | break; | ||
1343 | case VT_GETHIFONTMASK: | ||
1344 | ret = put_user(vc->vc_hi_font_mask, | ||
1345 | (unsigned short __user *)arg); | ||
1346 | break; | ||
1347 | case VT_WAITEVENT: | ||
1348 | ret = vt_event_wait_ioctl((struct vt_event __user *)arg); | ||
1349 | break; | ||
1350 | default: | ||
1351 | ret = -ENOIOCTLCMD; | ||
1352 | } | ||
1353 | out: | ||
1354 | tty_unlock(); | ||
1355 | return ret; | ||
1356 | eperm: | ||
1357 | ret = -EPERM; | ||
1358 | goto out; | ||
1359 | } | ||
1360 | |||
1361 | void reset_vc(struct vc_data *vc) | ||
1362 | { | ||
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); | ||
1371 | vc->vt_pid = NULL; | ||
1372 | vc->vt_newvt = -1; | ||
1373 | if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ | ||
1374 | reset_palette(vc); | ||
1375 | } | ||
1376 | |||
1377 | void vc_SAK(struct work_struct *work) | ||
1378 | { | ||
1379 | struct vc *vc_con = | ||
1380 | container_of(work, struct vc, SAK_work); | ||
1381 | struct vc_data *vc; | ||
1382 | struct tty_struct *tty; | ||
1383 | |||
1384 | console_lock(); | ||
1385 | vc = vc_con->d; | ||
1386 | if (vc) { | ||
1387 | tty = vc->port.tty; | ||
1388 | /* | ||
1389 | * SAK should also work in all raw modes and reset | ||
1390 | * them properly. | ||
1391 | */ | ||
1392 | if (tty) | ||
1393 | __do_SAK(tty); | ||
1394 | reset_vc(vc); | ||
1395 | } | ||
1396 | console_unlock(); | ||
1397 | } | ||
1398 | |||
1399 | #ifdef CONFIG_COMPAT | ||
1400 | |||
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 */ | ||
1405 | }; | ||
1406 | |||
1407 | static inline int | ||
1408 | compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd, | ||
1409 | int perm, struct console_font_op *op) | ||
1410 | { | ||
1411 | struct compat_consolefontdesc cfdarg; | ||
1412 | int i; | ||
1413 | |||
1414 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc))) | ||
1415 | return -EFAULT; | ||
1416 | |||
1417 | switch (cmd) { | ||
1418 | case PIO_FONTX: | ||
1419 | if (!perm) | ||
1420 | return -EPERM; | ||
1421 | op->op = KD_FONT_OP_SET; | ||
1422 | op->flags = KD_FONT_FLAG_OLD; | ||
1423 | op->width = 8; | ||
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); | ||
1428 | case GIO_FONTX: | ||
1429 | op->op = KD_FONT_OP_GET; | ||
1430 | op->flags = KD_FONT_FLAG_OLD; | ||
1431 | op->width = 8; | ||
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); | ||
1436 | if (i) | ||
1437 | return i; | ||
1438 | cfdarg.charheight = op->height; | ||
1439 | cfdarg.charcount = op->charcount; | ||
1440 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc))) | ||
1441 | return -EFAULT; | ||
1442 | return 0; | ||
1443 | } | ||
1444 | return -EINVAL; | ||
1445 | } | ||
1446 | |||
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 */ | ||
1453 | }; | ||
1454 | |||
1455 | static inline int | ||
1456 | compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop, | ||
1457 | int perm, struct console_font_op *op, struct vc_data *vc) | ||
1458 | { | ||
1459 | int i; | ||
1460 | |||
1461 | if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op))) | ||
1462 | return -EFAULT; | ||
1463 | if (!perm && op->op != KD_FONT_OP_GET) | ||
1464 | return -EPERM; | ||
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); | ||
1468 | if (i) | ||
1469 | return i; | ||
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))) | ||
1472 | return -EFAULT; | ||
1473 | return 0; | ||
1474 | } | ||
1475 | |||
1476 | struct compat_unimapdesc { | ||
1477 | unsigned short entry_ct; | ||
1478 | compat_caddr_t entries; | ||
1479 | }; | ||
1480 | |||
1481 | static inline int | ||
1482 | compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud, | ||
1483 | int perm, struct vc_data *vc) | ||
1484 | { | ||
1485 | struct compat_unimapdesc tmp; | ||
1486 | struct unipair __user *tmp_entries; | ||
1487 | |||
1488 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | ||
1489 | return -EFAULT; | ||
1490 | tmp_entries = compat_ptr(tmp.entries); | ||
1491 | if (tmp_entries) | ||
1492 | if (!access_ok(VERIFY_WRITE, tmp_entries, | ||
1493 | tmp.entry_ct*sizeof(struct unipair))) | ||
1494 | return -EFAULT; | ||
1495 | switch (cmd) { | ||
1496 | case PIO_UNIMAP: | ||
1497 | if (!perm) | ||
1498 | return -EPERM; | ||
1499 | return con_set_unimap(vc, tmp.entry_ct, tmp_entries); | ||
1500 | case GIO_UNIMAP: | ||
1501 | if (!perm && fg_console != vc->vc_num) | ||
1502 | return -EPERM; | ||
1503 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries); | ||
1504 | } | ||
1505 | return 0; | ||
1506 | } | ||
1507 | |||
1508 | long vt_compat_ioctl(struct tty_struct *tty, | ||
1509 | unsigned int cmd, unsigned long arg) | ||
1510 | { | ||
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; | ||
1515 | int perm; | ||
1516 | int ret = 0; | ||
1517 | |||
1518 | console = vc->vc_num; | ||
1519 | |||
1520 | tty_lock(); | ||
1521 | |||
1522 | if (!vc_cons_allocated(console)) { /* impossible? */ | ||
1523 | ret = -ENOIOCTLCMD; | ||
1524 | goto out; | ||
1525 | } | ||
1526 | |||
1527 | /* | ||
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. | ||
1530 | */ | ||
1531 | perm = 0; | ||
1532 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | ||
1533 | perm = 1; | ||
1534 | |||
1535 | switch (cmd) { | ||
1536 | /* | ||
1537 | * these need special handlers for incompatible data structures | ||
1538 | */ | ||
1539 | case PIO_FONTX: | ||
1540 | case GIO_FONTX: | ||
1541 | ret = compat_fontx_ioctl(cmd, up, perm, &op); | ||
1542 | break; | ||
1543 | |||
1544 | case KDFONTOP: | ||
1545 | ret = compat_kdfontop_ioctl(up, perm, &op, vc); | ||
1546 | break; | ||
1547 | |||
1548 | case PIO_UNIMAP: | ||
1549 | case GIO_UNIMAP: | ||
1550 | ret = compat_unimap_ioctl(cmd, up, perm, vc); | ||
1551 | break; | ||
1552 | |||
1553 | /* | ||
1554 | * all these treat 'arg' as an integer | ||
1555 | */ | ||
1556 | case KIOCSOUND: | ||
1557 | case KDMKTONE: | ||
1558 | #ifdef CONFIG_X86 | ||
1559 | case KDADDIO: | ||
1560 | case KDDELIO: | ||
1561 | #endif | ||
1562 | case KDSETMODE: | ||
1563 | case KDMAPDISP: | ||
1564 | case KDUNMAPDISP: | ||
1565 | case KDSKBMODE: | ||
1566 | case KDSKBMETA: | ||
1567 | case KDSKBLED: | ||
1568 | case KDSETLED: | ||
1569 | case KDSIGACCEPT: | ||
1570 | case VT_ACTIVATE: | ||
1571 | case VT_WAITACTIVE: | ||
1572 | case VT_RELDISP: | ||
1573 | case VT_DISALLOCATE: | ||
1574 | case VT_RESIZE: | ||
1575 | case VT_RESIZEX: | ||
1576 | goto fallback; | ||
1577 | |||
1578 | /* | ||
1579 | * the rest has a compatible data structure behind arg, | ||
1580 | * but we have to convert it to a proper 64 bit pointer. | ||
1581 | */ | ||
1582 | default: | ||
1583 | arg = (unsigned long)compat_ptr(arg); | ||
1584 | goto fallback; | ||
1585 | } | ||
1586 | out: | ||
1587 | tty_unlock(); | ||
1588 | return ret; | ||
1589 | |||
1590 | fallback: | ||
1591 | tty_unlock(); | ||
1592 | return vt_ioctl(tty, cmd, arg); | ||
1593 | } | ||
1594 | |||
1595 | |||
1596 | #endif /* CONFIG_COMPAT */ | ||
1597 | |||
1598 | |||
1599 | /* | ||
1600 | * Performs the back end of a vt switch. Called under the console | ||
1601 | * semaphore. | ||
1602 | */ | ||
1603 | static void complete_change_console(struct vc_data *vc) | ||
1604 | { | ||
1605 | unsigned char old_vc_mode; | ||
1606 | int old = fg_console; | ||
1607 | |||
1608 | last_console = fg_console; | ||
1609 | |||
1610 | /* | ||
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. | ||
1614 | */ | ||
1615 | old_vc_mode = vc_cons[fg_console].d->vc_mode; | ||
1616 | switch_screen(vc); | ||
1617 | |||
1618 | /* | ||
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). | ||
1624 | * | ||
1625 | * To account for this we duplicate this code below only if the | ||
1626 | * controlling process is gone and we've called reset_vc. | ||
1627 | */ | ||
1628 | if (old_vc_mode != vc->vc_mode) { | ||
1629 | if (vc->vc_mode == KD_TEXT) | ||
1630 | do_unblank_screen(1); | ||
1631 | else | ||
1632 | do_blank_screen(1); | ||
1633 | } | ||
1634 | |||
1635 | /* | ||
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()) | ||
1639 | */ | ||
1640 | if (vc->vt_mode.mode == VT_PROCESS) { | ||
1641 | /* | ||
1642 | * Send the signal as privileged - kill_pid() will | ||
1643 | * tell us if the process has gone or something else | ||
1644 | * is awry | ||
1645 | */ | ||
1646 | if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { | ||
1647 | /* | ||
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. | ||
1655 | */ | ||
1656 | reset_vc(vc); | ||
1657 | |||
1658 | if (old_vc_mode != vc->vc_mode) { | ||
1659 | if (vc->vc_mode == KD_TEXT) | ||
1660 | do_unblank_screen(1); | ||
1661 | else | ||
1662 | do_blank_screen(1); | ||
1663 | } | ||
1664 | } | ||
1665 | } | ||
1666 | |||
1667 | /* | ||
1668 | * Wake anyone waiting for their VT to activate | ||
1669 | */ | ||
1670 | vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num); | ||
1671 | return; | ||
1672 | } | ||
1673 | |||
1674 | /* | ||
1675 | * Performs the front-end of a vt switch | ||
1676 | */ | ||
1677 | void change_console(struct vc_data *new_vc) | ||
1678 | { | ||
1679 | struct vc_data *vc; | ||
1680 | |||
1681 | if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) | ||
1682 | return; | ||
1683 | |||
1684 | /* | ||
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). | ||
1689 | * | ||
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. | ||
1698 | */ | ||
1699 | vc = vc_cons[fg_console].d; | ||
1700 | if (vc->vt_mode.mode == VT_PROCESS) { | ||
1701 | /* | ||
1702 | * Send the signal as privileged - kill_pid() will | ||
1703 | * tell us if the process has gone or something else | ||
1704 | * is awry. | ||
1705 | * | ||
1706 | * We need to set vt_newvt *before* sending the signal or we | ||
1707 | * have a race. | ||
1708 | */ | ||
1709 | vc->vt_newvt = new_vc->vc_num; | ||
1710 | if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { | ||
1711 | /* | ||
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. | ||
1715 | */ | ||
1716 | return; | ||
1717 | } | ||
1718 | |||
1719 | /* | ||
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. | ||
1727 | */ | ||
1728 | reset_vc(vc); | ||
1729 | |||
1730 | /* | ||
1731 | * Fall through to normal (VT_AUTO) handling of the switch... | ||
1732 | */ | ||
1733 | } | ||
1734 | |||
1735 | /* | ||
1736 | * Ignore all switches in KD_GRAPHICS+VT_AUTO mode | ||
1737 | */ | ||
1738 | if (vc->vc_mode == KD_GRAPHICS) | ||
1739 | return; | ||
1740 | |||
1741 | complete_change_console(new_vc); | ||
1742 | } | ||
1743 | |||
1744 | /* Perform a kernel triggered VT switch for suspend/resume */ | ||
1745 | |||
1746 | static int disable_vt_switch; | ||
1747 | |||
1748 | int vt_move_to_console(unsigned int vt, int alloc) | ||
1749 | { | ||
1750 | int prev; | ||
1751 | |||
1752 | console_lock(); | ||
1753 | /* Graphics mode - up to X */ | ||
1754 | if (disable_vt_switch) { | ||
1755 | console_unlock(); | ||
1756 | return 0; | ||
1757 | } | ||
1758 | prev = fg_console; | ||
1759 | |||
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. */ | ||
1763 | console_unlock(); | ||
1764 | return -ENOSPC; | ||
1765 | } | ||
1766 | |||
1767 | if (set_console(vt)) { | ||
1768 | /* | ||
1769 | * We're unable to switch to the SUSPEND_CONSOLE. | ||
1770 | * Let the calling function know so it can decide | ||
1771 | * what to do. | ||
1772 | */ | ||
1773 | console_unlock(); | ||
1774 | return -EIO; | ||
1775 | } | ||
1776 | console_unlock(); | ||
1777 | tty_lock(); | ||
1778 | if (vt_waitactive(vt + 1)) { | ||
1779 | pr_debug("Suspend: Can't switch VCs."); | ||
1780 | tty_unlock(); | ||
1781 | return -EINTR; | ||
1782 | } | ||
1783 | tty_unlock(); | ||
1784 | return prev; | ||
1785 | } | ||
1786 | |||
1787 | /* | ||
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'. | ||
1793 | */ | ||
1794 | void pm_set_vt_switch(int do_switch) | ||
1795 | { | ||
1796 | console_lock(); | ||
1797 | disable_vt_switch = !do_switch; | ||
1798 | console_unlock(); | ||
1799 | } | ||
1800 | EXPORT_SYMBOL(pm_set_vt_switch); | ||