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- /*
- * kernel/chr_drv/vt.c
- *
- * Copyright (C) 1992 obz under the linux copyright
- * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
- */
-
- #undef __pc_stuf__
-
- #include <linux/types.h>
- #include <linux/config.h>
- #include <linux/errno.h>
- #include <linux/sched.h>
- #include <linux/tty.h>
- #include <linux/timer.h>
- #include <linux/kernel.h>
- #include <linux/kd.h>
- #include <linux/vt.h>
- #include <linux/string.h>
-
- #ifdef __pc_stuff__
- #include <asm/io.h>
- #endif
- #include <asm/segment.h>
-
- #include "kbd_kern.h"
- #include "vt_kern.h"
- #include "diacr.h"
-
- /*
- * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
- * experimentation and study of X386 SYSV handling.
- *
- * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
- * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
- * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
- * always treat our set of vt as numbered 1..NR_CONSOLES (corresponding to
- * ttys 0..NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
- * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
- * to the current console is done by the main ioctl code.
- */
-
- struct vt_struct vt_cons[NR_CONSOLES];
-
- asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on);
-
- extern void compute_shiftstate(void);
- extern void change_console(unsigned int new_console);
- extern void complete_change_console(unsigned int new_console);
- extern int vt_waitactive(void);
-
- /*
- * routines to load custom translation table and EGA/VGA font from console.c
- */
- extern int con_set_trans(char * table);
- extern int con_get_trans(char * table);
- extern int con_set_font(char * fontmap);
- extern int con_get_font(char * fontmap);
-
- /*
- * these are the valid i/o ports we're allowed to change. they map all the
- * video ports
- */
- #define GPFIRST 0x3b4
- #define GPLAST 0x3df
- #define GPNUM (GPLAST - GPFIRST + 1)
-
- #ifdef __pc_stuff__
-
- /*
- * Generates sound of some count for some number of clock ticks
- * [count = 1193180 / frequency]
- *
- * If freq is 0, will turn off sound, else will turn it on for that time.
- * If msec is 0, will return immediately, else will sleep for msec time, then
- * turn sound off.
- *
- * We use the BEEP_TIMER vector since we're using the same method to
- * generate sound, and we'll overwrite any beep in progress. That may
- * be something to fix later, if we like.
- *
- * We also return immediately, which is what was implied within the X
- * comments - KDMKTONE doesn't put the process to sleep.
- */
- static void
- kd_nosound(unsigned long ignored)
- {
- /* disable counter 2 */
- outb(inb_p(0x61)&0xFC, 0x61);
- return;
- }
-
- void
- kd_mksound(unsigned int count, unsigned int ticks)
- {
- static struct timer_list sound_timer = { NULL, NULL, 0, 0, kd_nosound };
-
- cli();
- del_timer(&sound_timer);
- if (count) {
- /* enable counter 2 */
- outb_p(inb_p(0x61)|3, 0x61);
- /* set command for counter 2, 2 byte write */
- outb_p(0xB6, 0x43);
- /* select desired HZ */
- outb_p(count & 0xff, 0x42);
- outb((count >> 8) & 0xff, 0x42);
-
- if (ticks) {
- sound_timer.expires = ticks;
- add_timer(&sound_timer);
- }
- } else
- kd_nosound(0);
- sti();
- return;
- }
- #else
-
- static void
- kd_nosound(unsigned long ignored)
- {
- if (mach_mksound)
- mach_mksound( 0, 0 );
- }
-
- void
- kd_mksound(unsigned int count, unsigned int ticks)
- {
- if (mach_mksound)
- mach_mksound( count, ticks );
- }
-
- #endif
-
- /*
- * We handle the console-specific ioctl's here. We allow the
- * capability to modify any console, not just the fg_console.
- */
- int vt_ioctl(struct tty_struct *tty, struct file * file,
- unsigned int cmd, unsigned long arg)
- {
- int console, i;
- unsigned char ucval;
- struct kbd_struct * kbd;
-
- console = tty->line - 1;
-
- if (console < 0 || console >= NR_CONSOLES)
- return -EINVAL;
-
- kbd = kbd_table + console;
- switch (cmd) {
- case KIOCSOUND:
- kd_mksound((unsigned int)arg, 0);
- return 0;
-
- case KDMKTONE:
- {
- unsigned int ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
-
- /*
- * Generate the tone for the appropriate number of ticks.
- * If the time is zero, turn off sound ourselves.
- */
- kd_mksound(arg & 0xffff, ticks);
- if (ticks == 0)
- kd_nosound(0);
- return 0;
- }
-
- case KDGKBTYPE:
- /*
- * this is naive.
- */
- i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned char));
- if (!i)
- put_fs_byte(KB_101, (char *) arg);
- return i;
-
- #ifdef __pc_stuff__
- case KDADDIO:
- case KDDELIO:
- /*
- * KDADDIO and KDDELIO may be able to add ports beyond what
- * we reject here, but to be safe...
- */
- if (arg < GPFIRST || arg > GPLAST)
- return -EINVAL;
- return sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
-
- case KDENABIO:
- case KDDISABIO:
- return sys_ioperm(GPFIRST, GPNUM,
- (cmd == KDENABIO)) ? -ENXIO : 0;
- #endif
-
- case KDSETMODE:
- /*
- * currently, setting the mode from KD_TEXT to KD_GRAPHICS
- * doesn't do a whole lot. i'm not sure if it should do any
- * restoration of modes or what...
- */
- switch (arg) {
- case KD_GRAPHICS:
- break;
- case KD_TEXT0:
- case KD_TEXT1:
- arg = KD_TEXT;
- case KD_TEXT:
- break;
- default:
- return -EINVAL;
- }
- if (vt_cons[console].vc_mode == (unsigned char) arg)
- return 0;
- vt_cons[console].vc_mode = (unsigned char) arg;
- if (console != fg_console)
- return 0;
- /*
- * explicitly blank/unblank the screen if switching modes
- */
- #ifdef __notyet__
- if (arg == KD_TEXT)
- unblank_screen();
- else {
- timer_active &= ~(1<<BLANK_TIMER);
- blank_screen();
- }
- #endif
- return 0;
-
- case KDGETMODE:
- i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned long));
- if (!i)
- put_fs_long(vt_cons[console].vc_mode, (unsigned long *) arg);
- return i;
-
- case KDMAPDISP:
- case KDUNMAPDISP:
- /*
- * these work like a combination of mmap and KDENABIO.
- * this could be easily finished.
- */
- return -EINVAL;
-
- case KDSKBMODE:
- switch(arg) {
- case K_RAW:
- set_vc_kbd_mode(kbd, VC_RAW);
- clr_vc_kbd_mode(kbd, VC_MEDIUMRAW);
- break;
- case K_MEDIUMRAW:
- clr_vc_kbd_mode(kbd, VC_RAW);
- set_vc_kbd_mode(kbd, VC_MEDIUMRAW);
- break;
- case K_XLATE:
- clr_vc_kbd_mode(kbd, VC_RAW);
- clr_vc_kbd_mode(kbd, VC_MEDIUMRAW);
- compute_shiftstate();
- break;
- default:
- return -EINVAL;
- }
- flush_input(tty);
- return 0;
-
- case KDGKBMODE:
- i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned long));
- if (!i) {
- ucval = (vc_kbd_mode(kbd, VC_RAW) ? K_RAW :
- vc_kbd_mode(kbd, VC_MEDIUMRAW) ? K_MEDIUMRAW :
- K_XLATE);
- put_fs_long(ucval, (unsigned long *) arg);
- }
- return i;
-
- /* this could be folded into KDSKBMODE, but for compatibility
- reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
- case KDSKBMETA:
- switch(arg) {
- case K_METABIT:
- clr_vc_kbd_mode(kbd, VC_META);
- break;
- case K_ESCPREFIX:
- set_vc_kbd_mode(kbd, VC_META);
- break;
- default:
- return -EINVAL;
- }
- return 0;
-
- case KDGKBMETA:
- i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned long));
- if (!i) {
- ucval = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX :
- K_METABIT);
- put_fs_long(ucval, (unsigned long *) arg);
- }
- return i;
-
- case KDGKBENT:
- {
- struct kbentry * const a = (struct kbentry *)arg;
- u_char s;
-
- i = verify_area(VERIFY_WRITE, (void *)a, sizeof(struct kbentry));
- if (i)
- return i;
- if ((i = get_fs_byte((char *) &a->kb_index)) >= NR_KEYS)
- return -EINVAL;
- if ((s = get_fs_byte((char *) &a->kb_table)) >= NR_KEYMAPS)
- return -EINVAL;
- put_fs_word(key_map[s][i], (short *) &a->kb_value);
- return 0;
- }
-
- case KDSKBENT:
- {
- const struct kbentry * a = (struct kbentry *)arg;
- u_char s;
- u_short v;
-
- i = verify_area(VERIFY_READ, (void *)a, sizeof(struct kbentry));
- if (i)
- return i;
- if ((i = get_fs_byte((char *) &a->kb_index)) >= NR_KEYS)
- return -EINVAL;
- if ((s = get_fs_byte((char *) &a->kb_table)) >= NR_KEYMAPS)
- return -EINVAL;
- if (KTYP(v = get_fs_word(&a->kb_value)) >= NR_TYPES)
- return -EINVAL;
- if (KVAL(v) > max_vals[KTYP(v)])
- return -EINVAL;
- key_map[s][i] = v;
- return 0;
- }
-
- case KDGKBSENT:
- {
- struct kbsentry *a = (struct kbsentry *)arg;
- char *p;
- u_char *q;
-
- i = verify_area(VERIFY_WRITE, (void *)a, sizeof(struct kbsentry));
- if (i)
- return i;
- if ((i = get_fs_byte(&a->kb_func)) >= NR_FUNC || i < 0)
- return -EINVAL;
- q = a->kb_string;
- p = func_table[i];
- if(!p) {
- /* beware of tables generated for a smaller NR_FUNC */
- printk("KDGKBSENT error: func_table[%d] is nil.\n",
- i);
- return -EINVAL;
- }
- for ( ; *p; p++)
- put_fs_byte(*p, q++);
- put_fs_byte(0, q);
- return 0;
- }
-
- case KDSKBSENT:
- {
- struct kbsentry * const a = (struct kbsentry *)arg;
- int delta;
- char *first_free;
- int k;
- u_char *p;
- char *q;
-
- i = verify_area(VERIFY_READ, (void *)a, sizeof(struct kbsentry));
- if (i)
- return i;
- if ((i = get_fs_byte(&a->kb_func)) >= NR_FUNC)
- return -EINVAL;
- q = func_table[i];
- if (!q) {
- /* beware of tables generated for a smaller NR_FUNC */
- printk("KDSKBSENT error: func_table[%d] is nil.\n",
- i);
- return -EINVAL;
- }
- delta = -strlen(q);
- for (p = a->kb_string; get_fs_byte(p); p++)
- delta++;
- first_free = func_table[NR_FUNC - 1] +
- strlen(func_table[NR_FUNC - 1]) + 1;
- if (
- delta > 0 &&
- first_free + delta > func_buf + FUNC_BUFSIZE
- )
- return -EINVAL;
- if (i < NR_FUNC - 1) {
- memmove(
- func_table[i + 1] + delta,
- func_table[i + 1],
- first_free - func_table[i + 1]);
- for (k = i + 1; k < NR_FUNC; k++)
- if (func_table[k]) /* just to be sure */
- func_table[k] += delta;
- }
- for (p = a->kb_string, q = func_table[i]; ; p++, q++)
- if (!(*q = get_fs_byte(p)))
- break;
- return 0;
- }
-
- case KDGKBDIACR:
- {
- struct kbdiacrs *a = (struct kbdiacrs *)arg;
-
- i = verify_area(VERIFY_WRITE, (void *) a, sizeof(struct kbdiacrs));
- if (i)
- return i;
- put_fs_long(accent_table_size, &a->kb_cnt);
- memcpy_tofs(a->kbdiacr, accent_table,
- accent_table_size*sizeof(struct kbdiacr));
- return 0;
- }
-
- case KDSKBDIACR:
- {
- struct kbdiacrs *a = (struct kbdiacrs *)arg;
- unsigned int ct;
-
- i = verify_area(VERIFY_READ, (void *) a, sizeof(struct kbdiacrs));
- if (i)
- return i;
- ct = get_fs_long(&a->kb_cnt);
- if (ct >= MAX_DIACR)
- return -EINVAL;
- accent_table_size = ct;
- memcpy_fromfs(accent_table, a->kbdiacr, ct*sizeof(struct kbdiacr));
- return 0;
- }
-
- case KDGETLED:
- i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned char));
- if (i)
- return i;
- put_fs_byte(kbd->ledstate, (char *) arg);
- return 0;
-
- case KDSETLED:
- if (arg & ~7)
- return -EINVAL;
- kbd->ledstate = arg;
- #ifdef __pc_stuff__
- set_leds();
- #endif
- return 0;
-
- case VT_SETMODE:
- {
- struct vt_mode *vtmode = (struct vt_mode *)arg;
- char mode;
-
- i = verify_area(VERIFY_WRITE, (void *)vtmode, sizeof(struct vt_mode));
- if (i)
- return i;
- mode = get_fs_byte(&vtmode->mode);
- if (mode != VT_AUTO && mode != VT_PROCESS)
- return -EINVAL;
- vt_cons[console].vt_mode.mode = mode;
- vt_cons[console].vt_mode.waitv = get_fs_byte(&vtmode->waitv);
- vt_cons[console].vt_mode.relsig = get_fs_word(&vtmode->relsig);
- vt_cons[console].vt_mode.acqsig = get_fs_word(&vtmode->acqsig);
- /* the frsig is ignored, so we set it to 0 */
- vt_cons[console].vt_mode.frsig = 0;
- vt_cons[console].vt_pid = current->pid;
- vt_cons[console].vt_newvt = 0;
- return 0;
- }
-
- case VT_GETMODE:
- {
- struct vt_mode *vtmode = (struct vt_mode *)arg;
-
- i = verify_area(VERIFY_WRITE, (void *)arg, sizeof(struct vt_mode));
- if (i)
- return i;
- put_fs_byte(vt_cons[console].vt_mode.mode, &vtmode->mode);
- put_fs_byte(vt_cons[console].vt_mode.waitv, &vtmode->waitv);
- put_fs_word(vt_cons[console].vt_mode.relsig, &vtmode->relsig);
- put_fs_word(vt_cons[console].vt_mode.acqsig, &vtmode->acqsig);
- put_fs_word(vt_cons[console].vt_mode.frsig, &vtmode->frsig);
- return 0;
- }
-
- /*
- * Returns global vt state. Note that VT 0 is always open, since
- * it's an alias for the current VT, and people can't use it here.
- */
- case VT_GETSTATE:
- {
- struct vt_stat *vtstat = (struct vt_stat *)arg;
- unsigned short state, mask;
-
- i = verify_area(VERIFY_WRITE,(void *)vtstat, sizeof(struct vt_stat));
- if (i)
- return i;
- put_fs_word(fg_console + 1, &vtstat->v_active);
- state = 1; /* /dev/tty0 is always open */
- for (i = 1, mask = 2; i <= NR_CONSOLES; ++i, mask <<= 1)
- if (tty_table[i] && tty_table[i]->count > 0)
- state |= mask;
- put_fs_word(state, &vtstat->v_state);
- return 0;
- }
-
- /*
- * Returns the first available (non-opened) console.
- */
- case VT_OPENQRY:
- i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(long));
- if (i)
- return i;
- for (i = 1; i <= NR_CONSOLES; ++i)
- if (!tty_table[i] || tty_table[i]->count == 0)
- break;
- put_fs_long(i <= NR_CONSOLES ? i : -1, (unsigned long *)arg);
- return 0;
-
- /*
- * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
- * with num >= 1 (switches to vt 0, our console) are not allowed, just
- * to preserve sanity.
- */
- case VT_ACTIVATE:
- if (arg == 0 || arg > NR_CONSOLES)
- return -ENXIO;
- #ifdef __notyet__
- change_console(arg - 1);
- #endif
- return 0;
-
- /*
- * wait until the specified VT has been activated
- */
- case VT_WAITACTIVE:
- if (arg == 0 || arg > NR_CONSOLES)
- return -ENXIO;
- while (fg_console != arg - 1)
- {
- if (vt_waitactive() < 0)
- return -EINTR;
- }
- return 0;
-
- /*
- * If a vt is under process control, the kernel will not switch to it
- * immediately, but postpone the operation until the process calls this
- * ioctl, allowing the switch to complete.
- *
- * According to the X sources this is the behavior:
- * 0: pending switch-from not OK
- * 1: pending switch-from OK
- * 2: completed switch-to OK
- */
- case VT_RELDISP:
- if (vt_cons[console].vt_mode.mode != VT_PROCESS)
- return -EINVAL;
-
- /*
- * Switching-from response
- */
- if (vt_cons[console].vt_newvt >= 0)
- {
- if (arg == 0)
- /*
- * Switch disallowed, so forget we were trying
- * to do it.
- */
- vt_cons[console].vt_newvt = -1;
-
- else
- {
- /*
- * The current vt has been released, so
- * complete the switch.
- */
- int newvt = vt_cons[console].vt_newvt;
- vt_cons[console].vt_newvt = -1;
- complete_change_console(newvt);
- }
- }
-
- /*
- * Switched-to response
- */
- else
- {
- /*
- * If it's just an ACK, ignore it
- */
- if (arg != VT_ACKACQ)
- return -EINVAL;
- }
-
- return 0;
-
- #ifdef __notyet__
- case PIO_FONT:
- return con_set_font((char *)arg);
- /* con_set_font() defined in console.c */
-
- case GIO_FONT:
- return con_get_font((char *)arg);
- /* con_get_font() defined in console.c */
-
- case PIO_SCRNMAP:
- return con_set_trans((char *)arg);
- /* con_set_trans() defined in console.c */
-
- case GIO_SCRNMAP:
- return con_get_trans((char *)arg);
- /* con_get_trans() defined in console.c */
- #endif
-
- default:
- return -EINVAL;
- }
- }
-