Import of Linus's Linux 1.1.68

1 files changed, 781 insertions, 0 deletions

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
new file mode 100644
index 000000000..8abf51813
--- /dev/null
+++ b/drivers/char/vt.c
@@ -0,0 +1,781 @@
+/*
+ *  linux/drivers/char/vt.c
+ *
+ *  Copyright (C) 1992 obz under the linux copyright
+ *
+ *  Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
+ *  Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
+ */
+
+#include <linux/types.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>
+#include <linux/malloc.h>
+
+#include <asm/io.h>
+#include <asm/segment.h>
+
+#include "kbd_kern.h"
+#include "vt_kern.h"
+#include "diacr.h"
+
+extern struct tty_driver console_driver;
+
+#define VT_IS_IN_USE(i)	(console_driver.table[i] && console_driver.table[i]->count)
+
+/*
+ * 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..MAX_NR_CONSOLES (corresponding to
+ * ttys 0..MAX_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[MAX_NR_CONSOLES];
+
+asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on);
+
+extern int getkeycode(unsigned int scancode);
+extern int setkeycode(unsigned int scancode, unsigned int keycode);
+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);
+
+extern unsigned int keymap_count;
+
+/*
+ * 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)
+
+/*
+ * 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;
+}
+
+/*
+ * 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 i;
+	unsigned int console;
+	unsigned char ucval;
+	struct kbd_struct * kbd;
+	struct vt_struct *vt = (struct vt_struct *)tty->driver_data;
+
+	console = vt->vc_num;
+
+	if (!vc_cons_allocated(console)) 	/* impossible? */
+		return -ENOIOCTLCMD;
+
+	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;
+
+	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;
+
+	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
+		 */
+		if (arg == KD_TEXT)
+			unblank_screen();
+		else {
+			timer_active &= ~(1<<BLANK_TIMER);
+			blank_screen();
+		}
+		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:
+			kbd->kbdmode = VC_RAW;
+			break;
+		  case K_MEDIUMRAW:
+			kbd->kbdmode = VC_MEDIUMRAW;
+			break;
+		  case K_XLATE:
+			kbd->kbdmode = VC_XLATE;
+			compute_shiftstate();
+			break;
+		  case K_UNICODE:
+			kbd->kbdmode = VC_UNICODE;
+			compute_shiftstate();
+			break;
+		  default:
+			return -EINVAL;
+		}
+		if (tty->ldisc.flush_buffer)
+			tty->ldisc.flush_buffer(tty);
+		return 0;
+
+	case KDGKBMODE:
+		i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned long));
+		if (!i) {
+			ucval = ((kbd->kbdmode == VC_RAW) ? K_RAW :
+				 (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW :
+				 (kbd->kbdmode == VC_UNICODE) ? K_UNICODE :
+				 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 KDGETKEYCODE:
+	{
+		struct kbkeycode * const a = (struct kbkeycode *)arg;
+		unsigned int sc;
+		int kc;
+
+		i = verify_area(VERIFY_WRITE, (void *)a, sizeof(struct kbkeycode));
+		if (i)
+			return i;
+		sc = get_fs_long((int *) &a->scancode);
+		kc = getkeycode(sc);
+		if (kc < 0)
+			return kc;
+		put_fs_long(kc, (int *) &a->keycode);
+		return 0;
+	}
+
+	case KDSETKEYCODE:
+	{
+		struct kbkeycode * const a = (struct kbkeycode *)arg;
+		unsigned int sc, kc;
+
+		i = verify_area(VERIFY_READ, (void *)a, sizeof(struct kbkeycode));
+		if (i)
+			return i;
+		sc = get_fs_long((int *) &a->scancode);
+		kc = get_fs_long((int *) &a->keycode);
+		return setkeycode(sc, kc);
+	}
+
+	case KDGKBENT:
+	{
+		struct kbentry * const a = (struct kbentry *)arg;
+		ushort *key_map, val;
+		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)) >= MAX_NR_KEYMAPS)
+			return -EINVAL;
+		key_map = key_maps[s];
+		if (key_map) {
+		    val = U(key_map[i]);
+		    if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
+			val = K_HOLE;
+		} else
+		    val = (i ? K_HOLE : K_NOSUCHMAP);
+		put_fs_word(val, (short *) &a->kb_value);
+		return 0;
+	}
+
+	case KDSKBENT:
+	{
+		const struct kbentry * a = (struct kbentry *)arg;
+		ushort *key_map;
+		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)) >= MAX_NR_KEYMAPS)
+			return -EINVAL;
+		v = get_fs_word(&a->kb_value);
+		if (!i && v == K_NOSUCHMAP) {
+			/* disallocate map */
+			key_map = key_maps[s];
+			if (key_map) {
+			    key_maps[s] = 0;
+			    if (key_map[0] == U(K_ALLOCATED)) {
+				kfree_s(key_map, sizeof(plain_map));
+				keymap_count--;
+			    }
+			}
+			return 0;
+		}
+
+		if (KTYP(v) < NR_TYPES) {
+		    if (KVAL(v) > max_vals[KTYP(v)])
+			return -EINVAL;
+		} else
+		    if (kbd->kbdmode != VC_UNICODE)
+			return -EINVAL;
+
+		/* assignment to entry 0 only tests validity of args */
+		if (!i)
+			return 0;
+
+		if (!(key_map = key_maps[s])) {
+			if (keymap_count >= MAX_NR_OF_USER_KEYMAPS && !suser())
+				return -EPERM;
+
+			key_map = (ushort *) kmalloc(sizeof(plain_map),
+						     GFP_KERNEL);
+			if (!key_map)
+				return -ENOMEM;
+			key_maps[s] = key_map;
+			key_map[0] = U(K_ALLOCATED);
+			for (s = 1; s < NR_KEYS; s++)
+				key_map[s] = U(K_HOLE);
+			keymap_count++;
+		}
+		/*
+		 * Only the Superuser can set or unset the Secure
+		 * Attention Key.
+		 */
+		if (((key_map[i] == U(K_SAK)) || (v == K_SAK)) &&
+		    !suser())
+			return -EPERM;
+		key_map[i] = U(v);
+		return 0;
+	}
+
+	case KDGKBSENT:
+	{
+		struct kbsentry *a = (struct kbsentry *)arg;
+		char *p;
+		u_char *q;
+		int sz;
+
+		i = verify_area(VERIFY_WRITE, (void *)a, sizeof(struct kbsentry));
+		if (i)
+			return i;
+		if ((i = get_fs_byte(&a->kb_func)) >= MAX_NR_FUNC || i < 0)
+			return -EINVAL;
+		sz = sizeof(a->kb_string) - 1; /* sz should have been
+						  a struct member */
+		q = a->kb_string;
+		p = func_table[i];
+		if(p)
+			for ( ; *p && sz; p++, sz--)
+				put_fs_byte(*p, q++);
+		put_fs_byte(0, q);
+		return ((p && *p) ? -EOVERFLOW : 0);
+	}
+
+	case KDSKBSENT:
+	{
+		struct kbsentry * const a = (struct kbsentry *)arg;
+		int delta;
+		char *first_free, *fj, *fnw;
+		int j, k, sz;
+		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)) >= MAX_NR_FUNC)
+			return -EINVAL;
+		q = func_table[i];
+
+		first_free = funcbufptr + (funcbufsize - funcbufleft);
+		for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++) ;
+		if (j < MAX_NR_FUNC)
+			fj = func_table[j];
+		else
+			fj = first_free;
+
+		delta = (q ? -strlen(q) : 1);
+		sz = sizeof(a->kb_string); 	/* sz should have been
+						   a struct member */
+		for (p = a->kb_string; get_fs_byte(p) && sz; p++,sz--)
+			delta++;
+		if (!sz)
+			return -EOVERFLOW;
+		if (delta <= funcbufleft) { 	/* it fits in current buf */
+		    if (j < MAX_NR_FUNC) {
+			memmove(fj + delta, fj, first_free - fj);
+			for (k = j; k < MAX_NR_FUNC; k++)
+			    if (func_table[k])
+				func_table[k] += delta;
+		    }
+		    if (!q)
+		      func_table[i] = fj;
+		    funcbufleft -= delta;
+		} else {			/* allocate a larger buffer */
+		    sz = 256;
+		    while (sz < funcbufsize - funcbufleft + delta)
+		      sz <<= 1;
+		    fnw = (char *) kmalloc(sz, GFP_KERNEL);
+		    if(!fnw)
+		      return -ENOMEM;
+
+		    if (!q)
+		      func_table[i] = fj;
+		    if (fj > funcbufptr)
+			memmove(fnw, funcbufptr, fj - funcbufptr);
+		    for (k = 0; k < j; k++)
+		      if (func_table[k])
+			func_table[k] = fnw + (func_table[k] - funcbufptr);
+
+		    if (first_free > fj) {
+			memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
+			for (k = j; k < MAX_NR_FUNC; k++)
+			  if (func_table[k])
+			    func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
+		    }
+		    if (funcbufptr != func_buf)
+		      kfree_s(funcbufptr, funcbufsize);
+		    funcbufptr = fnw;
+		    funcbufleft = funcbufleft - delta + sz - funcbufsize;
+		    funcbufsize = sz;
+		}
+		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;
+	}
+
+	/* the ioctls below read/set the flags usually shown in the leds */
+	/* don't use them - they will go away without warning */
+	case KDGKBLED:
+		i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned char));
+		if (i)
+			return i;
+		put_fs_byte(kbd->ledflagstate |
+			    (kbd->default_ledflagstate << 4), (char *) arg);
+		return 0;
+
+	case KDSKBLED:
+		if (arg & ~0x77)
+			return -EINVAL;
+		kbd->ledflagstate = (arg & 7);
+		kbd->default_ledflagstate = ((arg >> 4) & 7);
+		set_leds();
+		return 0;
+
+	/* the ioctls below only set the lights, not the functions */
+	/* for those, see KDGKBLED and KDSKBLED above */
+	case KDGETLED:
+		i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned char));
+		if (i)
+			return i;
+		put_fs_byte(getledstate(), (char *) arg);
+		return 0;
+
+	case KDSETLED:
+		setledstate(kbd, arg);
+		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.
+	 * We cannot return state for more than 16 VTs, since v_state is short.
+	 */
+	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 = 0, mask = 2; i < MAX_NR_CONSOLES && mask; ++i, mask <<= 1)
+			if (console_driver.table[i] &&
+			    console_driver.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 = 0; i < MAX_NR_CONSOLES; ++i)
+			if (! VT_IS_IN_USE(i))
+				break;
+		put_fs_long(i < MAX_NR_CONSOLES ? (i+1) : -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 > MAX_NR_CONSOLES)
+			return -ENXIO;
+		arg--;
+		i = vc_allocate(arg);
+		if (i)
+			return i;
+		change_console(arg);
+		return 0;
+
+	/*
+	 * wait until the specified VT has been activated
+	 */
+	case VT_WAITACTIVE:
+		if (arg == 0 || arg > MAX_NR_CONSOLES)
+			return -ENXIO;
+		arg--;
+		while (fg_console != arg)
+		{
+			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;
+				i = vc_allocate(newvt);
+				if (i)
+					return i;
+				complete_change_console(newvt);
+			}
+		}
+
+		/*
+		 * Switched-to response
+		 */
+		else
+		{
+			/*
+			 * If it's just an ACK, ignore it
+			 */
+			if (arg != VT_ACKACQ)
+				return -EINVAL;
+		}
+
+		return 0;
+
+	 /*
+	  * Disallocate memory associated to VT (but leave VT1)
+	  */
+	 case VT_DISALLOCATE:
+		if (arg > MAX_NR_CONSOLES)
+			return -ENXIO;
+		if (arg == 0) {
+		    /* disallocate all unused consoles, but leave 0 */
+		    for (i=1; i<MAX_NR_CONSOLES; i++)
+		      if (! VT_IS_IN_USE(i)) {
+			  if (i == fg_console)
+			    change_console(0);
+			  vc_disallocate(i);
+		      }
+		} else {
+		    /* disallocate a single console, if possible */
+		    arg--;
+		    if (VT_IS_IN_USE(arg))
+		      return -EBUSY;
+		    if (arg) {			      /* leave 0 */
+			if (arg == fg_console)
+			  change_console(0);
+			vc_disallocate(arg);
+		    }
+		}
+		return 0;
+
+	case VT_RESIZE:
+	{
+		struct vt_sizes *vtsizes = (struct vt_sizes *) arg;
+		ushort ll,cc;
+		i = verify_area(VERIFY_READ, (void *)vtsizes, sizeof(struct vt_sizes));
+		if (i)
+			return i;
+		ll = get_fs_word(&vtsizes->v_rows);
+		cc = get_fs_word(&vtsizes->v_cols);
+		return vc_resize(ll, cc);
+	}
+
+	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 */
+
+	default:
+		return -ENOIOCTLCMD;
+	}
+}