Ejemplo n.º 1
0
static int vesa_probe(void)
{
#if defined(CONFIG_VIDEO_VESA) || defined(CONFIG_FIRMWARE_EDID)
	u16 ax, cx, di;
	u16 mode;
	addr_t mode_ptr;
	struct mode_info *mi;
	int nmodes = 0;

	video_vesa.modes = GET_HEAP(struct mode_info, 0);

	ax = 0x4f00;
	di = (size_t)&vginfo;
	asm(INT10
	    : "+a" (ax), "+D" (di), "=m" (vginfo)
	    : : "ebx", "ecx", "edx", "esi");

	if (ax != 0x004f ||
	    vginfo.signature != VESA_MAGIC ||
	    vginfo.version < 0x0102)
		return 0;	/* Not present */
#endif /* CONFIG_VIDEO_VESA || CONFIG_FIRMWARE_EDID */
#ifdef CONFIG_VIDEO_VESA
	set_fs(vginfo.video_mode_ptr.seg);
	mode_ptr = vginfo.video_mode_ptr.off;

	while ((mode = rdfs16(mode_ptr)) != 0xffff) {
		mode_ptr += 2;

		if (!heap_free(sizeof(struct mode_info)))
			break;	/* Heap full, can't save mode info */

		if (mode & ~0x1ff)
			continue;

		memset(&vminfo, 0, sizeof vminfo); /* Just in case... */

		ax = 0x4f01;
		cx = mode;
		di = (size_t)&vminfo;
		asm(INT10
		    : "+a" (ax), "+c" (cx), "+D" (di), "=m" (vminfo)
		    : : "ebx", "edx", "esi");

		if (ax != 0x004f)
			continue;

		if ((vminfo.mode_attr & 0x15) == 0x05) {
			/* Text Mode, TTY BIOS supported,
			   supported by hardware */
			mi = GET_HEAP(struct mode_info, 1);
			mi->mode  = mode + VIDEO_FIRST_VESA;
			mi->depth = 0; /* text */
			mi->x     = vminfo.h_res;
			mi->y     = vminfo.v_res;
			nmodes++;
		} else if ((vminfo.mode_attr & 0x99) == 0x99 &&
static int bios_probe(void)
{
	u8 mode;
#ifdef _WAKEUP
	u8 saved_mode = 0x03;
#else
	u8 saved_mode = boot_params.screen_info.orig_video_mode;
#endif
	u16 crtc;
	struct mode_info *mi;
	int nmodes = 0;

	if (adapter != ADAPTER_EGA && adapter != ADAPTER_VGA)
		return 0;

	set_fs(0);
	crtc = vga_crtc();

	video_bios.modes = GET_HEAP(struct mode_info, 0);

	for (mode = 0x14; mode <= 0x7f; mode++) {
		if (!heap_free(sizeof(struct mode_info)))
			break;

		if (mode_defined(VIDEO_FIRST_BIOS+mode))
			continue;

		if (set_bios_mode(mode))
			continue;

		/* Try to verify that it's a text mode. */

		/* Attribute Controller: make graphics controller disabled */
		if (in_idx(0x3c0, 0x10) & 0x01)
			continue;

		/* Graphics Controller: verify Alpha addressing enabled */
		if (in_idx(0x3ce, 0x06) & 0x01)
			continue;

		/* CRTC cursor location low should be zero(?) */
		if (in_idx(crtc, 0x0f))
			continue;

		mi = GET_HEAP(struct mode_info, 1);
		mi->mode = VIDEO_FIRST_BIOS+mode;
		mi->depth = 0;	/* text */
		mi->x = rdfs16(0x44a);
		mi->y = rdfs8(0x484)+1;
		nmodes++;
	}

	set_bios_mode(saved_mode);

	return nmodes;
}
Ejemplo n.º 3
0
static int vesa_probe(void)
{
	struct biosregs ireg, oreg;
	u16 mode;
	addr_t mode_ptr;
	struct mode_info *mi;
	int nmodes = 0;

	video_vesa.modes = GET_HEAP(struct mode_info, 0);

	initregs(&ireg);
	ireg.ax = 0x4f00;
	ireg.di = (size_t)&vginfo;
	intcall(0x10, &ireg, &oreg);

	if (oreg.ax != 0x004f ||
	    vginfo.signature != VESA_MAGIC ||
	    vginfo.version < 0x0102)
		return 0;	/* Not present */

	set_fs(vginfo.video_mode_ptr.seg);
	mode_ptr = vginfo.video_mode_ptr.off;

	while ((mode = rdfs16(mode_ptr)) != 0xffff) {
		mode_ptr += 2;

		if (!heap_free(sizeof(struct mode_info)))
			break;	/* Heap full, can't save mode info */

		if (mode & ~0x1ff)
			continue;

		memset(&vminfo, 0, sizeof vminfo); /* Just in case... */

		ireg.ax = 0x4f01;
		ireg.cx = mode;
		ireg.di = (size_t)&vminfo;
		intcall(0x10, &ireg, &oreg);

		if (oreg.ax != 0x004f)
			continue;

		if ((vminfo.mode_attr & 0x15) == 0x05) {
			/* Text Mode, TTY BIOS supported,
			   supported by hardware */
			mi = GET_HEAP(struct mode_info, 1);
			mi->mode  = mode + VIDEO_FIRST_VESA;
			mi->depth = 0; /* text */
			mi->x     = vminfo.h_res;
			mi->y     = vminfo.v_res;
			nmodes++;
		} else if ((vminfo.mode_attr & 0x99) == 0x99 &&
Ejemplo n.º 4
0
Archivo: mca.c Proyecto: 03199618/linux
int query_mca(void)
{
	struct biosregs ireg, oreg;
	u16 len;

	initregs(&ireg);
	ireg.ah = 0xc0;
	intcall(0x15, &ireg, &oreg);

	if (oreg.eflags & X86_EFLAGS_CF)
		return -1;	/* No MCA present */

	set_fs(oreg.es);
	len = rdfs16(oreg.bx);

	if (len > sizeof(boot_params.sys_desc_table))
		len = sizeof(boot_params.sys_desc_table);

	copy_from_fs(&boot_params.sys_desc_table, oreg.bx, len);
	return 0;
}