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Commit 2f81eccb authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hpa/linux-2.6-x86setup 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hpa/linux-2.6-x86setup:
  [x86 setup] Don't rely on the VESA BIOS being register-clean
parents 6db602d4 4221d014

arch/i386/boot/video-vesa.c

+21 −13
Original line number Diff line number Diff line
@@ -29,7 +29,7 @@ static void vesa_store_mode_params_graphics(void); 
static int vesa_probe(void)

{

#if defined(CONFIG_VIDEO_VESA) || defined(CONFIG_FIRMWARE_EDID)

	u16 ax;

	u16 ax, cx, di;

	u16 mode;

	addr_t mode_ptr;

	struct mode_info *mi;
@@ -39,9 +39,11 @@ static int vesa_probe(void) 


	vginfo.signature = VBE2_MAGIC;



	/* Optimistically assume a VESA BIOS is register-clean... */

	ax = 0x4f00;

	asm("int $0x10" : "+a" (ax), "=m" (vginfo) : "D" (&vginfo));

	di = (size_t)&vginfo;

	asm(INT10

	    : "+a" (ax), "+D" (di), "=m" (vginfo)

	    : : "ebx", "ecx", "edx", "esi");



	if (ax != 0x004f ||

	    vginfo.signature != VESA_MAGIC ||
@@ -64,9 +66,11 @@ static int vesa_probe(void) 
		memset(&vminfo, 0, sizeof vminfo); /* Just in case... */



		ax = 0x4f01;

		asm("int $0x10"

		    : "+a" (ax), "=m" (vminfo)

		    : "c" (mode), "D" (&vminfo));

		cx = mode;

		di = (size_t)&vminfo;

		asm(INT10

		    : "+a" (ax), "+c" (cx), "+D" (di), "=m" (vminfo)

		    : : "ebx", "edx", "esi");



		if (ax != 0x004f)

			continue;
@@ -102,16 +106,18 @@ static int vesa_probe(void) 


static int vesa_set_mode(struct mode_info *mode)

{

	u16 ax;

	u16 ax, bx, cx, di;

	int is_graphic;

	u16 vesa_mode = mode->mode - VIDEO_FIRST_VESA;



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



	ax = 0x4f01;

	asm("int $0x10"

	    : "+a" (ax), "=m" (vminfo)

	    : "c" (vesa_mode), "D" (&vminfo));

	cx = vesa_mode;

	di = (size_t)&vminfo;

	asm(INT10

	    : "+a" (ax), "+c" (cx), "+D" (di), "=m" (vminfo)

	    : : "ebx", "edx", "esi");



	if (ax != 0x004f)

		return -1;
@@ -129,9 +135,11 @@ static int vesa_set_mode(struct mode_info *mode) 




	ax = 0x4f02;

	asm volatile("int $0x10"

		     : "+a" (ax)

		     : "b" (vesa_mode), "D" (0));

	bx = vesa_mode;

	di = 0;

	asm volatile(INT10

		     : "+a" (ax), "+b" (bx), "+D" (di)

		     : : "ecx", "edx", "esi");



	if (ax != 0x004f)

		return -1;