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

1 files changed, 21 insertions, 13 deletions

diff --git a/arch/i386/boot/video-vesa.c b/arch/i386/boot/video-vesa.c
index f1bc71e..1921907 100644
--- a/arch/i386/boot/video-vesa.c
+++ b/arch/i386/boot/video-vesa.c
@@ -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;