diff options
Diffstat (limited to 'arch/i386/boot')
-rw-r--r-- | arch/i386/boot/pm.c | 6 | ||||
-rw-r--r-- | arch/i386/boot/video-vesa.c | 34 |
2 files changed, 26 insertions, 14 deletions
diff --git a/arch/i386/boot/pm.c b/arch/i386/boot/pm.c index 6be9ca811d1..09fb342cc62 100644 --- a/arch/i386/boot/pm.c +++ b/arch/i386/boot/pm.c @@ -122,7 +122,11 @@ static void setup_gdt(void) /* DS: data, read/write, 4 GB, base 0 */ [GDT_ENTRY_BOOT_DS] = GDT_ENTRY(0xc093, 0, 0xfffff), }; - struct gdt_ptr gdt; + /* Xen HVM incorrectly stores a pointer to the gdt_ptr, instead + of the gdt_ptr contents. Thus, make it static so it will + stay in memory, at least long enough that we switch to the + proper kernel GDT. */ + static struct gdt_ptr gdt; gdt.len = sizeof(boot_gdt)-1; gdt.ptr = (u32)&boot_gdt + (ds() << 4); diff --git a/arch/i386/boot/video-vesa.c b/arch/i386/boot/video-vesa.c index f1bc71e948c..19219071071 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; |