diff options
Diffstat (limited to 'arch/i386')
| -rw-r--r-- | arch/i386/boot/header.S | 2 | ||||
| -rw-r--r-- | arch/i386/boot/memory.c | 39 | ||||
| -rw-r--r-- | arch/i386/boot/video.c | 14 | ||||
| -rw-r--r-- | arch/i386/kernel/acpi/wakeup.S | 41 | ||||
| -rw-r--r-- | arch/i386/xen/mmu.c | 5 |
5 files changed, 54 insertions, 47 deletions
diff --git a/arch/i386/boot/header.S b/arch/i386/boot/header.S index 7f4a2c5..f3140e5 100644 --- a/arch/i386/boot/header.S +++ b/arch/i386/boot/header.S @@ -275,7 +275,7 @@ die: hlt jmp die - .size die, .-due + .size die, .-die .section ".initdata", "a" setup_corrupt: diff --git a/arch/i386/boot/memory.c b/arch/i386/boot/memory.c index 1a2e62d..3783539 100644 --- a/arch/i386/boot/memory.c +++ b/arch/i386/boot/memory.c @@ -20,6 +20,7 @@ static int detect_memory_e820(void) { + int count = 0; u32 next = 0; u32 size, id; u8 err; @@ -27,20 +28,33 @@ static int detect_memory_e820(void) do { size = sizeof(struct e820entry); - id = SMAP; + + /* Important: %edx is clobbered by some BIOSes, + so it must be either used for the error output + or explicitly marked clobbered. */ asm("int $0x15; setc %0" - : "=am" (err), "+b" (next), "+d" (id), "+c" (size), + : "=d" (err), "+b" (next), "=a" (id), "+c" (size), "=m" (*desc) - : "D" (desc), "a" (0xe820)); + : "D" (desc), "d" (SMAP), "a" (0xe820)); + + /* Some BIOSes stop returning SMAP in the middle of + the search loop. We don't know exactly how the BIOS + screwed up the map at that point, we might have a + partial map, the full map, or complete garbage, so + just return failure. */ + if (id != SMAP) { + count = 0; + break; + } - if (err || id != SMAP) + if (err) break; - boot_params.e820_entries++; + count++; desc++; - } while (next && boot_params.e820_entries < E820MAX); + } while (next && count < E820MAX); - return boot_params.e820_entries; + return boot_params.e820_entries = count; } static int detect_memory_e801(void) @@ -89,11 +103,16 @@ static int detect_memory_88(void) int detect_memory(void) { + int err = -1; + if (detect_memory_e820() > 0) - return 0; + err = 0; if (!detect_memory_e801()) - return 0; + err = 0; + + if (!detect_memory_88()) + err = 0; - return detect_memory_88(); + return err; } diff --git a/arch/i386/boot/video.c b/arch/i386/boot/video.c index 693f20d..e4ba897 100644 --- a/arch/i386/boot/video.c +++ b/arch/i386/boot/video.c @@ -147,7 +147,7 @@ int mode_defined(u16 mode) } /* Set mode (without recalc) */ -static int raw_set_mode(u16 mode) +static int raw_set_mode(u16 mode, u16 *real_mode) { int nmode, i; struct card_info *card; @@ -165,8 +165,10 @@ static int raw_set_mode(u16 mode) if ((mode == nmode && visible) || mode == mi->mode || - mode == (mi->y << 8)+mi->x) + mode == (mi->y << 8)+mi->x) { + *real_mode = mi->mode; return card->set_mode(mi); + } if (visible) nmode++; @@ -178,7 +180,7 @@ static int raw_set_mode(u16 mode) if (mode >= card->xmode_first && mode < card->xmode_first+card->xmode_n) { struct mode_info mix; - mix.mode = mode; + *real_mode = mix.mode = mode; mix.x = mix.y = 0; return card->set_mode(&mix); } @@ -223,6 +225,7 @@ static void vga_recalc_vertical(void) static int set_mode(u16 mode) { int rv; + u16 real_mode; /* Very special mode numbers... */ if (mode == VIDEO_CURRENT_MODE) @@ -232,13 +235,16 @@ static int set_mode(u16 mode) else if (mode == EXTENDED_VGA) mode = VIDEO_8POINT; - rv = raw_set_mode(mode); + rv = raw_set_mode(mode, &real_mode); if (rv) return rv; if (mode & VIDEO_RECALC) vga_recalc_vertical(); + /* Save the canonical mode number for the kernel, not + an alias, size specification or menu position */ + boot_params.hdr.vid_mode = real_mode; return 0; } diff --git a/arch/i386/kernel/acpi/wakeup.S b/arch/i386/kernel/acpi/wakeup.S index ed0a0f2..f22ba85 100644 --- a/arch/i386/kernel/acpi/wakeup.S +++ b/arch/i386/kernel/acpi/wakeup.S @@ -151,51 +151,30 @@ bogus_real_magic: #define VIDEO_FIRST_V7 0x0900 # Setting of user mode (AX=mode ID) => CF=success + +# For now, we only handle VESA modes (0x0200..0x03ff). To handle other +# modes, we should probably compile in the video code from the boot +# directory. mode_set: movw %ax, %bx -#if 0 - cmpb $0xff, %ah - jz setalias - - testb $VIDEO_RECALC>>8, %ah - jnz _setrec - - cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah - jnc setres - - cmpb $VIDEO_FIRST_SPECIAL>>8, %ah - jz setspc - - cmpb $VIDEO_FIRST_V7>>8, %ah - jz setv7 -#endif - - cmpb $VIDEO_FIRST_VESA>>8, %ah - jnc check_vesa -#if 0 - orb %ah, %ah - jz setmenu -#endif - - decb %ah -# jz setbios Add bios modes later + subb $VIDEO_FIRST_VESA>>8, %bh + cmpb $2, %bh + jb check_vesa -setbad: clc +setbad: + clc ret check_vesa: - subb $VIDEO_FIRST_VESA>>8, %bh orw $0x4000, %bx # Use linear frame buffer movw $0x4f02, %ax # VESA BIOS mode set call int $0x10 cmpw $0x004f, %ax # AL=4f if implemented - jnz _setbad # AH=0 if OK + jnz setbad # AH=0 if OK stc ret -_setbad: jmp setbad - .code32 ALIGN diff --git a/arch/i386/xen/mmu.c b/arch/i386/xen/mmu.c index 4ae038a..874db0c 100644 --- a/arch/i386/xen/mmu.c +++ b/arch/i386/xen/mmu.c @@ -559,6 +559,9 @@ void xen_exit_mmap(struct mm_struct *mm) put_cpu(); spin_lock(&mm->page_table_lock); - xen_pgd_unpin(mm->pgd); + + /* pgd may not be pinned in the error exit path of execve */ + if (PagePinned(virt_to_page(mm->pgd))) + xen_pgd_unpin(mm->pgd); spin_unlock(&mm->page_table_lock); } |