diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2007-11-04 17:50:12 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-12-14 09:50:58 -0800 |
| commit | dcab9753b799bd92a5701106f1861b825c7eef74 (patch) | |
| tree | c02bbb64ed8b34f349bcb4b40c29449781049347 /arch/i386 | |
| parent | 0fe8f9b280a5f7a65aebc51ab6b5200a8bf05e13 (diff) | |
x86 setup: add a near jump to serialize %cr0 on 386/486
patch 7ed192906a2144ebc8ca2925a85d27b9c5355668 in mainline.
The 386 and 486 needs a jump immediately after setting %cr0 in order
to serialize the pipeline.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/i386')
| -rw-r--r-- | arch/i386/boot/pmjump.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/i386/boot/pmjump.S b/arch/i386/boot/pmjump.S index 2e559233725..26baeab3a4d 100644 --- a/arch/i386/boot/pmjump.S +++ b/arch/i386/boot/pmjump.S @@ -31,14 +31,14 @@ protected_mode_jump: xorl %ebx, %ebx # Flag to indicate this is a boot movl %edx, %esi # Pointer to boot_params table movl %eax, 2f # Patch ljmpl instruction - jmp 1f # Short jump to flush instruction q. -1: movw $__BOOT_DS, %cx movl %cr0, %edx orb $1, %dl # Protected mode (PE) bit movl %edx, %cr0 + jmp 1f # Short jump to serialize on 386/486 +1: movw %cx, %ds movw %cx, %es |