Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9f259cc59ba45b8db401d60be9700e275676fb15
Commit: 9f259cc59ba45b8db401d60be9700e275676fb15
Parent: 7ed192906a2144ebc8ca2925a85d27b9c5355668
Author: H. Peter Anvin <[EMAIL PROTECTED]>
AuthorDate: Sun Nov 4 17:54:31 2007 -0800
Committer: H. Peter Anvin <[EMAIL PROTECTED]>
CommitDate: Sun Nov 4 19:48:04 2007 -0800
x86 setup: set %ebx == %ebp == %edi == 0 on protected mode entry
In accordance with the newly formalized 32-bit boot protocol, set
%ebx == %ebp == %edi == 0 in order to support future extensions to the
protocol.
Signed-off-by: H. Peter Anvin <[EMAIL PROTECTED]>
---
arch/x86/boot/pmjump.S | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/arch/x86/boot/pmjump.S b/arch/x86/boot/pmjump.S
index 26baeab..fa6bed1 100644
--- a/arch/x86/boot/pmjump.S
+++ b/arch/x86/boot/pmjump.S
@@ -28,11 +28,13 @@
* void protected_mode_jump(u32 entrypoint, u32 bootparams);
*/
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
movw $__BOOT_DS, %cx
+ xorl %ebx, %ebx # Per the 32-bit boot protocol
+ xorl %ebp, %ebp # Per the 32-bit boot protocol
+ xorl %edi, %edi # Per the 32-bit boot protocol
movl %cr0, %edx
orb $1, %dl # Protected mode (PE) bit
-
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