diff options
| author | rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-11-16 09:38:12 +0000 |
|---|---|---|
| committer | rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-11-16 09:38:12 +0000 |
| commit | 3a4b9eba07e5cd1866842b0173fac93ffdb931e9 (patch) | |
| tree | 537a5a505365b1b5fa680801a96c31be3cb4c2cc /DuetPkg/BootSector/start32.S | |
| parent | 4a6876b72f2d654c168bfe7e3a80da7b98fff8b5 (diff) | |
DuetPkg BootSector:
Update start.asm(S)/start16.asm(S)/start32.asm(S)/efi32.asm(S) under DuetPkg\BootSector to follow the IA32 recommendations on switching to protected mode: Immediately following the MOV CR0 instruction, execute a far JMP or far CALL instruction. (This operation is typically a far jump or call to the next instruction in the instruction stream.)
Signed-off-by: rsun3
Reviewed-by: niruiyu
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12723 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'DuetPkg/BootSector/start32.S')
| -rw-r--r-- | DuetPkg/BootSector/start32.S | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/DuetPkg/BootSector/start32.S b/DuetPkg/BootSector/start32.S index c47f92763d..6ce225612f 100644 --- a/DuetPkg/BootSector/start32.S +++ b/DuetPkg/BootSector/start32.S @@ -1,6 +1,6 @@ #------------------------------------------------------------------------------
#*
-#* Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>
+#* Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
#* This program and the accompanying materials
#* are licensed and made available under the terms and conditions of the BSD License
#* which accompanies this distribution. The full text of the license may be found at
@@ -413,7 +413,7 @@ Timeout8042: A20GateEnabled:
-
+ movw $0x0008, %bx # Flat data descriptor
#
# DISABLE INTERRUPTS - Entering Protected Mode
#
@@ -434,11 +434,6 @@ A20GateEnabled: movl %cr0, %eax
orb $1, %al
movl %eax, %cr0
-
- movl $0x008, %eax # Flat data descriptor
- movl $0x00400000, %ebp # Destination of EFILDR32
- movl $0x00070000, %ebx # Length of copy
-
JUMP:
# jmp far 0010:00020000
.byte 0x66
|