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DuetPkg BootSector:

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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
This commit is contained in:
rsun3
2011-11-16 09:38:12 +00:00
parent 4a6876b72f
commit 3a4b9eba07
14 changed files with 33 additions and 44 deletions
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8
DuetPkg/BootSector/start.S
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@@ -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
@@ -404,6 +404,7 @@ Timeout8042:
A20GateEnabled:
movw $0x0008, %bx # Flat data descriptor
#
# DISABLE INTERRUPTS - Entering Protected Mode
@@ -425,11 +426,6 @@ 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