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| author | rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524> | 2010-09-07 10:23:05 +0000 |
|---|---|---|
| committer | rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524> | 2010-09-07 10:23:05 +0000 |
| commit | 84a773d18bb2d021d760374dafce347a6908b4a4 (patch) | |
| tree | 0320a5762d54e55e9ed6ba4d52f3426227069a52 /UefiCpuPkg/ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm | |
| parent | 09a90201eec3302b7461e22bb933923ade1f6196 (diff) | |
| download | edk2-platforms-84a773d18bb2d021d760374dafce347a6908b4a4.tar.xz | |
Rename two files to follow the file naming convention.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10853 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'UefiCpuPkg/ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm')
| -rw-r--r-- | UefiCpuPkg/ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/UefiCpuPkg/ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm b/UefiCpuPkg/ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm new file mode 100644 index 0000000000..9eba864c28 --- /dev/null +++ b/UefiCpuPkg/ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm @@ -0,0 +1,46 @@ +;------------------------------------------------------------------------------
+; @file
+; Transition from 32 bit flat protected mode into 64 bit flat protected mode
+;
+; Copyright (c) 2008 - 2009, 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
+; http://opensource.org/licenses/bsd-license.php
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;------------------------------------------------------------------------------
+
+BITS 32
+
+;
+; Modified: EAX
+;
+Transition32FlatTo64Flat:
+
+ mov eax, ((ADDR_OF_START_OF_RESET_CODE & ~0xfff) - 0x1000)
+ mov cr3, eax
+
+ mov eax, cr4
+ bts eax, 5 ; enable PAE
+ mov cr4, eax
+
+ mov ecx, 0xc0000080
+ rdmsr
+ bts eax, 8 ; set LME
+ wrmsr
+
+ mov eax, cr0
+ bts eax, 31 ; set PG
+ mov cr0, eax ; enable paging
+
+ jmp LINEAR_CODE64_SEL:ADDR_OF(jumpTo64BitAndLandHere)
+BITS 64
+jumpTo64BitAndLandHere:
+
+ debugShowPostCode POSTCODE_64BIT_MODE
+
+ OneTimeCallRet Transition32FlatTo64Flat
+
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