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MdePkg BaseLib: Convert X64/DisablePaging64.asm to NASM 

The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/DisablePaging64.asm to X64/DisablePaging64.nasm

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Jordan Justen 2016-05-30 18:52:01 -07:00 committed by Liming Gao
parent 079f75d594
commit 464e84f88e
2 changed files with 87 additions and 0 deletions
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3
MdePkg/Library/BaseLib/BaseLib.inf
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@ -463,6 +463,7 @@
X64/Invd.asm | MSFT
X64/Wbinvd.nasm| MSFT
X64/Wbinvd.asm | MSFT
X64/DisablePaging64.nasm| MSFT
X64/DisablePaging64.asm | MSFT
X64/Mwait.asm | MSFT
X64/Monitor.asm | MSFT
@ -544,6 +545,7 @@
X64/Invd.asm | INTEL
X64/Wbinvd.nasm| INTEL
X64/Wbinvd.asm | INTEL
X64/DisablePaging64.nasm| INTEL
X64/DisablePaging64.asm | INTEL
X64/Mwait.asm | INTEL
X64/Monitor.asm | INTEL
@ -634,6 +636,7 @@
X64/LongJump.S | GCC
X64/EnableDisableInterrupts.nasm| GCC
X64/EnableDisableInterrupts.S | GCC
X64/DisablePaging64.nasm| GCC
X64/DisablePaging64.S | GCC
X64/CpuId.nasm| GCC
X64/CpuId.S | GCC

84
MdePkg/Library/BaseLib/X64/DisablePaging64.nasm Normal file
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@ -0,0 +1,84 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2008, 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.
;
; Module Name:
;
; DisablePaging64.Asm
;
; Abstract:
;
; AsmDisablePaging64 function
;
; Notes:
;
;------------------------------------------------------------------------------
DEFAULT REL
SECTION .text
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; InternalX86DisablePaging64 (
; IN UINT16 Cs,
; IN UINT32 EntryPoint,
; IN UINT32 Context1, OPTIONAL
; IN UINT32 Context2, OPTIONAL
; IN UINT32 NewStack
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalX86DisablePaging64)
ASM_PFX(InternalX86DisablePaging64):
cli
lea rsi, [.0] ; rsi <- The start address of transition code
mov edi, [rsp + 0x28] ; rdi <- New stack
lea rax, [mTransitionEnd] ; rax <- end of transition code
sub rax, rsi ; rax <- The size of transition piece code
add rax, 4 ; Round RAX up to the next 4 byte boundary
and al, 0xfc
sub rdi, rax ; rdi <- Use stack to hold transition code
mov r10d, edi ; r10 <- The start address of transicition code below 4G
push rcx ; save rcx to stack
mov rcx, rax ; rcx <- The size of transition piece code
rep movsb ; copy transition code to top of new stack which must be below 4GB
pop rcx ; restore rcx
mov esi, r8d
mov edi, r9d
mov eax, r10d ; eax <- start of the transition code on the stack
sub eax, 4 ; eax <- One slot below transition code on the stack
push rcx ; push Cs to stack
push r10 ; push address of tansition code on stack
DB 0x48 ; prefix to composite "retq" with next "retf"
retf ; Use far return to load CS register from stack
; Start of transition code
.0:
mov esp, eax ; set up new stack
mov rax, cr0
btr eax, 31 ; Clear CR0.PG
mov cr0, rax ; disable paging and caches
mov ebx, edx ; save EntryPoint to rbx, for rdmsr will overwrite rdx
mov ecx, 0xc0000080
rdmsr
and ah, ~ 1 ; clear LME
wrmsr
mov rax, cr4
and al, ~ (1 << 5) ; clear PAE
mov cr4, rax
push rdi ; push Context2
push rsi ; push Context1
call rbx ; transfer control to EntryPoint
hlt ; no one should get here
mTransitionEnd: