mirror of https://github.com/acidanthera/audk.git
69 lines
2.5 KiB
NASM
69 lines
2.5 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, Intel Corporation
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; All rights reserved. This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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; Module Name:
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;
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; EnablePaging64.Asm
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;
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; Abstract:
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;
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; AsmEnablePaging64 function
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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.686p
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.model flat,C
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.code
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;------------------------------------------------------------------------------
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; VOID
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; EFIAPI
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; InternalX86EnablePaging64 (
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; IN UINT16 Cs,
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; IN UINT64 EntryPoint,
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; IN UINT64 Context1, OPTIONAL
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; IN UINT64 Context2, OPTIONAL
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; IN UINT64 NewStack
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; );
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;------------------------------------------------------------------------------
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InternalX86EnablePaging64 PROC
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cli
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mov [esp], @F ; offset for far retf, seg is the 1st arg
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mov eax, cr4
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or al, (1 SHL 5)
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mov cr4, eax ; enable PAE
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mov ecx, 0c0000080h
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rdmsr
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or ah, 1 ; set LME
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wrmsr
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mov eax, cr0
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bts eax, 31 ; set PG
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mov cr0, eax ; enable paging
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retf ; topmost 2 dwords hold the address
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@@: ; long mode starts here
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DB 67h, 48h ; 32-bit address size, 64-bit operand size
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mov ebx, [esp] ; mov rbx, [esp]
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DB 67h, 48h
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mov ecx, [esp + 8] ; mov rcx, [esp + 8]
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DB 67h, 48h
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mov edx, [esp + 10h] ; mov rdx, [esp + 10h]
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DB 67h, 48h
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mov esp, [esp + 18h] ; mov rsp, [esp + 18h]
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DB 48h
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add esp, -20h ; add rsp, -20h
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call ebx ; call rbx
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hlt ; no one should get here
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InternalX86EnablePaging64 ENDP
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END
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