mirror of https://github.com/acidanthera/audk.git
64 lines
2.2 KiB
ArmAsm
64 lines
2.2 KiB
ArmAsm
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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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# InternalX86EnablePaging64 function
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#
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# Notes:
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#
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#------------------------------------------------------------------------------
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.globl ASM_PFX(InternalX86EnablePaging64)
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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 CodeSelector,
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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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ASM_PFX(InternalX86EnablePaging64):
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cli
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movl $LongStart, (%esp)
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movl %cr4, %eax
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orb $0x20, %al
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movl %eax, %cr4 # enable PAE
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movl $0xc0000080, %ecx
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rdmsr
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orb $1, %ah # set LME
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wrmsr
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movl %cr0, %eax
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btsl $31, %eax
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movl %eax, %cr0 # enable paging
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lret
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LongStart: # long mode starts here
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.byte 0x67, 0x48
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movl (%esp), %ebx # mov rbx, [esp]
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.byte 0x67, 0x48
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movl 8(%esp), %ecx # mov rcx, [esp + 8]
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.byte 0x67, 0x48
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movl 0x10(%esp), %edx # mov rdx, [esp + 10h]
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.byte 0x67, 0x48
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movl 0x18(%esp), %esp # mov rsp, [esp + 18h]
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.byte 0x48
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addl $0x-20, %esp # add rsp, -20h
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call *%ebx # call rbx
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jmp .
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