2008-11-03 10:25:10 +01:00
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#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006 - 2008, 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.S
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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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#------------------------------------------------------------------------------
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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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.global ASM_PFX(InternalX86EnablePaging64)
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ASM_PFX(InternalX86EnablePaging64):
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cli
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pop %rax # skip the return address
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callq Base
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Base:
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addl $(L1-Base),(%rsp) # offset for ret, seg is the 1st arg
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mov %cr4,%rax
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or $0x20,%al
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mov %rax,%cr4 # enable PAE
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mov $0xc0000080,%ecx
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rdmsr
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or $0x1,%ah # set LME
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wrmsr
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mov %cr0,%rax
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bts $0x1f,%eax
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mov %rax,%cr0 # enable paging
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lret
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L1: # long mode starts here
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addr32 mov (%esp),%rbx
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addr32 mov 0x8(%esp),%rcx
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addr32 mov 0x10(%esp),%rdx
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addr32 mov 0x18(%esp),%rsp
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add $-0x20,%rsp
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callq *%rbx
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jmp . # dead loop if EntryPoint() returned
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