mirror of https://github.com/acidanthera/audk.git
68 lines
2.4 KiB
ArmAsm
68 lines
2.4 KiB
ArmAsm
#------------------------------------------------------------------------------
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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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# DisablePaging64.S
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#
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# Abstract:
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#
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# AsmDisablePaging64 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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# InternalX86DisablePaging64 (
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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 UINT32 Context2, OPTIONAL
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# IN UINT64 NewStack
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# );
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#------------------------------------------------------------------------------
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.global ASM_PFX(InternalX86DisablePaging64)
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ASM_PFX(InternalX86DisablePaging64):
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cli
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shl $0x20,%rcx # rcx[32..47] <- Cs
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lea L1, %eax
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mov %r8d, %esi
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or %rax, %rcx # rcx[0..47] <- Cs:@F
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mov %r9d, %edi
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mov 0x28(%rsp), %eax # eax <- New Stack
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push %rcx
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ret # switch to compatibility mode
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L1:
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mov %eax,%esp # set up new stack
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mov %cr0,%rax
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btr $0x1f,%eax
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mov %rax,%cr0 # disable paging
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mov %rdx,%rbx # save EntryPoint to rbx, for rdmsr will overwrite rdx
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mov $0xc0000080,%ecx
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rdmsr
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and $0xfe,%ah # clear LME
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wrmsr
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mov %cr4,%rax
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and $0xdf,%al # clear PAE
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mov %rax,%cr4
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push %rdi # push Context2
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push %rsi # push Context1
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callq *%rbx # transfer control to EntryPoint
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jmp . # no one should get here
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