diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/DisablePaging64.S')
-rw-r--r-- | MdePkg/Library/BaseLib/X64/DisablePaging64.S | 82 |
1 files changed, 0 insertions, 82 deletions
diff --git a/MdePkg/Library/BaseLib/X64/DisablePaging64.S b/MdePkg/Library/BaseLib/X64/DisablePaging64.S deleted file mode 100644 index 676e9e175a..0000000000 --- a/MdePkg/Library/BaseLib/X64/DisablePaging64.S +++ /dev/null @@ -1,82 +0,0 @@ -#------------------------------------------------------------------------------
-#
-# Copyright (c) 2006 - 2009, 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.S
-#
-# Abstract:
-#
-# AsmDisablePaging64 function
-#
-# Notes:
-#
-#------------------------------------------------------------------------------
-
-
-
-#------------------------------------------------------------------------------
-# VOID
-# EFIAPI
-# InternalX86DisablePaging64 (
-# IN UINT16 Cs,
-# IN UINT32 EntryPoint,
-# IN UINT32 Context1, OPTIONAL
-# IN UINT32 Context2, OPTIONAL
-# IN UINT32 NewStack
-# );
-#------------------------------------------------------------------------------
-
-ASM_GLOBAL ASM_PFX(InternalX86DisablePaging64)
-ASM_PFX(InternalX86DisablePaging64):
- cli
- lea L1(%rip), %rsi # rsi <- The start address of transition code
- mov 0x28(%rsp), %edi # rdi <- New stack
- lea _mTransitionEnd(%rip), %rax # rax <- end of transition code
- sub %rsi, %rax # rax <- The size of transition piece code
- add $4, %rax # round rax up to the next 4 byte boundary
- and $0xfc, %al
- sub %rax, %rdi # rdi <- use stack to hold transition code
- mov %edi, %r10d # r10 <- The start address of transicition code below 4G
- push %rcx # save rcx to stack
- mov %rax, %rcx # rcx <- The size of transition piece code
- rep
- movsb # copy transition code to (new stack - 64byte) below 4G
- pop %rcx # restore rcx
-
- mov %r8d, %esi
- mov %r9d, %edi
- mov %r10d, %eax
- sub $4, %eax
- push %rcx # push Cs to stack
- push %r10 # push address of transition code on stack
- .byte 0x48, 0xcb # retq: Use far return to load CS register from stack
- # (Use raw byte code since some GNU assemblers generates incorrect code for "retq")
-L1:
- mov %eax,%esp # set up new stack
- mov %cr0,%rax
- btr $0x1f,%eax # clear CR0.PG
- mov %rax,%cr0 # disable paging
-
- mov %edx,%ebx # save EntryPoint to ebx, for rdmsr will overwrite edx
- mov $0xc0000080,%ecx
- rdmsr
- and $0xfe,%ah # clear LME
- wrmsr
- mov %cr4,%rax
- and $0xdf,%al # clear PAE
- mov %rax,%cr4
- push %rdi # push Context2
- push %rsi # push Context1
- callq *%rbx # transfer control to EntryPoint
- jmp . # no one should get here
-
-_mTransitionEnd :
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