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 66d57f68bd74..000000000000 --- 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 : |