diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/Ia32/DisablePaging32.c')
-rw-r--r-- | MdePkg/Library/BaseLib/Ia32/DisablePaging32.c | 77 |
1 files changed, 0 insertions, 77 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/DisablePaging32.c b/MdePkg/Library/BaseLib/Ia32/DisablePaging32.c deleted file mode 100644 index 26e9bd57cf..0000000000 --- a/MdePkg/Library/BaseLib/Ia32/DisablePaging32.c +++ /dev/null @@ -1,77 +0,0 @@ -/** @file
- AsmDisablePaging32 function.
-
- Copyright (c) 2006 - 2008, 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.
-
-**/
-
-#include "BaseLibInternals.h"
-
-/**
- Disables the 32-bit paging mode on the CPU.
-
- Disables the 32-bit paging mode on the CPU and returns to 32-bit protected
- mode. This function assumes the current execution mode is 32-paged protected
- mode. This function is only available on IA-32. After the 32-bit paging mode
- is disabled, control is transferred to the function specified by EntryPoint
- using the new stack specified by NewStack and passing in the parameters
- specified by Context1 and Context2. Context1 and Context2 are optional and
- may be NULL. The function EntryPoint must never return.
-
- There are a number of constraints that must be followed before calling this
- function:
- 1) Interrupts must be disabled.
- 2) The caller must be in 32-bit paged mode.
- 3) CR0, CR3, and CR4 must be compatible with 32-bit paged mode.
- 4) CR3 must point to valid page tables that guarantee that the pages for
- this function and the stack are identity mapped.
-
- @param EntryPoint A pointer to function to call with the new stack after
- paging is disabled.
- @param Context1 A pointer to the context to pass into the EntryPoint
- function as the first parameter after paging is disabled.
- @param Context2 A pointer to the context to pass into the EntryPoint
- function as the second parameter after paging is
- disabled.
- @param NewStack A pointer to the new stack to use for the EntryPoint
- function after paging is disabled.
-
-**/
-__declspec (naked)
-VOID
-EFIAPI
-InternalX86DisablePaging32 (
- IN SWITCH_STACK_ENTRY_POINT EntryPoint,
- IN VOID *Context1, OPTIONAL
- IN VOID *Context2, OPTIONAL
- IN VOID *NewStack
- )
-{
- _asm {
- push ebp
- mov ebp, esp
- mov ebx, EntryPoint
- mov ecx, Context1
- mov edx, Context2
- pushfd
- pop edi // save EFLAGS to edi
- cli
- mov eax, cr0
- btr eax, 31
- mov esp, NewStack
- mov cr0, eax
- push edi
- popfd // restore EFLAGS from edi
- push edx
- push ecx
- call ebx
- jmp $ // EntryPoint() should not return
- }
-}
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