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| author | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2008-09-25 02:23:58 +0000 |
|---|---|---|
| committer | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2008-09-25 02:23:58 +0000 |
| commit | 3c6a5186ae644cb01cad0502ba49d8f630eb8fd1 (patch) | |
| tree | 19439d82dcc26c55df527d24c8a39b4372c355a4 /MdePkg/Library/BaseLib/X86DisablePaging32.c | |
| parent | 8cefc2ee7000517970c0755e5e80de4fb243d5d5 (diff) | |
| download | edk2-3c6a5186ae644cb01cad0502ba49d8f630eb8fd1.tar.gz edk2-3c6a5186ae644cb01cad0502ba49d8f630eb8fd1.tar.bz2 edk2-3c6a5186ae644cb01cad0502ba49d8f630eb8fd1.zip | |
Change name.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5966 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseLib/X86DisablePaging32.c')
| -rw-r--r-- | MdePkg/Library/BaseLib/X86DisablePaging32.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X86DisablePaging32.c b/MdePkg/Library/BaseLib/X86DisablePaging32.c new file mode 100644 index 0000000000..976ba8bc07 --- /dev/null +++ b/MdePkg/Library/BaseLib/X86DisablePaging32.c @@ -0,0 +1,66 @@ +/** @file
+ IA-32/x64 AsmDisablePaging32()
+
+ Copyright (c) 2006, Intel Corporation<BR>
+ All rights reserved. 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.
+
+ If the current execution mode is not 32-bit paged mode, then ASSERT().
+ If EntryPoint is NULL, then ASSERT().
+ If NewStack is NULL, then ASSERT().
+
+ 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.
+
+**/
+VOID
+EFIAPI
+AsmDisablePaging32 (
+ IN SWITCH_STACK_ENTRY_POINT EntryPoint,
+ IN VOID *Context1, OPTIONAL
+ IN VOID *Context2, OPTIONAL
+ IN VOID *NewStack
+ )
+{
+ ASSERT (EntryPoint != NULL);
+ ASSERT (NewStack != NULL);
+ InternalX86DisablePaging32 (EntryPoint, Context1, Context2, NewStack);
+}
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