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| author | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2008-09-25 02:24:20 +0000 |
|---|---|---|
| committer | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2008-09-25 02:24:20 +0000 |
| commit | 583828c1a0fcb8af9f20e1bdc5bae6ad86b43624 (patch) | |
| tree | 1b1fac4bc343f7220aedba2afea5bdb676309e4e /MdePkg/Library/BaseLib/X86DisablePaging64.c | |
| parent | 3c6a5186ae644cb01cad0502ba49d8f630eb8fd1 (diff) | |
| download | edk2-platforms-583828c1a0fcb8af9f20e1bdc5bae6ad86b43624.tar.xz | |
Change name.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5967 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseLib/X86DisablePaging64.c')
| -rw-r--r-- | MdePkg/Library/BaseLib/X86DisablePaging64.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X86DisablePaging64.c b/MdePkg/Library/BaseLib/X86DisablePaging64.c new file mode 100644 index 0000000000..c67e535da7 --- /dev/null +++ b/MdePkg/Library/BaseLib/X86DisablePaging64.c @@ -0,0 +1,63 @@ +/** @file
+ IA-32/x64 AsmDisablePaging64()
+
+ 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 64-bit paging mode on the CPU.
+
+ Disables the 64-bit paging mode on the CPU and returns to 32-bit protected
+ mode. This function assumes the current execution mode is 64-paging mode.
+ This function is only available on X64. After the 64-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 0. The function EntryPoint must never return.
+
+ If the current execution mode is not 64-bit paged mode, then ASSERT().
+ If EntryPoint is 0, then ASSERT().
+ If NewStack is 0, then ASSERT().
+
+ @param Cs The 16-bit selector to load in the CS before EntryPoint
+ is called. The descriptor in the GDT that this selector
+ references must be setup for 32-bit protected mode.
+ @param EntryPoint The 64-bit virtual address of the function to call with
+ the new stack after paging is disabled.
+ @param Context1 The 64-bit virtual address of the context to pass into
+ the EntryPoint function as the first parameter after
+ paging is disabled.
+ @param Context2 The 64-bit virtual address of the context to pass into
+ the EntryPoint function as the second parameter after
+ paging is disabled.
+ @param NewStack The 64-bit virtual address of the new stack to use for
+ the EntryPoint function after paging is disabled.
+
+**/
+VOID
+EFIAPI
+AsmDisablePaging64 (
+ IN UINT16 Cs,
+ IN UINT32 EntryPoint,
+ IN UINT32 Context1, OPTIONAL
+ IN UINT32 Context2, OPTIONAL
+ IN UINT32 NewStack
+ )
+{
+ ASSERT (EntryPoint != 0);
+ ASSERT (NewStack != 0);
+ InternalX86DisablePaging64 (Cs, EntryPoint, Context1, Context2, NewStack);
+}
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