diff options
Diffstat (limited to 'EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/x86DisablePaging64.c')
-rw-r--r-- | EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/x86DisablePaging64.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/x86DisablePaging64.c b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/x86DisablePaging64.c new file mode 100644 index 0000000..d4bf650 --- /dev/null +++ b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/x86DisablePaging64.c @@ -0,0 +1,68 @@ +/*++ + +Copyright (c) 2004 - 2006, Intel Corporation +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. + + +Module Name: + + x86DisablePaging64.c + +Abstract: + + IA-32/x64 specific functions. + +--*/ + +#include "BaseLibInternal.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); +} |