diff options
Diffstat (limited to 'EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X64/DisablePaging64.asm')
-rw-r--r-- | EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X64/DisablePaging64.asm | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X64/DisablePaging64.asm b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X64/DisablePaging64.asm new file mode 100644 index 0000000..3d86cc5 --- /dev/null +++ b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X64/DisablePaging64.asm @@ -0,0 +1,64 @@ +; Copyright (c) 2004, 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: +; +; DisablePaging64.Asm +; +; Abstract: +; +; AsmDisablePaging64 function +; +; Notes: +; +;------------------------------------------------------------------------------ + + .code + +;------------------------------------------------------------------------------ +; VOID +; EFIAPI +; InternalX86DisablePaging64 ( +; IN UINT16 Cs, +; IN UINT32 EntryPoint, +; IN UINT32 Context1, OPTIONAL +; IN UINT32 Context2, OPTIONAL +; IN UINT32 NewStack +; ); +;------------------------------------------------------------------------------ +InternalX86DisablePaging64 PROC + cli + shl rcx, 32 + lea eax, @F + mov ecx, eax + push rcx + mov ebx, edx + mov esi, r8d + mov edi, r9d + mov eax, [rsp + 28h] + retf +@@: + mov esp, eax ; set up new stack + mov rax, cr0 + btr eax, 31 + mov cr0, rax ; disable paging + mov ecx, 0c0000080h + rdmsr + and ah, NOT 1 ; clear LME + wrmsr + mov rax, cr4 + and al, NOT (1 SHL 5) ; clear PAE + mov cr4, rax + push rdi + push rsi + call rbx + jmp $ +InternalX86DisablePaging64 ENDP + + END |