diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf index 896e7ba521..51e310303d 100644 --- a/MdePkg/Library/BaseLib/BaseLib.inf +++ b/MdePkg/Library/BaseLib/BaseLib.inf @@ -441,6 +441,7 @@ X64/SwitchStack.asm X64/EnableCache.nasm X64/EnableCache.asm + X64/DisableCache.nasm X64/DisableCache.asm X64/CpuBreakpoint.c | MSFT @@ -623,6 +624,7 @@ X64/CpuIdEx.S | GCC X64/EnableCache.nasm| GCC X64/EnableCache.S | GCC + X64/DisableCache.nasm| GCC X64/DisableCache.S | GCC X64/RdRand.S | GCC ChkStkGcc.c | GCC diff --git a/MdePkg/Library/BaseLib/X64/DisableCache.nasm b/MdePkg/Library/BaseLib/X64/DisableCache.nasm new file mode 100644 index 0000000000..36cd8897ab --- /dev/null +++ b/MdePkg/Library/BaseLib/X64/DisableCache.nasm @@ -0,0 +1,43 @@ +;------------------------------------------------------------------------------ +; +; Copyright (c) 2006 - 2008, 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: +; +; DisableCache.Asm +; +; Abstract: +; +; Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a +; WBINVD instruction. +; +; Notes: +; +;------------------------------------------------------------------------------ + + DEFAULT REL + SECTION .text + +;------------------------------------------------------------------------------ +; VOID +; EFIAPI +; AsmDisableCache ( +; VOID +; ); +;------------------------------------------------------------------------------ +global ASM_PFX(AsmDisableCache) +ASM_PFX(AsmDisableCache): + mov rax, cr0 + bts rax, 30 + btr rax, 29 + mov cr0, rax + wbinvd + ret +