diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf index 84c493e67e..896e7ba521 100644 --- a/MdePkg/Library/BaseLib/BaseLib.inf +++ b/MdePkg/Library/BaseLib/BaseLib.inf @@ -439,6 +439,7 @@ X64/SetJump.asm X64/SwitchStack.nasm X64/SwitchStack.asm + X64/EnableCache.nasm X64/EnableCache.asm X64/DisableCache.asm @@ -620,6 +621,7 @@ X64/CpuId.S | GCC X64/CpuIdEx.nasm| GCC X64/CpuIdEx.S | GCC + X64/EnableCache.nasm| GCC X64/EnableCache.S | GCC X64/DisableCache.S | GCC X64/RdRand.S | GCC diff --git a/MdePkg/Library/BaseLib/X64/EnableCache.nasm b/MdePkg/Library/BaseLib/X64/EnableCache.nasm new file mode 100644 index 0000000000..3f2bd0343f --- /dev/null +++ b/MdePkg/Library/BaseLib/X64/EnableCache.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: +; +; EnableCache.Asm +; +; Abstract: +; +; Flush all caches with a WBINVD instruction, clear the CD bit of CR0 to 0, and clear +; the NW bit of CR0 to 0 +; +; Notes: +; +;------------------------------------------------------------------------------ + + DEFAULT REL + SECTION .text + +;------------------------------------------------------------------------------ +; VOID +; EFIAPI +; AsmEnableCache ( +; VOID +; ); +;------------------------------------------------------------------------------ +global ASM_PFX(AsmEnableCache) +ASM_PFX(AsmEnableCache): + wbinvd + mov rax, cr0 + btr rax, 29 + btr rax, 30 + mov cr0, rax + ret +