/** @file\r
AsmFlushCacheLine function\r
\r
- Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
- All rights reserved. This program and the accompanying materials\r
- are licensed and made available under the terms and conditions of the BSD License\r
- which accompanies this distribution. The full text of the license may be found at\r
- http://opensource.org/licenses/bsd-license.php\r
-\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+ Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
+ SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
-//\r
-// Include common header file for this module.\r
-//\r
-#include "CommonHeader.h"\r
+/**\r
+ Flushes a cache line from all the instruction and data caches within the\r
+ coherency domain of the CPU.\r
+\r
+ Flushed the cache line specified by LinearAddress, and returns LinearAddress.\r
+ This function is only available on IA-32 and x64.\r
+\r
+ @param LinearAddress The address of the cache line to flush. If the CPU is\r
+ in a physical addressing mode, then LinearAddress is a\r
+ physical address. If the CPU is in a virtual\r
+ addressing mode, then LinearAddress is a virtual\r
+ address.\r
\r
+ @return LinearAddress\r
+**/\r
VOID *\r
EFIAPI\r
AsmFlushCacheLine (\r
- IN VOID *LinearAddress\r
+ IN VOID *LinearAddress\r
)\r
{\r
+ //\r
+ // If the CPU does not support CLFLUSH instruction,\r
+ // then promote flush range to flush entire cache.\r
+ //\r
_asm {\r
- mov eax, LinearAddress\r
+ mov eax, 1\r
+ cpuid\r
+ test edx, BIT19\r
+ jz NoClflush\r
+ mov eax, dword ptr [LinearAddress]\r
clflush [eax]\r
+ jmp Done\r
+NoClflush:\r
+ wbinvd\r
+Done:\r
}\r
-}\r
\r
+ return LinearAddress;\r
+}\r