MdePkg/Library/BaseLib/Ia32/FlushCacheLine.c

   1 /** @file
   2   AsmFlushCacheLine function
   3
   4   Copyright (c) 2006 - 2007, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 //
  16 // Include common header file for this module.
  17 //
  18
  19
  20 /**
  21   Flushes a cache line from all the instruction and data caches within the
  22   coherency domain of the CPU.
  23
  24   Flushed the cache line specified by LinearAddress, and returns LinearAddress.
  25   This function is only available on IA-32 and X64.
  26
  27   @param  LinearAddress The address of the cache line to flush. If the CPU is
  28                         in a physical addressing mode, then LinearAddress is a
  29                         physical address. If the CPU is in a virtual
  30                         addressing mode, then LinearAddress is a virtual
  31                         address.
  32
  33   @return LinearAddress
  34 **/
  35 VOID *
  36 EFIAPI
  37 AsmFlushCacheLine (
  38   IN      VOID                      *LinearAddress
  39   )
  40 {
  41   _asm {
  42     mov     eax, LinearAddress
  43     clflush [eax]
  44   }
  45 }
  46