MdePkg/Library/BaseLib/Ia32/FlushCacheLine.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
   4 ; This program and the accompanying materials
   5 ; are licensed and made available under the terms and conditions of the BSD License
   6 ; which accompanies this distribution.  The full text of the license may be found at
   7 ; http://opensource.org/licenses/bsd-license.php.
   8 ;
   9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 ;
  12 ; Module Name:
  13 ;
  14 ;   FlushCacheLine.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   AsmFlushCacheLine function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     SECTION .text
  25
  26 ;------------------------------------------------------------------------------
  27 ; VOID *
  28 ; EFIAPI
  29 ; AsmFlushCacheLine (
  30 ;   IN      VOID                      *LinearAddress
  31 ;   );
  32 ;------------------------------------------------------------------------------
  33 global ASM_PFX(AsmFlushCacheLine)
  34 ASM_PFX(AsmFlushCacheLine):
  35     ;
  36     ; If the CPU does not support CLFLUSH instruction,
  37     ; then promote flush range to flush entire cache.
  38     ;
  39     mov     eax, 1
  40     push    ebx
  41     cpuid
  42     pop     ebx
  43     mov     eax, [esp + 4]
  44     test    edx, BIT19
  45     jz      .0
  46     clflush [eax]
  47     ret
  48 .0:
  49     wbinvd
  50     ret
  51