MdePkg/Library/BaseLib/Ia32/FlushCacheLine.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   FlushCacheLine.Asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   AsmFlushCacheLine function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     SECTION .text
  19
  20 ;------------------------------------------------------------------------------
  21 ; VOID *
  22 ; EFIAPI
  23 ; AsmFlushCacheLine (
  24 ;   IN      VOID                      *LinearAddress
  25 ;   );
  26 ;------------------------------------------------------------------------------
  27 global ASM_PFX(AsmFlushCacheLine)
  28 ASM_PFX(AsmFlushCacheLine):
  29     ;
  30     ; If the CPU does not support CLFLUSH instruction,
  31     ; then promote flush range to flush entire cache.
  32     ;
  33     mov     eax, 1
  34     push    ebx
  35     cpuid
  36     pop     ebx
  37     mov     eax, [esp + 4]
  38     test    edx, BIT19
  39     jz      .0
  40     clflush [eax]
  41     ret
  42 .0:
  43     wbinvd
  44     ret
  45