MdePkg/Library/BaseLib/X64/WriteDr4.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   WriteDr4.Asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   AsmWriteDr4 function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     DEFAULT REL
  19     SECTION .text
  20
  21 ;------------------------------------------------------------------------------
  22 ; UINTN
  23 ; EFIAPI
  24 ; AsmWriteDr4 (
  25 ;   IN UINTN Value
  26 ;   );
  27 ;------------------------------------------------------------------------------
  28 global ASM_PFX(AsmWriteDr4)
  29 ASM_PFX(AsmWriteDr4):
  30     ;
  31     ; There's no obvious reason to access this register, since it's aliased to
  32     ; DR6 when DE=0 or an exception generated when DE=1
  33     ;
  34     DB      0xf, 0x23, 0xe1
  35     mov     rax, rcx
  36     ret
  37