MdePkg/Library/BaseMemoryLibRepStr/X64/SetMem.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 ;   SetMem.Asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   SetMem function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     DEFAULT REL
  19     SECTION .text
  20
  21 ;------------------------------------------------------------------------------
  22 ;  VOID *
  23 ;  EFIAPI
  24 ;  InternalMemSetMem (
  25 ;    IN VOID   *Buffer,
  26 ;    IN UINTN  Count,
  27 ;    IN UINT8  Value
  28 ;    )
  29 ;------------------------------------------------------------------------------
  30 global ASM_PFX(InternalMemSetMem)
  31 ASM_PFX(InternalMemSetMem):
  32     push    rdi
  33     mov     rax, r8    ; rax = Value
  34     mov     rdi, rcx   ; rdi = Buffer
  35     xchg    rcx, rdx   ; rcx = Count, rdx = Buffer
  36     rep     stosb
  37     mov     rax, rdx   ; rax = Buffer
  38     pop     rdi
  39     ret
  40