reactos/lib/rtl/i386/fillmemory_ulong_asm.s

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            fillmemory_ulong_asm.S
   5  * PURPOSE:         Memory functions
   6  * PROGRAMMERS:     Patrick Baggett (baggett.patrick@gmail.com)
   7  *                  Alex Ionescu (alex@relsoft.net)
   8  *                  Magnus Olsen (magnusolsen@greatlord.com)
   9  */
  10
  11 .intel_syntax noprefix
  12
  13 /* GLOBALS ****************************************************************/
  14
  15 .globl  _RtlFillMemoryUlong@12          // (no bug) (max optimze code)
  16
  17 /* FUNCTIONS ***************************************************************/
  18
  19 _RtlFillMemoryUlong@12:
  20     mov ecx, dword [esp + 8 ]    // Length
  21     shr ecx,2// Length = Length / sizeof(ULONG)
  22         jz 1f    // if (Length==0) goto .zero
  23
  24     push edi
  25     mov edi, dword [esp + (4 + 4)]         // Destination
  26     mov eax, dword [esp + (12 + 4)]        // Fill
  27     cld
  28     rep stosd// while (Length>0) {Destination[Length-1]=Fill// Length = Length - 1}
  29     pop edi
  30 1:
  31     ret 12