OvmfPkg/Library/QemuFwCfgLib/X64/IoLibExAsm.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2013, 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 ;------------------------------------------------------------------------------
  13
  14     .code
  15
  16 ;------------------------------------------------------------------------------
  17 ;  VOID
  18 ;  EFIAPI
  19 ;  IoReadFifo8 (
  20 ;    IN UINTN                  Port,              // rcx
  21 ;    IN UINTN                  Size,              // rdx
  22 ;    IN VOID                   *Buffer            // r8
  23 ;    );
  24 ;------------------------------------------------------------------------------
  25 IoReadFifo8 PROC
  26
  27     xchg    rcx, rdx
  28     xchg    rdi, r8             ; rdi: buffer address; r8: save rdi
  29 rep insb
  30     mov     rdi, r8             ; restore rdi
  31     ret
  32
  33 IoReadFifo8 ENDP
  34
  35
  36 ;------------------------------------------------------------------------------
  37 ;  VOID
  38 ;  EFIAPI
  39 ;  IoWriteFifo8 (
  40 ;    IN UINTN                  Port,              // rcx
  41 ;    IN UINTN                  Size,              // rdx
  42 ;    IN VOID                   *Buffer            // r8
  43 ;    );
  44 ;------------------------------------------------------------------------------
  45 IoWriteFifo8 PROC
  46
  47     xchg    rcx, rdx
  48     xchg    rsi, r8             ; rdi: buffer address; r8: save rdi
  49 rep outsb
  50     mov     rsi, r8             ; restore rdi
  51     ret
  52
  53 IoWriteFifo8 ENDP
  54
  55     END
  56