OvmfPkg/Library/QemuFwCfgLib/X64/IoLibExAsm.nasm

   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     DEFAULT REL
  15     SECTION .text
  16
  17 ;------------------------------------------------------------------------------
  18 ;  VOID
  19 ;  EFIAPI
  20 ;  IoReadFifo8 (
  21 ;    IN UINTN                  Port,              // rcx
  22 ;    IN UINTN                  Size,              // rdx
  23 ;    IN VOID                   *Buffer            // r8
  24 ;    );
  25 ;------------------------------------------------------------------------------
  26 global ASM_PFX(IoReadFifo8)
  27 ASM_PFX(IoReadFifo8):
  28
  29     xchg    rcx, rdx
  30     xchg    rdi, r8             ; rdi: buffer address; r8: save rdi
  31 rep insb
  32     mov     rdi, r8             ; restore rdi
  33     ret
  34
  35 ;------------------------------------------------------------------------------
  36 ;  VOID
  37 ;  EFIAPI
  38 ;  IoWriteFifo8 (
  39 ;    IN UINTN                  Port,              // rcx
  40 ;    IN UINTN                  Size,              // rdx
  41 ;    IN VOID                   *Buffer            // r8
  42 ;    );
  43 ;------------------------------------------------------------------------------
  44 global ASM_PFX(IoWriteFifo8)
  45 ASM_PFX(IoWriteFifo8):
  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