OvmfPkg/Library/QemuFwCfgLib/X64/IoLibExAsm.S

   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 #------------------------------------------------------------------------------
  15 #  VOID
  16 #  EFIAPI
  17 #  IoReadFifo8 (
  18 #    IN UINTN                  Port,              // rcx
  19 #    IN UINTN                  Size,              // rdx
  20 #    IN VOID                   *Buffer            // r8
  21 #    );
  22 #------------------------------------------------------------------------------
  23 ASM_GLOBAL ASM_PFX(IoReadFifo8)
  24 ASM_PFX(IoReadFifo8):
  25     xchg    %rcx, %rdx
  26     xchg    %r8, %rdi           # rdi: buffer address; r8: save rdi
  27 rep insb
  28     mov     %r8, %rdi           # restore rdi
  29     ret
  30
  31 #------------------------------------------------------------------------------
  32 #  VOID
  33 #  EFIAPI
  34 #  IoWriteFifo8 (
  35 #    IN UINTN                  Port,              // rcx
  36 #    IN UINTN                  Size,              // rdx
  37 #    IN VOID                   *Buffer            // r8
  38 #    );
  39 #------------------------------------------------------------------------------
  40 ASM_GLOBAL ASM_PFX(IoWriteFifo8)
  41 ASM_PFX(IoWriteFifo8):
  42     xchg    %rcx, %rdx
  43     xchg    %r8, %rsi           # rdi: buffer address; r8: save rsi
  44 rep outsb
  45     mov     %r8, %rsi           # restore rsi
  46     ret
  47