1 files changed, 52 insertions, 0 deletions
diff --git a/OvmfPkg/Library/QemuFwCfgLib/X64/IoLibExAsm.nasm b/OvmfPkg/Library/QemuFwCfgLib/X64/IoLibExAsm.nasm
new file mode 100644
index 0000000000..f1078f2088
--- /dev/null
+++ b/OvmfPkg/Library/QemuFwCfgLib/X64/IoLibExAsm.nasm
@@ -0,0 +1,52 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
+; This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution.  The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+;  VOID
+;  EFIAPI
+;  IoReadFifo8 (
+;    IN UINTN                  Port,              // rcx
+;    IN UINTN                  Size,              // rdx
+;    IN VOID                   *Buffer            // r8
+;    );
+;------------------------------------------------------------------------------
+global ASM_PFX(IoReadFifo8)
+ASM_PFX(IoReadFifo8):
+
+    xchg    rcx, rdx
+    xchg    rdi, r8             ; rdi: buffer address; r8: save rdi
+rep insb
+    mov     rdi, r8             ; restore rdi
+    ret
+
+;------------------------------------------------------------------------------
+;  VOID
+;  EFIAPI
+;  IoWriteFifo8 (
+;    IN UINTN                  Port,              // rcx
+;    IN UINTN                  Size,              // rdx
+;    IN VOID                   *Buffer            // r8
+;    );
+;------------------------------------------------------------------------------
+global ASM_PFX(IoWriteFifo8)
+ASM_PFX(IoWriteFifo8):
+
+    xchg    rcx, rdx
+    xchg    rsi, r8             ; rdi: buffer address; r8: save rdi
+rep outsb
+    mov     rsi, r8             ; restore rdi
+    ret
+