UefiCpuPkg: CpuIo2Dxe: optimize FIFO reads and writes of IO ports

[mirror_edk2.git] / UefiCpuPkg / CpuIo2Dxe / X64 / IoFifo.asm

diff --git a/UefiCpuPkg/CpuIo2Dxe/X64/IoFifo.asm b/UefiCpuPkg/CpuIo2Dxe/X64/IoFifo.asm
new file mode 100644 (file)
index 0000000..1a3f0ef
--- /dev/null
+++ b/UefiCpuPkg/CpuIo2Dxe/X64/IoFifo.asm
@@ -0,0 +1,126 @@
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>\r
+;\r
+; This program and the accompanying materials are licensed and made available\r
+; under the terms and conditions of the BSD License which accompanies this\r
+; distribution.  The full text of the license may be found at\r
+; http://opensource.org/licenses/bsd-license.php.\r
+;\r
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    .code\r
+\r
+;------------------------------------------------------------------------------\r
+;  VOID\r
+;  EFIAPI\r
+;  IoReadFifo8 (\r
+;    IN UINTN                  Port,              // rcx\r
+;    IN UINTN                  Size,              // rdx\r
+;    IN VOID                   *Buffer            // r8\r
+;    );\r
+;------------------------------------------------------------------------------\r
+IoReadFifo8 PROC\r
+    cld\r
+    xchg    rcx, rdx\r
+    xchg    rdi, r8             ; rdi: buffer address; r8: save rdi\r
+rep insb\r
+    mov     rdi, r8             ; restore rdi\r
+    ret\r
+IoReadFifo8 ENDP\r
+\r
+;------------------------------------------------------------------------------\r
+;  VOID\r
+;  EFIAPI\r
+;  IoReadFifo16 (\r
+;    IN UINTN                  Port,              // rcx\r
+;    IN UINTN                  Size,              // rdx\r
+;    IN VOID                   *Buffer            // r8\r
+;    );\r
+;------------------------------------------------------------------------------\r
+IoReadFifo16 PROC\r
+    cld\r
+    xchg    rcx, rdx\r
+    xchg    rdi, r8             ; rdi: buffer address; r8: save rdi\r
+rep insw\r
+    mov     rdi, r8             ; restore rdi\r
+    ret\r
+IoReadFifo16 ENDP\r
+\r
+;------------------------------------------------------------------------------\r
+;  VOID\r
+;  EFIAPI\r
+;  IoReadFifo32 (\r
+;    IN UINTN                  Port,              // rcx\r
+;    IN UINTN                  Size,              // rdx\r
+;    IN VOID                   *Buffer            // r8\r
+;    );\r
+;------------------------------------------------------------------------------\r
+IoReadFifo32 PROC\r
+    cld\r
+    xchg    rcx, rdx\r
+    xchg    rdi, r8             ; rdi: buffer address; r8: save rdi\r
+rep insd\r
+    mov     rdi, r8             ; restore rdi\r
+    ret\r
+IoReadFifo32 ENDP\r
+\r
+;------------------------------------------------------------------------------\r
+;  VOID\r
+;  EFIAPI\r
+;  IoWriteFifo8 (\r
+;    IN UINTN                  Port,              // rcx\r
+;    IN UINTN                  Size,              // rdx\r
+;    IN VOID                   *Buffer            // r8\r
+;    );\r
+;------------------------------------------------------------------------------\r
+IoWriteFifo8 PROC\r
+    cld\r
+    xchg    rcx, rdx\r
+    xchg    rsi, r8             ; rsi: buffer address; r8: save rsi\r
+rep outsb\r
+    mov     rsi, r8             ; restore rsi\r
+    ret\r
+IoWriteFifo8 ENDP\r
+\r
+;------------------------------------------------------------------------------\r
+;  VOID\r
+;  EFIAPI\r
+;  IoWriteFifo16 (\r
+;    IN UINTN                  Port,              // rcx\r
+;    IN UINTN                  Size,              // rdx\r
+;    IN VOID                   *Buffer            // r8\r
+;    );\r
+;------------------------------------------------------------------------------\r
+IoWriteFifo16 PROC\r
+    cld\r
+    xchg    rcx, rdx\r
+    xchg    rsi, r8             ; rsi: buffer address; r8: save rsi\r
+rep outsw\r
+    mov     rsi, r8             ; restore rsi\r
+    ret\r
+IoWriteFifo16 ENDP\r
+\r
+;------------------------------------------------------------------------------\r
+;  VOID\r
+;  EFIAPI\r
+;  IoWriteFifo32 (\r
+;    IN UINTN                  Port,              // rcx\r
+;    IN UINTN                  Size,              // rdx\r
+;    IN VOID                   *Buffer            // r8\r
+;    );\r
+;------------------------------------------------------------------------------\r
+IoWriteFifo32 PROC\r
+    cld\r
+    xchg    rcx, rdx\r
+    xchg    rsi, r8             ; rsi: buffer address; r8: save rsi\r
+rep outsd\r
+    mov     rsi, r8             ; restore rsi\r
+    ret\r
+IoWriteFifo32 ENDP\r
+\r
+    END\r
+\r