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

* Short description:

  The CpuIoServiceRead() and CpuIoServiceWrite() functions transfer data
  between memory and IO ports with individual Io(Read|Write)(8|16|32)
  function calls, each in an appropriately set up loop.

  On the Ia32 and X64 platforms however, FIFO reads and writes can be
  optimized, by coding them in assembly, and delegating the loop to the
  CPU, with the REP prefix.

  On KVM virtualization hosts, this difference has a huge performance
  impact: if the loop is open-coded, then the virtual machine traps to the
  hypervisor on every single UINT8 / UINT16 / UINT32 transfer, whereas
  with the REP prefix, KVM can transfer up to a page of data per VM trap.
  This is especially noticeable with IDE PIO transfers, where all the data
  are squeezed through IO ports.

* Long description:

  The RootBridgeIoIoRW() function in

    PcAtChipsetPkg/PciHostBridgeDxe/PciRootBridgeIo.c

  used to have the exact same IO port acces optimization, dating back
  verbatim to commit 1fd376d9792:

    PcAtChipsetPkg/PciHostBridgeDxe: Improve KVM FIFO I/O read/write
      performance

  OvmfPkg cloned the "PcAtChipsetPkg/PciHostBridgeDxe" driver (for
  unrelated reasons), and inherited the optimization from PcAtChipsetPkg.

  The "PcAtChipsetPkg/PciHostBridgeDxe" driver was ultimately removed in
  commit 111d79db47:

    PcAtChipsetPkg/PciHostBridge: Remove PciHostBridge driver

  and OvmfPkg too was rebased to the new core Pci Host Bridge Driver, in
  commit 4014885ffd:

    OvmfPkg: switch to MdeModulePkg/Bus/Pci/PciHostBridgeDxe

  This caused the optimization to go lost. Namely, the
  RootBridgeIoIoRead() and RootBridgeIoIoWrite() functions in the new core
  Pci Host Bridge Driver delegate IO port accesses to
  EFI_CPU_IO2_PROTOCOL. And, in OvmfPkg (and likely most other Ia32 / X64
  edk2 platforms), this protocol is provided by "UefiCpuPkg/CpuIo2Dxe",
  which lacks the optimization.

  Therefore, this patch ports the C source code logic from commit
  1fd376d979 (see above) to "UefiCpuPkg/CpuIo2Dxe", plus it ports the
  NASM-converted assembly helper functions from OvmfPkg commits
  6026bf4600 and ace1d0517b65:

    OvmfPkg PciHostBridgeDxe: Convert Ia32/IoFifo.asm to NASM

    OvmfPkg PciHostBridgeDxe: Convert X64/IoFifo.asm to NASM

  In order to support the MSFT and INTEL toolchains as well, the *.asm
  files are ported from OvmfPkg as well, immediately from before the above
  conversion (that is, at 6026bf460037^).

* Notes about the port:

  - The write and read branches from commit 1fd376d979 are split to the
    separate functions CpuIoServiceWrite() and CpuIoServiceRead().

  - The EfiPciWidthUintXX constants are replaced with EfiCpuIoWidthUintXX.

  - The cast expression "(UINTN) Address" is replaced with
    "(UINTN)Address" (i.e., no space), because that's how the receiving
    functions spell it as well.

  - The labels in the switch statements are unindented by one level, to
    match the edk2 coding style (and the rest of UefiCpuPkg) better.

* The first signoff belongs to Jordan, because he authored all of
  1fd376d979, 6026bf4600 and ace1d0517b.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Ref: https://www.redhat.com/archives/vfio-users/2016-April/msg00029.html
Reported-by: Mark <kram321@gmail.com>
Ref: http://thread.gmane.org/gmane.comp.bios.edk2.devel/10424/focus=10432
Reported-by: Jordan Justen <jordan.l.justen@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jeff Fan <jeff.fan@intel.com>
Cc: Mark <kram321@gmail.com>
Tested-by: Mark <kram321@gmail.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
This commit is contained in:
Laszlo Ersek 2016-04-07 22:28:38 +02:00
parent 7a9395cd7b
commit fb8b54694c
7 changed files with 763 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
UefiCpuPkg/CpuIo2Dxe/CpuIo2Dxe.c
View File

@ -13,6 +13,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "CpuIo2Dxe.h"
#include "IoFifo.h"
//
// Handle for the CPU I/O 2 Protocol
@ -410,6 +411,30 @@ CpuIoServiceRead (
InStride = mInStride[Width];
OutStride = mOutStride[Width];
OperationWidth = (EFI_CPU_IO_PROTOCOL_WIDTH) (Width & 0x03);
#if defined (MDE_CPU_IA32) || defined (MDE_CPU_X64)
if (InStride == 0) {
switch (OperationWidth) {
case EfiCpuIoWidthUint8:
IoReadFifo8 ((UINTN)Address, Count, Buffer);
return EFI_SUCCESS;
case EfiCpuIoWidthUint16:
IoReadFifo16 ((UINTN)Address, Count, Buffer);
return EFI_SUCCESS;
case EfiCpuIoWidthUint32:
IoReadFifo32 ((UINTN)Address, Count, Buffer);
return EFI_SUCCESS;
default:
//
// The CpuIoCheckParameter call above will ensure that this
// path is not taken.
//
ASSERT (FALSE);
break;
}
}
#endif
for (Uint8Buffer = Buffer; Count > 0; Address += InStride, Uint8Buffer += OutStride, Count--) {
if (OperationWidth == EfiCpuIoWidthUint8) {
*Uint8Buffer = IoRead8 ((UINTN)Address);
@ -492,6 +517,30 @@ CpuIoServiceWrite (
InStride = mInStride[Width];
OutStride = mOutStride[Width];
OperationWidth = (EFI_CPU_IO_PROTOCOL_WIDTH) (Width & 0x03);
#if defined (MDE_CPU_IA32) || defined (MDE_CPU_X64)
if (InStride == 0) {
switch (OperationWidth) {
case EfiCpuIoWidthUint8:
IoWriteFifo8 ((UINTN)Address, Count, Buffer);
return EFI_SUCCESS;
case EfiCpuIoWidthUint16:
IoWriteFifo16 ((UINTN)Address, Count, Buffer);
return EFI_SUCCESS;
case EfiCpuIoWidthUint32:
IoWriteFifo32 ((UINTN)Address, Count, Buffer);
return EFI_SUCCESS;
default:
//
// The CpuIoCheckParameter call above will ensure that this
// path is not taken.
//
ASSERT (FALSE);
break;
}
}
#endif
for (Uint8Buffer = (UINT8 *)Buffer; Count > 0; Address += InStride, Uint8Buffer += OutStride, Count--) {
if (OperationWidth == EfiCpuIoWidthUint8) {
IoWrite8 ((UINTN)Address, *Uint8Buffer);

11
UefiCpuPkg/CpuIo2Dxe/CpuIo2Dxe.inf
View File

@ -30,7 +30,18 @@
[Sources]
CpuIo2Dxe.c
CpuIo2Dxe.h
IoFifo.h
[Sources.IA32]
Ia32/IoFifo.nasm | GCC
Ia32/IoFifo.asm | MSFT
Ia32/IoFifo.asm | INTEL
[Sources.X64]
X64/IoFifo.nasm | GCC
X64/IoFifo.asm | MSFT
X64/IoFifo.asm | INTEL
[Packages]
MdePkg/MdePkg.dec

140
UefiCpuPkg/CpuIo2Dxe/Ia32/IoFifo.asm Normal file
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@ -0,0 +1,140 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2012, 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.
;
;------------------------------------------------------------------------------
.586P
.model flat,C
.code
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo8 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
IoReadFifo8 PROC
push edi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov edi, [esp + 16]
rep insb
pop edi
ret
IoReadFifo8 ENDP
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo16 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
IoReadFifo16 PROC
push edi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov edi, [esp + 16]
rep insw
pop edi
ret
IoReadFifo16 ENDP
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo32 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
IoReadFifo32 PROC
push edi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov edi, [esp + 16]
rep insd
pop edi
ret
IoReadFifo32 ENDP
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo8 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
IoWriteFifo8 PROC
push esi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov esi, [esp + 16]
rep outsb
pop esi
ret
IoWriteFifo8 ENDP
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo16 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
IoWriteFifo16 PROC
push esi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov esi, [esp + 16]
rep outsw
pop esi
ret
IoWriteFifo16 ENDP
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo32 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
IoWriteFifo32 PROC
push esi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov esi, [esp + 16]
rep outsd
pop esi
ret
IoWriteFifo32 ENDP
END

136
UefiCpuPkg/CpuIo2Dxe/Ia32/IoFifo.nasm Normal file
View File

@ -0,0 +1,136 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2012, 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.
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo8 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
global ASM_PFX(IoReadFifo8)
ASM_PFX(IoReadFifo8):
push edi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov edi, [esp + 16]
rep insb
pop edi
ret
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo16 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
global ASM_PFX(IoReadFifo16)
ASM_PFX(IoReadFifo16):
push edi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov edi, [esp + 16]
rep insw
pop edi
ret
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo32 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
global ASM_PFX(IoReadFifo32)
ASM_PFX(IoReadFifo32):
push edi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov edi, [esp + 16]
rep insd
pop edi
ret
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo8 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
global ASM_PFX(IoWriteFifo8)
ASM_PFX(IoWriteFifo8):
push esi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov esi, [esp + 16]
rep outsb
pop esi
ret
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo16 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
global ASM_PFX(IoWriteFifo16)
ASM_PFX(IoWriteFifo16):
push esi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov esi, [esp + 16]
rep outsw
pop esi
ret
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo32 (
; IN UINTN Port,
; IN UINTN Size,
; IN VOID *Buffer
; );
;------------------------------------------------------------------------------
global ASM_PFX(IoWriteFifo32)
ASM_PFX(IoWriteFifo32):
push esi
cld
mov dx, [esp + 8]
mov ecx, [esp + 12]
mov esi, [esp + 16]
rep outsd
pop esi
ret

176
UefiCpuPkg/CpuIo2Dxe/IoFifo.h Normal file
View File

@ -0,0 +1,176 @@
/** @file
I/O FIFO routines
Copyright (c) 2008 - 2012, 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.
**/
#ifndef _IO_FIFO_H_INCLUDED_
#define _IO_FIFO_H_INCLUDED_
/**
Reads an 8-bit I/O port fifo into a block of memory.
Reads the 8-bit I/O fifo port specified by Port.
The port is read Count times, and the read data is
stored in the provided Buffer.
This function must guarantee that all I/O read and write operations are
serialized.
If 8-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to read.
@param Count The number of times to read I/O port.
@param Buffer The buffer to store the read data into.
**/
VOID
EFIAPI
IoReadFifo8 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
);
/**
Reads a 16-bit I/O port fifo into a block of memory.
Reads the 16-bit I/O fifo port specified by Port.
The port is read Count times, and the read data is
stored in the provided Buffer.
This function must guarantee that all I/O read and write operations are
serialized.
If 16-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to read.
@param Count The number of times to read I/O port.
@param Buffer The buffer to store the read data into.
**/
VOID
EFIAPI
IoReadFifo16 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
);
/**
Reads a 32-bit I/O port fifo into a block of memory.
Reads the 32-bit I/O fifo port specified by Port.
The port is read Count times, and the read data is
stored in the provided Buffer.
This function must guarantee that all I/O read and write operations are
serialized.
If 32-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to read.
@param Count The number of times to read I/O port.
@param Buffer The buffer to store the read data into.
**/
VOID
EFIAPI
IoReadFifo32 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
);
/**
Writes a block of memory into an 8-bit I/O port fifo.
Writes the 8-bit I/O fifo port specified by Port.
The port is written Count times, and the write data is
retrieved from the provided Buffer.
This function must guarantee that all I/O write and write operations are
serialized.
If 8-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to write.
@param Count The number of times to write I/O port.
@param Buffer The buffer to store the write data into.
**/
VOID
EFIAPI
IoWriteFifo8 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
);
/**
Writes a block of memory into a 16-bit I/O port fifo.
Writes the 16-bit I/O fifo port specified by Port.
The port is written Count times, and the write data is
retrieved from the provided Buffer.
This function must guarantee that all I/O write and write operations are
serialized.
If 16-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to write.
@param Count The number of times to write I/O port.
@param Buffer The buffer to store the write data into.
**/
VOID
EFIAPI
IoWriteFifo16 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
);
/**
Writes a block of memory into a 32-bit I/O port fifo.
Writes the 32-bit I/O fifo port specified by Port.
The port is written Count times, and the write data is
retrieved from the provided Buffer.
This function must guarantee that all I/O write and write operations are
serialized.
If 32-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to write.
@param Count The number of times to write I/O port.
@param Buffer The buffer to store the write data into.
**/
VOID
EFIAPI
IoWriteFifo32 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
);
#endif

126
UefiCpuPkg/CpuIo2Dxe/X64/IoFifo.asm Normal file
View File

@ -0,0 +1,126 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2012, 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.
;
;------------------------------------------------------------------------------
.code
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo8 (
; IN UINTN Port, // rcx
; IN UINTN Size, // rdx
; IN VOID *Buffer // r8
; );
;------------------------------------------------------------------------------
IoReadFifo8 PROC
cld
xchg rcx, rdx
xchg rdi, r8 ; rdi: buffer address; r8: save rdi
rep insb
mov rdi, r8 ; restore rdi
ret
IoReadFifo8 ENDP
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo16 (
; IN UINTN Port, // rcx
; IN UINTN Size, // rdx
; IN VOID *Buffer // r8
; );
;------------------------------------------------------------------------------
IoReadFifo16 PROC
cld
xchg rcx, rdx
xchg rdi, r8 ; rdi: buffer address; r8: save rdi
rep insw
mov rdi, r8 ; restore rdi
ret
IoReadFifo16 ENDP
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo32 (
; IN UINTN Port, // rcx
; IN UINTN Size, // rdx
; IN VOID *Buffer // r8
; );
;------------------------------------------------------------------------------
IoReadFifo32 PROC
cld
xchg rcx, rdx
xchg rdi, r8 ; rdi: buffer address; r8: save rdi
rep insd
mov rdi, r8 ; restore rdi
ret
IoReadFifo32 ENDP
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo8 (
; IN UINTN Port, // rcx
; IN UINTN Size, // rdx
; IN VOID *Buffer // r8
; );
;------------------------------------------------------------------------------
IoWriteFifo8 PROC
cld
xchg rcx, rdx
xchg rsi, r8 ; rsi: buffer address; r8: save rsi
rep outsb
mov rsi, r8 ; restore rsi
ret
IoWriteFifo8 ENDP
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo16 (
; IN UINTN Port, // rcx
; IN UINTN Size, // rdx
; IN VOID *Buffer // r8
; );
;------------------------------------------------------------------------------
IoWriteFifo16 PROC
cld
xchg rcx, rdx
xchg rsi, r8 ; rsi: buffer address; r8: save rsi
rep outsw
mov rsi, r8 ; restore rsi
ret
IoWriteFifo16 ENDP
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo32 (
; IN UINTN Port, // rcx
; IN UINTN Size, // rdx
; IN VOID *Buffer // r8
; );
;------------------------------------------------------------------------------
IoWriteFifo32 PROC
cld
xchg rcx, rdx
xchg rsi, r8 ; rsi: buffer address; r8: save rsi
rep outsd
mov rsi, r8 ; restore rsi
ret
IoWriteFifo32 ENDP
END

125
UefiCpuPkg/CpuIo2Dxe/X64/IoFifo.nasm Normal file
View File

@ -0,0 +1,125 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2012, 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):
cld
xchg rcx, rdx
xchg rdi, r8 ; rdi: buffer address; r8: save rdi
rep insb
mov rdi, r8 ; restore rdi
ret
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo16 (
; IN UINTN Port, // rcx
; IN UINTN Size, // rdx
; IN VOID *Buffer // r8
; );
;------------------------------------------------------------------------------
global ASM_PFX(IoReadFifo16)
ASM_PFX(IoReadFifo16):
cld
xchg rcx, rdx
xchg rdi, r8 ; rdi: buffer address; r8: save rdi
rep insw
mov rdi, r8 ; restore rdi
ret
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoReadFifo32 (
; IN UINTN Port, // rcx
; IN UINTN Size, // rdx
; IN VOID *Buffer // r8
; );
;------------------------------------------------------------------------------
global ASM_PFX(IoReadFifo32)
ASM_PFX(IoReadFifo32):
cld
xchg rcx, rdx
xchg rdi, r8 ; rdi: buffer address; r8: save rdi
rep insd
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):
cld
xchg rcx, rdx
xchg rsi, r8 ; rsi: buffer address; r8: save rsi
rep outsb
mov rsi, r8 ; restore rsi
ret
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo16 (
; IN UINTN Port, // rcx
; IN UINTN Size, // rdx
; IN VOID *Buffer // r8
; );
;------------------------------------------------------------------------------
global ASM_PFX(IoWriteFifo16)
ASM_PFX(IoWriteFifo16):
cld
xchg rcx, rdx
xchg rsi, r8 ; rsi: buffer address; r8: save rsi
rep outsw
mov rsi, r8 ; restore rsi
ret
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; IoWriteFifo32 (
; IN UINTN Port, // rcx
; IN UINTN Size, // rdx
; IN VOID *Buffer // r8
; );
;------------------------------------------------------------------------------
global ASM_PFX(IoWriteFifo32)
ASM_PFX(IoWriteFifo32):
cld
xchg rcx, rdx
xchg rsi, r8 ; rsi: buffer address; r8: save rsi
rep outsd
mov rsi, r8 ; restore rsi
ret