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audk/PcAtChipsetPkg/PciHostBridgeDxe/X64/IoFifo.asm

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PcAtChipsetPkg/PciHostBridgeDxe: Improve KVM FIFO I/O read/write performance KVM can substantially boost the speed of the rep insb/insw/insl and rep outsb/outsw/outsl instructions by transferring up to a page of data per VM trap. This change adds assembly handling of the PCI Host Bridge I/O FIFO Reads and Writes. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com> git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13424 6f19259b-4bc3-4df7-8a09-765794883524
2012-06-01 19:07:00 +02:00
;------------------------------------------------------------------------------
;
; 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