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

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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
This commit is contained in:
jljusten
2012-06-01 17:07:00 +00:00
parent 2ea3b92055
commit 1fd376d979
7 changed files with 747 additions and 0 deletions
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121
PcAtChipsetPkg/PciHostBridgeDxe/X64/IoFifo.S Normal file
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#------------------------------------------------------------------------------
#
# 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.
#
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# VOID
# EFIAPI
# IoReadFifo8 (
# IN UINTN Port, // rcx
# IN UINTN Count, // rdx
# IN VOID *Buffer // r8
# );
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(IoReadFifo8)
ASM_PFX(IoReadFifo8):
cld
xchg %rcx, %rdx
xchg %r8, %rdi # rdi: buffer address; r8: save register
rep insb
mov %r8, %rdi # restore rdi
ret
#------------------------------------------------------------------------------
# VOID
# EFIAPI
# IoReadFifo16 (
# IN UINTN Port, // rcx
# IN UINTN Count, // rdx
# IN VOID *Buffer // r8
# );
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(IoReadFifo16)
ASM_PFX(IoReadFifo16):
cld
xchg %rcx, %rdx
xchg %r8, %rdi # rdi: buffer address; r8: save register
rep insw
mov %r8, %rdi # restore rdi
ret
#------------------------------------------------------------------------------
# VOID
# EFIAPI
# IoReadFifo32 (
# IN UINTN Port, // rcx
# IN UINTN Count, // rdx
# IN VOID *Buffer // r8
# );
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(IoReadFifo32)
ASM_PFX(IoReadFifo32):
cld
xchg %rcx, %rdx
xchg %r8, %rdi # rdi: buffer address; r8: save register
rep insl
mov %r8, %rdi # restore rdi
ret
#------------------------------------------------------------------------------
# VOID
# EFIAPI
# IoWriteFifo8 (
# IN UINTN Port, // rcx
# IN UINTN Count, // rdx
# IN VOID *Buffer // r8
# );
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(IoWriteFifo8)
ASM_PFX(IoWriteFifo8):
cld
xchg %rcx, %rdx
xchg %r8, %rsi # rsi: buffer address; r8: save register
rep outsb
mov %r8, %rsi # restore rsi
ret
#------------------------------------------------------------------------------
# VOID
# EFIAPI
# IoWriteFifo16 (
# IN UINTN Port, // rcx
# IN UINTN Count, // rdx
# IN VOID *Buffer // r8
# );
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(IoWriteFifo16)
ASM_PFX(IoWriteFifo16):
cld
xchg %rcx, %rdx
xchg %r8, %rsi # rsi: buffer address; r8: save register
rep outsw
mov %r8, %rsi # restore rsi
ret
#------------------------------------------------------------------------------
# VOID
# EFIAPI
# IoWriteFifo32 (
# IN UINTN Port, // rcx
# IN UINTN Count, // rdx
# IN VOID *Buffer // r8
# );
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(IoWriteFifo32)
ASM_PFX(IoWriteFifo32):
cld
xchg %rcx, %rdx
xchg %r8, %rsi # rsi: buffer address; r8: save register
rep outsl
mov %r8, %rsi # restore rsi
ret