mirror of https://github.com/acidanthera/audk.git
Ovmf/Xen: port XenBusDxe to other architectures
This patch updates XenBusDxe to use the 16-bit compare and exchange function that was introduced for this purpose to the BaseSynchronizationLib. It also provides a new generic implementation of TestAndClearBit () using the same 16-bit compare and exchange, making this module fully architecture agnostic. Contributed-under: TianoCore Contribution Agreement 1.0 Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Laszlo Ersek <lersek@redhat.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16975 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel
lersek
parent
b94c3ac93d
commit
e482753b33
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@ -35,9 +35,9 @@
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#include <IndustryStandard/Xen/memory.h>
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#include <Library/XenHypercallLib.h>
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#include <Library/SynchronizationLib.h>
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#include "GrantTable.h"
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#include "InterlockedCompareExchange16.h"
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#define NR_RESERVED_ENTRIES 8
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@ -1,42 +0,0 @@
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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; Module Name:
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;
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; InterlockedCompareExchange16.Asm
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;
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; Abstract:
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;
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; InterlockedCompareExchange16 function
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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SECTION .text
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;------------------------------------------------------------------------------
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; UINT32
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; EFIAPI
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; InternalSyncCompareExchange16 (
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; IN UINT16 *Value,
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; IN UINT16 CompareValue,
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; IN UINT16 ExchangeValue
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalSyncCompareExchange16)
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ASM_PFX(InternalSyncCompareExchange16):
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mov ecx, [esp + 4]
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mov eax, [esp + 8]
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mov edx, [esp + 12]
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lock cmpxchg [ecx], dx
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ret
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@ -1,16 +0,0 @@
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SECTION .text
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; INT32
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; EFIAPI
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; TestAndClearBit (
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; IN INT32 Bit,
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; IN volatile VOID* Address
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; );
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global ASM_PFX(TestAndClearBit)
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ASM_PFX(TestAndClearBit):
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mov ecx, [esp + 4]
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mov edx, [esp + 8]
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lock btr [edx], ecx
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sbb eax, eax
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ret
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@ -1,33 +0,0 @@
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#include <Library/DebugLib.h>
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#include "InterlockedCompareExchange16.h"
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/**
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Performs an atomic compare exchange operation on a 16-bit unsigned integer.
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Performs an atomic compare exchange operation on the 16-bit unsigned integer
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specified by Value. If Value is equal to CompareValue, then Value is set to
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ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
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then Value is returned. The compare exchange operation must be performed using
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MP safe mechanisms.
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If Value is NULL, then ASSERT().
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@param Value A pointer to the 16-bit value for the compare exchange
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operation.
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@param CompareValue 16-bit value used in compare operation.
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@param ExchangeValue 16-bit value used in exchange operation.
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@return The original *Value before exchange.
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**/
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UINT16
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EFIAPI
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InterlockedCompareExchange16 (
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IN OUT UINT16 *Value,
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IN UINT16 CompareValue,
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IN UINT16 ExchangeValue
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)
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{
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ASSERT (Value != NULL);
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return InternalSyncCompareExchange16 (Value, CompareValue, ExchangeValue);
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}
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@ -1,38 +0,0 @@
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/**
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Assembly implementation of InterlockedCompareExchange16.
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Look at the documentation of InterlockedCompareExchange16.
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**/
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UINT16
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EFIAPI
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InternalSyncCompareExchange16 (
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IN volatile UINT16 *Value,
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IN UINT16 CompareValue,
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IN UINT16 ExchangeValue
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);
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/**
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Performs an atomic compare exchange operation on a 16-bit unsigned integer.
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Performs an atomic compare exchange operation on the 16-bit unsigned integer
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specified by Value. If Value is equal to CompareValue, then Value is set to
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ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
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then Value is returned. The compare exchange operation must be performed using
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MP safe mechanisms.
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If Value is NULL, then ASSERT().
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@param Value A pointer to the 16-bit value for the compare exchange
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operation.
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@param CompareValue 16-bit value used in compare operation.
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@param ExchangeValue 16-bit value used in exchange operation.
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@return The original *Value before exchange.
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**/
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UINT16
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EFIAPI
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InterlockedCompareExchange16 (
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IN OUT UINT16 *Value,
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IN UINT16 CompareValue,
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IN UINT16 ExchangeValue
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);
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@ -0,0 +1,45 @@
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/** @file
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Implementation of TestAndClearBit using compare-exchange primitive
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Copyright (C) 2015, Linaro Ltd.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Base.h>
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#include <Library/SynchronizationLib.h>
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INT32
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EFIAPI
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TestAndClearBit (
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IN INT32 Bit,
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IN VOID *Address
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)
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{
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UINT16 Word, Read;
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UINT16 Mask;
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//
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// Calculate the effective address relative to 'Address' based on the
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// higher order bits of 'Bit'. Use signed shift instead of division to
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// ensure we round towards -Inf, and end up with a positive shift in
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// 'Bit', even if 'Bit' itself is negative.
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//
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Address += (Bit >> 4) * sizeof(UINT16);
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Mask = 1U << (Bit & 15);
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for (Word = *(UINT16 *) Address; Word & Mask; Word = Read) {
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Read = InterlockedCompareExchange16 (Address, Word, Word & ~Mask);
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if (Read == Word) {
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return 1;
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}
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}
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return 0;
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}
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@ -1,41 +0,0 @@
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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; Module Name:
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;
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; InterlockedCompareExchange16.Asm
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;
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; Abstract:
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;
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; InterlockedCompareExchange16 function
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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DEFAULT REL
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SECTION .text
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;------------------------------------------------------------------------------
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; UINT16
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; EFIAPI
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; InterlockedCompareExchange16 (
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; IN UINT16 *Value,
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; IN UINT16 CompareValue,
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; IN UINT16 ExchangeValue
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalSyncCompareExchange16)
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ASM_PFX(InternalSyncCompareExchange16):
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mov eax, edx
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lock cmpxchg [rcx], r8w
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ret
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@ -1,15 +0,0 @@
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DEFAULT REL
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SECTION .text
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; INT32
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; EFIAPI
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; TestAndClearBit (
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; IN INT32 Bit, // rcx
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; IN volatile VOID* Address // rdx
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; );
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global ASM_PFX(TestAndClearBit)
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ASM_PFX(TestAndClearBit):
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lock btr [rdx], ecx
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sbb eax, eax
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ret
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@ -122,7 +122,7 @@ INT32
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EFIAPI
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TestAndClearBit (
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IN INT32 Bit,
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IN volatile VOID *Address
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IN VOID *Address
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);
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CHAR8*
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@ -34,8 +34,6 @@
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DriverBinding.h
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ComponentName.c
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ComponentName.h
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InterlockedCompareExchange16.c
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InterlockedCompareExchange16.h
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GrantTable.c
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GrantTable.h
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EventChannel.c
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XenBus.c
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XenBus.h
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Helpers.c
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[Sources.IA32]
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Ia32/InterlockedCompareExchange16.nasm
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Ia32/TestAndClearBit.nasm
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[Sources.X64]
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X64/InterlockedCompareExchange16.nasm
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X64/TestAndClearBit.nasm
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TestAndClearBit.c
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[LibraryClasses]
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UefiDriverEntryPoint
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DevicePathLib
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DebugLib
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XenHypercallLib
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SynchronizationLib
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[Protocols]
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gEfiDriverBindingProtocolGuid
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