mirror of https://github.com/acidanthera/audk.git
OvmfPkg/XenBusDxe: Add InterlockedCompareExchange16.
This patch is inspired by InterlockedCompareExchange32 from the BaseSynchronizationLib. The function will be used in the "OvmfPkg/XenBusDxe: Add Grant Table functions" patch. Change in V3: - Implement both .S and .asm, to get rid of GCC specific asm. - Implement 32bit part of the assembly Change in V2: - Add intel compilation code MSFT code is not compied over because I don't know how it works. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16263 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Anthony PERARD
jljusten
parent
12a16f2d1c
commit
bba9d16231
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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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ASM_GLOBAL ASM_PFX(InternalSyncCompareExchange16)
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ASM_PFX(InternalSyncCompareExchange16):
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mov 4(%esp), %ecx
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mov 8(%esp), %eax
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mov 12(%esp), %edx
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lock
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cmpxchgw %dx, (%ecx)
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ret
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@ -0,0 +1,45 @@
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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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.486
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.model flat,C
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.code
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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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InternalSyncCompareExchange16 PROC
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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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InternalSyncCompareExchange16 ENDP
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END
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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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/**
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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 +1,13 @@
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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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ASM_GLOBAL ASM_PFX(InternalSyncCompareExchange16)
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ASM_PFX(InternalSyncCompareExchange16):
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mov %edx, %eax
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lock
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cmpxchgw %r8w, (%rcx)
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ret
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@ -0,0 +1,41 @@
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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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.code
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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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InternalSyncCompareExchange16 PROC
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mov eax, edx
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lock cmpxchg [rcx], r8w
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ret
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InternalSyncCompareExchange16 ENDP
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END
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@ -36,14 +36,20 @@
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ComponentName.h
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XenHypercall.c
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XenHypercall.h
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InterlockedCompareExchange16.c
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InterlockedCompareExchange16.h
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[Sources.IA32]
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Ia32/hypercall.S
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Ia32/hypercall.asm
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Ia32/InterlockedCompareExchange16.S
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Ia32/InterlockedCompareExchange16.asm
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[Sources.X64]
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X64/hypercall.S
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X64/hypercall.asm
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X64/InterlockedCompareExchange16.S
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X64/InterlockedCompareExchange16.asm
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[LibraryClasses]
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UefiDriverEntryPoint
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