4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync/** @file
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Implementation of synchronization functions on Itanium.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync This program and the accompanying materials
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync are licensed and made available under the terms and conditions of the BSD License
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync which accompanies this distribution. The full text of the license may be found at
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync http://opensource.org/licenses/bsd-license.php.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync**/
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#include "BaseSynchronizationLibInternals.h"
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync/**
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Performs an atomic increment of an 32-bit unsigned integer.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Performs an atomic increment of the 32-bit unsigned integer specified by
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Value and returns the incremented value. The increment operation must be
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync performed using MP safe mechanisms. The state of the return value is not
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync guaranteed to be MP safe.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param Value A pointer to the 32-bit value to increment.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @return The incremented value.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync**/
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncUINT32
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncEFIAPI
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncInternalSyncIncrement (
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IN volatile UINT32 *Value
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync )
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync{
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync UINT32 OriginalValue;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync do {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync OriginalValue = *Value;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync } while (OriginalValue != InternalSyncCompareExchange32 (
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Value,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync OriginalValue,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync OriginalValue + 1
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync return OriginalValue + 1;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync}
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync/**
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Performs an atomic decrement of an 32-bit unsigned integer.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Performs an atomic decrement of the 32-bit unsigned integer specified by
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Value and returns the decrement value. The decrement operation must be
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync performed using MP safe mechanisms. The state of the return value is not
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync guaranteed to be MP safe.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param Value A pointer to the 32-bit value to decrement.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @return The decrement value.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync**/
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncUINT32
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncEFIAPI
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncInternalSyncDecrement (
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IN volatile UINT32 *Value
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync )
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync{
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync UINT32 OriginalValue;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync do {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync OriginalValue = *Value;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync } while (OriginalValue != InternalSyncCompareExchange32 (
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Value,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync OriginalValue,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync OriginalValue - 1
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync return OriginalValue - 1;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync}