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206 lines
6.1 KiB
206 lines
6.1 KiB
4 years ago
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; Implementation of synchronization functions for ARM architecture (AArch64)
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;
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; Copyright (c) 2012-2015, ARM Limited. All rights reserved.
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; Copyright (c) 2015, Linaro Limited. All rights reserved.
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;
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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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;
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EXPORT InternalSyncCompareExchange16
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EXPORT InternalSyncCompareExchange32
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EXPORT InternalSyncCompareExchange64
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EXPORT InternalSyncIncrement
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EXPORT InternalSyncDecrement
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AREA BaseSynchronizationLib_LowLevel, CODE, READONLY
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;/**
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; Performs an atomic compare exchange operation on a 16-bit unsigned integer.
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;
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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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;
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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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;
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; @return The original *Value before exchange.
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;
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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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InternalSyncCompareExchange16
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uxth w1, w1
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uxth w2, w2
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dmb sy
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InternalSyncCompareExchange16Again
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ldxrh w3, [x0]
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cmp w3, w1
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bne InternalSyncCompareExchange16Fail
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InternalSyncCompareExchange16Exchange
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stxrh w4, w2, [x0]
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cbnz w4, InternalSyncCompareExchange16Again
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InternalSyncCompareExchange16Fail
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dmb sy
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mov w0, w3
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ret
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;/**
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; Performs an atomic compare exchange operation on a 32-bit unsigned integer.
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;
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; Performs an atomic compare exchange operation on the 32-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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;
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; @param Value A pointer to the 32-bit value for the compare exchange
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; operation.
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; @param CompareValue 32-bit value used in compare operation.
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; @param ExchangeValue 32-bit value used in exchange operation.
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;
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; @return The original *Value before exchange.
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;
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;**/
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;UINT32
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;EFIAPI
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;InternalSyncCompareExchange32 (
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; IN volatile UINT32 *Value,
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; IN UINT32 CompareValue,
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; IN UINT32 ExchangeValue
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; )
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InternalSyncCompareExchange32
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dmb sy
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InternalSyncCompareExchange32Again
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ldxr w3, [x0]
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cmp w3, w1
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bne InternalSyncCompareExchange32Fail
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InternalSyncCompareExchange32Exchange
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stxr w4, w2, [x0]
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cbnz w4, InternalSyncCompareExchange32Again
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InternalSyncCompareExchange32Fail
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dmb sy
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mov w0, w3
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ret
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;/**
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; Performs an atomic compare exchange operation on a 64-bit unsigned integer.
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;
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; Performs an atomic compare exchange operation on the 64-bit unsigned integer specified
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; by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and
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; CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.
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; The compare exchange operation must be performed using MP safe mechanisms.
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;
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; @param Value A pointer to the 64-bit value for the compare exchange
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; operation.
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; @param CompareValue 64-bit value used in compare operation.
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; @param ExchangeValue 64-bit value used in exchange operation.
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;
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; @return The original *Value before exchange.
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;
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;**/
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;UINT64
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;EFIAPI
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;InternalSyncCompareExchange64 (
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; IN volatile UINT64 *Value,
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; IN UINT64 CompareValue,
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; IN UINT64 ExchangeValue
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; )
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InternalSyncCompareExchange64
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dmb sy
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InternalSyncCompareExchange64Again
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ldxr x3, [x0]
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cmp x3, x1
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bne InternalSyncCompareExchange64Fail
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InternalSyncCompareExchange64Exchange
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stxr w4, x2, [x0]
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cbnz w4, InternalSyncCompareExchange64Again
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InternalSyncCompareExchange64Fail
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dmb sy
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mov x0, x3
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ret
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;/**
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; Performs an atomic increment of an 32-bit unsigned integer.
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;
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; Performs an atomic increment of the 32-bit unsigned integer specified by
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; Value and returns the incremented value. The increment operation must be
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; performed using MP safe mechanisms. The state of the return value is not
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; guaranteed to be MP safe.
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;
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; @param Value A pointer to the 32-bit value to increment.
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;
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; @return The incremented value.
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;
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;**/
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;UINT32
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;EFIAPI
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;InternalSyncIncrement (
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; IN volatile UINT32 *Value
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; )
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InternalSyncIncrement
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dmb sy
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TryInternalSyncIncrement
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ldxr w1, [x0]
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add w1, w1, #1
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stxr w2, w1, [x0]
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cbnz w2, TryInternalSyncIncrement
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mov w0, w1
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dmb sy
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ret
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;/**
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; Performs an atomic decrement of an 32-bit unsigned integer.
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;
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; Performs an atomic decrement of the 32-bit unsigned integer specified by
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; Value and returns the decrement value. The decrement operation must be
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; performed using MP safe mechanisms. The state of the return value is not
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; guaranteed to be MP safe.
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;
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; @param Value A pointer to the 32-bit value to decrement.
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;
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; @return The decrement value.
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;
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;**/
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;UINT32
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;EFIAPI
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;InternalSyncDecrement (
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; IN volatile UINT32 *Value
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; )
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InternalSyncDecrement
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dmb sy
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TryInternalSyncDecrement
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ldxr w1, [x0]
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sub w1, w1, #1
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stxr w2, w1, [x0]
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cbnz w2, TryInternalSyncDecrement
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mov w0, w1
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dmb sy
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ret
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END
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