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-rw-r--r--MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S8
-rw-r--r--MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.asm199
2 files changed, 200 insertions, 7 deletions
diff --git a/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S b/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S
index 2edd526605c6..8c9f39f21615 100644
--- a/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S
+++ b/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S
@@ -3,13 +3,7 @@
// Copyright (c) 2012-2015, ARM Limited. All rights reserved.
// Copyright (c) 2015, Linaro Limited. All rights reserved.
//
-// 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.
+// SPDX-License-Identifier: BSD-2-Clause-Patent
//
//
diff --git a/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.asm b/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.asm
new file mode 100644
index 000000000000..8209947f80df
--- /dev/null
+++ b/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.asm
@@ -0,0 +1,199 @@
+; Implementation of synchronization functions for ARM architecture (AArch64)
+;
+; Copyright (c) 2012-2015, ARM Limited. All rights reserved.
+; Copyright (c) 2015, Linaro Limited. All rights reserved.
+;
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+;
+
+ EXPORT InternalSyncCompareExchange16
+ EXPORT InternalSyncCompareExchange32
+ EXPORT InternalSyncCompareExchange64
+ EXPORT InternalSyncIncrement
+ EXPORT InternalSyncDecrement
+ AREA BaseSynchronizationLib_LowLevel, CODE, READONLY
+
+;/**
+; Performs an atomic compare exchange operation on a 16-bit unsigned integer.
+;
+; Performs an atomic compare exchange operation on the 16-bit unsigned integer
+; specified by Value. If Value is equal to CompareValue, then Value is set to
+; ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
+; then Value is returned. The compare exchange operation must be performed using
+; MP safe mechanisms.
+;
+; @param Value A pointer to the 16-bit value for the compare exchange
+; operation.
+; @param CompareValue 16-bit value used in compare operation.
+; @param ExchangeValue 16-bit value used in exchange operation.
+;
+; @return The original *Value before exchange.
+;
+;**/
+;UINT16
+;EFIAPI
+;InternalSyncCompareExchange16 (
+; IN volatile UINT16 *Value,
+; IN UINT16 CompareValue,
+; IN UINT16 ExchangeValue
+; )
+InternalSyncCompareExchange16
+ uxth w1, w1
+ uxth w2, w2
+ dmb sy
+
+InternalSyncCompareExchange16Again
+ ldxrh w3, [x0]
+ cmp w3, w1
+ bne InternalSyncCompareExchange16Fail
+
+InternalSyncCompareExchange16Exchange
+ stxrh w4, w2, [x0]
+ cbnz w4, InternalSyncCompareExchange16Again
+
+InternalSyncCompareExchange16Fail
+ dmb sy
+ mov w0, w3
+ ret
+
+;/**
+; Performs an atomic compare exchange operation on a 32-bit unsigned integer.
+;
+; Performs an atomic compare exchange operation on the 32-bit unsigned integer
+; specified by Value. If Value is equal to CompareValue, then Value is set to
+; ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
+; then Value is returned. The compare exchange operation must be performed using
+; MP safe mechanisms.
+;
+; @param Value A pointer to the 32-bit value for the compare exchange
+; operation.
+; @param CompareValue 32-bit value used in compare operation.
+; @param ExchangeValue 32-bit value used in exchange operation.
+;
+; @return The original *Value before exchange.
+;
+;**/
+;UINT32
+;EFIAPI
+;InternalSyncCompareExchange32 (
+; IN volatile UINT32 *Value,
+; IN UINT32 CompareValue,
+; IN UINT32 ExchangeValue
+; )
+InternalSyncCompareExchange32
+ dmb sy
+
+InternalSyncCompareExchange32Again
+ ldxr w3, [x0]
+ cmp w3, w1
+ bne InternalSyncCompareExchange32Fail
+
+InternalSyncCompareExchange32Exchange
+ stxr w4, w2, [x0]
+ cbnz w4, InternalSyncCompareExchange32Again
+
+InternalSyncCompareExchange32Fail
+ dmb sy
+ mov w0, w3
+ ret
+
+;/**
+; Performs an atomic compare exchange operation on a 64-bit unsigned integer.
+;
+; Performs an atomic compare exchange operation on the 64-bit unsigned integer specified
+; by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and
+; CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.
+; The compare exchange operation must be performed using MP safe mechanisms.
+;
+; @param Value A pointer to the 64-bit value for the compare exchange
+; operation.
+; @param CompareValue 64-bit value used in compare operation.
+; @param ExchangeValue 64-bit value used in exchange operation.
+;
+; @return The original *Value before exchange.
+;
+;**/
+;UINT64
+;EFIAPI
+;InternalSyncCompareExchange64 (
+; IN volatile UINT64 *Value,
+; IN UINT64 CompareValue,
+; IN UINT64 ExchangeValue
+; )
+InternalSyncCompareExchange64
+ dmb sy
+
+InternalSyncCompareExchange64Again
+ ldxr x3, [x0]
+ cmp x3, x1
+ bne InternalSyncCompareExchange64Fail
+
+InternalSyncCompareExchange64Exchange
+ stxr w4, x2, [x0]
+ cbnz w4, InternalSyncCompareExchange64Again
+
+InternalSyncCompareExchange64Fail
+ dmb sy
+ mov x0, x3
+ ret
+
+;/**
+; Performs an atomic increment of an 32-bit unsigned integer.
+;
+; Performs an atomic increment of the 32-bit unsigned integer specified by
+; Value and returns the incremented value. The increment operation must be
+; performed using MP safe mechanisms. The state of the return value is not
+; guaranteed to be MP safe.
+;
+; @param Value A pointer to the 32-bit value to increment.
+;
+; @return The incremented value.
+;
+;**/
+;UINT32
+;EFIAPI
+;InternalSyncIncrement (
+; IN volatile UINT32 *Value
+; )
+InternalSyncIncrement
+ dmb sy
+TryInternalSyncIncrement
+ ldxr w1, [x0]
+ add w1, w1, #1
+ stxr w2, w1, [x0]
+ cbnz w2, TryInternalSyncIncrement
+ mov w0, w1
+ dmb sy
+ ret
+
+;/**
+; Performs an atomic decrement of an 32-bit unsigned integer.
+;
+; Performs an atomic decrement of the 32-bit unsigned integer specified by
+; Value and returns the decrement value. The decrement operation must be
+; performed using MP safe mechanisms. The state of the return value is not
+; guaranteed to be MP safe.
+;
+; @param Value A pointer to the 32-bit value to decrement.
+;
+; @return The decrement value.
+;
+;**/
+;UINT32
+;EFIAPI
+;InternalSyncDecrement (
+; IN volatile UINT32 *Value
+; )
+InternalSyncDecrement
+ dmb sy
+TryInternalSyncDecrement
+ ldxr w1, [x0]
+ sub w1, w1, #1
+ stxr w2, w1, [x0]
+ cbnz w2, TryInternalSyncDecrement
+ mov w0, w1
+ dmb sy
+ ret
+
+ END