diff options
Diffstat (limited to 'Core/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S')
| -rw-r--r-- | Core/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S b/Core/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S new file mode 100644 index 0000000000..ecb87fc127 --- /dev/null +++ b/Core/MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S @@ -0,0 +1,203 @@ +// 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.
+//
+// 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.
+//
+//
+
+.text
+.align 3
+
+GCC_ASM_EXPORT(InternalSyncCompareExchange16)
+GCC_ASM_EXPORT(InternalSyncCompareExchange32)
+GCC_ASM_EXPORT(InternalSyncCompareExchange64)
+GCC_ASM_EXPORT(InternalSyncIncrement)
+GCC_ASM_EXPORT(InternalSyncDecrement)
+
+/**
+ 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
+// )
+ASM_PFX(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
+// )
+ASM_PFX(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
+// )
+ASM_PFX(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
+// )
+ASM_PFX(InternalSyncIncrement):
+ dmb sy
+TryInternalSyncIncrement:
+ ldxr w1, [x0]
+ add w1, w1, #1
+ stxr w2, w1, [x0]
+ cbnz w2, TryInternalSyncIncrement
+ 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
+// )
+ASM_PFX(InternalSyncDecrement):
+ dmb sy
+TryInternalSyncDecrement:
+ ldxr w1, [x0]
+ sub w1, w1, #1
+ stxr w2, w1, [x0]
+ cbnz w2, TryInternalSyncDecrement
+ dmb sy
+ ret
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