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Diffstat (limited to 'MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c')
| -rw-r--r-- | MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c b/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c new file mode 100644 index 0000000000..d925f0c74e --- /dev/null +++ b/MdePkg/Library/BaseSynchronizationLib/X64/GccInline.c @@ -0,0 +1,192 @@ +/** @file + GCC inline implementation of BaseSynchronizationLib processor specific functions. + + Copyright (c) 2006 - 2009, Intel Corporation<BR> + Portions copyright (c) 2008-2009 Apple Inc.<BR> + 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. + +**/ + + + + +/** + 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 + ) +{ + UINT32 Result; + + __asm__ __volatile__ ( + "lock \n\t" + "incl %2 \n\t" + "mov %2, %%eax " + : "=a" (Result), // %0 + "=m" (*Value) // %1 + : "m" (*Value) // %2 + : "memory", + "cc" + ); + + return Result; + +} + + +/** + 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 decremented 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 decremented value. + +**/ +UINT32 +EFIAPI +InternalSyncDecrement ( + IN volatile UINT32 *Value + ) +{ + UINT32 Result; + + __asm__ __volatile__ ( + "lock \n\t" + "decl %2 \n\t" + "mov %2, %%eax " + : "=a" (Result), // %0 + "=m" (*Value) // %1 + : "m" (*Value) // %2 + : "memory", + "cc" + ); + + return Result; +} + + +/** + 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 OUT volatile UINT32 *Value, + IN UINT32 CompareValue, + IN UINT32 ExchangeValue + ) +{ +// GCC 4.1 and forward supports atomic builtins +#if ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 1))) + + return __sync_val_compare_and_swap (Value, CompareValue, ExchangeValue); + +#else + + __asm__ __volatile__ ( + "lock \n\t" + "cmpxchgl %3, %1 " + : "=a" (CompareValue), // %0 + "=m" (*Value) // %1 + : "a" (CompareValue), // %2 + "r" (ExchangeValue), // %3 + "m" (*Value) + : "memory", + "cc" + ); + + return CompareValue; + +#endif +} + + +/** + 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 OUT volatile UINT64 *Value, + IN UINT64 CompareValue, + IN UINT64 ExchangeValue + ) +{ +// GCC 4.1 and forward supports atomic builtins +#if ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 1))) + + return __sync_val_compare_and_swap (Value, CompareValue, ExchangeValue); + +#else + + __asm__ __volatile__ ( + "lock \n\t" + "cmpxchgq %3, %1 " + : "=a" (CompareValue), // %0 + "=m" (*Value) // %1 + : "a" (CompareValue), // %2 + "r" (ExchangeValue), // %3 + "m" (*Value) + : "memory", + "cc" + ); + + return CompareValue; + +#endif +} + + |