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Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c')
| -rw-r--r-- | src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c new file mode 100644 index 00000000..7c9f1673 --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c @@ -0,0 +1,201 @@ +/** @file + GCC inline implementation of BaseSynchronizationLib processor specific functions. + + Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR> + Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR> + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + + + +/** + 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. + + @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__ ( + "movl $1, %%eax \n\t" + "lock \n\t" + "xadd %%eax, %1 \n\t" + "inc %%eax \n\t" + : "=&a" (Result), // %0 + "+m" (*Value) // %1 + : // no inputs that aren't also outputs + : "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. + + @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__ ( + "movl $-1, %%eax \n\t" + "lock \n\t" + "xadd %%eax, %1 \n\t" + "dec %%eax \n\t" + : "=&a" (Result), // %0 + "+m" (*Value) // %1 + : // no inputs that aren't also outputs + : "memory", + "cc" + ); + + return Result; +} + + +/** + 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 OUT volatile UINT16 *Value, + IN UINT16 CompareValue, + IN UINT16 ExchangeValue + ) +{ + __asm__ __volatile__ ( + "lock \n\t" + "cmpxchgw %2, %1 \n\t" + : "+a" (CompareValue), // %0 + "+m" (*Value) // %1 + : "q" (ExchangeValue) // %2 + : "memory", + "cc" + ); + + return CompareValue; +} + + +/** + 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 + ) +{ + __asm__ __volatile__ ( + "lock \n\t" + "cmpxchgl %2, %1 \n\t" + : "+a" (CompareValue), // %0 + "+m" (*Value) // %1 + : "q" (ExchangeValue) // %2 + : "memory", + "cc" + ); + + return CompareValue; +} + + +/** + 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 + ) +{ + __asm__ __volatile__ ( + "lock \n\t" + "cmpxchg8b (%1) \n\t" + : "+A" (CompareValue) // %0 + : "S" (Value), // %1 + "b" ((UINT32) ExchangeValue), // %2 + "c" ((UINT32) (ExchangeValue >> 32)) // %3 + : "memory", + "cc" + ); + + return CompareValue; +} |