From 3c99107841da7f4f646c5bba94f55d73a936e82a Mon Sep 17 00:00:00 2001 From: mdkinney Date: Tue, 18 Aug 2009 21:02:42 +0000 Subject: Add ARM support Add C inline versions of the IA32 and X64 assembly functions. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9112 6f19259b-4bc3-4df7-8a09-765794883524 --- .../BaseSynchronizationLib/Ia32/GccInline.c | 193 +++++++++++++++++++++ 1 file changed, 193 insertions(+) create mode 100644 MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c (limited to 'MdePkg/Library/BaseSynchronizationLib/Ia32') diff --git a/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c b/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c new file mode 100644 index 0000000000..eeb16c3d29 --- /dev/null +++ b/MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c @@ -0,0 +1,193 @@ +/** @file + GCC inline implementation of BaseSynchronizationLib processor specific functions. + + Copyright (c) 2006 - 2009, Intel Corporation
+ Portions copyright (c) 2008-2009 Apple Inc.
+ 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" + "movl %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" + "movl %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__ ( + " \n\t" + "lock \n\t" + "cmpxchgl %1, %2 \n\t" + : "=a" (CompareValue) // %0 + : "q" (ExchangeValue), // %1 + "m" (*Value),m // %2 + "0" (CompareValue) // %4 + : "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__ ( + " \n\t" + "push %%ebx \n\t" + "movl %2,%%ebx \n\t" + "lock \n\t" + "cmpxchg8b (%1) \n\t" + "pop %%ebx \n\t" + : "+A" (CompareValue) // %0 + : "S" (Value), // %1 + "r" ((UINT32) ExchangeValue), // %2 + "c" ((UINT32) (ExchangeValue >> 32)) // %3 + : "memory", + "cc" + ); + + return CompareValue; + +#endif +} + + -- cgit v1.2.3