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git.proxmox.com Git - mirror_edk2.git/blob - MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c
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2 GCC inline implementation of BaseSynchronizationLib processor specific functions.
4 Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
5 Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
6 This program and the accompanying materials
7 are licensed and made available under the terms and conditions of the BSD License
8 which accompanies this distribution. The full text of the license may be found at
9 http://opensource.org/licenses/bsd-license.php.
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
19 Performs an atomic increment of an 32-bit unsigned integer.
21 Performs an atomic increment of the 32-bit unsigned integer specified by
22 Value and returns the incremented value. The increment operation must be
23 performed using MP safe mechanisms. The state of the return value is not
24 guaranteed to be MP safe.
26 @param Value A pointer to the 32-bit value to increment.
28 @return The incremented value.
33 InternalSyncIncrement (
34 IN
volatile UINT32
*Value
39 __asm__
__volatile__ (
43 : "=a" (Result
), // %0
56 Performs an atomic decrement of an 32-bit unsigned integer.
58 Performs an atomic decrement of the 32-bit unsigned integer specified by
59 Value and returns the decremented value. The decrement operation must be
60 performed using MP safe mechanisms. The state of the return value is not
61 guaranteed to be MP safe.
63 @param Value A pointer to the 32-bit value to decrement.
65 @return The decremented value.
70 InternalSyncDecrement (
71 IN
volatile UINT32
*Value
76 __asm__
__volatile__ (
80 : "=a" (Result
), // %0
91 Performs an atomic compare exchange operation on a 32-bit unsigned integer.
93 Performs an atomic compare exchange operation on the 32-bit unsigned integer
94 specified by Value. If Value is equal to CompareValue, then Value is set to
95 ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
96 then Value is returned. The compare exchange operation must be performed using
100 @param Value A pointer to the 32-bit value for the compare exchange
102 @param CompareValue 32-bit value used in compare operation.
103 @param ExchangeValue 32-bit value used in exchange operation.
105 @return The original *Value before exchange.
110 InternalSyncCompareExchange32 (
111 IN OUT
volatile UINT32
*Value
,
112 IN UINT32 CompareValue
,
113 IN UINT32 ExchangeValue
117 __asm__
__volatile__ (
120 "cmpxchgl %1, %2 \n\t"
121 : "=a" (CompareValue
) // %0
122 : "q" (ExchangeValue
), // %1
124 "0" (CompareValue
) // %4
133 Performs an atomic compare exchange operation on a 64-bit unsigned integer.
135 Performs an atomic compare exchange operation on the 64-bit unsigned integer specified
136 by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and
137 CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.
138 The compare exchange operation must be performed using MP safe mechanisms.
141 @param Value A pointer to the 64-bit value for the compare exchange
143 @param CompareValue 64-bit value used in compare operation.
144 @param ExchangeValue 64-bit value used in exchange operation.
146 @return The original *Value before exchange.
151 InternalSyncCompareExchange64 (
152 IN OUT
volatile UINT64
*Value
,
153 IN UINT64 CompareValue
,
154 IN UINT64 ExchangeValue
157 __asm__
__volatile__ (
162 "cmpxchg8b (%1) \n\t"
164 : "+A" (CompareValue
) // %0
166 "r" ((UINT32
) ExchangeValue
), // %2
167 "c" ((UINT32
) (ExchangeValue
>> 32)) // %3