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https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
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134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*
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* cmpxchg.h -- forked from asm/atomic.h with this copyright:
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*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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*/
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#ifndef _ASM_TILE_CMPXCHG_H
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#define _ASM_TILE_CMPXCHG_H
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#ifndef __ASSEMBLY__
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#include <asm/barrier.h>
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/* Nonexistent functions intended to cause compile errors. */
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extern void __xchg_called_with_bad_pointer(void)
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__compiletime_error("Bad argument size for xchg");
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extern void __cmpxchg_called_with_bad_pointer(void)
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__compiletime_error("Bad argument size for cmpxchg");
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#ifndef __tilegx__
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/* Note the _atomic_xxx() routines include a final mb(). */
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int _atomic_xchg(int *ptr, int n);
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int _atomic_xchg_add(int *v, int i);
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int _atomic_xchg_add_unless(int *v, int a, int u);
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int _atomic_cmpxchg(int *ptr, int o, int n);
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long long _atomic64_xchg(long long *v, long long n);
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long long _atomic64_xchg_add(long long *v, long long i);
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long long _atomic64_xchg_add_unless(long long *v, long long a, long long u);
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long long _atomic64_cmpxchg(long long *v, long long o, long long n);
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#define xchg(ptr, n) \
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({ \
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if (sizeof(*(ptr)) != 4) \
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__xchg_called_with_bad_pointer(); \
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smp_mb(); \
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(typeof(*(ptr)))_atomic_xchg((int *)(ptr), (int)(n)); \
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})
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#define cmpxchg(ptr, o, n) \
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({ \
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if (sizeof(*(ptr)) != 4) \
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__cmpxchg_called_with_bad_pointer(); \
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smp_mb(); \
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(typeof(*(ptr)))_atomic_cmpxchg((int *)ptr, (int)o, \
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(int)n); \
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})
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#define xchg64(ptr, n) \
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({ \
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if (sizeof(*(ptr)) != 8) \
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__xchg_called_with_bad_pointer(); \
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smp_mb(); \
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(typeof(*(ptr)))_atomic64_xchg((long long *)(ptr), \
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(long long)(n)); \
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})
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#define cmpxchg64(ptr, o, n) \
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({ \
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if (sizeof(*(ptr)) != 8) \
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__cmpxchg_called_with_bad_pointer(); \
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smp_mb(); \
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(typeof(*(ptr)))_atomic64_cmpxchg((long long *)ptr, \
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(long long)o, (long long)n); \
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})
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#else
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#define xchg(ptr, n) \
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({ \
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typeof(*(ptr)) __x; \
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smp_mb(); \
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switch (sizeof(*(ptr))) { \
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case 4: \
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__x = (typeof(__x))(unsigned long) \
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__insn_exch4((ptr), \
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(u32)(unsigned long)(n)); \
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break; \
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case 8: \
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__x = (typeof(__x)) \
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__insn_exch((ptr), (unsigned long)(n)); \
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break; \
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default: \
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__xchg_called_with_bad_pointer(); \
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break; \
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} \
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smp_mb(); \
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__x; \
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})
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#define cmpxchg(ptr, o, n) \
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({ \
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typeof(*(ptr)) __x; \
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__insn_mtspr(SPR_CMPEXCH_VALUE, (unsigned long)(o)); \
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smp_mb(); \
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switch (sizeof(*(ptr))) { \
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case 4: \
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__x = (typeof(__x))(unsigned long) \
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__insn_cmpexch4((ptr), \
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(u32)(unsigned long)(n)); \
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break; \
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case 8: \
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__x = (typeof(__x))__insn_cmpexch((ptr), \
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(long long)(n)); \
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break; \
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default: \
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__cmpxchg_called_with_bad_pointer(); \
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break; \
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} \
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smp_mb(); \
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__x; \
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})
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#define xchg64 xchg
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#define cmpxchg64 cmpxchg
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#endif
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#define tas(ptr) xchg((ptr), 1)
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_TILE_CMPXCHG_H */
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