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124 lines
3.7 KiB
124 lines
3.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* forked from parisc asm/atomic.h which was: |
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* Copyright (C) 2000 Philipp Rumpf <[email protected]> |
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* Copyright (C) 2006 Kyle McMartin <[email protected]> |
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*/ |
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#ifndef _ASM_PARISC_CMPXCHG_H_ |
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#define _ASM_PARISC_CMPXCHG_H_ |
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/* This should get optimized out since it's never called. |
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** Or get a link error if xchg is used "wrong". |
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*/ |
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extern void __xchg_called_with_bad_pointer(void); |
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/* __xchg32/64 defined in arch/parisc/lib/bitops.c */ |
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extern unsigned long __xchg8(char, volatile char *); |
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extern unsigned long __xchg32(int, volatile int *); |
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#ifdef CONFIG_64BIT |
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extern unsigned long __xchg64(unsigned long, volatile unsigned long *); |
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#endif |
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/* optimizer better get rid of switch since size is a constant */ |
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static inline unsigned long |
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__xchg(unsigned long x, volatile void *ptr, int size) |
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{ |
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switch (size) { |
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#ifdef CONFIG_64BIT |
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case 8: return __xchg64(x, (volatile unsigned long *) ptr); |
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#endif |
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case 4: return __xchg32((int) x, (volatile int *) ptr); |
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case 1: return __xchg8((char) x, (volatile char *) ptr); |
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} |
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__xchg_called_with_bad_pointer(); |
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return x; |
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} |
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/* |
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** REVISIT - Abandoned use of LDCW in xchg() for now: |
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** o need to test sizeof(*ptr) to avoid clearing adjacent bytes |
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** o and while we are at it, could CONFIG_64BIT code use LDCD too? |
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** |
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** if (__builtin_constant_p(x) && (x == NULL)) |
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** if (((unsigned long)p & 0xf) == 0) |
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** return __ldcw(p); |
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*/ |
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#define xchg(ptr, x) \ |
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({ \ |
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__typeof__(*(ptr)) __ret; \ |
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__typeof__(*(ptr)) _x_ = (x); \ |
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__ret = (__typeof__(*(ptr))) \ |
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__xchg((unsigned long)_x_, (ptr), sizeof(*(ptr))); \ |
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__ret; \ |
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}) |
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/* bug catcher for when unsupported size is used - won't link */ |
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extern void __cmpxchg_called_with_bad_pointer(void); |
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/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */ |
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extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old, |
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unsigned int new_); |
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extern u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new_); |
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extern u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new_); |
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/* don't worry...optimizer will get rid of most of this */ |
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static inline unsigned long |
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__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size) |
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{ |
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switch (size) { |
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#ifdef CONFIG_64BIT |
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case 8: return __cmpxchg_u64((u64 *)ptr, old, new_); |
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#endif |
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case 4: return __cmpxchg_u32((unsigned int *)ptr, |
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(unsigned int)old, (unsigned int)new_); |
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case 1: return __cmpxchg_u8((u8 *)ptr, old & 0xff, new_ & 0xff); |
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} |
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__cmpxchg_called_with_bad_pointer(); |
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return old; |
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} |
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#define cmpxchg(ptr, o, n) \ |
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({ \ |
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__typeof__(*(ptr)) _o_ = (o); \ |
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__typeof__(*(ptr)) _n_ = (n); \ |
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(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ |
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(unsigned long)_n_, sizeof(*(ptr))); \ |
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}) |
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#include <asm-generic/cmpxchg-local.h> |
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static inline unsigned long __cmpxchg_local(volatile void *ptr, |
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unsigned long old, |
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unsigned long new_, int size) |
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{ |
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switch (size) { |
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#ifdef CONFIG_64BIT |
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case 8: return __cmpxchg_u64((u64 *)ptr, old, new_); |
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#endif |
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case 4: return __cmpxchg_u32(ptr, old, new_); |
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default: |
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return __cmpxchg_local_generic(ptr, old, new_, size); |
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} |
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} |
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/* |
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* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make |
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* them available. |
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*/ |
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#define cmpxchg_local(ptr, o, n) \ |
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((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \ |
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(unsigned long)(n), sizeof(*(ptr)))) |
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#ifdef CONFIG_64BIT |
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#define cmpxchg64_local(ptr, o, n) \ |
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({ \ |
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BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ |
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cmpxchg_local((ptr), (o), (n)); \ |
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}) |
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#else |
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#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) |
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#endif |
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#define cmpxchg64(ptr, o, n) __cmpxchg_u64(ptr, o, n) |
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#endif /* _ASM_PARISC_CMPXCHG_H_ */
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