67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright IBM Corp. 1999, 2011
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
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*/
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#ifndef __ASM_CMPXCHG_H
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#define __ASM_CMPXCHG_H
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#include <linux/mmdebug.h>
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#include <linux/types.h>
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#include <linux/bug.h>
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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))) __sync_val_compare_and_swap((ptr),__o,__n);\
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})
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#define cmpxchg64 cmpxchg
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#define cmpxchg_local cmpxchg
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#define cmpxchg64_local cmpxchg
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#define xchg(ptr, x) \
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({ \
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__typeof__(ptr) __ptr = (ptr); \
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__typeof__(*(ptr)) __old; \
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do { \
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__old = *__ptr; \
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} while (!__sync_bool_compare_and_swap(__ptr, __old, x)); \
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__old; \
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})
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#define __cmpxchg_double(p1, p2, o1, o2, n1, n2) \
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({ \
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register __typeof__(*(p1)) __old1 asm("2") = (o1); \
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register __typeof__(*(p2)) __old2 asm("3") = (o2); \
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register __typeof__(*(p1)) __new1 asm("4") = (n1); \
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register __typeof__(*(p2)) __new2 asm("5") = (n2); \
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int cc; \
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asm volatile( \
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" cdsg %[old],%[new],%[ptr]\n" \
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" ipm %[cc]\n" \
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" srl %[cc],28" \
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: [cc] "=d" (cc), [old] "+d" (__old1), "+d" (__old2) \
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: [new] "d" (__new1), "d" (__new2), \
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[ptr] "Q" (*(p1)), "Q" (*(p2)) \
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: "memory", "cc"); \
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!cc; \
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})
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#define cmpxchg_double(p1, p2, o1, o2, n1, n2) \
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({ \
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__typeof__(p1) __p1 = (p1); \
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__typeof__(p2) __p2 = (p2); \
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BUILD_BUG_ON(sizeof(*(p1)) != sizeof(long)); \
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BUILD_BUG_ON(sizeof(*(p2)) != sizeof(long)); \
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VM_BUG_ON((unsigned long)((__p1) + 1) != (unsigned long)(__p2));\
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__cmpxchg_double(__p1, __p2, o1, o2, n1, n2); \
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})
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#define system_has_cmpxchg_double() 1
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#endif /* __ASM_CMPXCHG_H */
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