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