Release 4.14 arch/s390/include/asm/cmpxchg.h

/* 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 */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
80
84.21%
4
66.67%
Martin Schwidefsky
14
14.74%
1
16.67%
Greg Kroah-Hartman
1
1.05%
1
16.67%
Total
95
100.00%
6
100.00%
Directory: arch/s390/include/asm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.