/* 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 */