1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright IBM Corp. 1999, 2011 4 * 5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>, 6 */ 7 8 #ifndef __ASM_CMPXCHG_H 9 #define __ASM_CMPXCHG_H 10 11 #include <linux/mmdebug.h> 12 #include <linux/types.h> 13 #include <linux/bug.h> 14 15 #define cmpxchg(ptr, o, n) \ 16 ({ \ 17 __typeof__(*(ptr)) __o = (o); \ 18 __typeof__(*(ptr)) __n = (n); \ 19 (__typeof__(*(ptr))) __sync_val_compare_and_swap((ptr),__o,__n);\ 20 }) 21 22 #define cmpxchg64 cmpxchg 23 #define cmpxchg_local cmpxchg 24 #define cmpxchg64_local cmpxchg 25 26 #define xchg(ptr, x) \ 27 ({ \ 28 __typeof__(ptr) __ptr = (ptr); \ 29 __typeof__(*(ptr)) __old; \ 30 do { \ 31 __old = *__ptr; \ 32 } while (!__sync_bool_compare_and_swap(__ptr, __old, x)); \ 33 __old; \ 34 }) 35 36 #define __cmpxchg_double(p1, p2, o1, o2, n1, n2) \ 37 ({ \ 38 register __typeof__(*(p1)) __old1 asm("2") = (o1); \ 39 register __typeof__(*(p2)) __old2 asm("3") = (o2); \ 40 register __typeof__(*(p1)) __new1 asm("4") = (n1); \ 41 register __typeof__(*(p2)) __new2 asm("5") = (n2); \ 42 int cc; \ 43 asm volatile( \ 44 " cdsg %[old],%[new],%[ptr]\n" \ 45 " ipm %[cc]\n" \ 46 " srl %[cc],28" \ 47 : [cc] "=d" (cc), [old] "+d" (__old1), "+d" (__old2) \ 48 : [new] "d" (__new1), "d" (__new2), \ 49 [ptr] "Q" (*(p1)), "Q" (*(p2)) \ 50 : "memory", "cc"); \ 51 !cc; \ 52 }) 53 54 #define cmpxchg_double(p1, p2, o1, o2, n1, n2) \ 55 ({ \ 56 __typeof__(p1) __p1 = (p1); \ 57 __typeof__(p2) __p2 = (p2); \ 58 BUILD_BUG_ON(sizeof(*(p1)) != sizeof(long)); \ 59 BUILD_BUG_ON(sizeof(*(p2)) != sizeof(long)); \ 60 VM_BUG_ON((unsigned long)((__p1) + 1) != (unsigned long)(__p2));\ 61 __cmpxchg_double(__p1, __p2, o1, o2, n1, n2); \ 62 }) 63 64 #define system_has_cmpxchg_double() 1 65 66 #endif /* __ASM_CMPXCHG_H */ 67