1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright IBM Corp. 1999, 2011 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>, 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun #ifndef __ASM_CMPXCHG_H 9*4882a593Smuzhiyun #define __ASM_CMPXCHG_H 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun #include <linux/mmdebug.h> 12*4882a593Smuzhiyun #include <linux/types.h> 13*4882a593Smuzhiyun #include <linux/bug.h> 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun #define cmpxchg(ptr, o, n) \ 16*4882a593Smuzhiyun ({ \ 17*4882a593Smuzhiyun __typeof__(*(ptr)) __o = (o); \ 18*4882a593Smuzhiyun __typeof__(*(ptr)) __n = (n); \ 19*4882a593Smuzhiyun (__typeof__(*(ptr))) __sync_val_compare_and_swap((ptr),__o,__n);\ 20*4882a593Smuzhiyun }) 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun #define cmpxchg64 cmpxchg 23*4882a593Smuzhiyun #define cmpxchg_local cmpxchg 24*4882a593Smuzhiyun #define cmpxchg64_local cmpxchg 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun #define xchg(ptr, x) \ 27*4882a593Smuzhiyun ({ \ 28*4882a593Smuzhiyun __typeof__(ptr) __ptr = (ptr); \ 29*4882a593Smuzhiyun __typeof__(*(ptr)) __old; \ 30*4882a593Smuzhiyun do { \ 31*4882a593Smuzhiyun __old = *__ptr; \ 32*4882a593Smuzhiyun } while (!__sync_bool_compare_and_swap(__ptr, __old, x)); \ 33*4882a593Smuzhiyun __old; \ 34*4882a593Smuzhiyun }) 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun #define __cmpxchg_double(p1, p2, o1, o2, n1, n2) \ 37*4882a593Smuzhiyun ({ \ 38*4882a593Smuzhiyun register __typeof__(*(p1)) __old1 asm("2") = (o1); \ 39*4882a593Smuzhiyun register __typeof__(*(p2)) __old2 asm("3") = (o2); \ 40*4882a593Smuzhiyun register __typeof__(*(p1)) __new1 asm("4") = (n1); \ 41*4882a593Smuzhiyun register __typeof__(*(p2)) __new2 asm("5") = (n2); \ 42*4882a593Smuzhiyun int cc; \ 43*4882a593Smuzhiyun asm volatile( \ 44*4882a593Smuzhiyun " cdsg %[old],%[new],%[ptr]\n" \ 45*4882a593Smuzhiyun " ipm %[cc]\n" \ 46*4882a593Smuzhiyun " srl %[cc],28" \ 47*4882a593Smuzhiyun : [cc] "=d" (cc), [old] "+d" (__old1), "+d" (__old2) \ 48*4882a593Smuzhiyun : [new] "d" (__new1), "d" (__new2), \ 49*4882a593Smuzhiyun [ptr] "Q" (*(p1)), "Q" (*(p2)) \ 50*4882a593Smuzhiyun : "memory", "cc"); \ 51*4882a593Smuzhiyun !cc; \ 52*4882a593Smuzhiyun }) 53*4882a593Smuzhiyun 54*4882a593Smuzhiyun #define cmpxchg_double(p1, p2, o1, o2, n1, n2) \ 55*4882a593Smuzhiyun ({ \ 56*4882a593Smuzhiyun __typeof__(p1) __p1 = (p1); \ 57*4882a593Smuzhiyun __typeof__(p2) __p2 = (p2); \ 58*4882a593Smuzhiyun BUILD_BUG_ON(sizeof(*(p1)) != sizeof(long)); \ 59*4882a593Smuzhiyun BUILD_BUG_ON(sizeof(*(p2)) != sizeof(long)); \ 60*4882a593Smuzhiyun VM_BUG_ON((unsigned long)((__p1) + 1) != (unsigned long)(__p2));\ 61*4882a593Smuzhiyun __cmpxchg_double(__p1, __p2, o1, o2, n1, n2); \ 62*4882a593Smuzhiyun }) 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun #define system_has_cmpxchg_double() 1 65*4882a593Smuzhiyun 66*4882a593Smuzhiyun #endif /* __ASM_CMPXCHG_H */ 67