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