diff options
Diffstat (limited to 'kernel/arch/s390/include/asm/cmpxchg.h')
-rw-r--r-- | kernel/arch/s390/include/asm/cmpxchg.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/kernel/arch/s390/include/asm/cmpxchg.h b/kernel/arch/s390/include/asm/cmpxchg.h new file mode 100644 index 000000000..4eadec466 --- /dev/null +++ b/kernel/arch/s390/include/asm/cmpxchg.h @@ -0,0 +1,91 @@ +/* + * 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 __HAVE_ARCH_CMPXCHG + +#define __cmpxchg_double_op(p1, p2, o1, o2, n1, n2, insn) \ +({ \ + 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( \ + insn " %[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_4(p1, p2, o1, o2, n1, n2) \ + __cmpxchg_double_op(p1, p2, o1, o2, n1, n2, "cds") + +#define __cmpxchg_double_8(p1, p2, o1, o2, n1, n2) \ + __cmpxchg_double_op(p1, p2, o1, o2, n1, n2, "cdsg") + +extern void __cmpxchg_double_called_with_bad_pointer(void); + +#define __cmpxchg_double(p1, p2, o1, o2, n1, n2) \ +({ \ + int __ret; \ + switch (sizeof(*(p1))) { \ + case 4: \ + __ret = __cmpxchg_double_4(p1, p2, o1, o2, n1, n2); \ + break; \ + case 8: \ + __ret = __cmpxchg_double_8(p1, p2, o1, o2, n1, n2); \ + break; \ + default: \ + __cmpxchg_double_called_with_bad_pointer(); \ + } \ + __ret; \ +}) + +#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_8(__p1, __p2, o1, o2, n1, n2); \ +}) + +#define system_has_cmpxchg_double() 1 + +#endif /* __ASM_CMPXCHG_H */ |