*/
#include <urcu/compiler.h>
+#include <urcu/system.h>
-#ifndef BITS_PER_LONG
-#define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
-#endif
+#define UATOMIC_HAS_ATOMIC_BYTE
+#define UATOMIC_HAS_ATOMIC_SHORT
+
+#ifdef __cplusplus
+extern "C" {
+#endif
/*
* Derived from AO_compare_and_swap() and AO_test_and_set_full().
};
#define __hp(x) ((struct __uatomic_dummy *)(x))
-#define uatomic_set(addr, v) \
-do { \
- ACCESS_ONCE(*(addr)) = (v); \
-} while (0)
-
-#define uatomic_read(addr) ACCESS_ONCE(*(addr))
+#define _uatomic_set(addr, v) CMM_STORE_SHARED(*(addr), (v))
/* cmpxchg */
static inline __attribute__((always_inline))
-unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
+unsigned long __uatomic_cmpxchg(void *addr, unsigned long old,
unsigned long _new, int len)
{
switch (len) {
: "memory");
return result;
}
-#if (BITS_PER_LONG == 64)
+#if (CAA_BITS_PER_LONG == 64)
case 8:
{
unsigned long result = old;
return 0;
}
-#define uatomic_cmpxchg(addr, old, _new) \
- ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), (unsigned long)(old),\
- (unsigned long)(_new), \
+#define _uatomic_cmpxchg(addr, old, _new) \
+ ((__typeof__(*(addr))) __uatomic_cmpxchg((addr), (unsigned long)(old),\
+ (unsigned long)(_new), \
sizeof(*(addr))))
/* xchg */
static inline __attribute__((always_inline))
-unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
+unsigned long __uatomic_exchange(void *addr, unsigned long val, int len)
{
/* Note: the "xchg" instruction does not need a "lock" prefix. */
switch (len) {
: "memory");
return result;
}
-#if (BITS_PER_LONG == 64)
+#if (CAA_BITS_PER_LONG == 64)
case 8:
{
unsigned long result;
return 0;
}
-#define uatomic_xchg(addr, v) \
- ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \
+#define _uatomic_xchg(addr, v) \
+ ((__typeof__(*(addr))) __uatomic_exchange((addr), (unsigned long)(v), \
sizeof(*(addr))))
-/* uatomic_add_return, uatomic_sub_return */
+/* uatomic_add_return */
static inline __attribute__((always_inline))
-unsigned long _uatomic_add_return(void *addr, unsigned long val,
+unsigned long __uatomic_add_return(void *addr, unsigned long val,
int len)
{
switch (len) {
: "memory");
return result + (unsigned int)val;
}
-#if (BITS_PER_LONG == 64)
+#if (CAA_BITS_PER_LONG == 64)
case 8:
{
unsigned long result = val;
return 0;
}
-#define uatomic_add_return(addr, v) \
- ((__typeof__(*(addr))) _uatomic_add_return((addr), \
+#define _uatomic_add_return(addr, v) \
+ ((__typeof__(*(addr))) __uatomic_add_return((addr), \
(unsigned long)(v), \
sizeof(*(addr))))
-#define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v))
-
-/* uatomic_add, uatomic_sub */
+/* uatomic_add */
static inline __attribute__((always_inline))
-void _uatomic_add(void *addr, unsigned long val, int len)
+void __uatomic_add(void *addr, unsigned long val, int len)
{
switch (len) {
case 1:
: "memory");
return;
}
-#if (BITS_PER_LONG == 64)
+#if (CAA_BITS_PER_LONG == 64)
case 8:
{
__asm__ __volatile__(
return;
}
-#define uatomic_add(addr, v) \
- (_uatomic_add((addr), (unsigned long)(v), sizeof(*(addr))))
-
-#define uatomic_sub(addr, v) uatomic_add((addr), -(v))
+#define _uatomic_add(addr, v) \
+ (__uatomic_add((addr), (unsigned long)(v), sizeof(*(addr))))
/* uatomic_inc */
static inline __attribute__((always_inline))
-void _uatomic_inc(void *addr, int len)
+void __uatomic_inc(void *addr, int len)
{
switch (len) {
case 1:
: "memory");
return;
}
-#if (BITS_PER_LONG == 64)
+#if (CAA_BITS_PER_LONG == 64)
case 8:
{
__asm__ __volatile__(
return;
}
-#define uatomic_inc(addr) (_uatomic_inc((addr), sizeof(*(addr))))
+#define _uatomic_inc(addr) (__uatomic_inc((addr), sizeof(*(addr))))
/* uatomic_dec */
static inline __attribute__((always_inline))
-void _uatomic_dec(void *addr, int len)
+void __uatomic_dec(void *addr, int len)
{
switch (len) {
case 1:
: "memory");
return;
}
-#if (BITS_PER_LONG == 64)
+#if (CAA_BITS_PER_LONG == 64)
case 8:
{
__asm__ __volatile__(
return;
}
-#define uatomic_dec(addr) (_uatomic_dec((addr), sizeof(*(addr))))
+#define _uatomic_dec(addr) (__uatomic_dec((addr), sizeof(*(addr))))
+
+#if ((CAA_BITS_PER_LONG != 64) && defined(CONFIG_RCU_COMPAT_ARCH))
+extern int __rcu_cas_avail;
+extern int __rcu_cas_init(void);
+
+#define UATOMIC_COMPAT(insn) \
+ ((likely(__rcu_cas_avail > 0)) \
+ ? (_uatomic_##insn) \
+ : ((unlikely(__rcu_cas_avail < 0) \
+ ? ((__rcu_cas_init() > 0) \
+ ? (_uatomic_##insn) \
+ : (compat_uatomic_##insn)) \
+ : (compat_uatomic_##insn))))
+
+extern unsigned long _compat_uatomic_set(void *addr,
+ unsigned long _new, int len);
+#define compat_uatomic_set(addr, _new) \
+ ((__typeof__(*(addr))) _compat_uatomic_set((addr), \
+ (unsigned long)(_new), \
+ sizeof(*(addr))))
-#if (BITS_PER_LONG == 64)
-#define URCU_CAS_AVAIL() 1
-#define compat_uatomic_cmpxchg(ptr, old, _new) uatomic_cmpxchg(ptr, old, _new)
-#else
-extern int __urcu_cas_avail;
-#define URCU_CAS_AVAIL() __urcu_cas_avail
+
+extern unsigned long _compat_uatomic_xchg(void *addr,
+ unsigned long _new, int len);
+#define compat_uatomic_xchg(addr, _new) \
+ ((__typeof__(*(addr))) _compat_uatomic_xchg((addr), \
+ (unsigned long)(_new), \
+ sizeof(*(addr))))
extern unsigned long _compat_uatomic_cmpxchg(void *addr, unsigned long old,
- unsigned long _new, int len);
+ unsigned long _new, int len);
+#define compat_uatomic_cmpxchg(addr, old, _new) \
+ ((__typeof__(*(addr))) _compat_uatomic_cmpxchg((addr), \
+ (unsigned long)(old), \
+ (unsigned long)(_new), \
+ sizeof(*(addr))))
-#define compat_uatomic_cmpxchg(addr, old, _new) \
- ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), (unsigned long)(old),\
- (unsigned long)(_new), \
+extern unsigned long _compat_uatomic_xchg(void *addr,
+ unsigned long _new, int len);
+#define compat_uatomic_add_return(addr, v) \
+ ((__typeof__(*(addr))) _compat_uatomic_add_return((addr), \
+ (unsigned long)(v), \
sizeof(*(addr))))
+
+#define compat_uatomic_add(addr, v) \
+ ((void)compat_uatomic_add_return((addr), (v)))
+#define compat_uatomic_inc(addr) \
+ (compat_uatomic_add((addr), 1))
+#define compat_uatomic_dec(addr) \
+ (compat_uatomic_add((addr), -1))
+
+#else
+#define UATOMIC_COMPAT(insn) (_uatomic_##insn)
+#endif
+
+/* Read is atomic even in compat mode */
+#define uatomic_set(addr, v) \
+ UATOMIC_COMPAT(set(addr, v))
+
+#define uatomic_cmpxchg(addr, old, _new) \
+ UATOMIC_COMPAT(cmpxchg(addr, old, _new))
+#define uatomic_xchg(addr, v) \
+ UATOMIC_COMPAT(xchg(addr, v))
+#define uatomic_add_return(addr, v) \
+ UATOMIC_COMPAT(add_return(addr, v))
+
+#define uatomic_add(addr, v) UATOMIC_COMPAT(add(addr, v))
+#define uatomic_inc(addr) UATOMIC_COMPAT(inc(addr))
+#define uatomic_dec(addr) UATOMIC_COMPAT(dec(addr))
+
+#ifdef __cplusplus
+}
#endif
+#include <urcu/uatomic_generic.h>
+
#endif /* _URCU_ARCH_UATOMIC_X86_H */