1#define a_cas a_cas
  2static inline int a_cas(volatile int *p, int t, int s)
  3{
  4	__asm__ __volatile__ (
  5		"lock ; cmpxchg %3, %1"
  6		: "=a"(t), "=m"(*p) : "a"(t), "r"(s) : "memory" );
  7	return t;
  8}
  9
 10#define a_swap a_swap
 11static inline int a_swap(volatile int *p, int v)
 12{
 13	__asm__ __volatile__(
 14		"xchg %0, %1"
 15		: "=r"(v), "=m"(*p) : "0"(v) : "memory" );
 16	return v;
 17}
 18
 19#define a_fetch_add a_fetch_add
 20static inline int a_fetch_add(volatile int *p, int v)
 21{
 22	__asm__ __volatile__(
 23		"lock ; xadd %0, %1"
 24		: "=r"(v), "=m"(*p) : "0"(v) : "memory" );
 25	return v;
 26}
 27
 28#define a_and a_and
 29static inline void a_and(volatile int *p, int v)
 30{
 31	__asm__ __volatile__(
 32		"lock ; and %1, %0"
 33		: "=m"(*p) : "r"(v) : "memory" );
 34}
 35
 36#define a_or a_or
 37static inline void a_or(volatile int *p, int v)
 38{
 39	__asm__ __volatile__(
 40		"lock ; or %1, %0"
 41		: "=m"(*p) : "r"(v) : "memory" );
 42}
 43
 44#define a_inc a_inc
 45static inline void a_inc(volatile int *p)
 46{
 47	__asm__ __volatile__(
 48		"lock ; incl %0"
 49		: "=m"(*p) : "m"(*p) : "memory" );
 50}
 51
 52#define a_dec a_dec
 53static inline void a_dec(volatile int *p)
 54{
 55	__asm__ __volatile__(
 56		"lock ; decl %0"
 57		: "=m"(*p) : "m"(*p) : "memory" );
 58}
 59
 60#define a_store a_store
 61static inline void a_store(volatile int *p, int x)
 62{
 63	__asm__ __volatile__(
 64		"mov %1, %0 ; lock ; orl $0,(%%esp)"
 65		: "=m"(*p) : "r"(x) : "memory" );
 66}
 67
 68#define a_barrier a_barrier
 69static inline void a_barrier()
 70{
 71	__asm__ __volatile__( "" : : : "memory" );
 72}
 73
 74#define a_spin a_spin
 75static inline void a_spin()
 76{
 77	__asm__ __volatile__( "pause" : : : "memory" );
 78}
 79
 80#define a_crash a_crash
 81static inline void a_crash()
 82{
 83	__asm__ __volatile__( "hlt" : : : "memory" );
 84}
 85
 86#define a_ctz_64 a_ctz_64
 87static inline int a_ctz_64(uint64_t x)
 88{
 89	int r;
 90	__asm__( "bsf %1,%0 ; jnz 1f ; bsf %2,%0 ; add $32,%0\n1:"
 91		: "=&r"(r) : "r"((unsigned)x), "r"((unsigned)(x>>32)) );
 92	return r;
 93}
 94
 95#define a_ctz_32 a_ctz_32
 96static inline int a_ctz_32(uint32_t x)
 97{
 98	int r;
 99	__asm__( "bsf %1,%0" : "=r"(r) : "r"(x) );
100	return r;
101}
102
103#define a_clz_32 a_clz_32
104static inline int a_clz_32(uint32_t x)
105{
106	__asm__( "bsr %1,%0 ; xor $31,%0" : "=r"(x) : "r"(x) );
107	return x;
108}