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Commit f43f7b46 authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Linus Torvalds
Browse files

local_t: alpha extension 



Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5e97b930

include/asm-alpha/local.h

+102 −24
Original line number Diff line number Diff line
@@ -4,37 +4,115 @@ 
#include <linux/percpu.h>

#include <asm/atomic.h>



typedef atomic64_t local_t;

typedef struct

{

	atomic_long_t a;

} local_t;



#define LOCAL_INIT(i)	ATOMIC64_INIT(i)

#define local_read(v)	atomic64_read(v)

#define local_set(v,i)	atomic64_set(v,i)

#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }

#define local_read(l)	atomic_long_read(&(l)->a)

#define local_set(l,i)	atomic_long_set(&(l)->a, (i))

#define local_inc(l)	atomic_long_inc(&(l)->a)

#define local_dec(l)	atomic_long_dec(&(l)->a)

#define local_add(i,l)	atomic_long_add((i),(&(l)->a))

#define local_sub(i,l)	atomic_long_sub((i),(&(l)->a))



#define local_inc(v)	atomic64_inc(v)

#define local_dec(v)	atomic64_dec(v)

#define local_add(i, v)	atomic64_add(i, v)

#define local_sub(i, v)	atomic64_sub(i, v)

static __inline__ long local_add_return(long i, local_t * l)

{

	long temp, result;

	__asm__ __volatile__(

	"1:	ldq_l %0,%1\n"

	"	addq %0,%3,%2\n"

	"	addq %0,%3,%0\n"

	"	stq_c %0,%1\n"

	"	beq %0,2f\n"

	".subsection 2\n"

	"2:	br 1b\n"

	".previous"

	:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)

	:"Ir" (i), "m" (l->a.counter) : "memory");

	return result;

}



#define __local_inc(v)		((v)->counter++)

#define __local_dec(v)		((v)->counter++)

#define __local_add(i,v)	((v)->counter+=(i))

#define __local_sub(i,v)	((v)->counter-=(i))

static __inline__ long local_sub_return(long i, local_t * l)

{

	long temp, result;

	__asm__ __volatile__(

	"1:	ldq_l %0,%1\n"

	"	subq %0,%3,%2\n"

	"	subq %0,%3,%0\n"

	"	stq_c %0,%1\n"

	"	beq %0,2f\n"

	".subsection 2\n"

	"2:	br 1b\n"

	".previous"

	:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)

	:"Ir" (i), "m" (l->a.counter) : "memory");

	return result;

}



#define local_cmpxchg(l, o, n) \

	(cmpxchg_local(&((l)->a.counter), (o), (n)))

#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))



/**

 * local_add_unless - add unless the number is a given value

 * @l: pointer of type local_t

 * @a: the amount to add to l...

 * @u: ...unless l is equal to u.

 *

 * Atomically adds @a to @l, so long as it was not @u.

 * Returns non-zero if @l was not @u, and zero otherwise.

 */

#define local_add_unless(l, a, u)				\

({								\

	long c, old;						\

	c = local_read(l);					\

	for (;;) {						\

		if (unlikely(c == (u)))				\

			break;					\

		old = local_cmpxchg((l), c, c + (a));	\

		if (likely(old == c))				\

			break;					\

		c = old;					\

	}							\

	c != (u);						\

})

#define local_inc_not_zero(l) local_add_unless((l), 1, 0)



#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)



#define local_dec_return(l) local_sub_return(1,(l))



#define local_inc_return(l) local_add_return(1,(l))



#define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)



#define local_inc_and_test(l) (local_add_return(1, (l)) == 0)



#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)



/* Verify if faster than atomic ops */

#define __local_inc(l)		((l)->a.counter++)

#define __local_dec(l)		((l)->a.counter++)

#define __local_add(i,l)	((l)->a.counter+=(i))

#define __local_sub(i,l)	((l)->a.counter-=(i))



/* Use these for per-cpu local_t variables: on some archs they are

 * much more efficient than these naive implementations.  Note they take

 * a variable, not an address.

 */

#define cpu_local_read(v)	local_read(&__get_cpu_var(v))

#define cpu_local_set(v, i)	local_set(&__get_cpu_var(v), (i))



#define cpu_local_inc(v)	local_inc(&__get_cpu_var(v))

#define cpu_local_dec(v)	local_dec(&__get_cpu_var(v))

#define cpu_local_add(i, v)	local_add((i), &__get_cpu_var(v))

#define cpu_local_sub(i, v)	local_sub((i), &__get_cpu_var(v))



#define __cpu_local_inc(v)	__local_inc(&__get_cpu_var(v))

#define __cpu_local_dec(v)	__local_dec(&__get_cpu_var(v))

#define __cpu_local_add(i, v)	__local_add((i), &__get_cpu_var(v))

#define __cpu_local_sub(i, v)	__local_sub((i), &__get_cpu_var(v))

#define cpu_local_read(l)	local_read(&__get_cpu_var(l))

#define cpu_local_set(l, i)	local_set(&__get_cpu_var(l), (i))



#define cpu_local_inc(l)	local_inc(&__get_cpu_var(l))

#define cpu_local_dec(l)	local_dec(&__get_cpu_var(l))

#define cpu_local_add(i, l)	local_add((i), &__get_cpu_var(l))

#define cpu_local_sub(i, l)	local_sub((i), &__get_cpu_var(l))



#define __cpu_local_inc(l)	__local_inc(&__get_cpu_var(l))

#define __cpu_local_dec(l)	__local_dec(&__get_cpu_var(l))

#define __cpu_local_add(i, l)	__local_add((i), &__get_cpu_var(l))

#define __cpu_local_sub(i, l)	__local_sub((i), &__get_cpu_var(l))



#endif /* _ALPHA_LOCAL_H */

include/asm-alpha/system.h

+227 −0
Original line number Diff line number Diff line
@@ -443,6 +443,111 @@ extern void __xchg_called_with_bad_pointer(void); 
     (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \

  })



static inline unsigned long

__xchg_u8_local(volatile char *m, unsigned long val)

{

	unsigned long ret, tmp, addr64;



	__asm__ __volatile__(

	"	andnot	%4,7,%3\n"

	"	insbl	%1,%4,%1\n"

	"1:	ldq_l	%2,0(%3)\n"

	"	extbl	%2,%4,%0\n"

	"	mskbl	%2,%4,%2\n"

	"	or	%1,%2,%2\n"

	"	stq_c	%2,0(%3)\n"

	"	beq	%2,2f\n"

	".subsection 2\n"

	"2:	br	1b\n"

	".previous"

	: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)

	: "r" ((long)m), "1" (val) : "memory");



	return ret;

}



static inline unsigned long

__xchg_u16_local(volatile short *m, unsigned long val)

{

	unsigned long ret, tmp, addr64;



	__asm__ __volatile__(

	"	andnot	%4,7,%3\n"

	"	inswl	%1,%4,%1\n"

	"1:	ldq_l	%2,0(%3)\n"

	"	extwl	%2,%4,%0\n"

	"	mskwl	%2,%4,%2\n"

	"	or	%1,%2,%2\n"

	"	stq_c	%2,0(%3)\n"

	"	beq	%2,2f\n"

	".subsection 2\n"

	"2:	br	1b\n"

	".previous"

	: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)

	: "r" ((long)m), "1" (val) : "memory");



	return ret;

}



static inline unsigned long

__xchg_u32_local(volatile int *m, unsigned long val)

{

	unsigned long dummy;



	__asm__ __volatile__(

	"1:	ldl_l %0,%4\n"

	"	bis $31,%3,%1\n"

	"	stl_c %1,%2\n"

	"	beq %1,2f\n"

	".subsection 2\n"

	"2:	br 1b\n"

	".previous"

	: "=&r" (val), "=&r" (dummy), "=m" (*m)

	: "rI" (val), "m" (*m) : "memory");



	return val;

}



static inline unsigned long

__xchg_u64_local(volatile long *m, unsigned long val)

{

	unsigned long dummy;



	__asm__ __volatile__(

	"1:	ldq_l %0,%4\n"

	"	bis $31,%3,%1\n"

	"	stq_c %1,%2\n"

	"	beq %1,2f\n"

	".subsection 2\n"

	"2:	br 1b\n"

	".previous"

	: "=&r" (val), "=&r" (dummy), "=m" (*m)

	: "rI" (val), "m" (*m) : "memory");



	return val;

}



#define __xchg_local(ptr, x, size) \

({ \

	unsigned long __xchg__res; \

	volatile void *__xchg__ptr = (ptr); \

	switch (size) { \

		case 1: __xchg__res = __xchg_u8_local(__xchg__ptr, x); break; \

		case 2: __xchg__res = __xchg_u16_local(__xchg__ptr, x); break; \

		case 4: __xchg__res = __xchg_u32_local(__xchg__ptr, x); break; \

		case 8: __xchg__res = __xchg_u64_local(__xchg__ptr, x); break; \

		default: __xchg_called_with_bad_pointer(); __xchg__res = x; \

	} \

	__xchg__res; \

})



#define xchg_local(ptr,x)						     \

  ({									     \

     __typeof__(*(ptr)) _x_ = (x);					     \

     (__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_,	     \

     		sizeof(*(ptr))); \

  })



#define tas(ptr) (xchg((ptr),1))
@@ -596,6 +701,128 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) 
				    (unsigned long)_n_, sizeof(*(ptr))); \

  })



static inline unsigned long

__cmpxchg_u8_local(volatile char *m, long old, long new)

{

	unsigned long prev, tmp, cmp, addr64;



	__asm__ __volatile__(

	"	andnot	%5,7,%4\n"

	"	insbl	%1,%5,%1\n"

	"1:	ldq_l	%2,0(%4)\n"

	"	extbl	%2,%5,%0\n"

	"	cmpeq	%0,%6,%3\n"

	"	beq	%3,2f\n"

	"	mskbl	%2,%5,%2\n"

	"	or	%1,%2,%2\n"

	"	stq_c	%2,0(%4)\n"

	"	beq	%2,3f\n"

	"2:\n"

	".subsection 2\n"

	"3:	br	1b\n"

	".previous"

	: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)

	: "r" ((long)m), "Ir" (old), "1" (new) : "memory");



	return prev;

}



static inline unsigned long

__cmpxchg_u16_local(volatile short *m, long old, long new)

{

	unsigned long prev, tmp, cmp, addr64;



	__asm__ __volatile__(

	"	andnot	%5,7,%4\n"

	"	inswl	%1,%5,%1\n"

	"1:	ldq_l	%2,0(%4)\n"

	"	extwl	%2,%5,%0\n"

	"	cmpeq	%0,%6,%3\n"

	"	beq	%3,2f\n"

	"	mskwl	%2,%5,%2\n"

	"	or	%1,%2,%2\n"

	"	stq_c	%2,0(%4)\n"

	"	beq	%2,3f\n"

	"2:\n"

	".subsection 2\n"

	"3:	br	1b\n"

	".previous"

	: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)

	: "r" ((long)m), "Ir" (old), "1" (new) : "memory");



	return prev;

}



static inline unsigned long

__cmpxchg_u32_local(volatile int *m, int old, int new)

{

	unsigned long prev, cmp;



	__asm__ __volatile__(

	"1:	ldl_l %0,%5\n"

	"	cmpeq %0,%3,%1\n"

	"	beq %1,2f\n"

	"	mov %4,%1\n"

	"	stl_c %1,%2\n"

	"	beq %1,3f\n"

	"2:\n"

	".subsection 2\n"

	"3:	br 1b\n"

	".previous"

	: "=&r"(prev), "=&r"(cmp), "=m"(*m)

	: "r"((long) old), "r"(new), "m"(*m) : "memory");



	return prev;

}



static inline unsigned long

__cmpxchg_u64_local(volatile long *m, unsigned long old, unsigned long new)

{

	unsigned long prev, cmp;



	__asm__ __volatile__(

	"1:	ldq_l %0,%5\n"

	"	cmpeq %0,%3,%1\n"

	"	beq %1,2f\n"

	"	mov %4,%1\n"

	"	stq_c %1,%2\n"

	"	beq %1,3f\n"

	"2:\n"

	".subsection 2\n"

	"3:	br 1b\n"

	".previous"

	: "=&r"(prev), "=&r"(cmp), "=m"(*m)

	: "r"((long) old), "r"(new), "m"(*m) : "memory");



	return prev;

}



static __always_inline unsigned long

__cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,

		int size)

{

	switch (size) {

		case 1:

			return __cmpxchg_u8_local(ptr, old, new);

		case 2:

			return __cmpxchg_u16_local(ptr, old, new);

		case 4:

			return __cmpxchg_u32_local(ptr, old, new);

		case 8:

			return __cmpxchg_u64_local(ptr, old, new);

	}

	__cmpxchg_called_with_bad_pointer();

	return old;

}



#define cmpxchg_local(ptr,o,n)						 \

  ({									 \

     __typeof__(*(ptr)) _o_ = (o);					 \

     __typeof__(*(ptr)) _n_ = (n);					 \

     (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_,	 \

				    (unsigned long)_n_, sizeof(*(ptr))); \

  })



#endif /* __ASSEMBLY__ */



#define arch_align_stack(x) (x)