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/* $Id: atomic.h,v 1.15 1997/07/03 09:18:09 davem Exp $
* atomic.h: Thankfully the V9 is at least reasonable for this
* stuff.
*
* Copyright (C) 1996, 1997 David S. Miller (davem@caip.rutgers.edu)
*/
#ifndef __ARCH_SPARC64_ATOMIC__
#define __ARCH_SPARC64_ATOMIC__
/* Make sure gcc doesn't try to be clever and move things around
* on us. We need to use _exactly_ the address the user gave us,
* not some alias that contains the same information.
*/
#define __atomic_fool_gcc(x) ((struct { int a[100]; } *)x)
typedef struct { int counter; } atomic_t;
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) ((v)->counter)
#define atomic_set(v, i) (((v)->counter) = i)
extern __inline__ void atomic_add(int i, atomic_t *v)
{
__asm__ __volatile__("
1: lduw [%1], %%g1
add %%g1, %0, %%g2
cas [%1], %%g1, %%g2
sub %%g1, %%g2, %%g1
brnz,pn %%g1, 1b
nop"
: /* No outputs */
: "HIr" (i), "r" (__atomic_fool_gcc(v))
: "g1", "g2");
}
extern __inline__ void atomic_sub(int i, atomic_t *v)
{
__asm__ __volatile__("
1: lduw [%1], %%g1
sub %%g1, %0, %%g2
cas [%1], %%g1, %%g2
sub %%g1, %%g2, %%g1
brnz,pn %%g1, 1b
nop"
: /* No outputs */
: "HIr" (i), "r" (__atomic_fool_gcc(v))
: "g1", "g2");
}
/* Same as above, but return the result value. */
extern __inline__ int atomic_add_return(int i, atomic_t *v)
{
unsigned long oldval;
__asm__ __volatile__("
1: lduw [%2], %%g1
add %%g1, %1, %%g2
cas [%2], %%g1, %%g2
sub %%g1, %%g2, %%g1
brnz,pn %%g1, 1b
add %%g2, %1, %0"
: "=&r" (oldval)
: "HIr" (i), "r" (__atomic_fool_gcc(v))
: "g1", "g2");
return (int)oldval;
}
extern __inline__ int atomic_sub_return(int i, atomic_t *v)
{
unsigned long oldval;
__asm__ __volatile__("
1: lduw [%2], %%g1
sub %%g1, %1, %%g2
cas [%2], %%g1, %%g2
sub %%g1, %%g2, %%g1
brnz,pn %%g1, 1b
sub %%g2, %1, %0"
: "=&r" (oldval)
: "HIr" (i), "r" (__atomic_fool_gcc(v))
: "g1", "g2");
return (int)oldval;
}
#define atomic_dec_return(v) atomic_sub_return(1,(v))
#define atomic_inc_return(v) atomic_add_return(1,(v))
#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
#define atomic_inc(v) atomic_add(1,(v))
#define atomic_dec(v) atomic_sub(1,(v))
#endif /* !(__ARCH_SPARC64_ATOMIC__) */
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