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/*
* Copyright (C) 1996 Paul Mackerras.
*/
#include <linux/kernel.h>
#include <asm/bitops.h>
/*
* If the bitops are not inlined in bitops.h, they are defined here.
* -- paulus
*/
#if !__INLINE_BITOPS
void set_bit(int nr, volatile void * addr)
{
unsigned long old;
unsigned long mask = 1 << (nr & 0x1f);
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
__asm__ __volatile__(SMP_WMB "\
1: lwarx %0,0,%3
or %0,%0,%2
stwcx. %0,0,%3
bne 1b"
SMP_MB
: "=&r" (old), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc" );
}
void clear_bit(int nr, volatile void *addr)
{
unsigned long old;
unsigned long mask = 1 << (nr & 0x1f);
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
__asm__ __volatile__(SMP_WMB "\
1: lwarx %0,0,%3
andc %0,%0,%2
stwcx. %0,0,%3
bne 1b"
SMP_MB
: "=&r" (old), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc");
}
void change_bit(int nr, volatile void *addr)
{
unsigned long old;
unsigned long mask = 1 << (nr & 0x1f);
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
__asm__ __volatile__(SMP_WMB "\
1: lwarx %0,0,%3
xor %0,%0,%2
stwcx. %0,0,%3
bne 1b"
SMP_MB
: "=&r" (old), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc");
}
int test_and_set_bit(int nr, volatile void *addr)
{
unsigned int old, t;
unsigned int mask = 1 << (nr & 0x1f);
volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
__asm__ __volatile__(SMP_WMB "\
1: lwarx %0,0,%4
or %1,%0,%3
stwcx. %1,0,%4
bne 1b"
SMP_MB
: "=&r" (old), "=&r" (t), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc");
return (old & mask) != 0;
}
int test_and_clear_bit(int nr, volatile void *addr)
{
unsigned int old, t;
unsigned int mask = 1 << (nr & 0x1f);
volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
__asm__ __volatile__(SMP_WMB "\
1: lwarx %0,0,%4
andc %1,%0,%3
stwcx. %1,0,%4
bne 1b"
SMP_MB
: "=&r" (old), "=&r" (t), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc");
return (old & mask) != 0;
}
int test_and_change_bit(int nr, volatile void *addr)
{
unsigned int old, t;
unsigned int mask = 1 << (nr & 0x1f);
volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
__asm__ __volatile__(SMP_WMB "\
1: lwarx %0,0,%4
xor %1,%0,%3
stwcx. %1,0,%4
bne 1b"
SMP_MB
: "=&r" (old), "=&r" (t), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc");
return (old & mask) != 0;
}
#endif /* !__INLINE_BITOPS */
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