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/*
* bitops.h: Bit string operations on the ppc
*/
#ifndef _PPC_BITOPS_H
#define _PPC_BITOPS_H
#include <asm/byteorder.h>
#include <asm-generic/bitops/ops.h>
/*
* Arguably these bit operations don't imply any memory barrier or
* SMP ordering, but in fact a lot of drivers expect them to imply
* both, since they do on x86 cpus.
*/
#ifdef CONFIG_SMP
#define SMP_WMB "eieio\n"
#define SMP_MB "\nsync"
#else
#define SMP_WMB
#define SMP_MB
#endif /* CONFIG_SMP */
#define __INLINE_BITOPS 1
#if __INLINE_BITOPS
/*
* These used to be if'd out here because using : "cc" as a constraint
* resulted in errors from egcs. Things may be OK with gcc-2.95.
*/
static inline 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\n\
or %0,%0,%2\n\
stwcx. %0,0,%3\n\
bne 1b"
SMP_MB
: "=&r" (old), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc" );
}
static inline 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\n\
andc %0,%0,%2\n\
stwcx. %0,0,%3\n\
bne 1b"
SMP_MB
: "=&r" (old), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc");
}
static inline 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\n\
xor %0,%0,%2\n\
stwcx. %0,0,%3\n\
bne 1b"
SMP_MB
: "=&r" (old), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc");
}
static inline 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\n\
or %1,%0,%3\n\
stwcx. %1,0,%4\n\
bne 1b"
SMP_MB
: "=&r" (old), "=&r" (t), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc");
return (old & mask) != 0;
}
static inline 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\n\
andc %1,%0,%3\n\
stwcx. %1,0,%4\n\
bne 1b"
SMP_MB
: "=&r" (old), "=&r" (t), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc");
return (old & mask) != 0;
}
static inline 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\n\
xor %1,%0,%3\n\
stwcx. %1,0,%4\n\
bne 1b"
SMP_MB
: "=&r" (old), "=&r" (t), "=m" (*p)
: "r" (mask), "r" (p), "m" (*p)
: "cc");
return (old & mask) != 0;
}
#endif /* __INLINE_BITOPS */
/* Return the bit position of the most significant 1 bit in a word */
static inline int __ilog2(unsigned int x)
{
int lz;
asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
return 31 - lz;
}
static inline int ffz(unsigned int x)
{
if ((x = ~x) == 0)
return 32;
return __ilog2(x & -x);
}
static inline int __ffs(unsigned long x)
{
return __ilog2(x & -x);
}
/*
* fls: find last (most-significant) bit set.
* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
*/
static inline int fls(unsigned int x)
{
int lz;
asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
return 32 - lz;
}
#ifdef __KERNEL__
/*
* ffs: find first bit set. This is defined the same way as
* the libc and compiler builtin ffs routines, therefore
* differs in spirit from the above ffz (man ffs).
*/
static inline int ffs(int x)
{
return __ilog2(x & -x) + 1;
}
#include <asm-generic/bitops/fls64.h>
#include <asm-generic/bitops/hweight.h>
#endif /* __KERNEL__ */
#include <asm-generic/bitops/find.h>
#endif /* _PPC_BITOPS_H */
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