LXR uboot/arch/m68k/include/asm/bitops.h

   1/*
   2 * bitops.h: Bit string operations on the m68k
   3 */
   4
   5#ifndef _M68K_BITOPS_H
   6#define _M68K_BITOPS_H
   7
   8#include <asm/byteorder.h>
   9#include <asm-generic/bitops/fls.h>
  10#include <asm-generic/bitops/__fls.h>
  11#include <asm-generic/bitops/fls64.h>
  12#include <asm-generic/bitops/__ffs.h>
  13
  14extern void set_bit(int nr, volatile void *addr);
  15extern void clear_bit(int nr, volatile void *addr);
  16extern void change_bit(int nr, volatile void *addr);
  17extern int test_and_clear_bit(int nr, volatile void *addr);
  18extern int test_and_change_bit(int nr, volatile void *addr);
  19
  20#ifdef __KERNEL__
  21
  22
  23static inline int test_bit(int nr, __const__ volatile void *addr)
  24{
  25        __const__ unsigned int *p = (__const__ unsigned int *) addr;
  26
  27        return (p[nr >> 5] & (1UL << (nr & 31))) != 0;
  28}
  29
  30static inline int test_and_set_bit(int nr, volatile void *vaddr)
  31{
  32        char retval;
  33
  34        volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3];
  35        __asm__ __volatile__ ("bset %2,(%4); sne %0"
  36             : "=d" (retval), "=m" (*p)
  37             : "di" (nr & 7), "m" (*p), "a" (p));
  38
  39        return retval;
  40}
  41
  42#define __ffs(x) (ffs(x) - 1)
  43
  44/*
  45 *  * hweightN: returns the hamming weight (i.e. the number
  46 *   * of bits set) of a N-bit word
  47 *    */
  48
  49#define hweight32(x) generic_hweight32(x)
  50#define hweight16(x) generic_hweight16(x)
  51#define hweight8(x) generic_hweight8(x)
  52
  53#endif /* __KERNEL__ */
  54
  55#endif /* _M68K_BITOPS_H */
  56