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bitops.h

#ifndef _M68KNOMMU_BITOPS_H
#define _M68KNOMMU_BITOPS_H

/*
 * Copyright 1992, Linus Torvalds.
 */

#include <linux/compiler.h>
#include <asm/byteorder.h>    /* swab32 */

#ifdef __KERNEL__

#ifndef _LINUX_BITOPS_H
#error only <linux/bitops.h> can be included directly
#endif

#if defined (__mcfisaaplus__) || defined (__mcfisac__)
static inline int ffs(unsigned int val)
{
        if (!val)
                return 0;

        asm volatile(
                        "bitrev %0\n\t"
                        "ff1 %0\n\t"
                        : "=d" (val)
                        : "0" (val)
                );
        val++;
        return val;
}

static inline int __ffs(unsigned int val)
{
        asm volatile(
                        "bitrev %0\n\t"
                        "ff1 %0\n\t"
                        : "=d" (val)
                        : "0" (val)
                );
        return val;
}

#else
#include <asm-generic/bitops/ffs.h>
#include <asm-generic/bitops/__ffs.h>
#endif

#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/ffz.h>

static __inline__ void set_bit(int nr, volatile unsigned long * addr)
{
#ifdef CONFIG_COLDFIRE
      __asm__ __volatile__ ("lea %0,%%a0; bset %1,(%%a0)"
           : "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "d" (nr)
           : "%a0", "cc");
#else
      __asm__ __volatile__ ("bset %1,%0"
           : "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "di" (nr)
           : "cc");
#endif
}

#define __set_bit(nr, addr) set_bit(nr, addr)

/*
 * clear_bit() doesn't provide any barrier for the compiler.
 */
#define smp_mb__before_clear_bit()  barrier()
#define smp_mb__after_clear_bit()   barrier()

static __inline__ void clear_bit(int nr, volatile unsigned long * addr)
{
#ifdef CONFIG_COLDFIRE
      __asm__ __volatile__ ("lea %0,%%a0; bclr %1,(%%a0)"
           : "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "d" (nr)
           : "%a0", "cc");
#else
      __asm__ __volatile__ ("bclr %1,%0"
           : "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "di" (nr)
           : "cc");
#endif
}

#define __clear_bit(nr, addr) clear_bit(nr, addr)

static __inline__ void change_bit(int nr, volatile unsigned long * addr)
{
#ifdef CONFIG_COLDFIRE
      __asm__ __volatile__ ("lea %0,%%a0; bchg %1,(%%a0)"
           : "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "d" (nr)
           : "%a0", "cc");
#else
      __asm__ __volatile__ ("bchg %1,%0"
           : "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "di" (nr)
           : "cc");
#endif
}

#define __change_bit(nr, addr) change_bit(nr, addr)

static __inline__ int test_and_set_bit(int nr, volatile unsigned long * addr)
{
      char retval;

#ifdef CONFIG_COLDFIRE
      __asm__ __volatile__ ("lea %1,%%a0; bset %2,(%%a0); sne %0"
           : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "d" (nr)
           : "%a0");
#else
      __asm__ __volatile__ ("bset %2,%1; sne %0"
           : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "di" (nr)
           /* No clobber */);
#endif

      return retval;
}

#define __test_and_set_bit(nr, addr) test_and_set_bit(nr, addr)

static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr)
{
      char retval;

#ifdef CONFIG_COLDFIRE
      __asm__ __volatile__ ("lea %1,%%a0; bclr %2,(%%a0); sne %0"
           : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "d" (nr)
           : "%a0");
#else
      __asm__ __volatile__ ("bclr %2,%1; sne %0"
           : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "di" (nr)
           /* No clobber */);
#endif

      return retval;
}

#define __test_and_clear_bit(nr, addr) test_and_clear_bit(nr, addr)

static __inline__ int test_and_change_bit(int nr, volatile unsigned long * addr)
{
      char retval;

#ifdef CONFIG_COLDFIRE
      __asm__ __volatile__ ("lea %1,%%a0\n\tbchg %2,(%%a0)\n\tsne %0"
           : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "d" (nr)
           : "%a0");
#else
      __asm__ __volatile__ ("bchg %2,%1; sne %0"
           : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
           : "di" (nr)
           /* No clobber */);
#endif

      return retval;
}

#define __test_and_change_bit(nr, addr) test_and_change_bit(nr, addr)

/*
 * This routine doesn't need to be atomic.
 */
static __inline__ int __constant_test_bit(int nr, const volatile unsigned long * addr)
{
      return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
}

static __inline__ int __test_bit(int nr, const volatile unsigned long * addr)
{
      int   * a = (int *) addr;
      int   mask;

      a += nr >> 5;
      mask = 1 << (nr & 0x1f);
      return ((mask & *a) != 0);
}

#define test_bit(nr,addr) \
(__builtin_constant_p(nr) ? \
 __constant_test_bit((nr),(addr)) : \
 __test_bit((nr),(addr)))

#include <asm-generic/bitops/find.h>
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/lock.h>

static __inline__ int ext2_set_bit(int nr, volatile void * addr)
{
      char retval;

#ifdef CONFIG_COLDFIRE
      __asm__ __volatile__ ("lea %1,%%a0; bset %2,(%%a0); sne %0"
           : "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
           : "d" (nr)
           : "%a0");
#else
      __asm__ __volatile__ ("bset %2,%1; sne %0"
           : "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
           : "di" (nr)
           /* No clobber */);
#endif

      return retval;
}

static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
{
      char retval;

#ifdef CONFIG_COLDFIRE
      __asm__ __volatile__ ("lea %1,%%a0; bclr %2,(%%a0); sne %0"
           : "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
           : "d" (nr)
           : "%a0");
#else
      __asm__ __volatile__ ("bclr %2,%1; sne %0"
           : "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
           : "di" (nr)
           /* No clobber */);
#endif

      return retval;
}

#define ext2_set_bit_atomic(lock, nr, addr)           \
      ({                                  \
            int ret;                      \
            spin_lock(lock);              \
            ret = ext2_set_bit((nr), (addr));   \
            spin_unlock(lock);                  \
            ret;                          \
      })

#define ext2_clear_bit_atomic(lock, nr, addr)         \
      ({                                  \
            int ret;                      \
            spin_lock(lock);              \
            ret = ext2_clear_bit((nr), (addr)); \
            spin_unlock(lock);                  \
            ret;                          \
      })

static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
{
      char retval;

#ifdef CONFIG_COLDFIRE
      __asm__ __volatile__ ("lea %1,%%a0; btst %2,(%%a0); sne %0"
           : "=d" (retval)
           : "m" (((const volatile char *)addr)[nr >> 3]), "d" (nr)
           : "%a0");
#else
      __asm__ __volatile__ ("btst %2,%1; sne %0"
           : "=d" (retval)
           : "m" (((const volatile char *)addr)[nr >> 3]), "di" (nr)
           /* No clobber */);
#endif

      return retval;
}

#define ext2_find_first_zero_bit(addr, size) \
        ext2_find_next_zero_bit((addr), (size), 0)

static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
{
      unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
      unsigned long result = offset & ~31UL;
      unsigned long tmp;

      if (offset >= size)
            return size;
      size -= result;
      offset &= 31UL;
      if(offset) {
            /* We hold the little endian value in tmp, but then the
             * shift is illegal. So we could keep a big endian value
             * in tmp, like this:
             *
             * tmp = __swab32(*(p++));
             * tmp |= ~0UL >> (32-offset);
             *
             * but this would decrease performance, so we change the
             * shift:
             */
            tmp = *(p++);
            tmp |= __swab32(~0UL >> (32-offset));
            if(size < 32)
                  goto found_first;
            if(~tmp)
                  goto found_middle;
            size -= 32;
            result += 32;
      }
      while(size & ~31UL) {
            if(~(tmp = *(p++)))
                  goto found_middle;
            result += 32;
            size -= 32;
      }
      if(!size)
            return result;
      tmp = *p;

found_first:
      /* tmp is little endian, so we would have to swab the shift,
       * see above. But then we have to swab tmp below for ffz, so
       * we might as well do this here.
       */
      return result + ffz(__swab32(tmp) | (~0UL << size));
found_middle:
      return result + ffz(__swab32(tmp));
}

#define ext2_find_next_bit(addr, size, off) \
      generic_find_next_le_bit((unsigned long *)(addr), (size), (off))
#include <asm-generic/bitops/minix.h>

#endif /* __KERNEL__ */

#include <asm-generic/bitops/fls.h>
#include <asm-generic/bitops/fls64.h>

#endif /* _M68KNOMMU_BITOPS_H */

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