arch/m68k/include/asm/bitops_mm.h - kernel/msm - Gitiles

 #ifndef _M68K_BITOPS_H
 #define _M68K_BITOPS_H
 /*
  * Copyright 1992, Linus Torvalds.
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file COPYING in the main directory of this archive
  * for more details.
  */

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

 #include <linux/compiler.h>

 /*
  * Require 68020 or better.
  *
  * They use the standard big-endian m680x0 bit ordering.
  */

 #define test_and_set_bit(nr,vaddr) \
   (__builtin_constant_p(nr) ? \
    __constant_test_and_set_bit(nr, vaddr) : \
    __generic_test_and_set_bit(nr, vaddr))

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

 static inline int __constant_test_and_set_bit(int nr, unsigned long *vaddr)
 {
 	char *p = (char *)vaddr + (nr ^ 31) / 8;
 	char retval;

 	__asm__ __volatile__ ("bset %2,%1; sne %0"
 			: "=d" (retval), "+m" (*p)
 			: "di" (nr & 7));

 	return retval;
 }

 static inline int __generic_test_and_set_bit(int nr, unsigned long *vaddr)
 {
 	char retval;

 	__asm__ __volatile__ ("bfset %2{%1:#1}; sne %0"
 			: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");

 	return retval;
 }

 #define set_bit(nr,vaddr) \
   (__builtin_constant_p(nr) ? \
    __constant_set_bit(nr, vaddr) : \
    __generic_set_bit(nr, vaddr))

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

 static inline void __constant_set_bit(int nr, volatile unsigned long *vaddr)
 {
 	char *p = (char *)vaddr + (nr ^ 31) / 8;
 	__asm__ __volatile__ ("bset %1,%0"
 			: "+m" (*p) : "di" (nr & 7));
 }

 static inline void __generic_set_bit(int nr, volatile unsigned long *vaddr)
 {
 	__asm__ __volatile__ ("bfset %1{%0:#1}"
 			: : "d" (nr^31), "o" (*vaddr) : "memory");
 }

 #define test_and_clear_bit(nr,vaddr) \
   (__builtin_constant_p(nr) ? \
    __constant_test_and_clear_bit(nr, vaddr) : \
    __generic_test_and_clear_bit(nr, vaddr))

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

 static inline int __constant_test_and_clear_bit(int nr, unsigned long *vaddr)
 {
 	char *p = (char *)vaddr + (nr ^ 31) / 8;
 	char retval;

 	__asm__ __volatile__ ("bclr %2,%1; sne %0"
 			: "=d" (retval), "+m" (*p)
 			: "di" (nr & 7));

 	return retval;
 }

 static inline int __generic_test_and_clear_bit(int nr, unsigned long *vaddr)
 {
 	char retval;

 	__asm__ __volatile__ ("bfclr %2{%1:#1}; sne %0"
 			: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");

 	return retval;
 }

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

 #define clear_bit(nr,vaddr) \
   (__builtin_constant_p(nr) ? \
    __constant_clear_bit(nr, vaddr) : \
    __generic_clear_bit(nr, vaddr))
 #define __clear_bit(nr,vaddr) clear_bit(nr,vaddr)

 static inline void __constant_clear_bit(int nr, volatile unsigned long *vaddr)
 {
 	char *p = (char *)vaddr + (nr ^ 31) / 8;
 	__asm__ __volatile__ ("bclr %1,%0"
 			: "+m" (*p) : "di" (nr & 7));
 }

 static inline void __generic_clear_bit(int nr, volatile unsigned long *vaddr)
 {
 	__asm__ __volatile__ ("bfclr %1{%0:#1}"
 			: : "d" (nr^31), "o" (*vaddr) : "memory");
 }

 #define test_and_change_bit(nr,vaddr) \
   (__builtin_constant_p(nr) ? \
    __constant_test_and_change_bit(nr, vaddr) : \
    __generic_test_and_change_bit(nr, vaddr))

 #define __test_and_change_bit(nr,vaddr) test_and_change_bit(nr,vaddr)
 #define __change_bit(nr,vaddr) change_bit(nr,vaddr)

 static inline int __constant_test_and_change_bit(int nr, unsigned long *vaddr)
 {
 	char *p = (char *)vaddr + (nr ^ 31) / 8;
 	char retval;

 	__asm__ __volatile__ ("bchg %2,%1; sne %0"
 			: "=d" (retval), "+m" (*p)
 			: "di" (nr & 7));

 	return retval;
 }

 static inline int __generic_test_and_change_bit(int nr, unsigned long *vaddr)
 {
 	char retval;

 	__asm__ __volatile__ ("bfchg %2{%1:#1}; sne %0"
 			: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");

 	return retval;
 }

 #define change_bit(nr,vaddr) \
   (__builtin_constant_p(nr) ? \
    __constant_change_bit(nr, vaddr) : \
    __generic_change_bit(nr, vaddr))

 static inline void __constant_change_bit(int nr, unsigned long *vaddr)
 {
 	char *p = (char *)vaddr + (nr ^ 31) / 8;
 	__asm__ __volatile__ ("bchg %1,%0"
 			: "+m" (*p) : "di" (nr & 7));
 }

 static inline void __generic_change_bit(int nr, unsigned long *vaddr)
 {
 	__asm__ __volatile__ ("bfchg %1{%0:#1}"
 			: : "d" (nr^31), "o" (*vaddr) : "memory");
 }

 static inline int test_bit(int nr, const unsigned long *vaddr)
 {
 	return (vaddr[nr >> 5] & (1UL << (nr & 31))) != 0;
 }

 static inline int find_first_zero_bit(const unsigned long *vaddr,
 				      unsigned size)
 {
 	const unsigned long *p = vaddr;
 	int res = 32;
 	unsigned long num;

 	if (!size)
 		return 0;

 	size = (size + 31) >> 5;
 	while (!(num = ~*p++)) {
 		if (!--size)
 			goto out;
 	}

 	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
 			      : "=d" (res) : "d" (num & -num));
 	res ^= 31;
 out:
 	return ((long)p - (long)vaddr - 4) * 8 + res;
 }

 static inline int find_next_zero_bit(const unsigned long *vaddr, int size,
 				     int offset)
 {
 	const unsigned long *p = vaddr + (offset >> 5);
 	int bit = offset & 31UL, res;

 	if (offset >= size)
 		return size;

 	if (bit) {
 		unsigned long num = ~*p++ & (~0UL << bit);
 		offset -= bit;

 		/* Look for zero in first longword */
 		__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
 				      : "=d" (res) : "d" (num & -num));
 		if (res < 32)
 			return offset + (res ^ 31);
 		offset += 32;
 	}
 	/* No zero yet, search remaining full bytes for a zero */
 	res = find_first_zero_bit(p, size - ((long)p - (long)vaddr) * 8);
 	return offset + res;
 }

 static inline int find_first_bit(const unsigned long *vaddr, unsigned size)
 {
 	const unsigned long *p = vaddr;
 	int res = 32;
 	unsigned long num;

 	if (!size)
 		return 0;

 	size = (size + 31) >> 5;
 	while (!(num = *p++)) {
 		if (!--size)
 			goto out;
 	}

 	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
 			      : "=d" (res) : "d" (num & -num));
 	res ^= 31;
 out:
 	return ((long)p - (long)vaddr - 4) * 8 + res;
 }

 static inline int find_next_bit(const unsigned long *vaddr, int size,
 				int offset)
 {
 	const unsigned long *p = vaddr + (offset >> 5);
 	int bit = offset & 31UL, res;

 	if (offset >= size)
 		return size;

 	if (bit) {
 		unsigned long num = *p++ & (~0UL << bit);
 		offset -= bit;

 		/* Look for one in first longword */
 		__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
 				      : "=d" (res) : "d" (num & -num));
 		if (res < 32)
 			return offset + (res ^ 31);
 		offset += 32;
 	}
 	/* No one yet, search remaining full bytes for a one */
 	res = find_first_bit(p, size - ((long)p - (long)vaddr) * 8);
 	return offset + res;
 }

 /*
  * ffz = Find First Zero in word. Undefined if no zero exists,
  * so code should check against ~0UL first..
  */
 static inline unsigned long ffz(unsigned long word)
 {
 	int res;

 	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
 			      : "=d" (res) : "d" (~word & -~word));
 	return res ^ 31;
 }

 #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)
 {
 	int cnt;

 	asm ("bfffo %1{#0:#0},%0" : "=d" (cnt) : "dm" (x & -x));

 	return 32 - cnt;
 }
 #define __ffs(x) (ffs(x) - 1)

 /*
  * fls: find last bit set.
  */

 static inline int fls(int x)
 {
 	int cnt;

 	asm ("bfffo %1{#0,#0},%0" : "=d" (cnt) : "dm" (x));

 	return 32 - cnt;
 }

 static inline int __fls(int x)
 {
 	return fls(x) - 1;
 }

 #include <asm-generic/bitops/fls64.h>
 #include <asm-generic/bitops/sched.h>
 #include <asm-generic/bitops/hweight.h>
 #include <asm-generic/bitops/lock.h>

 /* Bitmap functions for the minix filesystem */

 static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
 {
 	const unsigned short *p = vaddr, *addr = vaddr;
 	int res;
 	unsigned short num;

 	if (!size)
 		return 0;

 	size = (size >> 4) + ((size & 15) > 0);
 	while (*p++ == 0xffff)
 	{
 		if (--size == 0)
 			return (p - addr) << 4;
 	}

 	num = ~*--p;
 	__asm__ __volatile__ ("bfffo %1{#16,#16},%0"
 			      : "=d" (res) : "d" (num & -num));
 	return ((p - addr) << 4) + (res ^ 31);
 }

 #define minix_test_and_set_bit(nr, addr)	__test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
 #define minix_set_bit(nr,addr)			__set_bit((nr) ^ 16, (unsigned long *)(addr))
 #define minix_test_and_clear_bit(nr, addr)	__test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))

 static inline int minix_test_bit(int nr, const void *vaddr)
 {
 	const unsigned short *p = vaddr;
 	return (p[nr >> 4] & (1U << (nr & 15))) != 0;
 }

 /* Bitmap functions for the ext2 filesystem. */

 #define ext2_set_bit(nr, addr)			__test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
 #define ext2_set_bit_atomic(lock, nr, addr)	test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
 #define ext2_clear_bit(nr, addr)		__test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
 #define ext2_clear_bit_atomic(lock, nr, addr)	test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))

 static inline int ext2_test_bit(int nr, const void *vaddr)
 {
 	const unsigned char *p = vaddr;
 	return (p[nr >> 3] & (1U << (nr & 7))) != 0;
 }

 static inline int ext2_find_first_zero_bit(const void *vaddr, unsigned size)
 {
 	const unsigned long *p = vaddr, *addr = vaddr;
 	int res;

 	if (!size)
 		return 0;

 	size = (size >> 5) + ((size & 31) > 0);
 	while (*p++ == ~0UL)
 	{
 		if (--size == 0)
 			return (p - addr) << 5;
 	}

 	--p;
 	for (res = 0; res < 32; res++)
 		if (!ext2_test_bit (res, p))
 			break;
 	return (p - addr) * 32 + res;
 }

 static inline int ext2_find_next_zero_bit(const void *vaddr, unsigned size,
 					  unsigned offset)
 {
 	const unsigned long *addr = vaddr;
 	const unsigned long *p = addr + (offset >> 5);
 	int bit = offset & 31UL, res;

 	if (offset >= size)
 		return size;

 	if (bit) {
 		/* Look for zero in first longword */
 		for (res = bit; res < 32; res++)
 			if (!ext2_test_bit (res, p))
 				return (p - addr) * 32 + res;
 		p++;
 	}
 	/* No zero yet, search remaining full bytes for a zero */
 	res = ext2_find_first_zero_bit (p, size - 32 * (p - addr));
 	return (p - addr) * 32 + res;
 }

 static inline int ext2_find_first_bit(const void *vaddr, unsigned size)
 {
 	const unsigned long *p = vaddr, *addr = vaddr;
 	int res;

 	if (!size)
 		return 0;

 	size = (size >> 5) + ((size & 31) > 0);
 	while (*p++ == 0UL) {
 		if (--size == 0)
 			return (p - addr) << 5;
 	}

 	--p;
 	for (res = 0; res < 32; res++)
 		if (ext2_test_bit(res, p))
 			break;
 	return (p - addr) * 32 + res;
 }

 static inline int ext2_find_next_bit(const void *vaddr, unsigned size,
 				     unsigned offset)
 {
 	const unsigned long *addr = vaddr;
 	const unsigned long *p = addr + (offset >> 5);
 	int bit = offset & 31UL, res;

 	if (offset >= size)
 		return size;

 	if (bit) {
 		/* Look for one in first longword */
 		for (res = bit; res < 32; res++)
 			if (ext2_test_bit(res, p))
 				return (p - addr) * 32 + res;
 		p++;
 	}
 	/* No set bit yet, search remaining full bytes for a set bit */
 	res = ext2_find_first_bit(p, size - 32 * (p - addr));
 	return (p - addr) * 32 + res;
 }

 #endif /* __KERNEL__ */

 #endif /* _M68K_BITOPS_H */
	#ifndef _M68K_BITOPS_H
	#define _M68K_BITOPS_H
	/*
	* Copyright 1992, Linus Torvalds.
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file COPYING in the main directory of this archive
	* for more details.
	*/

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

	#include <linux/compiler.h>

	/*
	* Require 68020 or better.
	*
	* They use the standard big-endian m680x0 bit ordering.
	*/

	#define test_and_set_bit(nr,vaddr) \
	(__builtin_constant_p(nr) ? \
	__constant_test_and_set_bit(nr, vaddr) : \
	__generic_test_and_set_bit(nr, vaddr))

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

	static inline int __constant_test_and_set_bit(int nr, unsigned long *vaddr)
	{
	char p = (char )vaddr + (nr ^ 31) / 8;
	char retval;

	__asm__ __volatile__ ("bset %2,%1; sne %0"
	: "=d" (retval), "+m" (*p)
	: "di" (nr & 7));

	return retval;
	}

	static inline int __generic_test_and_set_bit(int nr, unsigned long *vaddr)
	{
	char retval;

	__asm__ __volatile__ ("bfset %2{%1:#1}; sne %0"
	: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");

	return retval;
	}

	#define set_bit(nr,vaddr) \
	(__builtin_constant_p(nr) ? \
	__constant_set_bit(nr, vaddr) : \
	__generic_set_bit(nr, vaddr))

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

	static inline void __constant_set_bit(int nr, volatile unsigned long *vaddr)
	{
	char p = (char )vaddr + (nr ^ 31) / 8;
	__asm__ __volatile__ ("bset %1,%0"
	: "+m" (*p) : "di" (nr & 7));
	}

	static inline void __generic_set_bit(int nr, volatile unsigned long *vaddr)
	{
	__asm__ __volatile__ ("bfset %1{%0:#1}"
	: : "d" (nr^31), "o" (*vaddr) : "memory");
	}

	#define test_and_clear_bit(nr,vaddr) \
	(__builtin_constant_p(nr) ? \
	__constant_test_and_clear_bit(nr, vaddr) : \
	__generic_test_and_clear_bit(nr, vaddr))

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

	static inline int __constant_test_and_clear_bit(int nr, unsigned long *vaddr)
	{
	char p = (char )vaddr + (nr ^ 31) / 8;
	char retval;

	__asm__ __volatile__ ("bclr %2,%1; sne %0"
	: "=d" (retval), "+m" (*p)
	: "di" (nr & 7));

	return retval;
	}

	static inline int __generic_test_and_clear_bit(int nr, unsigned long *vaddr)
	{
	char retval;

	__asm__ __volatile__ ("bfclr %2{%1:#1}; sne %0"
	: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");

	return retval;
	}

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

	#define clear_bit(nr,vaddr) \
	(__builtin_constant_p(nr) ? \
	__constant_clear_bit(nr, vaddr) : \
	__generic_clear_bit(nr, vaddr))
	#define __clear_bit(nr,vaddr) clear_bit(nr,vaddr)

	static inline void __constant_clear_bit(int nr, volatile unsigned long *vaddr)
	{
	char p = (char )vaddr + (nr ^ 31) / 8;
	__asm__ __volatile__ ("bclr %1,%0"
	: "+m" (*p) : "di" (nr & 7));
	}

	static inline void __generic_clear_bit(int nr, volatile unsigned long *vaddr)
	{
	__asm__ __volatile__ ("bfclr %1{%0:#1}"
	: : "d" (nr^31), "o" (*vaddr) : "memory");
	}

	#define test_and_change_bit(nr,vaddr) \
	(__builtin_constant_p(nr) ? \
	__constant_test_and_change_bit(nr, vaddr) : \
	__generic_test_and_change_bit(nr, vaddr))

	#define __test_and_change_bit(nr,vaddr) test_and_change_bit(nr,vaddr)
	#define __change_bit(nr,vaddr) change_bit(nr,vaddr)

	static inline int __constant_test_and_change_bit(int nr, unsigned long *vaddr)
	{
	char p = (char )vaddr + (nr ^ 31) / 8;
	char retval;

	__asm__ __volatile__ ("bchg %2,%1; sne %0"
	: "=d" (retval), "+m" (*p)
	: "di" (nr & 7));

	return retval;
	}

	static inline int __generic_test_and_change_bit(int nr, unsigned long *vaddr)
	{
	char retval;

	__asm__ __volatile__ ("bfchg %2{%1:#1}; sne %0"
	: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");

	return retval;
	}

	#define change_bit(nr,vaddr) \
	(__builtin_constant_p(nr) ? \
	__constant_change_bit(nr, vaddr) : \
	__generic_change_bit(nr, vaddr))

	static inline void __constant_change_bit(int nr, unsigned long *vaddr)
	{
	char p = (char )vaddr + (nr ^ 31) / 8;
	__asm__ __volatile__ ("bchg %1,%0"
	: "+m" (*p) : "di" (nr & 7));
	}

	static inline void __generic_change_bit(int nr, unsigned long *vaddr)
	{
	__asm__ __volatile__ ("bfchg %1{%0:#1}"
	: : "d" (nr^31), "o" (*vaddr) : "memory");
	}

	static inline int test_bit(int nr, const unsigned long *vaddr)
	{
	return (vaddr[nr >> 5] & (1UL << (nr & 31))) != 0;
	}

	static inline int find_first_zero_bit(const unsigned long *vaddr,
	unsigned size)
	{
	const unsigned long *p = vaddr;
	int res = 32;
	unsigned long num;

	if (!size)
	return 0;

	size = (size + 31) >> 5;
	while (!(num = ~*p++)) {
	if (!--size)
	goto out;
	}

	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
	: "=d" (res) : "d" (num & -num));
	res ^= 31;
	out:
	return ((long)p - (long)vaddr - 4) * 8 + res;
	}

	static inline int find_next_zero_bit(const unsigned long *vaddr, int size,
	int offset)
	{
	const unsigned long *p = vaddr + (offset >> 5);
	int bit = offset & 31UL, res;

	if (offset >= size)
	return size;

	if (bit) {
	unsigned long num = ~*p++ & (~0UL << bit);
	offset -= bit;

	/* Look for zero in first longword */
	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
	: "=d" (res) : "d" (num & -num));
	if (res < 32)
	return offset + (res ^ 31);
	offset += 32;
	}
	/* No zero yet, search remaining full bytes for a zero */
	res = find_first_zero_bit(p, size - ((long)p - (long)vaddr) * 8);
	return offset + res;
	}

	static inline int find_first_bit(const unsigned long *vaddr, unsigned size)
	{
	const unsigned long *p = vaddr;
	int res = 32;
	unsigned long num;

	if (!size)
	return 0;

	size = (size + 31) >> 5;
	while (!(num = *p++)) {
	if (!--size)
	goto out;
	}

	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
	: "=d" (res) : "d" (num & -num));
	res ^= 31;
	out:
	return ((long)p - (long)vaddr - 4) * 8 + res;
	}

	static inline int find_next_bit(const unsigned long *vaddr, int size,
	int offset)
	{
	const unsigned long *p = vaddr + (offset >> 5);
	int bit = offset & 31UL, res;

	if (offset >= size)
	return size;

	if (bit) {
	unsigned long num = *p++ & (~0UL << bit);
	offset -= bit;

	/* Look for one in first longword */
	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
	: "=d" (res) : "d" (num & -num));
	if (res < 32)
	return offset + (res ^ 31);
	offset += 32;
	}
	/* No one yet, search remaining full bytes for a one */
	res = find_first_bit(p, size - ((long)p - (long)vaddr) * 8);
	return offset + res;
	}

	/*
	* ffz = Find First Zero in word. Undefined if no zero exists,
	* so code should check against ~0UL first..
	*/
	static inline unsigned long ffz(unsigned long word)
	{
	int res;

	__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
	: "=d" (res) : "d" (~word & -~word));
	return res ^ 31;
	}

	#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)
	{
	int cnt;

	asm ("bfffo %1{#0:#0},%0" : "=d" (cnt) : "dm" (x & -x));

	return 32 - cnt;
	}
	#define __ffs(x) (ffs(x) - 1)

	/*
	* fls: find last bit set.
	*/

	static inline int fls(int x)
	{
	int cnt;

	asm ("bfffo %1{#0,#0},%0" : "=d" (cnt) : "dm" (x));

	return 32 - cnt;
	}

	static inline int __fls(int x)
	{
	return fls(x) - 1;
	}

	#include <asm-generic/bitops/fls64.h>
	#include <asm-generic/bitops/sched.h>
	#include <asm-generic/bitops/hweight.h>
	#include <asm-generic/bitops/lock.h>

	/* Bitmap functions for the minix filesystem */

	static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
	{
	const unsigned short p = vaddr, addr = vaddr;
	int res;
	unsigned short num;

	if (!size)
	return 0;

	size = (size >> 4) + ((size & 15) > 0);
	while (*p++ == 0xffff)
	{
	if (--size == 0)
	return (p - addr) << 4;
	}

	num = ~*--p;
	__asm__ __volatile__ ("bfffo %1{#16,#16},%0"
	: "=d" (res) : "d" (num & -num));
	return ((p - addr) << 4) + (res ^ 31);
	}

	#define minix_test_and_set_bit(nr, addr) __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
	#define minix_set_bit(nr,addr) __set_bit((nr) ^ 16, (unsigned long *)(addr))
	#define minix_test_and_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))

	static inline int minix_test_bit(int nr, const void *vaddr)
	{
	const unsigned short *p = vaddr;
	return (p[nr >> 4] & (1U << (nr & 15))) != 0;
	}

	/* Bitmap functions for the ext2 filesystem. */

	#define ext2_set_bit(nr, addr) __test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
	#define ext2_set_bit_atomic(lock, nr, addr) test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
	#define ext2_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
	#define ext2_clear_bit_atomic(lock, nr, addr) test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))

	static inline int ext2_test_bit(int nr, const void *vaddr)
	{
	const unsigned char *p = vaddr;
	return (p[nr >> 3] & (1U << (nr & 7))) != 0;
	}

	static inline int ext2_find_first_zero_bit(const void *vaddr, unsigned size)
	{
	const unsigned long p = vaddr, addr = vaddr;
	int res;

	if (!size)
	return 0;

	size = (size >> 5) + ((size & 31) > 0);
	while (*p++ == ~0UL)
	{
	if (--size == 0)
	return (p - addr) << 5;
	}

	--p;
	for (res = 0; res < 32; res++)
	if (!ext2_test_bit (res, p))
	break;
	return (p - addr) * 32 + res;
	}

	static inline int ext2_find_next_zero_bit(const void *vaddr, unsigned size,
	unsigned offset)
	{
	const unsigned long *addr = vaddr;
	const unsigned long *p = addr + (offset >> 5);
	int bit = offset & 31UL, res;

	if (offset >= size)
	return size;

	if (bit) {
	/* Look for zero in first longword */
	for (res = bit; res < 32; res++)
	if (!ext2_test_bit (res, p))
	return (p - addr) * 32 + res;
	p++;
	}
	/* No zero yet, search remaining full bytes for a zero */
	res = ext2_find_first_zero_bit (p, size - 32 * (p - addr));
	return (p - addr) * 32 + res;
	}

	static inline int ext2_find_first_bit(const void *vaddr, unsigned size)
	{
	const unsigned long p = vaddr, addr = vaddr;
	int res;

	if (!size)
	return 0;

	size = (size >> 5) + ((size & 31) > 0);
	while (*p++ == 0UL) {
	if (--size == 0)
	return (p - addr) << 5;
	}

	--p;
	for (res = 0; res < 32; res++)
	if (ext2_test_bit(res, p))
	break;
	return (p - addr) * 32 + res;
	}

	static inline int ext2_find_next_bit(const void *vaddr, unsigned size,
	unsigned offset)
	{
	const unsigned long *addr = vaddr;
	const unsigned long *p = addr + (offset >> 5);
	int bit = offset & 31UL, res;

	if (offset >= size)
	return size;

	if (bit) {
	/* Look for one in first longword */
	for (res = bit; res < 32; res++)
	if (ext2_test_bit(res, p))
	return (p - addr) * 32 + res;
	p++;
	}
	/* No set bit yet, search remaining full bytes for a set bit */
	res = ext2_find_first_bit(p, size - 32 * (p - addr));
	return (p - addr) * 32 + res;
	}

	#endif /* __KERNEL__ */

	#endif /* _M68K_BITOPS_H */