include/asm-sparc/bitops.h - pub/scm/linux/kernel/git/pavel/linux-n900 - Git at Google

 /* $Id: bitops.h,v 1.67 2001/11/19 18:36:34 davem Exp $
  * bitops.h: Bit string operations on the Sparc.
  *
  * Copyright 1995 David S. Miller (davem@caip.rutgers.edu)
  * Copyright 1996 Eddie C. Dost   (ecd@skynet.be)
  * Copyright 2001 Anton Blanchard (anton@samba.org)
  */

 #ifndef _SPARC_BITOPS_H
 #define _SPARC_BITOPS_H

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

 #ifdef __KERNEL__

 /*
  * Set bit 'nr' in 32-bit quantity at address 'addr' where bit '0'
  * is in the highest of the four bytes and bit '31' is the high bit
  * within the first byte. Sparc is BIG-Endian. Unless noted otherwise
  * all bit-ops return 0 if bit was previously clear and != 0 otherwise.
  */
 static inline int test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	register unsigned long mask asm("g2");
 	register unsigned long *ADDR asm("g1");
 	register int tmp1 asm("g3");
 	register int tmp2 asm("g4");
 	register int tmp3 asm("g5");
 	register int tmp4 asm("g7");

 	ADDR = ((unsigned long *) addr) + (nr >> 5);
 	mask = 1 << (nr & 31);

 	__asm__ __volatile__(
 	"mov	%%o7, %%g4\n\t"
 	"call	___set_bit\n\t"
 	" add	%%o7, 8, %%o7\n"
 	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
 	: "0" (mask), "r" (ADDR)
 	: "memory", "cc");

 	return mask != 0;
 }

 static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	register unsigned long mask asm("g2");
 	register unsigned long *ADDR asm("g1");
 	register int tmp1 asm("g3");
 	register int tmp2 asm("g4");
 	register int tmp3 asm("g5");
 	register int tmp4 asm("g7");

 	ADDR = ((unsigned long *) addr) + (nr >> 5);
 	mask = 1 << (nr & 31);

 	__asm__ __volatile__(
 	"mov	%%o7, %%g4\n\t"
 	"call	___set_bit\n\t"
 	" add	%%o7, 8, %%o7\n"
 	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
 	: "0" (mask), "r" (ADDR)
 	: "memory", "cc");
 }

 static inline int test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	register unsigned long mask asm("g2");
 	register unsigned long *ADDR asm("g1");
 	register int tmp1 asm("g3");
 	register int tmp2 asm("g4");
 	register int tmp3 asm("g5");
 	register int tmp4 asm("g7");

 	ADDR = ((unsigned long *) addr) + (nr >> 5);
 	mask = 1 << (nr & 31);

 	__asm__ __volatile__(
 	"mov	%%o7, %%g4\n\t"
 	"call	___clear_bit\n\t"
 	" add	%%o7, 8, %%o7\n"
 	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
 	: "0" (mask), "r" (ADDR)
 	: "memory", "cc");

 	return mask != 0;
 }

 static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	register unsigned long mask asm("g2");
 	register unsigned long *ADDR asm("g1");
 	register int tmp1 asm("g3");
 	register int tmp2 asm("g4");
 	register int tmp3 asm("g5");
 	register int tmp4 asm("g7");

 	ADDR = ((unsigned long *) addr) + (nr >> 5);
 	mask = 1 << (nr & 31);

 	__asm__ __volatile__(
 	"mov	%%o7, %%g4\n\t"
 	"call	___clear_bit\n\t"
 	" add	%%o7, 8, %%o7\n"
 	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
 	: "0" (mask), "r" (ADDR)
 	: "memory", "cc");
 }

 static inline int test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	register unsigned long mask asm("g2");
 	register unsigned long *ADDR asm("g1");
 	register int tmp1 asm("g3");
 	register int tmp2 asm("g4");
 	register int tmp3 asm("g5");
 	register int tmp4 asm("g7");

 	ADDR = ((unsigned long *) addr) + (nr >> 5);
 	mask = 1 << (nr & 31);

 	__asm__ __volatile__(
 	"mov	%%o7, %%g4\n\t"
 	"call	___change_bit\n\t"
 	" add	%%o7, 8, %%o7\n"
 	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
 	: "0" (mask), "r" (ADDR)
 	: "memory", "cc");

 	return mask != 0;
 }

 static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	register unsigned long mask asm("g2");
 	register unsigned long *ADDR asm("g1");
 	register int tmp1 asm("g3");
 	register int tmp2 asm("g4");
 	register int tmp3 asm("g5");
 	register int tmp4 asm("g7");

 	ADDR = ((unsigned long *) addr) + (nr >> 5);
 	mask = 1 << (nr & 31);

 	__asm__ __volatile__(
 	"mov	%%o7, %%g4\n\t"
 	"call	___change_bit\n\t"
 	" add	%%o7, 8, %%o7\n"
 	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
 	: "0" (mask), "r" (ADDR)
 	: "memory", "cc");
 }

 /*
  * non-atomic versions
  */
 static inline void __set_bit(int nr, volatile unsigned long *addr)
 {
 	unsigned long mask = 1UL << (nr & 0x1f);
 	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);

 	*p |= mask;
 }

 static inline void __clear_bit(int nr, volatile unsigned long *addr)
 {
 	unsigned long mask = 1UL << (nr & 0x1f);
 	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);

 	*p &= ~mask;
 }

 static inline void __change_bit(int nr, volatile unsigned long *addr)
 {
 	unsigned long mask = 1UL << (nr & 0x1f);
 	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);

 	*p ^= mask;
 }

 static inline int __test_and_set_bit(int nr, volatile unsigned long *addr)
 {
 	unsigned long mask = 1UL << (nr & 0x1f);
 	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
 	unsigned long old = *p;

 	*p = old | mask;
 	return (old & mask) != 0;
 }

 static inline int __test_and_clear_bit(int nr, volatile unsigned long *addr)
 {
 	unsigned long mask = 1UL << (nr & 0x1f);
 	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
 	unsigned long old = *p;

 	*p = old & ~mask;
 	return (old & mask) != 0;
 }

 static inline int __test_and_change_bit(int nr, volatile unsigned long *addr)
 {
 	unsigned long mask = 1UL << (nr & 0x1f);
 	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
 	unsigned long old = *p;

 	*p = old ^ mask;
 	return (old & mask) != 0;
 }

 #define smp_mb__before_clear_bit()	do { } while(0)
 #define smp_mb__after_clear_bit()	do { } while(0)

 /* The following routine need not be atomic. */
 static inline int test_bit(int nr, __const__ volatile unsigned long *addr)
 {
 	return (1UL & (((unsigned long *)addr)[nr >> 5] >> (nr & 31))) != 0UL;
 }

 /* The easy/cheese version for now. */
 static inline unsigned long ffz(unsigned long word)
 {
 	unsigned long result = 0;

 	while(word & 1) {
 		result++;
 		word >>= 1;
 	}
 	return result;
 }

 /**
  * __ffs - find first bit in word.
  * @word: The word to search
  *
  * Undefined if no bit exists, so code should check against 0 first.
  */
 static inline int __ffs(unsigned long word)
 {
 	int num = 0;

 	if ((word & 0xffff) == 0) {
 		num += 16;
 		word >>= 16;
 	}
 	if ((word & 0xff) == 0) {
 		num += 8;
 		word >>= 8;
 	}
 	if ((word & 0xf) == 0) {
 		num += 4;
 		word >>= 4;
 	}
 	if ((word & 0x3) == 0) {
 		num += 2;
 		word >>= 2;
 	}
 	if ((word & 0x1) == 0)
 		num += 1;
 	return num;
 }

 /*
  * Every architecture must define this function. It's the fastest
  * way of searching a 140-bit bitmap where the first 100 bits are
  * unlikely to be set. It's guaranteed that at least one of the 140
  * bits is cleared.
  */
 static inline int sched_find_first_bit(unsigned long *b)
 {

 	if (unlikely(b[0]))
 		return __ffs(b[0]);
 	if (unlikely(b[1]))
 		return __ffs(b[1]) + 32;
 	if (unlikely(b[2]))
 		return __ffs(b[2]) + 64;
 	if (b[3])
 		return __ffs(b[3]) + 96;
 	return __ffs(b[4]) + 128;
 }

 /*
  * 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)
 {
 	if (!x)
 		return 0;
 	return __ffs((unsigned long)x) + 1;
 }

 /*
  * fls: find last (most-significant) bit set.
  * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
  */
 #define fls(x) generic_fls(x)

 /*
  * hweightN: returns the hamming weight (i.e. the number
  * of bits set) of a N-bit word
  */
 #define hweight32(x) generic_hweight32(x)
 #define hweight16(x) generic_hweight16(x)
 #define hweight8(x) generic_hweight8(x)

 /*
  * find_next_zero_bit() finds the first zero bit in a bit string of length
  * 'size' bits, starting the search at bit 'offset'. This is largely based
  * on Linus's ALPHA routines, which are pretty portable BTW.
  */
 static inline unsigned long find_next_zero_bit(const unsigned long *addr,
     unsigned long size, unsigned long offset)
 {
 	const unsigned long *p = addr + (offset >> 5);
 	unsigned long result = offset & ~31UL;
 	unsigned long tmp;

 	if (offset >= size)
 		return size;
 	size -= result;
 	offset &= 31UL;
 	if (offset) {
 		tmp = *(p++);
 		tmp |= ~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 |= ~0UL << size;
 	if (tmp == ~0UL)        /* Are any bits zero? */
 		return result + size; /* Nope. */
 found_middle:
 	return result + ffz(tmp);
 }

 /*
  * Linus sez that gcc can optimize the following correctly, we'll see if this
  * holds on the Sparc as it does for the ALPHA.
  */
 #define find_first_zero_bit(addr, size) \
         find_next_zero_bit((addr), (size), 0)

 /**
  * find_next_bit - find the first set bit in a memory region
  * @addr: The address to base the search on
  * @offset: The bitnumber to start searching at
  * @size: The maximum size to search
  *
  * Scheduler induced bitop, do not use.
  */
 static inline int find_next_bit(const unsigned long *addr, int size, int offset)
 {
 	const unsigned long *p = addr + (offset >> 5);
 	int num = offset & ~0x1f;
 	unsigned long word;

 	word = *p++;
 	word &= ~((1 << (offset & 0x1f)) - 1);
 	while (num < size) {
 		if (word != 0) {
 			return __ffs(word) + num;
 		}
 		word = *p++;
 		num += 0x20;
 	}
 	return num;
 }

 /**
  * find_first_bit - find the first set bit in a memory region
  * @addr: The address to start the search at
  * @size: The maximum size to search
  *
  * Returns the bit-number of the first set bit, not the number of the byte
  * containing a bit.
  */
 #define find_first_bit(addr, size) \
 	find_next_bit((addr), (size), 0)

 /*
  */
 static inline int test_le_bit(int nr, __const__ unsigned long * addr)
 {
 	__const__ unsigned char *ADDR = (__const__ unsigned char *) addr;
 	return (ADDR[nr >> 3] >> (nr & 7)) & 1;
 }

 /*
  * non-atomic versions
  */
 static inline void __set_le_bit(int nr, unsigned long *addr)
 {
 	unsigned char *ADDR = (unsigned char *)addr;

 	ADDR += nr >> 3;
 	*ADDR |= 1 << (nr & 0x07);
 }

 static inline void __clear_le_bit(int nr, unsigned long *addr)
 {
 	unsigned char *ADDR = (unsigned char *)addr;

 	ADDR += nr >> 3;
 	*ADDR &= ~(1 << (nr & 0x07));
 }

 static inline int __test_and_set_le_bit(int nr, unsigned long *addr)
 {
 	int mask, retval;
 	unsigned char *ADDR = (unsigned char *)addr;

 	ADDR += nr >> 3;
 	mask = 1 << (nr & 0x07);
 	retval = (mask & *ADDR) != 0;
 	*ADDR |= mask;
 	return retval;
 }

 static inline int __test_and_clear_le_bit(int nr, unsigned long *addr)
 {
 	int mask, retval;
 	unsigned char *ADDR = (unsigned char *)addr;

 	ADDR += nr >> 3;
 	mask = 1 << (nr & 0x07);
 	retval = (mask & *ADDR) != 0;
 	*ADDR &= ~mask;
 	return retval;
 }

 static inline unsigned long find_next_zero_le_bit(const unsigned long *addr,
     unsigned long size, unsigned long offset)
 {
 	const unsigned long *p = addr + (offset >> 5);
 	unsigned long result = offset & ~31UL;
 	unsigned long tmp;

 	if (offset >= size)
 		return size;
 	size -= result;
 	offset &= 31UL;
 	if(offset) {
 		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 = __swab32(tmp) | (~0UL << size);
 	if (tmp == ~0UL)        /* Are any bits zero? */
 		return result + size; /* Nope. */
 	return result + ffz(tmp);

 found_middle:
 	return result + ffz(__swab32(tmp));
 }

 #define find_first_zero_le_bit(addr, size) \
         find_next_zero_le_bit((addr), (size), 0)

 #define ext2_set_bit(nr,addr)	\
 	__test_and_set_le_bit((nr),(unsigned long *)(addr))
 #define ext2_clear_bit(nr,addr)	\
 	__test_and_clear_le_bit((nr),(unsigned long *)(addr))

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

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

 #define ext2_test_bit(nr,addr)	\
 	test_le_bit((nr),(unsigned long *)(addr))
 #define ext2_find_first_zero_bit(addr, size) \
 	find_first_zero_le_bit((unsigned long *)(addr), (size))
 #define ext2_find_next_zero_bit(addr, size, off) \
 	find_next_zero_le_bit((unsigned long *)(addr), (size), (off))

 /* Bitmap functions for the minix filesystem.  */
 #define minix_test_and_set_bit(nr,addr)	\
 	test_and_set_bit((nr),(unsigned long *)(addr))
 #define minix_set_bit(nr,addr)		\
 	set_bit((nr),(unsigned long *)(addr))
 #define minix_test_and_clear_bit(nr,addr) \
 	test_and_clear_bit((nr),(unsigned long *)(addr))
 #define minix_test_bit(nr,addr)		\
 	test_bit((nr),(unsigned long *)(addr))
 #define minix_find_first_zero_bit(addr,size) \
 	find_first_zero_bit((unsigned long *)(addr),(size))

 #endif /* __KERNEL__ */

 #endif /* defined(_SPARC_BITOPS_H) */
	/* $Id: bitops.h,v 1.67 2001/11/19 18:36:34 davem Exp $
	* bitops.h: Bit string operations on the Sparc.
	*
	* Copyright 1995 David S. Miller (davem@caip.rutgers.edu)
	* Copyright 1996 Eddie C. Dost (ecd@skynet.be)
	* Copyright 2001 Anton Blanchard (anton@samba.org)
	*/

	#ifndef _SPARC_BITOPS_H
	#define _SPARC_BITOPS_H

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

	#ifdef __KERNEL__

	/*
	* Set bit 'nr' in 32-bit quantity at address 'addr' where bit '0'
	* is in the highest of the four bytes and bit '31' is the high bit
	* within the first byte. Sparc is BIG-Endian. Unless noted otherwise
	* all bit-ops return 0 if bit was previously clear and != 0 otherwise.
	*/
	static inline int test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
	{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov %%o7, %%g4\n\t"
	"call ___set_bit\n\t"
	" add %%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");

	return mask != 0;
	}

	static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
	{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov %%o7, %%g4\n\t"
	"call ___set_bit\n\t"
	" add %%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");
	}

	static inline int test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
	{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov %%o7, %%g4\n\t"
	"call ___clear_bit\n\t"
	" add %%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");

	return mask != 0;
	}

	static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
	{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov %%o7, %%g4\n\t"
	"call ___clear_bit\n\t"
	" add %%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");
	}

	static inline int test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
	{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov %%o7, %%g4\n\t"
	"call ___change_bit\n\t"
	" add %%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");

	return mask != 0;
	}

	static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
	{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov %%o7, %%g4\n\t"
	"call ___change_bit\n\t"
	" add %%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");
	}

	/*
	* non-atomic versions
	*/
	static inline void __set_bit(int nr, volatile unsigned long *addr)
	{
	unsigned long mask = 1UL << (nr & 0x1f);
	unsigned long p = ((unsigned long )addr) + (nr >> 5);

	*p \|= mask;
	}

	static inline void __clear_bit(int nr, volatile unsigned long *addr)
	{
	unsigned long mask = 1UL << (nr & 0x1f);
	unsigned long p = ((unsigned long )addr) + (nr >> 5);

	*p &= ~mask;
	}

	static inline void __change_bit(int nr, volatile unsigned long *addr)
	{
	unsigned long mask = 1UL << (nr & 0x1f);
	unsigned long p = ((unsigned long )addr) + (nr >> 5);

	*p ^= mask;
	}

	static inline int __test_and_set_bit(int nr, volatile unsigned long *addr)
	{
	unsigned long mask = 1UL << (nr & 0x1f);
	unsigned long p = ((unsigned long )addr) + (nr >> 5);
	unsigned long old = *p;

	*p = old \| mask;
	return (old & mask) != 0;
	}

	static inline int __test_and_clear_bit(int nr, volatile unsigned long *addr)
	{
	unsigned long mask = 1UL << (nr & 0x1f);
	unsigned long p = ((unsigned long )addr) + (nr >> 5);
	unsigned long old = *p;

	*p = old & ~mask;
	return (old & mask) != 0;
	}

	static inline int __test_and_change_bit(int nr, volatile unsigned long *addr)
	{
	unsigned long mask = 1UL << (nr & 0x1f);
	unsigned long p = ((unsigned long )addr) + (nr >> 5);
	unsigned long old = *p;

	*p = old ^ mask;
	return (old & mask) != 0;
	}

	#define smp_mb__before_clear_bit() do { } while(0)
	#define smp_mb__after_clear_bit() do { } while(0)

	/* The following routine need not be atomic. */
	static inline int test_bit(int nr, __const__ volatile unsigned long *addr)
	{
	return (1UL & (((unsigned long *)addr)[nr >> 5] >> (nr & 31))) != 0UL;
	}

	/* The easy/cheese version for now. */
	static inline unsigned long ffz(unsigned long word)
	{
	unsigned long result = 0;

	while(word & 1) {
	result++;
	word >>= 1;
	}
	return result;
	}

	/**
	* __ffs - find first bit in word.
	* @word: The word to search
	*
	* Undefined if no bit exists, so code should check against 0 first.
	*/
	static inline int __ffs(unsigned long word)
	{
	int num = 0;

	if ((word & 0xffff) == 0) {
	num += 16;
	word >>= 16;
	}
	if ((word & 0xff) == 0) {
	num += 8;
	word >>= 8;
	}
	if ((word & 0xf) == 0) {
	num += 4;
	word >>= 4;
	}
	if ((word & 0x3) == 0) {
	num += 2;
	word >>= 2;
	}
	if ((word & 0x1) == 0)
	num += 1;
	return num;
	}

	/*
	* Every architecture must define this function. It's the fastest
	* way of searching a 140-bit bitmap where the first 100 bits are
	* unlikely to be set. It's guaranteed that at least one of the 140
	* bits is cleared.
	*/
	static inline int sched_find_first_bit(unsigned long *b)
	{

	if (unlikely(b[0]))
	return __ffs(b[0]);
	if (unlikely(b[1]))
	return __ffs(b[1]) + 32;
	if (unlikely(b[2]))
	return __ffs(b[2]) + 64;
	if (b[3])
	return __ffs(b[3]) + 96;
	return __ffs(b[4]) + 128;
	}

	/*
	* 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)
	{
	if (!x)
	return 0;
	return __ffs((unsigned long)x) + 1;
	}

	/*
	* fls: find last (most-significant) bit set.
	* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
	*/
	#define fls(x) generic_fls(x)

	/*
	* hweightN: returns the hamming weight (i.e. the number
	* of bits set) of a N-bit word
	*/
	#define hweight32(x) generic_hweight32(x)
	#define hweight16(x) generic_hweight16(x)
	#define hweight8(x) generic_hweight8(x)

	/*
	* find_next_zero_bit() finds the first zero bit in a bit string of length
	* 'size' bits, starting the search at bit 'offset'. This is largely based
	* on Linus's ALPHA routines, which are pretty portable BTW.
	*/
	static inline unsigned long find_next_zero_bit(const unsigned long *addr,
	unsigned long size, unsigned long offset)
	{
	const unsigned long *p = addr + (offset >> 5);
	unsigned long result = offset & ~31UL;
	unsigned long tmp;

	if (offset >= size)
	return size;
	size -= result;
	offset &= 31UL;
	if (offset) {
	tmp = *(p++);
	tmp \|= ~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 \|= ~0UL << size;
	if (tmp == ~0UL) /* Are any bits zero? */
	return result + size; /* Nope. */
	found_middle:
	return result + ffz(tmp);
	}

	/*
	* Linus sez that gcc can optimize the following correctly, we'll see if this
	* holds on the Sparc as it does for the ALPHA.
	*/
	#define find_first_zero_bit(addr, size) \
	find_next_zero_bit((addr), (size), 0)

	/**
	* find_next_bit - find the first set bit in a memory region
	* @addr: The address to base the search on
	* @offset: The bitnumber to start searching at
	* @size: The maximum size to search
	*
	* Scheduler induced bitop, do not use.
	*/
	static inline int find_next_bit(const unsigned long *addr, int size, int offset)
	{
	const unsigned long *p = addr + (offset >> 5);
	int num = offset & ~0x1f;
	unsigned long word;

	word = *p++;
	word &= ~((1 << (offset & 0x1f)) - 1);
	while (num < size) {
	if (word != 0) {
	return __ffs(word) + num;
	}
	word = *p++;
	num += 0x20;
	}
	return num;
	}

	/**
	* find_first_bit - find the first set bit in a memory region
	* @addr: The address to start the search at
	* @size: The maximum size to search
	*
	* Returns the bit-number of the first set bit, not the number of the byte
	* containing a bit.
	*/
	#define find_first_bit(addr, size) \
	find_next_bit((addr), (size), 0)

	/*
	*/
	static inline int test_le_bit(int nr, __const__ unsigned long * addr)
	{
	__const__ unsigned char ADDR = (__const__ unsigned char ) addr;
	return (ADDR[nr >> 3] >> (nr & 7)) & 1;
	}

	/*
	* non-atomic versions
	*/
	static inline void __set_le_bit(int nr, unsigned long *addr)
	{
	unsigned char ADDR = (unsigned char )addr;

	ADDR += nr >> 3;
	*ADDR \|= 1 << (nr & 0x07);
	}

	static inline void __clear_le_bit(int nr, unsigned long *addr)
	{
	unsigned char ADDR = (unsigned char )addr;

	ADDR += nr >> 3;
	*ADDR &= ~(1 << (nr & 0x07));
	}

	static inline int __test_and_set_le_bit(int nr, unsigned long *addr)
	{
	int mask, retval;
	unsigned char ADDR = (unsigned char )addr;

	ADDR += nr >> 3;
	mask = 1 << (nr & 0x07);
	retval = (mask & *ADDR) != 0;
	*ADDR \|= mask;
	return retval;
	}

	static inline int __test_and_clear_le_bit(int nr, unsigned long *addr)
	{
	int mask, retval;
	unsigned char ADDR = (unsigned char )addr;

	ADDR += nr >> 3;
	mask = 1 << (nr & 0x07);
	retval = (mask & *ADDR) != 0;
	*ADDR &= ~mask;
	return retval;
	}

	static inline unsigned long find_next_zero_le_bit(const unsigned long *addr,
	unsigned long size, unsigned long offset)
	{
	const unsigned long *p = addr + (offset >> 5);
	unsigned long result = offset & ~31UL;
	unsigned long tmp;

	if (offset >= size)
	return size;
	size -= result;
	offset &= 31UL;
	if(offset) {
	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 = __swab32(tmp) \| (~0UL << size);
	if (tmp == ~0UL) /* Are any bits zero? */
	return result + size; /* Nope. */
	return result + ffz(tmp);

	found_middle:
	return result + ffz(__swab32(tmp));
	}

	#define find_first_zero_le_bit(addr, size) \
	find_next_zero_le_bit((addr), (size), 0)

	#define ext2_set_bit(nr,addr) \
	__test_and_set_le_bit((nr),(unsigned long *)(addr))
	#define ext2_clear_bit(nr,addr) \
	__test_and_clear_le_bit((nr),(unsigned long *)(addr))

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

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

	#define ext2_test_bit(nr,addr) \
	test_le_bit((nr),(unsigned long *)(addr))
	#define ext2_find_first_zero_bit(addr, size) \
	find_first_zero_le_bit((unsigned long *)(addr), (size))
	#define ext2_find_next_zero_bit(addr, size, off) \
	find_next_zero_le_bit((unsigned long *)(addr), (size), (off))

	/* Bitmap functions for the minix filesystem. */
	#define minix_test_and_set_bit(nr,addr) \
	test_and_set_bit((nr),(unsigned long *)(addr))
	#define minix_set_bit(nr,addr) \
	set_bit((nr),(unsigned long *)(addr))
	#define minix_test_and_clear_bit(nr,addr) \
	test_and_clear_bit((nr),(unsigned long *)(addr))
	#define minix_test_bit(nr,addr) \
	test_bit((nr),(unsigned long *)(addr))
	#define minix_find_first_zero_bit(addr,size) \
	find_first_zero_bit((unsigned long *)(addr),(size))

	#endif /* __KERNEL__ */

	#endif /* defined(_SPARC_BITOPS_H) */