include/asm-mips/bitops.h - kernel/msm - Gitiles

 /*
  * 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.
  *
  * Copyright (c) 1994 - 1997, 1999, 2000  Ralf Baechle (ralf@gnu.org)
  * Copyright (c) 1999, 2000  Silicon Graphics, Inc.
  */
 #ifndef _ASM_BITOPS_H
 #define _ASM_BITOPS_H

 #include <linux/config.h>
 #include <linux/compiler.h>
 #include <linux/types.h>
 #include <asm/byteorder.h>		/* sigh ... */
 #include <asm/cpu-features.h>

 #if (_MIPS_SZLONG == 32)
 #define SZLONG_LOG 5
 #define SZLONG_MASK 31UL
 #define __LL	"ll	"
 #define __SC	"sc	"
 #define cpu_to_lelongp(x) cpu_to_le32p((__u32 *) (x))
 #elif (_MIPS_SZLONG == 64)
 #define SZLONG_LOG 6
 #define SZLONG_MASK 63UL
 #define __LL	"lld	"
 #define __SC	"scd	"
 #define cpu_to_lelongp(x) cpu_to_le64p((__u64 *) (x))
 #endif

 #ifdef __KERNEL__

 #include <asm/interrupt.h>
 #include <asm/sgidefs.h>
 #include <asm/war.h>

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

 /*
  * Only disable interrupt for kernel mode stuff to keep usermode stuff
  * that dares to use kernel include files alive.
  */

 #define __bi_flags			unsigned long flags
 #define __bi_local_irq_save(x)		local_irq_save(x)
 #define __bi_local_irq_restore(x)	local_irq_restore(x)
 #else
 #define __bi_flags
 #define __bi_local_irq_save(x)
 #define __bi_local_irq_restore(x)
 #endif /* __KERNEL__ */

 /*
  * set_bit - Atomically set a bit in memory
  * @nr: the bit to set
  * @addr: the address to start counting from
  *
  * This function is atomic and may not be reordered.  See __set_bit()
  * if you do not require the atomic guarantees.
  * Note that @nr may be almost arbitrarily large; this function is not
  * restricted to acting on a single-word quantity.
  */
 static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
 	unsigned long temp;

 	if (cpu_has_llsc && R10000_LLSC_WAR) {
 		__asm__ __volatile__(
 		"1:	" __LL "%0, %1			# set_bit	\n"
 		"	or	%0, %2					\n"
 		"	"__SC	"%0, %1					\n"
 		"	beqzl	%0, 1b					\n"
 		: "=&r" (temp), "=m" (*m)
 		: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
 	} else if (cpu_has_llsc) {
 		__asm__ __volatile__(
 		"1:	" __LL "%0, %1			# set_bit	\n"
 		"	or	%0, %2					\n"
 		"	"__SC	"%0, %1					\n"
 		"	beqz	%0, 1b					\n"
 		: "=&r" (temp), "=m" (*m)
 		: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
 	} else {
 		volatile unsigned long *a = addr;
 		unsigned long mask;
 		__bi_flags;

 		a += nr >> SZLONG_LOG;
 		mask = 1UL << (nr & SZLONG_MASK);
 		__bi_local_irq_save(flags);
 		*a |= mask;
 		__bi_local_irq_restore(flags);
 	}
 }

 /*
  * __set_bit - Set a bit in memory
  * @nr: the bit to set
  * @addr: the address to start counting from
  *
  * Unlike set_bit(), this function is non-atomic and may be reordered.
  * If it's called on the same region of memory simultaneously, the effect
  * may be that only one operation succeeds.
  */
 static inline void __set_bit(unsigned long nr, volatile unsigned long * addr)
 {
 	unsigned long * m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);

 	*m |= 1UL << (nr & SZLONG_MASK);
 }

 /*
  * clear_bit - Clears a bit in memory
  * @nr: Bit to clear
  * @addr: Address to start counting from
  *
  * clear_bit() is atomic and may not be reordered.  However, it does
  * not contain a memory barrier, so if it is used for locking purposes,
  * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
  * in order to ensure changes are visible on other processors.
  */
 static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
 	unsigned long temp;

 	if (cpu_has_llsc && R10000_LLSC_WAR) {
 		__asm__ __volatile__(
 		"1:	" __LL "%0, %1			# clear_bit	\n"
 		"	and	%0, %2					\n"
 		"	" __SC "%0, %1					\n"
 		"	beqzl	%0, 1b					\n"
 		: "=&r" (temp), "=m" (*m)
 		: "ir" (~(1UL << (nr & SZLONG_MASK))), "m" (*m));
 	} else if (cpu_has_llsc) {
 		__asm__ __volatile__(
 		"1:	" __LL "%0, %1			# clear_bit	\n"
 		"	and	%0, %2					\n"
 		"	" __SC "%0, %1					\n"
 		"	beqz	%0, 1b					\n"
 		: "=&r" (temp), "=m" (*m)
 		: "ir" (~(1UL << (nr & SZLONG_MASK))), "m" (*m));
 	} else {
 		volatile unsigned long *a = addr;
 		unsigned long mask;
 		__bi_flags;

 		a += nr >> SZLONG_LOG;
 		mask = 1UL << (nr & SZLONG_MASK);
 		__bi_local_irq_save(flags);
 		*a &= ~mask;
 		__bi_local_irq_restore(flags);
 	}
 }

 /*
  * __clear_bit - Clears a bit in memory
  * @nr: Bit to clear
  * @addr: Address to start counting from
  *
  * Unlike clear_bit(), this function is non-atomic and may be reordered.
  * If it's called on the same region of memory simultaneously, the effect
  * may be that only one operation succeeds.
  */
 static inline void __clear_bit(unsigned long nr, volatile unsigned long * addr)
 {
 	unsigned long * m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);

 	*m &= ~(1UL << (nr & SZLONG_MASK));
 }

 /*
  * change_bit - Toggle a bit in memory
  * @nr: Bit to change
  * @addr: Address to start counting from
  *
  * change_bit() is atomic and may not be reordered.
  * Note that @nr may be almost arbitrarily large; this function is not
  * restricted to acting on a single-word quantity.
  */
 static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	if (cpu_has_llsc && R10000_LLSC_WAR) {
 		unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
 		unsigned long temp;

 		__asm__ __volatile__(
 		"1:	" __LL "%0, %1		# change_bit	\n"
 		"	xor	%0, %2				\n"
 		"	"__SC	"%0, %1				\n"
 		"	beqzl	%0, 1b				\n"
 		: "=&r" (temp), "=m" (*m)
 		: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
 	} else if (cpu_has_llsc) {
 		unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
 		unsigned long temp;

 		__asm__ __volatile__(
 		"1:	" __LL "%0, %1		# change_bit	\n"
 		"	xor	%0, %2				\n"
 		"	"__SC	"%0, %1				\n"
 		"	beqz	%0, 1b				\n"
 		: "=&r" (temp), "=m" (*m)
 		: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
 	} else {
 		volatile unsigned long *a = addr;
 		unsigned long mask;
 		__bi_flags;

 		a += nr >> SZLONG_LOG;
 		mask = 1UL << (nr & SZLONG_MASK);
 		__bi_local_irq_save(flags);
 		*a ^= mask;
 		__bi_local_irq_restore(flags);
 	}
 }

 /*
  * __change_bit - Toggle a bit in memory
  * @nr: the bit to change
  * @addr: the address to start counting from
  *
  * Unlike change_bit(), this function is non-atomic and may be reordered.
  * If it's called on the same region of memory simultaneously, the effect
  * may be that only one operation succeeds.
  */
 static inline void __change_bit(unsigned long nr, volatile unsigned long * addr)
 {
 	unsigned long * m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);

 	*m ^= 1UL << (nr & SZLONG_MASK);
 }

 /*
  * test_and_set_bit - Set a bit and return its old value
  * @nr: Bit to set
  * @addr: Address to count from
  *
  * This operation is atomic and cannot be reordered.
  * It also implies a memory barrier.
  */
 static inline int test_and_set_bit(unsigned long nr,
 	volatile unsigned long *addr)
 {
 	if (cpu_has_llsc && R10000_LLSC_WAR) {
 		unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
 		unsigned long temp, res;

 		__asm__ __volatile__(
 		"1:	" __LL "%0, %1		# test_and_set_bit	\n"
 		"	or	%2, %0, %3				\n"
 		"	" __SC	"%2, %1					\n"
 		"	beqzl	%2, 1b					\n"
 		"	and	%2, %0, %3				\n"
 #ifdef CONFIG_SMP
 		"sync							\n"
 #endif
 		: "=&r" (temp), "=m" (*m), "=&r" (res)
 		: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
 		: "memory");

 		return res != 0;
 	} else if (cpu_has_llsc) {
 		unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
 		unsigned long temp, res;

 		__asm__ __volatile__(
 		"	.set	noreorder	# test_and_set_bit	\n"
 		"1:	" __LL "%0, %1					\n"
 		"	or	%2, %0, %3				\n"
 		"	" __SC	"%2, %1					\n"
 		"	beqz	%2, 1b					\n"
 		"	 and	%2, %0, %3				\n"
 #ifdef CONFIG_SMP
 		"sync							\n"
 #endif
 		".set\treorder"
 		: "=&r" (temp), "=m" (*m), "=&r" (res)
 		: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
 		: "memory");

 		return res != 0;
 	} else {
 		volatile unsigned long *a = addr;
 		unsigned long mask;
 		int retval;
 		__bi_flags;

 		a += nr >> SZLONG_LOG;
 		mask = 1UL << (nr & SZLONG_MASK);
 		__bi_local_irq_save(flags);
 		retval = (mask & *a) != 0;
 		*a |= mask;
 		__bi_local_irq_restore(flags);

 		return retval;
 	}
 }

 /*
  * __test_and_set_bit - Set a bit and return its old value
  * @nr: Bit to set
  * @addr: Address to count from
  *
  * This operation is non-atomic and can be reordered.
  * If two examples of this operation race, one can appear to succeed
  * but actually fail.  You must protect multiple accesses with a lock.
  */
 static inline int __test_and_set_bit(unsigned long nr,
 	volatile unsigned long *addr)
 {
 	volatile unsigned long *a = addr;
 	unsigned long mask;
 	int retval;

 	a += nr >> SZLONG_LOG;
 	mask = 1UL << (nr & SZLONG_MASK);
 	retval = (mask & *a) != 0;
 	*a |= mask;

 	return retval;
 }

 /*
  * test_and_clear_bit - Clear a bit and return its old value
  * @nr: Bit to clear
  * @addr: Address to count from
  *
  * This operation is atomic and cannot be reordered.
  * It also implies a memory barrier.
  */
 static inline int test_and_clear_bit(unsigned long nr,
 	volatile unsigned long *addr)
 {
 	if (cpu_has_llsc && R10000_LLSC_WAR) {
 		unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
 		unsigned long temp, res;

 		__asm__ __volatile__(
 		"1:	" __LL	"%0, %1		# test_and_clear_bit	\n"
 		"	or	%2, %0, %3				\n"
 		"	xor	%2, %3					\n"
 			__SC 	"%2, %1					\n"
 		"	beqzl	%2, 1b					\n"
 		"	and	%2, %0, %3				\n"
 #ifdef CONFIG_SMP
 		"	sync						\n"
 #endif
 		: "=&r" (temp), "=m" (*m), "=&r" (res)
 		: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
 		: "memory");

 		return res != 0;
 	} else if (cpu_has_llsc) {
 		unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
 		unsigned long temp, res;

 		__asm__ __volatile__(
 		"	.set	noreorder	# test_and_clear_bit	\n"
 		"1:	" __LL	"%0, %1					\n"
 		"	or	%2, %0, %3				\n"
 		"	xor	%2, %3					\n"
 			__SC 	"%2, %1					\n"
 		"	beqz	%2, 1b					\n"
 		"	 and	%2, %0, %3				\n"
 #ifdef CONFIG_SMP
 		"	sync						\n"
 #endif
 		"	.set	reorder					\n"
 		: "=&r" (temp), "=m" (*m), "=&r" (res)
 		: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
 		: "memory");

 		return res != 0;
 	} else {
 		volatile unsigned long *a = addr;
 		unsigned long mask;
 		int retval;
 		__bi_flags;

 		a += nr >> SZLONG_LOG;
 		mask = 1UL << (nr & SZLONG_MASK);
 		__bi_local_irq_save(flags);
 		retval = (mask & *a) != 0;
 		*a &= ~mask;
 		__bi_local_irq_restore(flags);

 		return retval;
 	}
 }

 /*
  * __test_and_clear_bit - Clear a bit and return its old value
  * @nr: Bit to clear
  * @addr: Address to count from
  *
  * This operation is non-atomic and can be reordered.
  * If two examples of this operation race, one can appear to succeed
  * but actually fail.  You must protect multiple accesses with a lock.
  */
 static inline int __test_and_clear_bit(unsigned long nr,
 	volatile unsigned long * addr)
 {
 	volatile unsigned long *a = addr;
 	unsigned long mask;
 	int retval;

 	a += (nr >> SZLONG_LOG);
 	mask = 1UL << (nr & SZLONG_MASK);
 	retval = ((mask & *a) != 0);
 	*a &= ~mask;

 	return retval;
 }

 /*
  * test_and_change_bit - Change a bit and return its old value
  * @nr: Bit to change
  * @addr: Address to count from
  *
  * This operation is atomic and cannot be reordered.
  * It also implies a memory barrier.
  */
 static inline int test_and_change_bit(unsigned long nr,
 	volatile unsigned long *addr)
 {
 	if (cpu_has_llsc && R10000_LLSC_WAR) {
 		unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
 		unsigned long temp, res;

 		__asm__ __volatile__(
 		"1:	" __LL	" %0, %1	# test_and_change_bit	\n"
 		"	xor	%2, %0, %3				\n"
 		"	"__SC	"%2, %1					\n"
 		"	beqzl	%2, 1b					\n"
 		"	and	%2, %0, %3				\n"
 #ifdef CONFIG_SMP
 		"	sync						\n"
 #endif
 		: "=&r" (temp), "=m" (*m), "=&r" (res)
 		: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
 		: "memory");

 		return res != 0;
 	} else if (cpu_has_llsc) {
 		unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
 		unsigned long temp, res;

 		__asm__ __volatile__(
 		"	.set	noreorder	# test_and_change_bit	\n"
 		"1:	" __LL	" %0, %1				\n"
 		"	xor	%2, %0, %3				\n"
 		"	"__SC	"\t%2, %1				\n"
 		"	beqz	%2, 1b					\n"
 		"	 and	%2, %0, %3				\n"
 #ifdef CONFIG_SMP
 		"	sync						\n"
 #endif
 		"	.set	reorder					\n"
 		: "=&r" (temp), "=m" (*m), "=&r" (res)
 		: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
 		: "memory");

 		return res != 0;
 	} else {
 		volatile unsigned long *a = addr;
 		unsigned long mask, retval;
 		__bi_flags;

 		a += nr >> SZLONG_LOG;
 		mask = 1UL << (nr & SZLONG_MASK);
 		__bi_local_irq_save(flags);
 		retval = (mask & *a) != 0;
 		*a ^= mask;
 		__bi_local_irq_restore(flags);

 		return retval;
 	}
 }

 /*
  * __test_and_change_bit - Change a bit and return its old value
  * @nr: Bit to change
  * @addr: Address to count from
  *
  * This operation is non-atomic and can be reordered.
  * If two examples of this operation race, one can appear to succeed
  * but actually fail.  You must protect multiple accesses with a lock.
  */
 static inline int __test_and_change_bit(unsigned long nr,
 	volatile unsigned long *addr)
 {
 	volatile unsigned long *a = addr;
 	unsigned long mask;
 	int retval;

 	a += (nr >> SZLONG_LOG);
 	mask = 1UL << (nr & SZLONG_MASK);
 	retval = ((mask & *a) != 0);
 	*a ^= mask;

 	return retval;
 }

 #undef __bi_flags
 #undef __bi_local_irq_save
 #undef __bi_local_irq_restore

 /*
  * test_bit - Determine whether a bit is set
  * @nr: bit number to test
  * @addr: Address to start counting from
  */
 static inline int test_bit(unsigned long nr, const volatile unsigned long *addr)
 {
 	return 1UL & (addr[nr >> SZLONG_LOG] >> (nr & SZLONG_MASK));
 }

 /*
  * ffz - find first zero in word.
  * @word: The word to search
  *
  * Undefined if no zero exists, so code should check against ~0UL first.
  */
 static inline unsigned long ffz(unsigned long word)
 {
 	int b = 0, s;

 	word = ~word;
 #ifdef CONFIG_32BIT
 	s = 16; if (word << 16 != 0) s = 0; b += s; word >>= s;
 	s =  8; if (word << 24 != 0) s = 0; b += s; word >>= s;
 	s =  4; if (word << 28 != 0) s = 0; b += s; word >>= s;
 	s =  2; if (word << 30 != 0) s = 0; b += s; word >>= s;
 	s =  1; if (word << 31 != 0) s = 0; b += s;
 #endif
 #ifdef CONFIG_64BIT
 	s = 32; if (word << 32 != 0) s = 0; b += s; word >>= s;
 	s = 16; if (word << 48 != 0) s = 0; b += s; word >>= s;
 	s =  8; if (word << 56 != 0) s = 0; b += s; word >>= s;
 	s =  4; if (word << 60 != 0) s = 0; b += s; word >>= s;
 	s =  2; if (word << 62 != 0) s = 0; b += s; word >>= s;
 	s =  1; if (word << 63 != 0) s = 0; b += s;
 #endif

 	return b;
 }

 /*
  * __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 unsigned long __ffs(unsigned long word)
 {
 	return ffz(~word);
 }

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

 #define fls(x) generic_fls(x)

 /*
  * find_next_zero_bit - find the first zero 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
  */
 static inline unsigned long find_next_zero_bit(const unsigned long *addr,
 	unsigned long size, unsigned long offset)
 {
 	const unsigned long *p = addr + (offset >> SZLONG_LOG);
 	unsigned long result = offset & ~SZLONG_MASK;
 	unsigned long tmp;

 	if (offset >= size)
 		return size;
 	size -= result;
 	offset &= SZLONG_MASK;
 	if (offset) {
 		tmp = *(p++);
 		tmp |= ~0UL >> (_MIPS_SZLONG-offset);
 		if (size < _MIPS_SZLONG)
 			goto found_first;
 		if (~tmp)
 			goto found_middle;
 		size -= _MIPS_SZLONG;
 		result += _MIPS_SZLONG;
 	}
 	while (size & ~SZLONG_MASK) {
 		if (~(tmp = *(p++)))
 			goto found_middle;
 		result += _MIPS_SZLONG;
 		size -= _MIPS_SZLONG;
 	}
 	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);
 }

 #define find_first_zero_bit(addr, size) \
 	find_next_zero_bit((addr), (size), 0)

 /*
  * find_next_bit - find the next 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
  */
 static inline unsigned long find_next_bit(const unsigned long *addr,
 	unsigned long size, unsigned long offset)
 {
 	const unsigned long *p = addr + (offset >> SZLONG_LOG);
 	unsigned long result = offset & ~SZLONG_MASK;
 	unsigned long tmp;

 	if (offset >= size)
 		return size;
 	size -= result;
 	offset &= SZLONG_MASK;
 	if (offset) {
 		tmp = *(p++);
 		tmp &= ~0UL << offset;
 		if (size < _MIPS_SZLONG)
 			goto found_first;
 		if (tmp)
 			goto found_middle;
 		size -= _MIPS_SZLONG;
 		result += _MIPS_SZLONG;
 	}
 	while (size & ~SZLONG_MASK) {
 		if ((tmp = *(p++)))
 			goto found_middle;
 		result += _MIPS_SZLONG;
 		size -= _MIPS_SZLONG;
 	}
 	if (!size)
 		return result;
 	tmp = *p;

 found_first:
 	tmp &= ~0UL >> (_MIPS_SZLONG - size);
 	if (tmp == 0UL)			/* Are any bits set? */
 		return result + size;	/* Nope. */
 found_middle:
 	return result + __ffs(tmp);
 }

 /*
  * 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)

 #ifdef __KERNEL__

 /*
  * 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(const unsigned long *b)
 {
 #ifdef CONFIG_32BIT
 	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;
 #endif
 #ifdef CONFIG_64BIT
 	if (unlikely(b[0]))
 		return __ffs(b[0]);
 	if (unlikely(b[1]))
 		return __ffs(b[1]) + 64;
 	return __ffs(b[2]) + 128;
 #endif
 }

 /*
  * ffs - find first bit set
  * @x: the word to search
  *
  * This is defined the same way as
  * the libc and compiler builtin ffs routines, therefore
  * differs in spirit from the above ffz (man ffs).
  */

 #define ffs(x) generic_ffs(x)

 /*
  * hweightN - returns the hamming weight of a N-bit word
  * @x: the word to weigh
  *
  * The Hamming Weight of a number is the total number of bits set in it.
  */

 #define hweight64(x)	generic_hweight64(x)
 #define hweight32(x)	generic_hweight32(x)
 #define hweight16(x)	generic_hweight16(x)
 #define hweight8(x)	generic_hweight8(x)

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

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

 	return retval;
 }

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

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

 	return retval;
 }

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

 	ADDR += nr >> 3;
 	mask = 1 << (nr & 0x07);

 	return ((mask & *ADDR) != 0);
 }

 static inline unsigned long find_next_zero_le_bit(unsigned long *addr,
 	unsigned long size, unsigned long offset)
 {
 	unsigned long *p = ((unsigned long *) addr) + (offset >> SZLONG_LOG);
 	unsigned long result = offset & ~SZLONG_MASK;
 	unsigned long tmp;

 	if (offset >= size)
 		return size;
 	size -= result;
 	offset &= SZLONG_MASK;
 	if (offset) {
 		tmp = cpu_to_lelongp(p++);
 		tmp |= ~0UL >> (_MIPS_SZLONG-offset); /* bug or feature ? */
 		if (size < _MIPS_SZLONG)
 			goto found_first;
 		if (~tmp)
 			goto found_middle;
 		size -= _MIPS_SZLONG;
 		result += _MIPS_SZLONG;
 	}
 	while (size & ~SZLONG_MASK) {
 		if (~(tmp = cpu_to_lelongp(p++)))
 			goto found_middle;
 		result += _MIPS_SZLONG;
 		size -= _MIPS_SZLONG;
 	}
 	if (!size)
 		return result;
 	tmp = cpu_to_lelongp(p);

 found_first:
 	tmp |= ~0UL << size;
 	if (tmp == ~0UL)		/* Are any bits zero? */
 		return result + size;	/* Nope. */

 found_middle:
 	return result + ffz(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), (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;						\
 })
 #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.
  *
  * FIXME: These assume that Minix uses the native byte/bitorder.
  * This limits the Minix filesystem's value for data exchange very much.
  */
 #define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
 #define minix_set_bit(nr,addr) set_bit(nr,addr)
 #define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
 #define minix_test_bit(nr,addr) test_bit(nr,addr)
 #define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)

 #endif /* __KERNEL__ */

 #endif /* _ASM_BITOPS_H */
	/*
	* 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.
	*
	* Copyright (c) 1994 - 1997, 1999, 2000 Ralf Baechle (ralf@gnu.org)
	* Copyright (c) 1999, 2000 Silicon Graphics, Inc.
	*/
	#ifndef _ASM_BITOPS_H
	#define _ASM_BITOPS_H

	#include <linux/config.h>
	#include <linux/compiler.h>
	#include <linux/types.h>
	#include <asm/byteorder.h> /* sigh ... */
	#include <asm/cpu-features.h>

	#if (_MIPS_SZLONG == 32)
	#define SZLONG_LOG 5
	#define SZLONG_MASK 31UL
	#define __LL "ll "
	#define __SC "sc "
	#define cpu_to_lelongp(x) cpu_to_le32p((__u32 *) (x))
	#elif (_MIPS_SZLONG == 64)
	#define SZLONG_LOG 6
	#define SZLONG_MASK 63UL
	#define __LL "lld "
	#define __SC "scd "
	#define cpu_to_lelongp(x) cpu_to_le64p((__u64 *) (x))
	#endif

	#ifdef __KERNEL__

	#include <asm/interrupt.h>
	#include <asm/sgidefs.h>
	#include <asm/war.h>

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

	/*
	* Only disable interrupt for kernel mode stuff to keep usermode stuff
	* that dares to use kernel include files alive.
	*/

	#define __bi_flags unsigned long flags
	#define __bi_local_irq_save(x) local_irq_save(x)
	#define __bi_local_irq_restore(x) local_irq_restore(x)
	#else
	#define __bi_flags
	#define __bi_local_irq_save(x)
	#define __bi_local_irq_restore(x)
	#endif /* __KERNEL__ */

	/*
	* set_bit - Atomically set a bit in memory
	* @nr: the bit to set
	* @addr: the address to start counting from
	*
	* This function is atomic and may not be reordered. See __set_bit()
	* if you do not require the atomic guarantees.
	* Note that @nr may be almost arbitrarily large; this function is not
	* restricted to acting on a single-word quantity.
	*/
	static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
	{
	unsigned long m = ((unsigned long ) addr) + (nr >> SZLONG_LOG);
	unsigned long temp;

	if (cpu_has_llsc && R10000_LLSC_WAR) {
	__asm__ __volatile__(
	"1: " __LL "%0, %1 # set_bit \n"
	" or %0, %2 \n"
	" "__SC "%0, %1 \n"
	" beqzl %0, 1b \n"
	: "=&r" (temp), "=m" (*m)
	: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
	} else if (cpu_has_llsc) {
	__asm__ __volatile__(
	"1: " __LL "%0, %1 # set_bit \n"
	" or %0, %2 \n"
	" "__SC "%0, %1 \n"
	" beqz %0, 1b \n"
	: "=&r" (temp), "=m" (*m)
	: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
	} else {
	volatile unsigned long *a = addr;
	unsigned long mask;
	__bi_flags;

	a += nr >> SZLONG_LOG;
	mask = 1UL << (nr & SZLONG_MASK);
	__bi_local_irq_save(flags);
	*a \|= mask;
	__bi_local_irq_restore(flags);
	}
	}

	/*
	* __set_bit - Set a bit in memory
	* @nr: the bit to set
	* @addr: the address to start counting from
	*
	* Unlike set_bit(), this function is non-atomic and may be reordered.
	* If it's called on the same region of memory simultaneously, the effect
	* may be that only one operation succeeds.
	*/
	static inline void __set_bit(unsigned long nr, volatile unsigned long * addr)
	{
	unsigned long * m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);

	*m \|= 1UL << (nr & SZLONG_MASK);
	}

	/*
	* clear_bit - Clears a bit in memory
	* @nr: Bit to clear
	* @addr: Address to start counting from
	*
	* clear_bit() is atomic and may not be reordered. However, it does
	* not contain a memory barrier, so if it is used for locking purposes,
	* you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
	* in order to ensure changes are visible on other processors.
	*/
	static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
	{
	unsigned long m = ((unsigned long ) addr) + (nr >> SZLONG_LOG);
	unsigned long temp;

	if (cpu_has_llsc && R10000_LLSC_WAR) {
	__asm__ __volatile__(
	"1: " __LL "%0, %1 # clear_bit \n"
	" and %0, %2 \n"
	" " __SC "%0, %1 \n"
	" beqzl %0, 1b \n"
	: "=&r" (temp), "=m" (*m)
	: "ir" (~(1UL << (nr & SZLONG_MASK))), "m" (*m));
	} else if (cpu_has_llsc) {
	__asm__ __volatile__(
	"1: " __LL "%0, %1 # clear_bit \n"
	" and %0, %2 \n"
	" " __SC "%0, %1 \n"
	" beqz %0, 1b \n"
	: "=&r" (temp), "=m" (*m)
	: "ir" (~(1UL << (nr & SZLONG_MASK))), "m" (*m));
	} else {
	volatile unsigned long *a = addr;
	unsigned long mask;
	__bi_flags;

	a += nr >> SZLONG_LOG;
	mask = 1UL << (nr & SZLONG_MASK);
	__bi_local_irq_save(flags);
	*a &= ~mask;
	__bi_local_irq_restore(flags);
	}
	}

	/*
	* __clear_bit - Clears a bit in memory
	* @nr: Bit to clear
	* @addr: Address to start counting from
	*
	* Unlike clear_bit(), this function is non-atomic and may be reordered.
	* If it's called on the same region of memory simultaneously, the effect
	* may be that only one operation succeeds.
	*/
	static inline void __clear_bit(unsigned long nr, volatile unsigned long * addr)
	{
	unsigned long * m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);

	*m &= ~(1UL << (nr & SZLONG_MASK));
	}

	/*
	* change_bit - Toggle a bit in memory
	* @nr: Bit to change
	* @addr: Address to start counting from
	*
	* change_bit() is atomic and may not be reordered.
	* Note that @nr may be almost arbitrarily large; this function is not
	* restricted to acting on a single-word quantity.
	*/
	static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
	{
	if (cpu_has_llsc && R10000_LLSC_WAR) {
	unsigned long m = ((unsigned long ) addr) + (nr >> SZLONG_LOG);
	unsigned long temp;

	__asm__ __volatile__(
	"1: " __LL "%0, %1 # change_bit \n"
	" xor %0, %2 \n"
	" "__SC "%0, %1 \n"
	" beqzl %0, 1b \n"
	: "=&r" (temp), "=m" (*m)
	: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
	} else if (cpu_has_llsc) {
	unsigned long m = ((unsigned long ) addr) + (nr >> SZLONG_LOG);
	unsigned long temp;

	__asm__ __volatile__(
	"1: " __LL "%0, %1 # change_bit \n"
	" xor %0, %2 \n"
	" "__SC "%0, %1 \n"
	" beqz %0, 1b \n"
	: "=&r" (temp), "=m" (*m)
	: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
	} else {
	volatile unsigned long *a = addr;
	unsigned long mask;
	__bi_flags;

	a += nr >> SZLONG_LOG;
	mask = 1UL << (nr & SZLONG_MASK);
	__bi_local_irq_save(flags);
	*a ^= mask;
	__bi_local_irq_restore(flags);
	}
	}

	/*
	* __change_bit - Toggle a bit in memory
	* @nr: the bit to change
	* @addr: the address to start counting from
	*
	* Unlike change_bit(), this function is non-atomic and may be reordered.
	* If it's called on the same region of memory simultaneously, the effect
	* may be that only one operation succeeds.
	*/
	static inline void __change_bit(unsigned long nr, volatile unsigned long * addr)
	{
	unsigned long * m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);

	*m ^= 1UL << (nr & SZLONG_MASK);
	}

	/*
	* test_and_set_bit - Set a bit and return its old value
	* @nr: Bit to set
	* @addr: Address to count from
	*
	* This operation is atomic and cannot be reordered.
	* It also implies a memory barrier.
	*/
	static inline int test_and_set_bit(unsigned long nr,
	volatile unsigned long *addr)
	{
	if (cpu_has_llsc && R10000_LLSC_WAR) {
	unsigned long m = ((unsigned long ) addr) + (nr >> SZLONG_LOG);
	unsigned long temp, res;

	__asm__ __volatile__(
	"1: " __LL "%0, %1 # test_and_set_bit \n"
	" or %2, %0, %3 \n"
	" " __SC "%2, %1 \n"
	" beqzl %2, 1b \n"
	" and %2, %0, %3 \n"
	#ifdef CONFIG_SMP
	"sync \n"
	#endif
	: "=&r" (temp), "=m" (*m), "=&r" (res)
	: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
	: "memory");

	return res != 0;
	} else if (cpu_has_llsc) {
	unsigned long m = ((unsigned long ) addr) + (nr >> SZLONG_LOG);
	unsigned long temp, res;

	__asm__ __volatile__(
	" .set noreorder # test_and_set_bit \n"
	"1: " __LL "%0, %1 \n"
	" or %2, %0, %3 \n"
	" " __SC "%2, %1 \n"
	" beqz %2, 1b \n"
	" and %2, %0, %3 \n"
	#ifdef CONFIG_SMP
	"sync \n"
	#endif
	".set\treorder"
	: "=&r" (temp), "=m" (*m), "=&r" (res)
	: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
	: "memory");

	return res != 0;
	} else {
	volatile unsigned long *a = addr;
	unsigned long mask;
	int retval;
	__bi_flags;

	a += nr >> SZLONG_LOG;
	mask = 1UL << (nr & SZLONG_MASK);
	__bi_local_irq_save(flags);
	retval = (mask & *a) != 0;
	*a \|= mask;
	__bi_local_irq_restore(flags);

	return retval;
	}
	}

	/*
	* __test_and_set_bit - Set a bit and return its old value
	* @nr: Bit to set
	* @addr: Address to count from
	*
	* This operation is non-atomic and can be reordered.
	* If two examples of this operation race, one can appear to succeed
	* but actually fail. You must protect multiple accesses with a lock.
	*/
	static inline int __test_and_set_bit(unsigned long nr,
	volatile unsigned long *addr)
	{
	volatile unsigned long *a = addr;
	unsigned long mask;
	int retval;

	a += nr >> SZLONG_LOG;
	mask = 1UL << (nr & SZLONG_MASK);
	retval = (mask & *a) != 0;
	*a \|= mask;

	return retval;
	}

	/*
	* test_and_clear_bit - Clear a bit and return its old value
	* @nr: Bit to clear
	* @addr: Address to count from
	*
	* This operation is atomic and cannot be reordered.
	* It also implies a memory barrier.
	*/
	static inline int test_and_clear_bit(unsigned long nr,
	volatile unsigned long *addr)
	{
	if (cpu_has_llsc && R10000_LLSC_WAR) {
	unsigned long m = ((unsigned long ) addr) + (nr >> SZLONG_LOG);
	unsigned long temp, res;

	__asm__ __volatile__(
	"1: " __LL "%0, %1 # test_and_clear_bit \n"
	" or %2, %0, %3 \n"
	" xor %2, %3 \n"
	__SC "%2, %1 \n"
	" beqzl %2, 1b \n"
	" and %2, %0, %3 \n"
	#ifdef CONFIG_SMP
	" sync \n"
	#endif
	: "=&r" (temp), "=m" (*m), "=&r" (res)
	: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
	: "memory");

	return res != 0;
	} else if (cpu_has_llsc) {
	unsigned long m = ((unsigned long ) addr) + (nr >> SZLONG_LOG);
	unsigned long temp, res;

	__asm__ __volatile__(
	" .set noreorder # test_and_clear_bit \n"
	"1: " __LL "%0, %1 \n"
	" or %2, %0, %3 \n"
	" xor %2, %3 \n"
	__SC "%2, %1 \n"
	" beqz %2, 1b \n"
	" and %2, %0, %3 \n"
	#ifdef CONFIG_SMP
	" sync \n"
	#endif
	" .set reorder \n"
	: "=&r" (temp), "=m" (*m), "=&r" (res)
	: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
	: "memory");

	return res != 0;
	} else {
	volatile unsigned long *a = addr;
	unsigned long mask;
	int retval;
	__bi_flags;

	a += nr >> SZLONG_LOG;
	mask = 1UL << (nr & SZLONG_MASK);
	__bi_local_irq_save(flags);
	retval = (mask & *a) != 0;
	*a &= ~mask;
	__bi_local_irq_restore(flags);

	return retval;
	}
	}

	/*
	* __test_and_clear_bit - Clear a bit and return its old value
	* @nr: Bit to clear
	* @addr: Address to count from
	*
	* This operation is non-atomic and can be reordered.
	* If two examples of this operation race, one can appear to succeed
	* but actually fail. You must protect multiple accesses with a lock.
	*/
	static inline int __test_and_clear_bit(unsigned long nr,
	volatile unsigned long * addr)
	{
	volatile unsigned long *a = addr;
	unsigned long mask;
	int retval;

	a += (nr >> SZLONG_LOG);
	mask = 1UL << (nr & SZLONG_MASK);
	retval = ((mask & *a) != 0);
	*a &= ~mask;

	return retval;
	}

	/*
	* test_and_change_bit - Change a bit and return its old value
	* @nr: Bit to change
	* @addr: Address to count from
	*
	* This operation is atomic and cannot be reordered.
	* It also implies a memory barrier.
	*/
	static inline int test_and_change_bit(unsigned long nr,
	volatile unsigned long *addr)
	{
	if (cpu_has_llsc && R10000_LLSC_WAR) {
	unsigned long m = ((unsigned long ) addr) + (nr >> SZLONG_LOG);
	unsigned long temp, res;

	__asm__ __volatile__(
	"1: " __LL " %0, %1 # test_and_change_bit \n"
	" xor %2, %0, %3 \n"
	" "__SC "%2, %1 \n"
	" beqzl %2, 1b \n"
	" and %2, %0, %3 \n"
	#ifdef CONFIG_SMP
	" sync \n"
	#endif
	: "=&r" (temp), "=m" (*m), "=&r" (res)
	: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
	: "memory");

	return res != 0;
	} else if (cpu_has_llsc) {
	unsigned long m = ((unsigned long ) addr) + (nr >> SZLONG_LOG);
	unsigned long temp, res;

	__asm__ __volatile__(
	" .set noreorder # test_and_change_bit \n"
	"1: " __LL " %0, %1 \n"
	" xor %2, %0, %3 \n"
	" "__SC "\t%2, %1 \n"
	" beqz %2, 1b \n"
	" and %2, %0, %3 \n"
	#ifdef CONFIG_SMP
	" sync \n"
	#endif
	" .set reorder \n"
	: "=&r" (temp), "=m" (*m), "=&r" (res)
	: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
	: "memory");

	return res != 0;
	} else {
	volatile unsigned long *a = addr;
	unsigned long mask, retval;
	__bi_flags;

	a += nr >> SZLONG_LOG;
	mask = 1UL << (nr & SZLONG_MASK);
	__bi_local_irq_save(flags);
	retval = (mask & *a) != 0;
	*a ^= mask;
	__bi_local_irq_restore(flags);

	return retval;
	}
	}

	/*
	* __test_and_change_bit - Change a bit and return its old value
	* @nr: Bit to change
	* @addr: Address to count from
	*
	* This operation is non-atomic and can be reordered.
	* If two examples of this operation race, one can appear to succeed
	* but actually fail. You must protect multiple accesses with a lock.
	*/
	static inline int __test_and_change_bit(unsigned long nr,
	volatile unsigned long *addr)
	{
	volatile unsigned long *a = addr;
	unsigned long mask;
	int retval;

	a += (nr >> SZLONG_LOG);
	mask = 1UL << (nr & SZLONG_MASK);
	retval = ((mask & *a) != 0);
	*a ^= mask;

	return retval;
	}

	#undef __bi_flags
	#undef __bi_local_irq_save
	#undef __bi_local_irq_restore

	/*
	* test_bit - Determine whether a bit is set
	* @nr: bit number to test
	* @addr: Address to start counting from
	*/
	static inline int test_bit(unsigned long nr, const volatile unsigned long *addr)
	{
	return 1UL & (addr[nr >> SZLONG_LOG] >> (nr & SZLONG_MASK));
	}

	/*
	* ffz - find first zero in word.
	* @word: The word to search
	*
	* Undefined if no zero exists, so code should check against ~0UL first.
	*/
	static inline unsigned long ffz(unsigned long word)
	{
	int b = 0, s;

	word = ~word;
	#ifdef CONFIG_32BIT
	s = 16; if (word << 16 != 0) s = 0; b += s; word >>= s;
	s = 8; if (word << 24 != 0) s = 0; b += s; word >>= s;
	s = 4; if (word << 28 != 0) s = 0; b += s; word >>= s;
	s = 2; if (word << 30 != 0) s = 0; b += s; word >>= s;
	s = 1; if (word << 31 != 0) s = 0; b += s;
	#endif
	#ifdef CONFIG_64BIT
	s = 32; if (word << 32 != 0) s = 0; b += s; word >>= s;
	s = 16; if (word << 48 != 0) s = 0; b += s; word >>= s;
	s = 8; if (word << 56 != 0) s = 0; b += s; word >>= s;
	s = 4; if (word << 60 != 0) s = 0; b += s; word >>= s;
	s = 2; if (word << 62 != 0) s = 0; b += s; word >>= s;
	s = 1; if (word << 63 != 0) s = 0; b += s;
	#endif

	return b;
	}

	/*
	* __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 unsigned long __ffs(unsigned long word)
	{
	return ffz(~word);
	}

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

	#define fls(x) generic_fls(x)

	/*
	* find_next_zero_bit - find the first zero 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
	*/
	static inline unsigned long find_next_zero_bit(const unsigned long *addr,
	unsigned long size, unsigned long offset)
	{
	const unsigned long *p = addr + (offset >> SZLONG_LOG);
	unsigned long result = offset & ~SZLONG_MASK;
	unsigned long tmp;

	if (offset >= size)
	return size;
	size -= result;
	offset &= SZLONG_MASK;
	if (offset) {
	tmp = *(p++);
	tmp \|= ~0UL >> (_MIPS_SZLONG-offset);
	if (size < _MIPS_SZLONG)
	goto found_first;
	if (~tmp)
	goto found_middle;
	size -= _MIPS_SZLONG;
	result += _MIPS_SZLONG;
	}
	while (size & ~SZLONG_MASK) {
	if (~(tmp = *(p++)))
	goto found_middle;
	result += _MIPS_SZLONG;
	size -= _MIPS_SZLONG;
	}
	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);
	}

	#define find_first_zero_bit(addr, size) \
	find_next_zero_bit((addr), (size), 0)

	/*
	* find_next_bit - find the next 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
	*/
	static inline unsigned long find_next_bit(const unsigned long *addr,
	unsigned long size, unsigned long offset)
	{
	const unsigned long *p = addr + (offset >> SZLONG_LOG);
	unsigned long result = offset & ~SZLONG_MASK;
	unsigned long tmp;

	if (offset >= size)
	return size;
	size -= result;
	offset &= SZLONG_MASK;
	if (offset) {
	tmp = *(p++);
	tmp &= ~0UL << offset;
	if (size < _MIPS_SZLONG)
	goto found_first;
	if (tmp)
	goto found_middle;
	size -= _MIPS_SZLONG;
	result += _MIPS_SZLONG;
	}
	while (size & ~SZLONG_MASK) {
	if ((tmp = *(p++)))
	goto found_middle;
	result += _MIPS_SZLONG;
	size -= _MIPS_SZLONG;
	}
	if (!size)
	return result;
	tmp = *p;

	found_first:
	tmp &= ~0UL >> (_MIPS_SZLONG - size);
	if (tmp == 0UL) /* Are any bits set? */
	return result + size; /* Nope. */
	found_middle:
	return result + __ffs(tmp);
	}

	/*
	* 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)

	#ifdef __KERNEL__

	/*
	* 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(const unsigned long *b)
	{
	#ifdef CONFIG_32BIT
	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;
	#endif
	#ifdef CONFIG_64BIT
	if (unlikely(b[0]))
	return __ffs(b[0]);
	if (unlikely(b[1]))
	return __ffs(b[1]) + 64;
	return __ffs(b[2]) + 128;
	#endif
	}

	/*
	* ffs - find first bit set
	* @x: the word to search
	*
	* This is defined the same way as
	* the libc and compiler builtin ffs routines, therefore
	* differs in spirit from the above ffz (man ffs).
	*/

	#define ffs(x) generic_ffs(x)

	/*
	* hweightN - returns the hamming weight of a N-bit word
	* @x: the word to weigh
	*
	* The Hamming Weight of a number is the total number of bits set in it.
	*/

	#define hweight64(x) generic_hweight64(x)
	#define hweight32(x) generic_hweight32(x)
	#define hweight16(x) generic_hweight16(x)
	#define hweight8(x) generic_hweight8(x)

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

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

	return retval;
	}

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

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

	return retval;
	}

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

	ADDR += nr >> 3;
	mask = 1 << (nr & 0x07);

	return ((mask & *ADDR) != 0);
	}

	static inline unsigned long find_next_zero_le_bit(unsigned long *addr,
	unsigned long size, unsigned long offset)
	{
	unsigned long p = ((unsigned long ) addr) + (offset >> SZLONG_LOG);
	unsigned long result = offset & ~SZLONG_MASK;
	unsigned long tmp;

	if (offset >= size)
	return size;
	size -= result;
	offset &= SZLONG_MASK;
	if (offset) {
	tmp = cpu_to_lelongp(p++);
	tmp \|= ~0UL >> (_MIPS_SZLONG-offset); /* bug or feature ? */
	if (size < _MIPS_SZLONG)
	goto found_first;
	if (~tmp)
	goto found_middle;
	size -= _MIPS_SZLONG;
	result += _MIPS_SZLONG;
	}
	while (size & ~SZLONG_MASK) {
	if (~(tmp = cpu_to_lelongp(p++)))
	goto found_middle;
	result += _MIPS_SZLONG;
	size -= _MIPS_SZLONG;
	}
	if (!size)
	return result;
	tmp = cpu_to_lelongp(p);

	found_first:
	tmp \|= ~0UL << size;
	if (tmp == ~0UL) /* Are any bits zero? */
	return result + size; /* Nope. */

	found_middle:
	return result + ffz(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), (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; \
	})
	#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.
	*
	* FIXME: These assume that Minix uses the native byte/bitorder.
	* This limits the Minix filesystem's value for data exchange very much.
	*/
	#define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
	#define minix_set_bit(nr,addr) set_bit(nr,addr)
	#define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
	#define minix_test_bit(nr,addr) test_bit(nr,addr)
	#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)

	#endif /* __KERNEL__ */

	#endif /* _ASM_BITOPS_H */