arch/mips/include/asm/bitops.h - linux - Git at Google

 /*
  * 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, 99, 2000, 06, 07  Ralf Baechle (ralf@linux-mips.org)
  * Copyright (c) 1999, 2000  Silicon Graphics, Inc.
  */
 #ifndef _ASM_BITOPS_H
 #define _ASM_BITOPS_H

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

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

 #define __bit_op(mem, insn, inputs...) do {			\
 	unsigned long __temp;					\
 								\
 	asm volatile(						\
 	"	.set		push			\n"	\
 	"	.set		" MIPS_ISA_LEVEL "	\n"	\
 	"	" __SYNC(full, loongson3_war) "		\n"	\
 	"1:	" __stringify(LONG_LL)	"	%0, %1	\n"	\
 	"	" insn		"			\n"	\
 	"	" __stringify(LONG_SC)	"	%0, %1	\n"	\
 	"	" __stringify(SC_BEQZ)	"	%0, 1b	\n"	\
 	"	.set		pop			\n"	\
 	: "=&r"(__temp), "+" GCC_OFF_SMALL_ASM()(mem)		\
 	: inputs						\
 	: __LLSC_CLOBBER);					\
 } while (0)

 #define __test_bit_op(mem, ll_dst, insn, inputs...) ({		\
 	unsigned long __orig, __temp;				\
 								\
 	asm volatile(						\
 	"	.set		push			\n"	\
 	"	.set		" MIPS_ISA_LEVEL "	\n"	\
 	"	" __SYNC(full, loongson3_war) "		\n"	\
 	"1:	" __stringify(LONG_LL) " "	ll_dst ", %2\n"	\
 	"	" insn		"			\n"	\
 	"	" __stringify(LONG_SC)	"	%1, %2	\n"	\
 	"	" __stringify(SC_BEQZ)	"	%1, 1b	\n"	\
 	"	.set		pop			\n"	\
 	: "=&r"(__orig), "=&r"(__temp),				\
 	  "+" GCC_OFF_SMALL_ASM()(mem)				\
 	: inputs						\
 	: __LLSC_CLOBBER);					\
 								\
 	__orig;							\
 })

 /*
  * These are the "slower" versions of the functions and are in bitops.c.
  * These functions call raw_local_irq_{save,restore}().
  */
 void __mips_set_bit(unsigned long nr, volatile unsigned long *addr);
 void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr);
 void __mips_change_bit(unsigned long nr, volatile unsigned long *addr);
 int __mips_test_and_set_bit_lock(unsigned long nr,
 				 volatile unsigned long *addr);
 int __mips_test_and_clear_bit(unsigned long nr,
 			      volatile unsigned long *addr);
 int __mips_test_and_change_bit(unsigned long nr,
 			       volatile unsigned long *addr);


 /*
  * 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)
 {
 	volatile unsigned long *m = &addr[BIT_WORD(nr)];
 	int bit = nr % BITS_PER_LONG;

 	if (!kernel_uses_llsc) {
 		__mips_set_bit(nr, addr);
 		return;
 	}

 	if ((MIPS_ISA_REV >= 2) && __builtin_constant_p(bit) && (bit >= 16)) {
 		__bit_op(*m, __stringify(LONG_INS) " %0, %3, %2, 1", "i"(bit), "r"(~0));
 		return;
 	}

 	__bit_op(*m, "or\t%0, %2", "ir"(BIT(bit)));
 }

 /*
  * 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_atomic() and/or smp_mb__after_atomic()
  * in order to ensure changes are visible on other processors.
  */
 static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	volatile unsigned long *m = &addr[BIT_WORD(nr)];
 	int bit = nr % BITS_PER_LONG;

 	if (!kernel_uses_llsc) {
 		__mips_clear_bit(nr, addr);
 		return;
 	}

 	if ((MIPS_ISA_REV >= 2) && __builtin_constant_p(bit)) {
 		__bit_op(*m, __stringify(LONG_INS) " %0, $0, %2, 1", "i"(bit));
 		return;
 	}

 	__bit_op(*m, "and\t%0, %2", "ir"(~BIT(bit)));
 }

 /*
  * clear_bit_unlock - Clears a bit in memory
  * @nr: Bit to clear
  * @addr: Address to start counting from
  *
  * clear_bit() is atomic and implies release semantics before the memory
  * operation. It can be used for an unlock.
  */
 static inline void clear_bit_unlock(unsigned long nr, volatile unsigned long *addr)
 {
 	smp_mb__before_atomic();
 	clear_bit(nr, addr);
 }

 /*
  * 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)
 {
 	volatile unsigned long *m = &addr[BIT_WORD(nr)];
 	int bit = nr % BITS_PER_LONG;

 	if (!kernel_uses_llsc) {
 		__mips_change_bit(nr, addr);
 		return;
 	}

 	__bit_op(*m, "xor\t%0, %2", "ir"(BIT(bit)));
 }

 /*
  * test_and_set_bit_lock - Set a bit and return its old value
  * @nr: Bit to set
  * @addr: Address to count from
  *
  * This operation is atomic and implies acquire ordering semantics
  * after the memory operation.
  */
 static inline int test_and_set_bit_lock(unsigned long nr,
 	volatile unsigned long *addr)
 {
 	volatile unsigned long *m = &addr[BIT_WORD(nr)];
 	int bit = nr % BITS_PER_LONG;
 	unsigned long res, orig;

 	if (!kernel_uses_llsc) {
 		res = __mips_test_and_set_bit_lock(nr, addr);
 	} else {
 		orig = __test_bit_op(*m, "%0",
 				     "or\t%1, %0, %3",
 				     "ir"(BIT(bit)));
 		res = (orig & BIT(bit)) != 0;
 	}

 	smp_llsc_mb();

 	return res;
 }

 /*
  * 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)
 {
 	smp_mb__before_atomic();
 	return test_and_set_bit_lock(nr, addr);
 }

 /*
  * 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)
 {
 	volatile unsigned long *m = &addr[BIT_WORD(nr)];
 	int bit = nr % BITS_PER_LONG;
 	unsigned long res, orig;

 	smp_mb__before_atomic();

 	if (!kernel_uses_llsc) {
 		res = __mips_test_and_clear_bit(nr, addr);
 	} else if ((MIPS_ISA_REV >= 2) && __builtin_constant_p(nr)) {
 		res = __test_bit_op(*m, "%1",
 				    __stringify(LONG_EXT) " %0, %1, %3, 1;"
 				    __stringify(LONG_INS) " %1, $0, %3, 1",
 				    "i"(bit));
 	} else {
 		orig = __test_bit_op(*m, "%0",
 				     "or\t%1, %0, %3;"
 				     "xor\t%1, %1, %3",
 				     "ir"(BIT(bit)));
 		res = (orig & BIT(bit)) != 0;
 	}

 	smp_llsc_mb();

 	return res;
 }

 /*
  * 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)
 {
 	volatile unsigned long *m = &addr[BIT_WORD(nr)];
 	int bit = nr % BITS_PER_LONG;
 	unsigned long res, orig;

 	smp_mb__before_atomic();

 	if (!kernel_uses_llsc) {
 		res = __mips_test_and_change_bit(nr, addr);
 	} else {
 		orig = __test_bit_op(*m, "%0",
 				     "xor\t%1, %0, %3",
 				     "ir"(BIT(bit)));
 		res = (orig & BIT(bit)) != 0;
 	}

 	smp_llsc_mb();

 	return res;
 }

 #undef __bit_op
 #undef __test_bit_op

 #include <asm-generic/bitops/non-atomic.h>

 /*
  * __clear_bit_unlock - Clears a bit in memory
  * @nr: Bit to clear
  * @addr: Address to start counting from
  *
  * __clear_bit() is non-atomic and implies release semantics before the memory
  * operation. It can be used for an unlock if no other CPUs can concurrently
  * modify other bits in the word.
  */
 static inline void __clear_bit_unlock(unsigned long nr, volatile unsigned long *addr)
 {
 	smp_mb__before_llsc();
 	__clear_bit(nr, addr);
 	nudge_writes();
 }

 /*
  * Return the bit position (0..63) of the most significant 1 bit in a word
  * Returns -1 if no 1 bit exists
  */
 static __always_inline unsigned long __fls(unsigned long word)
 {
 	int num;

 	if (BITS_PER_LONG == 32 && !__builtin_constant_p(word) &&
 	    __builtin_constant_p(cpu_has_clo_clz) && cpu_has_clo_clz) {
 		__asm__(
 		"	.set	push					\n"
 		"	.set	"MIPS_ISA_LEVEL"			\n"
 		"	clz	%0, %1					\n"
 		"	.set	pop					\n"
 		: "=r" (num)
 		: "r" (word));

 		return 31 - num;
 	}

 	if (BITS_PER_LONG == 64 && !__builtin_constant_p(word) &&
 	    __builtin_constant_p(cpu_has_mips64) && cpu_has_mips64) {
 		__asm__(
 		"	.set	push					\n"
 		"	.set	"MIPS_ISA_LEVEL"			\n"
 		"	dclz	%0, %1					\n"
 		"	.set	pop					\n"
 		: "=r" (num)
 		: "r" (word));

 		return 63 - num;
 	}

 	num = BITS_PER_LONG - 1;

 #if BITS_PER_LONG == 64
 	if (!(word & (~0ul << 32))) {
 		num -= 32;
 		word <<= 32;
 	}
 #endif
 	if (!(word & (~0ul << (BITS_PER_LONG-16)))) {
 		num -= 16;
 		word <<= 16;
 	}
 	if (!(word & (~0ul << (BITS_PER_LONG-8)))) {
 		num -= 8;
 		word <<= 8;
 	}
 	if (!(word & (~0ul << (BITS_PER_LONG-4)))) {
 		num -= 4;
 		word <<= 4;
 	}
 	if (!(word & (~0ul << (BITS_PER_LONG-2)))) {
 		num -= 2;
 		word <<= 2;
 	}
 	if (!(word & (~0ul << (BITS_PER_LONG-1))))
 		num -= 1;
 	return num;
 }

 /*
  * __ffs - find first bit in word.
  * @word: The word to search
  *
  * Returns 0..SZLONG-1
  * Undefined if no bit exists, so code should check against 0 first.
  */
 static __always_inline unsigned long __ffs(unsigned long word)
 {
 	return __fls(word & -word);
 }

 /*
  * fls - find last bit set.
  * @word: The word to search
  *
  * This is defined the same way as ffs.
  * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
  */
 static inline int fls(unsigned int x)
 {
 	int r;

 	if (!__builtin_constant_p(x) &&
 	    __builtin_constant_p(cpu_has_clo_clz) && cpu_has_clo_clz) {
 		__asm__(
 		"	.set	push					\n"
 		"	.set	"MIPS_ISA_LEVEL"			\n"
 		"	clz	%0, %1					\n"
 		"	.set	pop					\n"
 		: "=r" (x)
 		: "r" (x));

 		return 32 - x;
 	}

 	r = 32;
 	if (!x)
 		return 0;
 	if (!(x & 0xffff0000u)) {
 		x <<= 16;
 		r -= 16;
 	}
 	if (!(x & 0xff000000u)) {
 		x <<= 8;
 		r -= 8;
 	}
 	if (!(x & 0xf0000000u)) {
 		x <<= 4;
 		r -= 4;
 	}
 	if (!(x & 0xc0000000u)) {
 		x <<= 2;
 		r -= 2;
 	}
 	if (!(x & 0x80000000u)) {
 		x <<= 1;
 		r -= 1;
 	}
 	return r;
 }

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

 /*
  * ffs - find first bit set.
  * @word: The word to search
  *
  * This is defined the same way as
  * the libc and compiler builtin ffs routines, therefore
  * differs in spirit from the below ffz (man ffs).
  */
 static inline int ffs(int word)
 {
 	if (!word)
 		return 0;

 	return fls(word & -word);
 }

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

 #ifdef __KERNEL__

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

 #include <asm/arch_hweight.h>
 #include <asm-generic/bitops/const_hweight.h>

 #include <asm-generic/bitops/le.h>
 #include <asm-generic/bitops/ext2-atomic.h>

 #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, 99, 2000, 06, 07 Ralf Baechle (ralf@linux-mips.org)
	* Copyright (c) 1999, 2000 Silicon Graphics, Inc.
	*/
	#ifndef _ASM_BITOPS_H
	#define _ASM_BITOPS_H

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

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

	#define __bit_op(mem, insn, inputs...) do { \
	unsigned long __temp; \
	\
	asm volatile( \
	" .set push \n" \
	" .set " MIPS_ISA_LEVEL " \n" \
	" " __SYNC(full, loongson3_war) " \n" \
	"1: " __stringify(LONG_LL) " %0, %1 \n" \
	" " insn " \n" \
	" " __stringify(LONG_SC) " %0, %1 \n" \
	" " __stringify(SC_BEQZ) " %0, 1b \n" \
	" .set pop \n" \
	: "=&r"(__temp), "+" GCC_OFF_SMALL_ASM()(mem) \
	: inputs \
	: __LLSC_CLOBBER); \
	} while (0)

	#define __test_bit_op(mem, ll_dst, insn, inputs...) ({ \
	unsigned long __orig, __temp; \
	\
	asm volatile( \
	" .set push \n" \
	" .set " MIPS_ISA_LEVEL " \n" \
	" " __SYNC(full, loongson3_war) " \n" \
	"1: " __stringify(LONG_LL) " " ll_dst ", %2\n" \
	" " insn " \n" \
	" " __stringify(LONG_SC) " %1, %2 \n" \
	" " __stringify(SC_BEQZ) " %1, 1b \n" \
	" .set pop \n" \
	: "=&r"(__orig), "=&r"(__temp), \
	"+" GCC_OFF_SMALL_ASM()(mem) \
	: inputs \
	: __LLSC_CLOBBER); \
	\
	__orig; \
	})

	/*
	* These are the "slower" versions of the functions and are in bitops.c.
	* These functions call raw_local_irq_{save,restore}().
	*/
	void __mips_set_bit(unsigned long nr, volatile unsigned long *addr);
	void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr);
	void __mips_change_bit(unsigned long nr, volatile unsigned long *addr);
	int __mips_test_and_set_bit_lock(unsigned long nr,
	volatile unsigned long *addr);
	int __mips_test_and_clear_bit(unsigned long nr,
	volatile unsigned long *addr);
	int __mips_test_and_change_bit(unsigned long nr,
	volatile unsigned long *addr);


	/*
	* 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)
	{
	volatile unsigned long *m = &addr[BIT_WORD(nr)];
	int bit = nr % BITS_PER_LONG;

	if (!kernel_uses_llsc) {
	__mips_set_bit(nr, addr);
	return;
	}

	if ((MIPS_ISA_REV >= 2) && __builtin_constant_p(bit) && (bit >= 16)) {
	__bit_op(*m, __stringify(LONG_INS) " %0, %3, %2, 1", "i"(bit), "r"(~0));
	return;
	}

	__bit_op(*m, "or\t%0, %2", "ir"(BIT(bit)));
	}

	/*
	* 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_atomic() and/or smp_mb__after_atomic()
	* in order to ensure changes are visible on other processors.
	*/
	static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
	{
	volatile unsigned long *m = &addr[BIT_WORD(nr)];
	int bit = nr % BITS_PER_LONG;

	if (!kernel_uses_llsc) {
	__mips_clear_bit(nr, addr);
	return;
	}

	if ((MIPS_ISA_REV >= 2) && __builtin_constant_p(bit)) {
	__bit_op(*m, __stringify(LONG_INS) " %0, $0, %2, 1", "i"(bit));
	return;
	}

	__bit_op(*m, "and\t%0, %2", "ir"(~BIT(bit)));
	}

	/*
	* clear_bit_unlock - Clears a bit in memory
	* @nr: Bit to clear
	* @addr: Address to start counting from
	*
	* clear_bit() is atomic and implies release semantics before the memory
	* operation. It can be used for an unlock.
	*/
	static inline void clear_bit_unlock(unsigned long nr, volatile unsigned long *addr)
	{
	smp_mb__before_atomic();
	clear_bit(nr, addr);
	}

	/*
	* 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)
	{
	volatile unsigned long *m = &addr[BIT_WORD(nr)];
	int bit = nr % BITS_PER_LONG;

	if (!kernel_uses_llsc) {
	__mips_change_bit(nr, addr);
	return;
	}

	__bit_op(*m, "xor\t%0, %2", "ir"(BIT(bit)));
	}

	/*
	* test_and_set_bit_lock - Set a bit and return its old value
	* @nr: Bit to set
	* @addr: Address to count from
	*
	* This operation is atomic and implies acquire ordering semantics
	* after the memory operation.
	*/
	static inline int test_and_set_bit_lock(unsigned long nr,
	volatile unsigned long *addr)
	{
	volatile unsigned long *m = &addr[BIT_WORD(nr)];
	int bit = nr % BITS_PER_LONG;
	unsigned long res, orig;

	if (!kernel_uses_llsc) {
	res = __mips_test_and_set_bit_lock(nr, addr);
	} else {
	orig = __test_bit_op(*m, "%0",
	"or\t%1, %0, %3",
	"ir"(BIT(bit)));
	res = (orig & BIT(bit)) != 0;
	}

	smp_llsc_mb();

	return res;
	}

	/*
	* 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)
	{
	smp_mb__before_atomic();
	return test_and_set_bit_lock(nr, addr);
	}

	/*
	* 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)
	{
	volatile unsigned long *m = &addr[BIT_WORD(nr)];
	int bit = nr % BITS_PER_LONG;
	unsigned long res, orig;

	smp_mb__before_atomic();

	if (!kernel_uses_llsc) {
	res = __mips_test_and_clear_bit(nr, addr);
	} else if ((MIPS_ISA_REV >= 2) && __builtin_constant_p(nr)) {
	res = __test_bit_op(*m, "%1",
	__stringify(LONG_EXT) " %0, %1, %3, 1;"
	__stringify(LONG_INS) " %1, $0, %3, 1",
	"i"(bit));
	} else {
	orig = __test_bit_op(*m, "%0",
	"or\t%1, %0, %3;"
	"xor\t%1, %1, %3",
	"ir"(BIT(bit)));
	res = (orig & BIT(bit)) != 0;
	}

	smp_llsc_mb();

	return res;
	}

	/*
	* 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)
	{
	volatile unsigned long *m = &addr[BIT_WORD(nr)];
	int bit = nr % BITS_PER_LONG;
	unsigned long res, orig;

	smp_mb__before_atomic();

	if (!kernel_uses_llsc) {
	res = __mips_test_and_change_bit(nr, addr);
	} else {
	orig = __test_bit_op(*m, "%0",
	"xor\t%1, %0, %3",
	"ir"(BIT(bit)));
	res = (orig & BIT(bit)) != 0;
	}

	smp_llsc_mb();

	return res;
	}

	#undef __bit_op
	#undef __test_bit_op

	#include <asm-generic/bitops/non-atomic.h>

	/*
	* __clear_bit_unlock - Clears a bit in memory
	* @nr: Bit to clear
	* @addr: Address to start counting from
	*
	* __clear_bit() is non-atomic and implies release semantics before the memory
	* operation. It can be used for an unlock if no other CPUs can concurrently
	* modify other bits in the word.
	*/
	static inline void __clear_bit_unlock(unsigned long nr, volatile unsigned long *addr)
	{
	smp_mb__before_llsc();
	__clear_bit(nr, addr);
	nudge_writes();
	}

	/*
	* Return the bit position (0..63) of the most significant 1 bit in a word
	* Returns -1 if no 1 bit exists
	*/
	static __always_inline unsigned long __fls(unsigned long word)
	{
	int num;

	if (BITS_PER_LONG == 32 && !__builtin_constant_p(word) &&
	__builtin_constant_p(cpu_has_clo_clz) && cpu_has_clo_clz) {
	__asm__(
	" .set push \n"
	" .set "MIPS_ISA_LEVEL" \n"
	" clz %0, %1 \n"
	" .set pop \n"
	: "=r" (num)
	: "r" (word));

	return 31 - num;
	}

	if (BITS_PER_LONG == 64 && !__builtin_constant_p(word) &&
	__builtin_constant_p(cpu_has_mips64) && cpu_has_mips64) {
	__asm__(
	" .set push \n"
	" .set "MIPS_ISA_LEVEL" \n"
	" dclz %0, %1 \n"
	" .set pop \n"
	: "=r" (num)
	: "r" (word));

	return 63 - num;
	}

	num = BITS_PER_LONG - 1;

	#if BITS_PER_LONG == 64
	if (!(word & (~0ul << 32))) {
	num -= 32;
	word <<= 32;
	}
	#endif
	if (!(word & (~0ul << (BITS_PER_LONG-16)))) {
	num -= 16;
	word <<= 16;
	}
	if (!(word & (~0ul << (BITS_PER_LONG-8)))) {
	num -= 8;
	word <<= 8;
	}
	if (!(word & (~0ul << (BITS_PER_LONG-4)))) {
	num -= 4;
	word <<= 4;
	}
	if (!(word & (~0ul << (BITS_PER_LONG-2)))) {
	num -= 2;
	word <<= 2;
	}
	if (!(word & (~0ul << (BITS_PER_LONG-1))))
	num -= 1;
	return num;
	}

	/*
	* __ffs - find first bit in word.
	* @word: The word to search
	*
	* Returns 0..SZLONG-1
	* Undefined if no bit exists, so code should check against 0 first.
	*/
	static __always_inline unsigned long __ffs(unsigned long word)
	{
	return __fls(word & -word);
	}

	/*
	* fls - find last bit set.
	* @word: The word to search
	*
	* This is defined the same way as ffs.
	* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
	*/
	static inline int fls(unsigned int x)
	{
	int r;

	if (!__builtin_constant_p(x) &&
	__builtin_constant_p(cpu_has_clo_clz) && cpu_has_clo_clz) {
	__asm__(
	" .set push \n"
	" .set "MIPS_ISA_LEVEL" \n"
	" clz %0, %1 \n"
	" .set pop \n"
	: "=r" (x)
	: "r" (x));

	return 32 - x;
	}

	r = 32;
	if (!x)
	return 0;
	if (!(x & 0xffff0000u)) {
	x <<= 16;
	r -= 16;
	}
	if (!(x & 0xff000000u)) {
	x <<= 8;
	r -= 8;
	}
	if (!(x & 0xf0000000u)) {
	x <<= 4;
	r -= 4;
	}
	if (!(x & 0xc0000000u)) {
	x <<= 2;
	r -= 2;
	}
	if (!(x & 0x80000000u)) {
	x <<= 1;
	r -= 1;
	}
	return r;
	}

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

	/*
	* ffs - find first bit set.
	* @word: The word to search
	*
	* This is defined the same way as
	* the libc and compiler builtin ffs routines, therefore
	* differs in spirit from the below ffz (man ffs).
	*/
	static inline int ffs(int word)
	{
	if (!word)
	return 0;

	return fls(word & -word);
	}

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

	#ifdef __KERNEL__

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

	#include <asm/arch_hweight.h>
	#include <asm-generic/bitops/const_hweight.h>

	#include <asm-generic/bitops/le.h>
	#include <asm-generic/bitops/ext2-atomic.h>

	#endif /* __KERNEL__ */

	#endif /* _ASM_BITOPS_H */