include/asm-ia64/bitops.h - linux/kernel/git/davem/net-next - Git at Google

 #ifndef _ASM_IA64_BITOPS_H
 #define _ASM_IA64_BITOPS_H

 /*
  * Copyright (C) 1998-2003 Hewlett-Packard Co
  *	David Mosberger-Tang <davidm@hpl.hp.com>
  *
  * 02/06/02 find_next_bit() and find_first_bit() added from Erich Focht's ia64
  * O(1) scheduler patch
  */

 #include <linux/compiler.h>
 #include <linux/types.h>
 #include <asm/intrinsics.h>

 /**
  * 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.
  *
  * The address must be (at least) "long" aligned.
  * Note that there are driver (e.g., eepro100) which use these operations to
  * operate on hw-defined data-structures, so we can't easily change these
  * operations to force a bigger alignment.
  *
  * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
  */
 static __inline__ void
 set_bit (int nr, volatile void *addr)
 {
 	__u32 bit, old, new;
 	volatile __u32 *m;
 	CMPXCHG_BUGCHECK_DECL

 	m = (volatile __u32 *) addr + (nr >> 5);
 	bit = 1 << (nr & 31);
 	do {
 		CMPXCHG_BUGCHECK(m);
 		old = *m;
 		new = old | bit;
 	} while (cmpxchg_acq(m, old, new) != old);
 }

 /**
  * __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 (int nr, volatile void *addr)
 {
 	*((__u32 *) addr + (nr >> 5)) |= (1 << (nr & 31));
 }

 /*
  * clear_bit() has "acquire" semantics.
  */
 #define smp_mb__before_clear_bit()	smp_mb()
 #define smp_mb__after_clear_bit()	do { /* skip */; } while (0)

 /**
  * 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 (int nr, volatile void *addr)
 {
 	__u32 mask, old, new;
 	volatile __u32 *m;
 	CMPXCHG_BUGCHECK_DECL

 	m = (volatile __u32 *) addr + (nr >> 5);
 	mask = ~(1 << (nr & 31));
 	do {
 		CMPXCHG_BUGCHECK(m);
 		old = *m;
 		new = old & mask;
 	} while (cmpxchg_acq(m, old, new) != old);
 }

 /**
  * __clear_bit - Clears a bit in memory (non-atomic version)
  */
 static __inline__ void
 __clear_bit (int nr, volatile void *addr)
 {
 	volatile __u32 *p = (__u32 *) addr + (nr >> 5);
 	__u32 m = 1 << (nr & 31);
 	*p &= ~m;
 }

 /**
  * change_bit - Toggle a bit in memory
  * @nr: Bit to clear
  * @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 (int nr, volatile void *addr)
 {
 	__u32 bit, old, new;
 	volatile __u32 *m;
 	CMPXCHG_BUGCHECK_DECL

 	m = (volatile __u32 *) addr + (nr >> 5);
 	bit = (1 << (nr & 31));
 	do {
 		CMPXCHG_BUGCHECK(m);
 		old = *m;
 		new = old ^ bit;
 	} while (cmpxchg_acq(m, old, new) != old);
 }

 /**
  * __change_bit - Toggle a bit in memory
  * @nr: the bit to set
  * @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 (int nr, volatile void *addr)
 {
 	*((__u32 *) addr + (nr >> 5)) ^= (1 << (nr & 31));
 }

 /**
  * 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 (int nr, volatile void *addr)
 {
 	__u32 bit, old, new;
 	volatile __u32 *m;
 	CMPXCHG_BUGCHECK_DECL

 	m = (volatile __u32 *) addr + (nr >> 5);
 	bit = 1 << (nr & 31);
 	do {
 		CMPXCHG_BUGCHECK(m);
 		old = *m;
 		new = old | bit;
 	} while (cmpxchg_acq(m, old, new) != old);
 	return (old & bit) != 0;
 }

 /**
  * __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 (int nr, volatile void *addr)
 {
 	__u32 *p = (__u32 *) addr + (nr >> 5);
 	__u32 m = 1 << (nr & 31);
 	int oldbitset = (*p & m) != 0;

 	*p |= m;
 	return oldbitset;
 }

 /**
  * test_and_clear_bit - Clear 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_clear_bit (int nr, volatile void *addr)
 {
 	__u32 mask, old, new;
 	volatile __u32 *m;
 	CMPXCHG_BUGCHECK_DECL

 	m = (volatile __u32 *) addr + (nr >> 5);
 	mask = ~(1 << (nr & 31));
 	do {
 		CMPXCHG_BUGCHECK(m);
 		old = *m;
 		new = old & mask;
 	} while (cmpxchg_acq(m, old, new) != old);
 	return (old & ~mask) != 0;
 }

 /**
  * __test_and_clear_bit - Clear 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_clear_bit(int nr, volatile void * addr)
 {
 	__u32 *p = (__u32 *) addr + (nr >> 5);
 	__u32 m = 1 << (nr & 31);
 	int oldbitset = *p & m;

 	*p &= ~m;
 	return oldbitset;
 }

 /**
  * test_and_change_bit - Change 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_change_bit (int nr, volatile void *addr)
 {
 	__u32 bit, old, new;
 	volatile __u32 *m;
 	CMPXCHG_BUGCHECK_DECL

 	m = (volatile __u32 *) addr + (nr >> 5);
 	bit = (1 << (nr & 31));
 	do {
 		CMPXCHG_BUGCHECK(m);
 		old = *m;
 		new = old ^ bit;
 	} while (cmpxchg_acq(m, old, new) != old);
 	return (old & bit) != 0;
 }

 /*
  * WARNING: non atomic version.
  */
 static __inline__ int
 __test_and_change_bit (int nr, void *addr)
 {
 	__u32 old, bit = (1 << (nr & 31));
 	__u32 *m = (__u32 *) addr + (nr >> 5);

 	old = *m;
 	*m = old ^ bit;
 	return (old & bit) != 0;
 }

 static __inline__ int
 test_bit (int nr, const volatile void *addr)
 {
 	return 1 & (((const volatile __u32 *) addr)[nr >> 5] >> (nr & 31));
 }

 /**
  * ffz - find the first zero bit in a long word
  * @x: The long word to find the bit in
  *
  * Returns the bit-number (0..63) of the first (least significant) zero bit.
  * Undefined if no zero exists, so code should check against ~0UL first...
  */
 static inline unsigned long
 ffz (unsigned long x)
 {
 	unsigned long result;

 	result = ia64_popcnt(x & (~x - 1));
 	return result;
 }

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

 	result = ia64_popcnt((x-1) & ~x);
 	return result;
 }

 #ifdef __KERNEL__

 /*
  * Return bit number of last (most-significant) bit set.  Undefined
  * for x==0.  Bits are numbered from 0..63 (e.g., ia64_fls(9) == 3).
  */
 static inline unsigned long
 ia64_fls (unsigned long x)
 {
 	long double d = x;
 	long exp;

 	exp = ia64_getf_exp(d);
 	return exp - 0xffff;
 }

 /*
  * Find the last (most significant) bit set.  Returns 0 for x==0 and
  * bits are numbered from 1..32 (e.g., fls(9) == 4).
  */
 static inline int
 fls (int t)
 {
 	unsigned long x = t & 0xffffffffu;

 	if (!x)
 		return 0;
 	x |= x >> 1;
 	x |= x >> 2;
 	x |= x >> 4;
 	x |= x >> 8;
 	x |= x >> 16;
 	return ia64_popcnt(x);
 }

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

 /*
  * 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): it operates on "int" values only and the result value is the
  * bit number + 1.  ffs(0) is defined to return zero.
  */
 #define ffs(x)	__builtin_ffs(x)

 /*
  * hweightN: returns the hamming weight (i.e. the number
  * of bits set) of a N-bit word
  */
 static __inline__ unsigned long
 hweight64 (unsigned long x)
 {
 	unsigned long result;
 	result = ia64_popcnt(x);
 	return result;
 }

 #define hweight32(x)	(unsigned int) hweight64((x) & 0xfffffffful)
 #define hweight16(x)	(unsigned int) hweight64((x) & 0xfffful)
 #define hweight8(x)	(unsigned int) hweight64((x) & 0xfful)

 #endif /* __KERNEL__ */

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

 #ifdef __KERNEL__

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

 #define ext2_set_bit_atomic(l,n,a)	test_and_set_bit(n,a)
 #define ext2_clear_bit_atomic(l,n,a)	test_and_clear_bit(n,a)

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

 #endif /* __KERNEL__ */

 #endif /* _ASM_IA64_BITOPS_H */
	#ifndef _ASM_IA64_BITOPS_H
	#define _ASM_IA64_BITOPS_H

	/*
	* Copyright (C) 1998-2003 Hewlett-Packard Co
	* David Mosberger-Tang <davidm@hpl.hp.com>
	*
	* 02/06/02 find_next_bit() and find_first_bit() added from Erich Focht's ia64
	* O(1) scheduler patch
	*/

	#include <linux/compiler.h>
	#include <linux/types.h>
	#include <asm/intrinsics.h>

	/**
	* 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.
	*
	* The address must be (at least) "long" aligned.
	* Note that there are driver (e.g., eepro100) which use these operations to
	* operate on hw-defined data-structures, so we can't easily change these
	* operations to force a bigger alignment.
	*
	* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
	*/
	static __inline__ void
	set_bit (int nr, volatile void *addr)
	{
	__u32 bit, old, new;
	volatile __u32 *m;
	CMPXCHG_BUGCHECK_DECL

	m = (volatile __u32 *) addr + (nr >> 5);
	bit = 1 << (nr & 31);
	do {
	CMPXCHG_BUGCHECK(m);
	old = *m;
	new = old \| bit;
	} while (cmpxchg_acq(m, old, new) != old);
	}

	/**
	* __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 (int nr, volatile void *addr)
	{
	((__u32 ) addr + (nr >> 5)) \|= (1 << (nr & 31));
	}

	/*
	* clear_bit() has "acquire" semantics.
	*/
	#define smp_mb__before_clear_bit() smp_mb()
	#define smp_mb__after_clear_bit() do { /* skip */; } while (0)

	/**
	* 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 (int nr, volatile void *addr)
	{
	__u32 mask, old, new;
	volatile __u32 *m;
	CMPXCHG_BUGCHECK_DECL

	m = (volatile __u32 *) addr + (nr >> 5);
	mask = ~(1 << (nr & 31));
	do {
	CMPXCHG_BUGCHECK(m);
	old = *m;
	new = old & mask;
	} while (cmpxchg_acq(m, old, new) != old);
	}

	/**
	* __clear_bit - Clears a bit in memory (non-atomic version)
	*/
	static __inline__ void
	__clear_bit (int nr, volatile void *addr)
	{
	volatile __u32 p = (__u32 ) addr + (nr >> 5);
	__u32 m = 1 << (nr & 31);
	*p &= ~m;
	}

	/**
	* change_bit - Toggle a bit in memory
	* @nr: Bit to clear
	* @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 (int nr, volatile void *addr)
	{
	__u32 bit, old, new;
	volatile __u32 *m;
	CMPXCHG_BUGCHECK_DECL

	m = (volatile __u32 *) addr + (nr >> 5);
	bit = (1 << (nr & 31));
	do {
	CMPXCHG_BUGCHECK(m);
	old = *m;
	new = old ^ bit;
	} while (cmpxchg_acq(m, old, new) != old);
	}

	/**
	* __change_bit - Toggle a bit in memory
	* @nr: the bit to set
	* @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 (int nr, volatile void *addr)
	{
	((__u32 ) addr + (nr >> 5)) ^= (1 << (nr & 31));
	}

	/**
	* 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 (int nr, volatile void *addr)
	{
	__u32 bit, old, new;
	volatile __u32 *m;
	CMPXCHG_BUGCHECK_DECL

	m = (volatile __u32 *) addr + (nr >> 5);
	bit = 1 << (nr & 31);
	do {
	CMPXCHG_BUGCHECK(m);
	old = *m;
	new = old \| bit;
	} while (cmpxchg_acq(m, old, new) != old);
	return (old & bit) != 0;
	}

	/**
	* __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 (int nr, volatile void *addr)
	{
	__u32 p = (__u32 ) addr + (nr >> 5);
	__u32 m = 1 << (nr & 31);
	int oldbitset = (*p & m) != 0;

	*p \|= m;
	return oldbitset;
	}

	/**
	* test_and_clear_bit - Clear 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_clear_bit (int nr, volatile void *addr)
	{
	__u32 mask, old, new;
	volatile __u32 *m;
	CMPXCHG_BUGCHECK_DECL

	m = (volatile __u32 *) addr + (nr >> 5);
	mask = ~(1 << (nr & 31));
	do {
	CMPXCHG_BUGCHECK(m);
	old = *m;
	new = old & mask;
	} while (cmpxchg_acq(m, old, new) != old);
	return (old & ~mask) != 0;
	}

	/**
	* __test_and_clear_bit - Clear 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_clear_bit(int nr, volatile void * addr)
	{
	__u32 p = (__u32 ) addr + (nr >> 5);
	__u32 m = 1 << (nr & 31);
	int oldbitset = *p & m;

	*p &= ~m;
	return oldbitset;
	}

	/**
	* test_and_change_bit - Change 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_change_bit (int nr, volatile void *addr)
	{
	__u32 bit, old, new;
	volatile __u32 *m;
	CMPXCHG_BUGCHECK_DECL

	m = (volatile __u32 *) addr + (nr >> 5);
	bit = (1 << (nr & 31));
	do {
	CMPXCHG_BUGCHECK(m);
	old = *m;
	new = old ^ bit;
	} while (cmpxchg_acq(m, old, new) != old);
	return (old & bit) != 0;
	}

	/*
	* WARNING: non atomic version.
	*/
	static __inline__ int
	__test_and_change_bit (int nr, void *addr)
	{
	__u32 old, bit = (1 << (nr & 31));
	__u32 m = (__u32 ) addr + (nr >> 5);

	old = *m;
	*m = old ^ bit;
	return (old & bit) != 0;
	}

	static __inline__ int
	test_bit (int nr, const volatile void *addr)
	{
	return 1 & (((const volatile __u32 *) addr)[nr >> 5] >> (nr & 31));
	}

	/**
	* ffz - find the first zero bit in a long word
	* @x: The long word to find the bit in
	*
	* Returns the bit-number (0..63) of the first (least significant) zero bit.
	* Undefined if no zero exists, so code should check against ~0UL first...
	*/
	static inline unsigned long
	ffz (unsigned long x)
	{
	unsigned long result;

	result = ia64_popcnt(x & (~x - 1));
	return result;
	}

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

	result = ia64_popcnt((x-1) & ~x);
	return result;
	}

	#ifdef __KERNEL__

	/*
	* Return bit number of last (most-significant) bit set. Undefined
	* for x==0. Bits are numbered from 0..63 (e.g., ia64_fls(9) == 3).
	*/
	static inline unsigned long
	ia64_fls (unsigned long x)
	{
	long double d = x;
	long exp;

	exp = ia64_getf_exp(d);
	return exp - 0xffff;
	}

	/*
	* Find the last (most significant) bit set. Returns 0 for x==0 and
	* bits are numbered from 1..32 (e.g., fls(9) == 4).
	*/
	static inline int
	fls (int t)
	{
	unsigned long x = t & 0xffffffffu;

	if (!x)
	return 0;
	x \|= x >> 1;
	x \|= x >> 2;
	x \|= x >> 4;
	x \|= x >> 8;
	x \|= x >> 16;
	return ia64_popcnt(x);
	}

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

	/*
	* 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): it operates on "int" values only and the result value is the
	* bit number + 1. ffs(0) is defined to return zero.
	*/
	#define ffs(x) __builtin_ffs(x)

	/*
	* hweightN: returns the hamming weight (i.e. the number
	* of bits set) of a N-bit word
	*/
	static __inline__ unsigned long
	hweight64 (unsigned long x)
	{
	unsigned long result;
	result = ia64_popcnt(x);
	return result;
	}

	#define hweight32(x) (unsigned int) hweight64((x) & 0xfffffffful)
	#define hweight16(x) (unsigned int) hweight64((x) & 0xfffful)
	#define hweight8(x) (unsigned int) hweight64((x) & 0xfful)

	#endif /* __KERNEL__ */

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

	#ifdef __KERNEL__

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

	#define ext2_set_bit_atomic(l,n,a) test_and_set_bit(n,a)
	#define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a)

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

	#endif /* __KERNEL__ */

	#endif /* _ASM_IA64_BITOPS_H */