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

 #ifndef _ALPHA_BITOPS_H
 #define _ALPHA_BITOPS_H

 #include <asm/compiler.h>

 /*
  * Copyright 1994, Linus Torvalds.
  */

 /*
  * These have to be done with inline assembly: that way the bit-setting
  * is guaranteed to be atomic. All bit operations return 0 if the bit
  * was cleared before the operation and != 0 if it was not.
  *
  * To get proper branch prediction for the main line, we must branch
  * forward to code at the end of this object's .text section, then
  * branch back to restart the operation.
  *
  * bit 0 is the LSB of addr; bit 64 is the LSB of (addr+1).
  */

 static inline void
 set_bit(unsigned long nr, volatile void * addr)
 {
 	unsigned long temp;
 	int *m = ((int *) addr) + (nr >> 5);

 	__asm__ __volatile__(
 	"1:	ldl_l %0,%3\n"
 	"	bis %0,%2,%0\n"
 	"	stl_c %0,%1\n"
 	"	beq %0,2f\n"
 	".subsection 2\n"
 	"2:	br 1b\n"
 	".previous"
 	:"=&r" (temp), "=m" (*m)
 	:"Ir" (1UL << (nr & 31)), "m" (*m));
 }

 /*
  * WARNING: non atomic version.
  */
 static inline void
 __set_bit(unsigned long nr, volatile void * addr)
 {
 	int *m = ((int *) addr) + (nr >> 5);

 	*m |= 1 << (nr & 31);
 }

 #define smp_mb__before_clear_bit()	smp_mb()
 #define smp_mb__after_clear_bit()	smp_mb()

 static inline void
 clear_bit(unsigned long nr, volatile void * addr)
 {
 	unsigned long temp;
 	int *m = ((int *) addr) + (nr >> 5);

 	__asm__ __volatile__(
 	"1:	ldl_l %0,%3\n"
 	"	bic %0,%2,%0\n"
 	"	stl_c %0,%1\n"
 	"	beq %0,2f\n"
 	".subsection 2\n"
 	"2:	br 1b\n"
 	".previous"
 	:"=&r" (temp), "=m" (*m)
 	:"Ir" (1UL << (nr & 31)), "m" (*m));
 }

 /*
  * WARNING: non atomic version.
  */
 static __inline__ void
 __clear_bit(unsigned long nr, volatile void * addr)
 {
 	int *m = ((int *) addr) + (nr >> 5);

 	*m &= ~(1 << (nr & 31));
 }

 static inline void
 change_bit(unsigned long nr, volatile void * addr)
 {
 	unsigned long temp;
 	int *m = ((int *) addr) + (nr >> 5);

 	__asm__ __volatile__(
 	"1:	ldl_l %0,%3\n"
 	"	xor %0,%2,%0\n"
 	"	stl_c %0,%1\n"
 	"	beq %0,2f\n"
 	".subsection 2\n"
 	"2:	br 1b\n"
 	".previous"
 	:"=&r" (temp), "=m" (*m)
 	:"Ir" (1UL << (nr & 31)), "m" (*m));
 }

 /*
  * WARNING: non atomic version.
  */
 static __inline__ void
 __change_bit(unsigned long nr, volatile void * addr)
 {
 	int *m = ((int *) addr) + (nr >> 5);

 	*m ^= 1 << (nr & 31);
 }

 static inline int
 test_and_set_bit(unsigned long nr, volatile void *addr)
 {
 	unsigned long oldbit;
 	unsigned long temp;
 	int *m = ((int *) addr) + (nr >> 5);

 	__asm__ __volatile__(
 	"1:	ldl_l %0,%4\n"
 	"	and %0,%3,%2\n"
 	"	bne %2,2f\n"
 	"	xor %0,%3,%0\n"
 	"	stl_c %0,%1\n"
 	"	beq %0,3f\n"
 	"2:\n"
 #ifdef CONFIG_SMP
 	"	mb\n"
 #endif
 	".subsection 2\n"
 	"3:	br 1b\n"
 	".previous"
 	:"=&r" (temp), "=m" (*m), "=&r" (oldbit)
 	:"Ir" (1UL << (nr & 31)), "m" (*m) : "memory");

 	return oldbit != 0;
 }

 /*
  * WARNING: non atomic version.
  */
 static inline int
 __test_and_set_bit(unsigned long nr, volatile void * addr)
 {
 	unsigned long mask = 1 << (nr & 0x1f);
 	int *m = ((int *) addr) + (nr >> 5);
 	int old = *m;

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

 static inline int
 test_and_clear_bit(unsigned long nr, volatile void * addr)
 {
 	unsigned long oldbit;
 	unsigned long temp;
 	int *m = ((int *) addr) + (nr >> 5);

 	__asm__ __volatile__(
 	"1:	ldl_l %0,%4\n"
 	"	and %0,%3,%2\n"
 	"	beq %2,2f\n"
 	"	xor %0,%3,%0\n"
 	"	stl_c %0,%1\n"
 	"	beq %0,3f\n"
 	"2:\n"
 #ifdef CONFIG_SMP
 	"	mb\n"
 #endif
 	".subsection 2\n"
 	"3:	br 1b\n"
 	".previous"
 	:"=&r" (temp), "=m" (*m), "=&r" (oldbit)
 	:"Ir" (1UL << (nr & 31)), "m" (*m) : "memory");

 	return oldbit != 0;
 }

 /*
  * WARNING: non atomic version.
  */
 static inline int
 __test_and_clear_bit(unsigned long nr, volatile void * addr)
 {
 	unsigned long mask = 1 << (nr & 0x1f);
 	int *m = ((int *) addr) + (nr >> 5);
 	int old = *m;

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

 static inline int
 test_and_change_bit(unsigned long nr, volatile void * addr)
 {
 	unsigned long oldbit;
 	unsigned long temp;
 	int *m = ((int *) addr) + (nr >> 5);

 	__asm__ __volatile__(
 	"1:	ldl_l %0,%4\n"
 	"	and %0,%3,%2\n"
 	"	xor %0,%3,%0\n"
 	"	stl_c %0,%1\n"
 	"	beq %0,3f\n"
 #ifdef CONFIG_SMP
 	"	mb\n"
 #endif
 	".subsection 2\n"
 	"3:	br 1b\n"
 	".previous"
 	:"=&r" (temp), "=m" (*m), "=&r" (oldbit)
 	:"Ir" (1UL << (nr & 31)), "m" (*m) : "memory");

 	return oldbit != 0;
 }

 /*
  * WARNING: non atomic version.
  */
 static __inline__ int
 __test_and_change_bit(unsigned long nr, volatile void * addr)
 {
 	unsigned long mask = 1 << (nr & 0x1f);
 	int *m = ((int *) addr) + (nr >> 5);
 	int old = *m;

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

 static inline int
 test_bit(int nr, const volatile void * addr)
 {
 	return (1UL & (((const int *) addr)[nr >> 5] >> (nr & 31))) != 0UL;
 }

 /*
  * ffz = Find First Zero in word. Undefined if no zero exists,
  * so code should check against ~0UL first..
  *
  * Do a binary search on the bits.  Due to the nature of large
  * constants on the alpha, it is worthwhile to split the search.
  */
 static inline unsigned long ffz_b(unsigned long x)
 {
 	unsigned long sum, x1, x2, x4;

 	x = ~x & -~x;		/* set first 0 bit, clear others */
 	x1 = x & 0xAA;
 	x2 = x & 0xCC;
 	x4 = x & 0xF0;
 	sum = x2 ? 2 : 0;
 	sum += (x4 != 0) * 4;
 	sum += (x1 != 0);

 	return sum;
 }

 static inline unsigned long ffz(unsigned long word)
 {
 #if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
 	/* Whee.  EV67 can calculate it directly.  */
 	return __kernel_cttz(~word);
 #else
 	unsigned long bits, qofs, bofs;

 	bits = __kernel_cmpbge(word, ~0UL);
 	qofs = ffz_b(bits);
 	bits = __kernel_extbl(word, qofs);
 	bofs = ffz_b(bits);

 	return qofs*8 + bofs;
 #endif
 }

 /*
  * __ffs = Find First set bit in word.  Undefined if no set bit exists.
  */
 static inline unsigned long __ffs(unsigned long word)
 {
 #if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
 	/* Whee.  EV67 can calculate it directly.  */
 	return __kernel_cttz(word);
 #else
 	unsigned long bits, qofs, bofs;

 	bits = __kernel_cmpbge(0, word);
 	qofs = ffz_b(bits);
 	bits = __kernel_extbl(word, qofs);
 	bofs = ffz_b(~bits);

 	return qofs*8 + bofs;
 #endif
 }

 #ifdef __KERNEL__

 /*
  * ffs: find first bit set. This is defined the same way as
  * the libc and compiler builtin ffs routines, therefore
  * differs in spirit from the above __ffs.
  */

 static inline int ffs(int word)
 {
 	int result = __ffs(word) + 1;
 	return word ? result : 0;
 }

 /*
  * fls: find last bit set.
  */
 #if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
 static inline int fls(int word)
 {
 	return 64 - __kernel_ctlz(word & 0xffffffff);
 }
 #else
 #include <asm-generic/bitops/fls.h>
 #endif
 #include <asm-generic/bitops/fls64.h>

 /* Compute powers of two for the given integer.  */
 static inline long floor_log2(unsigned long word)
 {
 #if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
 	return 63 - __kernel_ctlz(word);
 #else
 	long bit;
 	for (bit = -1; word ; bit++)
 		word >>= 1;
 	return bit;
 #endif
 }

 static inline long ceil_log2(unsigned long word)
 {
 	long bit = floor_log2(word);
 	return bit + (word > (1UL << bit));
 }

 /*
  * hweightN: returns the hamming weight (i.e. the number
  * of bits set) of a N-bit word
  */

 #if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
 /* Whee.  EV67 can calculate it directly.  */
 static inline unsigned long hweight64(unsigned long w)
 {
 	return __kernel_ctpop(w);
 }

 #define hweight32(x)	(unsigned int) hweight64((x) & 0xfffffffful)
 #define hweight16(x)	(unsigned int) hweight64((x) & 0xfffful)
 #define hweight8(x)	(unsigned int) hweight64((x) & 0xfful)
 #else
 #include <asm-generic/bitops/hweight.h>
 #endif

 #endif /* __KERNEL__ */

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

 #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 set.
  */
 static inline unsigned long
 sched_find_first_bit(unsigned long b[3])
 {
 	unsigned long b0 = b[0], b1 = b[1], b2 = b[2];
 	unsigned long ofs;

 	ofs = (b1 ? 64 : 128);
 	b1 = (b1 ? b1 : b2);
 	ofs = (b0 ? 0 : ofs);
 	b0 = (b0 ? b0 : b1);

 	return __ffs(b0) + ofs;
 }

 #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>

 #endif /* __KERNEL__ */

 #endif /* _ALPHA_BITOPS_H */
	#ifndef _ALPHA_BITOPS_H
	#define _ALPHA_BITOPS_H

	#include <asm/compiler.h>

	/*
	* Copyright 1994, Linus Torvalds.
	*/

	/*
	* These have to be done with inline assembly: that way the bit-setting
	* is guaranteed to be atomic. All bit operations return 0 if the bit
	* was cleared before the operation and != 0 if it was not.
	*
	* To get proper branch prediction for the main line, we must branch
	* forward to code at the end of this object's .text section, then
	* branch back to restart the operation.
	*
	* bit 0 is the LSB of addr; bit 64 is the LSB of (addr+1).
	*/

	static inline void
	set_bit(unsigned long nr, volatile void * addr)
	{
	unsigned long temp;
	int m = ((int ) addr) + (nr >> 5);

	__asm__ __volatile__(
	"1: ldl_l %0,%3\n"
	" bis %0,%2,%0\n"
	" stl_c %0,%1\n"
	" beq %0,2f\n"
	".subsection 2\n"
	"2: br 1b\n"
	".previous"
	:"=&r" (temp), "=m" (*m)
	:"Ir" (1UL << (nr & 31)), "m" (*m));
	}

	/*
	* WARNING: non atomic version.
	*/
	static inline void
	__set_bit(unsigned long nr, volatile void * addr)
	{
	int m = ((int ) addr) + (nr >> 5);

	*m \|= 1 << (nr & 31);
	}

	#define smp_mb__before_clear_bit() smp_mb()
	#define smp_mb__after_clear_bit() smp_mb()

	static inline void
	clear_bit(unsigned long nr, volatile void * addr)
	{
	unsigned long temp;
	int m = ((int ) addr) + (nr >> 5);

	__asm__ __volatile__(
	"1: ldl_l %0,%3\n"
	" bic %0,%2,%0\n"
	" stl_c %0,%1\n"
	" beq %0,2f\n"
	".subsection 2\n"
	"2: br 1b\n"
	".previous"
	:"=&r" (temp), "=m" (*m)
	:"Ir" (1UL << (nr & 31)), "m" (*m));
	}

	/*
	* WARNING: non atomic version.
	*/
	static __inline__ void
	__clear_bit(unsigned long nr, volatile void * addr)
	{
	int m = ((int ) addr) + (nr >> 5);

	*m &= ~(1 << (nr & 31));
	}

	static inline void
	change_bit(unsigned long nr, volatile void * addr)
	{
	unsigned long temp;
	int m = ((int ) addr) + (nr >> 5);

	__asm__ __volatile__(
	"1: ldl_l %0,%3\n"
	" xor %0,%2,%0\n"
	" stl_c %0,%1\n"
	" beq %0,2f\n"
	".subsection 2\n"
	"2: br 1b\n"
	".previous"
	:"=&r" (temp), "=m" (*m)
	:"Ir" (1UL << (nr & 31)), "m" (*m));
	}

	/*
	* WARNING: non atomic version.
	*/
	static __inline__ void
	__change_bit(unsigned long nr, volatile void * addr)
	{
	int m = ((int ) addr) + (nr >> 5);

	*m ^= 1 << (nr & 31);
	}

	static inline int
	test_and_set_bit(unsigned long nr, volatile void *addr)
	{
	unsigned long oldbit;
	unsigned long temp;
	int m = ((int ) addr) + (nr >> 5);

	__asm__ __volatile__(
	"1: ldl_l %0,%4\n"
	" and %0,%3,%2\n"
	" bne %2,2f\n"
	" xor %0,%3,%0\n"
	" stl_c %0,%1\n"
	" beq %0,3f\n"
	"2:\n"
	#ifdef CONFIG_SMP
	" mb\n"
	#endif
	".subsection 2\n"
	"3: br 1b\n"
	".previous"
	:"=&r" (temp), "=m" (*m), "=&r" (oldbit)
	:"Ir" (1UL << (nr & 31)), "m" (*m) : "memory");

	return oldbit != 0;
	}

	/*
	* WARNING: non atomic version.
	*/
	static inline int
	__test_and_set_bit(unsigned long nr, volatile void * addr)
	{
	unsigned long mask = 1 << (nr & 0x1f);
	int m = ((int ) addr) + (nr >> 5);
	int old = *m;

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

	static inline int
	test_and_clear_bit(unsigned long nr, volatile void * addr)
	{
	unsigned long oldbit;
	unsigned long temp;
	int m = ((int ) addr) + (nr >> 5);

	__asm__ __volatile__(
	"1: ldl_l %0,%4\n"
	" and %0,%3,%2\n"
	" beq %2,2f\n"
	" xor %0,%3,%0\n"
	" stl_c %0,%1\n"
	" beq %0,3f\n"
	"2:\n"
	#ifdef CONFIG_SMP
	" mb\n"
	#endif
	".subsection 2\n"
	"3: br 1b\n"
	".previous"
	:"=&r" (temp), "=m" (*m), "=&r" (oldbit)
	:"Ir" (1UL << (nr & 31)), "m" (*m) : "memory");

	return oldbit != 0;
	}

	/*
	* WARNING: non atomic version.
	*/
	static inline int
	__test_and_clear_bit(unsigned long nr, volatile void * addr)
	{
	unsigned long mask = 1 << (nr & 0x1f);
	int m = ((int ) addr) + (nr >> 5);
	int old = *m;

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

	static inline int
	test_and_change_bit(unsigned long nr, volatile void * addr)
	{
	unsigned long oldbit;
	unsigned long temp;
	int m = ((int ) addr) + (nr >> 5);

	__asm__ __volatile__(
	"1: ldl_l %0,%4\n"
	" and %0,%3,%2\n"
	" xor %0,%3,%0\n"
	" stl_c %0,%1\n"
	" beq %0,3f\n"
	#ifdef CONFIG_SMP
	" mb\n"
	#endif
	".subsection 2\n"
	"3: br 1b\n"
	".previous"
	:"=&r" (temp), "=m" (*m), "=&r" (oldbit)
	:"Ir" (1UL << (nr & 31)), "m" (*m) : "memory");

	return oldbit != 0;
	}

	/*
	* WARNING: non atomic version.
	*/
	static __inline__ int
	__test_and_change_bit(unsigned long nr, volatile void * addr)
	{
	unsigned long mask = 1 << (nr & 0x1f);
	int m = ((int ) addr) + (nr >> 5);
	int old = *m;

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

	static inline int
	test_bit(int nr, const volatile void * addr)
	{
	return (1UL & (((const int *) addr)[nr >> 5] >> (nr & 31))) != 0UL;
	}

	/*
	* ffz = Find First Zero in word. Undefined if no zero exists,
	* so code should check against ~0UL first..
	*
	* Do a binary search on the bits. Due to the nature of large
	* constants on the alpha, it is worthwhile to split the search.
	*/
	static inline unsigned long ffz_b(unsigned long x)
	{
	unsigned long sum, x1, x2, x4;

	x = ~x & -~x; /* set first 0 bit, clear others */
	x1 = x & 0xAA;
	x2 = x & 0xCC;
	x4 = x & 0xF0;
	sum = x2 ? 2 : 0;
	sum += (x4 != 0) * 4;
	sum += (x1 != 0);

	return sum;
	}

	static inline unsigned long ffz(unsigned long word)
	{
	#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
	/* Whee. EV67 can calculate it directly. */
	return __kernel_cttz(~word);
	#else
	unsigned long bits, qofs, bofs;

	bits = __kernel_cmpbge(word, ~0UL);
	qofs = ffz_b(bits);
	bits = __kernel_extbl(word, qofs);
	bofs = ffz_b(bits);

	return qofs*8 + bofs;
	#endif
	}

	/*
	* __ffs = Find First set bit in word. Undefined if no set bit exists.
	*/
	static inline unsigned long __ffs(unsigned long word)
	{
	#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
	/* Whee. EV67 can calculate it directly. */
	return __kernel_cttz(word);
	#else
	unsigned long bits, qofs, bofs;

	bits = __kernel_cmpbge(0, word);
	qofs = ffz_b(bits);
	bits = __kernel_extbl(word, qofs);
	bofs = ffz_b(~bits);

	return qofs*8 + bofs;
	#endif
	}

	#ifdef __KERNEL__

	/*
	* ffs: find first bit set. This is defined the same way as
	* the libc and compiler builtin ffs routines, therefore
	* differs in spirit from the above __ffs.
	*/

	static inline int ffs(int word)
	{
	int result = __ffs(word) + 1;
	return word ? result : 0;
	}

	/*
	* fls: find last bit set.
	*/
	#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
	static inline int fls(int word)
	{
	return 64 - __kernel_ctlz(word & 0xffffffff);
	}
	#else
	#include <asm-generic/bitops/fls.h>
	#endif
	#include <asm-generic/bitops/fls64.h>

	/* Compute powers of two for the given integer. */
	static inline long floor_log2(unsigned long word)
	{
	#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
	return 63 - __kernel_ctlz(word);
	#else
	long bit;
	for (bit = -1; word ; bit++)
	word >>= 1;
	return bit;
	#endif
	}

	static inline long ceil_log2(unsigned long word)
	{
	long bit = floor_log2(word);
	return bit + (word > (1UL << bit));
	}

	/*
	* hweightN: returns the hamming weight (i.e. the number
	* of bits set) of a N-bit word
	*/

	#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
	/* Whee. EV67 can calculate it directly. */
	static inline unsigned long hweight64(unsigned long w)
	{
	return __kernel_ctpop(w);
	}

	#define hweight32(x) (unsigned int) hweight64((x) & 0xfffffffful)
	#define hweight16(x) (unsigned int) hweight64((x) & 0xfffful)
	#define hweight8(x) (unsigned int) hweight64((x) & 0xfful)
	#else
	#include <asm-generic/bitops/hweight.h>
	#endif

	#endif /* __KERNEL__ */

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

	#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 set.
	*/
	static inline unsigned long
	sched_find_first_bit(unsigned long b[3])
	{
	unsigned long b0 = b[0], b1 = b[1], b2 = b[2];
	unsigned long ofs;

	ofs = (b1 ? 64 : 128);
	b1 = (b1 ? b1 : b2);
	ofs = (b0 ? 0 : ofs);
	b0 = (b0 ? b0 : b1);

	return __ffs(b0) + ofs;
	}

	#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>

	#endif /* __KERNEL__ */

	#endif /* _ALPHA_BITOPS_H */