arch/s390/include/asm/bitops.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  *    Copyright IBM Corp. 1999,2013
  *
  *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
  *
  * The description below was taken in large parts from the powerpc
  * bitops header file:
  * Within a word, bits are numbered LSB first.  Lot's of places make
  * this assumption by directly testing bits with (val & (1<<nr)).
  * This can cause confusion for large (> 1 word) bitmaps on a
  * big-endian system because, unlike little endian, the number of each
  * bit depends on the word size.
  *
  * The bitop functions are defined to work on unsigned longs, so the bits
  * end up numbered:
  *   |63..............0|127............64|191...........128|255...........192|
  *
  * We also have special functions which work with an MSB0 encoding.
  * The bits are numbered:
  *   |0..............63|64............127|128...........191|192...........255|
  *
  * The main difference is that bit 0-63 in the bit number field needs to be
  * reversed compared to the LSB0 encoded bit fields. This can be achieved by
  * XOR with 0x3f.
  *
  */

 #ifndef _S390_BITOPS_H
 #define _S390_BITOPS_H

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

 #include <linux/typecheck.h>
 #include <linux/compiler.h>
 #include <linux/types.h>
 #include <asm/atomic_ops.h>
 #include <asm/barrier.h>

 #define __BITOPS_WORDS(bits) (((bits) + BITS_PER_LONG - 1) / BITS_PER_LONG)

 static inline unsigned long *
 __bitops_word(unsigned long nr, const volatile unsigned long *ptr)
 {
 	unsigned long addr;

 	addr = (unsigned long)ptr + ((nr ^ (nr & (BITS_PER_LONG - 1))) >> 3);
 	return (unsigned long *)addr;
 }

 static inline unsigned long __bitops_mask(unsigned long nr)
 {
 	return 1UL << (nr & (BITS_PER_LONG - 1));
 }

 static __always_inline void arch_set_bit(unsigned long nr, volatile unsigned long *ptr)
 {
 	unsigned long *addr = __bitops_word(nr, ptr);
 	unsigned long mask = __bitops_mask(nr);

 	__atomic64_or(mask, (long *)addr);
 }

 static __always_inline void arch_clear_bit(unsigned long nr, volatile unsigned long *ptr)
 {
 	unsigned long *addr = __bitops_word(nr, ptr);
 	unsigned long mask = __bitops_mask(nr);

 	__atomic64_and(~mask, (long *)addr);
 }

 static __always_inline void arch_change_bit(unsigned long nr,
 					    volatile unsigned long *ptr)
 {
 	unsigned long *addr = __bitops_word(nr, ptr);
 	unsigned long mask = __bitops_mask(nr);

 	__atomic64_xor(mask, (long *)addr);
 }

 static inline bool arch_test_and_set_bit(unsigned long nr,
 					 volatile unsigned long *ptr)
 {
 	unsigned long *addr = __bitops_word(nr, ptr);
 	unsigned long mask = __bitops_mask(nr);
 	unsigned long old;

 	old = __atomic64_or_barrier(mask, (long *)addr);
 	return old & mask;
 }

 static inline bool arch_test_and_clear_bit(unsigned long nr,
 					   volatile unsigned long *ptr)
 {
 	unsigned long *addr = __bitops_word(nr, ptr);
 	unsigned long mask = __bitops_mask(nr);
 	unsigned long old;

 	old = __atomic64_and_barrier(~mask, (long *)addr);
 	return old & mask;
 }

 static inline bool arch_test_and_change_bit(unsigned long nr,
 					    volatile unsigned long *ptr)
 {
 	unsigned long *addr = __bitops_word(nr, ptr);
 	unsigned long mask = __bitops_mask(nr);
 	unsigned long old;

 	old = __atomic64_xor_barrier(mask, (long *)addr);
 	return old & mask;
 }

 static __always_inline void
 arch___set_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	unsigned long *p = __bitops_word(nr, addr);
 	unsigned long mask = __bitops_mask(nr);

 	*p |= mask;
 }

 static __always_inline void
 arch___clear_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	unsigned long *p = __bitops_word(nr, addr);
 	unsigned long mask = __bitops_mask(nr);

 	*p &= ~mask;
 }

 static __always_inline void
 arch___change_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	unsigned long *p = __bitops_word(nr, addr);
 	unsigned long mask = __bitops_mask(nr);

 	*p ^= mask;
 }

 static __always_inline bool
 arch___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	unsigned long *p = __bitops_word(nr, addr);
 	unsigned long mask = __bitops_mask(nr);
 	unsigned long old;

 	old = *p;
 	*p |= mask;
 	return old & mask;
 }

 static __always_inline bool
 arch___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	unsigned long *p = __bitops_word(nr, addr);
 	unsigned long mask = __bitops_mask(nr);
 	unsigned long old;

 	old = *p;
 	*p &= ~mask;
 	return old & mask;
 }

 static __always_inline bool
 arch___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	unsigned long *p = __bitops_word(nr, addr);
 	unsigned long mask = __bitops_mask(nr);
 	unsigned long old;

 	old = *p;
 	*p ^= mask;
 	return old & mask;
 }

 static __always_inline bool
 arch_test_bit(unsigned long nr, const volatile unsigned long *addr)
 {
 	const volatile unsigned long *p = __bitops_word(nr, addr);
 	unsigned long mask = __bitops_mask(nr);

 	return *p & mask;
 }

 static inline bool arch_test_and_set_bit_lock(unsigned long nr,
 					      volatile unsigned long *ptr)
 {
 	if (arch_test_bit(nr, ptr))
 		return true;
 	return arch_test_and_set_bit(nr, ptr);
 }

 static inline void arch_clear_bit_unlock(unsigned long nr,
 					 volatile unsigned long *ptr)
 {
 	smp_mb__before_atomic();
 	arch_clear_bit(nr, ptr);
 }

 static inline void arch___clear_bit_unlock(unsigned long nr,
 					   volatile unsigned long *ptr)
 {
 	smp_mb();
 	arch___clear_bit(nr, ptr);
 }

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

 /*
  * Functions which use MSB0 bit numbering.
  * The bits are numbered:
  *   |0..............63|64............127|128...........191|192...........255|
  */
 unsigned long find_first_bit_inv(const unsigned long *addr, unsigned long size);
 unsigned long find_next_bit_inv(const unsigned long *addr, unsigned long size,
 				unsigned long offset);

 #define for_each_set_bit_inv(bit, addr, size)				\
 	for ((bit) = find_first_bit_inv((addr), (size));		\
 	     (bit) < (size);						\
 	     (bit) = find_next_bit_inv((addr), (size), (bit) + 1))

 static inline void set_bit_inv(unsigned long nr, volatile unsigned long *ptr)
 {
 	return set_bit(nr ^ (BITS_PER_LONG - 1), ptr);
 }

 static inline void clear_bit_inv(unsigned long nr, volatile unsigned long *ptr)
 {
 	return clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
 }

 static inline bool test_and_clear_bit_inv(unsigned long nr,
 					  volatile unsigned long *ptr)
 {
 	return test_and_clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
 }

 static inline void __set_bit_inv(unsigned long nr, volatile unsigned long *ptr)
 {
 	return __set_bit(nr ^ (BITS_PER_LONG - 1), ptr);
 }

 static inline void __clear_bit_inv(unsigned long nr, volatile unsigned long *ptr)
 {
 	return __clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
 }

 static inline bool test_bit_inv(unsigned long nr,
 				const volatile unsigned long *ptr)
 {
 	return test_bit(nr ^ (BITS_PER_LONG - 1), ptr);
 }

 /**
  * __flogr - find leftmost one
  * @word - The word to search
  *
  * Returns the bit number of the most significant bit set,
  * where the most significant bit has bit number 0.
  * If no bit is set this function returns 64.
  */
 static inline unsigned char __flogr(unsigned long word)
 {
 	if (__builtin_constant_p(word)) {
 		unsigned long bit = 0;

 		if (!word)
 			return 64;
 		if (!(word & 0xffffffff00000000UL)) {
 			word <<= 32;
 			bit += 32;
 		}
 		if (!(word & 0xffff000000000000UL)) {
 			word <<= 16;
 			bit += 16;
 		}
 		if (!(word & 0xff00000000000000UL)) {
 			word <<= 8;
 			bit += 8;
 		}
 		if (!(word & 0xf000000000000000UL)) {
 			word <<= 4;
 			bit += 4;
 		}
 		if (!(word & 0xc000000000000000UL)) {
 			word <<= 2;
 			bit += 2;
 		}
 		if (!(word & 0x8000000000000000UL)) {
 			word <<= 1;
 			bit += 1;
 		}
 		return bit;
 	} else {
 		union register_pair rp;

 		rp.even = word;
 		asm volatile(
 			"       flogr   %[rp],%[rp]\n"
 			: [rp] "+d" (rp.pair) : : "cc");
 		return rp.even;
 	}
 }

 /**
  * __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 __flogr(-word & word) ^ (BITS_PER_LONG - 1);
 }

 /**
  * ffs - find first bit set
  * @word: the word to search
  *
  * This is defined the same way as the libc and
  * compiler builtin ffs routines (man ffs).
  */
 static inline int ffs(int word)
 {
 	unsigned long mask = 2 * BITS_PER_LONG - 1;
 	unsigned int val = (unsigned int)word;

 	return (1 + (__flogr(-val & val) ^ (BITS_PER_LONG - 1))) & mask;
 }

 /**
  * __fls - find last (most-significant) set bit in a long word
  * @word: the word to search
  *
  * Undefined if no set bit exists, so code should check against 0 first.
  */
 static inline unsigned long __fls(unsigned long word)
 {
 	return __flogr(word) ^ (BITS_PER_LONG - 1);
 }

 /**
  * fls64 - find last set bit in a 64-bit word
  * @word: the word to search
  *
  * This is defined in a similar way as the libc and compiler builtin
  * ffsll, but returns the position of the most significant set bit.
  *
  * fls64(value) returns 0 if value is 0 or the position of the last
  * set bit if value is nonzero. The last (most significant) bit is
  * at position 64.
  */
 static inline int fls64(unsigned long word)
 {
 	unsigned long mask = 2 * BITS_PER_LONG - 1;

 	return (1 + (__flogr(word) ^ (BITS_PER_LONG - 1))) & mask;
 }

 /**
  * fls - find last (most-significant) 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 word)
 {
 	return fls64(word);
 }

 #include <asm-generic/bitops/ffz.h>
 #include <asm-generic/bitops/hweight.h>
 #include <asm-generic/bitops/sched.h>
 #include <asm-generic/bitops/le.h>
 #include <asm-generic/bitops/ext2-atomic-setbit.h>

 #endif /* _S390_BITOPS_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	/*
	* Copyright IBM Corp. 1999,2013
	*
	* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
	*
	* The description below was taken in large parts from the powerpc
	* bitops header file:
	* Within a word, bits are numbered LSB first. Lot's of places make
	* this assumption by directly testing bits with (val & (1<<nr)).
	* This can cause confusion for large (> 1 word) bitmaps on a
	* big-endian system because, unlike little endian, the number of each
	* bit depends on the word size.
	*
	* The bitop functions are defined to work on unsigned longs, so the bits
	* end up numbered:
	* \|63..............0\|127............64\|191...........128\|255...........192\|
	*
	* We also have special functions which work with an MSB0 encoding.
	* The bits are numbered:
	* \|0..............63\|64............127\|128...........191\|192...........255\|
	*
	* The main difference is that bit 0-63 in the bit number field needs to be
	* reversed compared to the LSB0 encoded bit fields. This can be achieved by
	* XOR with 0x3f.
	*
	*/

	#ifndef _S390_BITOPS_H
	#define _S390_BITOPS_H

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

	#include <linux/typecheck.h>
	#include <linux/compiler.h>
	#include <linux/types.h>
	#include <asm/atomic_ops.h>
	#include <asm/barrier.h>

	#define __BITOPS_WORDS(bits) (((bits) + BITS_PER_LONG - 1) / BITS_PER_LONG)

	static inline unsigned long *
	__bitops_word(unsigned long nr, const volatile unsigned long *ptr)
	{
	unsigned long addr;

	addr = (unsigned long)ptr + ((nr ^ (nr & (BITS_PER_LONG - 1))) >> 3);
	return (unsigned long *)addr;
	}

	static inline unsigned long __bitops_mask(unsigned long nr)
	{
	return 1UL << (nr & (BITS_PER_LONG - 1));
	}

	static __always_inline void arch_set_bit(unsigned long nr, volatile unsigned long *ptr)
	{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);

	__atomic64_or(mask, (long *)addr);
	}

	static __always_inline void arch_clear_bit(unsigned long nr, volatile unsigned long *ptr)
	{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);

	__atomic64_and(~mask, (long *)addr);
	}

	static __always_inline void arch_change_bit(unsigned long nr,
	volatile unsigned long *ptr)
	{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);

	__atomic64_xor(mask, (long *)addr);
	}

	static inline bool arch_test_and_set_bit(unsigned long nr,
	volatile unsigned long *ptr)
	{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = __atomic64_or_barrier(mask, (long *)addr);
	return old & mask;
	}

	static inline bool arch_test_and_clear_bit(unsigned long nr,
	volatile unsigned long *ptr)
	{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = __atomic64_and_barrier(~mask, (long *)addr);
	return old & mask;
	}

	static inline bool arch_test_and_change_bit(unsigned long nr,
	volatile unsigned long *ptr)
	{
	unsigned long *addr = __bitops_word(nr, ptr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = __atomic64_xor_barrier(mask, (long *)addr);
	return old & mask;
	}

	static __always_inline void
	arch___set_bit(unsigned long nr, volatile unsigned long *addr)
	{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);

	*p \|= mask;
	}

	static __always_inline void
	arch___clear_bit(unsigned long nr, volatile unsigned long *addr)
	{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);

	*p &= ~mask;
	}

	static __always_inline void
	arch___change_bit(unsigned long nr, volatile unsigned long *addr)
	{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);

	*p ^= mask;
	}

	static __always_inline bool
	arch___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
	{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = *p;
	*p \|= mask;
	return old & mask;
	}

	static __always_inline bool
	arch___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
	{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = *p;
	*p &= ~mask;
	return old & mask;
	}

	static __always_inline bool
	arch___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
	{
	unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);
	unsigned long old;

	old = *p;
	*p ^= mask;
	return old & mask;
	}

	static __always_inline bool
	arch_test_bit(unsigned long nr, const volatile unsigned long *addr)
	{
	const volatile unsigned long *p = __bitops_word(nr, addr);
	unsigned long mask = __bitops_mask(nr);

	return *p & mask;
	}

	static inline bool arch_test_and_set_bit_lock(unsigned long nr,
	volatile unsigned long *ptr)
	{
	if (arch_test_bit(nr, ptr))
	return true;
	return arch_test_and_set_bit(nr, ptr);
	}

	static inline void arch_clear_bit_unlock(unsigned long nr,
	volatile unsigned long *ptr)
	{
	smp_mb__before_atomic();
	arch_clear_bit(nr, ptr);
	}

	static inline void arch___clear_bit_unlock(unsigned long nr,
	volatile unsigned long *ptr)
	{
	smp_mb();
	arch___clear_bit(nr, ptr);
	}

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

	/*
	* Functions which use MSB0 bit numbering.
	* The bits are numbered:
	* \|0..............63\|64............127\|128...........191\|192...........255\|
	*/
	unsigned long find_first_bit_inv(const unsigned long *addr, unsigned long size);
	unsigned long find_next_bit_inv(const unsigned long *addr, unsigned long size,
	unsigned long offset);

	#define for_each_set_bit_inv(bit, addr, size) \
	for ((bit) = find_first_bit_inv((addr), (size)); \
	(bit) < (size); \
	(bit) = find_next_bit_inv((addr), (size), (bit) + 1))

	static inline void set_bit_inv(unsigned long nr, volatile unsigned long *ptr)
	{
	return set_bit(nr ^ (BITS_PER_LONG - 1), ptr);
	}

	static inline void clear_bit_inv(unsigned long nr, volatile unsigned long *ptr)
	{
	return clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
	}

	static inline bool test_and_clear_bit_inv(unsigned long nr,
	volatile unsigned long *ptr)
	{
	return test_and_clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
	}

	static inline void __set_bit_inv(unsigned long nr, volatile unsigned long *ptr)
	{
	return __set_bit(nr ^ (BITS_PER_LONG - 1), ptr);
	}

	static inline void __clear_bit_inv(unsigned long nr, volatile unsigned long *ptr)
	{
	return __clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
	}

	static inline bool test_bit_inv(unsigned long nr,
	const volatile unsigned long *ptr)
	{
	return test_bit(nr ^ (BITS_PER_LONG - 1), ptr);
	}

	/**
	* __flogr - find leftmost one
	* @word - The word to search
	*
	* Returns the bit number of the most significant bit set,
	* where the most significant bit has bit number 0.
	* If no bit is set this function returns 64.
	*/
	static inline unsigned char __flogr(unsigned long word)
	{
	if (__builtin_constant_p(word)) {
	unsigned long bit = 0;

	if (!word)
	return 64;
	if (!(word & 0xffffffff00000000UL)) {
	word <<= 32;
	bit += 32;
	}
	if (!(word & 0xffff000000000000UL)) {
	word <<= 16;
	bit += 16;
	}
	if (!(word & 0xff00000000000000UL)) {
	word <<= 8;
	bit += 8;
	}
	if (!(word & 0xf000000000000000UL)) {
	word <<= 4;
	bit += 4;
	}
	if (!(word & 0xc000000000000000UL)) {
	word <<= 2;
	bit += 2;
	}
	if (!(word & 0x8000000000000000UL)) {
	word <<= 1;
	bit += 1;
	}
	return bit;
	} else {
	union register_pair rp;

	rp.even = word;
	asm volatile(
	" flogr %[rp],%[rp]\n"
	: [rp] "+d" (rp.pair) : : "cc");
	return rp.even;
	}
	}

	/**
	* __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 __flogr(-word & word) ^ (BITS_PER_LONG - 1);
	}

	/**
	* ffs - find first bit set
	* @word: the word to search
	*
	* This is defined the same way as the libc and
	* compiler builtin ffs routines (man ffs).
	*/
	static inline int ffs(int word)
	{
	unsigned long mask = 2 * BITS_PER_LONG - 1;
	unsigned int val = (unsigned int)word;

	return (1 + (__flogr(-val & val) ^ (BITS_PER_LONG - 1))) & mask;
	}

	/**
	* __fls - find last (most-significant) set bit in a long word
	* @word: the word to search
	*
	* Undefined if no set bit exists, so code should check against 0 first.
	*/
	static inline unsigned long __fls(unsigned long word)
	{
	return __flogr(word) ^ (BITS_PER_LONG - 1);
	}

	/**
	* fls64 - find last set bit in a 64-bit word
	* @word: the word to search
	*
	* This is defined in a similar way as the libc and compiler builtin
	* ffsll, but returns the position of the most significant set bit.
	*
	* fls64(value) returns 0 if value is 0 or the position of the last
	* set bit if value is nonzero. The last (most significant) bit is
	* at position 64.
	*/
	static inline int fls64(unsigned long word)
	{
	unsigned long mask = 2 * BITS_PER_LONG - 1;

	return (1 + (__flogr(word) ^ (BITS_PER_LONG - 1))) & mask;
	}

	/**
	* fls - find last (most-significant) 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 word)
	{
	return fls64(word);
	}

	#include <asm-generic/bitops/ffz.h>
	#include <asm-generic/bitops/hweight.h>
	#include <asm-generic/bitops/sched.h>
	#include <asm-generic/bitops/le.h>
	#include <asm-generic/bitops/ext2-atomic-setbit.h>

	#endif /* _S390_BITOPS_H */