[mirror_ubuntu-jammy-kernel.git] / arch / riscv / include / asm / word-at-a-time.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 Regents of the University of California
 *
 * Derived from arch/x86/include/asm/word-at-a-time.h
 */

#ifndef _ASM_RISCV_WORD_AT_A_TIME_H
#define _ASM_RISCV_WORD_AT_A_TIME_H


#include <linux/kernel.h>

struct word_at_a_time {
	const unsigned long one_bits, high_bits;
};

#define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) }

static inline unsigned long has_zero(unsigned long val,
	unsigned long *bits, const struct word_at_a_time *c)
{
	unsigned long mask = ((val - c->one_bits) & ~val) & c->high_bits;
	*bits = mask;
	return mask;
}

static inline unsigned long prep_zero_mask(unsigned long val,
	unsigned long bits, const struct word_at_a_time *c)
{
	return bits;
}

static inline unsigned long create_zero_mask(unsigned long bits)
{
	bits = (bits - 1) & ~bits;
	return bits >> 7;
}

static inline unsigned long find_zero(unsigned long mask)
{
	return fls64(mask) >> 3;
}

/* The mask we created is directly usable as a bytemask */
#define zero_bytemask(mask) (mask)

#endif /* _ASM_RISCV_WORD_AT_A_TIME_H */
Commit	Line	Data
50acfb2b	1	/* SPDX-License-Identifier: GPL-2.0-only */
5d8544e2 PD	2	/*
	3	* Copyright (C) 2012 Regents of the University of California
	4	*
5d8544e2 PD	5	* Derived from arch/x86/include/asm/word-at-a-time.h
	6	*/
	7
	8	#ifndef _ASM_RISCV_WORD_AT_A_TIME_H
	9	#define _ASM_RISCV_WORD_AT_A_TIME_H
	10
	11
	12	#include <linux/kernel.h>
	13
	14	struct word_at_a_time {
	15	const unsigned long one_bits, high_bits;
	16	};
	17
	18	#define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) }
	19
	20	static inline unsigned long has_zero(unsigned long val,
	21	unsigned long bits, const struct word_at_a_time c)
	22	{
	23	unsigned long mask = ((val - c->one_bits) & ~val) & c->high_bits;
	24	*bits = mask;
	25	return mask;
	26	}
	27
	28	static inline unsigned long prep_zero_mask(unsigned long val,
	29	unsigned long bits, const struct word_at_a_time *c)
	30	{
	31	return bits;
	32	}
	33
	34	static inline unsigned long create_zero_mask(unsigned long bits)
	35	{
	36	bits = (bits - 1) & ~bits;
	37	return bits >> 7;
	38	}
	39
	40	static inline unsigned long find_zero(unsigned long mask)
	41	{
	42	return fls64(mask) >> 3;
	43	}
	44
	45	/* The mask we created is directly usable as a bytemask */
	46	#define zero_bytemask(mask) (mask)
	47
	48	#endif /* _ASM_RISCV_WORD_AT_A_TIME_H */