[deliverable/linux.git] / arch / powerpc / include / asm / word-at-a-time.h

#ifndef _ASM_WORD_AT_A_TIME_H
#define _ASM_WORD_AT_A_TIME_H

/*
 * Word-at-a-time interfaces for PowerPC.
 */

#include <linux/kernel.h>
#include <asm/asm-compat.h>

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

#define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0xfe) + 1, REPEAT_BYTE(0x7f) }

/* Bit set in the bytes that have a zero */
static inline long prep_zero_mask(unsigned long val, unsigned long rhs, const struct word_at_a_time *c)
{
	unsigned long mask = (val & c->low_bits) + c->low_bits;
	return ~(mask | rhs);
}

#define create_zero_mask(mask) (mask)

static inline long find_zero(unsigned long mask)
{
	long leading_zero_bits;

	asm (PPC_CNTLZL "%0,%1" : "=r" (leading_zero_bits) : "r" (mask));
	return leading_zero_bits >> 3;
}

static inline bool has_zero(unsigned long val, unsigned long *data, const struct word_at_a_time *c)
{
	unsigned long rhs = val | c->low_bits;
	*data = rhs;
	return (val + c->high_bits) & ~rhs;
}

#endif /* _ASM_WORD_AT_A_TIME_H */
Commit	Line	Data
1629372c PM	1	#ifndef _ASM_WORD_AT_A_TIME_H
	2	#define _ASM_WORD_AT_A_TIME_H
	3
	4	/*
	5	* Word-at-a-time interfaces for PowerPC.
	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <asm/asm-compat.h>
	10
	11	struct word_at_a_time {
	12	const unsigned long high_bits, low_bits;
	13	};
	14
	15	#define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0xfe) + 1, REPEAT_BYTE(0x7f) }
	16
	17	/* Bit set in the bytes that have a zero */
	18	static inline long prep_zero_mask(unsigned long val, unsigned long rhs, const struct word_at_a_time *c)
	19	{
	20	unsigned long mask = (val & c->low_bits) + c->low_bits;
	21	return ~(mask \| rhs);
	22	}
	23
	24	#define create_zero_mask(mask) (mask)
	25
	26	static inline long find_zero(unsigned long mask)
	27	{
	28	long leading_zero_bits;
	29
	30	asm (PPC_CNTLZL "%0,%1" : "=r" (leading_zero_bits) : "r" (mask));
	31	return leading_zero_bits >> 3;
	32	}
	33
	34	static inline bool has_zero(unsigned long val, unsigned long data, const struct word_at_a_time c)
	35	{
	36	unsigned long rhs = val \| c->low_bits;
	37	*data = rhs;
	38	return (val + c->high_bits) & ~rhs;
	39	}
	40
	41	#endif /* _ASM_WORD_AT_A_TIME_H */