[linux-2.6-block.git] / arch / cris / include / arch-v32 / arch / bitops.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_CRIS_ARCH_BITOPS_H
#define _ASM_CRIS_ARCH_BITOPS_H

/*
 * Helper functions for the core of the ff[sz] functions. They compute the
 * number of leading zeroes of a bits-in-byte, byte-in-word and
 * word-in-dword-swapped number. They differ in that the first function also
 * inverts all bits in the input.
 */

static inline unsigned long
cris_swapnwbrlz(unsigned long w)
{
	unsigned long res;

	__asm__ __volatile__ ("swapnwbr %0\n\t"
			      "lz %0,%0"
			      : "=r" (res) : "0" (w));

	return res;
}

static inline unsigned long
cris_swapwbrlz(unsigned long w)
{
	unsigned long res;

	__asm__ __volatile__ ("swapwbr %0\n\t"
			      "lz %0,%0"
			      : "=r" (res) : "0" (w));

	return res;
}

/*
 * Find First Zero in word. Undefined if no zero exist, so the caller should
 * check against ~0 first.
 */
static inline unsigned long
ffz(unsigned long w)
{
	return cris_swapnwbrlz(w);
}

/*
 * Find First Set bit in word. Undefined if no 1 exist, so the caller
 * should check against 0 first.
 */
static inline unsigned long
__ffs(unsigned long w)
{
	return cris_swapnwbrlz(~w);
}

/*
 * Find First Bit that is set.
 */
static inline unsigned long
kernel_ffs(unsigned long w)
{
	return w ? cris_swapwbrlz (w) + 1 : 0;
}

#endif /* _ASM_CRIS_ARCH_BITOPS_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
51533b61 MS	2	#ifndef _ASM_CRIS_ARCH_BITOPS_H
	3	#define _ASM_CRIS_ARCH_BITOPS_H
	4
	5	/*
	6	* Helper functions for the core of the ff[sz] functions. They compute the
	7	* number of leading zeroes of a bits-in-byte, byte-in-word and
	8	* word-in-dword-swapped number. They differ in that the first function also
	9	* inverts all bits in the input.
	10	*/
	11
d9b5444e	12	static inline unsigned long
51533b61 MS	13	cris_swapnwbrlz(unsigned long w)
	14	{
	15	unsigned long res;
	16
	17	__asm__ __volatile__ ("swapnwbr %0\n\t"
	18	"lz %0,%0"
	19	: "=r" (res) : "0" (w));
	20
	21	return res;
	22	}
	23
d9b5444e	24	static inline unsigned long
51533b61 MS	25	cris_swapwbrlz(unsigned long w)
	26	{
	27	unsigned long res;
	28
	29	__asm__ __volatile__ ("swapwbr %0\n\t"
	30	"lz %0,%0"
	31	: "=r" (res) : "0" (w));
	32
	33	return res;
	34	}
	35
	36	/*
	37	* Find First Zero in word. Undefined if no zero exist, so the caller should
	38	* check against ~0 first.
	39	*/
d9b5444e	40	static inline unsigned long
51533b61 MS	41	ffz(unsigned long w)
	42	{
	43	return cris_swapnwbrlz(w);
	44	}
	45
	46	/*
	47	* Find First Set bit in word. Undefined if no 1 exist, so the caller
	48	* should check against 0 first.
	49	*/
d9b5444e	50	static inline unsigned long
51533b61 MS	51	__ffs(unsigned long w)
	52	{
	53	return cris_swapnwbrlz(~w);
	54	}
	55
	56	/*
	57	* Find First Bit that is set.
	58	*/
d9b5444e	59	static inline unsigned long
51533b61 MS	60	kernel_ffs(unsigned long w)
	61	{
	62	return w ? cris_swapwbrlz (w) + 1 : 0;
	63	}
	64
	65	#endif /* _ASM_CRIS_ARCH_BITOPS_H */