[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / asm-cris / arch-v32 / bitops.h

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