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/* 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 */

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hwregs Folder 0755
bitops.h File 1.29 KB 0644
bug.h File 1008 B 0644
cache.h File 601 B 0644
checksum.h File 807 B 0644
cryptocop.h File 4.25 KB 0644
delay.h File 649 B 0644
dma.h File 22 B 0644
intmem.h File 339 B 0644
irq.h File 3.55 KB 0644
irqflags.h File 1 KB 0644
memmap.h File 25 B 0644
mmu.h File 4.07 KB 0644
offset.h File 1.29 KB 0644
page.h File 660 B 0644
pgtable.h File 483 B 0644
processor.h File 1.52 KB 0644
swab.h File 517 B 0644
system.h File 803 B 0644
thread_info.h File 363 B 0644
timex.h File 852 B 0644
tlb.h File 453 B 0644
uaccess.h File 18.38 KB 0644
unistd.h File 4.58 KB 0644