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/*
 * include/asm-xtensa/bitops.h
 *
 * Atomic operations that C can't guarantee us.Useful for resource counting etc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2007 Tensilica Inc.
 */

#ifndef _XTENSA_BITOPS_H
#define _XTENSA_BITOPS_H

#ifdef __KERNEL__

#ifndef _LINUX_BITOPS_H
#error only <linux/bitops.h> can be included directly
#endif

#include <asm/processor.h>
#include <asm/byteorder.h>
#include <asm/barrier.h>

#include <asm-generic/bitops/non-atomic.h>

#if XCHAL_HAVE_NSA

static inline unsigned long __cntlz (unsigned long x)
{
	int lz;
	asm ("nsau %0, %1" : "=r" (lz) : "r" (x));
	return lz;
}

/*
 * ffz: Find first zero in word. Undefined if no zero exists.
 * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
 */

static inline int ffz(unsigned long x)
{
	return 31 - __cntlz(~x & -~x);
}

/*
 * __ffs: Find first bit set in word. Return 0 for bit 0
 */

static inline unsigned long __ffs(unsigned long x)
{
	return 31 - __cntlz(x & -x);
}

/*
 * ffs: Find first bit set in word. This is defined the same way as
 * the libc and compiler builtin ffs routines, therefore
 * differs in spirit from the above ffz (man ffs).
 */

static inline int ffs(unsigned long x)
{
	return 32 - __cntlz(x & -x);
}

/*
 * fls: Find last (most-significant) bit set in word.
 * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
 */

static inline int fls (unsigned int x)
{
	return 32 - __cntlz(x);
}

/**
 * __fls - find last (most-significant) set bit in a long word
 * @word: the word to search
 *
 * Undefined if no set bit exists, so code should check against 0 first.
 */
static inline unsigned long __fls(unsigned long word)
{
	return 31 - __cntlz(word);
}
#else

/* Use the generic implementation if we don't have the nsa/nsau instructions. */

# include <asm-generic/bitops/ffs.h>
# include <asm-generic/bitops/__ffs.h>
# include <asm-generic/bitops/ffz.h>
# include <asm-generic/bitops/fls.h>
# include <asm-generic/bitops/__fls.h>

#endif

#include <asm-generic/bitops/fls64.h>

#if XCHAL_HAVE_S32C1I

static inline void set_bit(unsigned int bit, volatile unsigned long *p)
{
	unsigned long tmp, value;
	unsigned long mask = 1UL << (bit & 31);

	p += bit >> 5;

	__asm__ __volatile__(
			"1:     l32i    %1, %3, 0\n"
			"       wsr     %1, scompare1\n"
			"       or      %0, %1, %2\n"
			"       s32c1i  %0, %3, 0\n"
			"       bne     %0, %1, 1b\n"
			: "=&a" (tmp), "=&a" (value)
			: "a" (mask), "a" (p)
			: "memory");
}

static inline void clear_bit(unsigned int bit, volatile unsigned long *p)
{
	unsigned long tmp, value;
	unsigned long mask = 1UL << (bit & 31);

	p += bit >> 5;

	__asm__ __volatile__(
			"1:     l32i    %1, %3, 0\n"
			"       wsr     %1, scompare1\n"
			"       and     %0, %1, %2\n"
			"       s32c1i  %0, %3, 0\n"
			"       bne     %0, %1, 1b\n"
			: "=&a" (tmp), "=&a" (value)
			: "a" (~mask), "a" (p)
			: "memory");
}

static inline void change_bit(unsigned int bit, volatile unsigned long *p)
{
	unsigned long tmp, value;
	unsigned long mask = 1UL << (bit & 31);

	p += bit >> 5;

	__asm__ __volatile__(
			"1:     l32i    %1, %3, 0\n"
			"       wsr     %1, scompare1\n"
			"       xor     %0, %1, %2\n"
			"       s32c1i  %0, %3, 0\n"
			"       bne     %0, %1, 1b\n"
			: "=&a" (tmp), "=&a" (value)
			: "a" (mask), "a" (p)
			: "memory");
}

static inline int
test_and_set_bit(unsigned int bit, volatile unsigned long *p)
{
	unsigned long tmp, value;
	unsigned long mask = 1UL << (bit & 31);

	p += bit >> 5;

	__asm__ __volatile__(
			"1:     l32i    %1, %3, 0\n"
			"       wsr     %1, scompare1\n"
			"       or      %0, %1, %2\n"
			"       s32c1i  %0, %3, 0\n"
			"       bne     %0, %1, 1b\n"
			: "=&a" (tmp), "=&a" (value)
			: "a" (mask), "a" (p)
			: "memory");

	return tmp & mask;
}

static inline int
test_and_clear_bit(unsigned int bit, volatile unsigned long *p)
{
	unsigned long tmp, value;
	unsigned long mask = 1UL << (bit & 31);

	p += bit >> 5;

	__asm__ __volatile__(
			"1:     l32i    %1, %3, 0\n"
			"       wsr     %1, scompare1\n"
			"       and     %0, %1, %2\n"
			"       s32c1i  %0, %3, 0\n"
			"       bne     %0, %1, 1b\n"
			: "=&a" (tmp), "=&a" (value)
			: "a" (~mask), "a" (p)
			: "memory");

	return tmp & mask;
}

static inline int
test_and_change_bit(unsigned int bit, volatile unsigned long *p)
{
	unsigned long tmp, value;
	unsigned long mask = 1UL << (bit & 31);

	p += bit >> 5;

	__asm__ __volatile__(
			"1:     l32i    %1, %3, 0\n"
			"       wsr     %1, scompare1\n"
			"       xor     %0, %1, %2\n"
			"       s32c1i  %0, %3, 0\n"
			"       bne     %0, %1, 1b\n"
			: "=&a" (tmp), "=&a" (value)
			: "a" (mask), "a" (p)
			: "memory");

	return tmp & mask;
}

#else

#include <asm-generic/bitops/atomic.h>

#endif /* XCHAL_HAVE_S32C1I */

#include <asm-generic/bitops/find.h>
#include <asm-generic/bitops/le.h>

#include <asm-generic/bitops/ext2-atomic-setbit.h>

#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/lock.h>
#include <asm-generic/bitops/sched.h>

#endif	/* __KERNEL__ */

#endif	/* _XTENSA_BITOPS_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 685 B 0644
asm-offsets.h File 35 B 0644
asm-uaccess.h File 4.11 KB 0644
asmmacro.h File 2.76 KB 0644
atomic.h File 7.38 KB 0644
barrier.h File 542 B 0644
bitops.h File 5.08 KB 0644
bootparam.h File 1.37 KB 0644
bugs.h File 451 B 0644
cache.h File 969 B 0644
cacheasm.h File 3.77 KB 0644
cacheflush.h File 5.76 KB 0644
checksum.h File 6 KB 0644
cmpxchg.h File 3.9 KB 0644
coprocessor.h File 5.05 KB 0644
current.h File 675 B 0644
delay.h File 1.63 KB 0644
dma-mapping.h File 855 B 0644
dma.h File 1.79 KB 0644
elf.h File 5.75 KB 0644
fixmap.h File 2.5 KB 0644
flat.h File 686 B 0644
ftrace.h File 979 B 0644
futex.h File 2.59 KB 0644
highmem.h File 2.33 KB 0644
hw_breakpoint.h File 1.45 KB 0644
hw_irq.h File 320 B 0644
initialize_mmu.h File 4.58 KB 0644
io.h File 2.09 KB 0644
irq.h File 1.46 KB 0644
irqflags.h File 1.99 KB 0644
kmem_layout.h File 2.07 KB 0644
mmu.h File 462 B 0644
mmu_context.h File 3.62 KB 0644
module.h File 525 B 0644
mxregs.h File 1.3 KB 0644
nommu_context.h File 602 B 0644
page.h File 5.69 KB 0644
pci-bridge.h File 2.16 KB 0644
pci.h File 1.37 KB 0644
perf_event.h File 108 B 0644
pgalloc.h File 1.84 KB 0644
pgtable.h File 14.89 KB 0644
platform.h File 1.75 KB 0644
processor.h File 7.44 KB 0644
ptrace.h File 3.74 KB 0644
regs.h File 3.87 KB 0644
segment.h File 376 B 0644
serial.h File 443 B 0644
shmparam.h File 561 B 0644
signal.h File 502 B 0644
smp.h File 967 B 0644
spinlock.h File 4.6 KB 0644
spinlock_types.h File 412 B 0644
stacktrace.h File 1.13 KB 0644
string.h File 2.65 KB 0644
switch_to.h File 601 B 0644
syscall.h File 982 B 0644
sysmem.h File 426 B 0644
thread_info.h File 3.62 KB 0644
timex.h File 1.79 KB 0644
tlb.h File 1.1 KB 0644
tlbflush.h File 5.53 KB 0644
traps.h File 1.87 KB 0644
types.h File 501 B 0644
uaccess.h File 8.67 KB 0644
ucontext.h File 540 B 0644
unaligned.h File 864 B 0644
unistd.h File 639 B 0644
user.h File 507 B 0644
vectors.h File 4.05 KB 0644
vga.h File 434 B 0644