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/*
 * Copyright (C) 2012 Regents of the University of California
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 */

#ifndef _ASM_RISCV_BITOPS_H
#define _ASM_RISCV_BITOPS_H

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

#include <linux/compiler.h>
#include <linux/irqflags.h>
#include <asm/barrier.h>
#include <asm/bitsperlong.h>

#ifndef smp_mb__before_clear_bit
#define smp_mb__before_clear_bit()  smp_mb()
#define smp_mb__after_clear_bit()   smp_mb()
#endif /* smp_mb__before_clear_bit */

#include <asm-generic/bitops/__ffs.h>
#include <asm-generic/bitops/ffz.h>
#include <asm-generic/bitops/fls.h>
#include <asm-generic/bitops/__fls.h>
#include <asm-generic/bitops/fls64.h>
#include <asm-generic/bitops/find.h>
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/ffs.h>

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

#if (BITS_PER_LONG == 64)
#define __AMO(op)	"amo" #op ".d"
#elif (BITS_PER_LONG == 32)
#define __AMO(op)	"amo" #op ".w"
#else
#error "Unexpected BITS_PER_LONG"
#endif

#define __test_and_op_bit_ord(op, mod, nr, addr, ord)		\
({								\
	unsigned long __res, __mask;				\
	__mask = BIT_MASK(nr);					\
	__asm__ __volatile__ (					\
		__AMO(op) #ord " %0, %2, %1"			\
		: "=r" (__res), "+A" (addr[BIT_WORD(nr)])	\
		: "r" (mod(__mask))				\
		: "memory");					\
	((__res & __mask) != 0);				\
})

#define __op_bit_ord(op, mod, nr, addr, ord)			\
	__asm__ __volatile__ (					\
		__AMO(op) #ord " zero, %1, %0"			\
		: "+A" (addr[BIT_WORD(nr)])			\
		: "r" (mod(BIT_MASK(nr)))			\
		: "memory");

#define __test_and_op_bit(op, mod, nr, addr) 			\
	__test_and_op_bit_ord(op, mod, nr, addr, .aqrl)
#define __op_bit(op, mod, nr, addr)				\
	__op_bit_ord(op, mod, nr, addr, )

/* Bitmask modifiers */
#define __NOP(x)	(x)
#define __NOT(x)	(~(x))

/**
 * test_and_set_bit - Set a bit and return its old value
 * @nr: Bit to set
 * @addr: Address to count from
 *
 * This operation may be reordered on other architectures than x86.
 */
static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
{
	return __test_and_op_bit(or, __NOP, nr, addr);
}

/**
 * test_and_clear_bit - Clear a bit and return its old value
 * @nr: Bit to clear
 * @addr: Address to count from
 *
 * This operation can be reordered on other architectures other than x86.
 */
static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
{
	return __test_and_op_bit(and, __NOT, nr, addr);
}

/**
 * test_and_change_bit - Change a bit and return its old value
 * @nr: Bit to change
 * @addr: Address to count from
 *
 * This operation is atomic and cannot be reordered.
 * It also implies a memory barrier.
 */
static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
{
	return __test_and_op_bit(xor, __NOP, nr, addr);
}

/**
 * set_bit - Atomically set a bit in memory
 * @nr: the bit to set
 * @addr: the address to start counting from
 *
 * Note: there are no guarantees that this function will not be reordered
 * on non x86 architectures, so if you are writing portable code,
 * make sure not to rely on its reordering guarantees.
 *
 * Note that @nr may be almost arbitrarily large; this function is not
 * restricted to acting on a single-word quantity.
 */
static inline void set_bit(int nr, volatile unsigned long *addr)
{
	__op_bit(or, __NOP, nr, addr);
}

/**
 * clear_bit - Clears a bit in memory
 * @nr: Bit to clear
 * @addr: Address to start counting from
 *
 * Note: there are no guarantees that this function will not be reordered
 * on non x86 architectures, so if you are writing portable code,
 * make sure not to rely on its reordering guarantees.
 */
static inline void clear_bit(int nr, volatile unsigned long *addr)
{
	__op_bit(and, __NOT, nr, addr);
}

/**
 * change_bit - Toggle a bit in memory
 * @nr: Bit to change
 * @addr: Address to start counting from
 *
 * change_bit()  may be reordered on other architectures than x86.
 * Note that @nr may be almost arbitrarily large; this function is not
 * restricted to acting on a single-word quantity.
 */
static inline void change_bit(int nr, volatile unsigned long *addr)
{
	__op_bit(xor, __NOP, nr, addr);
}

/**
 * test_and_set_bit_lock - Set a bit and return its old value, for lock
 * @nr: Bit to set
 * @addr: Address to count from
 *
 * This operation is atomic and provides acquire barrier semantics.
 * It can be used to implement bit locks.
 */
static inline int test_and_set_bit_lock(
	unsigned long nr, volatile unsigned long *addr)
{
	return __test_and_op_bit_ord(or, __NOP, nr, addr, .aq);
}

/**
 * clear_bit_unlock - Clear a bit in memory, for unlock
 * @nr: the bit to set
 * @addr: the address to start counting from
 *
 * This operation is atomic and provides release barrier semantics.
 */
static inline void clear_bit_unlock(
	unsigned long nr, volatile unsigned long *addr)
{
	__op_bit_ord(and, __NOT, nr, addr, .rl);
}

/**
 * __clear_bit_unlock - Clear a bit in memory, for unlock
 * @nr: the bit to set
 * @addr: the address to start counting from
 *
 * This operation is like clear_bit_unlock, however it is not atomic.
 * It does provide release barrier semantics so it can be used to unlock
 * a bit lock, however it would only be used if no other CPU can modify
 * any bits in the memory until the lock is released (a good example is
 * if the bit lock itself protects access to the other bits in the word).
 *
 * On RISC-V systems there seems to be no benefit to taking advantage of the
 * non-atomic property here: it's a lot more instructions and we still have to
 * provide release semantics anyway.
 */
static inline void __clear_bit_unlock(
	unsigned long nr, volatile unsigned long *addr)
{
	clear_bit_unlock(nr, addr);
}

#undef __test_and_op_bit
#undef __op_bit
#undef __NOP
#undef __NOT
#undef __AMO

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

#endif /* _ASM_RISCV_BITOPS_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 1.37 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 176 B 0644
asm.h File 1.78 KB 0644
atomic.h File 11.31 KB 0644
barrier.h File 2.59 KB 0644
bitops.h File 6.23 KB 0644
bug.h File 2.12 KB 0644
cache.h File 745 B 0644
cacheflush.h File 1.7 KB 0644
cmpxchg.h File 3.35 KB 0644
compat.h File 924 B 0644
csr.h File 3.8 KB 0644
current.h File 1.27 KB 0644
delay.h File 881 B 0644
dma-mapping.h File 1.19 KB 0644
elf.h File 2.3 KB 0644
fence.h File 279 B 0644
hwcap.h File 1013 B 0644
io.h File 11.81 KB 0644
irq.h File 841 B 0644
irqflags.h File 1.54 KB 0644
kprobes.h File 679 B 0644
linkage.h File 677 B 0644
mmu.h File 829 B 0644
mmu_context.h File 3.14 KB 0644
page.h File 3.76 KB 0644
pci.h File 1.16 KB 0644
pgalloc.h File 3.06 KB 0644
pgtable-32.h File 870 B 0644
pgtable-64.h File 2.08 KB 0644
pgtable-bits.h File 1.81 KB 0644
pgtable.h File 11.17 KB 0644
processor.h File 2.44 KB 0644
ptrace.h File 2.69 KB 0644
sbi.h File 2.6 KB 0644
smp.h File 1.59 KB 0644
spinlock.h File 2.85 KB 0644
spinlock_types.h File 906 B 0644
string.h File 838 B 0644
switch_to.h File 1.86 KB 0644
syscall.h File 2.59 KB 0644
thread_info.h File 3.11 KB 0644
timex.h File 1.29 KB 0644
tlb.h File 717 B 0644
tlbflush.h File 1.83 KB 0644
uaccess.h File 14 KB 0644
unistd.h File 638 B 0644
vdso.h File 1.49 KB 0644
word-at-a-time.h File 1.48 KB 0644