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DEFINITIONS
This source file includes following definitions.
- set_bit
- clear_bit
- change_bit
- test_and_set_bit
- test_and_clear_bit
- test_and_change_bit
#ifndef _ASM_M32R_BITOPS_H
#define _ASM_M32R_BITOPS_H
/*
* linux/include/asm-m32r/bitops.h
*
* Copyright 1992, Linus Torvalds.
*
* M32R version:
* Copyright (C) 2001, 2002 Hitoshi Yamamoto
* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
*/
#ifndef _LINUX_BITOPS_H
#error only <linux/bitops.h> can be included directly
#endif
#include <linux/compiler.h>
#include <asm/assembler.h>
#include <asm/system.h>
#include <asm/byteorder.h>
#include <asm/types.h>
/*
* These have to be done with inline assembly: that way the bit-setting
* is guaranteed to be atomic. All bit operations return 0 if the bit
* was cleared before the operation and != 0 if it was not.
*
* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
*/
/**
* set_bit - Atomically set a bit in memory
* @nr: the bit to set
* @addr: the address to start counting from
*
* This function is atomic and may not be reordered. See __set_bit()
* if you do not require the atomic 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 void * addr)
{
__u32 mask;
volatile __u32 *a = addr;
unsigned long flags;
unsigned long tmp;
a += (nr >> 5);
mask = (1 << (nr & 0x1F));
local_irq_save(flags);
__asm__ __volatile__ (
DCACHE_CLEAR("%0", "r6", "%1")
M32R_LOCK" %0, @%1; \n\t"
"or %0, %2; \n\t"
M32R_UNLOCK" %0, @%1; \n\t"
: "=&r" (tmp)
: "r" (a), "r" (mask)
: "memory"
#ifdef CONFIG_CHIP_M32700_TS1
, "r6"
#endif /* CONFIG_CHIP_M32700_TS1 */
);
local_irq_restore(flags);
}
/**
* clear_bit - Clears a bit in memory
* @nr: Bit to clear
* @addr: Address to start counting from
*
* clear_bit() is atomic and may not be reordered. However, it does
* not contain a memory barrier, so if it is used for locking purposes,
* you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
* in order to ensure changes are visible on other processors.
*/
static __inline__ void clear_bit(int nr, volatile void * addr)
{
__u32 mask;
volatile __u32 *a = addr;
unsigned long flags;
unsigned long tmp;
a += (nr >> 5);
mask = (1 << (nr & 0x1F));
local_irq_save(flags);
__asm__ __volatile__ (
DCACHE_CLEAR("%0", "r6", "%1")
M32R_LOCK" %0, @%1; \n\t"
"and %0, %2; \n\t"
M32R_UNLOCK" %0, @%1; \n\t"
: "=&r" (tmp)
: "r" (a), "r" (~mask)
: "memory"
#ifdef CONFIG_CHIP_M32700_TS1
, "r6"
#endif /* CONFIG_CHIP_M32700_TS1 */
);
local_irq_restore(flags);
}
#define smp_mb__before_clear_bit() barrier()
#define smp_mb__after_clear_bit() barrier()
/**
* change_bit - Toggle a bit in memory
* @nr: Bit to clear
* @addr: Address to start counting from
*
* change_bit() is atomic and may not be reordered.
* 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 void * addr)
{
__u32 mask;
volatile __u32 *a = addr;
unsigned long flags;
unsigned long tmp;
a += (nr >> 5);
mask = (1 << (nr & 0x1F));
local_irq_save(flags);
__asm__ __volatile__ (
DCACHE_CLEAR("%0", "r6", "%1")
M32R_LOCK" %0, @%1; \n\t"
"xor %0, %2; \n\t"
M32R_UNLOCK" %0, @%1; \n\t"
: "=&r" (tmp)
: "r" (a), "r" (mask)
: "memory"
#ifdef CONFIG_CHIP_M32700_TS1
, "r6"
#endif /* CONFIG_CHIP_M32700_TS1 */
);
local_irq_restore(flags);
}
/**
* test_and_set_bit - Set a bit and return its old value
* @nr: Bit to set
* @addr: Address to count from
*
* This operation is atomic and cannot be reordered.
* It also implies a memory barrier.
*/
static __inline__ int test_and_set_bit(int nr, volatile void * addr)
{
__u32 mask, oldbit;
volatile __u32 *a = addr;
unsigned long flags;
unsigned long tmp;
a += (nr >> 5);
mask = (1 << (nr & 0x1F));
local_irq_save(flags);
__asm__ __volatile__ (
DCACHE_CLEAR("%0", "%1", "%2")
M32R_LOCK" %0, @%2; \n\t"
"mv %1, %0; \n\t"
"and %0, %3; \n\t"
"or %1, %3; \n\t"
M32R_UNLOCK" %1, @%2; \n\t"
: "=&r" (oldbit), "=&r" (tmp)
: "r" (a), "r" (mask)
: "memory"
);
local_irq_restore(flags);
return (oldbit != 0);
}
/**
* test_and_clear_bit - Clear a bit and return its old value
* @nr: Bit to set
* @addr: Address to count from
*
* This operation is atomic and cannot be reordered.
* It also implies a memory barrier.
*/
static __inline__ int test_and_clear_bit(int nr, volatile void * addr)
{
__u32 mask, oldbit;
volatile __u32 *a = addr;
unsigned long flags;
unsigned long tmp;
a += (nr >> 5);
mask = (1 << (nr & 0x1F));
local_irq_save(flags);
__asm__ __volatile__ (
DCACHE_CLEAR("%0", "%1", "%3")
M32R_LOCK" %0, @%3; \n\t"
"mv %1, %0; \n\t"
"and %0, %2; \n\t"
"not %2, %2; \n\t"
"and %1, %2; \n\t"
M32R_UNLOCK" %1, @%3; \n\t"
: "=&r" (oldbit), "=&r" (tmp), "+r" (mask)
: "r" (a)
: "memory"
);
local_irq_restore(flags);
return (oldbit != 0);
}
/**
* test_and_change_bit - Change a bit and return its old value
* @nr: Bit to set
* @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 void * addr)
{
__u32 mask, oldbit;
volatile __u32 *a = addr;
unsigned long flags;
unsigned long tmp;
a += (nr >> 5);
mask = (1 << (nr & 0x1F));
local_irq_save(flags);
__asm__ __volatile__ (
DCACHE_CLEAR("%0", "%1", "%2")
M32R_LOCK" %0, @%2; \n\t"
"mv %1, %0; \n\t"
"and %0, %3; \n\t"
"xor %1, %3; \n\t"
M32R_UNLOCK" %1, @%2; \n\t"
: "=&r" (oldbit), "=&r" (tmp)
: "r" (a), "r" (mask)
: "memory"
);
local_irq_restore(flags);
return (oldbit != 0);
}
#include <asm-generic/bitops/non-atomic.h>
#include <asm-generic/bitops/ffz.h>
#include <asm-generic/bitops/__ffs.h>
#include <asm-generic/bitops/fls.h>
#include <asm-generic/bitops/fls64.h>
#ifdef __KERNEL__
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/find.h>
#include <asm-generic/bitops/ffs.h>
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/lock.h>
#endif /* __KERNEL__ */
#ifdef __KERNEL__
#include <asm-generic/bitops/ext2-non-atomic.h>
#include <asm-generic/bitops/ext2-atomic.h>
#include <asm-generic/bitops/minix.h>
#endif /* __KERNEL__ */
#endif /* _ASM_M32R_BITOPS_H */