Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* asm/bitops.h for Linux/CRIS

 *

 * TODO: asm versions if speed is needed

 *

 * 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).

 */

#ifndef _CRIS_BITOPS_H

#define _CRIS_BITOPS_H

/* Currently this is unsuitable for consumption outside the kernel.  */

#ifdef __KERNEL__ 

#ifndef _LINUX_BITOPS_H

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

#endif

#include <asm/arch/bitops.h>

#include <asm/system.h>

#include <asm/atomic.h>

#include <linux/compiler.h>

/*

 * Some hacks to defeat gcc over-optimizations..

 */

struct __dummy { unsigned long a[100]; };

#define ADDR (*(struct __dummy *) addr)

#define CONST_ADDR (*(const struct __dummy *) addr)

/*

 * 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.

 */

#define set_bit(nr, addr)    (void)test_and_set_bit(nr, addr)

/*

 * 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.

 */

#define clear_bit(nr, addr)  (void)test_and_clear_bit(nr, addr)

/*

 * change_bit - Toggle a bit in memory

 * @nr: Bit to change

 * @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.

 */

#define change_bit(nr, addr) (void)test_and_change_bit(nr, addr)

/**

 * 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 unsigned long *addr)

{

        unsigned int mask, retval;

        unsigned long flags;

        unsigned int *adr = (unsigned int *)addr;

        adr += nr >> 5;

        mask = 1 << (nr & 0x1f);

        cris_atomic_save(addr, flags);

        retval = (mask & *adr) != 0;

        *adr |= mask;

        cris_atomic_restore(addr, flags);

        return retval;

}

/*

 * clear_bit() doesn't provide any barrier for the compiler.

 */

#define smp_mb__before_clear_bit()      barrier()

#define smp_mb__after_clear_bit()       barrier()

/**

 * test_and_clear_bit - Clear a bit and return its old value

 * @nr: Bit to clear

 * @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 unsigned long *addr)

{

        unsigned int mask, retval;

        unsigned long flags;

        unsigned int *adr = (unsigned int *)addr;

        adr += nr >> 5;

        mask = 1 << (nr & 0x1f);

        cris_atomic_save(addr, flags);

        retval = (mask & *adr) != 0;

        *adr &= ~mask;

        cris_atomic_restore(addr, flags);

        return retval;

}

/**

 * 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)

{

        unsigned int mask, retval;

        unsigned long flags;

        unsigned int *adr = (unsigned int *)addr;

        adr += nr >> 5;

        mask = 1 << (nr & 0x1f);

        cris_atomic_save(addr, flags);

        retval = (mask & *adr) != 0;

        *adr ^= mask;

        cris_atomic_restore(addr, flags);

        return retval;

}

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

/*

 * Since we define it "external", it collides with the built-in

 * definition, which doesn't have the same semantics.  We don't want to

 * use -fno-builtin, so just hide the name ffs.

 */

#define ffs kernel_ffs

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

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

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

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

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

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

#define ext2_set_bit_atomic(l,n,a)   test_and_set_bit(n,a)

#define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a)

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

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

#endif /* __KERNEL__ */

#endif /* _CRIS_BITOPS_H */