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#ifndef __ASM_SH64_SMPLOCK_H

#define __ASM_SH64_SMPLOCK_H

/*

 * 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.

 *

 * include/asm-sh64/smplock.h

 *

 * Copyright (C) 2000, 2001  Paolo Alberelli

 *

 */

#include <linux/config.h>

#ifndef CONFIG_SMP

#define lock_kernel()                           do { } while(0)

#define unlock_kernel()                         do { } while(0)

#define release_kernel_lock(task, cpu, depth)   ((depth) = 1)

#define reacquire_kernel_lock(task, cpu, depth) do { } while(0)

#else

#error "We do not support SMP on ST50 yet"

/*

 * Default SMP lock implementation

 */

#include <linux/interrupt.h>

#include <asm/spinlock.h>

extern spinlock_t kernel_flag;

/*

 * Getting the big kernel lock.

 *

 * This cannot happen asynchronously,

 * so we only need to worry about other

 * CPU's.

 */

extern __inline__ void lock_kernel(void)

{

        if (!++current->lock_depth)

                spin_lock(&kernel_flag);

}

extern __inline__ void unlock_kernel(void)

{

        if (--current->lock_depth < 0)

                spin_unlock(&kernel_flag);

}

/*

 * Release global kernel lock and global interrupt lock

 */

#define release_kernel_lock(task, cpu) \

do { \

        if (task->lock_depth >= 0) \

                spin_unlock(&kernel_flag); \

        release_irqlock(cpu); \

        __sti(); \

} while (0)

/*

 * Re-acquire the kernel lock

 */

#define reacquire_kernel_lock(task) \

do { \

        if (task->lock_depth >= 0) \

                spin_lock(&kernel_flag); \

} while (0)

#endif /* CONFIG_SMP */

#endif /* __ASM_SH64_SMPLOCK_H */