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/*

 *  Description:

 *      HPPA fast spinlock semaphores based on LDCWX instruction.

 *      These semaphores are not known to RTEMS.

 *

 *  TODO:

 *

 *  COPYRIGHT (c) 1994,95 by Division Incorporated

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: semaphore.h,v 1.2 2001-09-27 12:01:21 chris Exp $

 */

#ifndef _INCLUDE_HPPA1_1_SEMAPHORE_H

#define _INCLUDE_HPPA1_1_SEMAPHORE_H

#ifdef __cplusplus

extern "C" {

#endif

/*

 * This structure has hardware requirements.

 * LDCWX opcode requires 16byte alignment for the lock

 * 'lock' must be first member of structure.

 */

#define SEM_ALIGN  16

typedef volatile struct {

    rtems_unsigned32 lock __attribute__ ((aligned (SEM_ALIGN)));

    rtems_unsigned32 flags;

    void *owner_tcb;            /* for debug/commentary only */

    rtems_unsigned32 user;      /* for use by user */

} hppa_semaphore_t;

/*

 * Values for flags

 */

#define HPPA_SEM_IN_USE            0x0001  /* semaphore owned by somebody */

#define HPPA_SEM_NO_SPIN           0x0002  /* don't spin if unavailable */

#define HPPA_SEM_INITIALLY_FREE    0x0004  /* init it to be free */

/*

 * Caller specifiable flags

 */

#define HPPA_SEM_CALLER_FLAGS (HPPA_SEM_NO_SPIN | HPPA_SEM_INITIALLY_FREE)

void hppa_semaphore_pool_initialize(void *pool_base, int pool_size);

rtems_unsigned32  hppa_semaphore_acquire(hppa_semaphore_t *sp, int flag);

void hppa_semaphore_release(hppa_semaphore_t *sp);

hppa_semaphore_t *hppa_semaphore_allocate(rtems_unsigned32 which, int flag);

#ifdef __cplusplus

}

#endif

#endif /* ! _INCLUDE_SEMAPHORE_H */