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/*
* File: $RCSfile$
* Project: PixelFlow
* Created: 94/11/29
* RespEngr: tony e bennett
* Revision: $Revision$
* Last Mod: $Date$
*
* COPYRIGHT (c) 1994 by Division Incorporated
*
* To anyone who acknowledges that this file is provided "AS IS"
* without any express or implied warranty:
* permission to use, copy, modify, and distribute this file
* for any purpose is hereby granted without fee, provided that
* the above copyright notice and this notice appears in all
* copies, and that the name of Division Incorporated not be
* used in advertising or publicity pertaining to distribution
* of the software without specific, written prior permission.
* Division Incorporated makes no representations about the
* suitability of this software for any purpose.
*
* Description:
* HPPA fast spinlock semaphores based on LDCWX instruction.
* These semaphores are not known to RTEMS.
*
* TODO:
*
* $Id$
*/
#ifndef _INCLUDE_SEMAPHORE_H
#define _INCLUDE_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 */
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