sn_pio_sync.h

该文件是rt_linux

/*
 *
 * 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.
 *
 * Copyright (C) 2001-2002 Silicon Graphics, Inc. All rights reserved.
 */


#ifndef _ASM_IA64_SN_SN_PIO_WRITE_SYNC_H
#define _ASM_IA64_SN_SN_PIO_WRITE_SYNC_H

#include <linux/config.h>
#ifdef CONFIG_IA64_SGI_SN2
#include <asm/sn/sn_cpuid.h>
#include <asm/sn/sn2/addrs.h>
#include <asm/sn/sn2/shub_mmr.h>
#include <asm/sn/sn2/shub_mmr_t.h>

/*
 * This macro flushes all outstanding PIOs performed by this cpu to the 
 * intended destination SHUB.  This in essence ensures that all PIO's
 * issues by this cpu has landed at it's destination.
 *
 * This macro expects the caller:
 *	1.  The thread is locked.
 *	2.  All prior PIO operations has been fenced with __ia64_mf_a().
 *
 * The expectation is that get_slice() will return either 0 or 2.
 * When we have multi-core cpu's, the expectation is get_slice() will 
 * return either 0,1 or 2,3.
 */

#define SN_PIO_WRITE_SYNC \
	{ \
		volatile unsigned long sn_pio_writes_done; \
	do { \
		sn_pio_writes_done = (volatile unsigned long) (SH_PIO_WRITE_STATUS_0_WRITES_OK_MASK & HUB_L( (unsigned long *)GLOBAL_MMR_ADDR(get_nasid(), (get_slice() < 2) ? SH_PIO_WRITE_STATUS_0 : SH_PIO_WRITE_STATUS_1 ))); \
	} while (!sn_pio_writes_done); \
	__ia64_mf_a(); \
	}
#else

/*
 * For all ARCHITECTURE type, this is a NOOP.
 */

#define SN_PIO_WRITE_SYNC

#endif

#endif /* _ASM_IA64_SN_SN_PIO_WRITE_SYNC_H */