1. 根目录:
2. arch
3. mips
4. include
5. asm
6. sn
7. sn0
8. arch.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.
 *
 * SGI IP27 specific setup.
 *
 * Copyright (C) 1995 - 1997, 1999 Silcon Graphics, Inc.
 * Copyright (C) 1999 Ralf Baechle (ralf@gnu.org)
 */
#ifndef _ASM_SN_SN0_ARCH_H
#define _ASM_SN_SN0_ARCH_H


#ifndef SN0XXL	/* 128 cpu SMP max */
/*
 * This is the maximum number of nodes that can be part of a kernel.
 * Effectively, it's the maximum number of compact node ids (cnodeid_t).
 */
#define MAX_COMPACT_NODES	64

/*
 * MAXCPUS refers to the maximum number of CPUs in a single kernel.
 * This is not necessarily the same as MAXNODES * CPUS_PER_NODE
 */
#define MAXCPUS			128

#else /* SN0XXL system */

#define MAX_COMPACT_NODES	128
#define MAXCPUS			256

#endif /* SN0XXL */

/*
 * This is the maximum number of NASIDS that can be present in a system.
 * (Highest NASID plus one.)
 */
#define MAX_NASIDS		256

/*
 * MAX_REGIONS refers to the maximum number of hardware partitioned regions.
 */
#define MAX_REGIONS		64
#define MAX_NONPREMIUM_REGIONS	16
#define MAX_PREMIUM_REGIONS	MAX_REGIONS

/*
 * MAX_PARITIONS refers to the maximum number of logically defined
 * partitions the system can support.
 */
#define MAX_PARTITIONS		MAX_REGIONS

#define NASID_MASK_BYTES	((MAX_NASIDS + 7) / 8)

/*
 * Slot constants for SN0
 */
#ifdef CONFIG_SGI_SN_N_MODE
#define MAX_MEM_SLOTS	16			/* max slots per node */
#else /* !CONFIG_SGI_SN_N_MODE, assume CONFIG_SGI_SN_M_MODE */
#define MAX_MEM_SLOTS	32			/* max slots per node */
#endif /* CONFIG_SGI_SN_M_MODE */

#define SLOT_SHIFT		(27)
#define SLOT_MIN_MEM_SIZE	(32*1024*1024)

#define CPUS_PER_NODE		2	/* CPUs on a single hub */
#define CPUS_PER_NODE_SHFT	1	/* Bits to shift in the node number */
#define CPUS_PER_SUBNODE	2	/* CPUs on a single hub PI */

#endif /* _ASM_SN_SN0_ARCH_H */