numaq.c

来自「优龙2410linux2.6.8内核源代码」· C语言 代码 · 共 77 行

/*
 * Written by: Patricia Gaughen, IBM Corporation
 *
 * Copyright (C) 2002, IBM Corp.
 *
 * All rights reserved.          
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <[e-mail]>
 */

#include <linux/config.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/mmzone.h>
#include <linux/module.h>
#include <asm/numaq.h>

/* These are needed before the pgdat's are created */
extern long node_start_pfn[], node_end_pfn[];

#define	MB_TO_PAGES(addr) ((addr) << (20 - PAGE_SHIFT))

/*
 * Function: smp_dump_qct()
 *
 * Description: gets memory layout from the quad config table.  This
 * function also increments numnodes with the number of nodes (quads)
 * present.
 */
static void __init smp_dump_qct(void)
{
	int node;
	struct eachquadmem *eq;
	struct sys_cfg_data *scd =
		(struct sys_cfg_data *)__va(SYS_CFG_DATA_PRIV_ADDR);

	numnodes = 0;
	for(node = 0; node < MAX_NUMNODES; node++) {
		if(scd->quads_present31_0 & (1 << node)) {
			node_set_online(node);
			numnodes++;
			eq = &scd->eq[node];
			/* Convert to pages */
			node_start_pfn[node] = MB_TO_PAGES(
				eq->hi_shrd_mem_start - eq->priv_mem_size);
			node_end_pfn[node] = MB_TO_PAGES(
				eq->hi_shrd_mem_start + eq->hi_shrd_mem_size);
		}
	}
}

/*
 * Unlike Summit, we don't really care to let the NUMA-Q
 * fall back to flat mode.  Don't compile for NUMA-Q
 * unless you really need it!
 */
int __init get_memcfg_numaq(void)
{
	smp_dump_qct();
	return 1;
}