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/arch/i386/kernel/numaq.c

https://bitbucket.org/evzijst/gittest
C | 79 lines | 37 code | 6 blank | 36 comment | 1 complexity | b1b75b3ed921d02080f15b95341ad5de MD5 | raw file
 1/*
 2 * Written by: Patricia Gaughen, IBM Corporation
 3 *
 4 * Copyright (C) 2002, IBM Corp.
 5 *
 6 * All rights reserved.          
 7 *
 8 * This program is free software; you can redistribute it and/or modify
 9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
16 * NON INFRINGEMENT.  See the GNU General Public License for more
17 * details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 * Send feedback to <gone@us.ibm.com>
24 */
25
26#include <linux/config.h>
27#include <linux/mm.h>
28#include <linux/bootmem.h>
29#include <linux/mmzone.h>
30#include <linux/module.h>
31#include <linux/nodemask.h>
32#include <asm/numaq.h>
33#include <asm/topology.h>
34
35#define	MB_TO_PAGES(addr) ((addr) << (20 - PAGE_SHIFT))
36
37/*
38 * Function: smp_dump_qct()
39 *
40 * Description: gets memory layout from the quad config table.  This
41 * function also updates node_online_map with the nodes (quads) present.
42 */
43static void __init smp_dump_qct(void)
44{
45	int node;
46	struct eachquadmem *eq;
47	struct sys_cfg_data *scd =
48		(struct sys_cfg_data *)__va(SYS_CFG_DATA_PRIV_ADDR);
49
50	nodes_clear(node_online_map);
51	for_each_node(node) {
52		if (scd->quads_present31_0 & (1 << node)) {
53			node_set_online(node);
54			eq = &scd->eq[node];
55			/* Convert to pages */
56			node_start_pfn[node] = MB_TO_PAGES(
57				eq->hi_shrd_mem_start - eq->priv_mem_size);
58			node_end_pfn[node] = MB_TO_PAGES(
59				eq->hi_shrd_mem_start + eq->hi_shrd_mem_size);
60
61			memory_present(node,
62				node_start_pfn[node], node_end_pfn[node]);
63			node_remap_size[node] = node_memmap_size_bytes(node,
64							node_start_pfn[node],
65							node_end_pfn[node]);
66		}
67	}
68}
69
70/*
71 * Unlike Summit, we don't really care to let the NUMA-Q
72 * fall back to flat mode.  Don't compile for NUMA-Q
73 * unless you really need it!
74 */
75int __init get_memcfg_numaq(void)
76{
77	smp_dump_qct();
78	return 1;
79}