2 * Written by: Patricia Gaughen, IBM Corporation
4 * Copyright (C) 2002, IBM Corp.
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.
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
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.
23 * Send feedback to <gone@us.ibm.com>
26 #include <linux/config.h>
28 #include <linux/bootmem.h>
29 #include <linux/mmzone.h>
30 #include <linux/module.h>
31 #include <asm/numaq.h>
33 /* These are needed before the pgdat's are created */
34 extern long node_start_pfn[], node_end_pfn[];
36 #define MB_TO_PAGES(addr) ((addr) << (20 - PAGE_SHIFT))
39 * Function: smp_dump_qct()
41 * Description: gets memory layout from the quad config table. This
42 * function also increments numnodes with the number of nodes (quads)
45 static void __init smp_dump_qct(void)
48 struct eachquadmem *eq;
49 struct sys_cfg_data *scd =
50 (struct sys_cfg_data *)__va(SYS_CFG_DATA_PRIV_ADDR);
53 for(node = 0; node < MAX_NUMNODES; node++) {
54 if(scd->quads_present31_0 & (1 << node)) {
55 node_set_online(node);
58 /* Convert to pages */
59 node_start_pfn[node] = MB_TO_PAGES(
60 eq->hi_shrd_mem_start - eq->priv_mem_size);
61 node_end_pfn[node] = MB_TO_PAGES(
62 eq->hi_shrd_mem_start + eq->hi_shrd_mem_size);
68 * for each node mark the regions
69 * TOPOFMEM = hi_shrd_mem_start + hi_shrd_mem_size
71 * need to be very careful to not mark 1024+ as belonging
72 * to node 0. will want 1027 to show as belonging to node 1
75 * 1024 >> 8 = 4 (subtract 1 for starting at 0]
76 * tmpvar = TOPOFMEM - 256 = 768
77 * 1024 >> 8 = 4 (subtract 1 for starting at 0]
80 static void __init initialize_physnode_map(void)
83 unsigned int topofmem, cur;
84 struct eachquadmem *eq;
85 struct sys_cfg_data *scd =
86 (struct sys_cfg_data *)__va(SYS_CFG_DATA_PRIV_ADDR);
89 for(nid = 0; nid < numnodes; nid++) {
90 if(scd->quads_present31_0 & (1 << nid)) {
92 cur = eq->hi_shrd_mem_start;
93 topofmem = eq->hi_shrd_mem_start + eq->hi_shrd_mem_size;
94 while (cur < topofmem) {
95 physnode_map[cur >> 8] = nid;
103 * Unlike Summit, we don't really care to let the NUMA-Q
104 * fall back to flat mode. Don't compile for NUMA-Q
105 * unless you really need it!
107 int __init get_memcfg_numaq(void)
110 initialize_physnode_map();