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/mm.h>
27 #include <linux/bootmem.h>
28 #include <linux/mmzone.h>
29 #include <linux/module.h>
30 #include <linux/nodemask.h>
31 #include <asm/numaq.h>
32 #include <asm/topology.h>
33 #include <asm/processor.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 */
43 static 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 */
75 int __init get_memcfg_numaq(void)
76 {
77 smp_dump_qct();
78 return 1;
79 }
80
81 static int __init numaq_tsc_disable(void)
82 {
83 if (num_online_nodes() > 1) {
84 printk(KERN_DEBUG "NUMAQ: disabling TSC\n");
85 setup_clear_cpu_cap(X86_FEATURE_TSC);
86 }
87 return 0;
88 }
89 arch_initcall(numaq_tsc_disable);
90
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