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1da177e4 LT |
1 | /* |
2 | * Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00. | |
3 | * Copyright 2000 - 2001 Silicon Graphics, Inc. | |
4 | * Copyright 2000 - 2001 Kanoj Sarcar (kanoj@sgi.com) | |
5 | */ | |
1da177e4 LT |
6 | #include <linux/init.h> |
7 | #include <linux/mmzone.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/nodemask.h> | |
10 | #include <linux/string.h> | |
11 | ||
12 | #include <asm/page.h> | |
13 | #include <asm/sections.h> | |
14 | #include <asm/smp.h> | |
15 | #include <asm/sn/types.h> | |
16 | #include <asm/sn/arch.h> | |
17 | #include <asm/sn/gda.h> | |
18 | #include <asm/sn/hub.h> | |
19 | #include <asm/sn/mapped_kernel.h> | |
20 | #include <asm/sn/sn_private.h> | |
21 | ||
22 | static cpumask_t ktext_repmask; | |
23 | ||
24 | /* | |
25 | * XXX - This needs to be much smarter about where it puts copies of the | |
26 | * kernel. For example, we should never put a copy on a headless node, | |
27 | * and we should respect the topology of the machine. | |
28 | */ | |
c11b3c1b | 29 | void __init setup_replication_mask(void) |
1da177e4 LT |
30 | { |
31 | cnodeid_t cnode; | |
32 | ||
33 | /* Set only the master cnode's bit. The master cnode is always 0. */ | |
34 | cpus_clear(ktext_repmask); | |
35 | cpu_set(0, ktext_repmask); | |
36 | ||
37 | #ifdef CONFIG_REPLICATE_KTEXT | |
38 | #ifndef CONFIG_MAPPED_KERNEL | |
39 | #error Kernel replication works with mapped kernel support. No calias support. | |
40 | #endif | |
41 | for_each_online_node(cnode) { | |
42 | if (cnode == 0) | |
43 | continue; | |
44 | /* Advertise that we have a copy of the kernel */ | |
45 | cpu_set(cnode, ktext_repmask); | |
46 | } | |
47 | #endif | |
48 | /* Set up a GDA pointer to the replication mask. */ | |
49 | GDA->g_ktext_repmask = &ktext_repmask; | |
50 | } | |
51 | ||
52 | ||
53 | static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid) | |
54 | { | |
55 | cnodeid_t client_cnode; | |
56 | kern_vars_t *kvp; | |
57 | ||
58 | client_cnode = NASID_TO_COMPACT_NODEID(client_nasid); | |
59 | ||
60 | kvp = &hub_data(client_nasid)->kern_vars; | |
61 | ||
62 | KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp; | |
63 | ||
64 | kvp->kv_magic = KV_MAGIC; | |
65 | kvp->kv_ro_nasid = server_nasid; | |
66 | kvp->kv_rw_nasid = master_nasid; | |
67 | kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid); | |
68 | kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid); | |
69 | printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid); | |
70 | } | |
71 | ||
72 | /* XXX - When the BTE works, we should use it instead of this. */ | |
73 | static __init void copy_kernel(nasid_t dest_nasid) | |
74 | { | |
75 | unsigned long dest_kern_start, source_start, source_end, kern_size; | |
76 | ||
77 | source_start = (unsigned long) _stext; | |
78 | source_end = (unsigned long) _etext; | |
79 | kern_size = source_end - source_start; | |
80 | ||
81 | dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start), | |
82 | dest_nasid); | |
83 | memcpy((void *)dest_kern_start, (void *)source_start, kern_size); | |
84 | } | |
85 | ||
86 | void __init replicate_kernel_text() | |
87 | { | |
88 | cnodeid_t cnode; | |
89 | nasid_t client_nasid; | |
90 | nasid_t server_nasid; | |
91 | ||
92 | server_nasid = master_nasid; | |
93 | ||
94 | /* Record where the master node should get its kernel text */ | |
95 | set_ktext_source(master_nasid, master_nasid); | |
96 | ||
97 | for_each_online_node(cnode) { | |
98 | if (cnode == 0) | |
99 | continue; | |
100 | client_nasid = COMPACT_TO_NASID_NODEID(cnode); | |
101 | ||
102 | /* Check if this node should get a copy of the kernel */ | |
103 | if (cpu_isset(cnode, ktext_repmask)) { | |
104 | server_nasid = client_nasid; | |
105 | copy_kernel(server_nasid); | |
106 | } | |
107 | ||
108 | /* Record where this node should get its kernel text */ | |
109 | set_ktext_source(client_nasid, server_nasid); | |
110 | } | |
111 | } | |
112 | ||
113 | /* | |
114 | * Return pfn of first free page of memory on a node. PROM may allocate | |
115 | * data structures on the first couple of pages of the first slot of each | |
116 | * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). | |
117 | */ | |
118 | pfn_t node_getfirstfree(cnodeid_t cnode) | |
119 | { | |
120 | unsigned long loadbase = REP_BASE; | |
121 | nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode); | |
122 | unsigned long offset; | |
123 | ||
124 | #ifdef CONFIG_MAPPED_KERNEL | |
125 | loadbase += 16777216; | |
126 | #endif | |
127 | offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase; | |
128 | if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask))) | |
129 | return (TO_NODE(nasid, offset) >> PAGE_SHIFT); | |
130 | else | |
131 | return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> | |
132 | PAGE_SHIFT); | |
133 | } | |
134 |