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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 | */ | |
6 | #include <linux/config.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/mmzone.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/nodemask.h> | |
11 | #include <linux/string.h> | |
12 | ||
13 | #include <asm/page.h> | |
14 | #include <asm/sections.h> | |
15 | #include <asm/smp.h> | |
16 | #include <asm/sn/types.h> | |
17 | #include <asm/sn/arch.h> | |
18 | #include <asm/sn/gda.h> | |
19 | #include <asm/sn/hub.h> | |
20 | #include <asm/sn/mapped_kernel.h> | |
21 | #include <asm/sn/sn_private.h> | |
22 | ||
23 | static cpumask_t ktext_repmask; | |
24 | ||
25 | /* | |
26 | * XXX - This needs to be much smarter about where it puts copies of the | |
27 | * kernel. For example, we should never put a copy on a headless node, | |
28 | * and we should respect the topology of the machine. | |
29 | */ | |
30 | void __init setup_replication_mask() | |
31 | { | |
32 | cnodeid_t cnode; | |
33 | ||
34 | /* Set only the master cnode's bit. The master cnode is always 0. */ | |
35 | cpus_clear(ktext_repmask); | |
36 | cpu_set(0, ktext_repmask); | |
37 | ||
38 | #ifdef CONFIG_REPLICATE_KTEXT | |
39 | #ifndef CONFIG_MAPPED_KERNEL | |
40 | #error Kernel replication works with mapped kernel support. No calias support. | |
41 | #endif | |
42 | for_each_online_node(cnode) { | |
43 | if (cnode == 0) | |
44 | continue; | |
45 | /* Advertise that we have a copy of the kernel */ | |
46 | cpu_set(cnode, ktext_repmask); | |
47 | } | |
48 | #endif | |
49 | /* Set up a GDA pointer to the replication mask. */ | |
50 | GDA->g_ktext_repmask = &ktext_repmask; | |
51 | } | |
52 | ||
53 | ||
54 | static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid) | |
55 | { | |
56 | cnodeid_t client_cnode; | |
57 | kern_vars_t *kvp; | |
58 | ||
59 | client_cnode = NASID_TO_COMPACT_NODEID(client_nasid); | |
60 | ||
61 | kvp = &hub_data(client_nasid)->kern_vars; | |
62 | ||
63 | KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp; | |
64 | ||
65 | kvp->kv_magic = KV_MAGIC; | |
66 | kvp->kv_ro_nasid = server_nasid; | |
67 | kvp->kv_rw_nasid = master_nasid; | |
68 | kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid); | |
69 | kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid); | |
70 | printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid); | |
71 | } | |
72 | ||
73 | /* XXX - When the BTE works, we should use it instead of this. */ | |
74 | static __init void copy_kernel(nasid_t dest_nasid) | |
75 | { | |
76 | unsigned long dest_kern_start, source_start, source_end, kern_size; | |
77 | ||
78 | source_start = (unsigned long) _stext; | |
79 | source_end = (unsigned long) _etext; | |
80 | kern_size = source_end - source_start; | |
81 | ||
82 | dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start), | |
83 | dest_nasid); | |
84 | memcpy((void *)dest_kern_start, (void *)source_start, kern_size); | |
85 | } | |
86 | ||
87 | void __init replicate_kernel_text() | |
88 | { | |
89 | cnodeid_t cnode; | |
90 | nasid_t client_nasid; | |
91 | nasid_t server_nasid; | |
92 | ||
93 | server_nasid = master_nasid; | |
94 | ||
95 | /* Record where the master node should get its kernel text */ | |
96 | set_ktext_source(master_nasid, master_nasid); | |
97 | ||
98 | for_each_online_node(cnode) { | |
99 | if (cnode == 0) | |
100 | continue; | |
101 | client_nasid = COMPACT_TO_NASID_NODEID(cnode); | |
102 | ||
103 | /* Check if this node should get a copy of the kernel */ | |
104 | if (cpu_isset(cnode, ktext_repmask)) { | |
105 | server_nasid = client_nasid; | |
106 | copy_kernel(server_nasid); | |
107 | } | |
108 | ||
109 | /* Record where this node should get its kernel text */ | |
110 | set_ktext_source(client_nasid, server_nasid); | |
111 | } | |
112 | } | |
113 | ||
114 | /* | |
115 | * Return pfn of first free page of memory on a node. PROM may allocate | |
116 | * data structures on the first couple of pages of the first slot of each | |
117 | * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). | |
118 | */ | |
119 | pfn_t node_getfirstfree(cnodeid_t cnode) | |
120 | { | |
121 | unsigned long loadbase = REP_BASE; | |
122 | nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode); | |
123 | unsigned long offset; | |
124 | ||
125 | #ifdef CONFIG_MAPPED_KERNEL | |
126 | loadbase += 16777216; | |
127 | #endif | |
128 | offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase; | |
129 | if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask))) | |
130 | return (TO_NODE(nasid, offset) >> PAGE_SHIFT); | |
131 | else | |
132 | return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> | |
133 | PAGE_SHIFT); | |
134 | } | |
135 |