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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 | 6 | #include <linux/init.h> |
27ac792c | 7 | #include <linux/mm.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
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 | 30 | { |
1da177e4 | 31 | /* Set only the master cnode's bit. The master cnode is always 0. */ |
8dd92891 RR |
32 | cpumask_clear(&ktext_repmask); |
33 | cpumask_set_cpu(0, &ktext_repmask); | |
1da177e4 LT |
34 | |
35 | #ifdef CONFIG_REPLICATE_KTEXT | |
36 | #ifndef CONFIG_MAPPED_KERNEL | |
37 | #error Kernel replication works with mapped kernel support. No calias support. | |
38 | #endif | |
89c96096 RB |
39 | { |
40 | cnodeid_t cnode; | |
41 | ||
42 | for_each_online_node(cnode) { | |
43 | if (cnode == 0) | |
44 | continue; | |
45 | /* Advertise that we have a copy of the kernel */ | |
8dd92891 | 46 | cpumask_set_cpu(cnode, &ktext_repmask); |
89c96096 | 47 | } |
1da177e4 LT |
48 | } |
49 | #endif | |
50 | /* Set up a GDA pointer to the replication mask. */ | |
51 | GDA->g_ktext_repmask = &ktext_repmask; | |
52 | } | |
53 | ||
54 | ||
55 | static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid) | |
56 | { | |
1da177e4 LT |
57 | kern_vars_t *kvp; |
58 | ||
1da177e4 LT |
59 | kvp = &hub_data(client_nasid)->kern_vars; |
60 | ||
61 | KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp; | |
62 | ||
63 | kvp->kv_magic = KV_MAGIC; | |
64 | kvp->kv_ro_nasid = server_nasid; | |
65 | kvp->kv_rw_nasid = master_nasid; | |
66 | kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid); | |
67 | kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid); | |
68 | printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid); | |
69 | } | |
70 | ||
71 | /* XXX - When the BTE works, we should use it instead of this. */ | |
72 | static __init void copy_kernel(nasid_t dest_nasid) | |
73 | { | |
74 | unsigned long dest_kern_start, source_start, source_end, kern_size; | |
75 | ||
76 | source_start = (unsigned long) _stext; | |
77 | source_end = (unsigned long) _etext; | |
78 | kern_size = source_end - source_start; | |
79 | ||
80 | dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start), | |
81 | dest_nasid); | |
82 | memcpy((void *)dest_kern_start, (void *)source_start, kern_size); | |
83 | } | |
84 | ||
85 | void __init replicate_kernel_text() | |
86 | { | |
87 | cnodeid_t cnode; | |
88 | nasid_t client_nasid; | |
89 | nasid_t server_nasid; | |
90 | ||
91 | server_nasid = master_nasid; | |
92 | ||
93 | /* Record where the master node should get its kernel text */ | |
94 | set_ktext_source(master_nasid, master_nasid); | |
95 | ||
96 | for_each_online_node(cnode) { | |
97 | if (cnode == 0) | |
98 | continue; | |
99 | client_nasid = COMPACT_TO_NASID_NODEID(cnode); | |
100 | ||
101 | /* Check if this node should get a copy of the kernel */ | |
8dd92891 | 102 | if (cpumask_test_cpu(cnode, &ktext_repmask)) { |
1da177e4 LT |
103 | server_nasid = client_nasid; |
104 | copy_kernel(server_nasid); | |
105 | } | |
106 | ||
107 | /* Record where this node should get its kernel text */ | |
108 | set_ktext_source(client_nasid, server_nasid); | |
109 | } | |
110 | } | |
111 | ||
112 | /* | |
113 | * Return pfn of first free page of memory on a node. PROM may allocate | |
114 | * data structures on the first couple of pages of the first slot of each | |
115 | * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). | |
116 | */ | |
fc0460d0 | 117 | unsigned long node_getfirstfree(cnodeid_t cnode) |
1da177e4 LT |
118 | { |
119 | unsigned long loadbase = REP_BASE; | |
120 | nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode); | |
121 | unsigned long offset; | |
122 | ||
123 | #ifdef CONFIG_MAPPED_KERNEL | |
124 | loadbase += 16777216; | |
125 | #endif | |
126 | offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase; | |
8dd92891 | 127 | if ((cnode == 0) || (cpumask_test_cpu(cnode, &ktext_repmask))) |
635c9907 | 128 | return TO_NODE(nasid, offset) >> PAGE_SHIFT; |
1da177e4 | 129 | else |
635c9907 | 130 | return KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT; |
1da177e4 | 131 | } |