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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00. | |
4 | * Copyright 2000 - 2001 Silicon Graphics, Inc. | |
5 | * Copyright 2000 - 2001 Kanoj Sarcar (kanoj@sgi.com) | |
6 | */ | |
1da177e4 | 7 | #include <linux/init.h> |
27ac792c | 8 | #include <linux/mm.h> |
1da177e4 LT |
9 | #include <linux/mmzone.h> |
10 | #include <linux/kernel.h> | |
11 | #include <linux/nodemask.h> | |
12 | #include <linux/string.h> | |
13 | ||
14 | #include <asm/page.h> | |
15 | #include <asm/sections.h> | |
1da177e4 LT |
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 | */ | |
c11b3c1b | 30 | void __init setup_replication_mask(void) |
1da177e4 | 31 | { |
1da177e4 | 32 | /* Set only the master cnode's bit. The master cnode is always 0. */ |
8dd92891 RR |
33 | cpumask_clear(&ktext_repmask); |
34 | cpumask_set_cpu(0, &ktext_repmask); | |
1da177e4 LT |
35 | |
36 | #ifdef CONFIG_REPLICATE_KTEXT | |
37 | #ifndef CONFIG_MAPPED_KERNEL | |
38 | #error Kernel replication works with mapped kernel support. No calias support. | |
39 | #endif | |
89c96096 RB |
40 | { |
41 | cnodeid_t cnode; | |
42 | ||
43 | for_each_online_node(cnode) { | |
44 | if (cnode == 0) | |
45 | continue; | |
46 | /* Advertise that we have a copy of the kernel */ | |
8dd92891 | 47 | cpumask_set_cpu(cnode, &ktext_repmask); |
89c96096 | 48 | } |
1da177e4 LT |
49 | } |
50 | #endif | |
51 | /* Set up a GDA pointer to the replication mask. */ | |
52 | GDA->g_ktext_repmask = &ktext_repmask; | |
53 | } | |
54 | ||
55 | ||
56 | static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid) | |
57 | { | |
1da177e4 LT |
58 | kern_vars_t *kvp; |
59 | ||
1da177e4 LT |
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 | ||
42b76a1d | 86 | void __init replicate_kernel_text(void) |
1da177e4 LT |
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 */ | |
8dd92891 | 103 | if (cpumask_test_cpu(cnode, &ktext_repmask)) { |
1da177e4 LT |
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 | */ | |
fc0460d0 | 118 | unsigned long node_getfirstfree(cnodeid_t cnode) |
1da177e4 LT |
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; | |
8dd92891 | 128 | if ((cnode == 0) || (cpumask_test_cpu(cnode, &ktext_repmask))) |
635c9907 | 129 | return TO_NODE(nasid, offset) >> PAGE_SHIFT; |
1da177e4 | 130 | else |
635c9907 | 131 | return KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT; |
1da177e4 | 132 | } |