1 | // SPDX-License-Identifier: GPL-2.0 |
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 | */ |
7 | #include <linux/init.h> |
8 | #include <linux/mm.h> |
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> |
16 | #include <asm/sn/types.h> |
17 | #include <asm/sn/arch.h> |
18 | #include <asm/sn/gda.h> |
19 | #include <asm/sn/mapped_kernel.h> |
20 | |
21 | #include "ip27-common.h" |
22 | |
23 | static nodemask_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(void) |
31 | { |
32 | /* Set only the master cnode's bit. The master cnode is always 0. */ |
33 | nodes_clear(ktext_repmask); |
34 | node_set(0, ktext_repmask); |
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 |
40 | { |
41 | nasid_t nasid; |
42 | |
43 | for_each_online_node(nasid) { |
44 | if (nasid == 0) |
45 | continue; |
46 | /* Advertise that we have a copy of the kernel */ |
47 | node_set(nasid, ktext_repmask); |
48 | } |
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 | { |
58 | kern_vars_t *kvp; |
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(void) |
87 | { |
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(client_nasid) { |
97 | if (client_nasid == 0) |
98 | continue; |
99 | |
100 | /* Check if this node should get a copy of the kernel */ |
101 | if (node_isset(client_nasid, ktext_repmask)) { |
102 | server_nasid = client_nasid; |
103 | copy_kernel(server_nasid); |
104 | } |
105 | |
106 | /* Record where this node should get its kernel text */ |
107 | set_ktext_source(client_nasid, server_nasid); |
108 | } |
109 | } |
110 | |
111 | /* |
112 | * Return pfn of first free page of memory on a node. PROM may allocate |
113 | * data structures on the first couple of pages of the first slot of each |
114 | * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). |
115 | */ |
116 | unsigned long node_getfirstfree(nasid_t nasid) |
117 | { |
118 | unsigned long loadbase = REP_BASE; |
119 | unsigned long offset; |
120 | |
121 | #ifdef CONFIG_MAPPED_KERNEL |
122 | loadbase += 16777216; |
123 | #endif |
124 | offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase; |
125 | if ((nasid == 0) || (node_isset(nasid, ktext_repmask))) |
126 | return TO_NODE(nasid, offset) >> PAGE_SHIFT; |
127 | else |
128 | return KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT; |
129 | } |
130 | |