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/init.h>
7 #include <linux/mm.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/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 */
setup_replication_mask(void)29 void __init setup_replication_mask(void)
30 {
31 /* Set only the master cnode's bit. The master cnode is always 0. */
32 cpus_clear(ktext_repmask);
33 cpu_set(0, ktext_repmask);
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
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 */
46 cpu_set(cnode, ktext_repmask);
47 }
48 }
49 #endif
50 /* Set up a GDA pointer to the replication mask. */
51 GDA->g_ktext_repmask = &ktext_repmask;
52 }
53
54
set_ktext_source(nasid_t client_nasid,nasid_t server_nasid)55 static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
56 {
57 kern_vars_t *kvp;
58
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. */
copy_kernel(nasid_t dest_nasid)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
replicate_kernel_text()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 */
102 if (cpu_isset(cnode, ktext_repmask)) {
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 */
node_getfirstfree(cnodeid_t cnode)117 pfn_t node_getfirstfree(cnodeid_t cnode)
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;
127 if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask)))
128 return (TO_NODE(nasid, offset) >> PAGE_SHIFT);
129 else
130 return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >>
131 PAGE_SHIFT);
132 }
133