File: /usr/src/linux/arch/mips64/sgi-ip27/ip27-klnuma.c
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/string.h>
11
12 #include <asm/page.h>
13 #include <asm/smp.h>
14 #include <asm/sn/types.h>
15 #include <asm/sn/arch.h>
16 #include <asm/sn/gda.h>
17 #include <asm/mmzone.h>
18 #include <asm/sn/klkernvars.h>
19 #include <asm/sn/mapped_kernel.h>
20 #include <asm/sn/sn_private.h>
21
22 extern char _end;
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(int maxnodes)
31 {
32 static int numa_kernel_replication_ratio;
33 cnodeid_t cnode;
34
35 /* Set only the master cnode's bit. The master cnode is always 0. */
36 CPUMASK_CLRALL(ktext_repmask);
37 CPUMASK_SETB(ktext_repmask, 0);
38
39 numa_kernel_replication_ratio = 0;
40 #ifdef CONFIG_REPLICATE_KTEXT
41 #ifndef CONFIG_MAPPED_KERNEL
42 #error Kernel replication works with mapped kernel support. No calias support.
43 #endif
44 numa_kernel_replication_ratio = 1;
45 #endif
46
47 for (cnode = 1; cnode < numnodes; cnode++) {
48 /* See if this node should get a copy of the kernel */
49 if (numa_kernel_replication_ratio &&
50 !(cnode % numa_kernel_replication_ratio)) {
51
52 /* Advertise that we have a copy of the kernel */
53 CPUMASK_SETB(ktext_repmask, cnode);
54 }
55 }
56
57 /* Set up a GDA pointer to the replication mask. */
58 GDA->g_ktext_repmask = &ktext_repmask;
59 }
60
61
62 static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
63 {
64 kern_vars_t *kvp;
65 cnodeid_t client_cnode;
66
67 client_cnode = NASID_TO_COMPACT_NODEID(client_nasid);
68
69 kvp = &(PLAT_NODE_DATA(client_cnode)->kern_vars);
70
71 KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;
72
73 kvp->kv_magic = KV_MAGIC;
74
75 kvp->kv_ro_nasid = server_nasid;
76 kvp->kv_rw_nasid = master_nasid;
77 kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid);
78 kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid);
79 printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid);
80 }
81
82 /* XXX - When the BTE works, we should use it instead of this. */
83 static __init void copy_kernel(nasid_t dest_nasid)
84 {
85 extern char _stext, _etext;
86 unsigned long dest_kern_start, source_start, source_end, kern_size;
87
88 source_start = (unsigned long)&_stext;
89 source_end = (unsigned long)&_etext;
90 kern_size = source_end - source_start;
91
92 dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
93 dest_nasid);
94 memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
95 }
96
97 void __init replicate_kernel_text(int maxnodes)
98 {
99 cnodeid_t cnode;
100 nasid_t client_nasid;
101 nasid_t server_nasid;
102
103 server_nasid = master_nasid;
104
105 /* Record where the master node should get its kernel text */
106 set_ktext_source(master_nasid, master_nasid);
107
108 for (cnode = 1; cnode < maxnodes; cnode++) {
109 client_nasid = COMPACT_TO_NASID_NODEID(cnode);
110
111 /* Check if this node should get a copy of the kernel */
112 if (CPUMASK_TSTB(ktext_repmask, cnode)) {
113 server_nasid = client_nasid;
114 copy_kernel(server_nasid);
115 }
116
117 /* Record where this node should get its kernel text */
118 set_ktext_source(client_nasid, server_nasid);
119 }
120 }
121
122 /*
123 * Return pfn of first free page of memory on a node. PROM may allocate
124 * data structures on the first couple of pages of the first slot of each
125 * node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
126 */
127 pfn_t node_getfirstfree(cnodeid_t cnode)
128 {
129 unsigned long loadbase = CKSEG0;
130 nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
131 unsigned long offset;
132
133 #ifdef CONFIG_MAPPED_KERNEL
134 loadbase = CKSSEG + 16777216;
135 #endif
136 offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
137 if ((cnode == 0) || (CPUMASK_TSTB(ktext_repmask, cnode)))
138 return (TO_NODE(nasid, offset) >> PAGE_SHIFT);
139 else
140 return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >>
141 PAGE_SHIFT);
142 }
143
144