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)
6 #include <linux/init.h>
8 #include <linux/mmzone.h>
9 #include <linux/kernel.h>
10 #include <linux/nodemask.h>
11 #include <linux/string.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>
22 static cpumask_t ktext_repmask
;
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.
29 void __init
setup_replication_mask(void)
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
);
35 #ifdef CONFIG_REPLICATE_KTEXT
36 #ifndef CONFIG_MAPPED_KERNEL
37 #error Kernel replication works with mapped kernel support. No calias support.
42 for_each_online_node(cnode
) {
45 /* Advertise that we have a copy of the kernel */
46 cpu_set(cnode
, ktext_repmask
);
50 /* Set up a GDA pointer to the replication mask. */
51 GDA
->g_ktext_repmask
= &ktext_repmask
;
55 static __init
void set_ktext_source(nasid_t client_nasid
, nasid_t server_nasid
)
59 kvp
= &hub_data(client_nasid
)->kern_vars
;
61 KERN_VARS_ADDR(client_nasid
) = (unsigned long)kvp
;
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
);
71 /* XXX - When the BTE works, we should use it instead of this. */
72 static __init
void copy_kernel(nasid_t dest_nasid
)
74 unsigned long dest_kern_start
, source_start
, source_end
, kern_size
;
76 source_start
= (unsigned long) _stext
;
77 source_end
= (unsigned long) _etext
;
78 kern_size
= source_end
- source_start
;
80 dest_kern_start
= CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start
),
82 memcpy((void *)dest_kern_start
, (void *)source_start
, kern_size
);
85 void __init
replicate_kernel_text()
91 server_nasid
= master_nasid
;
93 /* Record where the master node should get its kernel text */
94 set_ktext_source(master_nasid
, master_nasid
);
96 for_each_online_node(cnode
) {
99 client_nasid
= COMPACT_TO_NASID_NODEID(cnode
);
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
);
107 /* Record where this node should get its kernel text */
108 set_ktext_source(client_nasid
, server_nasid
);
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).
117 pfn_t
node_getfirstfree(cnodeid_t cnode
)
119 unsigned long loadbase
= REP_BASE
;
120 nasid_t nasid
= COMPACT_TO_NASID_NODEID(cnode
);
121 unsigned long offset
;
123 #ifdef CONFIG_MAPPED_KERNEL
124 loadbase
+= 16777216;
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
);
130 return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid
, 0))) >>
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