1 // SPDX-License-Identifier: GPL-2.0
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)
7 #include <linux/init.h>
9 #include <linux/mmzone.h>
10 #include <linux/kernel.h>
11 #include <linux/nodemask.h>
12 #include <linux/string.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/hub.h>
20 #include <asm/sn/mapped_kernel.h>
21 #include <asm/sn/sn_private.h>
23 static cpumask_t ktext_repmask;
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.
30 void __init setup_replication_mask(void)
32 /* Set only the master cnode's bit. The master cnode is always 0. */
33 cpumask_clear(&ktext_repmask);
34 cpumask_set_cpu(0, &ktext_repmask);
36 #ifdef CONFIG_REPLICATE_KTEXT
37 #ifndef CONFIG_MAPPED_KERNEL
38 #error Kernel replication works with mapped kernel support. No calias support.
43 for_each_online_node(cnode) {
46 /* Advertise that we have a copy of the kernel */
47 cpumask_set_cpu(cnode, &ktext_repmask);
51 /* Set up a GDA pointer to the replication mask. */
52 GDA->g_ktext_repmask = &ktext_repmask;
56 static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
60 kvp = &hub_data(client_nasid)->kern_vars;
62 KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;
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);
72 /* XXX - When the BTE works, we should use it instead of this. */
73 static __init void copy_kernel(nasid_t dest_nasid)
75 unsigned long dest_kern_start, source_start, source_end, kern_size;
77 source_start = (unsigned long) _stext;
78 source_end = (unsigned long) _etext;
79 kern_size = source_end - source_start;
81 dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
83 memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
86 void __init replicate_kernel_text(void)
92 server_nasid = master_nasid;
94 /* Record where the master node should get its kernel text */
95 set_ktext_source(master_nasid, master_nasid);
97 for_each_online_node(cnode) {
100 client_nasid = COMPACT_TO_NASID_NODEID(cnode);
102 /* Check if this node should get a copy of the kernel */
103 if (cpumask_test_cpu(cnode, &ktext_repmask)) {
104 server_nasid = client_nasid;
105 copy_kernel(server_nasid);
108 /* Record where this node should get its kernel text */
109 set_ktext_source(client_nasid, server_nasid);
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).
118 unsigned long node_getfirstfree(cnodeid_t cnode)
120 unsigned long loadbase = REP_BASE;
121 nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
122 unsigned long offset;
124 #ifdef CONFIG_MAPPED_KERNEL
125 loadbase += 16777216;
127 offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
128 if ((cnode == 0) || (cpumask_test_cpu(cnode, &ktext_repmask)))
129 return TO_NODE(nasid, offset) >> PAGE_SHIFT;
131 return KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT;