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
23static 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 */
30void __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
56static __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. */
73static __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
86void __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 */
116unsigned 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