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 #include <asm/sn/sn_private.h> 21 22 static nodemask_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 */ 29 void __init setup_replication_mask(void) 30 { 31 /* Set only the master cnode's bit. The master cnode is always 0. */ 32 nodes_clear(ktext_repmask); 33 node_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 nasid_t nasid; 41 42 for_each_online_node(nasid) { 43 if (nasid == 0) 44 continue; 45 /* Advertise that we have a copy of the kernel */ 46 node_set(nasid, 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 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. */ 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 85 void __init replicate_kernel_text(void) 86 { 87 nasid_t client_nasid; 88 nasid_t server_nasid; 89 90 server_nasid = master_nasid; 91 92 /* Record where the master node should get its kernel text */ 93 set_ktext_source(master_nasid, master_nasid); 94 95 for_each_online_node(client_nasid) { 96 if (client_nasid == 0) 97 continue; 98 99 /* Check if this node should get a copy of the kernel */ 100 if (node_isset(client_nasid, ktext_repmask)) { 101 server_nasid = client_nasid; 102 copy_kernel(server_nasid); 103 } 104 105 /* Record where this node should get its kernel text */ 106 set_ktext_source(client_nasid, server_nasid); 107 } 108 } 109 110 /* 111 * Return pfn of first free page of memory on a node. PROM may allocate 112 * data structures on the first couple of pages of the first slot of each 113 * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). 114 */ 115 unsigned long node_getfirstfree(nasid_t nasid) 116 { 117 unsigned long loadbase = REP_BASE; 118 unsigned long offset; 119 120 #ifdef CONFIG_MAPPED_KERNEL 121 loadbase += 16777216; 122 #endif 123 offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase; 124 if ((nasid == 0) || (node_isset(nasid, ktext_repmask))) 125 return TO_NODE(nasid, offset) >> PAGE_SHIFT; 126 else 127 return KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT; 128 } 129