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/hub.h> 20 #include <asm/sn/mapped_kernel.h> 21 #include <asm/sn/sn_private.h> 22 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(void) 31 { 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); 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 cpumask_set_cpu(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 56 static __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. */ 73 static __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 86 void __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 (cpumask_test_cpu(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 */ 116 unsigned 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) || (cpumask_test_cpu(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