1 /* 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) 5 */ 6 #include <linux/init.h> 7 #include <linux/mm.h> 8 #include <linux/mmzone.h> 9 #include <linux/kernel.h> 10 #include <linux/nodemask.h> 11 #include <linux/string.h> 12 13 #include <asm/page.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> 21 22 static cpumask_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 cpus_clear(ktext_repmask); 33 cpu_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 cnodeid_t cnode; 41 42 for_each_online_node(cnode) { 43 if (cnode == 0) 44 continue; 45 /* Advertise that we have a copy of the kernel */ 46 cpu_set(cnode, 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 cnodeid_t client_cnode; 58 kern_vars_t *kvp; 59 60 client_cnode = NASID_TO_COMPACT_NODEID(client_nasid); 61 62 kvp = &hub_data(client_nasid)->kern_vars; 63 64 KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp; 65 66 kvp->kv_magic = KV_MAGIC; 67 kvp->kv_ro_nasid = server_nasid; 68 kvp->kv_rw_nasid = master_nasid; 69 kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid); 70 kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid); 71 printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid); 72 } 73 74 /* XXX - When the BTE works, we should use it instead of this. */ 75 static __init void copy_kernel(nasid_t dest_nasid) 76 { 77 unsigned long dest_kern_start, source_start, source_end, kern_size; 78 79 source_start = (unsigned long) _stext; 80 source_end = (unsigned long) _etext; 81 kern_size = source_end - source_start; 82 83 dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start), 84 dest_nasid); 85 memcpy((void *)dest_kern_start, (void *)source_start, kern_size); 86 } 87 88 void __init replicate_kernel_text() 89 { 90 cnodeid_t cnode; 91 nasid_t client_nasid; 92 nasid_t server_nasid; 93 94 server_nasid = master_nasid; 95 96 /* Record where the master node should get its kernel text */ 97 set_ktext_source(master_nasid, master_nasid); 98 99 for_each_online_node(cnode) { 100 if (cnode == 0) 101 continue; 102 client_nasid = COMPACT_TO_NASID_NODEID(cnode); 103 104 /* Check if this node should get a copy of the kernel */ 105 if (cpu_isset(cnode, ktext_repmask)) { 106 server_nasid = client_nasid; 107 copy_kernel(server_nasid); 108 } 109 110 /* Record where this node should get its kernel text */ 111 set_ktext_source(client_nasid, server_nasid); 112 } 113 } 114 115 /* 116 * Return pfn of first free page of memory on a node. PROM may allocate 117 * data structures on the first couple of pages of the first slot of each 118 * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). 119 */ 120 pfn_t node_getfirstfree(cnodeid_t cnode) 121 { 122 unsigned long loadbase = REP_BASE; 123 nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode); 124 unsigned long offset; 125 126 #ifdef CONFIG_MAPPED_KERNEL 127 loadbase += 16777216; 128 #endif 129 offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase; 130 if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask))) 131 return (TO_NODE(nasid, offset) >> PAGE_SHIFT); 132 else 133 return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> 134 PAGE_SHIFT); 135 } 136