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/mmzone.h> 8 #include <linux/kernel.h> 9 #include <linux/nodemask.h> 10 #include <linux/string.h> 11 12 #include <asm/page.h> 13 #include <asm/sections.h> 14 #include <asm/sn/types.h> 15 #include <asm/sn/arch.h> 16 #include <asm/sn/gda.h> 17 #include <asm/sn/hub.h> 18 #include <asm/sn/mapped_kernel.h> 19 #include <asm/sn/sn_private.h> 20 21 static cpumask_t ktext_repmask; 22 23 /* 24 * XXX - This needs to be much smarter about where it puts copies of the 25 * kernel. For example, we should never put a copy on a headless node, 26 * and we should respect the topology of the machine. 27 */ 28 void __init setup_replication_mask(void) 29 { 30 /* Set only the master cnode's bit. The master cnode is always 0. */ 31 cpus_clear(ktext_repmask); 32 cpu_set(0, ktext_repmask); 33 34 #ifdef CONFIG_REPLICATE_KTEXT 35 #ifndef CONFIG_MAPPED_KERNEL 36 #error Kernel replication works with mapped kernel support. No calias support. 37 #endif 38 { 39 cnodeid_t cnode; 40 41 for_each_online_node(cnode) { 42 if (cnode == 0) 43 continue; 44 /* Advertise that we have a copy of the kernel */ 45 cpu_set(cnode, ktext_repmask); 46 } 47 } 48 #endif 49 /* Set up a GDA pointer to the replication mask. */ 50 GDA->g_ktext_repmask = &ktext_repmask; 51 } 52 53 54 static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid) 55 { 56 cnodeid_t client_cnode; 57 kern_vars_t *kvp; 58 59 client_cnode = NASID_TO_COMPACT_NODEID(client_nasid); 60 61 kvp = &hub_data(client_nasid)->kern_vars; 62 63 KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp; 64 65 kvp->kv_magic = KV_MAGIC; 66 kvp->kv_ro_nasid = server_nasid; 67 kvp->kv_rw_nasid = master_nasid; 68 kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid); 69 kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid); 70 printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid); 71 } 72 73 /* XXX - When the BTE works, we should use it instead of this. */ 74 static __init void copy_kernel(nasid_t dest_nasid) 75 { 76 unsigned long dest_kern_start, source_start, source_end, kern_size; 77 78 source_start = (unsigned long) _stext; 79 source_end = (unsigned long) _etext; 80 kern_size = source_end - source_start; 81 82 dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start), 83 dest_nasid); 84 memcpy((void *)dest_kern_start, (void *)source_start, kern_size); 85 } 86 87 void __init replicate_kernel_text() 88 { 89 cnodeid_t cnode; 90 nasid_t client_nasid; 91 nasid_t server_nasid; 92 93 server_nasid = master_nasid; 94 95 /* Record where the master node should get its kernel text */ 96 set_ktext_source(master_nasid, master_nasid); 97 98 for_each_online_node(cnode) { 99 if (cnode == 0) 100 continue; 101 client_nasid = COMPACT_TO_NASID_NODEID(cnode); 102 103 /* Check if this node should get a copy of the kernel */ 104 if (cpu_isset(cnode, ktext_repmask)) { 105 server_nasid = client_nasid; 106 copy_kernel(server_nasid); 107 } 108 109 /* Record where this node should get its kernel text */ 110 set_ktext_source(client_nasid, server_nasid); 111 } 112 } 113 114 /* 115 * Return pfn of first free page of memory on a node. PROM may allocate 116 * data structures on the first couple of pages of the first slot of each 117 * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). 118 */ 119 pfn_t node_getfirstfree(cnodeid_t cnode) 120 { 121 unsigned long loadbase = REP_BASE; 122 nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode); 123 unsigned long offset; 124 125 #ifdef CONFIG_MAPPED_KERNEL 126 loadbase += 16777216; 127 #endif 128 offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase; 129 if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask))) 130 return (TO_NODE(nasid, offset) >> PAGE_SHIFT); 131 else 132 return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> 133 PAGE_SHIFT); 134 } 135 136