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/smp.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 cnodeid_t cnode; 32 33 /* Set only the master cnode's bit. The master cnode is always 0. */ 34 cpus_clear(ktext_repmask); 35 cpu_set(0, ktext_repmask); 36 37 #ifdef CONFIG_REPLICATE_KTEXT 38 #ifndef CONFIG_MAPPED_KERNEL 39 #error Kernel replication works with mapped kernel support. No calias support. 40 #endif 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 #endif 48 /* Set up a GDA pointer to the replication mask. */ 49 GDA->g_ktext_repmask = &ktext_repmask; 50 } 51 52 53 static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid) 54 { 55 cnodeid_t client_cnode; 56 kern_vars_t *kvp; 57 58 client_cnode = NASID_TO_COMPACT_NODEID(client_nasid); 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() 87 { 88 cnodeid_t cnode; 89 nasid_t client_nasid; 90 nasid_t server_nasid; 91 92 server_nasid = master_nasid; 93 94 /* Record where the master node should get its kernel text */ 95 set_ktext_source(master_nasid, master_nasid); 96 97 for_each_online_node(cnode) { 98 if (cnode == 0) 99 continue; 100 client_nasid = COMPACT_TO_NASID_NODEID(cnode); 101 102 /* Check if this node should get a copy of the kernel */ 103 if (cpu_isset(cnode, ktext_repmask)) { 104 server_nasid = client_nasid; 105 copy_kernel(server_nasid); 106 } 107 108 /* Record where this node should get its kernel text */ 109 set_ktext_source(client_nasid, server_nasid); 110 } 111 } 112 113 /* 114 * Return pfn of first free page of memory on a node. PROM may allocate 115 * data structures on the first couple of pages of the first slot of each 116 * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). 117 */ 118 pfn_t node_getfirstfree(cnodeid_t cnode) 119 { 120 unsigned long loadbase = REP_BASE; 121 nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode); 122 unsigned long offset; 123 124 #ifdef CONFIG_MAPPED_KERNEL 125 loadbase += 16777216; 126 #endif 127 offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase; 128 if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask))) 129 return (TO_NODE(nasid, offset) >> PAGE_SHIFT); 130 else 131 return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> 132 PAGE_SHIFT); 133 } 134 135