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 22static cpumask_t ktext_repmask; 23 24void __init setup_replication_mask(void) 25{ 26 cnodeid_t cnode; 27 28 /* Set only the master cnode's bit. The master cnode is always 0. */ 29 cpus_clear(ktext_repmask); 30 cpu_set(0, ktext_repmask); 31 32#ifdef CONFIG_REPLICATE_KTEXT 33#ifndef CONFIG_MAPPED_KERNEL 34#error Kernel replication works with mapped kernel support. No calias support. 35#endif 36 for_each_online_node(cnode) { 37 if (cnode == 0) 38 continue; 39 /* Advertise that we have a copy of the kernel */ 40 cpu_set(cnode, ktext_repmask); 41 } 42#endif 43 /* Set up a GDA pointer to the replication mask. */ 44 GDA->g_ktext_repmask = &ktext_repmask; 45} 46 47 48static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid) 49{ 50 cnodeid_t client_cnode; 51 kern_vars_t *kvp; 52 53 client_cnode = NASID_TO_COMPACT_NODEID(client_nasid); 54 55 kvp = &hub_data(client_nasid)->kern_vars; 56 57 KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp; 58 59 kvp->kv_magic = KV_MAGIC; 60 kvp->kv_ro_nasid = server_nasid; 61 kvp->kv_rw_nasid = master_nasid; 62 kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid); 63 kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid); 64 printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid); 65} 66 67static __init void copy_kernel(nasid_t dest_nasid) 68{ 69 unsigned long dest_kern_start, source_start, source_end, kern_size; 70 71 source_start = (unsigned long) _stext; 72 source_end = (unsigned long) _etext; 73 kern_size = source_end - source_start; 74 75 dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start), 76 dest_nasid); 77 memcpy((void *)dest_kern_start, (void *)source_start, kern_size); 78} 79 80void __init replicate_kernel_text() 81{ 82 cnodeid_t cnode; 83 nasid_t client_nasid; 84 nasid_t server_nasid; 85 86 server_nasid = master_nasid; 87 88 /* Record where the master node should get its kernel text */ 89 set_ktext_source(master_nasid, master_nasid); 90 91 for_each_online_node(cnode) { 92 if (cnode == 0) 93 continue; 94 client_nasid = COMPACT_TO_NASID_NODEID(cnode); 95 96 /* Check if this node should get a copy of the kernel */ 97 if (cpu_isset(cnode, ktext_repmask)) { 98 server_nasid = client_nasid; 99 copy_kernel(server_nasid); 100 } 101 102 /* Record where this node should get its kernel text */ 103 set_ktext_source(client_nasid, server_nasid); 104 } 105} 106 107/* 108 * Return pfn of first free page of memory on a node. PROM may allocate 109 * data structures on the first couple of pages of the first slot of each 110 * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). 111 */ 112pfn_t node_getfirstfree(cnodeid_t cnode) 113{ 114 unsigned long loadbase = REP_BASE; 115 nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode); 116 unsigned long offset; 117 118#ifdef CONFIG_MAPPED_KERNEL 119 loadbase += 16777216; 120#endif 121 offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase; 122 if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask))) 123 return (TO_NODE(nasid, offset) >> PAGE_SHIFT); 124 else 125 return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> 126 PAGE_SHIFT); 127} 128