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