1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00. 41da177e4SLinus Torvalds * Copyright 2000 - 2001 Silicon Graphics, Inc. 51da177e4SLinus Torvalds * Copyright 2000 - 2001 Kanoj Sarcar (kanoj@sgi.com) 61da177e4SLinus Torvalds */ 71da177e4SLinus Torvalds #include <linux/init.h> 827ac792cSAndrea Righi #include <linux/mm.h> 91da177e4SLinus Torvalds #include <linux/mmzone.h> 101da177e4SLinus Torvalds #include <linux/kernel.h> 111da177e4SLinus Torvalds #include <linux/nodemask.h> 121da177e4SLinus Torvalds #include <linux/string.h> 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds #include <asm/page.h> 151da177e4SLinus Torvalds #include <asm/sections.h> 161da177e4SLinus Torvalds #include <asm/sn/types.h> 171da177e4SLinus Torvalds #include <asm/sn/arch.h> 181da177e4SLinus Torvalds #include <asm/sn/gda.h> 191da177e4SLinus Torvalds #include <asm/sn/hub.h> 201da177e4SLinus Torvalds #include <asm/sn/mapped_kernel.h> 211da177e4SLinus Torvalds #include <asm/sn/sn_private.h> 221da177e4SLinus Torvalds 232d11e6a4SThomas Bogendoerfer static nodemask_t ktext_repmask; 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds /* 261da177e4SLinus Torvalds * XXX - This needs to be much smarter about where it puts copies of the 271da177e4SLinus Torvalds * kernel. For example, we should never put a copy on a headless node, 281da177e4SLinus Torvalds * and we should respect the topology of the machine. 291da177e4SLinus Torvalds */ 30c11b3c1bSRalf Baechle void __init setup_replication_mask(void) 311da177e4SLinus Torvalds { 321da177e4SLinus Torvalds /* Set only the master cnode's bit. The master cnode is always 0. */ 332d11e6a4SThomas Bogendoerfer nodes_clear(ktext_repmask); 342d11e6a4SThomas Bogendoerfer node_set(0, ktext_repmask); 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds #ifdef CONFIG_REPLICATE_KTEXT 371da177e4SLinus Torvalds #ifndef CONFIG_MAPPED_KERNEL 381da177e4SLinus Torvalds #error Kernel replication works with mapped kernel support. No calias support. 391da177e4SLinus Torvalds #endif 4089c96096SRalf Baechle { 414bf841ebSThomas Bogendoerfer nasid_t nasid; 4289c96096SRalf Baechle 434bf841ebSThomas Bogendoerfer for_each_online_node(nasid) { 444bf841ebSThomas Bogendoerfer if (nasid == 0) 451da177e4SLinus Torvalds continue; 461da177e4SLinus Torvalds /* Advertise that we have a copy of the kernel */ 472d11e6a4SThomas Bogendoerfer node_set(nasid, ktext_repmask); 481da177e4SLinus Torvalds } 4989c96096SRalf Baechle } 501da177e4SLinus Torvalds #endif 511da177e4SLinus Torvalds /* Set up a GDA pointer to the replication mask. */ 521da177e4SLinus Torvalds GDA->g_ktext_repmask = &ktext_repmask; 531da177e4SLinus Torvalds } 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid) 571da177e4SLinus Torvalds { 581da177e4SLinus Torvalds kern_vars_t *kvp; 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds kvp = &hub_data(client_nasid)->kern_vars; 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp; 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds kvp->kv_magic = KV_MAGIC; 651da177e4SLinus Torvalds kvp->kv_ro_nasid = server_nasid; 661da177e4SLinus Torvalds kvp->kv_rw_nasid = master_nasid; 671da177e4SLinus Torvalds kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid); 681da177e4SLinus Torvalds kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid); 691da177e4SLinus Torvalds printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid); 701da177e4SLinus Torvalds } 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds /* XXX - When the BTE works, we should use it instead of this. */ 731da177e4SLinus Torvalds static __init void copy_kernel(nasid_t dest_nasid) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds unsigned long dest_kern_start, source_start, source_end, kern_size; 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds source_start = (unsigned long) _stext; 781da177e4SLinus Torvalds source_end = (unsigned long) _etext; 791da177e4SLinus Torvalds kern_size = source_end - source_start; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start), 821da177e4SLinus Torvalds dest_nasid); 831da177e4SLinus Torvalds memcpy((void *)dest_kern_start, (void *)source_start, kern_size); 841da177e4SLinus Torvalds } 851da177e4SLinus Torvalds 8642b76a1dSArnd Bergmann void __init replicate_kernel_text(void) 871da177e4SLinus Torvalds { 881da177e4SLinus Torvalds nasid_t client_nasid; 891da177e4SLinus Torvalds nasid_t server_nasid; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds server_nasid = master_nasid; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds /* Record where the master node should get its kernel text */ 941da177e4SLinus Torvalds set_ktext_source(master_nasid, master_nasid); 951da177e4SLinus Torvalds 964bf841ebSThomas Bogendoerfer for_each_online_node(client_nasid) { 974bf841ebSThomas Bogendoerfer if (client_nasid == 0) 981da177e4SLinus Torvalds continue; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds /* Check if this node should get a copy of the kernel */ 1012d11e6a4SThomas Bogendoerfer if (node_isset(client_nasid, ktext_repmask)) { 1021da177e4SLinus Torvalds server_nasid = client_nasid; 1031da177e4SLinus Torvalds copy_kernel(server_nasid); 1041da177e4SLinus Torvalds } 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds /* Record where this node should get its kernel text */ 1071da177e4SLinus Torvalds set_ktext_source(client_nasid, server_nasid); 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds /* 1121da177e4SLinus Torvalds * Return pfn of first free page of memory on a node. PROM may allocate 1131da177e4SLinus Torvalds * data structures on the first couple of pages of the first slot of each 1141da177e4SLinus Torvalds * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). 1151da177e4SLinus Torvalds */ 1164bf841ebSThomas Bogendoerfer unsigned long node_getfirstfree(nasid_t nasid) 1171da177e4SLinus Torvalds { 1181da177e4SLinus Torvalds unsigned long loadbase = REP_BASE; 1191da177e4SLinus Torvalds unsigned long offset; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds #ifdef CONFIG_MAPPED_KERNEL 1221da177e4SLinus Torvalds loadbase += 16777216; 1231da177e4SLinus Torvalds #endif 1241da177e4SLinus Torvalds offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase; 1252d11e6a4SThomas Bogendoerfer if ((nasid == 0) || (node_isset(nasid, ktext_repmask))) 126635c9907SRalf Baechle return TO_NODE(nasid, offset) >> PAGE_SHIFT; 1271da177e4SLinus Torvalds else 128635c9907SRalf Baechle return KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT; 1291da177e4SLinus Torvalds } 130