1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 /* 26 * Copyright 2019 Peter Tribble. 27 */ 28 29 #include <sys/types.h> 30 #include <sys/param.h> 31 #include <sys/fcntl.h> 32 #include <sys/promif.h> 33 #include <sys/prom_plat.h> 34 #include <sys/salib.h> 35 36 extern int is_sun4v; 37 38 /* 39 * Check if the CPU should default to 64-bit or not. 40 * UltraSPARC-1's default to 32-bit mode. 41 * Everything else defaults to 64-bit mode. 42 */ 43 44 /* 45 * Manufacturer codes for the CPUs we're interested in 46 */ 47 #define TI_JEDEC 0x17 48 #define SUNW_JEDEC 0x22 49 50 /* 51 * Implementation codes for the CPUs we're interested in 52 */ 53 #define IMPL_US_I 0x10 54 55 static pnode_t 56 visit(pnode_t node) 57 { 58 int impl, manu; 59 char name[32]; 60 static char ultrasparc[] = "SUNW,UltraSPARC"; 61 static char implementation[] = "implementation#"; 62 static char manufacturer[] = "manufacturer#"; 63 64 /* 65 * if name isn't 'SUNW,UltraSPARC', continue. 66 */ 67 if (prom_getproplen(node, "name") != sizeof (ultrasparc)) 68 return ((pnode_t)0); 69 (void) prom_getprop(node, "name", name); 70 if (strncmp(name, ultrasparc, sizeof (ultrasparc)) != 0) 71 return ((pnode_t)0); 72 73 if (prom_getproplen(node, manufacturer) != sizeof (int)) 74 return ((pnode_t)0); 75 (void) prom_getprop(node, manufacturer, (caddr_t)&manu); 76 77 if ((manu != SUNW_JEDEC) && (manu != TI_JEDEC)) 78 return ((pnode_t)0); 79 80 if (prom_getproplen(node, implementation) != sizeof (int)) 81 return ((pnode_t)0); 82 (void) prom_getprop(node, implementation, (caddr_t)&impl); 83 84 if (impl != IMPL_US_I) 85 return ((pnode_t)0); 86 87 return (node); 88 } 89 90 /* 91 * visit each node in the device tree, until we get a non-null answer 92 */ 93 static pnode_t 94 walk(pnode_t node) 95 { 96 pnode_t id; 97 98 if (visit(node)) 99 return (node); 100 101 for (node = prom_childnode(node); node; node = prom_nextnode(node)) 102 if ((id = walk(node)) != (pnode_t)0) 103 return (id); 104 105 return ((pnode_t)0); 106 } 107 108 /* 109 * Check if the CPU is an UltraSPARC-1 or not. 110 */ 111 int 112 cpu_is_ultrasparc_1(void) 113 { 114 static int cpu_checked; 115 static int cpu_default; 116 117 /* 118 * If we already checked or the machine is 119 * a sun4v, we already know the answer. 120 */ 121 if (!is_sun4v || cpu_checked == 0) { 122 if (walk(prom_rootnode())) 123 cpu_default = 1; 124 cpu_checked = 1; 125 } 126 127 return (cpu_default); 128 } 129 130 /* 131 * Retain a page or reclaim a previously retained page of physical 132 * memory for use by the prom upgrade. If successful, leave 133 * an indication that a page was retained by creating a boolean 134 * property in the root node. 135 * 136 * XXX: SUNW,retain doesn't work as expected on server systems, 137 * so we don't try to retain any memory on those systems. 138 * 139 * XXX: do a '0 to my-self' as a workaround for 4160914 140 */ 141 142 int dont_retain_memory; 143 144 void 145 retain_nvram_page(void) 146 { 147 unsigned long long phys = 0; 148 int len; 149 char name[32]; 150 static char create_prop[] = 151 "0 to my-self dev / 0 0 \" boot-retained-page\" property"; 152 static char ue[] = "SUNW,Ultra-Enterprise"; 153 extern int verbosemode; 154 155 if (dont_retain_memory) 156 return; 157 158 if (!is_sun4v) { 159 len = prom_getproplen(prom_rootnode(), "name"); 160 if ((len != -1) && (len <= sizeof (name))) { 161 (void) prom_getprop(prom_rootnode(), "name", name); 162 if (strcmp(name, ue) == 0) 163 return; 164 } 165 } 166 167 if (prom_retain("OBPnvram", PAGESIZE, PAGESIZE, &phys) != 0) { 168 printf("prom_retain failed\n"); 169 return; 170 } 171 if (verbosemode) 172 printf("retained OBPnvram page at 0x%llx\n", phys); 173 174 prom_interpret(create_prop, 0, 0, 0, 0, 0); 175 } 176