1/* 2 * acpi_tables.c - ACPI Boot-Time Table Parsing 3 * 4 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 5 * 6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 23 * 24 */ 25 26#include <linux/init.h> 27#include <linux/kernel.h> 28#include <linux/smp.h> 29#include <linux/string.h> 30#include <linux/types.h> 31#include <linux/irq.h> 32#include <linux/errno.h> 33#include <linux/acpi.h> 34#include <linux/bootmem.h> 35 36#define PREFIX "ACPI: " 37 38#define ACPI_MAX_TABLES 128 39 40static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 41static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 42 43static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 44 45static int acpi_apic_instance __initdata; 46 47void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 48{ 49 if (!header) 50 return; 51 52 switch (header->type) { 53 54 case ACPI_MADT_TYPE_LOCAL_APIC: 55 { 56 struct acpi_madt_local_apic *p = 57 (struct acpi_madt_local_apic *)header; 58 printk(KERN_INFO PREFIX 59 "LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 60 p->processor_id, p->id, 61 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 62 } 63 break; 64 65 case ACPI_MADT_TYPE_IO_APIC: 66 { 67 struct acpi_madt_io_apic *p = 68 (struct acpi_madt_io_apic *)header; 69 printk(KERN_INFO PREFIX 70 "IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 71 p->id, p->address, p->global_irq_base); 72 } 73 break; 74 75 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 76 { 77 struct acpi_madt_interrupt_override *p = 78 (struct acpi_madt_interrupt_override *)header; 79 printk(KERN_INFO PREFIX 80 "INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 81 p->bus, p->source_irq, p->global_irq, 82 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 83 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 84 if (p->inti_flags & 85 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 86 printk(KERN_INFO PREFIX 87 "INT_SRC_OVR unexpected reserved flags: 0x%x\n", 88 p->inti_flags & 89 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 90 91 } 92 break; 93 94 case ACPI_MADT_TYPE_NMI_SOURCE: 95 { 96 struct acpi_madt_nmi_source *p = 97 (struct acpi_madt_nmi_source *)header; 98 printk(KERN_INFO PREFIX 99 "NMI_SRC (%s %s global_irq %d)\n", 100 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 101 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 102 p->global_irq); 103 } 104 break; 105 106 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 107 { 108 struct acpi_madt_local_apic_nmi *p = 109 (struct acpi_madt_local_apic_nmi *)header; 110 printk(KERN_INFO PREFIX 111 "LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 112 p->processor_id, 113 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 114 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 115 p->lint); 116 } 117 break; 118 119 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 120 { 121 struct acpi_madt_local_apic_override *p = 122 (struct acpi_madt_local_apic_override *)header; 123 printk(KERN_INFO PREFIX 124 "LAPIC_ADDR_OVR (address[%p])\n", 125 (void *)(unsigned long)p->address); 126 } 127 break; 128 129 case ACPI_MADT_TYPE_IO_SAPIC: 130 { 131 struct acpi_madt_io_sapic *p = 132 (struct acpi_madt_io_sapic *)header; 133 printk(KERN_INFO PREFIX 134 "IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 135 p->id, (void *)(unsigned long)p->address, 136 p->global_irq_base); 137 } 138 break; 139 140 case ACPI_MADT_TYPE_LOCAL_SAPIC: 141 { 142 struct acpi_madt_local_sapic *p = 143 (struct acpi_madt_local_sapic *)header; 144 printk(KERN_INFO PREFIX 145 "LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 146 p->processor_id, p->id, p->eid, 147 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 148 } 149 break; 150 151 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 152 { 153 struct acpi_madt_interrupt_source *p = 154 (struct acpi_madt_interrupt_source *)header; 155 printk(KERN_INFO PREFIX 156 "PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n", 157 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 158 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 159 p->type, p->id, p->eid, p->io_sapic_vector, 160 p->global_irq); 161 } 162 break; 163 164 default: 165 printk(KERN_WARNING PREFIX 166 "Found unsupported MADT entry (type = 0x%x)\n", 167 header->type); 168 break; 169 } 170} 171 172 173int __init 174acpi_table_parse_entries(char *id, 175 unsigned long table_size, 176 int entry_id, 177 acpi_table_entry_handler handler, 178 unsigned int max_entries) 179{ 180 struct acpi_table_header *table_header = NULL; 181 struct acpi_subtable_header *entry; 182 unsigned int count = 0; 183 unsigned long table_end; 184 185 if (!handler) 186 return -EINVAL; 187 188 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 189 acpi_get_table(id, acpi_apic_instance, &table_header); 190 else 191 acpi_get_table(id, 0, &table_header); 192 193 if (!table_header) { 194 printk(KERN_WARNING PREFIX "%4.4s not present\n", id); 195 return -ENODEV; 196 } 197 198 table_end = (unsigned long)table_header + table_header->length; 199 200 /* Parse all entries looking for a match. */ 201 202 entry = (struct acpi_subtable_header *) 203 ((unsigned long)table_header + table_size); 204 205 while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) < 206 table_end) { 207 if (entry->type == entry_id 208 && (!max_entries || count++ < max_entries)) 209 if (handler(entry, table_end)) 210 return -EINVAL; 211 212 entry = (struct acpi_subtable_header *) 213 ((unsigned long)entry + entry->length); 214 } 215 if (max_entries && count > max_entries) { 216 printk(KERN_WARNING PREFIX "[%4.4s:0x%02x] ignored %i entries of " 217 "%i found\n", id, entry_id, count - max_entries, count); 218 } 219 220 return count; 221} 222 223int __init 224acpi_table_parse_madt(enum acpi_madt_type id, 225 acpi_table_entry_handler handler, unsigned int max_entries) 226{ 227 return acpi_table_parse_entries(ACPI_SIG_MADT, 228 sizeof(struct acpi_table_madt), id, 229 handler, max_entries); 230} 231 232/** 233 * acpi_table_parse - find table with @id, run @handler on it 234 * 235 * @id: table id to find 236 * @handler: handler to run 237 * 238 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 239 * run @handler on it. Return 0 if table found, return on if not. 240 */ 241int __init acpi_table_parse(char *id, acpi_table_handler handler) 242{ 243 struct acpi_table_header *table = NULL; 244 245 if (!handler) 246 return -EINVAL; 247 248 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 249 acpi_get_table(id, acpi_apic_instance, &table); 250 else 251 acpi_get_table(id, 0, &table); 252 253 if (table) { 254 handler(table); 255 return 0; 256 } else 257 return 1; 258} 259 260/* 261 * The BIOS is supposed to supply a single APIC/MADT, 262 * but some report two. Provide a knob to use either. 263 * (don't you wish instance 0 and 1 were not the same?) 264 */ 265static void __init check_multiple_madt(void) 266{ 267 struct acpi_table_header *table = NULL; 268 269 acpi_get_table(ACPI_SIG_MADT, 2, &table); 270 if (table) { 271 printk(KERN_WARNING PREFIX 272 "BIOS bug: multiple APIC/MADT found," 273 " using %d\n", acpi_apic_instance); 274 printk(KERN_WARNING PREFIX 275 "If \"acpi_apic_instance=%d\" works better, " 276 "notify linux-acpi@vger.kernel.org\n", 277 acpi_apic_instance ? 0 : 2); 278 279 } else 280 acpi_apic_instance = 0; 281 282 return; 283} 284 285/* 286 * acpi_table_init() 287 * 288 * find RSDP, find and checksum SDT/XSDT. 289 * checksum all tables, print SDT/XSDT 290 * 291 * result: sdt_entry[] is initialized 292 */ 293 294int __init acpi_table_init(void) 295{ 296 acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 297 check_multiple_madt(); 298 return 0; 299} 300 301static int __init acpi_parse_apic_instance(char *str) 302{ 303 304 acpi_apic_instance = simple_strtoul(str, NULL, 0); 305 306 printk(KERN_NOTICE PREFIX "Shall use APIC/MADT table %d\n", 307 acpi_apic_instance); 308 309 return 0; 310} 311 312early_param("acpi_apic_instance", acpi_parse_apic_instance); 313