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 /* Uncomment next line to get verbose printout */ 27 /* #define DEBUG */ 28 #define pr_fmt(fmt) "ACPI: " fmt 29 30 #include <linux/init.h> 31 #include <linux/kernel.h> 32 #include <linux/smp.h> 33 #include <linux/string.h> 34 #include <linux/types.h> 35 #include <linux/irq.h> 36 #include <linux/errno.h> 37 #include <linux/acpi.h> 38 #include <linux/bootmem.h> 39 40 #define ACPI_MAX_TABLES 128 41 42 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 43 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 44 45 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 46 47 static int acpi_apic_instance __initdata; 48 49 /* 50 * Disable table checksum verification for the early stage due to the size 51 * limitation of the current x86 early mapping implementation. 52 */ 53 static bool acpi_verify_table_checksum __initdata = false; 54 55 void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 56 { 57 if (!header) 58 return; 59 60 switch (header->type) { 61 62 case ACPI_MADT_TYPE_LOCAL_APIC: 63 { 64 struct acpi_madt_local_apic *p = 65 (struct acpi_madt_local_apic *)header; 66 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 67 p->processor_id, p->id, 68 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 69 } 70 break; 71 72 case ACPI_MADT_TYPE_LOCAL_X2APIC: 73 { 74 struct acpi_madt_local_x2apic *p = 75 (struct acpi_madt_local_x2apic *)header; 76 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 77 p->local_apic_id, p->uid, 78 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 79 } 80 break; 81 82 case ACPI_MADT_TYPE_IO_APIC: 83 { 84 struct acpi_madt_io_apic *p = 85 (struct acpi_madt_io_apic *)header; 86 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 87 p->id, p->address, p->global_irq_base); 88 } 89 break; 90 91 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 92 { 93 struct acpi_madt_interrupt_override *p = 94 (struct acpi_madt_interrupt_override *)header; 95 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 96 p->bus, p->source_irq, p->global_irq, 97 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 98 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 99 if (p->inti_flags & 100 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 101 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 102 p->inti_flags & 103 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 104 } 105 break; 106 107 case ACPI_MADT_TYPE_NMI_SOURCE: 108 { 109 struct acpi_madt_nmi_source *p = 110 (struct acpi_madt_nmi_source *)header; 111 pr_info("NMI_SRC (%s %s global_irq %d)\n", 112 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 113 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 114 p->global_irq); 115 } 116 break; 117 118 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 119 { 120 struct acpi_madt_local_apic_nmi *p = 121 (struct acpi_madt_local_apic_nmi *)header; 122 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 123 p->processor_id, 124 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 125 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 126 p->lint); 127 } 128 break; 129 130 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 131 { 132 u16 polarity, trigger; 133 struct acpi_madt_local_x2apic_nmi *p = 134 (struct acpi_madt_local_x2apic_nmi *)header; 135 136 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 137 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 138 139 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 140 p->uid, 141 mps_inti_flags_polarity[polarity], 142 mps_inti_flags_trigger[trigger], 143 p->lint); 144 } 145 break; 146 147 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 148 { 149 struct acpi_madt_local_apic_override *p = 150 (struct acpi_madt_local_apic_override *)header; 151 pr_info("LAPIC_ADDR_OVR (address[%p])\n", 152 (void *)(unsigned long)p->address); 153 } 154 break; 155 156 case ACPI_MADT_TYPE_IO_SAPIC: 157 { 158 struct acpi_madt_io_sapic *p = 159 (struct acpi_madt_io_sapic *)header; 160 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 161 p->id, (void *)(unsigned long)p->address, 162 p->global_irq_base); 163 } 164 break; 165 166 case ACPI_MADT_TYPE_LOCAL_SAPIC: 167 { 168 struct acpi_madt_local_sapic *p = 169 (struct acpi_madt_local_sapic *)header; 170 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 171 p->processor_id, p->id, p->eid, 172 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 173 } 174 break; 175 176 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 177 { 178 struct acpi_madt_interrupt_source *p = 179 (struct acpi_madt_interrupt_source *)header; 180 pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n", 181 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 182 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 183 p->type, p->id, p->eid, p->io_sapic_vector, 184 p->global_irq); 185 } 186 break; 187 188 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 189 { 190 struct acpi_madt_generic_interrupt *p = 191 (struct acpi_madt_generic_interrupt *)header; 192 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 193 p->uid, p->base_address, 194 p->arm_mpidr, 195 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 196 197 } 198 break; 199 200 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 201 { 202 struct acpi_madt_generic_distributor *p = 203 (struct acpi_madt_generic_distributor *)header; 204 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 205 p->gic_id, p->base_address, 206 p->global_irq_base); 207 } 208 break; 209 210 default: 211 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 212 header->type); 213 break; 214 } 215 } 216 217 int __init 218 acpi_parse_entries(char *id, unsigned long table_size, 219 acpi_tbl_entry_handler handler, 220 struct acpi_table_header *table_header, 221 int entry_id, unsigned int max_entries) 222 { 223 struct acpi_subtable_header *entry; 224 int count = 0; 225 unsigned long table_end; 226 227 if (acpi_disabled) 228 return -ENODEV; 229 230 if (!id || !handler) 231 return -EINVAL; 232 233 if (!table_size) 234 return -EINVAL; 235 236 if (!table_header) { 237 pr_warn("%4.4s not present\n", id); 238 return -ENODEV; 239 } 240 241 table_end = (unsigned long)table_header + table_header->length; 242 243 /* Parse all entries looking for a match. */ 244 245 entry = (struct acpi_subtable_header *) 246 ((unsigned long)table_header + table_size); 247 248 while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) < 249 table_end) { 250 if (entry->type == entry_id 251 && (!max_entries || count < max_entries)) { 252 if (handler(entry, table_end)) 253 return -EINVAL; 254 255 count++; 256 } 257 258 /* 259 * If entry->length is 0, break from this loop to avoid 260 * infinite loop. 261 */ 262 if (entry->length == 0) { 263 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id); 264 return -EINVAL; 265 } 266 267 entry = (struct acpi_subtable_header *) 268 ((unsigned long)entry + entry->length); 269 } 270 271 if (max_entries && count > max_entries) { 272 pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n", 273 id, entry_id, count - max_entries, count); 274 } 275 276 return count; 277 } 278 279 int __init 280 acpi_table_parse_entries(char *id, 281 unsigned long table_size, 282 int entry_id, 283 acpi_tbl_entry_handler handler, 284 unsigned int max_entries) 285 { 286 struct acpi_table_header *table_header = NULL; 287 acpi_size tbl_size; 288 int count; 289 u32 instance = 0; 290 291 if (acpi_disabled) 292 return -ENODEV; 293 294 if (!id || !handler) 295 return -EINVAL; 296 297 if (!strncmp(id, ACPI_SIG_MADT, 4)) 298 instance = acpi_apic_instance; 299 300 acpi_get_table_with_size(id, instance, &table_header, &tbl_size); 301 if (!table_header) { 302 pr_warn("%4.4s not present\n", id); 303 return -ENODEV; 304 } 305 306 count = acpi_parse_entries(id, table_size, handler, table_header, 307 entry_id, max_entries); 308 309 early_acpi_os_unmap_memory((char *)table_header, tbl_size); 310 return count; 311 } 312 313 int __init 314 acpi_table_parse_madt(enum acpi_madt_type id, 315 acpi_tbl_entry_handler handler, unsigned int max_entries) 316 { 317 return acpi_table_parse_entries(ACPI_SIG_MADT, 318 sizeof(struct acpi_table_madt), id, 319 handler, max_entries); 320 } 321 322 /** 323 * acpi_table_parse - find table with @id, run @handler on it 324 * @id: table id to find 325 * @handler: handler to run 326 * 327 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 328 * run @handler on it. 329 * 330 * Return 0 if table found, -errno if not. 331 */ 332 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 333 { 334 struct acpi_table_header *table = NULL; 335 acpi_size tbl_size; 336 337 if (acpi_disabled) 338 return -ENODEV; 339 340 if (!id || !handler) 341 return -EINVAL; 342 343 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 344 acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size); 345 else 346 acpi_get_table_with_size(id, 0, &table, &tbl_size); 347 348 if (table) { 349 handler(table); 350 early_acpi_os_unmap_memory(table, tbl_size); 351 return 0; 352 } else 353 return -ENODEV; 354 } 355 356 /* 357 * The BIOS is supposed to supply a single APIC/MADT, 358 * but some report two. Provide a knob to use either. 359 * (don't you wish instance 0 and 1 were not the same?) 360 */ 361 static void __init check_multiple_madt(void) 362 { 363 struct acpi_table_header *table = NULL; 364 acpi_size tbl_size; 365 366 acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size); 367 if (table) { 368 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 369 acpi_apic_instance); 370 pr_warn("If \"acpi_apic_instance=%d\" works better, " 371 "notify linux-acpi@vger.kernel.org\n", 372 acpi_apic_instance ? 0 : 2); 373 early_acpi_os_unmap_memory(table, tbl_size); 374 375 } else 376 acpi_apic_instance = 0; 377 378 return; 379 } 380 381 /* 382 * acpi_table_init() 383 * 384 * find RSDP, find and checksum SDT/XSDT. 385 * checksum all tables, print SDT/XSDT 386 * 387 * result: sdt_entry[] is initialized 388 */ 389 390 int __init acpi_table_init(void) 391 { 392 acpi_status status; 393 394 if (acpi_verify_table_checksum) { 395 pr_info("Early table checksum verification enabled\n"); 396 acpi_gbl_verify_table_checksum = TRUE; 397 } else { 398 pr_info("Early table checksum verification disabled\n"); 399 acpi_gbl_verify_table_checksum = FALSE; 400 } 401 402 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 403 if (ACPI_FAILURE(status)) 404 return -EINVAL; 405 406 check_multiple_madt(); 407 return 0; 408 } 409 410 static int __init acpi_parse_apic_instance(char *str) 411 { 412 if (!str) 413 return -EINVAL; 414 415 if (kstrtoint(str, 0, &acpi_apic_instance)) 416 return -EINVAL; 417 418 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 419 420 return 0; 421 } 422 423 early_param("acpi_apic_instance", acpi_parse_apic_instance); 424 425 static int __init acpi_force_table_verification_setup(char *s) 426 { 427 acpi_verify_table_checksum = true; 428 429 return 0; 430 } 431 432 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 433