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