| 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 | |
| 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 | void 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_LOCAL_X2APIC: |
| 66 | { |
| 67 | struct acpi_madt_local_x2apic *p = |
| 68 | (struct acpi_madt_local_x2apic *)header; |
| 69 | printk(KERN_INFO PREFIX |
| 70 | "X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", |
| 71 | p->local_apic_id, p->uid, |
| 72 | (p->lapic_flags & ACPI_MADT_ENABLED) ? |
| 73 | "enabled" : "disabled"); |
| 74 | } |
| 75 | break; |
| 76 | |
| 77 | case ACPI_MADT_TYPE_IO_APIC: |
| 78 | { |
| 79 | struct acpi_madt_io_apic *p = |
| 80 | (struct acpi_madt_io_apic *)header; |
| 81 | printk(KERN_INFO PREFIX |
| 82 | "IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", |
| 83 | p->id, p->address, p->global_irq_base); |
| 84 | } |
| 85 | break; |
| 86 | |
| 87 | case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: |
| 88 | { |
| 89 | struct acpi_madt_interrupt_override *p = |
| 90 | (struct acpi_madt_interrupt_override *)header; |
| 91 | printk(KERN_INFO PREFIX |
| 92 | "INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", |
| 93 | p->bus, p->source_irq, p->global_irq, |
| 94 | mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], |
| 95 | mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); |
| 96 | if (p->inti_flags & |
| 97 | ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) |
| 98 | printk(KERN_INFO PREFIX |
| 99 | "INT_SRC_OVR unexpected reserved flags: 0x%x\n", |
| 100 | p->inti_flags & |
| 101 | ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); |
| 102 | |
| 103 | } |
| 104 | break; |
| 105 | |
| 106 | case ACPI_MADT_TYPE_NMI_SOURCE: |
| 107 | { |
| 108 | struct acpi_madt_nmi_source *p = |
| 109 | (struct acpi_madt_nmi_source *)header; |
| 110 | printk(KERN_INFO PREFIX |
| 111 | "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 | printk(KERN_INFO PREFIX |
| 123 | "LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", |
| 124 | p->processor_id, |
| 125 | mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], |
| 126 | mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], |
| 127 | p->lint); |
| 128 | } |
| 129 | break; |
| 130 | |
| 131 | case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: |
| 132 | { |
| 133 | u16 polarity, trigger; |
| 134 | struct acpi_madt_local_x2apic_nmi *p = |
| 135 | (struct acpi_madt_local_x2apic_nmi *)header; |
| 136 | |
| 137 | polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; |
| 138 | trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; |
| 139 | |
| 140 | printk(KERN_INFO PREFIX |
| 141 | "X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", |
| 142 | p->uid, |
| 143 | mps_inti_flags_polarity[polarity], |
| 144 | mps_inti_flags_trigger[trigger], |
| 145 | p->lint); |
| 146 | } |
| 147 | break; |
| 148 | |
| 149 | case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: |
| 150 | { |
| 151 | struct acpi_madt_local_apic_override *p = |
| 152 | (struct acpi_madt_local_apic_override *)header; |
| 153 | printk(KERN_INFO PREFIX |
| 154 | "LAPIC_ADDR_OVR (address[%p])\n", |
| 155 | (void *)(unsigned long)p->address); |
| 156 | } |
| 157 | break; |
| 158 | |
| 159 | case ACPI_MADT_TYPE_IO_SAPIC: |
| 160 | { |
| 161 | struct acpi_madt_io_sapic *p = |
| 162 | (struct acpi_madt_io_sapic *)header; |
| 163 | printk(KERN_INFO PREFIX |
| 164 | "IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", |
| 165 | p->id, (void *)(unsigned long)p->address, |
| 166 | p->global_irq_base); |
| 167 | } |
| 168 | break; |
| 169 | |
| 170 | case ACPI_MADT_TYPE_LOCAL_SAPIC: |
| 171 | { |
| 172 | struct acpi_madt_local_sapic *p = |
| 173 | (struct acpi_madt_local_sapic *)header; |
| 174 | printk(KERN_INFO PREFIX |
| 175 | "LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", |
| 176 | p->processor_id, p->id, p->eid, |
| 177 | (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); |
| 178 | } |
| 179 | break; |
| 180 | |
| 181 | case ACPI_MADT_TYPE_INTERRUPT_SOURCE: |
| 182 | { |
| 183 | struct acpi_madt_interrupt_source *p = |
| 184 | (struct acpi_madt_interrupt_source *)header; |
| 185 | printk(KERN_INFO PREFIX |
| 186 | "PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n", |
| 187 | mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], |
| 188 | mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], |
| 189 | p->type, p->id, p->eid, p->io_sapic_vector, |
| 190 | p->global_irq); |
| 191 | } |
| 192 | break; |
| 193 | |
| 194 | default: |
| 195 | printk(KERN_WARNING PREFIX |
| 196 | "Found unsupported MADT entry (type = 0x%x)\n", |
| 197 | header->type); |
| 198 | break; |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | |
| 203 | int __init |
| 204 | acpi_table_parse_entries(char *id, |
| 205 | unsigned long table_size, |
| 206 | int entry_id, |
| 207 | acpi_tbl_entry_handler handler, |
| 208 | unsigned int max_entries) |
| 209 | { |
| 210 | struct acpi_table_header *table_header = NULL; |
| 211 | struct acpi_subtable_header *entry; |
| 212 | unsigned int count = 0; |
| 213 | unsigned long table_end; |
| 214 | acpi_size tbl_size; |
| 215 | |
| 216 | if (acpi_disabled) |
| 217 | return -ENODEV; |
| 218 | |
| 219 | if (!handler) |
| 220 | return -EINVAL; |
| 221 | |
| 222 | if (strncmp(id, ACPI_SIG_MADT, 4) == 0) |
| 223 | acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size); |
| 224 | else |
| 225 | acpi_get_table_with_size(id, 0, &table_header, &tbl_size); |
| 226 | |
| 227 | if (!table_header) { |
| 228 | printk(KERN_WARNING PREFIX "%4.4s not present\n", id); |
| 229 | return -ENODEV; |
| 230 | } |
| 231 | |
| 232 | table_end = (unsigned long)table_header + table_header->length; |
| 233 | |
| 234 | /* Parse all entries looking for a match. */ |
| 235 | |
| 236 | entry = (struct acpi_subtable_header *) |
| 237 | ((unsigned long)table_header + table_size); |
| 238 | |
| 239 | while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) < |
| 240 | table_end) { |
| 241 | if (entry->type == entry_id |
| 242 | && (!max_entries || count++ < max_entries)) |
| 243 | if (handler(entry, table_end)) |
| 244 | goto err; |
| 245 | |
| 246 | /* |
| 247 | * If entry->length is 0, break from this loop to avoid |
| 248 | * infinite loop. |
| 249 | */ |
| 250 | if (entry->length == 0) { |
| 251 | pr_err(PREFIX "[%4.4s:0x%02x] Invalid zero length\n", id, entry_id); |
| 252 | goto err; |
| 253 | } |
| 254 | |
| 255 | entry = (struct acpi_subtable_header *) |
| 256 | ((unsigned long)entry + entry->length); |
| 257 | } |
| 258 | if (max_entries && count > max_entries) { |
| 259 | printk(KERN_WARNING PREFIX "[%4.4s:0x%02x] ignored %i entries of " |
| 260 | "%i found\n", id, entry_id, count - max_entries, count); |
| 261 | } |
| 262 | |
| 263 | early_acpi_os_unmap_memory((char *)table_header, tbl_size); |
| 264 | return count; |
| 265 | err: |
| 266 | early_acpi_os_unmap_memory((char *)table_header, tbl_size); |
| 267 | return -EINVAL; |
| 268 | } |
| 269 | |
| 270 | int __init |
| 271 | acpi_table_parse_madt(enum acpi_madt_type id, |
| 272 | acpi_tbl_entry_handler handler, unsigned int max_entries) |
| 273 | { |
| 274 | return acpi_table_parse_entries(ACPI_SIG_MADT, |
| 275 | sizeof(struct acpi_table_madt), id, |
| 276 | handler, max_entries); |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * acpi_table_parse - find table with @id, run @handler on it |
| 281 | * |
| 282 | * @id: table id to find |
| 283 | * @handler: handler to run |
| 284 | * |
| 285 | * Scan the ACPI System Descriptor Table (STD) for a table matching @id, |
| 286 | * run @handler on it. Return 0 if table found, return on if not. |
| 287 | */ |
| 288 | int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) |
| 289 | { |
| 290 | struct acpi_table_header *table = NULL; |
| 291 | acpi_size tbl_size; |
| 292 | |
| 293 | if (acpi_disabled) |
| 294 | return -ENODEV; |
| 295 | |
| 296 | if (!handler) |
| 297 | return -EINVAL; |
| 298 | |
| 299 | if (strncmp(id, ACPI_SIG_MADT, 4) == 0) |
| 300 | acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size); |
| 301 | else |
| 302 | acpi_get_table_with_size(id, 0, &table, &tbl_size); |
| 303 | |
| 304 | if (table) { |
| 305 | handler(table); |
| 306 | early_acpi_os_unmap_memory(table, tbl_size); |
| 307 | return 0; |
| 308 | } else |
| 309 | return 1; |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * The BIOS is supposed to supply a single APIC/MADT, |
| 314 | * but some report two. Provide a knob to use either. |
| 315 | * (don't you wish instance 0 and 1 were not the same?) |
| 316 | */ |
| 317 | static void __init check_multiple_madt(void) |
| 318 | { |
| 319 | struct acpi_table_header *table = NULL; |
| 320 | acpi_size tbl_size; |
| 321 | |
| 322 | acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size); |
| 323 | if (table) { |
| 324 | printk(KERN_WARNING PREFIX |
| 325 | "BIOS bug: multiple APIC/MADT found," |
| 326 | " using %d\n", acpi_apic_instance); |
| 327 | printk(KERN_WARNING PREFIX |
| 328 | "If \"acpi_apic_instance=%d\" works better, " |
| 329 | "notify linux-acpi@vger.kernel.org\n", |
| 330 | acpi_apic_instance ? 0 : 2); |
| 331 | early_acpi_os_unmap_memory(table, tbl_size); |
| 332 | |
| 333 | } else |
| 334 | acpi_apic_instance = 0; |
| 335 | |
| 336 | return; |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * acpi_table_init() |
| 341 | * |
| 342 | * find RSDP, find and checksum SDT/XSDT. |
| 343 | * checksum all tables, print SDT/XSDT |
| 344 | * |
| 345 | * result: sdt_entry[] is initialized |
| 346 | */ |
| 347 | |
| 348 | int __init acpi_table_init(void) |
| 349 | { |
| 350 | acpi_status status; |
| 351 | |
| 352 | status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); |
| 353 | if (ACPI_FAILURE(status)) |
| 354 | return 1; |
| 355 | |
| 356 | check_multiple_madt(); |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | static int __init acpi_parse_apic_instance(char *str) |
| 361 | { |
| 362 | if (!str) |
| 363 | return -EINVAL; |
| 364 | |
| 365 | acpi_apic_instance = simple_strtoul(str, NULL, 0); |
| 366 | |
| 367 | printk(KERN_NOTICE PREFIX "Shall use APIC/MADT table %d\n", |
| 368 | acpi_apic_instance); |
| 369 | |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | early_param("acpi_apic_instance", acpi_parse_apic_instance); |