linux/drivers/acpi/tables.c
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   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_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
 203int __init
 204acpi_table_parse_entries(char *id,
 205                             unsigned long table_size,
 206                             int entry_id,
 207                             acpi_table_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;
 265err:
 266        early_acpi_os_unmap_memory((char *)table_header, tbl_size);
 267        return -EINVAL;
 268}
 269
 270int __init
 271acpi_table_parse_madt(enum acpi_madt_type id,
 272                      acpi_table_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 */
 288int __init acpi_table_parse(char *id, acpi_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 */
 317static 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
 348int __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
 360static 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
 373early_param("acpi_apic_instance", acpi_parse_apic_instance);
 374
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