drivers/acpi/tables.c

   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_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
 173 int __init
 174 acpi_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
 223 int __init
 224 acpi_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  */
 241 int __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  */
 265 static 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
 294 int __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
 301 static int __init acpi_parse_apic_instance(char *str)
 302 {
 303         if (!str)
 304                 return -EINVAL;
 305
 306         acpi_apic_instance = simple_strtoul(str, NULL, 0);
 307
 308         printk(KERN_NOTICE PREFIX "Shall use APIC/MADT table %d\n",
 309                acpi_apic_instance);
 310
 311         return 0;
 312 }
 313
 314 early_param("acpi_apic_instance", acpi_parse_apic_instance);