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/sched.h>
  29 #include <linux/smp.h>
  30 #include <linux/string.h>
  31 #include <linux/types.h>
  32 #include <linux/irq.h>
  33 #include <linux/errno.h>
  34 #include <linux/acpi.h>
  35 #include <linux/bootmem.h>
  36
  37 #define PREFIX                  "ACPI: "
  38
  39 #define ACPI_MAX_TABLES         128
  40
  41 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
  42 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
  43
  44 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
  45
  46 void acpi_table_print_madt_entry(struct acpi_subtable_header * header)
  47 {
  48         if (!header)
  49                 return;
  50
  51         switch (header->type) {
  52
  53         case ACPI_MADT_TYPE_LOCAL_APIC:
  54                 {
  55                         struct acpi_madt_local_apic *p =
  56                             (struct acpi_madt_local_apic *)header;
  57                         printk(KERN_INFO PREFIX
  58                                "LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
  59                                p->processor_id, p->id,
  60                                (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  61                 }
  62                 break;
  63
  64         case ACPI_MADT_TYPE_IO_APIC:
  65                 {
  66                         struct acpi_madt_io_apic *p =
  67                             (struct acpi_madt_io_apic *)header;
  68                         printk(KERN_INFO PREFIX
  69                                "IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
  70                                p->id, p->address, p->global_irq_base);
  71                 }
  72                 break;
  73
  74         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
  75                 {
  76                         struct acpi_madt_interrupt_override *p =
  77                             (struct acpi_madt_interrupt_override *)header;
  78                         printk(KERN_INFO PREFIX
  79                                "INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
  80                                p->bus, p->source_irq, p->global_irq,
  81                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
  82                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
  83                         if (p->inti_flags  &
  84                             ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
  85                                 printk(KERN_INFO PREFIX
  86                                        "INT_SRC_OVR unexpected reserved flags: 0x%x\n",
  87                                        p->inti_flags  &
  88                                         ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
  89
  90                 }
  91                 break;
  92
  93         case ACPI_MADT_TYPE_NMI_SOURCE:
  94                 {
  95                         struct acpi_madt_nmi_source *p =
  96                             (struct acpi_madt_nmi_source *)header;
  97                         printk(KERN_INFO PREFIX
  98                                "NMI_SRC (%s %s global_irq %d)\n",
  99                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 100                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 101                                p->global_irq);
 102                 }
 103                 break;
 104
 105         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
 106                 {
 107                         struct acpi_madt_local_apic_nmi *p =
 108                             (struct acpi_madt_local_apic_nmi *)header;
 109                         printk(KERN_INFO PREFIX
 110                                "LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
 111                                p->processor_id,
 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->lint);
 115                 }
 116                 break;
 117
 118         case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
 119                 {
 120                         struct acpi_madt_local_apic_override *p =
 121                             (struct acpi_madt_local_apic_override *)header;
 122                         printk(KERN_INFO PREFIX
 123                                "LAPIC_ADDR_OVR (address[%p])\n",
 124                                (void *)(unsigned long)p->address);
 125                 }
 126                 break;
 127
 128         case ACPI_MADT_TYPE_IO_SAPIC:
 129                 {
 130                         struct acpi_madt_io_sapic *p =
 131                             (struct acpi_madt_io_sapic *)header;
 132                         printk(KERN_INFO PREFIX
 133                                "IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
 134                                p->id, (void *)(unsigned long)p->address,
 135                                p->global_irq_base);
 136                 }
 137                 break;
 138
 139         case ACPI_MADT_TYPE_LOCAL_SAPIC:
 140                 {
 141                         struct acpi_madt_local_sapic *p =
 142                             (struct acpi_madt_local_sapic *)header;
 143                         printk(KERN_INFO PREFIX
 144                                "LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
 145                                p->processor_id, p->id, p->eid,
 146                                (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 147                 }
 148                 break;
 149
 150         case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
 151                 {
 152                         struct acpi_madt_interrupt_source *p =
 153                             (struct acpi_madt_interrupt_source *)header;
 154                         printk(KERN_INFO PREFIX
 155                                "PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
 156                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 157                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 158                                p->type, p->id, p->eid, p->io_sapic_vector,
 159                                p->global_irq);
 160                 }
 161                 break;
 162
 163         default:
 164                 printk(KERN_WARNING PREFIX
 165                        "Found unsupported MADT entry (type = 0x%x)\n",
 166                        header->type);
 167                 break;
 168         }
 169 }
 170
 171
 172 int __init
 173 acpi_table_parse_entries(char *id,
 174                              unsigned long table_size,
 175                              int entry_id,
 176                              acpi_table_entry_handler handler,
 177                              unsigned int max_entries)
 178 {
 179         struct acpi_table_header *table_header = NULL;
 180         struct acpi_subtable_header *entry;
 181         unsigned int count = 0;
 182         unsigned long table_end;
 183
 184         if (!handler)
 185                 return -EINVAL;
 186
 187         /* Locate the table (if exists). There should only be one. */
 188         acpi_get_table(id, 0, &table_header);
 189
 190         if (!table_header) {
 191                 printk(KERN_WARNING PREFIX "%4.4s not present\n", id);
 192                 return -ENODEV;
 193         }
 194
 195         table_end = (unsigned long)table_header + table_header->length;
 196
 197         /* Parse all entries looking for a match. */
 198
 199         entry = (struct acpi_subtable_header *)
 200             ((unsigned long)table_header + table_size);
 201
 202         while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
 203                table_end) {
 204                 if (entry->type == entry_id
 205                     && (!max_entries || count++ < max_entries))
 206                         if (handler(entry, table_end))
 207                                 return -EINVAL;
 208
 209                 entry = (struct acpi_subtable_header *)
 210                     ((unsigned long)entry + entry->length);
 211         }
 212         if (max_entries && count > max_entries) {
 213                 printk(KERN_WARNING PREFIX "[%4.4s:0x%02x] ignored %i entries of "
 214                        "%i found\n", id, entry_id, count - max_entries, count);
 215         }
 216
 217         return count;
 218 }
 219
 220 int __init
 221 acpi_table_parse_madt(enum acpi_madt_type id,
 222                       acpi_table_entry_handler handler, unsigned int max_entries)
 223 {
 224         return acpi_table_parse_entries(ACPI_SIG_MADT,
 225                                             sizeof(struct acpi_table_madt), id,
 226                                             handler, max_entries);
 227 }
 228
 229 /**
 230  * acpi_table_parse - find table with @id, run @handler on it
 231  *
 232  * @id: table id to find
 233  * @handler: handler to run
 234  *
 235  * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 236  * run @handler on it.  Return 0 if table found, return on if not.
 237  */
 238 int __init acpi_table_parse(char *id, acpi_table_handler handler)
 239 {
 240         struct acpi_table_header *table = NULL;
 241         if (!handler)
 242                 return -EINVAL;
 243
 244         acpi_get_table(id, 0, &table);
 245         if (table) {
 246                 handler(table);
 247                 return 0;
 248         } else
 249                 return 1;
 250 }
 251
 252 /*
 253  * acpi_table_init()
 254  *
 255  * find RSDP, find and checksum SDT/XSDT.
 256  * checksum all tables, print SDT/XSDT
 257  *
 258  * result: sdt_entry[] is initialized
 259  */
 260
 261
 262 int __init acpi_table_init(void)
 263 {
 264         acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
 265         return 0;
 266 }