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 void acpi_table_print_madt_entry(struct acpi_subtable_header * header)
  46 {
  47         if (!header)
  48                 return;
  49
  50         switch (header->type) {
  51
  52         case ACPI_MADT_TYPE_LOCAL_APIC:
  53                 {
  54                         struct acpi_madt_local_apic *p =
  55                             (struct acpi_madt_local_apic *)header;
  56                         printk(KERN_INFO PREFIX
  57                                "LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
  58                                p->processor_id, p->id,
  59                                (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  60                 }
  61                 break;
  62
  63         case ACPI_MADT_TYPE_IO_APIC:
  64                 {
  65                         struct acpi_madt_io_apic *p =
  66                             (struct acpi_madt_io_apic *)header;
  67                         printk(KERN_INFO PREFIX
  68                                "IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
  69                                p->id, p->address, p->global_irq_base);
  70                 }
  71                 break;
  72
  73         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
  74                 {
  75                         struct acpi_madt_interrupt_override *p =
  76                             (struct acpi_madt_interrupt_override *)header;
  77                         printk(KERN_INFO PREFIX
  78                                "INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
  79                                p->bus, p->source_irq, p->global_irq,
  80                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
  81                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
  82                         if (p->inti_flags  &
  83                             ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
  84                                 printk(KERN_INFO PREFIX
  85                                        "INT_SRC_OVR unexpected reserved flags: 0x%x\n",
  86                                        p->inti_flags  &
  87                                         ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
  88
  89                 }
  90                 break;
  91
  92         case ACPI_MADT_TYPE_NMI_SOURCE:
  93                 {
  94                         struct acpi_madt_nmi_source *p =
  95                             (struct acpi_madt_nmi_source *)header;
  96                         printk(KERN_INFO PREFIX
  97                                "NMI_SRC (%s %s global_irq %d)\n",
  98                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
  99                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 100                                p->global_irq);
 101                 }
 102                 break;
 103
 104         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
 105                 {
 106                         struct acpi_madt_local_apic_nmi *p =
 107                             (struct acpi_madt_local_apic_nmi *)header;
 108                         printk(KERN_INFO PREFIX
 109                                "LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
 110                                p->processor_id,
 111                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK  ],
 112                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 113                                p->lint);
 114                 }
 115                 break;
 116
 117         case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
 118                 {
 119                         struct acpi_madt_local_apic_override *p =
 120                             (struct acpi_madt_local_apic_override *)header;
 121                         printk(KERN_INFO PREFIX
 122                                "LAPIC_ADDR_OVR (address[%p])\n",
 123                                (void *)(unsigned long)p->address);
 124                 }
 125                 break;
 126
 127         case ACPI_MADT_TYPE_IO_SAPIC:
 128                 {
 129                         struct acpi_madt_io_sapic *p =
 130                             (struct acpi_madt_io_sapic *)header;
 131                         printk(KERN_INFO PREFIX
 132                                "IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
 133                                p->id, (void *)(unsigned long)p->address,
 134                                p->global_irq_base);
 135                 }
 136                 break;
 137
 138         case ACPI_MADT_TYPE_LOCAL_SAPIC:
 139                 {
 140                         struct acpi_madt_local_sapic *p =
 141                             (struct acpi_madt_local_sapic *)header;
 142                         printk(KERN_INFO PREFIX
 143                                "LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
 144                                p->processor_id, p->id, p->eid,
 145                                (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 146                 }
 147                 break;
 148
 149         case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
 150                 {
 151                         struct acpi_madt_interrupt_source *p =
 152                             (struct acpi_madt_interrupt_source *)header;
 153                         printk(KERN_INFO PREFIX
 154                                "PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
 155                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 156                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 157                                p->type, p->id, p->eid, p->io_sapic_vector,
 158                                p->global_irq);
 159                 }
 160                 break;
 161
 162         default:
 163                 printk(KERN_WARNING PREFIX
 164                        "Found unsupported MADT entry (type = 0x%x)\n",
 165                        header->type);
 166                 break;
 167         }
 168 }
 169
 170
 171 int __init
 172 acpi_table_parse_entries(char *id,
 173                              unsigned long table_size,
 174                              int entry_id,
 175                              acpi_table_entry_handler handler,
 176                              unsigned int max_entries)
 177 {
 178         struct acpi_table_header *table_header = NULL;
 179         struct acpi_subtable_header *entry;
 180         unsigned int count = 0;
 181         unsigned long table_end;
 182
 183         if (!handler)
 184                 return -EINVAL;
 185
 186         /* Locate the table (if exists). There should only be one. */
 187         acpi_get_table(id, 0, &table_header);
 188
 189         if (!table_header) {
 190                 printk(KERN_WARNING PREFIX "%4.4s not present\n", id);
 191                 return -ENODEV;
 192         }
 193
 194         table_end = (unsigned long)table_header + table_header->length;
 195
 196         /* Parse all entries looking for a match. */
 197
 198         entry = (struct acpi_subtable_header *)
 199             ((unsigned long)table_header + table_size);
 200
 201         while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
 202                table_end) {
 203                 if (entry->type == entry_id
 204                     && (!max_entries || count++ < max_entries))
 205                         if (handler(entry, table_end))
 206                                 return -EINVAL;
 207
 208                 entry = (struct acpi_subtable_header *)
 209                     ((unsigned long)entry + entry->length);
 210         }
 211         if (max_entries && count > max_entries) {
 212                 printk(KERN_WARNING PREFIX "[%4.4s:0x%02x] ignored %i entries of "
 213                        "%i found\n", id, entry_id, count - max_entries, count);
 214         }
 215
 216         return count;
 217 }
 218
 219 int __init
 220 acpi_table_parse_madt(enum acpi_madt_type id,
 221                       acpi_table_entry_handler handler, unsigned int max_entries)
 222 {
 223         return acpi_table_parse_entries(ACPI_SIG_MADT,
 224                                             sizeof(struct acpi_table_madt), id,
 225                                             handler, max_entries);
 226 }
 227
 228 /**
 229  * acpi_table_parse - find table with @id, run @handler on it
 230  *
 231  * @id: table id to find
 232  * @handler: handler to run
 233  *
 234  * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 235  * run @handler on it.  Return 0 if table found, return on if not.
 236  */
 237 int __init acpi_table_parse(char *id, acpi_table_handler handler)
 238 {
 239         struct acpi_table_header *table = NULL;
 240         if (!handler)
 241                 return -EINVAL;
 242
 243         acpi_get_table(id, 0, &table);
 244         if (table) {
 245                 handler(table);
 246                 return 0;
 247         } else
 248                 return 1;
 249 }
 250
 251 /*
 252  * acpi_table_init()
 253  *
 254  * find RSDP, find and checksum SDT/XSDT.
 255  * checksum all tables, print SDT/XSDT
 256  *
 257  * result: sdt_entry[] is initialized
 258  */
 259
 260
 261 int __init acpi_table_init(void)
 262 {
 263         acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
 264         return 0;
 265 }