2 * acpi_tables.c - ACPI Boot-Time Table Parsing
4 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
36 #define PREFIX "ACPI: "
38 #define ACPI_MAX_TABLES 128
40 static char *mps_inti_flags_polarity
[] = { "dfl", "high", "res", "low" };
41 static char *mps_inti_flags_trigger
[] = { "dfl", "edge", "res", "level" };
43 static struct acpi_table_desc initial_tables
[ACPI_MAX_TABLES
] __initdata
;
45 static int acpi_apic_instance __initdata
;
47 void acpi_table_print_madt_entry(struct acpi_subtable_header
*header
)
52 switch (header
->type
) {
54 case ACPI_MADT_TYPE_LOCAL_APIC
:
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");
65 case ACPI_MADT_TYPE_LOCAL_X2APIC
:
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");
77 case ACPI_MADT_TYPE_IO_APIC
:
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
);
87 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE
:
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]);
97 ~(ACPI_MADT_POLARITY_MASK
| ACPI_MADT_TRIGGER_MASK
))
98 printk(KERN_INFO PREFIX
99 "INT_SRC_OVR unexpected reserved flags: 0x%x\n",
101 ~(ACPI_MADT_POLARITY_MASK
| ACPI_MADT_TRIGGER_MASK
));
106 case ACPI_MADT_TYPE_NMI_SOURCE
:
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],
118 case ACPI_MADT_TYPE_LOCAL_APIC_NMI
:
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",
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],
131 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI
:
133 u16 polarity
, trigger
;
134 struct acpi_madt_local_x2apic_nmi
*p
=
135 (struct acpi_madt_local_x2apic_nmi
*)header
;
137 polarity
= p
->inti_flags
& ACPI_MADT_POLARITY_MASK
;
138 trigger
= (p
->inti_flags
& ACPI_MADT_TRIGGER_MASK
) >> 2;
140 printk(KERN_INFO PREFIX
141 "X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
143 mps_inti_flags_polarity
[polarity
],
144 mps_inti_flags_trigger
[trigger
],
149 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE
:
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
);
159 case ACPI_MADT_TYPE_IO_SAPIC
:
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
,
170 case ACPI_MADT_TYPE_LOCAL_SAPIC
:
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");
181 case ACPI_MADT_TYPE_INTERRUPT_SOURCE
:
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
,
195 printk(KERN_WARNING PREFIX
196 "Found unsupported MADT entry (type = 0x%x)\n",
204 acpi_table_parse_entries(char *id
,
205 unsigned long table_size
,
207 acpi_table_entry_handler handler
,
208 unsigned int max_entries
)
210 struct acpi_table_header
*table_header
= NULL
;
211 struct acpi_subtable_header
*entry
;
212 unsigned int count
= 0;
213 unsigned long table_end
;
218 if (strncmp(id
, ACPI_SIG_MADT
, 4) == 0)
219 acpi_get_table(id
, acpi_apic_instance
, &table_header
);
221 acpi_get_table(id
, 0, &table_header
);
224 printk(KERN_WARNING PREFIX
"%4.4s not present\n", id
);
228 table_end
= (unsigned long)table_header
+ table_header
->length
;
230 /* Parse all entries looking for a match. */
232 entry
= (struct acpi_subtable_header
*)
233 ((unsigned long)table_header
+ table_size
);
235 while (((unsigned long)entry
) + sizeof(struct acpi_subtable_header
) <
237 if (entry
->type
== entry_id
238 && (!max_entries
|| count
++ < max_entries
))
239 if (handler(entry
, table_end
))
242 entry
= (struct acpi_subtable_header
*)
243 ((unsigned long)entry
+ entry
->length
);
245 if (max_entries
&& count
> max_entries
) {
246 printk(KERN_WARNING PREFIX
"[%4.4s:0x%02x] ignored %i entries of "
247 "%i found\n", id
, entry_id
, count
- max_entries
, count
);
254 acpi_table_parse_madt(enum acpi_madt_type id
,
255 acpi_table_entry_handler handler
, unsigned int max_entries
)
257 return acpi_table_parse_entries(ACPI_SIG_MADT
,
258 sizeof(struct acpi_table_madt
), id
,
259 handler
, max_entries
);
263 * acpi_table_parse - find table with @id, run @handler on it
265 * @id: table id to find
266 * @handler: handler to run
268 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
269 * run @handler on it. Return 0 if table found, return on if not.
271 int __init
acpi_table_parse(char *id
, acpi_table_handler handler
)
273 struct acpi_table_header
*table
= NULL
;
278 if (strncmp(id
, ACPI_SIG_MADT
, 4) == 0)
279 acpi_get_table(id
, acpi_apic_instance
, &table
);
281 acpi_get_table(id
, 0, &table
);
291 * The BIOS is supposed to supply a single APIC/MADT,
292 * but some report two. Provide a knob to use either.
293 * (don't you wish instance 0 and 1 were not the same?)
295 static void __init
check_multiple_madt(void)
297 struct acpi_table_header
*table
= NULL
;
299 acpi_get_table(ACPI_SIG_MADT
, 2, &table
);
301 printk(KERN_WARNING PREFIX
302 "BIOS bug: multiple APIC/MADT found,"
303 " using %d\n", acpi_apic_instance
);
304 printk(KERN_WARNING PREFIX
305 "If \"acpi_apic_instance=%d\" works better, "
306 "notify linux-acpi@vger.kernel.org\n",
307 acpi_apic_instance
? 0 : 2);
310 acpi_apic_instance
= 0;
318 * find RSDP, find and checksum SDT/XSDT.
319 * checksum all tables, print SDT/XSDT
321 * result: sdt_entry[] is initialized
324 int __init
acpi_table_init(void)
328 status
= acpi_initialize_tables(initial_tables
, ACPI_MAX_TABLES
, 0);
329 if (ACPI_FAILURE(status
))
332 check_multiple_madt();
336 static int __init
acpi_parse_apic_instance(char *str
)
341 acpi_apic_instance
= simple_strtoul(str
, NULL
, 0);
343 printk(KERN_NOTICE PREFIX
"Shall use APIC/MADT table %d\n",
349 early_param("acpi_apic_instance", acpi_parse_apic_instance
);