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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 early_acpi_os_unmap_memory((char *)table_header, tbl_size);
245 return -EINVAL;
246 }
247
248 entry = (struct acpi_subtable_header *)
249 ((unsigned long)entry + entry->length);
250 }
251 if (max_entries && count > max_entries) {
252 printk(KERN_WARNING PREFIX "[%4.4s:0x%02x] ignored %i entries of "
253 "%i found\n", id, entry_id, count - max_entries, count);
254 }
255
256 early_acpi_os_unmap_memory((char *)table_header, tbl_size);
257 return count;
258}
259
260int __init
261acpi_table_parse_madt(enum acpi_madt_type id,
262 acpi_table_entry_handler handler, unsigned int max_entries)
263{
264 return acpi_table_parse_entries(ACPI_SIG_MADT,
265 sizeof(struct acpi_table_madt), id,
266 handler, max_entries);
267}
268
269/**
270 * acpi_table_parse - find table with @id, run @handler on it
271 *
272 * @id: table id to find
273 * @handler: handler to run
274 *
275 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
276 * run @handler on it. Return 0 if table found, return on if not.
277 */
278int __init acpi_table_parse(char *id, acpi_table_handler handler)
279{
280 struct acpi_table_header *table = NULL;
281 acpi_size tbl_size;
282
283 if (acpi_disabled)
284 return -ENODEV;
285
286 if (!handler)
287 return -EINVAL;
288
289 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
290 acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
291 else
292 acpi_get_table_with_size(id, 0, &table, &tbl_size);
293
294 if (table) {
295 handler(table);
296 early_acpi_os_unmap_memory(table, tbl_size);
297 return 0;
298 } else
299 return 1;
300}
301
302/*
303 * The BIOS is supposed to supply a single APIC/MADT,
304 * but some report two. Provide a knob to use either.
305 * (don't you wish instance 0 and 1 were not the same?)
306 */
307static void __init check_multiple_madt(void)
308{
309 struct acpi_table_header *table = NULL;
310 acpi_size tbl_size;
311
312 acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
313 if (table) {
314 printk(KERN_WARNING PREFIX
315 "BIOS bug: multiple APIC/MADT found,"
316 " using %d\n", acpi_apic_instance);
317 printk(KERN_WARNING PREFIX
318 "If \"acpi_apic_instance=%d\" works better, "
319 "notify linux-acpi@vger.kernel.org\n",
320 acpi_apic_instance ? 0 : 2);
321 early_acpi_os_unmap_memory(table, tbl_size);
322
323 } else
324 acpi_apic_instance = 0;
325
326 return;
327}
328
329/*
330 * acpi_table_init()
331 *
332 * find RSDP, find and checksum SDT/XSDT.
333 * checksum all tables, print SDT/XSDT
334 *
335 * result: sdt_entry[] is initialized
336 */
337
338int __init acpi_table_init(void)
339{
340 acpi_status status;
341
342 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
343 if (ACPI_FAILURE(status))
344 return 1;
345
346 check_multiple_madt();
347 return 0;
348}
349
350static int __init acpi_parse_apic_instance(char *str)
351{
352 if (!str)
353 return -EINVAL;
354
355 acpi_apic_instance = simple_strtoul(str, NULL, 0);
356
357 printk(KERN_NOTICE PREFIX "Shall use APIC/MADT table %d\n",
358 acpi_apic_instance);
359
360 return 0;
361}
362
363early_param("acpi_apic_instance", acpi_parse_apic_instance);
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#define pr_fmt(fmt) "ACPI: " fmt
27
28#include <linux/init.h>
29#include <linux/kernel.h>
30#include <linux/smp.h>
31#include <linux/string.h>
32#include <linux/types.h>
33#include <linux/irq.h>
34#include <linux/errno.h>
35#include <linux/acpi.h>
36#include <linux/bootmem.h>
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 pr_info("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_LOCAL_X2APIC:
65 {
66 struct acpi_madt_local_x2apic *p =
67 (struct acpi_madt_local_x2apic *)header;
68 pr_info("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
69 p->local_apic_id, p->uid,
70 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
71 }
72 break;
73
74 case ACPI_MADT_TYPE_IO_APIC:
75 {
76 struct acpi_madt_io_apic *p =
77 (struct acpi_madt_io_apic *)header;
78 pr_info("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
79 p->id, p->address, p->global_irq_base);
80 }
81 break;
82
83 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
84 {
85 struct acpi_madt_interrupt_override *p =
86 (struct acpi_madt_interrupt_override *)header;
87 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
88 p->bus, p->source_irq, p->global_irq,
89 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
90 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
91 if (p->inti_flags &
92 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
93 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
94 p->inti_flags &
95 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
96 }
97 break;
98
99 case ACPI_MADT_TYPE_NMI_SOURCE:
100 {
101 struct acpi_madt_nmi_source *p =
102 (struct acpi_madt_nmi_source *)header;
103 pr_info("NMI_SRC (%s %s global_irq %d)\n",
104 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
105 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
106 p->global_irq);
107 }
108 break;
109
110 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
111 {
112 struct acpi_madt_local_apic_nmi *p =
113 (struct acpi_madt_local_apic_nmi *)header;
114 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
115 p->processor_id,
116 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
117 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
118 p->lint);
119 }
120 break;
121
122 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
123 {
124 u16 polarity, trigger;
125 struct acpi_madt_local_x2apic_nmi *p =
126 (struct acpi_madt_local_x2apic_nmi *)header;
127
128 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
129 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
130
131 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
132 p->uid,
133 mps_inti_flags_polarity[polarity],
134 mps_inti_flags_trigger[trigger],
135 p->lint);
136 }
137 break;
138
139 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
140 {
141 struct acpi_madt_local_apic_override *p =
142 (struct acpi_madt_local_apic_override *)header;
143 pr_info("LAPIC_ADDR_OVR (address[%p])\n",
144 (void *)(unsigned long)p->address);
145 }
146 break;
147
148 case ACPI_MADT_TYPE_IO_SAPIC:
149 {
150 struct acpi_madt_io_sapic *p =
151 (struct acpi_madt_io_sapic *)header;
152 pr_info("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
153 p->id, (void *)(unsigned long)p->address,
154 p->global_irq_base);
155 }
156 break;
157
158 case ACPI_MADT_TYPE_LOCAL_SAPIC:
159 {
160 struct acpi_madt_local_sapic *p =
161 (struct acpi_madt_local_sapic *)header;
162 pr_info("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
163 p->processor_id, p->id, p->eid,
164 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
165 }
166 break;
167
168 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
169 {
170 struct acpi_madt_interrupt_source *p =
171 (struct acpi_madt_interrupt_source *)header;
172 pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
173 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
174 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
175 p->type, p->id, p->eid, p->io_sapic_vector,
176 p->global_irq);
177 }
178 break;
179
180 default:
181 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
182 header->type);
183 break;
184 }
185}
186
187
188int __init
189acpi_table_parse_entries(char *id,
190 unsigned long table_size,
191 int entry_id,
192 acpi_tbl_entry_handler handler,
193 unsigned int max_entries)
194{
195 struct acpi_table_header *table_header = NULL;
196 struct acpi_subtable_header *entry;
197 unsigned int count = 0;
198 unsigned long table_end;
199 acpi_size tbl_size;
200
201 if (acpi_disabled)
202 return -ENODEV;
203
204 if (!handler)
205 return -EINVAL;
206
207 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
208 acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);
209 else
210 acpi_get_table_with_size(id, 0, &table_header, &tbl_size);
211
212 if (!table_header) {
213 pr_warn("%4.4s not present\n", id);
214 return -ENODEV;
215 }
216
217 table_end = (unsigned long)table_header + table_header->length;
218
219 /* Parse all entries looking for a match. */
220
221 entry = (struct acpi_subtable_header *)
222 ((unsigned long)table_header + table_size);
223
224 while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
225 table_end) {
226 if (entry->type == entry_id
227 && (!max_entries || count++ < max_entries))
228 if (handler(entry, table_end))
229 goto err;
230
231 /*
232 * If entry->length is 0, break from this loop to avoid
233 * infinite loop.
234 */
235 if (entry->length == 0) {
236 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
237 goto err;
238 }
239
240 entry = (struct acpi_subtable_header *)
241 ((unsigned long)entry + entry->length);
242 }
243 if (max_entries && count > max_entries) {
244 pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n",
245 id, entry_id, count - max_entries, count);
246 }
247
248 early_acpi_os_unmap_memory((char *)table_header, tbl_size);
249 return count;
250err:
251 early_acpi_os_unmap_memory((char *)table_header, tbl_size);
252 return -EINVAL;
253}
254
255int __init
256acpi_table_parse_madt(enum acpi_madt_type id,
257 acpi_tbl_entry_handler handler, unsigned int max_entries)
258{
259 return acpi_table_parse_entries(ACPI_SIG_MADT,
260 sizeof(struct acpi_table_madt), id,
261 handler, max_entries);
262}
263
264/**
265 * acpi_table_parse - find table with @id, run @handler on it
266 * @id: table id to find
267 * @handler: handler to run
268 *
269 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
270 * run @handler on it.
271 *
272 * Return 0 if table found, -errno if not.
273 */
274int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
275{
276 struct acpi_table_header *table = NULL;
277 acpi_size tbl_size;
278
279 if (acpi_disabled)
280 return -ENODEV;
281
282 if (!id || !handler)
283 return -EINVAL;
284
285 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
286 acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
287 else
288 acpi_get_table_with_size(id, 0, &table, &tbl_size);
289
290 if (table) {
291 handler(table);
292 early_acpi_os_unmap_memory(table, tbl_size);
293 return 0;
294 } else
295 return -ENODEV;
296}
297
298/*
299 * The BIOS is supposed to supply a single APIC/MADT,
300 * but some report two. Provide a knob to use either.
301 * (don't you wish instance 0 and 1 were not the same?)
302 */
303static void __init check_multiple_madt(void)
304{
305 struct acpi_table_header *table = NULL;
306 acpi_size tbl_size;
307
308 acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
309 if (table) {
310 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
311 acpi_apic_instance);
312 pr_warn("If \"acpi_apic_instance=%d\" works better, "
313 "notify linux-acpi@vger.kernel.org\n",
314 acpi_apic_instance ? 0 : 2);
315 early_acpi_os_unmap_memory(table, tbl_size);
316
317 } else
318 acpi_apic_instance = 0;
319
320 return;
321}
322
323/*
324 * acpi_table_init()
325 *
326 * find RSDP, find and checksum SDT/XSDT.
327 * checksum all tables, print SDT/XSDT
328 *
329 * result: sdt_entry[] is initialized
330 */
331
332int __init acpi_table_init(void)
333{
334 acpi_status status;
335
336 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
337 if (ACPI_FAILURE(status))
338 return -EINVAL;
339
340 check_multiple_madt();
341 return 0;
342}
343
344static int __init acpi_parse_apic_instance(char *str)
345{
346 if (!str)
347 return -EINVAL;
348
349 acpi_apic_instance = simple_strtoul(str, NULL, 0);
350
351 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
352
353 return 0;
354}
355
356early_param("acpi_apic_instance", acpi_parse_apic_instance);