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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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19 *
20 */
21
22/* Uncomment next line to get verbose printout */
23/* #define DEBUG */
24#define pr_fmt(fmt) "ACPI: " fmt
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#include <linux/earlycpio.h>
36#include <linux/memblock.h>
37#include <linux/initrd.h>
38#include "internal.h"
39
40#ifdef CONFIG_ACPI_CUSTOM_DSDT
41#include CONFIG_ACPI_CUSTOM_DSDT_FILE
42#endif
43
44#define ACPI_MAX_TABLES 128
45
46static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
47static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
48
49static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
50
51static int acpi_apic_instance __initdata;
52
53/*
54 * Disable table checksum verification for the early stage due to the size
55 * limitation of the current x86 early mapping implementation.
56 */
57static bool acpi_verify_table_checksum __initdata = false;
58
59void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
60{
61 if (!header)
62 return;
63
64 switch (header->type) {
65
66 case ACPI_MADT_TYPE_LOCAL_APIC:
67 {
68 struct acpi_madt_local_apic *p =
69 (struct acpi_madt_local_apic *)header;
70 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
71 p->processor_id, p->id,
72 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
73 }
74 break;
75
76 case ACPI_MADT_TYPE_LOCAL_X2APIC:
77 {
78 struct acpi_madt_local_x2apic *p =
79 (struct acpi_madt_local_x2apic *)header;
80 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
81 p->local_apic_id, p->uid,
82 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
83 }
84 break;
85
86 case ACPI_MADT_TYPE_IO_APIC:
87 {
88 struct acpi_madt_io_apic *p =
89 (struct acpi_madt_io_apic *)header;
90 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
91 p->id, p->address, p->global_irq_base);
92 }
93 break;
94
95 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
96 {
97 struct acpi_madt_interrupt_override *p =
98 (struct acpi_madt_interrupt_override *)header;
99 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
100 p->bus, p->source_irq, p->global_irq,
101 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
102 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
103 if (p->inti_flags &
104 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
105 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
106 p->inti_flags &
107 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
108 }
109 break;
110
111 case ACPI_MADT_TYPE_NMI_SOURCE:
112 {
113 struct acpi_madt_nmi_source *p =
114 (struct acpi_madt_nmi_source *)header;
115 pr_info("NMI_SRC (%s %s global_irq %d)\n",
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->global_irq);
119 }
120 break;
121
122 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
123 {
124 struct acpi_madt_local_apic_nmi *p =
125 (struct acpi_madt_local_apic_nmi *)header;
126 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
127 p->processor_id,
128 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
129 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
130 p->lint);
131 }
132 break;
133
134 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
135 {
136 u16 polarity, trigger;
137 struct acpi_madt_local_x2apic_nmi *p =
138 (struct acpi_madt_local_x2apic_nmi *)header;
139
140 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
141 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
142
143 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
144 p->uid,
145 mps_inti_flags_polarity[polarity],
146 mps_inti_flags_trigger[trigger],
147 p->lint);
148 }
149 break;
150
151 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
152 {
153 struct acpi_madt_local_apic_override *p =
154 (struct acpi_madt_local_apic_override *)header;
155 pr_info("LAPIC_ADDR_OVR (address[%p])\n",
156 (void *)(unsigned long)p->address);
157 }
158 break;
159
160 case ACPI_MADT_TYPE_IO_SAPIC:
161 {
162 struct acpi_madt_io_sapic *p =
163 (struct acpi_madt_io_sapic *)header;
164 pr_debug("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 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
175 p->processor_id, p->id, p->eid,
176 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
177 }
178 break;
179
180 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
181 {
182 struct acpi_madt_interrupt_source *p =
183 (struct acpi_madt_interrupt_source *)header;
184 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",
185 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
186 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
187 p->type, p->id, p->eid, p->io_sapic_vector,
188 p->global_irq);
189 }
190 break;
191
192 case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
193 {
194 struct acpi_madt_generic_interrupt *p =
195 (struct acpi_madt_generic_interrupt *)header;
196 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
197 p->uid, p->base_address,
198 p->arm_mpidr,
199 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
200
201 }
202 break;
203
204 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
205 {
206 struct acpi_madt_generic_distributor *p =
207 (struct acpi_madt_generic_distributor *)header;
208 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
209 p->gic_id, p->base_address,
210 p->global_irq_base);
211 }
212 break;
213
214 default:
215 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
216 header->type);
217 break;
218 }
219}
220
221/**
222 * acpi_parse_entries_array - for each proc_num find a suitable subtable
223 *
224 * @id: table id (for debugging purposes)
225 * @table_size: single entry size
226 * @table_header: where does the table start?
227 * @proc: array of acpi_subtable_proc struct containing entry id
228 * and associated handler with it
229 * @proc_num: how big proc is?
230 * @max_entries: how many entries can we process?
231 *
232 * For each proc_num find a subtable with proc->id and run proc->handler
233 * on it. Assumption is that there's only single handler for particular
234 * entry id.
235 *
236 * On success returns sum of all matching entries for all proc handlers.
237 * Otherwise, -ENODEV or -EINVAL is returned.
238 */
239static int __init
240acpi_parse_entries_array(char *id, unsigned long table_size,
241 struct acpi_table_header *table_header,
242 struct acpi_subtable_proc *proc, int proc_num,
243 unsigned int max_entries)
244{
245 struct acpi_subtable_header *entry;
246 unsigned long table_end;
247 int count = 0;
248 int errs = 0;
249 int i;
250
251 if (acpi_disabled)
252 return -ENODEV;
253
254 if (!id)
255 return -EINVAL;
256
257 if (!table_size)
258 return -EINVAL;
259
260 if (!table_header) {
261 pr_warn("%4.4s not present\n", id);
262 return -ENODEV;
263 }
264
265 table_end = (unsigned long)table_header + table_header->length;
266
267 /* Parse all entries looking for a match. */
268
269 entry = (struct acpi_subtable_header *)
270 ((unsigned long)table_header + table_size);
271
272 while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
273 table_end) {
274 if (max_entries && count >= max_entries)
275 break;
276
277 for (i = 0; i < proc_num; i++) {
278 if (entry->type != proc[i].id)
279 continue;
280 if (!proc[i].handler ||
281 (!errs && proc[i].handler(entry, table_end))) {
282 errs++;
283 continue;
284 }
285
286 proc[i].count++;
287 break;
288 }
289 if (i != proc_num)
290 count++;
291
292 /*
293 * If entry->length is 0, break from this loop to avoid
294 * infinite loop.
295 */
296 if (entry->length == 0) {
297 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
298 return -EINVAL;
299 }
300
301 entry = (struct acpi_subtable_header *)
302 ((unsigned long)entry + entry->length);
303 }
304
305 if (max_entries && count > max_entries) {
306 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
307 id, proc->id, count);
308 }
309
310 return errs ? -EINVAL : count;
311}
312
313int __init
314acpi_table_parse_entries_array(char *id,
315 unsigned long table_size,
316 struct acpi_subtable_proc *proc, int proc_num,
317 unsigned int max_entries)
318{
319 struct acpi_table_header *table_header = NULL;
320 int count;
321 u32 instance = 0;
322
323 if (acpi_disabled)
324 return -ENODEV;
325
326 if (!id)
327 return -EINVAL;
328
329 if (!strncmp(id, ACPI_SIG_MADT, 4))
330 instance = acpi_apic_instance;
331
332 acpi_get_table(id, instance, &table_header);
333 if (!table_header) {
334 pr_warn("%4.4s not present\n", id);
335 return -ENODEV;
336 }
337
338 count = acpi_parse_entries_array(id, table_size, table_header,
339 proc, proc_num, max_entries);
340
341 acpi_put_table(table_header);
342 return count;
343}
344
345int __init
346acpi_table_parse_entries(char *id,
347 unsigned long table_size,
348 int entry_id,
349 acpi_tbl_entry_handler handler,
350 unsigned int max_entries)
351{
352 struct acpi_subtable_proc proc = {
353 .id = entry_id,
354 .handler = handler,
355 };
356
357 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
358 max_entries);
359}
360
361int __init
362acpi_table_parse_madt(enum acpi_madt_type id,
363 acpi_tbl_entry_handler handler, unsigned int max_entries)
364{
365 return acpi_table_parse_entries(ACPI_SIG_MADT,
366 sizeof(struct acpi_table_madt), id,
367 handler, max_entries);
368}
369
370/**
371 * acpi_table_parse - find table with @id, run @handler on it
372 * @id: table id to find
373 * @handler: handler to run
374 *
375 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
376 * run @handler on it.
377 *
378 * Return 0 if table found, -errno if not.
379 */
380int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
381{
382 struct acpi_table_header *table = NULL;
383
384 if (acpi_disabled)
385 return -ENODEV;
386
387 if (!id || !handler)
388 return -EINVAL;
389
390 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
391 acpi_get_table(id, acpi_apic_instance, &table);
392 else
393 acpi_get_table(id, 0, &table);
394
395 if (table) {
396 handler(table);
397 acpi_put_table(table);
398 return 0;
399 } else
400 return -ENODEV;
401}
402
403/*
404 * The BIOS is supposed to supply a single APIC/MADT,
405 * but some report two. Provide a knob to use either.
406 * (don't you wish instance 0 and 1 were not the same?)
407 */
408static void __init check_multiple_madt(void)
409{
410 struct acpi_table_header *table = NULL;
411
412 acpi_get_table(ACPI_SIG_MADT, 2, &table);
413 if (table) {
414 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
415 acpi_apic_instance);
416 pr_warn("If \"acpi_apic_instance=%d\" works better, "
417 "notify linux-acpi@vger.kernel.org\n",
418 acpi_apic_instance ? 0 : 2);
419 acpi_put_table(table);
420
421 } else
422 acpi_apic_instance = 0;
423
424 return;
425}
426
427static void acpi_table_taint(struct acpi_table_header *table)
428{
429 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
430 table->signature, table->oem_table_id);
431 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
432}
433
434#ifdef CONFIG_ACPI_TABLE_UPGRADE
435static u64 acpi_tables_addr;
436static int all_tables_size;
437
438/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
439static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
440{
441 u8 sum = 0;
442 u8 *end = buffer + length;
443
444 while (buffer < end)
445 sum = (u8) (sum + *(buffer++));
446 return sum;
447}
448
449/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
450static const char * const table_sigs[] = {
451 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
452 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
453 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
454 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
455 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
456 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
457 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
458 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
459 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, ACPI_SIG_IORT,
460 ACPI_SIG_NFIT, ACPI_SIG_HMAT, NULL };
461
462#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
463
464#define NR_ACPI_INITRD_TABLES 64
465static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
466static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
467
468#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
469
470void __init acpi_table_upgrade(void)
471{
472 void *data = (void *)initrd_start;
473 size_t size = initrd_end - initrd_start;
474 int sig, no, table_nr = 0, total_offset = 0;
475 long offset = 0;
476 struct acpi_table_header *table;
477 char cpio_path[32] = "kernel/firmware/acpi/";
478 struct cpio_data file;
479
480 if (data == NULL || size == 0)
481 return;
482
483 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
484 file = find_cpio_data(cpio_path, data, size, &offset);
485 if (!file.data)
486 break;
487
488 data += offset;
489 size -= offset;
490
491 if (file.size < sizeof(struct acpi_table_header)) {
492 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
493 cpio_path, file.name);
494 continue;
495 }
496
497 table = file.data;
498
499 for (sig = 0; table_sigs[sig]; sig++)
500 if (!memcmp(table->signature, table_sigs[sig], 4))
501 break;
502
503 if (!table_sigs[sig]) {
504 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
505 cpio_path, file.name);
506 continue;
507 }
508 if (file.size != table->length) {
509 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
510 cpio_path, file.name);
511 continue;
512 }
513 if (acpi_table_checksum(file.data, table->length)) {
514 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
515 cpio_path, file.name);
516 continue;
517 }
518
519 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
520 table->signature, cpio_path, file.name, table->length);
521
522 all_tables_size += table->length;
523 acpi_initrd_files[table_nr].data = file.data;
524 acpi_initrd_files[table_nr].size = file.size;
525 table_nr++;
526 }
527 if (table_nr == 0)
528 return;
529
530 acpi_tables_addr =
531 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS,
532 all_tables_size, PAGE_SIZE);
533 if (!acpi_tables_addr) {
534 WARN_ON(1);
535 return;
536 }
537 /*
538 * Only calling e820_add_reserve does not work and the
539 * tables are invalid (memory got used) later.
540 * memblock_reserve works as expected and the tables won't get modified.
541 * But it's not enough on X86 because ioremap will
542 * complain later (used by acpi_os_map_memory) that the pages
543 * that should get mapped are not marked "reserved".
544 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
545 * works fine.
546 */
547 memblock_reserve(acpi_tables_addr, all_tables_size);
548 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
549
550 /*
551 * early_ioremap only can remap 256k one time. If we map all
552 * tables one time, we will hit the limit. Need to map chunks
553 * one by one during copying the same as that in relocate_initrd().
554 */
555 for (no = 0; no < table_nr; no++) {
556 unsigned char *src_p = acpi_initrd_files[no].data;
557 phys_addr_t size = acpi_initrd_files[no].size;
558 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
559 phys_addr_t slop, clen;
560 char *dest_p;
561
562 total_offset += size;
563
564 while (size) {
565 slop = dest_addr & ~PAGE_MASK;
566 clen = size;
567 if (clen > MAP_CHUNK_SIZE - slop)
568 clen = MAP_CHUNK_SIZE - slop;
569 dest_p = early_memremap(dest_addr & PAGE_MASK,
570 clen + slop);
571 memcpy(dest_p + slop, src_p, clen);
572 early_memunmap(dest_p, clen + slop);
573 src_p += clen;
574 dest_addr += clen;
575 size -= clen;
576 }
577 }
578}
579
580static acpi_status
581acpi_table_initrd_override(struct acpi_table_header *existing_table,
582 acpi_physical_address *address, u32 *length)
583{
584 int table_offset = 0;
585 int table_index = 0;
586 struct acpi_table_header *table;
587 u32 table_length;
588
589 *length = 0;
590 *address = 0;
591 if (!acpi_tables_addr)
592 return AE_OK;
593
594 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
595 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
596 ACPI_HEADER_SIZE);
597 if (table_offset + table->length > all_tables_size) {
598 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
599 WARN_ON(1);
600 return AE_OK;
601 }
602
603 table_length = table->length;
604
605 /* Only override tables matched */
606 if (memcmp(existing_table->signature, table->signature, 4) ||
607 memcmp(table->oem_id, existing_table->oem_id,
608 ACPI_OEM_ID_SIZE) ||
609 memcmp(table->oem_table_id, existing_table->oem_table_id,
610 ACPI_OEM_TABLE_ID_SIZE)) {
611 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
612 goto next_table;
613 }
614 /*
615 * Mark the table to avoid being used in
616 * acpi_table_initrd_scan() and check the revision.
617 */
618 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
619 existing_table->oem_revision >= table->oem_revision) {
620 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
621 goto next_table;
622 }
623
624 *length = table_length;
625 *address = acpi_tables_addr + table_offset;
626 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
627 table->signature, table->oem_id,
628 table->oem_table_id);
629 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
630 break;
631
632next_table:
633 table_offset += table_length;
634 table_index++;
635 }
636 return AE_OK;
637}
638
639static void __init acpi_table_initrd_scan(void)
640{
641 int table_offset = 0;
642 int table_index = 0;
643 u32 table_length;
644 struct acpi_table_header *table;
645
646 if (!acpi_tables_addr)
647 return;
648
649 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
650 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
651 ACPI_HEADER_SIZE);
652 if (table_offset + table->length > all_tables_size) {
653 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
654 WARN_ON(1);
655 return;
656 }
657
658 table_length = table->length;
659
660 /* Skip RSDT/XSDT which should only be used for override */
661 if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) ||
662 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) {
663 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
664 goto next_table;
665 }
666 /*
667 * Mark the table to avoid being used in
668 * acpi_table_initrd_override(). Though this is not possible
669 * because override is disabled in acpi_install_table().
670 */
671 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
672 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
673 goto next_table;
674 }
675
676 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
677 table->signature, table->oem_id,
678 table->oem_table_id);
679 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
680 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
681next_table:
682 table_offset += table_length;
683 table_index++;
684 }
685}
686#else
687static acpi_status
688acpi_table_initrd_override(struct acpi_table_header *existing_table,
689 acpi_physical_address *address,
690 u32 *table_length)
691{
692 *table_length = 0;
693 *address = 0;
694 return AE_OK;
695}
696
697static void __init acpi_table_initrd_scan(void)
698{
699}
700#endif /* CONFIG_ACPI_TABLE_UPGRADE */
701
702acpi_status
703acpi_os_physical_table_override(struct acpi_table_header *existing_table,
704 acpi_physical_address *address,
705 u32 *table_length)
706{
707 return acpi_table_initrd_override(existing_table, address,
708 table_length);
709}
710
711acpi_status
712acpi_os_table_override(struct acpi_table_header *existing_table,
713 struct acpi_table_header **new_table)
714{
715 if (!existing_table || !new_table)
716 return AE_BAD_PARAMETER;
717
718 *new_table = NULL;
719
720#ifdef CONFIG_ACPI_CUSTOM_DSDT
721 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
722 *new_table = (struct acpi_table_header *)AmlCode;
723#endif
724 if (*new_table != NULL)
725 acpi_table_taint(existing_table);
726 return AE_OK;
727}
728
729/*
730 * acpi_table_init()
731 *
732 * find RSDP, find and checksum SDT/XSDT.
733 * checksum all tables, print SDT/XSDT
734 *
735 * result: sdt_entry[] is initialized
736 */
737
738int __init acpi_table_init(void)
739{
740 acpi_status status;
741
742 if (acpi_verify_table_checksum) {
743 pr_info("Early table checksum verification enabled\n");
744 acpi_gbl_enable_table_validation = TRUE;
745 } else {
746 pr_info("Early table checksum verification disabled\n");
747 acpi_gbl_enable_table_validation = FALSE;
748 }
749
750 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
751 if (ACPI_FAILURE(status))
752 return -EINVAL;
753 acpi_table_initrd_scan();
754
755 check_multiple_madt();
756 return 0;
757}
758
759static int __init acpi_parse_apic_instance(char *str)
760{
761 if (!str)
762 return -EINVAL;
763
764 if (kstrtoint(str, 0, &acpi_apic_instance))
765 return -EINVAL;
766
767 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
768
769 return 0;
770}
771
772early_param("acpi_apic_instance", acpi_parse_apic_instance);
773
774static int __init acpi_force_table_verification_setup(char *s)
775{
776 acpi_verify_table_checksum = true;
777
778 return 0;
779}
780
781early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
782
783static int __init acpi_force_32bit_fadt_addr(char *s)
784{
785 pr_info("Forcing 32 Bit FADT addresses\n");
786 acpi_gbl_use32_bit_fadt_addresses = TRUE;
787
788 return 0;
789}
790
791early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);