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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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_tables.c - ACPI Boot-Time Table Parsing
4 *
5 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 */
7
8/* Uncomment next line to get verbose printout */
9/* #define DEBUG */
10#define pr_fmt(fmt) "ACPI: " fmt
11
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/smp.h>
15#include <linux/string.h>
16#include <linux/types.h>
17#include <linux/irq.h>
18#include <linux/errno.h>
19#include <linux/acpi.h>
20#include <linux/memblock.h>
21#include <linux/earlycpio.h>
22#include <linux/initrd.h>
23#include <linux/security.h>
24#include "internal.h"
25
26#ifdef CONFIG_ACPI_CUSTOM_DSDT
27#include CONFIG_ACPI_CUSTOM_DSDT_FILE
28#endif
29
30#define ACPI_MAX_TABLES 128
31
32static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
33static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
34
35static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
36
37static int acpi_apic_instance __initdata;
38
39enum acpi_subtable_type {
40 ACPI_SUBTABLE_COMMON,
41 ACPI_SUBTABLE_HMAT,
42 ACPI_SUBTABLE_PRMT,
43};
44
45struct acpi_subtable_entry {
46 union acpi_subtable_headers *hdr;
47 enum acpi_subtable_type type;
48};
49
50/*
51 * Disable table checksum verification for the early stage due to the size
52 * limitation of the current x86 early mapping implementation.
53 */
54static bool acpi_verify_table_checksum __initdata = false;
55
56void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
57{
58 if (!header)
59 return;
60
61 switch (header->type) {
62
63 case ACPI_MADT_TYPE_LOCAL_APIC:
64 {
65 struct acpi_madt_local_apic *p =
66 (struct acpi_madt_local_apic *)header;
67 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
68 p->processor_id, p->id,
69 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
70 }
71 break;
72
73 case ACPI_MADT_TYPE_LOCAL_X2APIC:
74 {
75 struct acpi_madt_local_x2apic *p =
76 (struct acpi_madt_local_x2apic *)header;
77 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
78 p->local_apic_id, p->uid,
79 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
80 }
81 break;
82
83 case ACPI_MADT_TYPE_IO_APIC:
84 {
85 struct acpi_madt_io_apic *p =
86 (struct acpi_madt_io_apic *)header;
87 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
88 p->id, p->address, p->global_irq_base);
89 }
90 break;
91
92 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
93 {
94 struct acpi_madt_interrupt_override *p =
95 (struct acpi_madt_interrupt_override *)header;
96 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
97 p->bus, p->source_irq, p->global_irq,
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 if (p->inti_flags &
101 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
102 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
103 p->inti_flags &
104 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
105 }
106 break;
107
108 case ACPI_MADT_TYPE_NMI_SOURCE:
109 {
110 struct acpi_madt_nmi_source *p =
111 (struct acpi_madt_nmi_source *)header;
112 pr_info("NMI_SRC (%s %s global_irq %d)\n",
113 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
114 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
115 p->global_irq);
116 }
117 break;
118
119 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
120 {
121 struct acpi_madt_local_apic_nmi *p =
122 (struct acpi_madt_local_apic_nmi *)header;
123 pr_info("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 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
141 p->uid,
142 mps_inti_flags_polarity[polarity],
143 mps_inti_flags_trigger[trigger],
144 p->lint);
145 }
146 break;
147
148 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
149 {
150 struct acpi_madt_local_apic_override *p =
151 (struct acpi_madt_local_apic_override *)header;
152 pr_info("LAPIC_ADDR_OVR (address[%p])\n",
153 (void *)(unsigned long)p->address);
154 }
155 break;
156
157 case ACPI_MADT_TYPE_IO_SAPIC:
158 {
159 struct acpi_madt_io_sapic *p =
160 (struct acpi_madt_io_sapic *)header;
161 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
162 p->id, (void *)(unsigned long)p->address,
163 p->global_irq_base);
164 }
165 break;
166
167 case ACPI_MADT_TYPE_LOCAL_SAPIC:
168 {
169 struct acpi_madt_local_sapic *p =
170 (struct acpi_madt_local_sapic *)header;
171 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
172 p->processor_id, p->id, p->eid,
173 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
174 }
175 break;
176
177 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
178 {
179 struct acpi_madt_interrupt_source *p =
180 (struct acpi_madt_interrupt_source *)header;
181 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",
182 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
183 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
184 p->type, p->id, p->eid, p->io_sapic_vector,
185 p->global_irq);
186 }
187 break;
188
189 case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
190 {
191 struct acpi_madt_generic_interrupt *p =
192 (struct acpi_madt_generic_interrupt *)header;
193 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
194 p->uid, p->base_address,
195 p->arm_mpidr,
196 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
197
198 }
199 break;
200
201 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
202 {
203 struct acpi_madt_generic_distributor *p =
204 (struct acpi_madt_generic_distributor *)header;
205 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
206 p->gic_id, p->base_address,
207 p->global_irq_base);
208 }
209 break;
210
211 default:
212 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
213 header->type);
214 break;
215 }
216}
217
218static unsigned long __init
219acpi_get_entry_type(struct acpi_subtable_entry *entry)
220{
221 switch (entry->type) {
222 case ACPI_SUBTABLE_COMMON:
223 return entry->hdr->common.type;
224 case ACPI_SUBTABLE_HMAT:
225 return entry->hdr->hmat.type;
226 case ACPI_SUBTABLE_PRMT:
227 return 0;
228 }
229 return 0;
230}
231
232static unsigned long __init
233acpi_get_entry_length(struct acpi_subtable_entry *entry)
234{
235 switch (entry->type) {
236 case ACPI_SUBTABLE_COMMON:
237 return entry->hdr->common.length;
238 case ACPI_SUBTABLE_HMAT:
239 return entry->hdr->hmat.length;
240 case ACPI_SUBTABLE_PRMT:
241 return entry->hdr->prmt.length;
242 }
243 return 0;
244}
245
246static unsigned long __init
247acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
248{
249 switch (entry->type) {
250 case ACPI_SUBTABLE_COMMON:
251 return sizeof(entry->hdr->common);
252 case ACPI_SUBTABLE_HMAT:
253 return sizeof(entry->hdr->hmat);
254 case ACPI_SUBTABLE_PRMT:
255 return sizeof(entry->hdr->prmt);
256 }
257 return 0;
258}
259
260static enum acpi_subtable_type __init
261acpi_get_subtable_type(char *id)
262{
263 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
264 return ACPI_SUBTABLE_HMAT;
265 if (strncmp(id, ACPI_SIG_PRMT, 4) == 0)
266 return ACPI_SUBTABLE_PRMT;
267 return ACPI_SUBTABLE_COMMON;
268}
269
270/**
271 * acpi_parse_entries_array - for each proc_num find a suitable subtable
272 *
273 * @id: table id (for debugging purposes)
274 * @table_size: size of the root table
275 * @table_header: where does the table start?
276 * @proc: array of acpi_subtable_proc struct containing entry id
277 * and associated handler with it
278 * @proc_num: how big proc is?
279 * @max_entries: how many entries can we process?
280 *
281 * For each proc_num find a subtable with proc->id and run proc->handler
282 * on it. Assumption is that there's only single handler for particular
283 * entry id.
284 *
285 * The table_size is not the size of the complete ACPI table (the length
286 * field in the header struct), but only the size of the root table; i.e.,
287 * the offset from the very first byte of the complete ACPI table, to the
288 * first byte of the very first subtable.
289 *
290 * On success returns sum of all matching entries for all proc handlers.
291 * Otherwise, -ENODEV or -EINVAL is returned.
292 */
293static int __init acpi_parse_entries_array(char *id, unsigned long table_size,
294 struct acpi_table_header *table_header,
295 struct acpi_subtable_proc *proc, int proc_num,
296 unsigned int max_entries)
297{
298 struct acpi_subtable_entry entry;
299 unsigned long table_end, subtable_len, entry_len;
300 int count = 0;
301 int errs = 0;
302 int i;
303
304 table_end = (unsigned long)table_header + table_header->length;
305
306 /* Parse all entries looking for a match. */
307
308 entry.type = acpi_get_subtable_type(id);
309 entry.hdr = (union acpi_subtable_headers *)
310 ((unsigned long)table_header + table_size);
311 subtable_len = acpi_get_subtable_header_length(&entry);
312
313 while (((unsigned long)entry.hdr) + subtable_len < table_end) {
314 if (max_entries && count >= max_entries)
315 break;
316
317 for (i = 0; i < proc_num; i++) {
318 if (acpi_get_entry_type(&entry) != proc[i].id)
319 continue;
320 if (!proc[i].handler ||
321 (!errs && proc[i].handler(entry.hdr, table_end))) {
322 errs++;
323 continue;
324 }
325
326 proc[i].count++;
327 break;
328 }
329 if (i != proc_num)
330 count++;
331
332 /*
333 * If entry->length is 0, break from this loop to avoid
334 * infinite loop.
335 */
336 entry_len = acpi_get_entry_length(&entry);
337 if (entry_len == 0) {
338 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
339 return -EINVAL;
340 }
341
342 entry.hdr = (union acpi_subtable_headers *)
343 ((unsigned long)entry.hdr + entry_len);
344 }
345
346 if (max_entries && count > max_entries) {
347 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
348 id, proc->id, count);
349 }
350
351 return errs ? -EINVAL : count;
352}
353
354int __init acpi_table_parse_entries_array(char *id,
355 unsigned long table_size,
356 struct acpi_subtable_proc *proc, int proc_num,
357 unsigned int max_entries)
358{
359 struct acpi_table_header *table_header = NULL;
360 int count;
361 u32 instance = 0;
362
363 if (acpi_disabled)
364 return -ENODEV;
365
366 if (!id)
367 return -EINVAL;
368
369 if (!table_size)
370 return -EINVAL;
371
372 if (!strncmp(id, ACPI_SIG_MADT, 4))
373 instance = acpi_apic_instance;
374
375 acpi_get_table(id, instance, &table_header);
376 if (!table_header) {
377 pr_warn("%4.4s not present\n", id);
378 return -ENODEV;
379 }
380
381 count = acpi_parse_entries_array(id, table_size, table_header,
382 proc, proc_num, max_entries);
383
384 acpi_put_table(table_header);
385 return count;
386}
387
388int __init acpi_table_parse_entries(char *id,
389 unsigned long table_size,
390 int entry_id,
391 acpi_tbl_entry_handler handler,
392 unsigned int max_entries)
393{
394 struct acpi_subtable_proc proc = {
395 .id = entry_id,
396 .handler = handler,
397 };
398
399 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
400 max_entries);
401}
402
403int __init acpi_table_parse_madt(enum acpi_madt_type id,
404 acpi_tbl_entry_handler handler, unsigned int max_entries)
405{
406 return acpi_table_parse_entries(ACPI_SIG_MADT,
407 sizeof(struct acpi_table_madt), id,
408 handler, max_entries);
409}
410
411/**
412 * acpi_table_parse - find table with @id, run @handler on it
413 * @id: table id to find
414 * @handler: handler to run
415 *
416 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
417 * run @handler on it.
418 *
419 * Return 0 if table found, -errno if not.
420 */
421int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
422{
423 struct acpi_table_header *table = NULL;
424
425 if (acpi_disabled)
426 return -ENODEV;
427
428 if (!id || !handler)
429 return -EINVAL;
430
431 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
432 acpi_get_table(id, acpi_apic_instance, &table);
433 else
434 acpi_get_table(id, 0, &table);
435
436 if (table) {
437 handler(table);
438 acpi_put_table(table);
439 return 0;
440 } else
441 return -ENODEV;
442}
443
444/*
445 * The BIOS is supposed to supply a single APIC/MADT,
446 * but some report two. Provide a knob to use either.
447 * (don't you wish instance 0 and 1 were not the same?)
448 */
449static void __init check_multiple_madt(void)
450{
451 struct acpi_table_header *table = NULL;
452
453 acpi_get_table(ACPI_SIG_MADT, 2, &table);
454 if (table) {
455 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
456 acpi_apic_instance);
457 pr_warn("If \"acpi_apic_instance=%d\" works better, "
458 "notify linux-acpi@vger.kernel.org\n",
459 acpi_apic_instance ? 0 : 2);
460 acpi_put_table(table);
461
462 } else
463 acpi_apic_instance = 0;
464
465 return;
466}
467
468static void acpi_table_taint(struct acpi_table_header *table)
469{
470 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
471 table->signature, table->oem_table_id);
472 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
473}
474
475#ifdef CONFIG_ACPI_TABLE_UPGRADE
476static u64 acpi_tables_addr;
477static int all_tables_size;
478
479/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
480static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
481{
482 u8 sum = 0;
483 u8 *end = buffer + length;
484
485 while (buffer < end)
486 sum = (u8) (sum + *(buffer++));
487 return sum;
488}
489
490/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
491static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
492 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
493 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
494 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
495 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
496 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
497 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
498 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
499 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
500 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
501 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
502 ACPI_SIG_NHLT };
503
504#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
505
506#define NR_ACPI_INITRD_TABLES 64
507static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
508static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
509
510#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
511
512void __init acpi_table_upgrade(void)
513{
514 void *data;
515 size_t size;
516 int sig, no, table_nr = 0, total_offset = 0;
517 long offset = 0;
518 struct acpi_table_header *table;
519 char cpio_path[32] = "kernel/firmware/acpi/";
520 struct cpio_data file;
521
522 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
523 data = __initramfs_start;
524 size = __initramfs_size;
525 } else {
526 data = (void *)initrd_start;
527 size = initrd_end - initrd_start;
528 }
529
530 if (data == NULL || size == 0)
531 return;
532
533 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
534 file = find_cpio_data(cpio_path, data, size, &offset);
535 if (!file.data)
536 break;
537
538 data += offset;
539 size -= offset;
540
541 if (file.size < sizeof(struct acpi_table_header)) {
542 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
543 cpio_path, file.name);
544 continue;
545 }
546
547 table = file.data;
548
549 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
550 if (!memcmp(table->signature, table_sigs[sig], 4))
551 break;
552
553 if (sig >= ARRAY_SIZE(table_sigs)) {
554 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
555 cpio_path, file.name);
556 continue;
557 }
558 if (file.size != table->length) {
559 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
560 cpio_path, file.name);
561 continue;
562 }
563 if (acpi_table_checksum(file.data, table->length)) {
564 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
565 cpio_path, file.name);
566 continue;
567 }
568
569 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
570 table->signature, cpio_path, file.name, table->length);
571
572 all_tables_size += table->length;
573 acpi_initrd_files[table_nr].data = file.data;
574 acpi_initrd_files[table_nr].size = file.size;
575 table_nr++;
576 }
577 if (table_nr == 0)
578 return;
579
580 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
581 pr_notice("kernel is locked down, ignoring table override\n");
582 return;
583 }
584
585 acpi_tables_addr =
586 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS,
587 all_tables_size, PAGE_SIZE);
588 if (!acpi_tables_addr) {
589 WARN_ON(1);
590 return;
591 }
592 /*
593 * Only calling e820_add_reserve does not work and the
594 * tables are invalid (memory got used) later.
595 * memblock_reserve works as expected and the tables won't get modified.
596 * But it's not enough on X86 because ioremap will
597 * complain later (used by acpi_os_map_memory) that the pages
598 * that should get mapped are not marked "reserved".
599 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
600 * works fine.
601 */
602 memblock_reserve(acpi_tables_addr, all_tables_size);
603 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
604
605 /*
606 * early_ioremap only can remap 256k one time. If we map all
607 * tables one time, we will hit the limit. Need to map chunks
608 * one by one during copying the same as that in relocate_initrd().
609 */
610 for (no = 0; no < table_nr; no++) {
611 unsigned char *src_p = acpi_initrd_files[no].data;
612 phys_addr_t size = acpi_initrd_files[no].size;
613 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
614 phys_addr_t slop, clen;
615 char *dest_p;
616
617 total_offset += size;
618
619 while (size) {
620 slop = dest_addr & ~PAGE_MASK;
621 clen = size;
622 if (clen > MAP_CHUNK_SIZE - slop)
623 clen = MAP_CHUNK_SIZE - slop;
624 dest_p = early_memremap(dest_addr & PAGE_MASK,
625 clen + slop);
626 memcpy(dest_p + slop, src_p, clen);
627 early_memunmap(dest_p, clen + slop);
628 src_p += clen;
629 dest_addr += clen;
630 size -= clen;
631 }
632 }
633}
634
635static acpi_status
636acpi_table_initrd_override(struct acpi_table_header *existing_table,
637 acpi_physical_address *address, u32 *length)
638{
639 int table_offset = 0;
640 int table_index = 0;
641 struct acpi_table_header *table;
642 u32 table_length;
643
644 *length = 0;
645 *address = 0;
646 if (!acpi_tables_addr)
647 return AE_OK;
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 AE_OK;
656 }
657
658 table_length = table->length;
659
660 /* Only override tables matched */
661 if (memcmp(existing_table->signature, table->signature, 4) ||
662 memcmp(table->oem_id, existing_table->oem_id,
663 ACPI_OEM_ID_SIZE) ||
664 memcmp(table->oem_table_id, existing_table->oem_table_id,
665 ACPI_OEM_TABLE_ID_SIZE)) {
666 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
667 goto next_table;
668 }
669 /*
670 * Mark the table to avoid being used in
671 * acpi_table_initrd_scan() and check the revision.
672 */
673 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
674 existing_table->oem_revision >= table->oem_revision) {
675 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
676 goto next_table;
677 }
678
679 *length = table_length;
680 *address = acpi_tables_addr + table_offset;
681 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
682 table->signature, table->oem_id,
683 table->oem_table_id);
684 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
685 break;
686
687next_table:
688 table_offset += table_length;
689 table_index++;
690 }
691 return AE_OK;
692}
693
694static void __init acpi_table_initrd_scan(void)
695{
696 int table_offset = 0;
697 int table_index = 0;
698 u32 table_length;
699 struct acpi_table_header *table;
700
701 if (!acpi_tables_addr)
702 return;
703
704 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
705 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
706 ACPI_HEADER_SIZE);
707 if (table_offset + table->length > all_tables_size) {
708 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
709 WARN_ON(1);
710 return;
711 }
712
713 table_length = table->length;
714
715 /* Skip RSDT/XSDT which should only be used for override */
716 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
717 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
718 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
719 goto next_table;
720 }
721 /*
722 * Mark the table to avoid being used in
723 * acpi_table_initrd_override(). Though this is not possible
724 * because override is disabled in acpi_install_table().
725 */
726 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
727 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
728 goto next_table;
729 }
730
731 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
732 table->signature, table->oem_id,
733 table->oem_table_id);
734 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
735 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
736next_table:
737 table_offset += table_length;
738 table_index++;
739 }
740}
741#else
742static acpi_status
743acpi_table_initrd_override(struct acpi_table_header *existing_table,
744 acpi_physical_address *address,
745 u32 *table_length)
746{
747 *table_length = 0;
748 *address = 0;
749 return AE_OK;
750}
751
752static void __init acpi_table_initrd_scan(void)
753{
754}
755#endif /* CONFIG_ACPI_TABLE_UPGRADE */
756
757acpi_status
758acpi_os_physical_table_override(struct acpi_table_header *existing_table,
759 acpi_physical_address *address,
760 u32 *table_length)
761{
762 return acpi_table_initrd_override(existing_table, address,
763 table_length);
764}
765
766#ifdef CONFIG_ACPI_CUSTOM_DSDT
767static void *amlcode __attribute__ ((weakref("AmlCode")));
768static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
769#endif
770
771acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
772 struct acpi_table_header **new_table)
773{
774 if (!existing_table || !new_table)
775 return AE_BAD_PARAMETER;
776
777 *new_table = NULL;
778
779#ifdef CONFIG_ACPI_CUSTOM_DSDT
780 if (!strncmp(existing_table->signature, "DSDT", 4)) {
781 *new_table = (struct acpi_table_header *)&amlcode;
782 if (!(*new_table))
783 *new_table = (struct acpi_table_header *)&dsdt_amlcode;
784 }
785#endif
786 if (*new_table != NULL)
787 acpi_table_taint(existing_table);
788 return AE_OK;
789}
790
791/*
792 * acpi_locate_initial_tables()
793 *
794 * find RSDP, find and checksum SDT/XSDT.
795 * checksum all tables, print SDT/XSDT
796 *
797 * result: sdt_entry[] is initialized
798 */
799
800int __init acpi_locate_initial_tables(void)
801{
802 acpi_status status;
803
804 if (acpi_verify_table_checksum) {
805 pr_info("Early table checksum verification enabled\n");
806 acpi_gbl_enable_table_validation = TRUE;
807 } else {
808 pr_info("Early table checksum verification disabled\n");
809 acpi_gbl_enable_table_validation = FALSE;
810 }
811
812 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
813 if (ACPI_FAILURE(status))
814 return -EINVAL;
815
816 return 0;
817}
818
819void __init acpi_reserve_initial_tables(void)
820{
821 int i;
822
823 for (i = 0; i < ACPI_MAX_TABLES; i++) {
824 struct acpi_table_desc *table_desc = &initial_tables[i];
825 u64 start = table_desc->address;
826 u64 size = table_desc->length;
827
828 if (!start || !size)
829 break;
830
831 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
832 table_desc->signature.ascii, start, start + size - 1);
833
834 memblock_reserve(start, size);
835 }
836}
837
838void __init acpi_table_init_complete(void)
839{
840 acpi_table_initrd_scan();
841 check_multiple_madt();
842}
843
844int __init acpi_table_init(void)
845{
846 int ret;
847
848 ret = acpi_locate_initial_tables();
849 if (ret)
850 return ret;
851
852 acpi_table_init_complete();
853
854 return 0;
855}
856
857static int __init acpi_parse_apic_instance(char *str)
858{
859 if (!str)
860 return -EINVAL;
861
862 if (kstrtoint(str, 0, &acpi_apic_instance))
863 return -EINVAL;
864
865 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
866
867 return 0;
868}
869early_param("acpi_apic_instance", acpi_parse_apic_instance);
870
871static int __init acpi_force_table_verification_setup(char *s)
872{
873 acpi_verify_table_checksum = true;
874
875 return 0;
876}
877early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
878
879static int __init acpi_force_32bit_fadt_addr(char *s)
880{
881 pr_info("Forcing 32 Bit FADT addresses\n");
882 acpi_gbl_use32_bit_fadt_addresses = TRUE;
883
884 return 0;
885}
886early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);