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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};
43
44struct acpi_subtable_entry {
45 union acpi_subtable_headers *hdr;
46 enum acpi_subtable_type type;
47};
48
49/*
50 * Disable table checksum verification for the early stage due to the size
51 * limitation of the current x86 early mapping implementation.
52 */
53static bool acpi_verify_table_checksum __initdata = false;
54
55void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
56{
57 if (!header)
58 return;
59
60 switch (header->type) {
61
62 case ACPI_MADT_TYPE_LOCAL_APIC:
63 {
64 struct acpi_madt_local_apic *p =
65 (struct acpi_madt_local_apic *)header;
66 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
67 p->processor_id, p->id,
68 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
69 }
70 break;
71
72 case ACPI_MADT_TYPE_LOCAL_X2APIC:
73 {
74 struct acpi_madt_local_x2apic *p =
75 (struct acpi_madt_local_x2apic *)header;
76 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
77 p->local_apic_id, p->uid,
78 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
79 }
80 break;
81
82 case ACPI_MADT_TYPE_IO_APIC:
83 {
84 struct acpi_madt_io_apic *p =
85 (struct acpi_madt_io_apic *)header;
86 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
87 p->id, p->address, p->global_irq_base);
88 }
89 break;
90
91 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
92 {
93 struct acpi_madt_interrupt_override *p =
94 (struct acpi_madt_interrupt_override *)header;
95 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
96 p->bus, p->source_irq, p->global_irq,
97 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
98 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
99 if (p->inti_flags &
100 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
101 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
102 p->inti_flags &
103 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
104 }
105 break;
106
107 case ACPI_MADT_TYPE_NMI_SOURCE:
108 {
109 struct acpi_madt_nmi_source *p =
110 (struct acpi_madt_nmi_source *)header;
111 pr_info("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 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
123 p->processor_id,
124 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
125 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
126 p->lint);
127 }
128 break;
129
130 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
131 {
132 u16 polarity, trigger;
133 struct acpi_madt_local_x2apic_nmi *p =
134 (struct acpi_madt_local_x2apic_nmi *)header;
135
136 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
137 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
138
139 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
140 p->uid,
141 mps_inti_flags_polarity[polarity],
142 mps_inti_flags_trigger[trigger],
143 p->lint);
144 }
145 break;
146
147 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
148 {
149 struct acpi_madt_local_apic_override *p =
150 (struct acpi_madt_local_apic_override *)header;
151 pr_info("LAPIC_ADDR_OVR (address[%p])\n",
152 (void *)(unsigned long)p->address);
153 }
154 break;
155
156 case ACPI_MADT_TYPE_IO_SAPIC:
157 {
158 struct acpi_madt_io_sapic *p =
159 (struct acpi_madt_io_sapic *)header;
160 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
161 p->id, (void *)(unsigned long)p->address,
162 p->global_irq_base);
163 }
164 break;
165
166 case ACPI_MADT_TYPE_LOCAL_SAPIC:
167 {
168 struct acpi_madt_local_sapic *p =
169 (struct acpi_madt_local_sapic *)header;
170 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
171 p->processor_id, p->id, p->eid,
172 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
173 }
174 break;
175
176 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
177 {
178 struct acpi_madt_interrupt_source *p =
179 (struct acpi_madt_interrupt_source *)header;
180 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",
181 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
182 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
183 p->type, p->id, p->eid, p->io_sapic_vector,
184 p->global_irq);
185 }
186 break;
187
188 case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
189 {
190 struct acpi_madt_generic_interrupt *p =
191 (struct acpi_madt_generic_interrupt *)header;
192 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
193 p->uid, p->base_address,
194 p->arm_mpidr,
195 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
196
197 }
198 break;
199
200 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
201 {
202 struct acpi_madt_generic_distributor *p =
203 (struct acpi_madt_generic_distributor *)header;
204 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
205 p->gic_id, p->base_address,
206 p->global_irq_base);
207 }
208 break;
209
210 default:
211 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
212 header->type);
213 break;
214 }
215}
216
217static unsigned long __init
218acpi_get_entry_type(struct acpi_subtable_entry *entry)
219{
220 switch (entry->type) {
221 case ACPI_SUBTABLE_COMMON:
222 return entry->hdr->common.type;
223 case ACPI_SUBTABLE_HMAT:
224 return entry->hdr->hmat.type;
225 }
226 return 0;
227}
228
229static unsigned long __init
230acpi_get_entry_length(struct acpi_subtable_entry *entry)
231{
232 switch (entry->type) {
233 case ACPI_SUBTABLE_COMMON:
234 return entry->hdr->common.length;
235 case ACPI_SUBTABLE_HMAT:
236 return entry->hdr->hmat.length;
237 }
238 return 0;
239}
240
241static unsigned long __init
242acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
243{
244 switch (entry->type) {
245 case ACPI_SUBTABLE_COMMON:
246 return sizeof(entry->hdr->common);
247 case ACPI_SUBTABLE_HMAT:
248 return sizeof(entry->hdr->hmat);
249 }
250 return 0;
251}
252
253static enum acpi_subtable_type __init
254acpi_get_subtable_type(char *id)
255{
256 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
257 return ACPI_SUBTABLE_HMAT;
258 return ACPI_SUBTABLE_COMMON;
259}
260
261/**
262 * acpi_parse_entries_array - for each proc_num find a suitable subtable
263 *
264 * @id: table id (for debugging purposes)
265 * @table_size: size of the root table
266 * @table_header: where does the table start?
267 * @proc: array of acpi_subtable_proc struct containing entry id
268 * and associated handler with it
269 * @proc_num: how big proc is?
270 * @max_entries: how many entries can we process?
271 *
272 * For each proc_num find a subtable with proc->id and run proc->handler
273 * on it. Assumption is that there's only single handler for particular
274 * entry id.
275 *
276 * The table_size is not the size of the complete ACPI table (the length
277 * field in the header struct), but only the size of the root table; i.e.,
278 * the offset from the very first byte of the complete ACPI table, to the
279 * first byte of the very first subtable.
280 *
281 * On success returns sum of all matching entries for all proc handlers.
282 * Otherwise, -ENODEV or -EINVAL is returned.
283 */
284static int __init acpi_parse_entries_array(char *id, unsigned long table_size,
285 struct acpi_table_header *table_header,
286 struct acpi_subtable_proc *proc, int proc_num,
287 unsigned int max_entries)
288{
289 struct acpi_subtable_entry entry;
290 unsigned long table_end, subtable_len, entry_len;
291 int count = 0;
292 int errs = 0;
293 int i;
294
295 if (acpi_disabled)
296 return -ENODEV;
297
298 if (!id)
299 return -EINVAL;
300
301 if (!table_size)
302 return -EINVAL;
303
304 if (!table_header) {
305 pr_warn("%4.4s not present\n", id);
306 return -ENODEV;
307 }
308
309 table_end = (unsigned long)table_header + table_header->length;
310
311 /* Parse all entries looking for a match. */
312
313 entry.type = acpi_get_subtable_type(id);
314 entry.hdr = (union acpi_subtable_headers *)
315 ((unsigned long)table_header + table_size);
316 subtable_len = acpi_get_subtable_header_length(&entry);
317
318 while (((unsigned long)entry.hdr) + subtable_len < table_end) {
319 if (max_entries && count >= max_entries)
320 break;
321
322 for (i = 0; i < proc_num; i++) {
323 if (acpi_get_entry_type(&entry) != proc[i].id)
324 continue;
325 if (!proc[i].handler ||
326 (!errs && proc[i].handler(entry.hdr, table_end))) {
327 errs++;
328 continue;
329 }
330
331 proc[i].count++;
332 break;
333 }
334 if (i != proc_num)
335 count++;
336
337 /*
338 * If entry->length is 0, break from this loop to avoid
339 * infinite loop.
340 */
341 entry_len = acpi_get_entry_length(&entry);
342 if (entry_len == 0) {
343 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
344 return -EINVAL;
345 }
346
347 entry.hdr = (union acpi_subtable_headers *)
348 ((unsigned long)entry.hdr + entry_len);
349 }
350
351 if (max_entries && count > max_entries) {
352 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
353 id, proc->id, count);
354 }
355
356 return errs ? -EINVAL : count;
357}
358
359int __init acpi_table_parse_entries_array(char *id,
360 unsigned long table_size,
361 struct acpi_subtable_proc *proc, int proc_num,
362 unsigned int max_entries)
363{
364 struct acpi_table_header *table_header = NULL;
365 int count;
366 u32 instance = 0;
367
368 if (acpi_disabled)
369 return -ENODEV;
370
371 if (!id)
372 return -EINVAL;
373
374 if (!strncmp(id, ACPI_SIG_MADT, 4))
375 instance = acpi_apic_instance;
376
377 acpi_get_table(id, instance, &table_header);
378 if (!table_header) {
379 pr_warn("%4.4s not present\n", id);
380 return -ENODEV;
381 }
382
383 count = acpi_parse_entries_array(id, table_size, table_header,
384 proc, proc_num, max_entries);
385
386 acpi_put_table(table_header);
387 return count;
388}
389
390int __init acpi_table_parse_entries(char *id,
391 unsigned long table_size,
392 int entry_id,
393 acpi_tbl_entry_handler handler,
394 unsigned int max_entries)
395{
396 struct acpi_subtable_proc proc = {
397 .id = entry_id,
398 .handler = handler,
399 };
400
401 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
402 max_entries);
403}
404
405int __init acpi_table_parse_madt(enum acpi_madt_type id,
406 acpi_tbl_entry_handler handler, unsigned int max_entries)
407{
408 return acpi_table_parse_entries(ACPI_SIG_MADT,
409 sizeof(struct acpi_table_madt), id,
410 handler, max_entries);
411}
412
413/**
414 * acpi_table_parse - find table with @id, run @handler on it
415 * @id: table id to find
416 * @handler: handler to run
417 *
418 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
419 * run @handler on it.
420 *
421 * Return 0 if table found, -errno if not.
422 */
423int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
424{
425 struct acpi_table_header *table = NULL;
426
427 if (acpi_disabled)
428 return -ENODEV;
429
430 if (!id || !handler)
431 return -EINVAL;
432
433 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
434 acpi_get_table(id, acpi_apic_instance, &table);
435 else
436 acpi_get_table(id, 0, &table);
437
438 if (table) {
439 handler(table);
440 acpi_put_table(table);
441 return 0;
442 } else
443 return -ENODEV;
444}
445
446/*
447 * The BIOS is supposed to supply a single APIC/MADT,
448 * but some report two. Provide a knob to use either.
449 * (don't you wish instance 0 and 1 were not the same?)
450 */
451static void __init check_multiple_madt(void)
452{
453 struct acpi_table_header *table = NULL;
454
455 acpi_get_table(ACPI_SIG_MADT, 2, &table);
456 if (table) {
457 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
458 acpi_apic_instance);
459 pr_warn("If \"acpi_apic_instance=%d\" works better, "
460 "notify linux-acpi@vger.kernel.org\n",
461 acpi_apic_instance ? 0 : 2);
462 acpi_put_table(table);
463
464 } else
465 acpi_apic_instance = 0;
466
467 return;
468}
469
470static void acpi_table_taint(struct acpi_table_header *table)
471{
472 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
473 table->signature, table->oem_table_id);
474 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
475}
476
477#ifdef CONFIG_ACPI_TABLE_UPGRADE
478static u64 acpi_tables_addr;
479static int all_tables_size;
480
481/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
482static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
483{
484 u8 sum = 0;
485 u8 *end = buffer + length;
486
487 while (buffer < end)
488 sum = (u8) (sum + *(buffer++));
489 return sum;
490}
491
492/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
493static const char * const table_sigs[] = {
494 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
495 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
496 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
497 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
498 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
499 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
500 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
501 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
502 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
503 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
504 NULL };
505
506#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
507
508#define NR_ACPI_INITRD_TABLES 64
509static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
510static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
511
512#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
513
514void __init acpi_table_upgrade(void)
515{
516 void *data;
517 size_t size;
518 int sig, no, table_nr = 0, total_offset = 0;
519 long offset = 0;
520 struct acpi_table_header *table;
521 char cpio_path[32] = "kernel/firmware/acpi/";
522 struct cpio_data file;
523
524 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
525 data = __initramfs_start;
526 size = __initramfs_size;
527 } else {
528 data = (void *)initrd_start;
529 size = initrd_end - initrd_start;
530 }
531
532 if (data == NULL || size == 0)
533 return;
534
535 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
536 file = find_cpio_data(cpio_path, data, size, &offset);
537 if (!file.data)
538 break;
539
540 data += offset;
541 size -= offset;
542
543 if (file.size < sizeof(struct acpi_table_header)) {
544 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
545 cpio_path, file.name);
546 continue;
547 }
548
549 table = file.data;
550
551 for (sig = 0; table_sigs[sig]; sig++)
552 if (!memcmp(table->signature, table_sigs[sig], 4))
553 break;
554
555 if (!table_sigs[sig]) {
556 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
557 cpio_path, file.name);
558 continue;
559 }
560 if (file.size != table->length) {
561 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
562 cpio_path, file.name);
563 continue;
564 }
565 if (acpi_table_checksum(file.data, table->length)) {
566 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
567 cpio_path, file.name);
568 continue;
569 }
570
571 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
572 table->signature, cpio_path, file.name, table->length);
573
574 all_tables_size += table->length;
575 acpi_initrd_files[table_nr].data = file.data;
576 acpi_initrd_files[table_nr].size = file.size;
577 table_nr++;
578 }
579 if (table_nr == 0)
580 return;
581
582 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
583 pr_notice("kernel is locked down, ignoring table override\n");
584 return;
585 }
586
587 acpi_tables_addr =
588 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS,
589 all_tables_size, PAGE_SIZE);
590 if (!acpi_tables_addr) {
591 WARN_ON(1);
592 return;
593 }
594 /*
595 * Only calling e820_add_reserve does not work and the
596 * tables are invalid (memory got used) later.
597 * memblock_reserve works as expected and the tables won't get modified.
598 * But it's not enough on X86 because ioremap will
599 * complain later (used by acpi_os_map_memory) that the pages
600 * that should get mapped are not marked "reserved".
601 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
602 * works fine.
603 */
604 memblock_reserve(acpi_tables_addr, all_tables_size);
605 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
606
607 /*
608 * early_ioremap only can remap 256k one time. If we map all
609 * tables one time, we will hit the limit. Need to map chunks
610 * one by one during copying the same as that in relocate_initrd().
611 */
612 for (no = 0; no < table_nr; no++) {
613 unsigned char *src_p = acpi_initrd_files[no].data;
614 phys_addr_t size = acpi_initrd_files[no].size;
615 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
616 phys_addr_t slop, clen;
617 char *dest_p;
618
619 total_offset += size;
620
621 while (size) {
622 slop = dest_addr & ~PAGE_MASK;
623 clen = size;
624 if (clen > MAP_CHUNK_SIZE - slop)
625 clen = MAP_CHUNK_SIZE - slop;
626 dest_p = early_memremap(dest_addr & PAGE_MASK,
627 clen + slop);
628 memcpy(dest_p + slop, src_p, clen);
629 early_memunmap(dest_p, clen + slop);
630 src_p += clen;
631 dest_addr += clen;
632 size -= clen;
633 }
634 }
635}
636
637static acpi_status
638acpi_table_initrd_override(struct acpi_table_header *existing_table,
639 acpi_physical_address *address, u32 *length)
640{
641 int table_offset = 0;
642 int table_index = 0;
643 struct acpi_table_header *table;
644 u32 table_length;
645
646 *length = 0;
647 *address = 0;
648 if (!acpi_tables_addr)
649 return AE_OK;
650
651 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
652 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
653 ACPI_HEADER_SIZE);
654 if (table_offset + table->length > all_tables_size) {
655 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
656 WARN_ON(1);
657 return AE_OK;
658 }
659
660 table_length = table->length;
661
662 /* Only override tables matched */
663 if (memcmp(existing_table->signature, table->signature, 4) ||
664 memcmp(table->oem_id, existing_table->oem_id,
665 ACPI_OEM_ID_SIZE) ||
666 memcmp(table->oem_table_id, existing_table->oem_table_id,
667 ACPI_OEM_TABLE_ID_SIZE)) {
668 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
669 goto next_table;
670 }
671 /*
672 * Mark the table to avoid being used in
673 * acpi_table_initrd_scan() and check the revision.
674 */
675 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
676 existing_table->oem_revision >= table->oem_revision) {
677 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
678 goto next_table;
679 }
680
681 *length = table_length;
682 *address = acpi_tables_addr + table_offset;
683 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
684 table->signature, table->oem_id,
685 table->oem_table_id);
686 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
687 break;
688
689next_table:
690 table_offset += table_length;
691 table_index++;
692 }
693 return AE_OK;
694}
695
696static void __init acpi_table_initrd_scan(void)
697{
698 int table_offset = 0;
699 int table_index = 0;
700 u32 table_length;
701 struct acpi_table_header *table;
702
703 if (!acpi_tables_addr)
704 return;
705
706 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
707 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
708 ACPI_HEADER_SIZE);
709 if (table_offset + table->length > all_tables_size) {
710 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
711 WARN_ON(1);
712 return;
713 }
714
715 table_length = table->length;
716
717 /* Skip RSDT/XSDT which should only be used for override */
718 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
719 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
720 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
721 goto next_table;
722 }
723 /*
724 * Mark the table to avoid being used in
725 * acpi_table_initrd_override(). Though this is not possible
726 * because override is disabled in acpi_install_table().
727 */
728 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
729 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
730 goto next_table;
731 }
732
733 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
734 table->signature, table->oem_id,
735 table->oem_table_id);
736 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
737 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
738next_table:
739 table_offset += table_length;
740 table_index++;
741 }
742}
743#else
744static acpi_status
745acpi_table_initrd_override(struct acpi_table_header *existing_table,
746 acpi_physical_address *address,
747 u32 *table_length)
748{
749 *table_length = 0;
750 *address = 0;
751 return AE_OK;
752}
753
754static void __init acpi_table_initrd_scan(void)
755{
756}
757#endif /* CONFIG_ACPI_TABLE_UPGRADE */
758
759acpi_status
760acpi_os_physical_table_override(struct acpi_table_header *existing_table,
761 acpi_physical_address *address,
762 u32 *table_length)
763{
764 return acpi_table_initrd_override(existing_table, address,
765 table_length);
766}
767
768#ifdef CONFIG_ACPI_CUSTOM_DSDT
769static void *amlcode __attribute__ ((weakref("AmlCode")));
770static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
771#endif
772
773acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
774 struct acpi_table_header **new_table)
775{
776 if (!existing_table || !new_table)
777 return AE_BAD_PARAMETER;
778
779 *new_table = NULL;
780
781#ifdef CONFIG_ACPI_CUSTOM_DSDT
782 if (!strncmp(existing_table->signature, "DSDT", 4)) {
783 *new_table = (struct acpi_table_header *)&amlcode;
784 if (!(*new_table))
785 *new_table = (struct acpi_table_header *)&dsdt_amlcode;
786 }
787#endif
788 if (*new_table != NULL)
789 acpi_table_taint(existing_table);
790 return AE_OK;
791}
792
793/*
794 * acpi_table_init()
795 *
796 * find RSDP, find and checksum SDT/XSDT.
797 * checksum all tables, print SDT/XSDT
798 *
799 * result: sdt_entry[] is initialized
800 */
801
802int __init acpi_table_init(void)
803{
804 acpi_status status;
805
806 if (acpi_verify_table_checksum) {
807 pr_info("Early table checksum verification enabled\n");
808 acpi_gbl_enable_table_validation = TRUE;
809 } else {
810 pr_info("Early table checksum verification disabled\n");
811 acpi_gbl_enable_table_validation = FALSE;
812 }
813
814 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
815 if (ACPI_FAILURE(status))
816 return -EINVAL;
817 acpi_table_initrd_scan();
818
819 check_multiple_madt();
820 return 0;
821}
822
823static int __init acpi_parse_apic_instance(char *str)
824{
825 if (!str)
826 return -EINVAL;
827
828 if (kstrtoint(str, 0, &acpi_apic_instance))
829 return -EINVAL;
830
831 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
832
833 return 0;
834}
835early_param("acpi_apic_instance", acpi_parse_apic_instance);
836
837static int __init acpi_force_table_verification_setup(char *s)
838{
839 acpi_verify_table_checksum = true;
840
841 return 0;
842}
843early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
844
845static int __init acpi_force_32bit_fadt_addr(char *s)
846{
847 pr_info("Forcing 32 Bit FADT addresses\n");
848 acpi_gbl_use32_bit_fadt_addresses = TRUE;
849
850 return 0;
851}
852early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);