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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 <linux/kmemleak.h>
25#include "internal.h"
26
27#ifdef CONFIG_ACPI_CUSTOM_DSDT
28#include CONFIG_ACPI_CUSTOM_DSDT_FILE
29#endif
30
31#define ACPI_MAX_TABLES 128
32
33static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
34static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
35
36static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
37
38static int acpi_apic_instance __initdata_or_acpilib;
39
40/*
41 * Disable table checksum verification for the early stage due to the size
42 * limitation of the current x86 early mapping implementation.
43 */
44static bool acpi_verify_table_checksum __initdata_or_acpilib = false;
45
46void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
47{
48 if (!header)
49 return;
50
51 switch (header->type) {
52
53 case ACPI_MADT_TYPE_LOCAL_APIC:
54 {
55 struct acpi_madt_local_apic *p =
56 (struct acpi_madt_local_apic *)header;
57 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
58 p->processor_id, p->id,
59 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
60 }
61 break;
62
63 case ACPI_MADT_TYPE_LOCAL_X2APIC:
64 {
65 struct acpi_madt_local_x2apic *p =
66 (struct acpi_madt_local_x2apic *)header;
67 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
68 p->local_apic_id, p->uid,
69 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
70 }
71 break;
72
73 case ACPI_MADT_TYPE_IO_APIC:
74 {
75 struct acpi_madt_io_apic *p =
76 (struct acpi_madt_io_apic *)header;
77 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
78 p->id, p->address, p->global_irq_base);
79 }
80 break;
81
82 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
83 {
84 struct acpi_madt_interrupt_override *p =
85 (struct acpi_madt_interrupt_override *)header;
86 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
87 p->bus, p->source_irq, p->global_irq,
88 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
89 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
90 if (p->inti_flags &
91 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
92 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
93 p->inti_flags &
94 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
95 }
96 break;
97
98 case ACPI_MADT_TYPE_NMI_SOURCE:
99 {
100 struct acpi_madt_nmi_source *p =
101 (struct acpi_madt_nmi_source *)header;
102 pr_info("NMI_SRC (%s %s global_irq %d)\n",
103 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
104 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
105 p->global_irq);
106 }
107 break;
108
109 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
110 {
111 struct acpi_madt_local_apic_nmi *p =
112 (struct acpi_madt_local_apic_nmi *)header;
113 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
114 p->processor_id,
115 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
116 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
117 p->lint);
118 }
119 break;
120
121 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
122 {
123 u16 polarity, trigger;
124 struct acpi_madt_local_x2apic_nmi *p =
125 (struct acpi_madt_local_x2apic_nmi *)header;
126
127 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
128 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
129
130 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
131 p->uid,
132 mps_inti_flags_polarity[polarity],
133 mps_inti_flags_trigger[trigger],
134 p->lint);
135 }
136 break;
137
138 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
139 {
140 struct acpi_madt_local_apic_override *p =
141 (struct acpi_madt_local_apic_override *)header;
142 pr_info("LAPIC_ADDR_OVR (address[0x%llx])\n",
143 p->address);
144 }
145 break;
146
147 case ACPI_MADT_TYPE_IO_SAPIC:
148 {
149 struct acpi_madt_io_sapic *p =
150 (struct acpi_madt_io_sapic *)header;
151 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
152 p->id, (void *)(unsigned long)p->address,
153 p->global_irq_base);
154 }
155 break;
156
157 case ACPI_MADT_TYPE_LOCAL_SAPIC:
158 {
159 struct acpi_madt_local_sapic *p =
160 (struct acpi_madt_local_sapic *)header;
161 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
162 p->processor_id, p->id, p->eid,
163 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
164 }
165 break;
166
167 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
168 {
169 struct acpi_madt_interrupt_source *p =
170 (struct acpi_madt_interrupt_source *)header;
171 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",
172 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
173 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
174 p->type, p->id, p->eid, p->io_sapic_vector,
175 p->global_irq);
176 }
177 break;
178
179 case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
180 {
181 struct acpi_madt_generic_interrupt *p =
182 (struct acpi_madt_generic_interrupt *)header;
183 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
184 p->uid, p->base_address,
185 p->arm_mpidr,
186 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
187
188 }
189 break;
190
191 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
192 {
193 struct acpi_madt_generic_distributor *p =
194 (struct acpi_madt_generic_distributor *)header;
195 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
196 p->gic_id, p->base_address,
197 p->global_irq_base);
198 }
199 break;
200
201 case ACPI_MADT_TYPE_CORE_PIC:
202 {
203 struct acpi_madt_core_pic *p = (struct acpi_madt_core_pic *)header;
204
205 pr_debug("CORE PIC (processor_id[0x%02x] core_id[0x%02x] %s)\n",
206 p->processor_id, p->core_id,
207 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
208 }
209 break;
210
211 case ACPI_MADT_TYPE_RINTC:
212 {
213 struct acpi_madt_rintc *p = (struct acpi_madt_rintc *)header;
214
215 pr_debug("RISC-V INTC (acpi_uid[0x%04x] hart_id[0x%llx] %s)\n",
216 p->uid, p->hart_id,
217 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
218 }
219 break;
220
221 default:
222 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
223 header->type);
224 break;
225 }
226}
227
228int __init_or_acpilib acpi_table_parse_entries_array(
229 char *id, unsigned long table_size, struct acpi_subtable_proc *proc,
230 int proc_num, unsigned int max_entries)
231{
232 struct acpi_table_header *table_header = NULL;
233 int count;
234 u32 instance = 0;
235
236 if (acpi_disabled)
237 return -ENODEV;
238
239 if (!id)
240 return -EINVAL;
241
242 if (!table_size)
243 return -EINVAL;
244
245 if (!strncmp(id, ACPI_SIG_MADT, 4))
246 instance = acpi_apic_instance;
247
248 acpi_get_table(id, instance, &table_header);
249 if (!table_header) {
250 pr_debug("%4.4s not present\n", id);
251 return -ENODEV;
252 }
253
254 count = acpi_parse_entries_array(id, table_size,
255 (union fw_table_header *)table_header,
256 proc, proc_num, max_entries);
257
258 acpi_put_table(table_header);
259 return count;
260}
261
262static int __init_or_acpilib __acpi_table_parse_entries(
263 char *id, unsigned long table_size, int entry_id,
264 acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg,
265 void *arg, unsigned int max_entries)
266{
267 struct acpi_subtable_proc proc = {
268 .id = entry_id,
269 .handler = handler,
270 .handler_arg = handler_arg,
271 .arg = arg,
272 };
273
274 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
275 max_entries);
276}
277
278int __init_or_acpilib
279acpi_table_parse_cedt(enum acpi_cedt_type id,
280 acpi_tbl_entry_handler_arg handler_arg, void *arg)
281{
282 return __acpi_table_parse_entries(ACPI_SIG_CEDT,
283 sizeof(struct acpi_table_cedt), id,
284 NULL, handler_arg, arg, 0);
285}
286EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt);
287
288int __init acpi_table_parse_entries(char *id, unsigned long table_size,
289 int entry_id,
290 acpi_tbl_entry_handler handler,
291 unsigned int max_entries)
292{
293 return __acpi_table_parse_entries(id, table_size, entry_id, handler,
294 NULL, NULL, max_entries);
295}
296
297int __init acpi_table_parse_madt(enum acpi_madt_type id,
298 acpi_tbl_entry_handler handler, unsigned int max_entries)
299{
300 return acpi_table_parse_entries(ACPI_SIG_MADT,
301 sizeof(struct acpi_table_madt), id,
302 handler, max_entries);
303}
304
305/**
306 * acpi_table_parse - find table with @id, run @handler on it
307 * @id: table id to find
308 * @handler: handler to run
309 *
310 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
311 * run @handler on it.
312 *
313 * Return 0 if table found, -errno if not.
314 */
315int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
316{
317 struct acpi_table_header *table = NULL;
318
319 if (acpi_disabled)
320 return -ENODEV;
321
322 if (!id || !handler)
323 return -EINVAL;
324
325 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
326 acpi_get_table(id, acpi_apic_instance, &table);
327 else
328 acpi_get_table(id, 0, &table);
329
330 if (table) {
331 handler(table);
332 acpi_put_table(table);
333 return 0;
334 } else
335 return -ENODEV;
336}
337
338/*
339 * The BIOS is supposed to supply a single APIC/MADT,
340 * but some report two. Provide a knob to use either.
341 * (don't you wish instance 0 and 1 were not the same?)
342 */
343static void __init check_multiple_madt(void)
344{
345 struct acpi_table_header *table = NULL;
346
347 acpi_get_table(ACPI_SIG_MADT, 2, &table);
348 if (table) {
349 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
350 acpi_apic_instance);
351 pr_warn("If \"acpi_apic_instance=%d\" works better, "
352 "notify linux-acpi@vger.kernel.org\n",
353 acpi_apic_instance ? 0 : 2);
354 acpi_put_table(table);
355
356 } else
357 acpi_apic_instance = 0;
358
359 return;
360}
361
362static void acpi_table_taint(struct acpi_table_header *table)
363{
364 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
365 table->signature, table->oem_table_id);
366 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
367}
368
369#ifdef CONFIG_ACPI_TABLE_UPGRADE
370static u64 acpi_tables_addr;
371static int all_tables_size;
372
373/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
374static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
375{
376 u8 sum = 0;
377 u8 *end = buffer + length;
378
379 while (buffer < end)
380 sum = (u8) (sum + *(buffer++));
381 return sum;
382}
383
384/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
385static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
386 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
387 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
388 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
389 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
390 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
391 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
392 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
393 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
394 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
395 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
396 ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI,
397 ACPI_SIG_NBFT };
398
399#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
400
401#define NR_ACPI_INITRD_TABLES 64
402static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
403static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
404
405#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
406
407void __init acpi_table_upgrade(void)
408{
409 void *data;
410 size_t size;
411 int sig, no, table_nr = 0, total_offset = 0;
412 long offset = 0;
413 struct acpi_table_header *table;
414 char cpio_path[32] = "kernel/firmware/acpi/";
415 struct cpio_data file;
416
417 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
418 data = __initramfs_start;
419 size = __initramfs_size;
420 } else {
421 data = (void *)initrd_start;
422 size = initrd_end - initrd_start;
423 }
424
425 if (data == NULL || size == 0)
426 return;
427
428 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
429 file = find_cpio_data(cpio_path, data, size, &offset);
430 if (!file.data)
431 break;
432
433 data += offset;
434 size -= offset;
435
436 if (file.size < sizeof(struct acpi_table_header)) {
437 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
438 cpio_path, file.name);
439 continue;
440 }
441
442 table = file.data;
443
444 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
445 if (!memcmp(table->signature, table_sigs[sig], 4))
446 break;
447
448 if (sig >= ARRAY_SIZE(table_sigs)) {
449 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
450 cpio_path, file.name);
451 continue;
452 }
453 if (file.size != table->length) {
454 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
455 cpio_path, file.name);
456 continue;
457 }
458 if (acpi_table_checksum(file.data, table->length)) {
459 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
460 cpio_path, file.name);
461 continue;
462 }
463
464 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
465 table->signature, cpio_path, file.name, table->length);
466
467 all_tables_size += table->length;
468 acpi_initrd_files[table_nr].data = file.data;
469 acpi_initrd_files[table_nr].size = file.size;
470 table_nr++;
471 }
472 if (table_nr == 0)
473 return;
474
475 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
476 pr_notice("kernel is locked down, ignoring table override\n");
477 return;
478 }
479
480 acpi_tables_addr =
481 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE,
482 0, ACPI_TABLE_UPGRADE_MAX_PHYS);
483 if (!acpi_tables_addr) {
484 WARN_ON(1);
485 return;
486 }
487 /*
488 * Only calling e820_add_reserve does not work and the
489 * tables are invalid (memory got used) later.
490 * memblock_reserve works as expected and the tables won't get modified.
491 * But it's not enough on X86 because ioremap will
492 * complain later (used by acpi_os_map_memory) that the pages
493 * that should get mapped are not marked "reserved".
494 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
495 * works fine.
496 */
497 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
498
499 kmemleak_ignore_phys(acpi_tables_addr);
500
501 /*
502 * early_ioremap only can remap 256k one time. If we map all
503 * tables one time, we will hit the limit. Need to map chunks
504 * one by one during copying the same as that in relocate_initrd().
505 */
506 for (no = 0; no < table_nr; no++) {
507 unsigned char *src_p = acpi_initrd_files[no].data;
508 phys_addr_t size = acpi_initrd_files[no].size;
509 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
510 phys_addr_t slop, clen;
511 char *dest_p;
512
513 total_offset += size;
514
515 while (size) {
516 slop = dest_addr & ~PAGE_MASK;
517 clen = size;
518 if (clen > MAP_CHUNK_SIZE - slop)
519 clen = MAP_CHUNK_SIZE - slop;
520 dest_p = early_memremap(dest_addr & PAGE_MASK,
521 clen + slop);
522 memcpy(dest_p + slop, src_p, clen);
523 early_memunmap(dest_p, clen + slop);
524 src_p += clen;
525 dest_addr += clen;
526 size -= clen;
527 }
528 }
529}
530
531static acpi_status
532acpi_table_initrd_override(struct acpi_table_header *existing_table,
533 acpi_physical_address *address, u32 *length)
534{
535 int table_offset = 0;
536 int table_index = 0;
537 struct acpi_table_header *table;
538 u32 table_length;
539
540 *length = 0;
541 *address = 0;
542 if (!acpi_tables_addr)
543 return AE_OK;
544
545 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
546 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
547 ACPI_HEADER_SIZE);
548 if (table_offset + table->length > all_tables_size) {
549 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
550 WARN_ON(1);
551 return AE_OK;
552 }
553
554 table_length = table->length;
555
556 /* Only override tables matched */
557 if (memcmp(existing_table->signature, table->signature, 4) ||
558 memcmp(table->oem_id, existing_table->oem_id,
559 ACPI_OEM_ID_SIZE) ||
560 memcmp(table->oem_table_id, existing_table->oem_table_id,
561 ACPI_OEM_TABLE_ID_SIZE)) {
562 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
563 goto next_table;
564 }
565 /*
566 * Mark the table to avoid being used in
567 * acpi_table_initrd_scan() and check the revision.
568 */
569 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
570 existing_table->oem_revision >= table->oem_revision) {
571 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
572 goto next_table;
573 }
574
575 *length = table_length;
576 *address = acpi_tables_addr + table_offset;
577 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
578 table->signature, table->oem_id,
579 table->oem_table_id);
580 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
581 break;
582
583next_table:
584 table_offset += table_length;
585 table_index++;
586 }
587 return AE_OK;
588}
589
590static void __init acpi_table_initrd_scan(void)
591{
592 int table_offset = 0;
593 int table_index = 0;
594 u32 table_length;
595 struct acpi_table_header *table;
596
597 if (!acpi_tables_addr)
598 return;
599
600 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
601 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
602 ACPI_HEADER_SIZE);
603 if (table_offset + table->length > all_tables_size) {
604 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
605 WARN_ON(1);
606 return;
607 }
608
609 table_length = table->length;
610
611 /* Skip RSDT/XSDT which should only be used for override */
612 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
613 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
614 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
615 goto next_table;
616 }
617 /*
618 * Mark the table to avoid being used in
619 * acpi_table_initrd_override(). Though this is not possible
620 * because override is disabled in acpi_install_physical_table().
621 */
622 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
623 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
624 goto next_table;
625 }
626
627 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
628 table->signature, table->oem_id,
629 table->oem_table_id);
630 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
631 acpi_install_physical_table(acpi_tables_addr + table_offset);
632next_table:
633 table_offset += table_length;
634 table_index++;
635 }
636}
637#else
638static acpi_status
639acpi_table_initrd_override(struct acpi_table_header *existing_table,
640 acpi_physical_address *address,
641 u32 *table_length)
642{
643 *table_length = 0;
644 *address = 0;
645 return AE_OK;
646}
647
648static void __init acpi_table_initrd_scan(void)
649{
650}
651#endif /* CONFIG_ACPI_TABLE_UPGRADE */
652
653acpi_status
654acpi_os_physical_table_override(struct acpi_table_header *existing_table,
655 acpi_physical_address *address,
656 u32 *table_length)
657{
658 return acpi_table_initrd_override(existing_table, address,
659 table_length);
660}
661
662#ifdef CONFIG_ACPI_CUSTOM_DSDT
663static void *amlcode __attribute__ ((weakref("AmlCode")));
664static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
665#endif
666
667acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
668 struct acpi_table_header **new_table)
669{
670 if (!existing_table || !new_table)
671 return AE_BAD_PARAMETER;
672
673 *new_table = NULL;
674
675#ifdef CONFIG_ACPI_CUSTOM_DSDT
676 if (!strncmp(existing_table->signature, "DSDT", 4)) {
677 *new_table = (struct acpi_table_header *)&amlcode;
678 if (!(*new_table))
679 *new_table = (struct acpi_table_header *)&dsdt_amlcode;
680 }
681#endif
682 if (*new_table != NULL)
683 acpi_table_taint(existing_table);
684 return AE_OK;
685}
686
687/*
688 * acpi_locate_initial_tables()
689 *
690 * Get the RSDP, then find and checksum all the ACPI tables.
691 *
692 * result: initial_tables[] is initialized, and points to
693 * a list of ACPI tables.
694 */
695int __init acpi_locate_initial_tables(void)
696{
697 acpi_status status;
698
699 if (acpi_verify_table_checksum) {
700 pr_info("Early table checksum verification enabled\n");
701 acpi_gbl_enable_table_validation = TRUE;
702 } else {
703 pr_info("Early table checksum verification disabled\n");
704 acpi_gbl_enable_table_validation = FALSE;
705 }
706
707 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
708 if (ACPI_FAILURE(status))
709 return -EINVAL;
710
711 return 0;
712}
713
714void __init acpi_reserve_initial_tables(void)
715{
716 int i;
717
718 for (i = 0; i < ACPI_MAX_TABLES; i++) {
719 struct acpi_table_desc *table_desc = &initial_tables[i];
720 u64 start = table_desc->address;
721 u64 size = table_desc->length;
722
723 if (!start || !size)
724 break;
725
726 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
727 table_desc->signature.ascii, start, start + size - 1);
728
729 memblock_reserve(start, size);
730 }
731}
732
733void __init acpi_table_init_complete(void)
734{
735 acpi_table_initrd_scan();
736 check_multiple_madt();
737}
738
739int __init acpi_table_init(void)
740{
741 int ret;
742
743 ret = acpi_locate_initial_tables();
744 if (ret)
745 return ret;
746
747 acpi_table_init_complete();
748
749 return 0;
750}
751
752static int __init acpi_parse_apic_instance(char *str)
753{
754 if (!str)
755 return -EINVAL;
756
757 if (kstrtoint(str, 0, &acpi_apic_instance))
758 return -EINVAL;
759
760 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
761
762 return 0;
763}
764early_param("acpi_apic_instance", acpi_parse_apic_instance);
765
766static int __init acpi_force_table_verification_setup(char *s)
767{
768 acpi_verify_table_checksum = true;
769
770 return 0;
771}
772early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
773
774static int __init acpi_force_32bit_fadt_addr(char *s)
775{
776 pr_info("Forcing 32 Bit FADT addresses\n");
777 acpi_gbl_use32_bit_fadt_addresses = TRUE;
778
779 return 0;
780}
781early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);
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 <linux/kmemleak.h>
25#include "internal.h"
26
27#ifdef CONFIG_ACPI_CUSTOM_DSDT
28#include CONFIG_ACPI_CUSTOM_DSDT_FILE
29#endif
30
31#define ACPI_MAX_TABLES 128
32
33static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
34static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
35
36static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
37
38static int acpi_apic_instance __initdata_or_acpilib;
39
40enum acpi_subtable_type {
41 ACPI_SUBTABLE_COMMON,
42 ACPI_SUBTABLE_HMAT,
43 ACPI_SUBTABLE_PRMT,
44 ACPI_SUBTABLE_CEDT,
45};
46
47struct acpi_subtable_entry {
48 union acpi_subtable_headers *hdr;
49 enum acpi_subtable_type type;
50};
51
52/*
53 * Disable table checksum verification for the early stage due to the size
54 * limitation of the current x86 early mapping implementation.
55 */
56static bool acpi_verify_table_checksum __initdata_or_acpilib = false;
57
58void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
59{
60 if (!header)
61 return;
62
63 switch (header->type) {
64
65 case ACPI_MADT_TYPE_LOCAL_APIC:
66 {
67 struct acpi_madt_local_apic *p =
68 (struct acpi_madt_local_apic *)header;
69 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
70 p->processor_id, p->id,
71 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
72 }
73 break;
74
75 case ACPI_MADT_TYPE_LOCAL_X2APIC:
76 {
77 struct acpi_madt_local_x2apic *p =
78 (struct acpi_madt_local_x2apic *)header;
79 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
80 p->local_apic_id, p->uid,
81 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
82 }
83 break;
84
85 case ACPI_MADT_TYPE_IO_APIC:
86 {
87 struct acpi_madt_io_apic *p =
88 (struct acpi_madt_io_apic *)header;
89 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
90 p->id, p->address, p->global_irq_base);
91 }
92 break;
93
94 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
95 {
96 struct acpi_madt_interrupt_override *p =
97 (struct acpi_madt_interrupt_override *)header;
98 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
99 p->bus, p->source_irq, p->global_irq,
100 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
101 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
102 if (p->inti_flags &
103 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
104 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
105 p->inti_flags &
106 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
107 }
108 break;
109
110 case ACPI_MADT_TYPE_NMI_SOURCE:
111 {
112 struct acpi_madt_nmi_source *p =
113 (struct acpi_madt_nmi_source *)header;
114 pr_info("NMI_SRC (%s %s global_irq %d)\n",
115 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
116 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
117 p->global_irq);
118 }
119 break;
120
121 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
122 {
123 struct acpi_madt_local_apic_nmi *p =
124 (struct acpi_madt_local_apic_nmi *)header;
125 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
126 p->processor_id,
127 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
128 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
129 p->lint);
130 }
131 break;
132
133 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
134 {
135 u16 polarity, trigger;
136 struct acpi_madt_local_x2apic_nmi *p =
137 (struct acpi_madt_local_x2apic_nmi *)header;
138
139 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
140 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
141
142 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
143 p->uid,
144 mps_inti_flags_polarity[polarity],
145 mps_inti_flags_trigger[trigger],
146 p->lint);
147 }
148 break;
149
150 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
151 {
152 struct acpi_madt_local_apic_override *p =
153 (struct acpi_madt_local_apic_override *)header;
154 pr_info("LAPIC_ADDR_OVR (address[0x%llx])\n",
155 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 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
164 p->id, (void *)(unsigned long)p->address,
165 p->global_irq_base);
166 }
167 break;
168
169 case ACPI_MADT_TYPE_LOCAL_SAPIC:
170 {
171 struct acpi_madt_local_sapic *p =
172 (struct acpi_madt_local_sapic *)header;
173 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
174 p->processor_id, p->id, p->eid,
175 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
176 }
177 break;
178
179 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
180 {
181 struct acpi_madt_interrupt_source *p =
182 (struct acpi_madt_interrupt_source *)header;
183 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",
184 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
185 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
186 p->type, p->id, p->eid, p->io_sapic_vector,
187 p->global_irq);
188 }
189 break;
190
191 case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
192 {
193 struct acpi_madt_generic_interrupt *p =
194 (struct acpi_madt_generic_interrupt *)header;
195 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
196 p->uid, p->base_address,
197 p->arm_mpidr,
198 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
199
200 }
201 break;
202
203 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
204 {
205 struct acpi_madt_generic_distributor *p =
206 (struct acpi_madt_generic_distributor *)header;
207 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
208 p->gic_id, p->base_address,
209 p->global_irq_base);
210 }
211 break;
212
213 case ACPI_MADT_TYPE_CORE_PIC:
214 {
215 struct acpi_madt_core_pic *p = (struct acpi_madt_core_pic *)header;
216
217 pr_debug("CORE PIC (processor_id[0x%02x] core_id[0x%02x] %s)\n",
218 p->processor_id, p->core_id,
219 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
220 }
221 break;
222
223 default:
224 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
225 header->type);
226 break;
227 }
228}
229
230static unsigned long __init_or_acpilib
231acpi_get_entry_type(struct acpi_subtable_entry *entry)
232{
233 switch (entry->type) {
234 case ACPI_SUBTABLE_COMMON:
235 return entry->hdr->common.type;
236 case ACPI_SUBTABLE_HMAT:
237 return entry->hdr->hmat.type;
238 case ACPI_SUBTABLE_PRMT:
239 return 0;
240 case ACPI_SUBTABLE_CEDT:
241 return entry->hdr->cedt.type;
242 }
243 return 0;
244}
245
246static unsigned long __init_or_acpilib
247acpi_get_entry_length(struct acpi_subtable_entry *entry)
248{
249 switch (entry->type) {
250 case ACPI_SUBTABLE_COMMON:
251 return entry->hdr->common.length;
252 case ACPI_SUBTABLE_HMAT:
253 return entry->hdr->hmat.length;
254 case ACPI_SUBTABLE_PRMT:
255 return entry->hdr->prmt.length;
256 case ACPI_SUBTABLE_CEDT:
257 return entry->hdr->cedt.length;
258 }
259 return 0;
260}
261
262static unsigned long __init_or_acpilib
263acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
264{
265 switch (entry->type) {
266 case ACPI_SUBTABLE_COMMON:
267 return sizeof(entry->hdr->common);
268 case ACPI_SUBTABLE_HMAT:
269 return sizeof(entry->hdr->hmat);
270 case ACPI_SUBTABLE_PRMT:
271 return sizeof(entry->hdr->prmt);
272 case ACPI_SUBTABLE_CEDT:
273 return sizeof(entry->hdr->cedt);
274 }
275 return 0;
276}
277
278static enum acpi_subtable_type __init_or_acpilib
279acpi_get_subtable_type(char *id)
280{
281 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
282 return ACPI_SUBTABLE_HMAT;
283 if (strncmp(id, ACPI_SIG_PRMT, 4) == 0)
284 return ACPI_SUBTABLE_PRMT;
285 if (strncmp(id, ACPI_SIG_CEDT, 4) == 0)
286 return ACPI_SUBTABLE_CEDT;
287 return ACPI_SUBTABLE_COMMON;
288}
289
290static __init_or_acpilib bool has_handler(struct acpi_subtable_proc *proc)
291{
292 return proc->handler || proc->handler_arg;
293}
294
295static __init_or_acpilib int call_handler(struct acpi_subtable_proc *proc,
296 union acpi_subtable_headers *hdr,
297 unsigned long end)
298{
299 if (proc->handler)
300 return proc->handler(hdr, end);
301 if (proc->handler_arg)
302 return proc->handler_arg(hdr, proc->arg, end);
303 return -EINVAL;
304}
305
306/**
307 * acpi_parse_entries_array - for each proc_num find a suitable subtable
308 *
309 * @id: table id (for debugging purposes)
310 * @table_size: size of the root table
311 * @table_header: where does the table start?
312 * @proc: array of acpi_subtable_proc struct containing entry id
313 * and associated handler with it
314 * @proc_num: how big proc is?
315 * @max_entries: how many entries can we process?
316 *
317 * For each proc_num find a subtable with proc->id and run proc->handler
318 * on it. Assumption is that there's only single handler for particular
319 * entry id.
320 *
321 * The table_size is not the size of the complete ACPI table (the length
322 * field in the header struct), but only the size of the root table; i.e.,
323 * the offset from the very first byte of the complete ACPI table, to the
324 * first byte of the very first subtable.
325 *
326 * On success returns sum of all matching entries for all proc handlers.
327 * Otherwise, -ENODEV or -EINVAL is returned.
328 */
329static int __init_or_acpilib acpi_parse_entries_array(
330 char *id, unsigned long table_size,
331 struct acpi_table_header *table_header, struct acpi_subtable_proc *proc,
332 int proc_num, unsigned int max_entries)
333{
334 struct acpi_subtable_entry entry;
335 unsigned long table_end, subtable_len, entry_len;
336 int count = 0;
337 int errs = 0;
338 int i;
339
340 table_end = (unsigned long)table_header + table_header->length;
341
342 /* Parse all entries looking for a match. */
343
344 entry.type = acpi_get_subtable_type(id);
345 entry.hdr = (union acpi_subtable_headers *)
346 ((unsigned long)table_header + table_size);
347 subtable_len = acpi_get_subtable_header_length(&entry);
348
349 while (((unsigned long)entry.hdr) + subtable_len < table_end) {
350 if (max_entries && count >= max_entries)
351 break;
352
353 for (i = 0; i < proc_num; i++) {
354 if (acpi_get_entry_type(&entry) != proc[i].id)
355 continue;
356 if (!has_handler(&proc[i]) ||
357 (!errs &&
358 call_handler(&proc[i], entry.hdr, table_end))) {
359 errs++;
360 continue;
361 }
362
363 proc[i].count++;
364 break;
365 }
366 if (i != proc_num)
367 count++;
368
369 /*
370 * If entry->length is 0, break from this loop to avoid
371 * infinite loop.
372 */
373 entry_len = acpi_get_entry_length(&entry);
374 if (entry_len == 0) {
375 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
376 return -EINVAL;
377 }
378
379 entry.hdr = (union acpi_subtable_headers *)
380 ((unsigned long)entry.hdr + entry_len);
381 }
382
383 if (max_entries && count > max_entries) {
384 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
385 id, proc->id, count);
386 }
387
388 return errs ? -EINVAL : count;
389}
390
391int __init_or_acpilib acpi_table_parse_entries_array(
392 char *id, unsigned long table_size, struct acpi_subtable_proc *proc,
393 int proc_num, unsigned int max_entries)
394{
395 struct acpi_table_header *table_header = NULL;
396 int count;
397 u32 instance = 0;
398
399 if (acpi_disabled)
400 return -ENODEV;
401
402 if (!id)
403 return -EINVAL;
404
405 if (!table_size)
406 return -EINVAL;
407
408 if (!strncmp(id, ACPI_SIG_MADT, 4))
409 instance = acpi_apic_instance;
410
411 acpi_get_table(id, instance, &table_header);
412 if (!table_header) {
413 pr_debug("%4.4s not present\n", id);
414 return -ENODEV;
415 }
416
417 count = acpi_parse_entries_array(id, table_size, table_header,
418 proc, proc_num, max_entries);
419
420 acpi_put_table(table_header);
421 return count;
422}
423
424static int __init_or_acpilib __acpi_table_parse_entries(
425 char *id, unsigned long table_size, int entry_id,
426 acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg,
427 void *arg, unsigned int max_entries)
428{
429 struct acpi_subtable_proc proc = {
430 .id = entry_id,
431 .handler = handler,
432 .handler_arg = handler_arg,
433 .arg = arg,
434 };
435
436 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
437 max_entries);
438}
439
440int __init_or_acpilib
441acpi_table_parse_cedt(enum acpi_cedt_type id,
442 acpi_tbl_entry_handler_arg handler_arg, void *arg)
443{
444 return __acpi_table_parse_entries(ACPI_SIG_CEDT,
445 sizeof(struct acpi_table_cedt), id,
446 NULL, handler_arg, arg, 0);
447}
448EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt);
449
450int __init acpi_table_parse_entries(char *id, unsigned long table_size,
451 int entry_id,
452 acpi_tbl_entry_handler handler,
453 unsigned int max_entries)
454{
455 return __acpi_table_parse_entries(id, table_size, entry_id, handler,
456 NULL, NULL, max_entries);
457}
458
459int __init acpi_table_parse_madt(enum acpi_madt_type id,
460 acpi_tbl_entry_handler handler, unsigned int max_entries)
461{
462 return acpi_table_parse_entries(ACPI_SIG_MADT,
463 sizeof(struct acpi_table_madt), id,
464 handler, max_entries);
465}
466
467/**
468 * acpi_table_parse - find table with @id, run @handler on it
469 * @id: table id to find
470 * @handler: handler to run
471 *
472 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
473 * run @handler on it.
474 *
475 * Return 0 if table found, -errno if not.
476 */
477int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
478{
479 struct acpi_table_header *table = NULL;
480
481 if (acpi_disabled)
482 return -ENODEV;
483
484 if (!id || !handler)
485 return -EINVAL;
486
487 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
488 acpi_get_table(id, acpi_apic_instance, &table);
489 else
490 acpi_get_table(id, 0, &table);
491
492 if (table) {
493 handler(table);
494 acpi_put_table(table);
495 return 0;
496 } else
497 return -ENODEV;
498}
499
500/*
501 * The BIOS is supposed to supply a single APIC/MADT,
502 * but some report two. Provide a knob to use either.
503 * (don't you wish instance 0 and 1 were not the same?)
504 */
505static void __init check_multiple_madt(void)
506{
507 struct acpi_table_header *table = NULL;
508
509 acpi_get_table(ACPI_SIG_MADT, 2, &table);
510 if (table) {
511 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
512 acpi_apic_instance);
513 pr_warn("If \"acpi_apic_instance=%d\" works better, "
514 "notify linux-acpi@vger.kernel.org\n",
515 acpi_apic_instance ? 0 : 2);
516 acpi_put_table(table);
517
518 } else
519 acpi_apic_instance = 0;
520
521 return;
522}
523
524static void acpi_table_taint(struct acpi_table_header *table)
525{
526 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
527 table->signature, table->oem_table_id);
528 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
529}
530
531#ifdef CONFIG_ACPI_TABLE_UPGRADE
532static u64 acpi_tables_addr;
533static int all_tables_size;
534
535/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
536static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
537{
538 u8 sum = 0;
539 u8 *end = buffer + length;
540
541 while (buffer < end)
542 sum = (u8) (sum + *(buffer++));
543 return sum;
544}
545
546/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
547static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
548 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
549 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
550 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
551 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
552 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
553 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
554 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
555 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
556 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
557 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
558 ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI };
559
560#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
561
562#define NR_ACPI_INITRD_TABLES 64
563static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
564static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
565
566#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
567
568void __init acpi_table_upgrade(void)
569{
570 void *data;
571 size_t size;
572 int sig, no, table_nr = 0, total_offset = 0;
573 long offset = 0;
574 struct acpi_table_header *table;
575 char cpio_path[32] = "kernel/firmware/acpi/";
576 struct cpio_data file;
577
578 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
579 data = __initramfs_start;
580 size = __initramfs_size;
581 } else {
582 data = (void *)initrd_start;
583 size = initrd_end - initrd_start;
584 }
585
586 if (data == NULL || size == 0)
587 return;
588
589 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
590 file = find_cpio_data(cpio_path, data, size, &offset);
591 if (!file.data)
592 break;
593
594 data += offset;
595 size -= offset;
596
597 if (file.size < sizeof(struct acpi_table_header)) {
598 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
599 cpio_path, file.name);
600 continue;
601 }
602
603 table = file.data;
604
605 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
606 if (!memcmp(table->signature, table_sigs[sig], 4))
607 break;
608
609 if (sig >= ARRAY_SIZE(table_sigs)) {
610 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
611 cpio_path, file.name);
612 continue;
613 }
614 if (file.size != table->length) {
615 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
616 cpio_path, file.name);
617 continue;
618 }
619 if (acpi_table_checksum(file.data, table->length)) {
620 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
621 cpio_path, file.name);
622 continue;
623 }
624
625 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
626 table->signature, cpio_path, file.name, table->length);
627
628 all_tables_size += table->length;
629 acpi_initrd_files[table_nr].data = file.data;
630 acpi_initrd_files[table_nr].size = file.size;
631 table_nr++;
632 }
633 if (table_nr == 0)
634 return;
635
636 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
637 pr_notice("kernel is locked down, ignoring table override\n");
638 return;
639 }
640
641 acpi_tables_addr =
642 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE,
643 0, ACPI_TABLE_UPGRADE_MAX_PHYS);
644 if (!acpi_tables_addr) {
645 WARN_ON(1);
646 return;
647 }
648 /*
649 * Only calling e820_add_reserve does not work and the
650 * tables are invalid (memory got used) later.
651 * memblock_reserve works as expected and the tables won't get modified.
652 * But it's not enough on X86 because ioremap will
653 * complain later (used by acpi_os_map_memory) that the pages
654 * that should get mapped are not marked "reserved".
655 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
656 * works fine.
657 */
658 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
659
660 kmemleak_ignore_phys(acpi_tables_addr);
661
662 /*
663 * early_ioremap only can remap 256k one time. If we map all
664 * tables one time, we will hit the limit. Need to map chunks
665 * one by one during copying the same as that in relocate_initrd().
666 */
667 for (no = 0; no < table_nr; no++) {
668 unsigned char *src_p = acpi_initrd_files[no].data;
669 phys_addr_t size = acpi_initrd_files[no].size;
670 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
671 phys_addr_t slop, clen;
672 char *dest_p;
673
674 total_offset += size;
675
676 while (size) {
677 slop = dest_addr & ~PAGE_MASK;
678 clen = size;
679 if (clen > MAP_CHUNK_SIZE - slop)
680 clen = MAP_CHUNK_SIZE - slop;
681 dest_p = early_memremap(dest_addr & PAGE_MASK,
682 clen + slop);
683 memcpy(dest_p + slop, src_p, clen);
684 early_memunmap(dest_p, clen + slop);
685 src_p += clen;
686 dest_addr += clen;
687 size -= clen;
688 }
689 }
690}
691
692static acpi_status
693acpi_table_initrd_override(struct acpi_table_header *existing_table,
694 acpi_physical_address *address, u32 *length)
695{
696 int table_offset = 0;
697 int table_index = 0;
698 struct acpi_table_header *table;
699 u32 table_length;
700
701 *length = 0;
702 *address = 0;
703 if (!acpi_tables_addr)
704 return AE_OK;
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 AE_OK;
713 }
714
715 table_length = table->length;
716
717 /* Only override tables matched */
718 if (memcmp(existing_table->signature, table->signature, 4) ||
719 memcmp(table->oem_id, existing_table->oem_id,
720 ACPI_OEM_ID_SIZE) ||
721 memcmp(table->oem_table_id, existing_table->oem_table_id,
722 ACPI_OEM_TABLE_ID_SIZE)) {
723 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
724 goto next_table;
725 }
726 /*
727 * Mark the table to avoid being used in
728 * acpi_table_initrd_scan() and check the revision.
729 */
730 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
731 existing_table->oem_revision >= table->oem_revision) {
732 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
733 goto next_table;
734 }
735
736 *length = table_length;
737 *address = acpi_tables_addr + table_offset;
738 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
739 table->signature, table->oem_id,
740 table->oem_table_id);
741 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
742 break;
743
744next_table:
745 table_offset += table_length;
746 table_index++;
747 }
748 return AE_OK;
749}
750
751static void __init acpi_table_initrd_scan(void)
752{
753 int table_offset = 0;
754 int table_index = 0;
755 u32 table_length;
756 struct acpi_table_header *table;
757
758 if (!acpi_tables_addr)
759 return;
760
761 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
762 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
763 ACPI_HEADER_SIZE);
764 if (table_offset + table->length > all_tables_size) {
765 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
766 WARN_ON(1);
767 return;
768 }
769
770 table_length = table->length;
771
772 /* Skip RSDT/XSDT which should only be used for override */
773 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
774 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
775 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
776 goto next_table;
777 }
778 /*
779 * Mark the table to avoid being used in
780 * acpi_table_initrd_override(). Though this is not possible
781 * because override is disabled in acpi_install_physical_table().
782 */
783 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
784 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
785 goto next_table;
786 }
787
788 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
789 table->signature, table->oem_id,
790 table->oem_table_id);
791 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
792 acpi_install_physical_table(acpi_tables_addr + table_offset);
793next_table:
794 table_offset += table_length;
795 table_index++;
796 }
797}
798#else
799static acpi_status
800acpi_table_initrd_override(struct acpi_table_header *existing_table,
801 acpi_physical_address *address,
802 u32 *table_length)
803{
804 *table_length = 0;
805 *address = 0;
806 return AE_OK;
807}
808
809static void __init acpi_table_initrd_scan(void)
810{
811}
812#endif /* CONFIG_ACPI_TABLE_UPGRADE */
813
814acpi_status
815acpi_os_physical_table_override(struct acpi_table_header *existing_table,
816 acpi_physical_address *address,
817 u32 *table_length)
818{
819 return acpi_table_initrd_override(existing_table, address,
820 table_length);
821}
822
823#ifdef CONFIG_ACPI_CUSTOM_DSDT
824static void *amlcode __attribute__ ((weakref("AmlCode")));
825static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
826#endif
827
828acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
829 struct acpi_table_header **new_table)
830{
831 if (!existing_table || !new_table)
832 return AE_BAD_PARAMETER;
833
834 *new_table = NULL;
835
836#ifdef CONFIG_ACPI_CUSTOM_DSDT
837 if (!strncmp(existing_table->signature, "DSDT", 4)) {
838 *new_table = (struct acpi_table_header *)&amlcode;
839 if (!(*new_table))
840 *new_table = (struct acpi_table_header *)&dsdt_amlcode;
841 }
842#endif
843 if (*new_table != NULL)
844 acpi_table_taint(existing_table);
845 return AE_OK;
846}
847
848/*
849 * acpi_locate_initial_tables()
850 *
851 * Get the RSDP, then find and checksum all the ACPI tables.
852 *
853 * result: initial_tables[] is initialized, and points to
854 * a list of ACPI tables.
855 */
856int __init acpi_locate_initial_tables(void)
857{
858 acpi_status status;
859
860 if (acpi_verify_table_checksum) {
861 pr_info("Early table checksum verification enabled\n");
862 acpi_gbl_enable_table_validation = TRUE;
863 } else {
864 pr_info("Early table checksum verification disabled\n");
865 acpi_gbl_enable_table_validation = FALSE;
866 }
867
868 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
869 if (ACPI_FAILURE(status))
870 return -EINVAL;
871
872 return 0;
873}
874
875void __init acpi_reserve_initial_tables(void)
876{
877 int i;
878
879 for (i = 0; i < ACPI_MAX_TABLES; i++) {
880 struct acpi_table_desc *table_desc = &initial_tables[i];
881 u64 start = table_desc->address;
882 u64 size = table_desc->length;
883
884 if (!start || !size)
885 break;
886
887 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
888 table_desc->signature.ascii, start, start + size - 1);
889
890 memblock_reserve(start, size);
891 }
892}
893
894void __init acpi_table_init_complete(void)
895{
896 acpi_table_initrd_scan();
897 check_multiple_madt();
898}
899
900int __init acpi_table_init(void)
901{
902 int ret;
903
904 ret = acpi_locate_initial_tables();
905 if (ret)
906 return ret;
907
908 acpi_table_init_complete();
909
910 return 0;
911}
912
913static int __init acpi_parse_apic_instance(char *str)
914{
915 if (!str)
916 return -EINVAL;
917
918 if (kstrtoint(str, 0, &acpi_apic_instance))
919 return -EINVAL;
920
921 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
922
923 return 0;
924}
925early_param("acpi_apic_instance", acpi_parse_apic_instance);
926
927static int __init acpi_force_table_verification_setup(char *s)
928{
929 acpi_verify_table_checksum = true;
930
931 return 0;
932}
933early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
934
935static int __init acpi_force_32bit_fadt_addr(char *s)
936{
937 pr_info("Forcing 32 Bit FADT addresses\n");
938 acpi_gbl_use32_bit_fadt_addresses = TRUE;
939
940 return 0;
941}
942early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);