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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_MULTIPROC_WAKEUP:
202 {
203 struct acpi_madt_multiproc_wakeup *p =
204 (struct acpi_madt_multiproc_wakeup *)header;
205 u64 reset_vector = 0;
206
207 if (p->version >= ACPI_MADT_MP_WAKEUP_VERSION_V1)
208 reset_vector = p->reset_vector;
209
210 pr_debug("MP Wakeup (version[%d], mailbox[%#llx], reset[%#llx])\n",
211 p->version, p->mailbox_address, reset_vector);
212 }
213 break;
214
215 case ACPI_MADT_TYPE_CORE_PIC:
216 {
217 struct acpi_madt_core_pic *p = (struct acpi_madt_core_pic *)header;
218
219 pr_debug("CORE PIC (processor_id[0x%02x] core_id[0x%02x] %s)\n",
220 p->processor_id, p->core_id,
221 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
222 }
223 break;
224
225 case ACPI_MADT_TYPE_RINTC:
226 {
227 struct acpi_madt_rintc *p = (struct acpi_madt_rintc *)header;
228
229 pr_debug("RISC-V INTC (acpi_uid[0x%04x] hart_id[0x%llx] %s)\n",
230 p->uid, p->hart_id,
231 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
232 }
233 break;
234
235 default:
236 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
237 header->type);
238 break;
239 }
240}
241
242int __init_or_acpilib acpi_table_parse_entries_array(
243 char *id, unsigned long table_size, struct acpi_subtable_proc *proc,
244 int proc_num, unsigned int max_entries)
245{
246 struct acpi_table_header *table_header = NULL;
247 int count;
248 u32 instance = 0;
249
250 if (acpi_disabled)
251 return -ENODEV;
252
253 if (!id)
254 return -EINVAL;
255
256 if (!table_size)
257 return -EINVAL;
258
259 if (!strncmp(id, ACPI_SIG_MADT, 4))
260 instance = acpi_apic_instance;
261
262 acpi_get_table(id, instance, &table_header);
263 if (!table_header) {
264 pr_debug("%4.4s not present\n", id);
265 return -ENODEV;
266 }
267
268 count = acpi_parse_entries_array(id, table_size,
269 (union fw_table_header *)table_header,
270 0, proc, proc_num, max_entries);
271
272 acpi_put_table(table_header);
273 return count;
274}
275
276static int __init_or_acpilib __acpi_table_parse_entries(
277 char *id, unsigned long table_size, int entry_id,
278 acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg,
279 void *arg, unsigned int max_entries)
280{
281 struct acpi_subtable_proc proc = {
282 .id = entry_id,
283 .handler = handler,
284 .handler_arg = handler_arg,
285 .arg = arg,
286 };
287
288 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
289 max_entries);
290}
291
292int __init_or_acpilib
293acpi_table_parse_cedt(enum acpi_cedt_type id,
294 acpi_tbl_entry_handler_arg handler_arg, void *arg)
295{
296 return __acpi_table_parse_entries(ACPI_SIG_CEDT,
297 sizeof(struct acpi_table_cedt), id,
298 NULL, handler_arg, arg, 0);
299}
300EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt);
301
302int __init acpi_table_parse_entries(char *id, unsigned long table_size,
303 int entry_id,
304 acpi_tbl_entry_handler handler,
305 unsigned int max_entries)
306{
307 return __acpi_table_parse_entries(id, table_size, entry_id, handler,
308 NULL, NULL, max_entries);
309}
310
311int __init acpi_table_parse_madt(enum acpi_madt_type id,
312 acpi_tbl_entry_handler handler, unsigned int max_entries)
313{
314 return acpi_table_parse_entries(ACPI_SIG_MADT,
315 sizeof(struct acpi_table_madt), id,
316 handler, max_entries);
317}
318
319/**
320 * acpi_table_parse - find table with @id, run @handler on it
321 * @id: table id to find
322 * @handler: handler to run
323 *
324 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
325 * run @handler on it.
326 *
327 * Return 0 if table found, -errno if not.
328 */
329int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
330{
331 struct acpi_table_header *table = NULL;
332
333 if (acpi_disabled)
334 return -ENODEV;
335
336 if (!id || !handler)
337 return -EINVAL;
338
339 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
340 acpi_get_table(id, acpi_apic_instance, &table);
341 else
342 acpi_get_table(id, 0, &table);
343
344 if (table) {
345 handler(table);
346 acpi_put_table(table);
347 return 0;
348 } else
349 return -ENODEV;
350}
351
352/*
353 * The BIOS is supposed to supply a single APIC/MADT,
354 * but some report two. Provide a knob to use either.
355 * (don't you wish instance 0 and 1 were not the same?)
356 */
357static void __init check_multiple_madt(void)
358{
359 struct acpi_table_header *table = NULL;
360
361 acpi_get_table(ACPI_SIG_MADT, 2, &table);
362 if (table) {
363 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
364 acpi_apic_instance);
365 pr_warn("If \"acpi_apic_instance=%d\" works better, "
366 "notify linux-acpi@vger.kernel.org\n",
367 acpi_apic_instance ? 0 : 2);
368 acpi_put_table(table);
369
370 } else
371 acpi_apic_instance = 0;
372
373 return;
374}
375
376static void acpi_table_taint(struct acpi_table_header *table)
377{
378 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
379 table->signature, table->oem_table_id);
380 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
381}
382
383#ifdef CONFIG_ACPI_TABLE_UPGRADE
384static u64 acpi_tables_addr;
385static int all_tables_size;
386
387/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
388static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
389{
390 u8 sum = 0;
391 u8 *end = buffer + length;
392
393 while (buffer < end)
394 sum = (u8) (sum + *(buffer++));
395 return sum;
396}
397
398/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
399static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
400 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
401 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
402 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
403 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
404 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
405 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
406 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
407 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
408 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
409 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
410 ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI,
411 ACPI_SIG_NBFT };
412
413#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
414
415#define NR_ACPI_INITRD_TABLES 64
416static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
417static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
418
419#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
420
421void __init acpi_table_upgrade(void)
422{
423 void *data;
424 size_t size;
425 int sig, no, table_nr = 0, total_offset = 0;
426 long offset = 0;
427 struct acpi_table_header *table;
428 char cpio_path[32] = "kernel/firmware/acpi/";
429 struct cpio_data file;
430
431 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
432 data = __initramfs_start;
433 size = __initramfs_size;
434 } else {
435 data = (void *)initrd_start;
436 size = initrd_end - initrd_start;
437 }
438
439 if (data == NULL || size == 0)
440 return;
441
442 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
443 file = find_cpio_data(cpio_path, data, size, &offset);
444 if (!file.data)
445 break;
446
447 data += offset;
448 size -= offset;
449
450 if (file.size < sizeof(struct acpi_table_header)) {
451 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
452 cpio_path, file.name);
453 continue;
454 }
455
456 table = file.data;
457
458 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
459 if (!memcmp(table->signature, table_sigs[sig], 4))
460 break;
461
462 if (sig >= ARRAY_SIZE(table_sigs)) {
463 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
464 cpio_path, file.name);
465 continue;
466 }
467 if (file.size != table->length) {
468 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
469 cpio_path, file.name);
470 continue;
471 }
472 if (acpi_table_checksum(file.data, table->length)) {
473 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
474 cpio_path, file.name);
475 continue;
476 }
477
478 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
479 table->signature, cpio_path, file.name, table->length);
480
481 all_tables_size += table->length;
482 acpi_initrd_files[table_nr].data = file.data;
483 acpi_initrd_files[table_nr].size = file.size;
484 table_nr++;
485 }
486 if (table_nr == 0)
487 return;
488
489 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
490 pr_notice("kernel is locked down, ignoring table override\n");
491 return;
492 }
493
494 acpi_tables_addr =
495 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE,
496 0, ACPI_TABLE_UPGRADE_MAX_PHYS);
497 if (!acpi_tables_addr) {
498 WARN_ON(1);
499 return;
500 }
501 /*
502 * Only calling e820_add_reserve does not work and the
503 * tables are invalid (memory got used) later.
504 * memblock_reserve works as expected and the tables won't get modified.
505 * But it's not enough on X86 because ioremap will
506 * complain later (used by acpi_os_map_memory) that the pages
507 * that should get mapped are not marked "reserved".
508 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
509 * works fine.
510 */
511 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
512
513 kmemleak_ignore_phys(acpi_tables_addr);
514
515 /*
516 * early_ioremap only can remap 256k one time. If we map all
517 * tables one time, we will hit the limit. Need to map chunks
518 * one by one during copying the same as that in relocate_initrd().
519 */
520 for (no = 0; no < table_nr; no++) {
521 unsigned char *src_p = acpi_initrd_files[no].data;
522 phys_addr_t size = acpi_initrd_files[no].size;
523 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
524 phys_addr_t slop, clen;
525 char *dest_p;
526
527 total_offset += size;
528
529 while (size) {
530 slop = dest_addr & ~PAGE_MASK;
531 clen = size;
532 if (clen > MAP_CHUNK_SIZE - slop)
533 clen = MAP_CHUNK_SIZE - slop;
534 dest_p = early_memremap(dest_addr & PAGE_MASK,
535 clen + slop);
536 memcpy(dest_p + slop, src_p, clen);
537 early_memunmap(dest_p, clen + slop);
538 src_p += clen;
539 dest_addr += clen;
540 size -= clen;
541 }
542 }
543}
544
545static acpi_status
546acpi_table_initrd_override(struct acpi_table_header *existing_table,
547 acpi_physical_address *address, u32 *length)
548{
549 int table_offset = 0;
550 int table_index = 0;
551 struct acpi_table_header *table;
552 u32 table_length;
553
554 *length = 0;
555 *address = 0;
556 if (!acpi_tables_addr)
557 return AE_OK;
558
559 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
560 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
561 ACPI_HEADER_SIZE);
562 if (table_offset + table->length > all_tables_size) {
563 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
564 WARN_ON(1);
565 return AE_OK;
566 }
567
568 table_length = table->length;
569
570 /* Only override tables matched */
571 if (memcmp(existing_table->signature, table->signature, 4) ||
572 memcmp(table->oem_id, existing_table->oem_id,
573 ACPI_OEM_ID_SIZE) ||
574 memcmp(table->oem_table_id, existing_table->oem_table_id,
575 ACPI_OEM_TABLE_ID_SIZE)) {
576 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
577 goto next_table;
578 }
579 /*
580 * Mark the table to avoid being used in
581 * acpi_table_initrd_scan() and check the revision.
582 */
583 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
584 existing_table->oem_revision >= table->oem_revision) {
585 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
586 goto next_table;
587 }
588
589 *length = table_length;
590 *address = acpi_tables_addr + table_offset;
591 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
592 table->signature, table->oem_id,
593 table->oem_table_id);
594 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
595 break;
596
597next_table:
598 table_offset += table_length;
599 table_index++;
600 }
601 return AE_OK;
602}
603
604static void __init acpi_table_initrd_scan(void)
605{
606 int table_offset = 0;
607 int table_index = 0;
608 u32 table_length;
609 struct acpi_table_header *table;
610
611 if (!acpi_tables_addr)
612 return;
613
614 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
615 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
616 ACPI_HEADER_SIZE);
617 if (table_offset + table->length > all_tables_size) {
618 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
619 WARN_ON(1);
620 return;
621 }
622
623 table_length = table->length;
624
625 /* Skip RSDT/XSDT which should only be used for override */
626 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
627 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
628 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
629 goto next_table;
630 }
631 /*
632 * Mark the table to avoid being used in
633 * acpi_table_initrd_override(). Though this is not possible
634 * because override is disabled in acpi_install_physical_table().
635 */
636 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
637 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
638 goto next_table;
639 }
640
641 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
642 table->signature, table->oem_id,
643 table->oem_table_id);
644 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
645 acpi_install_physical_table(acpi_tables_addr + table_offset);
646next_table:
647 table_offset += table_length;
648 table_index++;
649 }
650}
651#else
652static acpi_status
653acpi_table_initrd_override(struct acpi_table_header *existing_table,
654 acpi_physical_address *address,
655 u32 *table_length)
656{
657 *table_length = 0;
658 *address = 0;
659 return AE_OK;
660}
661
662static void __init acpi_table_initrd_scan(void)
663{
664}
665#endif /* CONFIG_ACPI_TABLE_UPGRADE */
666
667acpi_status
668acpi_os_physical_table_override(struct acpi_table_header *existing_table,
669 acpi_physical_address *address,
670 u32 *table_length)
671{
672 return acpi_table_initrd_override(existing_table, address,
673 table_length);
674}
675
676#ifdef CONFIG_ACPI_CUSTOM_DSDT
677static void *amlcode __attribute__ ((weakref("AmlCode")));
678static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
679#endif
680
681acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
682 struct acpi_table_header **new_table)
683{
684 if (!existing_table || !new_table)
685 return AE_BAD_PARAMETER;
686
687 *new_table = NULL;
688
689#ifdef CONFIG_ACPI_CUSTOM_DSDT
690 if (!strncmp(existing_table->signature, "DSDT", 4)) {
691 *new_table = (struct acpi_table_header *)&amlcode;
692 if (!(*new_table))
693 *new_table = (struct acpi_table_header *)&dsdt_amlcode;
694 }
695#endif
696 if (*new_table != NULL)
697 acpi_table_taint(existing_table);
698 return AE_OK;
699}
700
701/*
702 * acpi_locate_initial_tables()
703 *
704 * Get the RSDP, then find and checksum all the ACPI tables.
705 *
706 * result: initial_tables[] is initialized, and points to
707 * a list of ACPI tables.
708 */
709int __init acpi_locate_initial_tables(void)
710{
711 acpi_status status;
712
713 if (acpi_verify_table_checksum) {
714 pr_info("Early table checksum verification enabled\n");
715 acpi_gbl_enable_table_validation = TRUE;
716 } else {
717 pr_info("Early table checksum verification disabled\n");
718 acpi_gbl_enable_table_validation = FALSE;
719 }
720
721 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
722 if (ACPI_FAILURE(status))
723 return -EINVAL;
724
725 return 0;
726}
727
728void __init acpi_reserve_initial_tables(void)
729{
730 int i;
731
732 for (i = 0; i < ACPI_MAX_TABLES; i++) {
733 struct acpi_table_desc *table_desc = &initial_tables[i];
734 u64 start = table_desc->address;
735 u64 size = table_desc->length;
736
737 if (!start || !size)
738 break;
739
740 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
741 table_desc->signature.ascii, start, start + size - 1);
742
743 memblock_reserve(start, size);
744 }
745}
746
747void __init acpi_table_init_complete(void)
748{
749 acpi_table_initrd_scan();
750 check_multiple_madt();
751}
752
753int __init acpi_table_init(void)
754{
755 int ret;
756
757 ret = acpi_locate_initial_tables();
758 if (ret)
759 return ret;
760
761 acpi_table_init_complete();
762
763 return 0;
764}
765
766static int __init acpi_parse_apic_instance(char *str)
767{
768 if (!str)
769 return -EINVAL;
770
771 if (kstrtoint(str, 0, &acpi_apic_instance))
772 return -EINVAL;
773
774 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
775
776 return 0;
777}
778early_param("acpi_apic_instance", acpi_parse_apic_instance);
779
780static int __init acpi_force_table_verification_setup(char *s)
781{
782 acpi_verify_table_checksum = true;
783
784 return 0;
785}
786early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
787
788static int __init acpi_force_32bit_fadt_addr(char *s)
789{
790 pr_info("Forcing 32 Bit FADT addresses\n");
791 acpi_gbl_use32_bit_fadt_addresses = TRUE;
792
793 return 0;
794}
795early_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);