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