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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 <[email protected]>
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 <asm/fixmap.h>
26#include "internal.h"
27
28#ifdef CONFIG_ACPI_CUSTOM_DSDT
29#include CONFIG_ACPI_CUSTOM_DSDT_FILE
30#endif
31
32#define ACPI_MAX_TABLES 128
33
34static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
35static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
36
37static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
38
39static int acpi_apic_instance __initdata_or_acpilib;
40
41/*
42 * Disable table checksum verification for the early stage due to the size
43 * limitation of the current x86 early mapping implementation.
44 */
45static bool acpi_verify_table_checksum __initdata_or_acpilib = false;
46
47void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
48{
49 if (!header)
50 return;
51
52 switch (header->type) {
53
54 case ACPI_MADT_TYPE_LOCAL_APIC:
55 {
56 struct acpi_madt_local_apic *p =
57 (struct acpi_madt_local_apic *)header;
58 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
59 p->processor_id, p->id,
60 str_enabled_disabled(p->lapic_flags & ACPI_MADT_ENABLED));
61 }
62 break;
63
64 case ACPI_MADT_TYPE_LOCAL_X2APIC:
65 {
66 struct acpi_madt_local_x2apic *p =
67 (struct acpi_madt_local_x2apic *)header;
68 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
69 p->local_apic_id, p->uid,
70 str_enabled_disabled(p->lapic_flags & ACPI_MADT_ENABLED));
71 }
72 break;
73
74 case ACPI_MADT_TYPE_IO_APIC:
75 {
76 struct acpi_madt_io_apic *p =
77 (struct acpi_madt_io_apic *)header;
78 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
79 p->id, p->address, p->global_irq_base);
80 }
81 break;
82
83 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
84 {
85 struct acpi_madt_interrupt_override *p =
86 (struct acpi_madt_interrupt_override *)header;
87 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
88 p->bus, p->source_irq, p->global_irq,
89 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
90 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
91 if (p->inti_flags &
92 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
93 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
94 p->inti_flags &
95 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
96 }
97 break;
98
99 case ACPI_MADT_TYPE_NMI_SOURCE:
100 {
101 struct acpi_madt_nmi_source *p =
102 (struct acpi_madt_nmi_source *)header;
103 pr_info("NMI_SRC (%s %s global_irq %d)\n",
104 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
105 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
106 p->global_irq);
107 }
108 break;
109
110 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
111 {
112 struct acpi_madt_local_apic_nmi *p =
113 (struct acpi_madt_local_apic_nmi *)header;
114 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
115 p->processor_id,
116 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
117 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
118 p->lint);
119 }
120 break;
121
122 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
123 {
124 u16 polarity, trigger;
125 struct acpi_madt_local_x2apic_nmi *p =
126 (struct acpi_madt_local_x2apic_nmi *)header;
127
128 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
129 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
130
131 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
132 p->uid,
133 mps_inti_flags_polarity[polarity],
134 mps_inti_flags_trigger[trigger],
135 p->lint);
136 }
137 break;
138
139 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
140 {
141 struct acpi_madt_local_apic_override *p =
142 (struct acpi_madt_local_apic_override *)header;
143 pr_info("LAPIC_ADDR_OVR (address[0x%llx])\n",
144 p->address);
145 }
146 break;
147
148 case ACPI_MADT_TYPE_IO_SAPIC:
149 {
150 struct acpi_madt_io_sapic *p =
151 (struct acpi_madt_io_sapic *)header;
152 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
153 p->id, (void *)(unsigned long)p->address,
154 p->global_irq_base);
155 }
156 break;
157
158 case ACPI_MADT_TYPE_LOCAL_SAPIC:
159 {
160 struct acpi_madt_local_sapic *p =
161 (struct acpi_madt_local_sapic *)header;
162 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
163 p->processor_id, p->id, p->eid,
164 str_enabled_disabled(p->lapic_flags & ACPI_MADT_ENABLED));
165 }
166 break;
167
168 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
169 {
170 struct acpi_madt_interrupt_source *p =
171 (struct acpi_madt_interrupt_source *)header;
172 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",
173 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
174 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
175 p->type, p->id, p->eid, p->io_sapic_vector,
176 p->global_irq);
177 }
178 break;
179
180 case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
181 {
182 struct acpi_madt_generic_interrupt *p =
183 (struct acpi_madt_generic_interrupt *)header;
184 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
185 p->uid, p->base_address,
186 p->arm_mpidr,
187 str_enabled_disabled(p->flags & ACPI_MADT_ENABLED));
188
189 }
190 break;
191
192 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
193 {
194 struct acpi_madt_generic_distributor *p =
195 (struct acpi_madt_generic_distributor *)header;
196 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
197 p->gic_id, p->base_address,
198 p->global_irq_base);
199 }
200 break;
201
202 case ACPI_MADT_TYPE_MULTIPROC_WAKEUP:
203 {
204 struct acpi_madt_multiproc_wakeup *p =
205 (struct acpi_madt_multiproc_wakeup *)header;
206 u64 reset_vector = 0;
207
208 if (p->version >= ACPI_MADT_MP_WAKEUP_VERSION_V1)
209 reset_vector = p->reset_vector;
210
211 pr_debug("MP Wakeup (version[%d], mailbox[%#llx], reset[%#llx])\n",
212 p->version, p->mailbox_address, reset_vector);
213 }
214 break;
215
216 case ACPI_MADT_TYPE_CORE_PIC:
217 {
218 struct acpi_madt_core_pic *p = (struct acpi_madt_core_pic *)header;
219
220 pr_debug("CORE PIC (processor_id[0x%02x] core_id[0x%02x] %s)\n",
221 p->processor_id, p->core_id,
222 str_enabled_disabled(p->flags & ACPI_MADT_ENABLED));
223 }
224 break;
225
226 case ACPI_MADT_TYPE_RINTC:
227 {
228 struct acpi_madt_rintc *p = (struct acpi_madt_rintc *)header;
229
230 pr_debug("RISC-V INTC (acpi_uid[0x%04x] hart_id[0x%llx] %s)\n",
231 p->uid, p->hart_id,
232 str_enabled_disabled(p->flags & ACPI_MADT_ENABLED));
233 }
234 break;
235
236 default:
237 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
238 header->type);
239 break;
240 }
241}
242
243int __init_or_acpilib acpi_table_parse_entries_array(
244 char *id, unsigned long table_size, struct acpi_subtable_proc *proc,
245 int proc_num, unsigned int max_entries)
246{
247 struct acpi_table_header *table_header = NULL;
248 int count;
249 u32 instance = 0;
250
251 if (acpi_disabled)
252 return -ENODEV;
253
254 if (!id)
255 return -EINVAL;
256
257 if (!table_size)
258 return -EINVAL;
259
260 if (!strncmp(id, ACPI_SIG_MADT, 4))
261 instance = acpi_apic_instance;
262
263 acpi_get_table(id, instance, &table_header);
264 if (!table_header) {
265 pr_debug("%4.4s not present\n", id);
266 return -ENODEV;
267 }
268
269 count = acpi_parse_entries_array(id, table_size,
270 (union fw_table_header *)table_header,
271 0, proc, proc_num, max_entries);
272
273 acpi_put_table(table_header);
274 return count;
275}
276
277static int __init_or_acpilib __acpi_table_parse_entries(
278 char *id, unsigned long table_size, int entry_id,
279 acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg,
280 void *arg, unsigned int max_entries)
281{
282 struct acpi_subtable_proc proc = {
283 .id = entry_id,
284 .handler = handler,
285 .handler_arg = handler_arg,
286 .arg = arg,
287 };
288
289 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
290 max_entries);
291}
292
293int __init_or_acpilib
294acpi_table_parse_cedt(enum acpi_cedt_type id,
295 acpi_tbl_entry_handler_arg handler_arg, void *arg)
296{
297 return __acpi_table_parse_entries(ACPI_SIG_CEDT,
298 sizeof(struct acpi_table_cedt), id,
299 NULL, handler_arg, arg, 0);
300}
301EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt);
302
303int __init acpi_table_parse_entries(char *id, unsigned long table_size,
304 int entry_id,
305 acpi_tbl_entry_handler handler,
306 unsigned int max_entries)
307{
308 return __acpi_table_parse_entries(id, table_size, entry_id, handler,
309 NULL, NULL, max_entries);
310}
311
312int __init acpi_table_parse_madt(enum acpi_madt_type id,
313 acpi_tbl_entry_handler handler, unsigned int max_entries)
314{
315 return acpi_table_parse_entries(ACPI_SIG_MADT,
316 sizeof(struct acpi_table_madt), id,
317 handler, max_entries);
318}
319
320/**
321 * acpi_table_parse - find table with @id, run @handler on it
322 * @id: table id to find
323 * @handler: handler to run
324 *
325 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
326 * run @handler on it.
327 *
328 * Return 0 if table found, -errno if not.
329 */
330int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
331{
332 struct acpi_table_header *table = NULL;
333
334 if (acpi_disabled)
335 return -ENODEV;
336
337 if (!id || !handler)
338 return -EINVAL;
339
340 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
341 acpi_get_table(id, acpi_apic_instance, &table);
342 else
343 acpi_get_table(id, 0, &table);
344
345 if (table) {
346 handler(table);
347 acpi_put_table(table);
348 return 0;
349 } else
350 return -ENODEV;
351}
352
353/*
354 * The BIOS is supposed to supply a single APIC/MADT,
355 * but some report two. Provide a knob to use either.
356 * (don't you wish instance 0 and 1 were not the same?)
357 */
358static void __init check_multiple_madt(void)
359{
360 struct acpi_table_header *table = NULL;
361
362 acpi_get_table(ACPI_SIG_MADT, 2, &table);
363 if (table) {
364 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
365 acpi_apic_instance);
366 pr_warn("If \"acpi_apic_instance=%d\" works better, "
367 "notify [email protected]\n",
368 acpi_apic_instance ? 0 : 2);
369 acpi_put_table(table);
370
371 } else
372 acpi_apic_instance = 0;
373
374 return;
375}
376
377static void acpi_table_taint(struct acpi_table_header *table)
378{
379 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
380 table->signature, table->oem_table_id);
381 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
382}
383
384#ifdef CONFIG_ACPI_TABLE_UPGRADE
385static u64 acpi_tables_addr;
386static int all_tables_size;
387
388/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
389static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
390{
391 u8 sum = 0;
392 u8 *end = buffer + length;
393
394 while (buffer < end)
395 sum = (u8) (sum + *(buffer++));
396 return sum;
397}
398
399/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
400static const char table_sigs[][ACPI_NAMESEG_SIZE] __nonstring_array __initconst = {
401 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
402 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
403 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
404 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
405 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
406 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
407 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
408 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
409 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
410 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
411 ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI,
412 ACPI_SIG_NBFT, ACPI_SIG_SWFT, ACPI_SIG_MPAM};
413
414#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
415
416#define NR_ACPI_INITRD_TABLES 64
417static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
418static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
419
420#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
421
422void __init acpi_table_upgrade(void)
423{
424 void *data;
425 size_t size;
426 int sig, no, table_nr = 0, total_offset = 0;
427 long offset = 0;
428 struct acpi_table_header *table;
429 char cpio_path[32] = "kernel/firmware/acpi/";
430 struct cpio_data file;
431
432 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
433 data = __initramfs_start;
434 size = __initramfs_size;
435 } else {
436 data = (void *)initrd_start;
437 size = initrd_end - initrd_start;
438 }
439
440 if (data == NULL || size == 0)
441 return;
442
443 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
444 file = find_cpio_data(cpio_path, data, size, &offset);
445 if (!file.data)
446 break;
447
448 data += offset;
449 size -= offset;
450
451 if (file.size < sizeof(struct acpi_table_header)) {
452 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
453 cpio_path, file.name);
454 continue;
455 }
456
457 table = file.data;
458
459 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
460 if (!memcmp(table->signature, table_sigs[sig], 4))
461 break;
462
463 if (sig >= ARRAY_SIZE(table_sigs)) {
464 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
465 cpio_path, file.name);
466 continue;
467 }
468 if (file.size != table->length) {
469 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
470 cpio_path, file.name);
471 continue;
472 }
473 if (acpi_table_checksum(file.data, table->length)) {
474 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
475 cpio_path, file.name);
476 continue;
477 }
478
479 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
480 table->signature, cpio_path, file.name, table->length);
481
482 all_tables_size += table->length;
483 acpi_initrd_files[table_nr].data = file.data;
484 acpi_initrd_files[table_nr].size = file.size;
485 table_nr++;
486 }
487 if (table_nr == 0)
488 return;
489
490 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
491 pr_notice("kernel is locked down, ignoring table override\n");
492 return;
493 }
494
495 acpi_tables_addr =
496 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE,
497 0, ACPI_TABLE_UPGRADE_MAX_PHYS);
498 if (!acpi_tables_addr) {
499 WARN_ON(1);
500 return;
501 }
502 /*
503 * Only calling e820_add_reserve does not work and the
504 * tables are invalid (memory got used) later.
505 * memblock_reserve works as expected and the tables won't get modified.
506 * But it's not enough on X86 because ioremap will
507 * complain later (used by acpi_os_map_memory) that the pages
508 * that should get mapped are not marked "reserved".
509 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
510 * works fine.
511 */
512 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
513
514 kmemleak_ignore_phys(acpi_tables_addr);
515
516 /*
517 * early_ioremap only can remap 256k one time. If we map all
518 * tables one time, we will hit the limit. Need to map chunks
519 * one by one during copying the same as that in relocate_initrd().
520 */
521 for (no = 0; no < table_nr; no++) {
522 unsigned char *src_p = acpi_initrd_files[no].data;
523 phys_addr_t size = acpi_initrd_files[no].size;
524 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
525 phys_addr_t slop, clen;
526 char *dest_p;
527
528 total_offset += size;
529
530 while (size) {
531 slop = dest_addr & ~PAGE_MASK;
532 clen = size;
533 if (clen > MAP_CHUNK_SIZE - slop)
534 clen = MAP_CHUNK_SIZE - slop;
535 dest_p = early_memremap(dest_addr & PAGE_MASK,
536 clen + slop);
537 memcpy(dest_p + slop, src_p, clen);
538 early_memunmap(dest_p, clen + slop);
539 src_p += clen;
540 dest_addr += clen;
541 size -= clen;
542 }
543 }
544}
545
546static acpi_status
547acpi_table_initrd_override(struct acpi_table_header *existing_table,
548 acpi_physical_address *address, u32 *length)
549{
550 int table_offset = 0;
551 int table_index = 0;
552 struct acpi_table_header *table;
553 u32 table_length;
554
555 *length = 0;
556 *address = 0;
557 if (!acpi_tables_addr)
558 return AE_OK;
559
560 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
561 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
562 ACPI_HEADER_SIZE);
563 if (table_offset + table->length > all_tables_size) {
564 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
565 WARN_ON(1);
566 return AE_OK;
567 }
568
569 table_length = table->length;
570
571 /* Only override tables matched */
572 if (memcmp(existing_table->signature, table->signature, 4) ||
573 memcmp(table->oem_id, existing_table->oem_id,
574 ACPI_OEM_ID_SIZE) ||
575 memcmp(table->oem_table_id, existing_table->oem_table_id,
576 ACPI_OEM_TABLE_ID_SIZE)) {
577 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
578 goto next_table;
579 }
580 /*
581 * Mark the table to avoid being used in
582 * acpi_table_initrd_scan() and check the revision.
583 */
584 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
585 existing_table->oem_revision >= table->oem_revision) {
586 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
587 goto next_table;
588 }
589
590 *length = table_length;
591 *address = acpi_tables_addr + table_offset;
592 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
593 table->signature, table->oem_id,
594 table->oem_table_id);
595 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
596 break;
597
598next_table:
599 table_offset += table_length;
600 table_index++;
601 }
602 return AE_OK;
603}
604
605static void __init acpi_table_initrd_scan(void)
606{
607 int table_offset = 0;
608 int table_index = 0;
609 u32 table_length;
610 struct acpi_table_header *table;
611
612 if (!acpi_tables_addr)
613 return;
614
615 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
616 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
617 ACPI_HEADER_SIZE);
618 if (table_offset + table->length > all_tables_size) {
619 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
620 WARN_ON(1);
621 return;
622 }
623
624 table_length = table->length;
625
626 /* Skip RSDT/XSDT which should only be used for override */
627 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
628 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
629 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
630 goto next_table;
631 }
632 /*
633 * Mark the table to avoid being used in
634 * acpi_table_initrd_override(). Though this is not possible
635 * because override is disabled in acpi_install_physical_table().
636 */
637 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
638 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
639 goto next_table;
640 }
641
642 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
643 table->signature, table->oem_id,
644 table->oem_table_id);
645 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
646 acpi_install_physical_table(acpi_tables_addr + table_offset);
647next_table:
648 table_offset += table_length;
649 table_index++;
650 }
651}
652#else
653static acpi_status
654acpi_table_initrd_override(struct acpi_table_header *existing_table,
655 acpi_physical_address *address,
656 u32 *table_length)
657{
658 *table_length = 0;
659 *address = 0;
660 return AE_OK;
661}
662
663static void __init acpi_table_initrd_scan(void)
664{
665}
666#endif /* CONFIG_ACPI_TABLE_UPGRADE */
667
668acpi_status
669acpi_os_physical_table_override(struct acpi_table_header *existing_table,
670 acpi_physical_address *address,
671 u32 *table_length)
672{
673 return acpi_table_initrd_override(existing_table, address,
674 table_length);
675}
676
677#ifdef CONFIG_ACPI_CUSTOM_DSDT
678static void *amlcode __attribute__ ((weakref("AmlCode")));
679static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
680#endif
681
682acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
683 struct acpi_table_header **new_table)
684{
685 if (!existing_table || !new_table)
686 return AE_BAD_PARAMETER;
687
688 *new_table = NULL;
689
690#ifdef CONFIG_ACPI_CUSTOM_DSDT
691 if (!strncmp(existing_table->signature, "DSDT", 4)) {
692 *new_table = (struct acpi_table_header *)&amlcode;
693 if (!(*new_table))
694 *new_table = (struct acpi_table_header *)&dsdt_amlcode;
695 }
696#endif
697 if (*new_table != NULL)
698 acpi_table_taint(existing_table);
699 return AE_OK;
700}
701
702/*
703 * acpi_locate_initial_tables()
704 *
705 * Get the RSDP, then find and checksum all the ACPI tables.
706 *
707 * result: initial_tables[] is initialized, and points to
708 * a list of ACPI tables.
709 */
710int __init acpi_locate_initial_tables(void)
711{
712 acpi_status status;
713
714 if (acpi_verify_table_checksum) {
715 pr_info("Early table checksum verification enabled\n");
716 acpi_gbl_enable_table_validation = TRUE;
717 } else {
718 pr_info("Early table checksum verification disabled\n");
719 acpi_gbl_enable_table_validation = FALSE;
720 }
721
722 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
723 if (ACPI_FAILURE(status)) {
724 const char *msg = acpi_format_exception(status);
725
726 pr_warn("Failed to initialize tables, status=0x%x (%s)", status, msg);
727 return -EINVAL;
728 }
729
730 return 0;
731}
732
733void __init acpi_reserve_initial_tables(void)
734{
735 int i;
736
737 for (i = 0; i < ACPI_MAX_TABLES; i++) {
738 struct acpi_table_desc *table_desc = &initial_tables[i];
739 u64 start = table_desc->address;
740 u64 size = table_desc->length;
741
742 if (!start || !size)
743 break;
744
745 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
746 table_desc->signature.ascii, start, start + size - 1);
747
748 memblock_reserve(start, size);
749 }
750}
751
752void __init acpi_table_init_complete(void)
753{
754 acpi_table_initrd_scan();
755 check_multiple_madt();
756}
757
758int __init acpi_table_init(void)
759{
760 int ret;
761
762 ret = acpi_locate_initial_tables();
763 if (ret)
764 return ret;
765
766 acpi_table_init_complete();
767
768 return 0;
769}
770
771static int __init acpi_parse_apic_instance(char *str)
772{
773 if (!str)
774 return -EINVAL;
775
776 if (kstrtoint(str, 0, &acpi_apic_instance))
777 return -EINVAL;
778
779 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
780
781 return 0;
782}
783early_param("acpi_apic_instance", acpi_parse_apic_instance);
784
785static int __init acpi_force_table_verification_setup(char *s)
786{
787 acpi_verify_table_checksum = true;
788
789 return 0;
790}
791early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
792
793static int __init acpi_force_32bit_fadt_addr(char *s)
794{
795 pr_info("Forcing 32 Bit FADT addresses\n");
796 acpi_gbl_use32_bit_fadt_addresses = TRUE;
797
798 return 0;
799}
800early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);