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 str_enabled_disabled(p->lapic_flags & ACPI_MADT_ENABLED));
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 str_enabled_disabled(p->lapic_flags & ACPI_MADT_ENABLED));
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 str_enabled_disabled(p->lapic_flags & ACPI_MADT_ENABLED));
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 str_enabled_disabled(p->flags & ACPI_MADT_ENABLED));
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 str_enabled_disabled(p->flags & ACPI_MADT_ENABLED));
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 str_enabled_disabled(p->flags & ACPI_MADT_ENABLED));
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(signature: id, instance, out_table: &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 table_header: (union fw_table_header *)table_header,
270 max_length: 0, proc, proc_num, max_entries);
271
272 acpi_put_table(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: &proc, proc_num: 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 table_size: sizeof(struct acpi_table_cedt), entry_id: id,
298 NULL, handler_arg, arg, max_entries: 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 table_size: sizeof(struct acpi_table_madt), entry_id: 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(signature: id, instance: acpi_apic_instance, out_table: &table);
341 else
342 acpi_get_table(signature: id, instance: 0, out_table: &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, instance: 2, out_table: &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] __nonstring_array __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, ACPI_SIG_SWFT};
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(path: cpio_path, data, len: size, offset: &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(buffer: file.data, length: 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(what: 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(size: all_tables_size, PAGE_SIZE,
496 start: 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(addr: acpi_tables_addr, size: all_tables_size);
512
513 kmemleak_ignore_phys(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(phys_addr: dest_addr & PAGE_MASK,
535 size: clen + slop);
536 memcpy(to: dest_p + slop, from: src_p, len: clen);
537 early_memunmap(addr: dest_p, size: 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(where: acpi_tables_addr + table_offset,
561 ACPI_HEADER_SIZE);
562 if (table_offset + table->length > all_tables_size) {
563 acpi_os_unmap_memory(logical_address: 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(logical_address: 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(nr: table_index, addr: acpi_initrd_installed) ||
584 existing_table->oem_revision >= table->oem_revision) {
585 acpi_os_unmap_memory(logical_address: 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(logical_address: 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(where: acpi_tables_addr + table_offset,
616 ACPI_HEADER_SIZE);
617 if (table_offset + table->length > all_tables_size) {
618 acpi_os_unmap_memory(logical_address: 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(logical_address: 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(nr: table_index, addr: acpi_initrd_installed)) {
637 acpi_os_unmap_memory(logical_address: 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(logical_address: table, ACPI_HEADER_SIZE);
645 acpi_install_physical_table(address: 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 length: 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(table: 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_storage: initial_tables, ACPI_MAX_TABLES, allow_resize: 0);
722 if (ACPI_FAILURE(status)) {
723 const char *msg = acpi_format_exception(exception: status);
724
725 pr_warn("Failed to initialize tables, status=0x%x (%s)", status, msg);
726 return -EINVAL;
727 }
728
729 return 0;
730}
731
732void __init acpi_reserve_initial_tables(void)
733{
734 int i;
735
736 for (i = 0; i < ACPI_MAX_TABLES; i++) {
737 struct acpi_table_desc *table_desc = &initial_tables[i];
738 u64 start = table_desc->address;
739 u64 size = table_desc->length;
740
741 if (!start || !size)
742 break;
743
744 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
745 table_desc->signature.ascii, start, start + size - 1);
746
747 memblock_reserve(base: start, size);
748 }
749}
750
751void __init acpi_table_init_complete(void)
752{
753 acpi_table_initrd_scan();
754 check_multiple_madt();
755}
756
757int __init acpi_table_init(void)
758{
759 int ret;
760
761 ret = acpi_locate_initial_tables();
762 if (ret)
763 return ret;
764
765 acpi_table_init_complete();
766
767 return 0;
768}
769
770static int __init acpi_parse_apic_instance(char *str)
771{
772 if (!str)
773 return -EINVAL;
774
775 if (kstrtoint(s: str, base: 0, res: &acpi_apic_instance))
776 return -EINVAL;
777
778 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
779
780 return 0;
781}
782early_param("acpi_apic_instance", acpi_parse_apic_instance);
783
784static int __init acpi_force_table_verification_setup(char *s)
785{
786 acpi_verify_table_checksum = true;
787
788 return 0;
789}
790early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
791
792static int __init acpi_force_32bit_fadt_addr(char *s)
793{
794 pr_info("Forcing 32 Bit FADT addresses\n");
795 acpi_gbl_use32_bit_fadt_addresses = TRUE;
796
797 return 0;
798}
799early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);
800