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