1 /*
2 * acpi_tables.c - ACPI Boot-Time Table Parsing
3 *
4 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19 *
20 */
21
22 /* Uncomment next line to get verbose printout */
23 /* #define DEBUG */
24 #define pr_fmt(fmt) "ACPI: " fmt
25
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/smp.h>
29 #include <linux/string.h>
30 #include <linux/types.h>
31 #include <linux/irq.h>
32 #include <linux/errno.h>
33 #include <linux/acpi.h>
34 #include <linux/bootmem.h>
35 #include <linux/earlycpio.h>
36 #include <linux/memblock.h>
37 #include <linux/initrd.h>
38 #include "internal.h"
39
40 #ifdef CONFIG_ACPI_CUSTOM_DSDT
41 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
42 #endif
43
44 #define ACPI_MAX_TABLES 128
45
46 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
47 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
48
49 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
50
51 static int acpi_apic_instance __initdata;
52
53 /*
54 * Disable table checksum verification for the early stage due to the size
55 * limitation of the current x86 early mapping implementation.
56 */
57 static bool acpi_verify_table_checksum __initdata = false;
58
acpi_table_print_madt_entry(struct acpi_subtable_header * header)59 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
60 {
61 if (!header)
62 return;
63
64 switch (header->type) {
65
66 case ACPI_MADT_TYPE_LOCAL_APIC:
67 {
68 struct acpi_madt_local_apic *p =
69 (struct acpi_madt_local_apic *)header;
70 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
71 p->processor_id, p->id,
72 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
73 }
74 break;
75
76 case ACPI_MADT_TYPE_LOCAL_X2APIC:
77 {
78 struct acpi_madt_local_x2apic *p =
79 (struct acpi_madt_local_x2apic *)header;
80 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
81 p->local_apic_id, p->uid,
82 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
83 }
84 break;
85
86 case ACPI_MADT_TYPE_IO_APIC:
87 {
88 struct acpi_madt_io_apic *p =
89 (struct acpi_madt_io_apic *)header;
90 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
91 p->id, p->address, p->global_irq_base);
92 }
93 break;
94
95 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
96 {
97 struct acpi_madt_interrupt_override *p =
98 (struct acpi_madt_interrupt_override *)header;
99 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
100 p->bus, p->source_irq, p->global_irq,
101 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
102 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
103 if (p->inti_flags &
104 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
105 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
106 p->inti_flags &
107 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
108 }
109 break;
110
111 case ACPI_MADT_TYPE_NMI_SOURCE:
112 {
113 struct acpi_madt_nmi_source *p =
114 (struct acpi_madt_nmi_source *)header;
115 pr_info("NMI_SRC (%s %s global_irq %d)\n",
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->global_irq);
119 }
120 break;
121
122 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
123 {
124 struct acpi_madt_local_apic_nmi *p =
125 (struct acpi_madt_local_apic_nmi *)header;
126 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
127 p->processor_id,
128 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
129 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
130 p->lint);
131 }
132 break;
133
134 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
135 {
136 u16 polarity, trigger;
137 struct acpi_madt_local_x2apic_nmi *p =
138 (struct acpi_madt_local_x2apic_nmi *)header;
139
140 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
141 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
142
143 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
144 p->uid,
145 mps_inti_flags_polarity[polarity],
146 mps_inti_flags_trigger[trigger],
147 p->lint);
148 }
149 break;
150
151 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
152 {
153 struct acpi_madt_local_apic_override *p =
154 (struct acpi_madt_local_apic_override *)header;
155 pr_info("LAPIC_ADDR_OVR (address[%p])\n",
156 (void *)(unsigned long)p->address);
157 }
158 break;
159
160 case ACPI_MADT_TYPE_IO_SAPIC:
161 {
162 struct acpi_madt_io_sapic *p =
163 (struct acpi_madt_io_sapic *)header;
164 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
165 p->id, (void *)(unsigned long)p->address,
166 p->global_irq_base);
167 }
168 break;
169
170 case ACPI_MADT_TYPE_LOCAL_SAPIC:
171 {
172 struct acpi_madt_local_sapic *p =
173 (struct acpi_madt_local_sapic *)header;
174 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
175 p->processor_id, p->id, p->eid,
176 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
177 }
178 break;
179
180 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
181 {
182 struct acpi_madt_interrupt_source *p =
183 (struct acpi_madt_interrupt_source *)header;
184 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",
185 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
186 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
187 p->type, p->id, p->eid, p->io_sapic_vector,
188 p->global_irq);
189 }
190 break;
191
192 case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
193 {
194 struct acpi_madt_generic_interrupt *p =
195 (struct acpi_madt_generic_interrupt *)header;
196 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
197 p->uid, p->base_address,
198 p->arm_mpidr,
199 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
200
201 }
202 break;
203
204 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
205 {
206 struct acpi_madt_generic_distributor *p =
207 (struct acpi_madt_generic_distributor *)header;
208 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
209 p->gic_id, p->base_address,
210 p->global_irq_base);
211 }
212 break;
213
214 default:
215 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
216 header->type);
217 break;
218 }
219 }
220
221 /**
222 * acpi_parse_entries_array - for each proc_num find a suitable subtable
223 *
224 * @id: table id (for debugging purposes)
225 * @table_size: size of the root table
226 * @table_header: where does the table start?
227 * @proc: array of acpi_subtable_proc struct containing entry id
228 * and associated handler with it
229 * @proc_num: how big proc is?
230 * @max_entries: how many entries can we process?
231 *
232 * For each proc_num find a subtable with proc->id and run proc->handler
233 * on it. Assumption is that there's only single handler for particular
234 * entry id.
235 *
236 * The table_size is not the size of the complete ACPI table (the length
237 * field in the header struct), but only the size of the root table; i.e.,
238 * the offset from the very first byte of the complete ACPI table, to the
239 * first byte of the very first subtable.
240 *
241 * On success returns sum of all matching entries for all proc handlers.
242 * Otherwise, -ENODEV or -EINVAL is returned.
243 */
244 static int __init
acpi_parse_entries_array(char * id,unsigned long table_size,struct acpi_table_header * table_header,struct acpi_subtable_proc * proc,int proc_num,unsigned int max_entries)245 acpi_parse_entries_array(char *id, unsigned long table_size,
246 struct acpi_table_header *table_header,
247 struct acpi_subtable_proc *proc, int proc_num,
248 unsigned int max_entries)
249 {
250 struct acpi_subtable_header *entry;
251 unsigned long table_end;
252 int count = 0;
253 int errs = 0;
254 int i;
255
256 if (acpi_disabled)
257 return -ENODEV;
258
259 if (!id)
260 return -EINVAL;
261
262 if (!table_size)
263 return -EINVAL;
264
265 if (!table_header) {
266 pr_warn("%4.4s not present\n", id);
267 return -ENODEV;
268 }
269
270 table_end = (unsigned long)table_header + table_header->length;
271
272 /* Parse all entries looking for a match. */
273
274 entry = (struct acpi_subtable_header *)
275 ((unsigned long)table_header + table_size);
276
277 while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
278 table_end) {
279 if (max_entries && count >= max_entries)
280 break;
281
282 for (i = 0; i < proc_num; i++) {
283 if (entry->type != proc[i].id)
284 continue;
285 if (!proc[i].handler ||
286 (!errs && proc[i].handler(entry, table_end))) {
287 errs++;
288 continue;
289 }
290
291 proc[i].count++;
292 break;
293 }
294 if (i != proc_num)
295 count++;
296
297 /*
298 * If entry->length is 0, break from this loop to avoid
299 * infinite loop.
300 */
301 if (entry->length == 0) {
302 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
303 return -EINVAL;
304 }
305
306 entry = (struct acpi_subtable_header *)
307 ((unsigned long)entry + entry->length);
308 }
309
310 if (max_entries && count > max_entries) {
311 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
312 id, proc->id, count);
313 }
314
315 return errs ? -EINVAL : count;
316 }
317
318 int __init
acpi_table_parse_entries_array(char * id,unsigned long table_size,struct acpi_subtable_proc * proc,int proc_num,unsigned int max_entries)319 acpi_table_parse_entries_array(char *id,
320 unsigned long table_size,
321 struct acpi_subtable_proc *proc, int proc_num,
322 unsigned int max_entries)
323 {
324 struct acpi_table_header *table_header = NULL;
325 int count;
326 u32 instance = 0;
327
328 if (acpi_disabled)
329 return -ENODEV;
330
331 if (!id)
332 return -EINVAL;
333
334 if (!strncmp(id, ACPI_SIG_MADT, 4))
335 instance = acpi_apic_instance;
336
337 acpi_get_table(id, instance, &table_header);
338 if (!table_header) {
339 pr_warn("%4.4s not present\n", id);
340 return -ENODEV;
341 }
342
343 count = acpi_parse_entries_array(id, table_size, table_header,
344 proc, proc_num, max_entries);
345
346 acpi_put_table(table_header);
347 return count;
348 }
349
350 int __init
acpi_table_parse_entries(char * id,unsigned long table_size,int entry_id,acpi_tbl_entry_handler handler,unsigned int max_entries)351 acpi_table_parse_entries(char *id,
352 unsigned long table_size,
353 int entry_id,
354 acpi_tbl_entry_handler handler,
355 unsigned int max_entries)
356 {
357 struct acpi_subtable_proc proc = {
358 .id = entry_id,
359 .handler = handler,
360 };
361
362 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
363 max_entries);
364 }
365
366 int __init
acpi_table_parse_madt(enum acpi_madt_type id,acpi_tbl_entry_handler handler,unsigned int max_entries)367 acpi_table_parse_madt(enum acpi_madt_type id,
368 acpi_tbl_entry_handler handler, unsigned int max_entries)
369 {
370 return acpi_table_parse_entries(ACPI_SIG_MADT,
371 sizeof(struct acpi_table_madt), id,
372 handler, max_entries);
373 }
374
375 /**
376 * acpi_table_parse - find table with @id, run @handler on it
377 * @id: table id to find
378 * @handler: handler to run
379 *
380 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
381 * run @handler on it.
382 *
383 * Return 0 if table found, -errno if not.
384 */
acpi_table_parse(char * id,acpi_tbl_table_handler handler)385 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
386 {
387 struct acpi_table_header *table = NULL;
388
389 if (acpi_disabled)
390 return -ENODEV;
391
392 if (!id || !handler)
393 return -EINVAL;
394
395 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
396 acpi_get_table(id, acpi_apic_instance, &table);
397 else
398 acpi_get_table(id, 0, &table);
399
400 if (table) {
401 handler(table);
402 acpi_put_table(table);
403 return 0;
404 } else
405 return -ENODEV;
406 }
407
408 /*
409 * The BIOS is supposed to supply a single APIC/MADT,
410 * but some report two. Provide a knob to use either.
411 * (don't you wish instance 0 and 1 were not the same?)
412 */
check_multiple_madt(void)413 static void __init check_multiple_madt(void)
414 {
415 struct acpi_table_header *table = NULL;
416
417 acpi_get_table(ACPI_SIG_MADT, 2, &table);
418 if (table) {
419 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
420 acpi_apic_instance);
421 pr_warn("If \"acpi_apic_instance=%d\" works better, "
422 "notify linux-acpi@vger.kernel.org\n",
423 acpi_apic_instance ? 0 : 2);
424 acpi_put_table(table);
425
426 } else
427 acpi_apic_instance = 0;
428
429 return;
430 }
431
acpi_table_taint(struct acpi_table_header * table)432 static void acpi_table_taint(struct acpi_table_header *table)
433 {
434 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
435 table->signature, table->oem_table_id);
436 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
437 }
438
439 #ifdef CONFIG_ACPI_TABLE_UPGRADE
440 static u64 acpi_tables_addr;
441 static int all_tables_size;
442
443 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
acpi_table_checksum(u8 * buffer,u32 length)444 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
445 {
446 u8 sum = 0;
447 u8 *end = buffer + length;
448
449 while (buffer < end)
450 sum = (u8) (sum + *(buffer++));
451 return sum;
452 }
453
454 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
455 static const char * const table_sigs[] = {
456 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
457 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
458 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
459 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
460 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
461 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
462 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
463 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
464 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, ACPI_SIG_IORT,
465 ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, NULL };
466
467 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
468
469 #define NR_ACPI_INITRD_TABLES 64
470 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
471 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
472
473 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
474
acpi_table_upgrade(void)475 void __init acpi_table_upgrade(void)
476 {
477 void *data = (void *)initrd_start;
478 size_t size = initrd_end - initrd_start;
479 int sig, no, table_nr = 0, total_offset = 0;
480 long offset = 0;
481 struct acpi_table_header *table;
482 char cpio_path[32] = "kernel/firmware/acpi/";
483 struct cpio_data file;
484
485 if (data == NULL || size == 0)
486 return;
487
488 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
489 file = find_cpio_data(cpio_path, data, size, &offset);
490 if (!file.data)
491 break;
492
493 data += offset;
494 size -= offset;
495
496 if (file.size < sizeof(struct acpi_table_header)) {
497 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
498 cpio_path, file.name);
499 continue;
500 }
501
502 table = file.data;
503
504 for (sig = 0; table_sigs[sig]; sig++)
505 if (!memcmp(table->signature, table_sigs[sig], 4))
506 break;
507
508 if (!table_sigs[sig]) {
509 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
510 cpio_path, file.name);
511 continue;
512 }
513 if (file.size != table->length) {
514 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
515 cpio_path, file.name);
516 continue;
517 }
518 if (acpi_table_checksum(file.data, table->length)) {
519 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
520 cpio_path, file.name);
521 continue;
522 }
523
524 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
525 table->signature, cpio_path, file.name, table->length);
526
527 all_tables_size += table->length;
528 acpi_initrd_files[table_nr].data = file.data;
529 acpi_initrd_files[table_nr].size = file.size;
530 table_nr++;
531 }
532 if (table_nr == 0)
533 return;
534
535 acpi_tables_addr =
536 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS,
537 all_tables_size, PAGE_SIZE);
538 if (!acpi_tables_addr) {
539 WARN_ON(1);
540 return;
541 }
542 /*
543 * Only calling e820_add_reserve does not work and the
544 * tables are invalid (memory got used) later.
545 * memblock_reserve works as expected and the tables won't get modified.
546 * But it's not enough on X86 because ioremap will
547 * complain later (used by acpi_os_map_memory) that the pages
548 * that should get mapped are not marked "reserved".
549 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
550 * works fine.
551 */
552 memblock_reserve(acpi_tables_addr, all_tables_size);
553 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
554
555 /*
556 * early_ioremap only can remap 256k one time. If we map all
557 * tables one time, we will hit the limit. Need to map chunks
558 * one by one during copying the same as that in relocate_initrd().
559 */
560 for (no = 0; no < table_nr; no++) {
561 unsigned char *src_p = acpi_initrd_files[no].data;
562 phys_addr_t size = acpi_initrd_files[no].size;
563 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
564 phys_addr_t slop, clen;
565 char *dest_p;
566
567 total_offset += size;
568
569 while (size) {
570 slop = dest_addr & ~PAGE_MASK;
571 clen = size;
572 if (clen > MAP_CHUNK_SIZE - slop)
573 clen = MAP_CHUNK_SIZE - slop;
574 dest_p = early_memremap(dest_addr & PAGE_MASK,
575 clen + slop);
576 memcpy(dest_p + slop, src_p, clen);
577 early_memunmap(dest_p, clen + slop);
578 src_p += clen;
579 dest_addr += clen;
580 size -= clen;
581 }
582 }
583 }
584
585 static acpi_status
acpi_table_initrd_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * length)586 acpi_table_initrd_override(struct acpi_table_header *existing_table,
587 acpi_physical_address *address, u32 *length)
588 {
589 int table_offset = 0;
590 int table_index = 0;
591 struct acpi_table_header *table;
592 u32 table_length;
593
594 *length = 0;
595 *address = 0;
596 if (!acpi_tables_addr)
597 return AE_OK;
598
599 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
600 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
601 ACPI_HEADER_SIZE);
602 if (table_offset + table->length > all_tables_size) {
603 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
604 WARN_ON(1);
605 return AE_OK;
606 }
607
608 table_length = table->length;
609
610 /* Only override tables matched */
611 if (memcmp(existing_table->signature, table->signature, 4) ||
612 memcmp(table->oem_id, existing_table->oem_id,
613 ACPI_OEM_ID_SIZE) ||
614 memcmp(table->oem_table_id, existing_table->oem_table_id,
615 ACPI_OEM_TABLE_ID_SIZE)) {
616 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
617 goto next_table;
618 }
619 /*
620 * Mark the table to avoid being used in
621 * acpi_table_initrd_scan() and check the revision.
622 */
623 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
624 existing_table->oem_revision >= table->oem_revision) {
625 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
626 goto next_table;
627 }
628
629 *length = table_length;
630 *address = acpi_tables_addr + table_offset;
631 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
632 table->signature, table->oem_id,
633 table->oem_table_id);
634 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
635 break;
636
637 next_table:
638 table_offset += table_length;
639 table_index++;
640 }
641 return AE_OK;
642 }
643
acpi_table_initrd_scan(void)644 static void __init acpi_table_initrd_scan(void)
645 {
646 int table_offset = 0;
647 int table_index = 0;
648 u32 table_length;
649 struct acpi_table_header *table;
650
651 if (!acpi_tables_addr)
652 return;
653
654 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
655 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
656 ACPI_HEADER_SIZE);
657 if (table_offset + table->length > all_tables_size) {
658 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
659 WARN_ON(1);
660 return;
661 }
662
663 table_length = table->length;
664
665 /* Skip RSDT/XSDT which should only be used for override */
666 if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) ||
667 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) {
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_override(). Though this is not possible
674 * because override is disabled in acpi_install_table().
675 */
676 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
677 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
678 goto next_table;
679 }
680
681 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
682 table->signature, table->oem_id,
683 table->oem_table_id);
684 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
685 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
686 next_table:
687 table_offset += table_length;
688 table_index++;
689 }
690 }
691 #else
692 static acpi_status
acpi_table_initrd_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)693 acpi_table_initrd_override(struct acpi_table_header *existing_table,
694 acpi_physical_address *address,
695 u32 *table_length)
696 {
697 *table_length = 0;
698 *address = 0;
699 return AE_OK;
700 }
701
acpi_table_initrd_scan(void)702 static void __init acpi_table_initrd_scan(void)
703 {
704 }
705 #endif /* CONFIG_ACPI_TABLE_UPGRADE */
706
707 acpi_status
acpi_os_physical_table_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)708 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
709 acpi_physical_address *address,
710 u32 *table_length)
711 {
712 return acpi_table_initrd_override(existing_table, address,
713 table_length);
714 }
715
716 acpi_status
acpi_os_table_override(struct acpi_table_header * existing_table,struct acpi_table_header ** new_table)717 acpi_os_table_override(struct acpi_table_header *existing_table,
718 struct acpi_table_header **new_table)
719 {
720 if (!existing_table || !new_table)
721 return AE_BAD_PARAMETER;
722
723 *new_table = NULL;
724
725 #ifdef CONFIG_ACPI_CUSTOM_DSDT
726 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
727 *new_table = (struct acpi_table_header *)AmlCode;
728 #endif
729 if (*new_table != NULL)
730 acpi_table_taint(existing_table);
731 return AE_OK;
732 }
733
734 /*
735 * acpi_table_init()
736 *
737 * find RSDP, find and checksum SDT/XSDT.
738 * checksum all tables, print SDT/XSDT
739 *
740 * result: sdt_entry[] is initialized
741 */
742
acpi_table_init(void)743 int __init acpi_table_init(void)
744 {
745 acpi_status status;
746
747 if (acpi_verify_table_checksum) {
748 pr_info("Early table checksum verification enabled\n");
749 acpi_gbl_enable_table_validation = TRUE;
750 } else {
751 pr_info("Early table checksum verification disabled\n");
752 acpi_gbl_enable_table_validation = FALSE;
753 }
754
755 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
756 if (ACPI_FAILURE(status))
757 return -EINVAL;
758 acpi_table_initrd_scan();
759
760 check_multiple_madt();
761 return 0;
762 }
763
acpi_parse_apic_instance(char * str)764 static int __init acpi_parse_apic_instance(char *str)
765 {
766 if (!str)
767 return -EINVAL;
768
769 if (kstrtoint(str, 0, &acpi_apic_instance))
770 return -EINVAL;
771
772 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
773
774 return 0;
775 }
776
777 early_param("acpi_apic_instance", acpi_parse_apic_instance);
778
acpi_force_table_verification_setup(char * s)779 static int __init acpi_force_table_verification_setup(char *s)
780 {
781 acpi_verify_table_checksum = true;
782
783 return 0;
784 }
785
786 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
787
acpi_force_32bit_fadt_addr(char * s)788 static 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 }
795
796 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);
797
