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
33 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
34 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
35
36 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
37
38 static int acpi_apic_instance __initdata;
39
40 enum acpi_subtable_type {
41 ACPI_SUBTABLE_COMMON,
42 ACPI_SUBTABLE_HMAT,
43 ACPI_SUBTABLE_PRMT,
44 };
45
46 struct acpi_subtable_entry {
47 union acpi_subtable_headers *hdr;
48 enum acpi_subtable_type type;
49 };
50
51 /*
52 * Disable table checksum verification for the early stage due to the size
53 * limitation of the current x86 early mapping implementation.
54 */
55 static bool acpi_verify_table_checksum __initdata = false;
56
acpi_table_print_madt_entry(struct acpi_subtable_header * header)57 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
58 {
59 if (!header)
60 return;
61
62 switch (header->type) {
63
64 case ACPI_MADT_TYPE_LOCAL_APIC:
65 {
66 struct acpi_madt_local_apic *p =
67 (struct acpi_madt_local_apic *)header;
68 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
69 p->processor_id, p->id,
70 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
71 }
72 break;
73
74 case ACPI_MADT_TYPE_LOCAL_X2APIC:
75 {
76 struct acpi_madt_local_x2apic *p =
77 (struct acpi_madt_local_x2apic *)header;
78 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
79 p->local_apic_id, p->uid,
80 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
81 }
82 break;
83
84 case ACPI_MADT_TYPE_IO_APIC:
85 {
86 struct acpi_madt_io_apic *p =
87 (struct acpi_madt_io_apic *)header;
88 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
89 p->id, p->address, p->global_irq_base);
90 }
91 break;
92
93 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
94 {
95 struct acpi_madt_interrupt_override *p =
96 (struct acpi_madt_interrupt_override *)header;
97 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
98 p->bus, p->source_irq, p->global_irq,
99 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
100 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
101 if (p->inti_flags &
102 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
103 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
104 p->inti_flags &
105 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
106 }
107 break;
108
109 case ACPI_MADT_TYPE_NMI_SOURCE:
110 {
111 struct acpi_madt_nmi_source *p =
112 (struct acpi_madt_nmi_source *)header;
113 pr_info("NMI_SRC (%s %s global_irq %d)\n",
114 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
115 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
116 p->global_irq);
117 }
118 break;
119
120 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
121 {
122 struct acpi_madt_local_apic_nmi *p =
123 (struct acpi_madt_local_apic_nmi *)header;
124 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
125 p->processor_id,
126 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
127 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
128 p->lint);
129 }
130 break;
131
132 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
133 {
134 u16 polarity, trigger;
135 struct acpi_madt_local_x2apic_nmi *p =
136 (struct acpi_madt_local_x2apic_nmi *)header;
137
138 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
139 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
140
141 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
142 p->uid,
143 mps_inti_flags_polarity[polarity],
144 mps_inti_flags_trigger[trigger],
145 p->lint);
146 }
147 break;
148
149 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
150 {
151 struct acpi_madt_local_apic_override *p =
152 (struct acpi_madt_local_apic_override *)header;
153 pr_info("LAPIC_ADDR_OVR (address[%p])\n",
154 (void *)(unsigned long)p->address);
155 }
156 break;
157
158 case ACPI_MADT_TYPE_IO_SAPIC:
159 {
160 struct acpi_madt_io_sapic *p =
161 (struct acpi_madt_io_sapic *)header;
162 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
163 p->id, (void *)(unsigned long)p->address,
164 p->global_irq_base);
165 }
166 break;
167
168 case ACPI_MADT_TYPE_LOCAL_SAPIC:
169 {
170 struct acpi_madt_local_sapic *p =
171 (struct acpi_madt_local_sapic *)header;
172 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
173 p->processor_id, p->id, p->eid,
174 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
175 }
176 break;
177
178 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
179 {
180 struct acpi_madt_interrupt_source *p =
181 (struct acpi_madt_interrupt_source *)header;
182 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",
183 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
184 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
185 p->type, p->id, p->eid, p->io_sapic_vector,
186 p->global_irq);
187 }
188 break;
189
190 case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
191 {
192 struct acpi_madt_generic_interrupt *p =
193 (struct acpi_madt_generic_interrupt *)header;
194 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
195 p->uid, p->base_address,
196 p->arm_mpidr,
197 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
198
199 }
200 break;
201
202 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
203 {
204 struct acpi_madt_generic_distributor *p =
205 (struct acpi_madt_generic_distributor *)header;
206 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
207 p->gic_id, p->base_address,
208 p->global_irq_base);
209 }
210 break;
211
212 default:
213 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
214 header->type);
215 break;
216 }
217 }
218
219 static unsigned long __init
acpi_get_entry_type(struct acpi_subtable_entry * entry)220 acpi_get_entry_type(struct acpi_subtable_entry *entry)
221 {
222 switch (entry->type) {
223 case ACPI_SUBTABLE_COMMON:
224 return entry->hdr->common.type;
225 case ACPI_SUBTABLE_HMAT:
226 return entry->hdr->hmat.type;
227 case ACPI_SUBTABLE_PRMT:
228 return 0;
229 }
230 return 0;
231 }
232
233 static unsigned long __init
acpi_get_entry_length(struct acpi_subtable_entry * entry)234 acpi_get_entry_length(struct acpi_subtable_entry *entry)
235 {
236 switch (entry->type) {
237 case ACPI_SUBTABLE_COMMON:
238 return entry->hdr->common.length;
239 case ACPI_SUBTABLE_HMAT:
240 return entry->hdr->hmat.length;
241 case ACPI_SUBTABLE_PRMT:
242 return entry->hdr->prmt.length;
243 }
244 return 0;
245 }
246
247 static unsigned long __init
acpi_get_subtable_header_length(struct acpi_subtable_entry * entry)248 acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
249 {
250 switch (entry->type) {
251 case ACPI_SUBTABLE_COMMON:
252 return sizeof(entry->hdr->common);
253 case ACPI_SUBTABLE_HMAT:
254 return sizeof(entry->hdr->hmat);
255 case ACPI_SUBTABLE_PRMT:
256 return sizeof(entry->hdr->prmt);
257 }
258 return 0;
259 }
260
261 static enum acpi_subtable_type __init
acpi_get_subtable_type(char * id)262 acpi_get_subtable_type(char *id)
263 {
264 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
265 return ACPI_SUBTABLE_HMAT;
266 if (strncmp(id, ACPI_SIG_PRMT, 4) == 0)
267 return ACPI_SUBTABLE_PRMT;
268 return ACPI_SUBTABLE_COMMON;
269 }
270
271 /**
272 * acpi_parse_entries_array - for each proc_num find a suitable subtable
273 *
274 * @id: table id (for debugging purposes)
275 * @table_size: size of the root table
276 * @table_header: where does the table start?
277 * @proc: array of acpi_subtable_proc struct containing entry id
278 * and associated handler with it
279 * @proc_num: how big proc is?
280 * @max_entries: how many entries can we process?
281 *
282 * For each proc_num find a subtable with proc->id and run proc->handler
283 * on it. Assumption is that there's only single handler for particular
284 * entry id.
285 *
286 * The table_size is not the size of the complete ACPI table (the length
287 * field in the header struct), but only the size of the root table; i.e.,
288 * the offset from the very first byte of the complete ACPI table, to the
289 * first byte of the very first subtable.
290 *
291 * On success returns sum of all matching entries for all proc handlers.
292 * Otherwise, -ENODEV or -EINVAL is returned.
293 */
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)294 static int __init acpi_parse_entries_array(char *id, unsigned long table_size,
295 struct acpi_table_header *table_header,
296 struct acpi_subtable_proc *proc, int proc_num,
297 unsigned int max_entries)
298 {
299 struct acpi_subtable_entry entry;
300 unsigned long table_end, subtable_len, entry_len;
301 int count = 0;
302 int errs = 0;
303 int i;
304
305 table_end = (unsigned long)table_header + table_header->length;
306
307 /* Parse all entries looking for a match. */
308
309 entry.type = acpi_get_subtable_type(id);
310 entry.hdr = (union acpi_subtable_headers *)
311 ((unsigned long)table_header + table_size);
312 subtable_len = acpi_get_subtable_header_length(&entry);
313
314 while (((unsigned long)entry.hdr) + subtable_len < table_end) {
315 if (max_entries && count >= max_entries)
316 break;
317
318 for (i = 0; i < proc_num; i++) {
319 if (acpi_get_entry_type(&entry) != proc[i].id)
320 continue;
321 if (!proc[i].handler ||
322 (!errs && proc[i].handler(entry.hdr, table_end))) {
323 errs++;
324 continue;
325 }
326
327 proc[i].count++;
328 break;
329 }
330 if (i != proc_num)
331 count++;
332
333 /*
334 * If entry->length is 0, break from this loop to avoid
335 * infinite loop.
336 */
337 entry_len = acpi_get_entry_length(&entry);
338 if (entry_len == 0) {
339 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
340 return -EINVAL;
341 }
342
343 entry.hdr = (union acpi_subtable_headers *)
344 ((unsigned long)entry.hdr + entry_len);
345 }
346
347 if (max_entries && count > max_entries) {
348 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
349 id, proc->id, count);
350 }
351
352 return errs ? -EINVAL : count;
353 }
354
acpi_table_parse_entries_array(char * id,unsigned long table_size,struct acpi_subtable_proc * proc,int proc_num,unsigned int max_entries)355 int __init acpi_table_parse_entries_array(char *id,
356 unsigned long table_size,
357 struct acpi_subtable_proc *proc, int proc_num,
358 unsigned int max_entries)
359 {
360 struct acpi_table_header *table_header = NULL;
361 int count;
362 u32 instance = 0;
363
364 if (acpi_disabled)
365 return -ENODEV;
366
367 if (!id)
368 return -EINVAL;
369
370 if (!table_size)
371 return -EINVAL;
372
373 if (!strncmp(id, ACPI_SIG_MADT, 4))
374 instance = acpi_apic_instance;
375
376 acpi_get_table(id, instance, &table_header);
377 if (!table_header) {
378 pr_warn("%4.4s not present\n", id);
379 return -ENODEV;
380 }
381
382 count = acpi_parse_entries_array(id, table_size, table_header,
383 proc, proc_num, max_entries);
384
385 acpi_put_table(table_header);
386 return count;
387 }
388
acpi_table_parse_entries(char * id,unsigned long table_size,int entry_id,acpi_tbl_entry_handler handler,unsigned int max_entries)389 int __init acpi_table_parse_entries(char *id,
390 unsigned long table_size,
391 int entry_id,
392 acpi_tbl_entry_handler handler,
393 unsigned int max_entries)
394 {
395 struct acpi_subtable_proc proc = {
396 .id = entry_id,
397 .handler = handler,
398 };
399
400 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
401 max_entries);
402 }
403
acpi_table_parse_madt(enum acpi_madt_type id,acpi_tbl_entry_handler handler,unsigned int max_entries)404 int __init acpi_table_parse_madt(enum acpi_madt_type id,
405 acpi_tbl_entry_handler handler, unsigned int max_entries)
406 {
407 return acpi_table_parse_entries(ACPI_SIG_MADT,
408 sizeof(struct acpi_table_madt), id,
409 handler, max_entries);
410 }
411
412 /**
413 * acpi_table_parse - find table with @id, run @handler on it
414 * @id: table id to find
415 * @handler: handler to run
416 *
417 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
418 * run @handler on it.
419 *
420 * Return 0 if table found, -errno if not.
421 */
acpi_table_parse(char * id,acpi_tbl_table_handler handler)422 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
423 {
424 struct acpi_table_header *table = NULL;
425
426 if (acpi_disabled)
427 return -ENODEV;
428
429 if (!id || !handler)
430 return -EINVAL;
431
432 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
433 acpi_get_table(id, acpi_apic_instance, &table);
434 else
435 acpi_get_table(id, 0, &table);
436
437 if (table) {
438 handler(table);
439 acpi_put_table(table);
440 return 0;
441 } else
442 return -ENODEV;
443 }
444
445 /*
446 * The BIOS is supposed to supply a single APIC/MADT,
447 * but some report two. Provide a knob to use either.
448 * (don't you wish instance 0 and 1 were not the same?)
449 */
check_multiple_madt(void)450 static void __init check_multiple_madt(void)
451 {
452 struct acpi_table_header *table = NULL;
453
454 acpi_get_table(ACPI_SIG_MADT, 2, &table);
455 if (table) {
456 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
457 acpi_apic_instance);
458 pr_warn("If \"acpi_apic_instance=%d\" works better, "
459 "notify linux-acpi@vger.kernel.org\n",
460 acpi_apic_instance ? 0 : 2);
461 acpi_put_table(table);
462
463 } else
464 acpi_apic_instance = 0;
465
466 return;
467 }
468
acpi_table_taint(struct acpi_table_header * table)469 static void acpi_table_taint(struct acpi_table_header *table)
470 {
471 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
472 table->signature, table->oem_table_id);
473 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
474 }
475
476 #ifdef CONFIG_ACPI_TABLE_UPGRADE
477 static u64 acpi_tables_addr;
478 static int all_tables_size;
479
480 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
acpi_table_checksum(u8 * buffer,u32 length)481 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
482 {
483 u8 sum = 0;
484 u8 *end = buffer + length;
485
486 while (buffer < end)
487 sum = (u8) (sum + *(buffer++));
488 return sum;
489 }
490
491 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
492 static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
493 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
494 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
495 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
496 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
497 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
498 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
499 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
500 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
501 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
502 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
503 ACPI_SIG_NHLT };
504
505 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
506
507 #define NR_ACPI_INITRD_TABLES 64
508 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
509 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
510
511 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
512
acpi_table_upgrade(void)513 void __init acpi_table_upgrade(void)
514 {
515 void *data;
516 size_t size;
517 int sig, no, table_nr = 0, total_offset = 0;
518 long offset = 0;
519 struct acpi_table_header *table;
520 char cpio_path[32] = "kernel/firmware/acpi/";
521 struct cpio_data file;
522
523 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
524 data = __initramfs_start;
525 size = __initramfs_size;
526 } else {
527 data = (void *)initrd_start;
528 size = initrd_end - initrd_start;
529 }
530
531 if (data == NULL || size == 0)
532 return;
533
534 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
535 file = find_cpio_data(cpio_path, data, size, &offset);
536 if (!file.data)
537 break;
538
539 data += offset;
540 size -= offset;
541
542 if (file.size < sizeof(struct acpi_table_header)) {
543 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
544 cpio_path, file.name);
545 continue;
546 }
547
548 table = file.data;
549
550 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
551 if (!memcmp(table->signature, table_sigs[sig], 4))
552 break;
553
554 if (sig >= ARRAY_SIZE(table_sigs)) {
555 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
556 cpio_path, file.name);
557 continue;
558 }
559 if (file.size != table->length) {
560 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
561 cpio_path, file.name);
562 continue;
563 }
564 if (acpi_table_checksum(file.data, table->length)) {
565 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
566 cpio_path, file.name);
567 continue;
568 }
569
570 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
571 table->signature, cpio_path, file.name, table->length);
572
573 all_tables_size += table->length;
574 acpi_initrd_files[table_nr].data = file.data;
575 acpi_initrd_files[table_nr].size = file.size;
576 table_nr++;
577 }
578 if (table_nr == 0)
579 return;
580
581 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
582 pr_notice("kernel is locked down, ignoring table override\n");
583 return;
584 }
585
586 acpi_tables_addr =
587 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE,
588 0, ACPI_TABLE_UPGRADE_MAX_PHYS);
589 if (!acpi_tables_addr) {
590 WARN_ON(1);
591 return;
592 }
593 /*
594 * Only calling e820_add_reserve does not work and the
595 * tables are invalid (memory got used) later.
596 * memblock_reserve works as expected and the tables won't get modified.
597 * But it's not enough on X86 because ioremap will
598 * complain later (used by acpi_os_map_memory) that the pages
599 * that should get mapped are not marked "reserved".
600 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
601 * works fine.
602 */
603 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
604
605 kmemleak_ignore_phys(acpi_tables_addr);
606
607 /*
608 * early_ioremap only can remap 256k one time. If we map all
609 * tables one time, we will hit the limit. Need to map chunks
610 * one by one during copying the same as that in relocate_initrd().
611 */
612 for (no = 0; no < table_nr; no++) {
613 unsigned char *src_p = acpi_initrd_files[no].data;
614 phys_addr_t size = acpi_initrd_files[no].size;
615 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
616 phys_addr_t slop, clen;
617 char *dest_p;
618
619 total_offset += size;
620
621 while (size) {
622 slop = dest_addr & ~PAGE_MASK;
623 clen = size;
624 if (clen > MAP_CHUNK_SIZE - slop)
625 clen = MAP_CHUNK_SIZE - slop;
626 dest_p = early_memremap(dest_addr & PAGE_MASK,
627 clen + slop);
628 memcpy(dest_p + slop, src_p, clen);
629 early_memunmap(dest_p, clen + slop);
630 src_p += clen;
631 dest_addr += clen;
632 size -= clen;
633 }
634 }
635 }
636
637 static acpi_status
acpi_table_initrd_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * length)638 acpi_table_initrd_override(struct acpi_table_header *existing_table,
639 acpi_physical_address *address, u32 *length)
640 {
641 int table_offset = 0;
642 int table_index = 0;
643 struct acpi_table_header *table;
644 u32 table_length;
645
646 *length = 0;
647 *address = 0;
648 if (!acpi_tables_addr)
649 return AE_OK;
650
651 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
652 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
653 ACPI_HEADER_SIZE);
654 if (table_offset + table->length > all_tables_size) {
655 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
656 WARN_ON(1);
657 return AE_OK;
658 }
659
660 table_length = table->length;
661
662 /* Only override tables matched */
663 if (memcmp(existing_table->signature, table->signature, 4) ||
664 memcmp(table->oem_id, existing_table->oem_id,
665 ACPI_OEM_ID_SIZE) ||
666 memcmp(table->oem_table_id, existing_table->oem_table_id,
667 ACPI_OEM_TABLE_ID_SIZE)) {
668 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
669 goto next_table;
670 }
671 /*
672 * Mark the table to avoid being used in
673 * acpi_table_initrd_scan() and check the revision.
674 */
675 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
676 existing_table->oem_revision >= table->oem_revision) {
677 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
678 goto next_table;
679 }
680
681 *length = table_length;
682 *address = acpi_tables_addr + table_offset;
683 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
684 table->signature, table->oem_id,
685 table->oem_table_id);
686 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
687 break;
688
689 next_table:
690 table_offset += table_length;
691 table_index++;
692 }
693 return AE_OK;
694 }
695
acpi_table_initrd_scan(void)696 static void __init acpi_table_initrd_scan(void)
697 {
698 int table_offset = 0;
699 int table_index = 0;
700 u32 table_length;
701 struct acpi_table_header *table;
702
703 if (!acpi_tables_addr)
704 return;
705
706 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
707 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
708 ACPI_HEADER_SIZE);
709 if (table_offset + table->length > all_tables_size) {
710 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
711 WARN_ON(1);
712 return;
713 }
714
715 table_length = table->length;
716
717 /* Skip RSDT/XSDT which should only be used for override */
718 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
719 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
720 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
721 goto next_table;
722 }
723 /*
724 * Mark the table to avoid being used in
725 * acpi_table_initrd_override(). Though this is not possible
726 * because override is disabled in acpi_install_table().
727 */
728 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
729 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
730 goto next_table;
731 }
732
733 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
734 table->signature, table->oem_id,
735 table->oem_table_id);
736 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
737 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
738 next_table:
739 table_offset += table_length;
740 table_index++;
741 }
742 }
743 #else
744 static acpi_status
acpi_table_initrd_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)745 acpi_table_initrd_override(struct acpi_table_header *existing_table,
746 acpi_physical_address *address,
747 u32 *table_length)
748 {
749 *table_length = 0;
750 *address = 0;
751 return AE_OK;
752 }
753
acpi_table_initrd_scan(void)754 static void __init acpi_table_initrd_scan(void)
755 {
756 }
757 #endif /* CONFIG_ACPI_TABLE_UPGRADE */
758
759 acpi_status
acpi_os_physical_table_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)760 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
761 acpi_physical_address *address,
762 u32 *table_length)
763 {
764 return acpi_table_initrd_override(existing_table, address,
765 table_length);
766 }
767
768 #ifdef CONFIG_ACPI_CUSTOM_DSDT
769 static void *amlcode __attribute__ ((weakref("AmlCode")));
770 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
771 #endif
772
acpi_os_table_override(struct acpi_table_header * existing_table,struct acpi_table_header ** new_table)773 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
774 struct acpi_table_header **new_table)
775 {
776 if (!existing_table || !new_table)
777 return AE_BAD_PARAMETER;
778
779 *new_table = NULL;
780
781 #ifdef CONFIG_ACPI_CUSTOM_DSDT
782 if (!strncmp(existing_table->signature, "DSDT", 4)) {
783 *new_table = (struct acpi_table_header *)&amlcode;
784 if (!(*new_table))
785 *new_table = (struct acpi_table_header *)&dsdt_amlcode;
786 }
787 #endif
788 if (*new_table != NULL)
789 acpi_table_taint(existing_table);
790 return AE_OK;
791 }
792
793 /*
794 * acpi_locate_initial_tables()
795 *
796 * find RSDP, find and checksum SDT/XSDT.
797 * checksum all tables, print SDT/XSDT
798 *
799 * result: sdt_entry[] is initialized
800 */
801
acpi_locate_initial_tables(void)802 int __init acpi_locate_initial_tables(void)
803 {
804 acpi_status status;
805
806 if (acpi_verify_table_checksum) {
807 pr_info("Early table checksum verification enabled\n");
808 acpi_gbl_enable_table_validation = TRUE;
809 } else {
810 pr_info("Early table checksum verification disabled\n");
811 acpi_gbl_enable_table_validation = FALSE;
812 }
813
814 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
815 if (ACPI_FAILURE(status))
816 return -EINVAL;
817
818 return 0;
819 }
820
acpi_reserve_initial_tables(void)821 void __init acpi_reserve_initial_tables(void)
822 {
823 int i;
824
825 for (i = 0; i < ACPI_MAX_TABLES; i++) {
826 struct acpi_table_desc *table_desc = &initial_tables[i];
827 u64 start = table_desc->address;
828 u64 size = table_desc->length;
829
830 if (!start || !size)
831 break;
832
833 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
834 table_desc->signature.ascii, start, start + size - 1);
835
836 memblock_reserve(start, size);
837 }
838 }
839
acpi_table_init_complete(void)840 void __init acpi_table_init_complete(void)
841 {
842 acpi_table_initrd_scan();
843 check_multiple_madt();
844 }
845
acpi_table_init(void)846 int __init acpi_table_init(void)
847 {
848 int ret;
849
850 ret = acpi_locate_initial_tables();
851 if (ret)
852 return ret;
853
854 acpi_table_init_complete();
855
856 return 0;
857 }
858
acpi_parse_apic_instance(char * str)859 static int __init acpi_parse_apic_instance(char *str)
860 {
861 if (!str)
862 return -EINVAL;
863
864 if (kstrtoint(str, 0, &acpi_apic_instance))
865 return -EINVAL;
866
867 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
868
869 return 0;
870 }
871 early_param("acpi_apic_instance", acpi_parse_apic_instance);
872
acpi_force_table_verification_setup(char * s)873 static int __init acpi_force_table_verification_setup(char *s)
874 {
875 acpi_verify_table_checksum = true;
876
877 return 0;
878 }
879 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
880
acpi_force_32bit_fadt_addr(char * s)881 static int __init acpi_force_32bit_fadt_addr(char *s)
882 {
883 pr_info("Forcing 32 Bit FADT addresses\n");
884 acpi_gbl_use32_bit_fadt_addresses = TRUE;
885
886 return 0;
887 }
888 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);
889