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_or_acpilib;
39
40 enum acpi_subtable_type {
41 ACPI_SUBTABLE_COMMON,
42 ACPI_SUBTABLE_HMAT,
43 ACPI_SUBTABLE_PRMT,
44 ACPI_SUBTABLE_CEDT,
45 };
46
47 struct acpi_subtable_entry {
48 union acpi_subtable_headers *hdr;
49 enum acpi_subtable_type type;
50 };
51
52 /*
53 * Disable table checksum verification for the early stage due to the size
54 * limitation of the current x86 early mapping implementation.
55 */
56 static bool acpi_verify_table_checksum __initdata_or_acpilib = false;
57
acpi_table_print_madt_entry(struct acpi_subtable_header * header)58 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
59 {
60 if (!header)
61 return;
62
63 switch (header->type) {
64
65 case ACPI_MADT_TYPE_LOCAL_APIC:
66 {
67 struct acpi_madt_local_apic *p =
68 (struct acpi_madt_local_apic *)header;
69 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
70 p->processor_id, p->id,
71 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
72 }
73 break;
74
75 case ACPI_MADT_TYPE_LOCAL_X2APIC:
76 {
77 struct acpi_madt_local_x2apic *p =
78 (struct acpi_madt_local_x2apic *)header;
79 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
80 p->local_apic_id, p->uid,
81 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
82 }
83 break;
84
85 case ACPI_MADT_TYPE_IO_APIC:
86 {
87 struct acpi_madt_io_apic *p =
88 (struct acpi_madt_io_apic *)header;
89 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
90 p->id, p->address, p->global_irq_base);
91 }
92 break;
93
94 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
95 {
96 struct acpi_madt_interrupt_override *p =
97 (struct acpi_madt_interrupt_override *)header;
98 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
99 p->bus, p->source_irq, p->global_irq,
100 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
101 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
102 if (p->inti_flags &
103 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
104 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
105 p->inti_flags &
106 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
107 }
108 break;
109
110 case ACPI_MADT_TYPE_NMI_SOURCE:
111 {
112 struct acpi_madt_nmi_source *p =
113 (struct acpi_madt_nmi_source *)header;
114 pr_info("NMI_SRC (%s %s global_irq %d)\n",
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->global_irq);
118 }
119 break;
120
121 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
122 {
123 struct acpi_madt_local_apic_nmi *p =
124 (struct acpi_madt_local_apic_nmi *)header;
125 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
126 p->processor_id,
127 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
128 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
129 p->lint);
130 }
131 break;
132
133 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
134 {
135 u16 polarity, trigger;
136 struct acpi_madt_local_x2apic_nmi *p =
137 (struct acpi_madt_local_x2apic_nmi *)header;
138
139 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
140 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
141
142 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
143 p->uid,
144 mps_inti_flags_polarity[polarity],
145 mps_inti_flags_trigger[trigger],
146 p->lint);
147 }
148 break;
149
150 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
151 {
152 struct acpi_madt_local_apic_override *p =
153 (struct acpi_madt_local_apic_override *)header;
154 pr_info("LAPIC_ADDR_OVR (address[0x%llx])\n",
155 p->address);
156 }
157 break;
158
159 case ACPI_MADT_TYPE_IO_SAPIC:
160 {
161 struct acpi_madt_io_sapic *p =
162 (struct acpi_madt_io_sapic *)header;
163 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
164 p->id, (void *)(unsigned long)p->address,
165 p->global_irq_base);
166 }
167 break;
168
169 case ACPI_MADT_TYPE_LOCAL_SAPIC:
170 {
171 struct acpi_madt_local_sapic *p =
172 (struct acpi_madt_local_sapic *)header;
173 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
174 p->processor_id, p->id, p->eid,
175 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
176 }
177 break;
178
179 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
180 {
181 struct acpi_madt_interrupt_source *p =
182 (struct acpi_madt_interrupt_source *)header;
183 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",
184 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
185 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
186 p->type, p->id, p->eid, p->io_sapic_vector,
187 p->global_irq);
188 }
189 break;
190
191 case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
192 {
193 struct acpi_madt_generic_interrupt *p =
194 (struct acpi_madt_generic_interrupt *)header;
195 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
196 p->uid, p->base_address,
197 p->arm_mpidr,
198 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
199
200 }
201 break;
202
203 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
204 {
205 struct acpi_madt_generic_distributor *p =
206 (struct acpi_madt_generic_distributor *)header;
207 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
208 p->gic_id, p->base_address,
209 p->global_irq_base);
210 }
211 break;
212
213 default:
214 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
215 header->type);
216 break;
217 }
218 }
219
220 static unsigned long __init_or_acpilib
acpi_get_entry_type(struct acpi_subtable_entry * entry)221 acpi_get_entry_type(struct acpi_subtable_entry *entry)
222 {
223 switch (entry->type) {
224 case ACPI_SUBTABLE_COMMON:
225 return entry->hdr->common.type;
226 case ACPI_SUBTABLE_HMAT:
227 return entry->hdr->hmat.type;
228 case ACPI_SUBTABLE_PRMT:
229 return 0;
230 case ACPI_SUBTABLE_CEDT:
231 return entry->hdr->cedt.type;
232 }
233 return 0;
234 }
235
236 static unsigned long __init_or_acpilib
acpi_get_entry_length(struct acpi_subtable_entry * entry)237 acpi_get_entry_length(struct acpi_subtable_entry *entry)
238 {
239 switch (entry->type) {
240 case ACPI_SUBTABLE_COMMON:
241 return entry->hdr->common.length;
242 case ACPI_SUBTABLE_HMAT:
243 return entry->hdr->hmat.length;
244 case ACPI_SUBTABLE_PRMT:
245 return entry->hdr->prmt.length;
246 case ACPI_SUBTABLE_CEDT:
247 return entry->hdr->cedt.length;
248 }
249 return 0;
250 }
251
252 static unsigned long __init_or_acpilib
acpi_get_subtable_header_length(struct acpi_subtable_entry * entry)253 acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
254 {
255 switch (entry->type) {
256 case ACPI_SUBTABLE_COMMON:
257 return sizeof(entry->hdr->common);
258 case ACPI_SUBTABLE_HMAT:
259 return sizeof(entry->hdr->hmat);
260 case ACPI_SUBTABLE_PRMT:
261 return sizeof(entry->hdr->prmt);
262 case ACPI_SUBTABLE_CEDT:
263 return sizeof(entry->hdr->cedt);
264 }
265 return 0;
266 }
267
268 static enum acpi_subtable_type __init_or_acpilib
acpi_get_subtable_type(char * id)269 acpi_get_subtable_type(char *id)
270 {
271 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
272 return ACPI_SUBTABLE_HMAT;
273 if (strncmp(id, ACPI_SIG_PRMT, 4) == 0)
274 return ACPI_SUBTABLE_PRMT;
275 if (strncmp(id, ACPI_SIG_CEDT, 4) == 0)
276 return ACPI_SUBTABLE_CEDT;
277 return ACPI_SUBTABLE_COMMON;
278 }
279
has_handler(struct acpi_subtable_proc * proc)280 static __init_or_acpilib bool has_handler(struct acpi_subtable_proc *proc)
281 {
282 return proc->handler || proc->handler_arg;
283 }
284
call_handler(struct acpi_subtable_proc * proc,union acpi_subtable_headers * hdr,unsigned long end)285 static __init_or_acpilib int call_handler(struct acpi_subtable_proc *proc,
286 union acpi_subtable_headers *hdr,
287 unsigned long end)
288 {
289 if (proc->handler)
290 return proc->handler(hdr, end);
291 if (proc->handler_arg)
292 return proc->handler_arg(hdr, proc->arg, end);
293 return -EINVAL;
294 }
295
296 /**
297 * acpi_parse_entries_array - for each proc_num find a suitable subtable
298 *
299 * @id: table id (for debugging purposes)
300 * @table_size: size of the root table
301 * @table_header: where does the table start?
302 * @proc: array of acpi_subtable_proc struct containing entry id
303 * and associated handler with it
304 * @proc_num: how big proc is?
305 * @max_entries: how many entries can we process?
306 *
307 * For each proc_num find a subtable with proc->id and run proc->handler
308 * on it. Assumption is that there's only single handler for particular
309 * entry id.
310 *
311 * The table_size is not the size of the complete ACPI table (the length
312 * field in the header struct), but only the size of the root table; i.e.,
313 * the offset from the very first byte of the complete ACPI table, to the
314 * first byte of the very first subtable.
315 *
316 * On success returns sum of all matching entries for all proc handlers.
317 * Otherwise, -ENODEV or -EINVAL is returned.
318 */
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)319 static int __init_or_acpilib acpi_parse_entries_array(
320 char *id, unsigned long table_size,
321 struct acpi_table_header *table_header, struct acpi_subtable_proc *proc,
322 int proc_num, unsigned int max_entries)
323 {
324 struct acpi_subtable_entry entry;
325 unsigned long table_end, subtable_len, entry_len;
326 int count = 0;
327 int errs = 0;
328 int i;
329
330 table_end = (unsigned long)table_header + table_header->length;
331
332 /* Parse all entries looking for a match. */
333
334 entry.type = acpi_get_subtable_type(id);
335 entry.hdr = (union acpi_subtable_headers *)
336 ((unsigned long)table_header + table_size);
337 subtable_len = acpi_get_subtable_header_length(&entry);
338
339 while (((unsigned long)entry.hdr) + subtable_len < table_end) {
340 if (max_entries && count >= max_entries)
341 break;
342
343 for (i = 0; i < proc_num; i++) {
344 if (acpi_get_entry_type(&entry) != proc[i].id)
345 continue;
346 if (!has_handler(&proc[i]) ||
347 (!errs &&
348 call_handler(&proc[i], entry.hdr, table_end))) {
349 errs++;
350 continue;
351 }
352
353 proc[i].count++;
354 break;
355 }
356 if (i != proc_num)
357 count++;
358
359 /*
360 * If entry->length is 0, break from this loop to avoid
361 * infinite loop.
362 */
363 entry_len = acpi_get_entry_length(&entry);
364 if (entry_len == 0) {
365 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
366 return -EINVAL;
367 }
368
369 entry.hdr = (union acpi_subtable_headers *)
370 ((unsigned long)entry.hdr + entry_len);
371 }
372
373 if (max_entries && count > max_entries) {
374 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
375 id, proc->id, count);
376 }
377
378 return errs ? -EINVAL : count;
379 }
380
acpi_table_parse_entries_array(char * id,unsigned long table_size,struct acpi_subtable_proc * proc,int proc_num,unsigned int max_entries)381 int __init_or_acpilib acpi_table_parse_entries_array(
382 char *id, unsigned long table_size, struct acpi_subtable_proc *proc,
383 int proc_num, unsigned int max_entries)
384 {
385 struct acpi_table_header *table_header = NULL;
386 int count;
387 u32 instance = 0;
388
389 if (acpi_disabled)
390 return -ENODEV;
391
392 if (!id)
393 return -EINVAL;
394
395 if (!table_size)
396 return -EINVAL;
397
398 if (!strncmp(id, ACPI_SIG_MADT, 4))
399 instance = acpi_apic_instance;
400
401 acpi_get_table(id, instance, &table_header);
402 if (!table_header) {
403 pr_debug("%4.4s not present\n", id);
404 return -ENODEV;
405 }
406
407 count = acpi_parse_entries_array(id, table_size, table_header,
408 proc, proc_num, max_entries);
409
410 acpi_put_table(table_header);
411 return count;
412 }
413
__acpi_table_parse_entries(char * id,unsigned long table_size,int entry_id,acpi_tbl_entry_handler handler,acpi_tbl_entry_handler_arg handler_arg,void * arg,unsigned int max_entries)414 static int __init_or_acpilib __acpi_table_parse_entries(
415 char *id, unsigned long table_size, int entry_id,
416 acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg,
417 void *arg, unsigned int max_entries)
418 {
419 struct acpi_subtable_proc proc = {
420 .id = entry_id,
421 .handler = handler,
422 .handler_arg = handler_arg,
423 .arg = arg,
424 };
425
426 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
427 max_entries);
428 }
429
430 int __init_or_acpilib
acpi_table_parse_cedt(enum acpi_cedt_type id,acpi_tbl_entry_handler_arg handler_arg,void * arg)431 acpi_table_parse_cedt(enum acpi_cedt_type id,
432 acpi_tbl_entry_handler_arg handler_arg, void *arg)
433 {
434 return __acpi_table_parse_entries(ACPI_SIG_CEDT,
435 sizeof(struct acpi_table_cedt), id,
436 NULL, handler_arg, arg, 0);
437 }
438 EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt);
439
acpi_table_parse_entries(char * id,unsigned long table_size,int entry_id,acpi_tbl_entry_handler handler,unsigned int max_entries)440 int __init acpi_table_parse_entries(char *id, unsigned long table_size,
441 int entry_id,
442 acpi_tbl_entry_handler handler,
443 unsigned int max_entries)
444 {
445 return __acpi_table_parse_entries(id, table_size, entry_id, handler,
446 NULL, NULL, max_entries);
447 }
448
acpi_table_parse_madt(enum acpi_madt_type id,acpi_tbl_entry_handler handler,unsigned int max_entries)449 int __init acpi_table_parse_madt(enum acpi_madt_type id,
450 acpi_tbl_entry_handler handler, unsigned int max_entries)
451 {
452 return acpi_table_parse_entries(ACPI_SIG_MADT,
453 sizeof(struct acpi_table_madt), id,
454 handler, max_entries);
455 }
456
457 /**
458 * acpi_table_parse - find table with @id, run @handler on it
459 * @id: table id to find
460 * @handler: handler to run
461 *
462 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
463 * run @handler on it.
464 *
465 * Return 0 if table found, -errno if not.
466 */
acpi_table_parse(char * id,acpi_tbl_table_handler handler)467 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
468 {
469 struct acpi_table_header *table = NULL;
470
471 if (acpi_disabled)
472 return -ENODEV;
473
474 if (!id || !handler)
475 return -EINVAL;
476
477 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
478 acpi_get_table(id, acpi_apic_instance, &table);
479 else
480 acpi_get_table(id, 0, &table);
481
482 if (table) {
483 handler(table);
484 acpi_put_table(table);
485 return 0;
486 } else
487 return -ENODEV;
488 }
489
490 /*
491 * The BIOS is supposed to supply a single APIC/MADT,
492 * but some report two. Provide a knob to use either.
493 * (don't you wish instance 0 and 1 were not the same?)
494 */
check_multiple_madt(void)495 static void __init check_multiple_madt(void)
496 {
497 struct acpi_table_header *table = NULL;
498
499 acpi_get_table(ACPI_SIG_MADT, 2, &table);
500 if (table) {
501 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
502 acpi_apic_instance);
503 pr_warn("If \"acpi_apic_instance=%d\" works better, "
504 "notify linux-acpi@vger.kernel.org\n",
505 acpi_apic_instance ? 0 : 2);
506 acpi_put_table(table);
507
508 } else
509 acpi_apic_instance = 0;
510
511 return;
512 }
513
acpi_table_taint(struct acpi_table_header * table)514 static void acpi_table_taint(struct acpi_table_header *table)
515 {
516 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
517 table->signature, table->oem_table_id);
518 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
519 }
520
521 #ifdef CONFIG_ACPI_TABLE_UPGRADE
522 static u64 acpi_tables_addr;
523 static int all_tables_size;
524
525 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
acpi_table_checksum(u8 * buffer,u32 length)526 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
527 {
528 u8 sum = 0;
529 u8 *end = buffer + length;
530
531 while (buffer < end)
532 sum = (u8) (sum + *(buffer++));
533 return sum;
534 }
535
536 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
537 static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
538 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
539 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
540 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
541 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
542 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
543 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
544 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
545 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
546 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
547 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
548 ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI };
549
550 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
551
552 #define NR_ACPI_INITRD_TABLES 64
553 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
554 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
555
556 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
557
acpi_table_upgrade(void)558 void __init acpi_table_upgrade(void)
559 {
560 void *data;
561 size_t size;
562 int sig, no, table_nr = 0, total_offset = 0;
563 long offset = 0;
564 struct acpi_table_header *table;
565 char cpio_path[32] = "kernel/firmware/acpi/";
566 struct cpio_data file;
567
568 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
569 data = __initramfs_start;
570 size = __initramfs_size;
571 } else {
572 data = (void *)initrd_start;
573 size = initrd_end - initrd_start;
574 }
575
576 if (data == NULL || size == 0)
577 return;
578
579 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
580 file = find_cpio_data(cpio_path, data, size, &offset);
581 if (!file.data)
582 break;
583
584 data += offset;
585 size -= offset;
586
587 if (file.size < sizeof(struct acpi_table_header)) {
588 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
589 cpio_path, file.name);
590 continue;
591 }
592
593 table = file.data;
594
595 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
596 if (!memcmp(table->signature, table_sigs[sig], 4))
597 break;
598
599 if (sig >= ARRAY_SIZE(table_sigs)) {
600 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
601 cpio_path, file.name);
602 continue;
603 }
604 if (file.size != table->length) {
605 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
606 cpio_path, file.name);
607 continue;
608 }
609 if (acpi_table_checksum(file.data, table->length)) {
610 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
611 cpio_path, file.name);
612 continue;
613 }
614
615 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
616 table->signature, cpio_path, file.name, table->length);
617
618 all_tables_size += table->length;
619 acpi_initrd_files[table_nr].data = file.data;
620 acpi_initrd_files[table_nr].size = file.size;
621 table_nr++;
622 }
623 if (table_nr == 0)
624 return;
625
626 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
627 pr_notice("kernel is locked down, ignoring table override\n");
628 return;
629 }
630
631 acpi_tables_addr =
632 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE,
633 0, ACPI_TABLE_UPGRADE_MAX_PHYS);
634 if (!acpi_tables_addr) {
635 WARN_ON(1);
636 return;
637 }
638 /*
639 * Only calling e820_add_reserve does not work and the
640 * tables are invalid (memory got used) later.
641 * memblock_reserve works as expected and the tables won't get modified.
642 * But it's not enough on X86 because ioremap will
643 * complain later (used by acpi_os_map_memory) that the pages
644 * that should get mapped are not marked "reserved".
645 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
646 * works fine.
647 */
648 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
649
650 kmemleak_ignore_phys(acpi_tables_addr);
651
652 /*
653 * early_ioremap only can remap 256k one time. If we map all
654 * tables one time, we will hit the limit. Need to map chunks
655 * one by one during copying the same as that in relocate_initrd().
656 */
657 for (no = 0; no < table_nr; no++) {
658 unsigned char *src_p = acpi_initrd_files[no].data;
659 phys_addr_t size = acpi_initrd_files[no].size;
660 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
661 phys_addr_t slop, clen;
662 char *dest_p;
663
664 total_offset += size;
665
666 while (size) {
667 slop = dest_addr & ~PAGE_MASK;
668 clen = size;
669 if (clen > MAP_CHUNK_SIZE - slop)
670 clen = MAP_CHUNK_SIZE - slop;
671 dest_p = early_memremap(dest_addr & PAGE_MASK,
672 clen + slop);
673 memcpy(dest_p + slop, src_p, clen);
674 early_memunmap(dest_p, clen + slop);
675 src_p += clen;
676 dest_addr += clen;
677 size -= clen;
678 }
679 }
680 }
681
682 static acpi_status
acpi_table_initrd_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * length)683 acpi_table_initrd_override(struct acpi_table_header *existing_table,
684 acpi_physical_address *address, u32 *length)
685 {
686 int table_offset = 0;
687 int table_index = 0;
688 struct acpi_table_header *table;
689 u32 table_length;
690
691 *length = 0;
692 *address = 0;
693 if (!acpi_tables_addr)
694 return AE_OK;
695
696 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
697 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
698 ACPI_HEADER_SIZE);
699 if (table_offset + table->length > all_tables_size) {
700 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
701 WARN_ON(1);
702 return AE_OK;
703 }
704
705 table_length = table->length;
706
707 /* Only override tables matched */
708 if (memcmp(existing_table->signature, table->signature, 4) ||
709 memcmp(table->oem_id, existing_table->oem_id,
710 ACPI_OEM_ID_SIZE) ||
711 memcmp(table->oem_table_id, existing_table->oem_table_id,
712 ACPI_OEM_TABLE_ID_SIZE)) {
713 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
714 goto next_table;
715 }
716 /*
717 * Mark the table to avoid being used in
718 * acpi_table_initrd_scan() and check the revision.
719 */
720 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
721 existing_table->oem_revision >= table->oem_revision) {
722 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
723 goto next_table;
724 }
725
726 *length = table_length;
727 *address = acpi_tables_addr + table_offset;
728 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
729 table->signature, table->oem_id,
730 table->oem_table_id);
731 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
732 break;
733
734 next_table:
735 table_offset += table_length;
736 table_index++;
737 }
738 return AE_OK;
739 }
740
acpi_table_initrd_scan(void)741 static void __init acpi_table_initrd_scan(void)
742 {
743 int table_offset = 0;
744 int table_index = 0;
745 u32 table_length;
746 struct acpi_table_header *table;
747
748 if (!acpi_tables_addr)
749 return;
750
751 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
752 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
753 ACPI_HEADER_SIZE);
754 if (table_offset + table->length > all_tables_size) {
755 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
756 WARN_ON(1);
757 return;
758 }
759
760 table_length = table->length;
761
762 /* Skip RSDT/XSDT which should only be used for override */
763 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
764 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
765 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
766 goto next_table;
767 }
768 /*
769 * Mark the table to avoid being used in
770 * acpi_table_initrd_override(). Though this is not possible
771 * because override is disabled in acpi_install_physical_table().
772 */
773 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
774 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
775 goto next_table;
776 }
777
778 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
779 table->signature, table->oem_id,
780 table->oem_table_id);
781 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
782 acpi_install_physical_table(acpi_tables_addr + table_offset);
783 next_table:
784 table_offset += table_length;
785 table_index++;
786 }
787 }
788 #else
789 static acpi_status
acpi_table_initrd_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)790 acpi_table_initrd_override(struct acpi_table_header *existing_table,
791 acpi_physical_address *address,
792 u32 *table_length)
793 {
794 *table_length = 0;
795 *address = 0;
796 return AE_OK;
797 }
798
acpi_table_initrd_scan(void)799 static void __init acpi_table_initrd_scan(void)
800 {
801 }
802 #endif /* CONFIG_ACPI_TABLE_UPGRADE */
803
804 acpi_status
acpi_os_physical_table_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)805 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
806 acpi_physical_address *address,
807 u32 *table_length)
808 {
809 return acpi_table_initrd_override(existing_table, address,
810 table_length);
811 }
812
813 #ifdef CONFIG_ACPI_CUSTOM_DSDT
814 static void *amlcode __attribute__ ((weakref("AmlCode")));
815 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
816 #endif
817
acpi_os_table_override(struct acpi_table_header * existing_table,struct acpi_table_header ** new_table)818 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
819 struct acpi_table_header **new_table)
820 {
821 if (!existing_table || !new_table)
822 return AE_BAD_PARAMETER;
823
824 *new_table = NULL;
825
826 #ifdef CONFIG_ACPI_CUSTOM_DSDT
827 if (!strncmp(existing_table->signature, "DSDT", 4)) {
828 *new_table = (struct acpi_table_header *)&amlcode;
829 if (!(*new_table))
830 *new_table = (struct acpi_table_header *)&dsdt_amlcode;
831 }
832 #endif
833 if (*new_table != NULL)
834 acpi_table_taint(existing_table);
835 return AE_OK;
836 }
837
838 /*
839 * acpi_locate_initial_tables()
840 *
841 * find RSDP, find and checksum SDT/XSDT.
842 * checksum all tables, print SDT/XSDT
843 *
844 * result: sdt_entry[] is initialized
845 */
846
acpi_locate_initial_tables(void)847 int __init acpi_locate_initial_tables(void)
848 {
849 acpi_status status;
850
851 if (acpi_verify_table_checksum) {
852 pr_info("Early table checksum verification enabled\n");
853 acpi_gbl_enable_table_validation = TRUE;
854 } else {
855 pr_info("Early table checksum verification disabled\n");
856 acpi_gbl_enable_table_validation = FALSE;
857 }
858
859 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
860 if (ACPI_FAILURE(status))
861 return -EINVAL;
862
863 return 0;
864 }
865
acpi_reserve_initial_tables(void)866 void __init acpi_reserve_initial_tables(void)
867 {
868 int i;
869
870 for (i = 0; i < ACPI_MAX_TABLES; i++) {
871 struct acpi_table_desc *table_desc = &initial_tables[i];
872 u64 start = table_desc->address;
873 u64 size = table_desc->length;
874
875 if (!start || !size)
876 break;
877
878 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
879 table_desc->signature.ascii, start, start + size - 1);
880
881 memblock_reserve(start, size);
882 }
883 }
884
acpi_table_init_complete(void)885 void __init acpi_table_init_complete(void)
886 {
887 acpi_table_initrd_scan();
888 check_multiple_madt();
889 }
890
acpi_table_init(void)891 int __init acpi_table_init(void)
892 {
893 int ret;
894
895 ret = acpi_locate_initial_tables();
896 if (ret)
897 return ret;
898
899 acpi_table_init_complete();
900
901 return 0;
902 }
903
acpi_parse_apic_instance(char * str)904 static int __init acpi_parse_apic_instance(char *str)
905 {
906 if (!str)
907 return -EINVAL;
908
909 if (kstrtoint(str, 0, &acpi_apic_instance))
910 return -EINVAL;
911
912 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
913
914 return 0;
915 }
916 early_param("acpi_apic_instance", acpi_parse_apic_instance);
917
acpi_force_table_verification_setup(char * s)918 static int __init acpi_force_table_verification_setup(char *s)
919 {
920 acpi_verify_table_checksum = true;
921
922 return 0;
923 }
924 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
925
acpi_force_32bit_fadt_addr(char * s)926 static int __init acpi_force_32bit_fadt_addr(char *s)
927 {
928 pr_info("Forcing 32 Bit FADT addresses\n");
929 acpi_gbl_use32_bit_fadt_addresses = TRUE;
930
931 return 0;
932 }
933 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);
934