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x86, efi: Mark disable_runtime as __initdata
[deliverable/linux.git] / arch / x86 / platform / efi / efi.c
1 /*
2 * Common EFI (Extensible Firmware Interface) support functions
3 * Based on Extensible Firmware Interface Specification version 1.0
4 *
5 * Copyright (C) 1999 VA Linux Systems
6 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
7 * Copyright (C) 1999-2002 Hewlett-Packard Co.
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 * Stephane Eranian <eranian@hpl.hp.com>
10 * Copyright (C) 2005-2008 Intel Co.
11 * Fenghua Yu <fenghua.yu@intel.com>
12 * Bibo Mao <bibo.mao@intel.com>
13 * Chandramouli Narayanan <mouli@linux.intel.com>
14 * Huang Ying <ying.huang@intel.com>
15 *
16 * Copied from efi_32.c to eliminate the duplicated code between EFI
17 * 32/64 support code. --ying 2007-10-26
18 *
19 * All EFI Runtime Services are not implemented yet as EFI only
20 * supports physical mode addressing on SoftSDV. This is to be fixed
21 * in a future version. --drummond 1999-07-20
22 *
23 * Implemented EFI runtime services and virtual mode calls. --davidm
24 *
25 * Goutham Rao: <goutham.rao@intel.com>
26 * Skip non-WB memory and ignore empty memory ranges.
27 */
28
29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31 #include <linux/kernel.h>
32 #include <linux/init.h>
33 #include <linux/efi.h>
34 #include <linux/efi-bgrt.h>
35 #include <linux/export.h>
36 #include <linux/bootmem.h>
37 #include <linux/memblock.h>
38 #include <linux/spinlock.h>
39 #include <linux/uaccess.h>
40 #include <linux/time.h>
41 #include <linux/io.h>
42 #include <linux/reboot.h>
43 #include <linux/bcd.h>
44
45 #include <asm/setup.h>
46 #include <asm/efi.h>
47 #include <asm/time.h>
48 #include <asm/cacheflush.h>
49 #include <asm/tlbflush.h>
50 #include <asm/x86_init.h>
51
52 #define EFI_DEBUG 1
53
54 struct efi __read_mostly efi = {
55 .mps = EFI_INVALID_TABLE_ADDR,
56 .acpi = EFI_INVALID_TABLE_ADDR,
57 .acpi20 = EFI_INVALID_TABLE_ADDR,
58 .smbios = EFI_INVALID_TABLE_ADDR,
59 .sal_systab = EFI_INVALID_TABLE_ADDR,
60 .boot_info = EFI_INVALID_TABLE_ADDR,
61 .hcdp = EFI_INVALID_TABLE_ADDR,
62 .uga = EFI_INVALID_TABLE_ADDR,
63 .uv_systab = EFI_INVALID_TABLE_ADDR,
64 };
65 EXPORT_SYMBOL(efi);
66
67 struct efi_memory_map memmap;
68
69 static struct efi efi_phys __initdata;
70 static efi_system_table_t efi_systab __initdata;
71
72 static inline bool efi_is_native(void)
73 {
74 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
75 }
76
77 unsigned long x86_efi_facility;
78
79 /*
80 * Returns 1 if 'facility' is enabled, 0 otherwise.
81 */
82 int efi_enabled(int facility)
83 {
84 return test_bit(facility, &x86_efi_facility) != 0;
85 }
86 EXPORT_SYMBOL(efi_enabled);
87
88 static bool __initdata disable_runtime = false;
89 static int __init setup_noefi(char *arg)
90 {
91 disable_runtime = true;
92 return 0;
93 }
94 early_param("noefi", setup_noefi);
95
96 int add_efi_memmap;
97 EXPORT_SYMBOL(add_efi_memmap);
98
99 static int __init setup_add_efi_memmap(char *arg)
100 {
101 add_efi_memmap = 1;
102 return 0;
103 }
104 early_param("add_efi_memmap", setup_add_efi_memmap);
105
106
107 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
108 {
109 unsigned long flags;
110 efi_status_t status;
111
112 spin_lock_irqsave(&rtc_lock, flags);
113 status = efi_call_virt2(get_time, tm, tc);
114 spin_unlock_irqrestore(&rtc_lock, flags);
115 return status;
116 }
117
118 static efi_status_t virt_efi_set_time(efi_time_t *tm)
119 {
120 unsigned long flags;
121 efi_status_t status;
122
123 spin_lock_irqsave(&rtc_lock, flags);
124 status = efi_call_virt1(set_time, tm);
125 spin_unlock_irqrestore(&rtc_lock, flags);
126 return status;
127 }
128
129 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
130 efi_bool_t *pending,
131 efi_time_t *tm)
132 {
133 unsigned long flags;
134 efi_status_t status;
135
136 spin_lock_irqsave(&rtc_lock, flags);
137 status = efi_call_virt3(get_wakeup_time,
138 enabled, pending, tm);
139 spin_unlock_irqrestore(&rtc_lock, flags);
140 return status;
141 }
142
143 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
144 {
145 unsigned long flags;
146 efi_status_t status;
147
148 spin_lock_irqsave(&rtc_lock, flags);
149 status = efi_call_virt2(set_wakeup_time,
150 enabled, tm);
151 spin_unlock_irqrestore(&rtc_lock, flags);
152 return status;
153 }
154
155 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
156 efi_guid_t *vendor,
157 u32 *attr,
158 unsigned long *data_size,
159 void *data)
160 {
161 return efi_call_virt5(get_variable,
162 name, vendor, attr,
163 data_size, data);
164 }
165
166 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
167 efi_char16_t *name,
168 efi_guid_t *vendor)
169 {
170 return efi_call_virt3(get_next_variable,
171 name_size, name, vendor);
172 }
173
174 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
175 efi_guid_t *vendor,
176 u32 attr,
177 unsigned long data_size,
178 void *data)
179 {
180 return efi_call_virt5(set_variable,
181 name, vendor, attr,
182 data_size, data);
183 }
184
185 static efi_status_t virt_efi_query_variable_info(u32 attr,
186 u64 *storage_space,
187 u64 *remaining_space,
188 u64 *max_variable_size)
189 {
190 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
191 return EFI_UNSUPPORTED;
192
193 return efi_call_virt4(query_variable_info, attr, storage_space,
194 remaining_space, max_variable_size);
195 }
196
197 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
198 {
199 return efi_call_virt1(get_next_high_mono_count, count);
200 }
201
202 static void virt_efi_reset_system(int reset_type,
203 efi_status_t status,
204 unsigned long data_size,
205 efi_char16_t *data)
206 {
207 efi_call_virt4(reset_system, reset_type, status,
208 data_size, data);
209 }
210
211 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
212 unsigned long count,
213 unsigned long sg_list)
214 {
215 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
216 return EFI_UNSUPPORTED;
217
218 return efi_call_virt3(update_capsule, capsules, count, sg_list);
219 }
220
221 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
222 unsigned long count,
223 u64 *max_size,
224 int *reset_type)
225 {
226 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
227 return EFI_UNSUPPORTED;
228
229 return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
230 reset_type);
231 }
232
233 static efi_status_t __init phys_efi_set_virtual_address_map(
234 unsigned long memory_map_size,
235 unsigned long descriptor_size,
236 u32 descriptor_version,
237 efi_memory_desc_t *virtual_map)
238 {
239 efi_status_t status;
240
241 efi_call_phys_prelog();
242 status = efi_call_phys4(efi_phys.set_virtual_address_map,
243 memory_map_size, descriptor_size,
244 descriptor_version, virtual_map);
245 efi_call_phys_epilog();
246 return status;
247 }
248
249 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
250 efi_time_cap_t *tc)
251 {
252 unsigned long flags;
253 efi_status_t status;
254
255 spin_lock_irqsave(&rtc_lock, flags);
256 efi_call_phys_prelog();
257 status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
258 virt_to_phys(tc));
259 efi_call_phys_epilog();
260 spin_unlock_irqrestore(&rtc_lock, flags);
261 return status;
262 }
263
264 int efi_set_rtc_mmss(unsigned long nowtime)
265 {
266 int real_seconds, real_minutes;
267 efi_status_t status;
268 efi_time_t eft;
269 efi_time_cap_t cap;
270
271 status = efi.get_time(&eft, &cap);
272 if (status != EFI_SUCCESS) {
273 pr_err("Oops: efitime: can't read time!\n");
274 return -1;
275 }
276
277 real_seconds = nowtime % 60;
278 real_minutes = nowtime / 60;
279 if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
280 real_minutes += 30;
281 real_minutes %= 60;
282 eft.minute = real_minutes;
283 eft.second = real_seconds;
284
285 status = efi.set_time(&eft);
286 if (status != EFI_SUCCESS) {
287 pr_err("Oops: efitime: can't write time!\n");
288 return -1;
289 }
290 return 0;
291 }
292
293 unsigned long efi_get_time(void)
294 {
295 efi_status_t status;
296 efi_time_t eft;
297 efi_time_cap_t cap;
298
299 status = efi.get_time(&eft, &cap);
300 if (status != EFI_SUCCESS)
301 pr_err("Oops: efitime: can't read time!\n");
302
303 return mktime(eft.year, eft.month, eft.day, eft.hour,
304 eft.minute, eft.second);
305 }
306
307 /*
308 * Tell the kernel about the EFI memory map. This might include
309 * more than the max 128 entries that can fit in the e820 legacy
310 * (zeropage) memory map.
311 */
312
313 static void __init do_add_efi_memmap(void)
314 {
315 void *p;
316
317 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
318 efi_memory_desc_t *md = p;
319 unsigned long long start = md->phys_addr;
320 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
321 int e820_type;
322
323 switch (md->type) {
324 case EFI_LOADER_CODE:
325 case EFI_LOADER_DATA:
326 case EFI_BOOT_SERVICES_CODE:
327 case EFI_BOOT_SERVICES_DATA:
328 case EFI_CONVENTIONAL_MEMORY:
329 if (md->attribute & EFI_MEMORY_WB)
330 e820_type = E820_RAM;
331 else
332 e820_type = E820_RESERVED;
333 break;
334 case EFI_ACPI_RECLAIM_MEMORY:
335 e820_type = E820_ACPI;
336 break;
337 case EFI_ACPI_MEMORY_NVS:
338 e820_type = E820_NVS;
339 break;
340 case EFI_UNUSABLE_MEMORY:
341 e820_type = E820_UNUSABLE;
342 break;
343 default:
344 /*
345 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
346 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
347 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
348 */
349 e820_type = E820_RESERVED;
350 break;
351 }
352 e820_add_region(start, size, e820_type);
353 }
354 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
355 }
356
357 int __init efi_memblock_x86_reserve_range(void)
358 {
359 unsigned long pmap;
360
361 #ifdef CONFIG_X86_32
362 /* Can't handle data above 4GB at this time */
363 if (boot_params.efi_info.efi_memmap_hi) {
364 pr_err("Memory map is above 4GB, disabling EFI.\n");
365 return -EINVAL;
366 }
367 pmap = boot_params.efi_info.efi_memmap;
368 #else
369 pmap = (boot_params.efi_info.efi_memmap |
370 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
371 #endif
372 memmap.phys_map = (void *)pmap;
373 memmap.nr_map = boot_params.efi_info.efi_memmap_size /
374 boot_params.efi_info.efi_memdesc_size;
375 memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
376 memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
377 memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
378
379 return 0;
380 }
381
382 #if EFI_DEBUG
383 static void __init print_efi_memmap(void)
384 {
385 efi_memory_desc_t *md;
386 void *p;
387 int i;
388
389 for (p = memmap.map, i = 0;
390 p < memmap.map_end;
391 p += memmap.desc_size, i++) {
392 md = p;
393 pr_info("mem%02u: type=%u, attr=0x%llx, "
394 "range=[0x%016llx-0x%016llx) (%lluMB)\n",
395 i, md->type, md->attribute, md->phys_addr,
396 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
397 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
398 }
399 }
400 #endif /* EFI_DEBUG */
401
402 void __init efi_reserve_boot_services(void)
403 {
404 void *p;
405
406 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
407 efi_memory_desc_t *md = p;
408 u64 start = md->phys_addr;
409 u64 size = md->num_pages << EFI_PAGE_SHIFT;
410
411 if (md->type != EFI_BOOT_SERVICES_CODE &&
412 md->type != EFI_BOOT_SERVICES_DATA)
413 continue;
414 /* Only reserve where possible:
415 * - Not within any already allocated areas
416 * - Not over any memory area (really needed, if above?)
417 * - Not within any part of the kernel
418 * - Not the bios reserved area
419 */
420 if ((start+size >= virt_to_phys(_text)
421 && start <= virt_to_phys(_end)) ||
422 !e820_all_mapped(start, start+size, E820_RAM) ||
423 memblock_is_region_reserved(start, size)) {
424 /* Could not reserve, skip it */
425 md->num_pages = 0;
426 memblock_dbg("Could not reserve boot range "
427 "[0x%010llx-0x%010llx]\n",
428 start, start+size-1);
429 } else
430 memblock_reserve(start, size);
431 }
432 }
433
434 void __init efi_unmap_memmap(void)
435 {
436 clear_bit(EFI_MEMMAP, &x86_efi_facility);
437 if (memmap.map) {
438 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
439 memmap.map = NULL;
440 }
441 }
442
443 void __init efi_free_boot_services(void)
444 {
445 void *p;
446
447 if (!efi_is_native())
448 return;
449
450 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
451 efi_memory_desc_t *md = p;
452 unsigned long long start = md->phys_addr;
453 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
454
455 if (md->type != EFI_BOOT_SERVICES_CODE &&
456 md->type != EFI_BOOT_SERVICES_DATA)
457 continue;
458
459 /* Could not reserve boot area */
460 if (!size)
461 continue;
462
463 free_bootmem_late(start, size);
464 }
465
466 efi_unmap_memmap();
467 }
468
469 static int __init efi_systab_init(void *phys)
470 {
471 if (efi_enabled(EFI_64BIT)) {
472 efi_system_table_64_t *systab64;
473 u64 tmp = 0;
474
475 systab64 = early_ioremap((unsigned long)phys,
476 sizeof(*systab64));
477 if (systab64 == NULL) {
478 pr_err("Couldn't map the system table!\n");
479 return -ENOMEM;
480 }
481
482 efi_systab.hdr = systab64->hdr;
483 efi_systab.fw_vendor = systab64->fw_vendor;
484 tmp |= systab64->fw_vendor;
485 efi_systab.fw_revision = systab64->fw_revision;
486 efi_systab.con_in_handle = systab64->con_in_handle;
487 tmp |= systab64->con_in_handle;
488 efi_systab.con_in = systab64->con_in;
489 tmp |= systab64->con_in;
490 efi_systab.con_out_handle = systab64->con_out_handle;
491 tmp |= systab64->con_out_handle;
492 efi_systab.con_out = systab64->con_out;
493 tmp |= systab64->con_out;
494 efi_systab.stderr_handle = systab64->stderr_handle;
495 tmp |= systab64->stderr_handle;
496 efi_systab.stderr = systab64->stderr;
497 tmp |= systab64->stderr;
498 efi_systab.runtime = (void *)(unsigned long)systab64->runtime;
499 tmp |= systab64->runtime;
500 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
501 tmp |= systab64->boottime;
502 efi_systab.nr_tables = systab64->nr_tables;
503 efi_systab.tables = systab64->tables;
504 tmp |= systab64->tables;
505
506 early_iounmap(systab64, sizeof(*systab64));
507 #ifdef CONFIG_X86_32
508 if (tmp >> 32) {
509 pr_err("EFI data located above 4GB, disabling EFI.\n");
510 return -EINVAL;
511 }
512 #endif
513 } else {
514 efi_system_table_32_t *systab32;
515
516 systab32 = early_ioremap((unsigned long)phys,
517 sizeof(*systab32));
518 if (systab32 == NULL) {
519 pr_err("Couldn't map the system table!\n");
520 return -ENOMEM;
521 }
522
523 efi_systab.hdr = systab32->hdr;
524 efi_systab.fw_vendor = systab32->fw_vendor;
525 efi_systab.fw_revision = systab32->fw_revision;
526 efi_systab.con_in_handle = systab32->con_in_handle;
527 efi_systab.con_in = systab32->con_in;
528 efi_systab.con_out_handle = systab32->con_out_handle;
529 efi_systab.con_out = systab32->con_out;
530 efi_systab.stderr_handle = systab32->stderr_handle;
531 efi_systab.stderr = systab32->stderr;
532 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
533 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
534 efi_systab.nr_tables = systab32->nr_tables;
535 efi_systab.tables = systab32->tables;
536
537 early_iounmap(systab32, sizeof(*systab32));
538 }
539
540 efi.systab = &efi_systab;
541
542 /*
543 * Verify the EFI Table
544 */
545 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
546 pr_err("System table signature incorrect!\n");
547 return -EINVAL;
548 }
549 if ((efi.systab->hdr.revision >> 16) == 0)
550 pr_err("Warning: System table version "
551 "%d.%02d, expected 1.00 or greater!\n",
552 efi.systab->hdr.revision >> 16,
553 efi.systab->hdr.revision & 0xffff);
554
555 return 0;
556 }
557
558 static int __init efi_config_init(u64 tables, int nr_tables)
559 {
560 void *config_tables, *tablep;
561 int i, sz;
562
563 if (efi_enabled(EFI_64BIT))
564 sz = sizeof(efi_config_table_64_t);
565 else
566 sz = sizeof(efi_config_table_32_t);
567
568 /*
569 * Let's see what config tables the firmware passed to us.
570 */
571 config_tables = early_ioremap(tables, nr_tables * sz);
572 if (config_tables == NULL) {
573 pr_err("Could not map Configuration table!\n");
574 return -ENOMEM;
575 }
576
577 tablep = config_tables;
578 pr_info("");
579 for (i = 0; i < efi.systab->nr_tables; i++) {
580 efi_guid_t guid;
581 unsigned long table;
582
583 if (efi_enabled(EFI_64BIT)) {
584 u64 table64;
585 guid = ((efi_config_table_64_t *)tablep)->guid;
586 table64 = ((efi_config_table_64_t *)tablep)->table;
587 table = table64;
588 #ifdef CONFIG_X86_32
589 if (table64 >> 32) {
590 pr_cont("\n");
591 pr_err("Table located above 4GB, disabling EFI.\n");
592 early_iounmap(config_tables,
593 efi.systab->nr_tables * sz);
594 return -EINVAL;
595 }
596 #endif
597 } else {
598 guid = ((efi_config_table_32_t *)tablep)->guid;
599 table = ((efi_config_table_32_t *)tablep)->table;
600 }
601 if (!efi_guidcmp(guid, MPS_TABLE_GUID)) {
602 efi.mps = table;
603 pr_cont(" MPS=0x%lx ", table);
604 } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) {
605 efi.acpi20 = table;
606 pr_cont(" ACPI 2.0=0x%lx ", table);
607 } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) {
608 efi.acpi = table;
609 pr_cont(" ACPI=0x%lx ", table);
610 } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) {
611 efi.smbios = table;
612 pr_cont(" SMBIOS=0x%lx ", table);
613 #ifdef CONFIG_X86_UV
614 } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) {
615 efi.uv_systab = table;
616 pr_cont(" UVsystab=0x%lx ", table);
617 #endif
618 } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) {
619 efi.hcdp = table;
620 pr_cont(" HCDP=0x%lx ", table);
621 } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) {
622 efi.uga = table;
623 pr_cont(" UGA=0x%lx ", table);
624 }
625 tablep += sz;
626 }
627 pr_cont("\n");
628 early_iounmap(config_tables, efi.systab->nr_tables * sz);
629 return 0;
630 }
631
632 static int __init efi_runtime_init(void)
633 {
634 efi_runtime_services_t *runtime;
635
636 /*
637 * Check out the runtime services table. We need to map
638 * the runtime services table so that we can grab the physical
639 * address of several of the EFI runtime functions, needed to
640 * set the firmware into virtual mode.
641 */
642 runtime = early_ioremap((unsigned long)efi.systab->runtime,
643 sizeof(efi_runtime_services_t));
644 if (!runtime) {
645 pr_err("Could not map the runtime service table!\n");
646 return -ENOMEM;
647 }
648 /*
649 * We will only need *early* access to the following
650 * two EFI runtime services before set_virtual_address_map
651 * is invoked.
652 */
653 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
654 efi_phys.set_virtual_address_map =
655 (efi_set_virtual_address_map_t *)
656 runtime->set_virtual_address_map;
657 /*
658 * Make efi_get_time can be called before entering
659 * virtual mode.
660 */
661 efi.get_time = phys_efi_get_time;
662 early_iounmap(runtime, sizeof(efi_runtime_services_t));
663
664 return 0;
665 }
666
667 static int __init efi_memmap_init(void)
668 {
669 /* Map the EFI memory map */
670 memmap.map = early_ioremap((unsigned long)memmap.phys_map,
671 memmap.nr_map * memmap.desc_size);
672 if (memmap.map == NULL) {
673 pr_err("Could not map the memory map!\n");
674 return -ENOMEM;
675 }
676 memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
677
678 if (add_efi_memmap)
679 do_add_efi_memmap();
680
681 return 0;
682 }
683
684 void __init efi_init(void)
685 {
686 efi_char16_t *c16;
687 char vendor[100] = "unknown";
688 int i = 0;
689 void *tmp;
690
691 #ifdef CONFIG_X86_32
692 if (boot_params.efi_info.efi_systab_hi ||
693 boot_params.efi_info.efi_memmap_hi) {
694 pr_info("Table located above 4GB, disabling EFI.\n");
695 return;
696 }
697 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
698 #else
699 efi_phys.systab = (efi_system_table_t *)
700 (boot_params.efi_info.efi_systab |
701 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
702 #endif
703
704 if (efi_systab_init(efi_phys.systab))
705 return;
706
707 set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility);
708
709 /*
710 * Show what we know for posterity
711 */
712 c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
713 if (c16) {
714 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
715 vendor[i] = *c16++;
716 vendor[i] = '\0';
717 } else
718 pr_err("Could not map the firmware vendor!\n");
719 early_iounmap(tmp, 2);
720
721 pr_info("EFI v%u.%.02u by %s\n",
722 efi.systab->hdr.revision >> 16,
723 efi.systab->hdr.revision & 0xffff, vendor);
724
725 if (efi_config_init(efi.systab->tables, efi.systab->nr_tables))
726 return;
727
728 set_bit(EFI_CONFIG_TABLES, &x86_efi_facility);
729
730 /*
731 * Note: We currently don't support runtime services on an EFI
732 * that doesn't match the kernel 32/64-bit mode.
733 */
734
735 if (!efi_is_native())
736 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
737 else {
738 if (disable_runtime || efi_runtime_init())
739 return;
740 set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility);
741 }
742
743 if (efi_memmap_init())
744 return;
745
746 set_bit(EFI_MEMMAP, &x86_efi_facility);
747
748 #ifdef CONFIG_X86_32
749 if (efi_is_native()) {
750 x86_platform.get_wallclock = efi_get_time;
751 x86_platform.set_wallclock = efi_set_rtc_mmss;
752 }
753 #endif
754
755 #if EFI_DEBUG
756 print_efi_memmap();
757 #endif
758 }
759
760 void __init efi_late_init(void)
761 {
762 efi_bgrt_init();
763 }
764
765 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
766 {
767 u64 addr, npages;
768
769 addr = md->virt_addr;
770 npages = md->num_pages;
771
772 memrange_efi_to_native(&addr, &npages);
773
774 if (executable)
775 set_memory_x(addr, npages);
776 else
777 set_memory_nx(addr, npages);
778 }
779
780 static void __init runtime_code_page_mkexec(void)
781 {
782 efi_memory_desc_t *md;
783 void *p;
784
785 /* Make EFI runtime service code area executable */
786 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
787 md = p;
788
789 if (md->type != EFI_RUNTIME_SERVICES_CODE)
790 continue;
791
792 efi_set_executable(md, true);
793 }
794 }
795
796 /*
797 * We can't ioremap data in EFI boot services RAM, because we've already mapped
798 * it as RAM. So, look it up in the existing EFI memory map instead. Only
799 * callable after efi_enter_virtual_mode and before efi_free_boot_services.
800 */
801 void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
802 {
803 void *p;
804 if (WARN_ON(!memmap.map))
805 return NULL;
806 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
807 efi_memory_desc_t *md = p;
808 u64 size = md->num_pages << EFI_PAGE_SHIFT;
809 u64 end = md->phys_addr + size;
810 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
811 md->type != EFI_BOOT_SERVICES_CODE &&
812 md->type != EFI_BOOT_SERVICES_DATA)
813 continue;
814 if (!md->virt_addr)
815 continue;
816 if (phys_addr >= md->phys_addr && phys_addr < end) {
817 phys_addr += md->virt_addr - md->phys_addr;
818 return (__force void __iomem *)(unsigned long)phys_addr;
819 }
820 }
821 return NULL;
822 }
823
824 void efi_memory_uc(u64 addr, unsigned long size)
825 {
826 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
827 u64 npages;
828
829 npages = round_up(size, page_shift) / page_shift;
830 memrange_efi_to_native(&addr, &npages);
831 set_memory_uc(addr, npages);
832 }
833
834 /*
835 * This function will switch the EFI runtime services to virtual mode.
836 * Essentially, look through the EFI memmap and map every region that
837 * has the runtime attribute bit set in its memory descriptor and update
838 * that memory descriptor with the virtual address obtained from ioremap().
839 * This enables the runtime services to be called without having to
840 * thunk back into physical mode for every invocation.
841 */
842 void __init efi_enter_virtual_mode(void)
843 {
844 efi_memory_desc_t *md, *prev_md = NULL;
845 efi_status_t status;
846 unsigned long size;
847 u64 end, systab, end_pfn;
848 void *p, *va, *new_memmap = NULL;
849 int count = 0;
850
851 efi.systab = NULL;
852
853 /*
854 * We don't do virtual mode, since we don't do runtime services, on
855 * non-native EFI
856 */
857
858 if (!efi_is_native()) {
859 efi_unmap_memmap();
860 return;
861 }
862
863 /* Merge contiguous regions of the same type and attribute */
864 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
865 u64 prev_size;
866 md = p;
867
868 if (!prev_md) {
869 prev_md = md;
870 continue;
871 }
872
873 if (prev_md->type != md->type ||
874 prev_md->attribute != md->attribute) {
875 prev_md = md;
876 continue;
877 }
878
879 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
880
881 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
882 prev_md->num_pages += md->num_pages;
883 md->type = EFI_RESERVED_TYPE;
884 md->attribute = 0;
885 continue;
886 }
887 prev_md = md;
888 }
889
890 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
891 md = p;
892 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
893 md->type != EFI_BOOT_SERVICES_CODE &&
894 md->type != EFI_BOOT_SERVICES_DATA)
895 continue;
896
897 size = md->num_pages << EFI_PAGE_SHIFT;
898 end = md->phys_addr + size;
899
900 end_pfn = PFN_UP(end);
901 if (end_pfn <= max_low_pfn_mapped
902 || (end_pfn > (1UL << (32 - PAGE_SHIFT))
903 && end_pfn <= max_pfn_mapped)) {
904 va = __va(md->phys_addr);
905
906 if (!(md->attribute & EFI_MEMORY_WB))
907 efi_memory_uc((u64)(unsigned long)va, size);
908 } else
909 va = efi_ioremap(md->phys_addr, size,
910 md->type, md->attribute);
911
912 md->virt_addr = (u64) (unsigned long) va;
913
914 if (!va) {
915 pr_err("ioremap of 0x%llX failed!\n",
916 (unsigned long long)md->phys_addr);
917 continue;
918 }
919
920 systab = (u64) (unsigned long) efi_phys.systab;
921 if (md->phys_addr <= systab && systab < end) {
922 systab += md->virt_addr - md->phys_addr;
923 efi.systab = (efi_system_table_t *) (unsigned long) systab;
924 }
925 new_memmap = krealloc(new_memmap,
926 (count + 1) * memmap.desc_size,
927 GFP_KERNEL);
928 memcpy(new_memmap + (count * memmap.desc_size), md,
929 memmap.desc_size);
930 count++;
931 }
932
933 BUG_ON(!efi.systab);
934
935 status = phys_efi_set_virtual_address_map(
936 memmap.desc_size * count,
937 memmap.desc_size,
938 memmap.desc_version,
939 (efi_memory_desc_t *)__pa(new_memmap));
940
941 if (status != EFI_SUCCESS) {
942 pr_alert("Unable to switch EFI into virtual mode "
943 "(status=%lx)!\n", status);
944 panic("EFI call to SetVirtualAddressMap() failed!");
945 }
946
947 /*
948 * Now that EFI is in virtual mode, update the function
949 * pointers in the runtime service table to the new virtual addresses.
950 *
951 * Call EFI services through wrapper functions.
952 */
953 efi.runtime_version = efi_systab.hdr.revision;
954 efi.get_time = virt_efi_get_time;
955 efi.set_time = virt_efi_set_time;
956 efi.get_wakeup_time = virt_efi_get_wakeup_time;
957 efi.set_wakeup_time = virt_efi_set_wakeup_time;
958 efi.get_variable = virt_efi_get_variable;
959 efi.get_next_variable = virt_efi_get_next_variable;
960 efi.set_variable = virt_efi_set_variable;
961 efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
962 efi.reset_system = virt_efi_reset_system;
963 efi.set_virtual_address_map = NULL;
964 efi.query_variable_info = virt_efi_query_variable_info;
965 efi.update_capsule = virt_efi_update_capsule;
966 efi.query_capsule_caps = virt_efi_query_capsule_caps;
967 if (__supported_pte_mask & _PAGE_NX)
968 runtime_code_page_mkexec();
969
970 kfree(new_memmap);
971 }
972
973 /*
974 * Convenience functions to obtain memory types and attributes
975 */
976 u32 efi_mem_type(unsigned long phys_addr)
977 {
978 efi_memory_desc_t *md;
979 void *p;
980
981 if (!efi_enabled(EFI_MEMMAP))
982 return 0;
983
984 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
985 md = p;
986 if ((md->phys_addr <= phys_addr) &&
987 (phys_addr < (md->phys_addr +
988 (md->num_pages << EFI_PAGE_SHIFT))))
989 return md->type;
990 }
991 return 0;
992 }
993
994 u64 efi_mem_attributes(unsigned long phys_addr)
995 {
996 efi_memory_desc_t *md;
997 void *p;
998
999 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1000 md = p;
1001 if ((md->phys_addr <= phys_addr) &&
1002 (phys_addr < (md->phys_addr +
1003 (md->num_pages << EFI_PAGE_SHIFT))))
1004 return md->attribute;
1005 }
1006 return 0;
1007 }
Linux kernel - Deliverables
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