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x86/efi: Do not export efi runtime map in case old map
[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 * Copyright (C) 2013 SuSE Labs
16 * Borislav Petkov <bp@suse.de> - runtime services VA mapping
17 *
18 * Copied from efi_32.c to eliminate the duplicated code between EFI
19 * 32/64 support code. --ying 2007-10-26
20 *
21 * All EFI Runtime Services are not implemented yet as EFI only
22 * supports physical mode addressing on SoftSDV. This is to be fixed
23 * in a future version. --drummond 1999-07-20
24 *
25 * Implemented EFI runtime services and virtual mode calls. --davidm
26 *
27 * Goutham Rao: <goutham.rao@intel.com>
28 * Skip non-WB memory and ignore empty memory ranges.
29 */
30
31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32
33 #include <linux/kernel.h>
34 #include <linux/init.h>
35 #include <linux/efi.h>
36 #include <linux/efi-bgrt.h>
37 #include <linux/export.h>
38 #include <linux/bootmem.h>
39 #include <linux/slab.h>
40 #include <linux/memblock.h>
41 #include <linux/spinlock.h>
42 #include <linux/uaccess.h>
43 #include <linux/time.h>
44 #include <linux/io.h>
45 #include <linux/reboot.h>
46 #include <linux/bcd.h>
47
48 #include <asm/setup.h>
49 #include <asm/efi.h>
50 #include <asm/time.h>
51 #include <asm/cacheflush.h>
52 #include <asm/tlbflush.h>
53 #include <asm/x86_init.h>
54 #include <asm/rtc.h>
55 #include <asm/uv/uv.h>
56
57 #define EFI_DEBUG
58
59 #define EFI_MIN_RESERVE 5120
60
61 #define EFI_DUMMY_GUID \
62 EFI_GUID(0x4424ac57, 0xbe4b, 0x47dd, 0x9e, 0x97, 0xed, 0x50, 0xf0, 0x9f, 0x92, 0xa9)
63
64 static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 };
65
66 struct efi_memory_map memmap;
67
68 static struct efi efi_phys __initdata;
69 static efi_system_table_t efi_systab __initdata;
70
71 static efi_config_table_type_t arch_tables[] __initdata = {
72 #ifdef CONFIG_X86_UV
73 {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab},
74 #endif
75 {NULL_GUID, NULL, NULL},
76 };
77
78 u64 efi_setup; /* efi setup_data physical address */
79
80 static bool disable_runtime __initdata = false;
81 static int __init setup_noefi(char *arg)
82 {
83 disable_runtime = true;
84 return 0;
85 }
86 early_param("noefi", setup_noefi);
87
88 int add_efi_memmap;
89 EXPORT_SYMBOL(add_efi_memmap);
90
91 static int __init setup_add_efi_memmap(char *arg)
92 {
93 add_efi_memmap = 1;
94 return 0;
95 }
96 early_param("add_efi_memmap", setup_add_efi_memmap);
97
98 static bool efi_no_storage_paranoia;
99
100 static int __init setup_storage_paranoia(char *arg)
101 {
102 efi_no_storage_paranoia = true;
103 return 0;
104 }
105 early_param("efi_no_storage_paranoia", setup_storage_paranoia);
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 int efi_set_rtc_mmss(const struct timespec *now)
250 {
251 unsigned long nowtime = now->tv_sec;
252 efi_status_t status;
253 efi_time_t eft;
254 efi_time_cap_t cap;
255 struct rtc_time tm;
256
257 status = efi.get_time(&eft, &cap);
258 if (status != EFI_SUCCESS) {
259 pr_err("Oops: efitime: can't read time!\n");
260 return -1;
261 }
262
263 rtc_time_to_tm(nowtime, &tm);
264 if (!rtc_valid_tm(&tm)) {
265 eft.year = tm.tm_year + 1900;
266 eft.month = tm.tm_mon + 1;
267 eft.day = tm.tm_mday;
268 eft.minute = tm.tm_min;
269 eft.second = tm.tm_sec;
270 eft.nanosecond = 0;
271 } else {
272 pr_err("%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n",
273 __func__, nowtime);
274 return -1;
275 }
276
277 status = efi.set_time(&eft);
278 if (status != EFI_SUCCESS) {
279 pr_err("Oops: efitime: can't write time!\n");
280 return -1;
281 }
282 return 0;
283 }
284
285 void efi_get_time(struct timespec *now)
286 {
287 efi_status_t status;
288 efi_time_t eft;
289 efi_time_cap_t cap;
290
291 status = efi.get_time(&eft, &cap);
292 if (status != EFI_SUCCESS)
293 pr_err("Oops: efitime: can't read time!\n");
294
295 now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour,
296 eft.minute, eft.second);
297 now->tv_nsec = 0;
298 }
299
300 /*
301 * Tell the kernel about the EFI memory map. This might include
302 * more than the max 128 entries that can fit in the e820 legacy
303 * (zeropage) memory map.
304 */
305
306 static void __init do_add_efi_memmap(void)
307 {
308 void *p;
309
310 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
311 efi_memory_desc_t *md = p;
312 unsigned long long start = md->phys_addr;
313 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
314 int e820_type;
315
316 switch (md->type) {
317 case EFI_LOADER_CODE:
318 case EFI_LOADER_DATA:
319 case EFI_BOOT_SERVICES_CODE:
320 case EFI_BOOT_SERVICES_DATA:
321 case EFI_CONVENTIONAL_MEMORY:
322 if (md->attribute & EFI_MEMORY_WB)
323 e820_type = E820_RAM;
324 else
325 e820_type = E820_RESERVED;
326 break;
327 case EFI_ACPI_RECLAIM_MEMORY:
328 e820_type = E820_ACPI;
329 break;
330 case EFI_ACPI_MEMORY_NVS:
331 e820_type = E820_NVS;
332 break;
333 case EFI_UNUSABLE_MEMORY:
334 e820_type = E820_UNUSABLE;
335 break;
336 default:
337 /*
338 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
339 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
340 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
341 */
342 e820_type = E820_RESERVED;
343 break;
344 }
345 e820_add_region(start, size, e820_type);
346 }
347 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
348 }
349
350 int __init efi_memblock_x86_reserve_range(void)
351 {
352 struct efi_info *e = &boot_params.efi_info;
353 unsigned long pmap;
354
355 #ifdef CONFIG_X86_32
356 /* Can't handle data above 4GB at this time */
357 if (e->efi_memmap_hi) {
358 pr_err("Memory map is above 4GB, disabling EFI.\n");
359 return -EINVAL;
360 }
361 pmap = e->efi_memmap;
362 #else
363 pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
364 #endif
365 memmap.phys_map = (void *)pmap;
366 memmap.nr_map = e->efi_memmap_size /
367 e->efi_memdesc_size;
368 memmap.desc_size = e->efi_memdesc_size;
369 memmap.desc_version = e->efi_memdesc_version;
370
371 memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
372
373 efi.memmap = &memmap;
374
375 return 0;
376 }
377
378 static void __init print_efi_memmap(void)
379 {
380 #ifdef EFI_DEBUG
381 efi_memory_desc_t *md;
382 void *p;
383 int i;
384
385 for (p = memmap.map, i = 0;
386 p < memmap.map_end;
387 p += memmap.desc_size, i++) {
388 md = p;
389 pr_info("mem%02u: type=%u, attr=0x%llx, range=[0x%016llx-0x%016llx) (%lluMB)\n",
390 i, md->type, md->attribute, md->phys_addr,
391 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
392 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
393 }
394 #endif /* EFI_DEBUG */
395 }
396
397 void __init efi_reserve_boot_services(void)
398 {
399 void *p;
400
401 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
402 efi_memory_desc_t *md = p;
403 u64 start = md->phys_addr;
404 u64 size = md->num_pages << EFI_PAGE_SHIFT;
405
406 if (md->type != EFI_BOOT_SERVICES_CODE &&
407 md->type != EFI_BOOT_SERVICES_DATA)
408 continue;
409 /* Only reserve where possible:
410 * - Not within any already allocated areas
411 * - Not over any memory area (really needed, if above?)
412 * - Not within any part of the kernel
413 * - Not the bios reserved area
414 */
415 if ((start + size > __pa_symbol(_text)
416 && start <= __pa_symbol(_end)) ||
417 !e820_all_mapped(start, start+size, E820_RAM) ||
418 memblock_is_region_reserved(start, size)) {
419 /* Could not reserve, skip it */
420 md->num_pages = 0;
421 memblock_dbg("Could not reserve boot range [0x%010llx-0x%010llx]\n",
422 start, start+size-1);
423 } else
424 memblock_reserve(start, size);
425 }
426 }
427
428 void __init efi_unmap_memmap(void)
429 {
430 clear_bit(EFI_MEMMAP, &efi.flags);
431 if (memmap.map) {
432 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
433 memmap.map = NULL;
434 }
435 }
436
437 void __init efi_free_boot_services(void)
438 {
439 void *p;
440
441 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
442 efi_memory_desc_t *md = p;
443 unsigned long long start = md->phys_addr;
444 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
445
446 if (md->type != EFI_BOOT_SERVICES_CODE &&
447 md->type != EFI_BOOT_SERVICES_DATA)
448 continue;
449
450 /* Could not reserve boot area */
451 if (!size)
452 continue;
453
454 free_bootmem_late(start, size);
455 }
456
457 efi_unmap_memmap();
458 }
459
460 static int __init efi_systab_init(void *phys)
461 {
462 if (efi_enabled(EFI_64BIT)) {
463 efi_system_table_64_t *systab64;
464 struct efi_setup_data *data = NULL;
465 u64 tmp = 0;
466
467 if (efi_setup) {
468 data = early_memremap(efi_setup, sizeof(*data));
469 if (!data)
470 return -ENOMEM;
471 }
472 systab64 = early_ioremap((unsigned long)phys,
473 sizeof(*systab64));
474 if (systab64 == NULL) {
475 pr_err("Couldn't map the system table!\n");
476 if (data)
477 early_iounmap(data, sizeof(*data));
478 return -ENOMEM;
479 }
480
481 efi_systab.hdr = systab64->hdr;
482 efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor :
483 systab64->fw_vendor;
484 tmp |= data ? data->fw_vendor : 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 = data ?
499 (void *)(unsigned long)data->runtime :
500 (void *)(unsigned long)systab64->runtime;
501 tmp |= data ? data->runtime : systab64->runtime;
502 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
503 tmp |= systab64->boottime;
504 efi_systab.nr_tables = systab64->nr_tables;
505 efi_systab.tables = data ? (unsigned long)data->tables :
506 systab64->tables;
507 tmp |= data ? data->tables : systab64->tables;
508
509 early_iounmap(systab64, sizeof(*systab64));
510 if (data)
511 early_iounmap(data, sizeof(*data));
512 #ifdef CONFIG_X86_32
513 if (tmp >> 32) {
514 pr_err("EFI data located above 4GB, disabling EFI.\n");
515 return -EINVAL;
516 }
517 #endif
518 } else {
519 efi_system_table_32_t *systab32;
520
521 systab32 = early_ioremap((unsigned long)phys,
522 sizeof(*systab32));
523 if (systab32 == NULL) {
524 pr_err("Couldn't map the system table!\n");
525 return -ENOMEM;
526 }
527
528 efi_systab.hdr = systab32->hdr;
529 efi_systab.fw_vendor = systab32->fw_vendor;
530 efi_systab.fw_revision = systab32->fw_revision;
531 efi_systab.con_in_handle = systab32->con_in_handle;
532 efi_systab.con_in = systab32->con_in;
533 efi_systab.con_out_handle = systab32->con_out_handle;
534 efi_systab.con_out = systab32->con_out;
535 efi_systab.stderr_handle = systab32->stderr_handle;
536 efi_systab.stderr = systab32->stderr;
537 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
538 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
539 efi_systab.nr_tables = systab32->nr_tables;
540 efi_systab.tables = systab32->tables;
541
542 early_iounmap(systab32, sizeof(*systab32));
543 }
544
545 efi.systab = &efi_systab;
546
547 /*
548 * Verify the EFI Table
549 */
550 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
551 pr_err("System table signature incorrect!\n");
552 return -EINVAL;
553 }
554 if ((efi.systab->hdr.revision >> 16) == 0)
555 pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n",
556 efi.systab->hdr.revision >> 16,
557 efi.systab->hdr.revision & 0xffff);
558
559 set_bit(EFI_SYSTEM_TABLES, &efi.flags);
560
561 return 0;
562 }
563
564 static int __init efi_runtime_init32(void)
565 {
566 efi_runtime_services_32_t *runtime;
567
568 runtime = early_ioremap((unsigned long)efi.systab->runtime,
569 sizeof(efi_runtime_services_32_t));
570 if (!runtime) {
571 pr_err("Could not map the runtime service table!\n");
572 return -ENOMEM;
573 }
574
575 /*
576 * We will only need *early* access to the following two
577 * EFI runtime services before set_virtual_address_map
578 * is invoked.
579 */
580 efi_phys.set_virtual_address_map =
581 (efi_set_virtual_address_map_t *)
582 (unsigned long)runtime->set_virtual_address_map;
583 early_iounmap(runtime, sizeof(efi_runtime_services_32_t));
584
585 return 0;
586 }
587
588 static int __init efi_runtime_init64(void)
589 {
590 efi_runtime_services_64_t *runtime;
591
592 runtime = early_ioremap((unsigned long)efi.systab->runtime,
593 sizeof(efi_runtime_services_64_t));
594 if (!runtime) {
595 pr_err("Could not map the runtime service table!\n");
596 return -ENOMEM;
597 }
598
599 /*
600 * We will only need *early* access to the following two
601 * EFI runtime services before set_virtual_address_map
602 * is invoked.
603 */
604 efi_phys.set_virtual_address_map =
605 (efi_set_virtual_address_map_t *)
606 (unsigned long)runtime->set_virtual_address_map;
607 early_iounmap(runtime, sizeof(efi_runtime_services_64_t));
608
609 return 0;
610 }
611
612 static int __init efi_runtime_init(void)
613 {
614 int rv;
615
616 /*
617 * Check out the runtime services table. We need to map
618 * the runtime services table so that we can grab the physical
619 * address of several of the EFI runtime functions, needed to
620 * set the firmware into virtual mode.
621 */
622 if (efi_enabled(EFI_64BIT))
623 rv = efi_runtime_init64();
624 else
625 rv = efi_runtime_init32();
626
627 if (rv)
628 return rv;
629
630 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
631
632 return 0;
633 }
634
635 static int __init efi_memmap_init(void)
636 {
637 /* Map the EFI memory map */
638 memmap.map = early_ioremap((unsigned long)memmap.phys_map,
639 memmap.nr_map * memmap.desc_size);
640 if (memmap.map == NULL) {
641 pr_err("Could not map the memory map!\n");
642 return -ENOMEM;
643 }
644 memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
645
646 if (add_efi_memmap)
647 do_add_efi_memmap();
648
649 set_bit(EFI_MEMMAP, &efi.flags);
650
651 return 0;
652 }
653
654 /*
655 * A number of config table entries get remapped to virtual addresses
656 * after entering EFI virtual mode. However, the kexec kernel requires
657 * their physical addresses therefore we pass them via setup_data and
658 * correct those entries to their respective physical addresses here.
659 *
660 * Currently only handles smbios which is necessary for some firmware
661 * implementation.
662 */
663 static int __init efi_reuse_config(u64 tables, int nr_tables)
664 {
665 int i, sz, ret = 0;
666 void *p, *tablep;
667 struct efi_setup_data *data;
668
669 if (!efi_setup)
670 return 0;
671
672 if (!efi_enabled(EFI_64BIT))
673 return 0;
674
675 data = early_memremap(efi_setup, sizeof(*data));
676 if (!data) {
677 ret = -ENOMEM;
678 goto out;
679 }
680
681 if (!data->smbios)
682 goto out_memremap;
683
684 sz = sizeof(efi_config_table_64_t);
685
686 p = tablep = early_memremap(tables, nr_tables * sz);
687 if (!p) {
688 pr_err("Could not map Configuration table!\n");
689 ret = -ENOMEM;
690 goto out_memremap;
691 }
692
693 for (i = 0; i < efi.systab->nr_tables; i++) {
694 efi_guid_t guid;
695
696 guid = ((efi_config_table_64_t *)p)->guid;
697
698 if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID))
699 ((efi_config_table_64_t *)p)->table = data->smbios;
700 p += sz;
701 }
702 early_iounmap(tablep, nr_tables * sz);
703
704 out_memremap:
705 early_iounmap(data, sizeof(*data));
706 out:
707 return ret;
708 }
709
710 void __init efi_init(void)
711 {
712 efi_char16_t *c16;
713 char vendor[100] = "unknown";
714 int i = 0;
715 void *tmp;
716
717 #ifdef CONFIG_X86_32
718 if (boot_params.efi_info.efi_systab_hi ||
719 boot_params.efi_info.efi_memmap_hi) {
720 pr_info("Table located above 4GB, disabling EFI.\n");
721 return;
722 }
723 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
724 #else
725 efi_phys.systab = (efi_system_table_t *)
726 (boot_params.efi_info.efi_systab |
727 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
728 #endif
729
730 if (efi_systab_init(efi_phys.systab))
731 return;
732
733 set_bit(EFI_SYSTEM_TABLES, &efi.flags);
734
735 efi.config_table = (unsigned long)efi.systab->tables;
736 efi.fw_vendor = (unsigned long)efi.systab->fw_vendor;
737 efi.runtime = (unsigned long)efi.systab->runtime;
738
739 /*
740 * Show what we know for posterity
741 */
742 c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
743 if (c16) {
744 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
745 vendor[i] = *c16++;
746 vendor[i] = '\0';
747 } else
748 pr_err("Could not map the firmware vendor!\n");
749 early_iounmap(tmp, 2);
750
751 pr_info("EFI v%u.%.02u by %s\n",
752 efi.systab->hdr.revision >> 16,
753 efi.systab->hdr.revision & 0xffff, vendor);
754
755 if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables))
756 return;
757
758 if (efi_config_init(arch_tables))
759 return;
760
761 /*
762 * Note: We currently don't support runtime services on an EFI
763 * that doesn't match the kernel 32/64-bit mode.
764 */
765
766 if (!efi_runtime_supported())
767 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
768 else {
769 if (disable_runtime || efi_runtime_init())
770 return;
771 }
772 if (efi_memmap_init())
773 return;
774
775 set_bit(EFI_MEMMAP, &efi.flags);
776
777 print_efi_memmap();
778 }
779
780 void __init efi_late_init(void)
781 {
782 efi_bgrt_init();
783 }
784
785 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
786 {
787 u64 addr, npages;
788
789 addr = md->virt_addr;
790 npages = md->num_pages;
791
792 memrange_efi_to_native(&addr, &npages);
793
794 if (executable)
795 set_memory_x(addr, npages);
796 else
797 set_memory_nx(addr, npages);
798 }
799
800 void __init runtime_code_page_mkexec(void)
801 {
802 efi_memory_desc_t *md;
803 void *p;
804
805 /* Make EFI runtime service code area executable */
806 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
807 md = p;
808
809 if (md->type != EFI_RUNTIME_SERVICES_CODE)
810 continue;
811
812 efi_set_executable(md, true);
813 }
814 }
815
816 void efi_memory_uc(u64 addr, unsigned long size)
817 {
818 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
819 u64 npages;
820
821 npages = round_up(size, page_shift) / page_shift;
822 memrange_efi_to_native(&addr, &npages);
823 set_memory_uc(addr, npages);
824 }
825
826 void __init old_map_region(efi_memory_desc_t *md)
827 {
828 u64 start_pfn, end_pfn, end;
829 unsigned long size;
830 void *va;
831
832 start_pfn = PFN_DOWN(md->phys_addr);
833 size = md->num_pages << PAGE_SHIFT;
834 end = md->phys_addr + size;
835 end_pfn = PFN_UP(end);
836
837 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
838 va = __va(md->phys_addr);
839
840 if (!(md->attribute & EFI_MEMORY_WB))
841 efi_memory_uc((u64)(unsigned long)va, size);
842 } else
843 va = efi_ioremap(md->phys_addr, size,
844 md->type, md->attribute);
845
846 md->virt_addr = (u64) (unsigned long) va;
847 if (!va)
848 pr_err("ioremap of 0x%llX failed!\n",
849 (unsigned long long)md->phys_addr);
850 }
851
852 static void native_runtime_setup(void)
853 {
854 efi.get_time = virt_efi_get_time;
855 efi.set_time = virt_efi_set_time;
856 efi.get_wakeup_time = virt_efi_get_wakeup_time;
857 efi.set_wakeup_time = virt_efi_set_wakeup_time;
858 efi.get_variable = virt_efi_get_variable;
859 efi.get_next_variable = virt_efi_get_next_variable;
860 efi.set_variable = virt_efi_set_variable;
861 efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
862 efi.reset_system = virt_efi_reset_system;
863 efi.query_variable_info = virt_efi_query_variable_info;
864 efi.update_capsule = virt_efi_update_capsule;
865 efi.query_capsule_caps = virt_efi_query_capsule_caps;
866 }
867
868 /* Merge contiguous regions of the same type and attribute */
869 static void __init efi_merge_regions(void)
870 {
871 void *p;
872 efi_memory_desc_t *md, *prev_md = NULL;
873
874 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
875 u64 prev_size;
876 md = p;
877
878 if (!prev_md) {
879 prev_md = md;
880 continue;
881 }
882
883 if (prev_md->type != md->type ||
884 prev_md->attribute != md->attribute) {
885 prev_md = md;
886 continue;
887 }
888
889 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
890
891 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
892 prev_md->num_pages += md->num_pages;
893 md->type = EFI_RESERVED_TYPE;
894 md->attribute = 0;
895 continue;
896 }
897 prev_md = md;
898 }
899 }
900
901 static void __init get_systab_virt_addr(efi_memory_desc_t *md)
902 {
903 unsigned long size;
904 u64 end, systab;
905
906 size = md->num_pages << EFI_PAGE_SHIFT;
907 end = md->phys_addr + size;
908 systab = (u64)(unsigned long)efi_phys.systab;
909 if (md->phys_addr <= systab && systab < end) {
910 systab += md->virt_addr - md->phys_addr;
911 efi.systab = (efi_system_table_t *)(unsigned long)systab;
912 }
913 }
914
915 static void __init save_runtime_map(void)
916 {
917 #ifdef CONFIG_KEXEC
918 efi_memory_desc_t *md;
919 void *tmp, *p, *q = NULL;
920 int count = 0;
921
922 if (efi_enabled(EFI_OLD_MEMMAP))
923 return;
924
925 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
926 md = p;
927
928 if (!(md->attribute & EFI_MEMORY_RUNTIME) ||
929 (md->type == EFI_BOOT_SERVICES_CODE) ||
930 (md->type == EFI_BOOT_SERVICES_DATA))
931 continue;
932 tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL);
933 if (!tmp)
934 goto out;
935 q = tmp;
936
937 memcpy(q + count * memmap.desc_size, md, memmap.desc_size);
938 count++;
939 }
940
941 efi_runtime_map_setup(q, count, memmap.desc_size);
942 return;
943
944 out:
945 kfree(q);
946 pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
947 #endif
948 }
949
950 static void *realloc_pages(void *old_memmap, int old_shift)
951 {
952 void *ret;
953
954 ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
955 if (!ret)
956 goto out;
957
958 /*
959 * A first-time allocation doesn't have anything to copy.
960 */
961 if (!old_memmap)
962 return ret;
963
964 memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
965
966 out:
967 free_pages((unsigned long)old_memmap, old_shift);
968 return ret;
969 }
970
971 /*
972 * Map the efi memory ranges of the runtime services and update new_mmap with
973 * virtual addresses.
974 */
975 static void * __init efi_map_regions(int *count, int *pg_shift)
976 {
977 void *p, *new_memmap = NULL;
978 unsigned long left = 0;
979 efi_memory_desc_t *md;
980
981 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
982 md = p;
983 if (!(md->attribute & EFI_MEMORY_RUNTIME)) {
984 #ifdef CONFIG_X86_64
985 if (md->type != EFI_BOOT_SERVICES_CODE &&
986 md->type != EFI_BOOT_SERVICES_DATA)
987 #endif
988 continue;
989 }
990
991 efi_map_region(md);
992 get_systab_virt_addr(md);
993
994 if (left < memmap.desc_size) {
995 new_memmap = realloc_pages(new_memmap, *pg_shift);
996 if (!new_memmap)
997 return NULL;
998
999 left += PAGE_SIZE << *pg_shift;
1000 (*pg_shift)++;
1001 }
1002
1003 memcpy(new_memmap + (*count * memmap.desc_size), md,
1004 memmap.desc_size);
1005
1006 left -= memmap.desc_size;
1007 (*count)++;
1008 }
1009
1010 return new_memmap;
1011 }
1012
1013 static void __init kexec_enter_virtual_mode(void)
1014 {
1015 #ifdef CONFIG_KEXEC
1016 efi_memory_desc_t *md;
1017 void *p;
1018
1019 efi.systab = NULL;
1020
1021 /*
1022 * We don't do virtual mode, since we don't do runtime services, on
1023 * non-native EFI
1024 */
1025 if (!efi_is_native()) {
1026 efi_unmap_memmap();
1027 return;
1028 }
1029
1030 /*
1031 * Map efi regions which were passed via setup_data. The virt_addr is a
1032 * fixed addr which was used in first kernel of a kexec boot.
1033 */
1034 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1035 md = p;
1036 efi_map_region_fixed(md); /* FIXME: add error handling */
1037 get_systab_virt_addr(md);
1038 }
1039
1040 save_runtime_map();
1041
1042 BUG_ON(!efi.systab);
1043
1044 efi_sync_low_kernel_mappings();
1045
1046 /*
1047 * Now that EFI is in virtual mode, update the function
1048 * pointers in the runtime service table to the new virtual addresses.
1049 *
1050 * Call EFI services through wrapper functions.
1051 */
1052 efi.runtime_version = efi_systab.hdr.revision;
1053
1054 native_runtime_setup();
1055
1056 efi.set_virtual_address_map = NULL;
1057
1058 if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
1059 runtime_code_page_mkexec();
1060
1061 /* clean DUMMY object */
1062 efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1063 EFI_VARIABLE_NON_VOLATILE |
1064 EFI_VARIABLE_BOOTSERVICE_ACCESS |
1065 EFI_VARIABLE_RUNTIME_ACCESS,
1066 0, NULL);
1067 #endif
1068 }
1069
1070 /*
1071 * This function will switch the EFI runtime services to virtual mode.
1072 * Essentially, we look through the EFI memmap and map every region that
1073 * has the runtime attribute bit set in its memory descriptor into the
1074 * ->trampoline_pgd page table using a top-down VA allocation scheme.
1075 *
1076 * The old method which used to update that memory descriptor with the
1077 * virtual address obtained from ioremap() is still supported when the
1078 * kernel is booted with efi=old_map on its command line. Same old
1079 * method enabled the runtime services to be called without having to
1080 * thunk back into physical mode for every invocation.
1081 *
1082 * The new method does a pagetable switch in a preemption-safe manner
1083 * so that we're in a different address space when calling a runtime
1084 * function. For function arguments passing we do copy the PGDs of the
1085 * kernel page table into ->trampoline_pgd prior to each call.
1086 *
1087 * Specially for kexec boot, efi runtime maps in previous kernel should
1088 * be passed in via setup_data. In that case runtime ranges will be mapped
1089 * to the same virtual addresses as the first kernel, see
1090 * kexec_enter_virtual_mode().
1091 */
1092 static void __init __efi_enter_virtual_mode(void)
1093 {
1094 int count = 0, pg_shift = 0;
1095 void *new_memmap = NULL;
1096 efi_status_t status;
1097
1098 efi.systab = NULL;
1099
1100 efi_merge_regions();
1101 new_memmap = efi_map_regions(&count, &pg_shift);
1102 if (!new_memmap) {
1103 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
1104 return;
1105 }
1106
1107 save_runtime_map();
1108
1109 BUG_ON(!efi.systab);
1110
1111 if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift))
1112 return;
1113
1114 efi_sync_low_kernel_mappings();
1115 efi_dump_pagetable();
1116
1117 if (efi_is_native()) {
1118 status = phys_efi_set_virtual_address_map(
1119 memmap.desc_size * count,
1120 memmap.desc_size,
1121 memmap.desc_version,
1122 (efi_memory_desc_t *)__pa(new_memmap));
1123 } else {
1124 status = efi_thunk_set_virtual_address_map(
1125 efi_phys.set_virtual_address_map,
1126 memmap.desc_size * count,
1127 memmap.desc_size,
1128 memmap.desc_version,
1129 (efi_memory_desc_t *)__pa(new_memmap));
1130 }
1131
1132 if (status != EFI_SUCCESS) {
1133 pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
1134 status);
1135 panic("EFI call to SetVirtualAddressMap() failed!");
1136 }
1137
1138 /*
1139 * Now that EFI is in virtual mode, update the function
1140 * pointers in the runtime service table to the new virtual addresses.
1141 *
1142 * Call EFI services through wrapper functions.
1143 */
1144 efi.runtime_version = efi_systab.hdr.revision;
1145
1146 if (efi_is_native())
1147 native_runtime_setup();
1148 else
1149 efi_thunk_runtime_setup();
1150
1151 efi.set_virtual_address_map = NULL;
1152
1153 efi_runtime_mkexec();
1154
1155 /*
1156 * We mapped the descriptor array into the EFI pagetable above but we're
1157 * not unmapping it here. Here's why:
1158 *
1159 * We're copying select PGDs from the kernel page table to the EFI page
1160 * table and when we do so and make changes to those PGDs like unmapping
1161 * stuff from them, those changes appear in the kernel page table and we
1162 * go boom.
1163 *
1164 * From setup_real_mode():
1165 *
1166 * ...
1167 * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd;
1168 *
1169 * In this particular case, our allocation is in PGD 0 of the EFI page
1170 * table but we've copied that PGD from PGD[272] of the EFI page table:
1171 *
1172 * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272
1173 *
1174 * where the direct memory mapping in kernel space is.
1175 *
1176 * new_memmap's VA comes from that direct mapping and thus clearing it,
1177 * it would get cleared in the kernel page table too.
1178 *
1179 * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift);
1180 */
1181 free_pages((unsigned long)new_memmap, pg_shift);
1182
1183 /* clean DUMMY object */
1184 efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1185 EFI_VARIABLE_NON_VOLATILE |
1186 EFI_VARIABLE_BOOTSERVICE_ACCESS |
1187 EFI_VARIABLE_RUNTIME_ACCESS,
1188 0, NULL);
1189 }
1190
1191 void __init efi_enter_virtual_mode(void)
1192 {
1193 if (efi_setup)
1194 kexec_enter_virtual_mode();
1195 else
1196 __efi_enter_virtual_mode();
1197 }
1198
1199 /*
1200 * Convenience functions to obtain memory types and attributes
1201 */
1202 u32 efi_mem_type(unsigned long phys_addr)
1203 {
1204 efi_memory_desc_t *md;
1205 void *p;
1206
1207 if (!efi_enabled(EFI_MEMMAP))
1208 return 0;
1209
1210 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1211 md = p;
1212 if ((md->phys_addr <= phys_addr) &&
1213 (phys_addr < (md->phys_addr +
1214 (md->num_pages << EFI_PAGE_SHIFT))))
1215 return md->type;
1216 }
1217 return 0;
1218 }
1219
1220 u64 efi_mem_attributes(unsigned long phys_addr)
1221 {
1222 efi_memory_desc_t *md;
1223 void *p;
1224
1225 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1226 md = p;
1227 if ((md->phys_addr <= phys_addr) &&
1228 (phys_addr < (md->phys_addr +
1229 (md->num_pages << EFI_PAGE_SHIFT))))
1230 return md->attribute;
1231 }
1232 return 0;
1233 }
1234
1235 /*
1236 * Some firmware implementations refuse to boot if there's insufficient space
1237 * in the variable store. Ensure that we never use more than a safe limit.
1238 *
1239 * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable
1240 * store.
1241 */
1242 efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
1243 {
1244 efi_status_t status;
1245 u64 storage_size, remaining_size, max_size;
1246
1247 if (!(attributes & EFI_VARIABLE_NON_VOLATILE))
1248 return 0;
1249
1250 status = efi.query_variable_info(attributes, &storage_size,
1251 &remaining_size, &max_size);
1252 if (status != EFI_SUCCESS)
1253 return status;
1254
1255 /*
1256 * We account for that by refusing the write if permitting it would
1257 * reduce the available space to under 5KB. This figure was provided by
1258 * Samsung, so should be safe.
1259 */
1260 if ((remaining_size - size < EFI_MIN_RESERVE) &&
1261 !efi_no_storage_paranoia) {
1262
1263 /*
1264 * Triggering garbage collection may require that the firmware
1265 * generate a real EFI_OUT_OF_RESOURCES error. We can force
1266 * that by attempting to use more space than is available.
1267 */
1268 unsigned long dummy_size = remaining_size + 1024;
1269 void *dummy = kzalloc(dummy_size, GFP_ATOMIC);
1270
1271 if (!dummy)
1272 return EFI_OUT_OF_RESOURCES;
1273
1274 status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1275 EFI_VARIABLE_NON_VOLATILE |
1276 EFI_VARIABLE_BOOTSERVICE_ACCESS |
1277 EFI_VARIABLE_RUNTIME_ACCESS,
1278 dummy_size, dummy);
1279
1280 if (status == EFI_SUCCESS) {
1281 /*
1282 * This should have failed, so if it didn't make sure
1283 * that we delete it...
1284 */
1285 efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1286 EFI_VARIABLE_NON_VOLATILE |
1287 EFI_VARIABLE_BOOTSERVICE_ACCESS |
1288 EFI_VARIABLE_RUNTIME_ACCESS,
1289 0, dummy);
1290 }
1291
1292 kfree(dummy);
1293
1294 /*
1295 * The runtime code may now have triggered a garbage collection
1296 * run, so check the variable info again
1297 */
1298 status = efi.query_variable_info(attributes, &storage_size,
1299 &remaining_size, &max_size);
1300
1301 if (status != EFI_SUCCESS)
1302 return status;
1303
1304 /*
1305 * There still isn't enough room, so return an error
1306 */
1307 if (remaining_size - size < EFI_MIN_RESERVE)
1308 return EFI_OUT_OF_RESOURCES;
1309 }
1310
1311 return EFI_SUCCESS;
1312 }
1313 EXPORT_SYMBOL_GPL(efi_query_variable_store);
1314
1315 static int __init parse_efi_cmdline(char *str)
1316 {
1317 if (*str == '=')
1318 str++;
1319
1320 if (!strncmp(str, "old_map", 7))
1321 set_bit(EFI_OLD_MEMMAP, &efi.flags);
1322
1323 return 0;
1324 }
1325 early_param("efi", parse_efi_cmdline);
1326
1327 void __init efi_apply_memmap_quirks(void)
1328 {
1329 /*
1330 * Once setup is done earlier, unmap the EFI memory map on mismatched
1331 * firmware/kernel architectures since there is no support for runtime
1332 * services.
1333 */
1334 if (!efi_runtime_supported()) {
1335 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
1336 efi_unmap_memmap();
1337 }
1338
1339 /*
1340 * UV doesn't support the new EFI pagetable mapping yet.
1341 */
1342 if (is_uv_system())
1343 set_bit(EFI_OLD_MEMMAP, &efi.flags);
1344 }
Linux kernel - Deliverables
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