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efi: Defer freeing boot services memory until after ACPI init
[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/export.h>
35 #include <linux/bootmem.h>
36 #include <linux/memblock.h>
37 #include <linux/spinlock.h>
38 #include <linux/uaccess.h>
39 #include <linux/time.h>
40 #include <linux/io.h>
41 #include <linux/reboot.h>
42 #include <linux/bcd.h>
43
44 #include <asm/setup.h>
45 #include <asm/efi.h>
46 #include <asm/time.h>
47 #include <asm/cacheflush.h>
48 #include <asm/tlbflush.h>
49 #include <asm/x86_init.h>
50
51 #define EFI_DEBUG 1
52
53 int efi_enabled;
54 EXPORT_SYMBOL(efi_enabled);
55
56 struct efi __read_mostly efi = {
57 .mps = EFI_INVALID_TABLE_ADDR,
58 .acpi = EFI_INVALID_TABLE_ADDR,
59 .acpi20 = EFI_INVALID_TABLE_ADDR,
60 .smbios = EFI_INVALID_TABLE_ADDR,
61 .sal_systab = EFI_INVALID_TABLE_ADDR,
62 .boot_info = EFI_INVALID_TABLE_ADDR,
63 .hcdp = EFI_INVALID_TABLE_ADDR,
64 .uga = EFI_INVALID_TABLE_ADDR,
65 .uv_systab = EFI_INVALID_TABLE_ADDR,
66 };
67 EXPORT_SYMBOL(efi);
68
69 struct efi_memory_map memmap;
70
71 bool efi_64bit;
72 static bool efi_native;
73
74 static struct efi efi_phys __initdata;
75 static efi_system_table_t efi_systab __initdata;
76
77 static int __init setup_noefi(char *arg)
78 {
79 efi_enabled = 0;
80 return 0;
81 }
82 early_param("noefi", setup_noefi);
83
84 int add_efi_memmap;
85 EXPORT_SYMBOL(add_efi_memmap);
86
87 static int __init setup_add_efi_memmap(char *arg)
88 {
89 add_efi_memmap = 1;
90 return 0;
91 }
92 early_param("add_efi_memmap", setup_add_efi_memmap);
93
94
95 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
96 {
97 unsigned long flags;
98 efi_status_t status;
99
100 spin_lock_irqsave(&rtc_lock, flags);
101 status = efi_call_virt2(get_time, tm, tc);
102 spin_unlock_irqrestore(&rtc_lock, flags);
103 return status;
104 }
105
106 static efi_status_t virt_efi_set_time(efi_time_t *tm)
107 {
108 unsigned long flags;
109 efi_status_t status;
110
111 spin_lock_irqsave(&rtc_lock, flags);
112 status = efi_call_virt1(set_time, tm);
113 spin_unlock_irqrestore(&rtc_lock, flags);
114 return status;
115 }
116
117 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
118 efi_bool_t *pending,
119 efi_time_t *tm)
120 {
121 unsigned long flags;
122 efi_status_t status;
123
124 spin_lock_irqsave(&rtc_lock, flags);
125 status = efi_call_virt3(get_wakeup_time,
126 enabled, pending, tm);
127 spin_unlock_irqrestore(&rtc_lock, flags);
128 return status;
129 }
130
131 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, 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_virt2(set_wakeup_time,
138 enabled, tm);
139 spin_unlock_irqrestore(&rtc_lock, flags);
140 return status;
141 }
142
143 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
144 efi_guid_t *vendor,
145 u32 *attr,
146 unsigned long *data_size,
147 void *data)
148 {
149 return efi_call_virt5(get_variable,
150 name, vendor, attr,
151 data_size, data);
152 }
153
154 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
155 efi_char16_t *name,
156 efi_guid_t *vendor)
157 {
158 return efi_call_virt3(get_next_variable,
159 name_size, name, vendor);
160 }
161
162 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
163 efi_guid_t *vendor,
164 u32 attr,
165 unsigned long data_size,
166 void *data)
167 {
168 return efi_call_virt5(set_variable,
169 name, vendor, attr,
170 data_size, data);
171 }
172
173 static efi_status_t virt_efi_query_variable_info(u32 attr,
174 u64 *storage_space,
175 u64 *remaining_space,
176 u64 *max_variable_size)
177 {
178 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
179 return EFI_UNSUPPORTED;
180
181 return efi_call_virt4(query_variable_info, attr, storage_space,
182 remaining_space, max_variable_size);
183 }
184
185 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
186 {
187 return efi_call_virt1(get_next_high_mono_count, count);
188 }
189
190 static void virt_efi_reset_system(int reset_type,
191 efi_status_t status,
192 unsigned long data_size,
193 efi_char16_t *data)
194 {
195 efi_call_virt4(reset_system, reset_type, status,
196 data_size, data);
197 }
198
199 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
200 unsigned long count,
201 unsigned long sg_list)
202 {
203 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
204 return EFI_UNSUPPORTED;
205
206 return efi_call_virt3(update_capsule, capsules, count, sg_list);
207 }
208
209 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
210 unsigned long count,
211 u64 *max_size,
212 int *reset_type)
213 {
214 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
215 return EFI_UNSUPPORTED;
216
217 return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
218 reset_type);
219 }
220
221 static efi_status_t __init phys_efi_set_virtual_address_map(
222 unsigned long memory_map_size,
223 unsigned long descriptor_size,
224 u32 descriptor_version,
225 efi_memory_desc_t *virtual_map)
226 {
227 efi_status_t status;
228
229 efi_call_phys_prelog();
230 status = efi_call_phys4(efi_phys.set_virtual_address_map,
231 memory_map_size, descriptor_size,
232 descriptor_version, virtual_map);
233 efi_call_phys_epilog();
234 return status;
235 }
236
237 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
238 efi_time_cap_t *tc)
239 {
240 unsigned long flags;
241 efi_status_t status;
242
243 spin_lock_irqsave(&rtc_lock, flags);
244 efi_call_phys_prelog();
245 status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
246 virt_to_phys(tc));
247 efi_call_phys_epilog();
248 spin_unlock_irqrestore(&rtc_lock, flags);
249 return status;
250 }
251
252 int efi_set_rtc_mmss(unsigned long nowtime)
253 {
254 int real_seconds, real_minutes;
255 efi_status_t status;
256 efi_time_t eft;
257 efi_time_cap_t cap;
258
259 status = efi.get_time(&eft, &cap);
260 if (status != EFI_SUCCESS) {
261 pr_err("Oops: efitime: can't read time!\n");
262 return -1;
263 }
264
265 real_seconds = nowtime % 60;
266 real_minutes = nowtime / 60;
267 if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
268 real_minutes += 30;
269 real_minutes %= 60;
270 eft.minute = real_minutes;
271 eft.second = real_seconds;
272
273 status = efi.set_time(&eft);
274 if (status != EFI_SUCCESS) {
275 pr_err("Oops: efitime: can't write time!\n");
276 return -1;
277 }
278 return 0;
279 }
280
281 unsigned long efi_get_time(void)
282 {
283 efi_status_t status;
284 efi_time_t eft;
285 efi_time_cap_t cap;
286
287 status = efi.get_time(&eft, &cap);
288 if (status != EFI_SUCCESS)
289 pr_err("Oops: efitime: can't read time!\n");
290
291 return mktime(eft.year, eft.month, eft.day, eft.hour,
292 eft.minute, eft.second);
293 }
294
295 /*
296 * Tell the kernel about the EFI memory map. This might include
297 * more than the max 128 entries that can fit in the e820 legacy
298 * (zeropage) memory map.
299 */
300
301 static void __init do_add_efi_memmap(void)
302 {
303 void *p;
304
305 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
306 efi_memory_desc_t *md = p;
307 unsigned long long start = md->phys_addr;
308 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
309 int e820_type;
310
311 switch (md->type) {
312 case EFI_LOADER_CODE:
313 case EFI_LOADER_DATA:
314 case EFI_BOOT_SERVICES_CODE:
315 case EFI_BOOT_SERVICES_DATA:
316 case EFI_CONVENTIONAL_MEMORY:
317 if (md->attribute & EFI_MEMORY_WB)
318 e820_type = E820_RAM;
319 else
320 e820_type = E820_RESERVED;
321 break;
322 case EFI_ACPI_RECLAIM_MEMORY:
323 e820_type = E820_ACPI;
324 break;
325 case EFI_ACPI_MEMORY_NVS:
326 e820_type = E820_NVS;
327 break;
328 case EFI_UNUSABLE_MEMORY:
329 e820_type = E820_UNUSABLE;
330 break;
331 default:
332 /*
333 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
334 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
335 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
336 */
337 e820_type = E820_RESERVED;
338 break;
339 }
340 e820_add_region(start, size, e820_type);
341 }
342 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
343 }
344
345 int __init efi_memblock_x86_reserve_range(void)
346 {
347 unsigned long pmap;
348
349 #ifdef CONFIG_X86_32
350 /* Can't handle data above 4GB at this time */
351 if (boot_params.efi_info.efi_memmap_hi) {
352 pr_err("Memory map is above 4GB, disabling EFI.\n");
353 return -EINVAL;
354 }
355 pmap = boot_params.efi_info.efi_memmap;
356 #else
357 pmap = (boot_params.efi_info.efi_memmap |
358 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
359 #endif
360 memmap.phys_map = (void *)pmap;
361 memmap.nr_map = boot_params.efi_info.efi_memmap_size /
362 boot_params.efi_info.efi_memdesc_size;
363 memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
364 memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
365 memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
366
367 return 0;
368 }
369
370 #if EFI_DEBUG
371 static void __init print_efi_memmap(void)
372 {
373 efi_memory_desc_t *md;
374 void *p;
375 int i;
376
377 for (p = memmap.map, i = 0;
378 p < memmap.map_end;
379 p += memmap.desc_size, i++) {
380 md = p;
381 pr_info("mem%02u: type=%u, attr=0x%llx, "
382 "range=[0x%016llx-0x%016llx) (%lluMB)\n",
383 i, md->type, md->attribute, md->phys_addr,
384 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
385 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
386 }
387 }
388 #endif /* EFI_DEBUG */
389
390 void __init efi_reserve_boot_services(void)
391 {
392 void *p;
393
394 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
395 efi_memory_desc_t *md = p;
396 u64 start = md->phys_addr;
397 u64 size = md->num_pages << EFI_PAGE_SHIFT;
398
399 if (md->type != EFI_BOOT_SERVICES_CODE &&
400 md->type != EFI_BOOT_SERVICES_DATA)
401 continue;
402 /* Only reserve where possible:
403 * - Not within any already allocated areas
404 * - Not over any memory area (really needed, if above?)
405 * - Not within any part of the kernel
406 * - Not the bios reserved area
407 */
408 if ((start+size >= virt_to_phys(_text)
409 && start <= virt_to_phys(_end)) ||
410 !e820_all_mapped(start, start+size, E820_RAM) ||
411 memblock_is_region_reserved(start, size)) {
412 /* Could not reserve, skip it */
413 md->num_pages = 0;
414 memblock_dbg("Could not reserve boot range "
415 "[0x%010llx-0x%010llx]\n",
416 start, start+size-1);
417 } else
418 memblock_reserve(start, size);
419 }
420 }
421
422 static void __init efi_unmap_memmap(void)
423 {
424 if (memmap.map) {
425 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
426 memmap.map = NULL;
427 }
428 }
429
430 void __init efi_free_boot_services(void)
431 {
432 void *p;
433
434 if (!efi_native)
435 return;
436
437 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
438 efi_memory_desc_t *md = p;
439 unsigned long long start = md->phys_addr;
440 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
441
442 if (md->type != EFI_BOOT_SERVICES_CODE &&
443 md->type != EFI_BOOT_SERVICES_DATA)
444 continue;
445
446 /* Could not reserve boot area */
447 if (!size)
448 continue;
449
450 free_bootmem_late(start, size);
451 }
452
453 efi_unmap_memmap();
454 }
455
456 static int __init efi_systab_init(void *phys)
457 {
458 if (efi_64bit) {
459 efi_system_table_64_t *systab64;
460 u64 tmp = 0;
461
462 systab64 = early_ioremap((unsigned long)phys,
463 sizeof(*systab64));
464 if (systab64 == NULL) {
465 pr_err("Couldn't map the system table!\n");
466 return -ENOMEM;
467 }
468
469 efi_systab.hdr = systab64->hdr;
470 efi_systab.fw_vendor = systab64->fw_vendor;
471 tmp |= systab64->fw_vendor;
472 efi_systab.fw_revision = systab64->fw_revision;
473 efi_systab.con_in_handle = systab64->con_in_handle;
474 tmp |= systab64->con_in_handle;
475 efi_systab.con_in = systab64->con_in;
476 tmp |= systab64->con_in;
477 efi_systab.con_out_handle = systab64->con_out_handle;
478 tmp |= systab64->con_out_handle;
479 efi_systab.con_out = systab64->con_out;
480 tmp |= systab64->con_out;
481 efi_systab.stderr_handle = systab64->stderr_handle;
482 tmp |= systab64->stderr_handle;
483 efi_systab.stderr = systab64->stderr;
484 tmp |= systab64->stderr;
485 efi_systab.runtime = (void *)(unsigned long)systab64->runtime;
486 tmp |= systab64->runtime;
487 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
488 tmp |= systab64->boottime;
489 efi_systab.nr_tables = systab64->nr_tables;
490 efi_systab.tables = systab64->tables;
491 tmp |= systab64->tables;
492
493 early_iounmap(systab64, sizeof(*systab64));
494 #ifdef CONFIG_X86_32
495 if (tmp >> 32) {
496 pr_err("EFI data located above 4GB, disabling EFI.\n");
497 return -EINVAL;
498 }
499 #endif
500 } else {
501 efi_system_table_32_t *systab32;
502
503 systab32 = early_ioremap((unsigned long)phys,
504 sizeof(*systab32));
505 if (systab32 == NULL) {
506 pr_err("Couldn't map the system table!\n");
507 return -ENOMEM;
508 }
509
510 efi_systab.hdr = systab32->hdr;
511 efi_systab.fw_vendor = systab32->fw_vendor;
512 efi_systab.fw_revision = systab32->fw_revision;
513 efi_systab.con_in_handle = systab32->con_in_handle;
514 efi_systab.con_in = systab32->con_in;
515 efi_systab.con_out_handle = systab32->con_out_handle;
516 efi_systab.con_out = systab32->con_out;
517 efi_systab.stderr_handle = systab32->stderr_handle;
518 efi_systab.stderr = systab32->stderr;
519 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
520 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
521 efi_systab.nr_tables = systab32->nr_tables;
522 efi_systab.tables = systab32->tables;
523
524 early_iounmap(systab32, sizeof(*systab32));
525 }
526
527 efi.systab = &efi_systab;
528
529 /*
530 * Verify the EFI Table
531 */
532 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
533 pr_err("System table signature incorrect!\n");
534 return -EINVAL;
535 }
536 if ((efi.systab->hdr.revision >> 16) == 0)
537 pr_err("Warning: System table version "
538 "%d.%02d, expected 1.00 or greater!\n",
539 efi.systab->hdr.revision >> 16,
540 efi.systab->hdr.revision & 0xffff);
541
542 return 0;
543 }
544
545 static int __init efi_config_init(u64 tables, int nr_tables)
546 {
547 void *config_tables, *tablep;
548 int i, sz;
549
550 if (efi_64bit)
551 sz = sizeof(efi_config_table_64_t);
552 else
553 sz = sizeof(efi_config_table_32_t);
554
555 /*
556 * Let's see what config tables the firmware passed to us.
557 */
558 config_tables = early_ioremap(tables, nr_tables * sz);
559 if (config_tables == NULL) {
560 pr_err("Could not map Configuration table!\n");
561 return -ENOMEM;
562 }
563
564 tablep = config_tables;
565 pr_info("");
566 for (i = 0; i < efi.systab->nr_tables; i++) {
567 efi_guid_t guid;
568 unsigned long table;
569
570 if (efi_64bit) {
571 u64 table64;
572 guid = ((efi_config_table_64_t *)tablep)->guid;
573 table64 = ((efi_config_table_64_t *)tablep)->table;
574 table = table64;
575 #ifdef CONFIG_X86_32
576 if (table64 >> 32) {
577 pr_cont("\n");
578 pr_err("Table located above 4GB, disabling EFI.\n");
579 early_iounmap(config_tables,
580 efi.systab->nr_tables * sz);
581 return -EINVAL;
582 }
583 #endif
584 } else {
585 guid = ((efi_config_table_32_t *)tablep)->guid;
586 table = ((efi_config_table_32_t *)tablep)->table;
587 }
588 if (!efi_guidcmp(guid, MPS_TABLE_GUID)) {
589 efi.mps = table;
590 pr_cont(" MPS=0x%lx ", table);
591 } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) {
592 efi.acpi20 = table;
593 pr_cont(" ACPI 2.0=0x%lx ", table);
594 } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) {
595 efi.acpi = table;
596 pr_cont(" ACPI=0x%lx ", table);
597 } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) {
598 efi.smbios = table;
599 pr_cont(" SMBIOS=0x%lx ", table);
600 #ifdef CONFIG_X86_UV
601 } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) {
602 efi.uv_systab = table;
603 pr_cont(" UVsystab=0x%lx ", table);
604 #endif
605 } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) {
606 efi.hcdp = table;
607 pr_cont(" HCDP=0x%lx ", table);
608 } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) {
609 efi.uga = table;
610 pr_cont(" UGA=0x%lx ", table);
611 }
612 tablep += sz;
613 }
614 pr_cont("\n");
615 early_iounmap(config_tables, efi.systab->nr_tables * sz);
616 return 0;
617 }
618
619 static int __init efi_runtime_init(void)
620 {
621 efi_runtime_services_t *runtime;
622
623 /*
624 * Check out the runtime services table. We need to map
625 * the runtime services table so that we can grab the physical
626 * address of several of the EFI runtime functions, needed to
627 * set the firmware into virtual mode.
628 */
629 runtime = early_ioremap((unsigned long)efi.systab->runtime,
630 sizeof(efi_runtime_services_t));
631 if (!runtime) {
632 pr_err("Could not map the runtime service table!\n");
633 return -ENOMEM;
634 }
635 /*
636 * We will only need *early* access to the following
637 * two EFI runtime services before set_virtual_address_map
638 * is invoked.
639 */
640 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
641 efi_phys.set_virtual_address_map =
642 (efi_set_virtual_address_map_t *)
643 runtime->set_virtual_address_map;
644 /*
645 * Make efi_get_time can be called before entering
646 * virtual mode.
647 */
648 efi.get_time = phys_efi_get_time;
649 early_iounmap(runtime, sizeof(efi_runtime_services_t));
650
651 return 0;
652 }
653
654 static int __init efi_memmap_init(void)
655 {
656 /* Map the EFI memory map */
657 memmap.map = early_ioremap((unsigned long)memmap.phys_map,
658 memmap.nr_map * memmap.desc_size);
659 if (memmap.map == NULL) {
660 pr_err("Could not map the memory map!\n");
661 return -ENOMEM;
662 }
663 memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
664
665 if (add_efi_memmap)
666 do_add_efi_memmap();
667
668 return 0;
669 }
670
671 void __init efi_init(void)
672 {
673 efi_char16_t *c16;
674 char vendor[100] = "unknown";
675 int i = 0;
676 void *tmp;
677
678 #ifdef CONFIG_X86_32
679 if (boot_params.efi_info.efi_systab_hi ||
680 boot_params.efi_info.efi_memmap_hi) {
681 pr_info("Table located above 4GB, disabling EFI.\n");
682 efi_enabled = 0;
683 return;
684 }
685 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
686 efi_native = !efi_64bit;
687 #else
688 efi_phys.systab = (efi_system_table_t *)
689 (boot_params.efi_info.efi_systab |
690 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
691 efi_native = efi_64bit;
692 #endif
693
694 if (efi_systab_init(efi_phys.systab)) {
695 efi_enabled = 0;
696 return;
697 }
698
699 /*
700 * Show what we know for posterity
701 */
702 c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
703 if (c16) {
704 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
705 vendor[i] = *c16++;
706 vendor[i] = '\0';
707 } else
708 pr_err("Could not map the firmware vendor!\n");
709 early_iounmap(tmp, 2);
710
711 pr_info("EFI v%u.%.02u by %s\n",
712 efi.systab->hdr.revision >> 16,
713 efi.systab->hdr.revision & 0xffff, vendor);
714
715 if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) {
716 efi_enabled = 0;
717 return;
718 }
719
720 /*
721 * Note: We currently don't support runtime services on an EFI
722 * that doesn't match the kernel 32/64-bit mode.
723 */
724
725 if (!efi_native)
726 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
727 else if (efi_runtime_init()) {
728 efi_enabled = 0;
729 return;
730 }
731
732 if (efi_memmap_init()) {
733 efi_enabled = 0;
734 return;
735 }
736 #ifdef CONFIG_X86_32
737 if (efi_native) {
738 x86_platform.get_wallclock = efi_get_time;
739 x86_platform.set_wallclock = efi_set_rtc_mmss;
740 }
741 #endif
742
743 #if EFI_DEBUG
744 print_efi_memmap();
745 #endif
746 }
747
748 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
749 {
750 u64 addr, npages;
751
752 addr = md->virt_addr;
753 npages = md->num_pages;
754
755 memrange_efi_to_native(&addr, &npages);
756
757 if (executable)
758 set_memory_x(addr, npages);
759 else
760 set_memory_nx(addr, npages);
761 }
762
763 static void __init runtime_code_page_mkexec(void)
764 {
765 efi_memory_desc_t *md;
766 void *p;
767
768 /* Make EFI runtime service code area executable */
769 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
770 md = p;
771
772 if (md->type != EFI_RUNTIME_SERVICES_CODE)
773 continue;
774
775 efi_set_executable(md, true);
776 }
777 }
778
779 /*
780 * This function will switch the EFI runtime services to virtual mode.
781 * Essentially, look through the EFI memmap and map every region that
782 * has the runtime attribute bit set in its memory descriptor and update
783 * that memory descriptor with the virtual address obtained from ioremap().
784 * This enables the runtime services to be called without having to
785 * thunk back into physical mode for every invocation.
786 */
787 void __init efi_enter_virtual_mode(void)
788 {
789 efi_memory_desc_t *md, *prev_md = NULL;
790 efi_status_t status;
791 unsigned long size;
792 u64 end, systab, addr, npages, end_pfn;
793 void *p, *va, *new_memmap = NULL;
794 int count = 0;
795
796 efi.systab = NULL;
797
798 /*
799 * We don't do virtual mode, since we don't do runtime services, on
800 * non-native EFI
801 */
802
803 if (!efi_native) {
804 efi_unmap_memmap();
805 return;
806 }
807
808 /* Merge contiguous regions of the same type and attribute */
809 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
810 u64 prev_size;
811 md = p;
812
813 if (!prev_md) {
814 prev_md = md;
815 continue;
816 }
817
818 if (prev_md->type != md->type ||
819 prev_md->attribute != md->attribute) {
820 prev_md = md;
821 continue;
822 }
823
824 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
825
826 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
827 prev_md->num_pages += md->num_pages;
828 md->type = EFI_RESERVED_TYPE;
829 md->attribute = 0;
830 continue;
831 }
832 prev_md = md;
833 }
834
835 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
836 md = p;
837 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
838 md->type != EFI_BOOT_SERVICES_CODE &&
839 md->type != EFI_BOOT_SERVICES_DATA)
840 continue;
841
842 size = md->num_pages << EFI_PAGE_SHIFT;
843 end = md->phys_addr + size;
844
845 end_pfn = PFN_UP(end);
846 if (end_pfn <= max_low_pfn_mapped
847 || (end_pfn > (1UL << (32 - PAGE_SHIFT))
848 && end_pfn <= max_pfn_mapped))
849 va = __va(md->phys_addr);
850 else
851 va = efi_ioremap(md->phys_addr, size, md->type);
852
853 md->virt_addr = (u64) (unsigned long) va;
854
855 if (!va) {
856 pr_err("ioremap of 0x%llX failed!\n",
857 (unsigned long long)md->phys_addr);
858 continue;
859 }
860
861 if (!(md->attribute & EFI_MEMORY_WB)) {
862 addr = md->virt_addr;
863 npages = md->num_pages;
864 memrange_efi_to_native(&addr, &npages);
865 set_memory_uc(addr, npages);
866 }
867
868 systab = (u64) (unsigned long) efi_phys.systab;
869 if (md->phys_addr <= systab && systab < end) {
870 systab += md->virt_addr - md->phys_addr;
871 efi.systab = (efi_system_table_t *) (unsigned long) systab;
872 }
873 new_memmap = krealloc(new_memmap,
874 (count + 1) * memmap.desc_size,
875 GFP_KERNEL);
876 memcpy(new_memmap + (count * memmap.desc_size), md,
877 memmap.desc_size);
878 count++;
879 }
880
881 BUG_ON(!efi.systab);
882
883 status = phys_efi_set_virtual_address_map(
884 memmap.desc_size * count,
885 memmap.desc_size,
886 memmap.desc_version,
887 (efi_memory_desc_t *)__pa(new_memmap));
888
889 if (status != EFI_SUCCESS) {
890 pr_alert("Unable to switch EFI into virtual mode "
891 "(status=%lx)!\n", status);
892 panic("EFI call to SetVirtualAddressMap() failed!");
893 }
894
895 /*
896 * Now that EFI is in virtual mode, update the function
897 * pointers in the runtime service table to the new virtual addresses.
898 *
899 * Call EFI services through wrapper functions.
900 */
901 efi.runtime_version = efi_systab.fw_revision;
902 efi.get_time = virt_efi_get_time;
903 efi.set_time = virt_efi_set_time;
904 efi.get_wakeup_time = virt_efi_get_wakeup_time;
905 efi.set_wakeup_time = virt_efi_set_wakeup_time;
906 efi.get_variable = virt_efi_get_variable;
907 efi.get_next_variable = virt_efi_get_next_variable;
908 efi.set_variable = virt_efi_set_variable;
909 efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
910 efi.reset_system = virt_efi_reset_system;
911 efi.set_virtual_address_map = NULL;
912 efi.query_variable_info = virt_efi_query_variable_info;
913 efi.update_capsule = virt_efi_update_capsule;
914 efi.query_capsule_caps = virt_efi_query_capsule_caps;
915 if (__supported_pte_mask & _PAGE_NX)
916 runtime_code_page_mkexec();
917
918 kfree(new_memmap);
919 }
920
921 /*
922 * Convenience functions to obtain memory types and attributes
923 */
924 u32 efi_mem_type(unsigned long phys_addr)
925 {
926 efi_memory_desc_t *md;
927 void *p;
928
929 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
930 md = p;
931 if ((md->phys_addr <= phys_addr) &&
932 (phys_addr < (md->phys_addr +
933 (md->num_pages << EFI_PAGE_SHIFT))))
934 return md->type;
935 }
936 return 0;
937 }
938
939 u64 efi_mem_attributes(unsigned long phys_addr)
940 {
941 efi_memory_desc_t *md;
942 void *p;
943
944 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
945 md = p;
946 if ((md->phys_addr <= phys_addr) &&
947 (phys_addr < (md->phys_addr +
948 (md->num_pages << EFI_PAGE_SHIFT))))
949 return md->attribute;
950 }
951 return 0;
952 }
Linux kernel - Deliverables
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