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x86, efi: Properly pre-initialize table pointers
[linux-2.6-block.git] / arch / x86 / platform / efi / efi.c
CommitLineData
5b83683f
HY		 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#include <linux/kernel.h>
30#include <linux/init.h>
31#include <linux/efi.h>
32#include <linux/bootmem.h>
a9ce6bc1 33#include <linux/memblock.h>
5b83683f
HY		 34#include <linux/spinlock.h>
35#include <linux/uaccess.h>
36#include <linux/time.h>
37#include <linux/io.h>
38#include <linux/reboot.h>
39#include <linux/bcd.h>
40
41#include <asm/setup.h>
42#include <asm/efi.h>
43#include <asm/time.h>
a2172e25
HY		 44#include <asm/cacheflush.h>
45#include <asm/tlbflush.h>
7bd867df 46#include <asm/x86_init.h>
5b83683f
HY		 47
48#define EFI_DEBUG 1
49#define PFX "EFI: "
50
51int efi_enabled;
52EXPORT_SYMBOL(efi_enabled);
53
d80603c9
JB		 54struct 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};
5b83683f
HY		 65EXPORT_SYMBOL(efi);
66
67struct efi_memory_map memmap;
68
ecaea42e 69static struct efi efi_phys __initdata;
5b83683f
HY		 70static efi_system_table_t efi_systab __initdata;
71
8b2cb7a8
HY		 72static int __init setup_noefi(char *arg)
73{
74 efi_enabled = 0;
75 return 0;
76}
77early_param("noefi", setup_noefi);
78
200001eb
PJ		 79int add_efi_memmap;
80EXPORT_SYMBOL(add_efi_memmap);
81
82static int __init setup_add_efi_memmap(char *arg)
83{
84 add_efi_memmap = 1;
85 return 0;
86}
87early_param("add_efi_memmap", setup_add_efi_memmap);
88
89
5b83683f
HY		 90static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
91{
92 return efi_call_virt2(get_time, tm, tc);
93}
94
95static efi_status_t virt_efi_set_time(efi_time_t *tm)
96{
97 return efi_call_virt1(set_time, tm);
98}
99
100static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
101 efi_bool_t *pending,
102 efi_time_t *tm)
103{
104 return efi_call_virt3(get_wakeup_time,
105 enabled, pending, tm);
106}
107
108static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
109{
110 return efi_call_virt2(set_wakeup_time,
111 enabled, tm);
112}
113
114static efi_status_t virt_efi_get_variable(efi_char16_t *name,
115 efi_guid_t *vendor,
116 u32 *attr,
117 unsigned long *data_size,
118 void *data)
119{
120 return efi_call_virt5(get_variable,
121 name, vendor, attr,
122 data_size, data);
123}
124
125static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
126 efi_char16_t *name,
127 efi_guid_t *vendor)
128{
129 return efi_call_virt3(get_next_variable,
130 name_size, name, vendor);
131}
132
133static efi_status_t virt_efi_set_variable(efi_char16_t *name,
134 efi_guid_t *vendor,
f7a2d73f 135 u32 attr,
5b83683f
HY		 136 unsigned long data_size,
137 void *data)
138{
139 return efi_call_virt5(set_variable,
140 name, vendor, attr,
141 data_size, data);
142}
143
3b370237
MG		 144static efi_status_t virt_efi_query_variable_info(u32 attr,
145 u64 *storage_space,
146 u64 *remaining_space,
147 u64 *max_variable_size)
148{
149 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
150 return EFI_UNSUPPORTED;
151
152 return efi_call_virt4(query_variable_info, attr, storage_space,
153 remaining_space, max_variable_size);
154}
155
5b83683f
HY		 156static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
157{
158 return efi_call_virt1(get_next_high_mono_count, count);
159}
160
161static void virt_efi_reset_system(int reset_type,
162 efi_status_t status,
163 unsigned long data_size,
164 efi_char16_t *data)
165{
166 efi_call_virt4(reset_system, reset_type, status,
167 data_size, data);
168}
169
3b370237
MG		 170static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
171 unsigned long count,
172 unsigned long sg_list)
173{
174 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
175 return EFI_UNSUPPORTED;
176
177 return efi_call_virt3(update_capsule, capsules, count, sg_list);
178}
179
180static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
181 unsigned long count,
182 u64 *max_size,
183 int *reset_type)
184{
185 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
186 return EFI_UNSUPPORTED;
187
188 return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
189 reset_type);
190}
191
5b83683f
HY		 192static efi_status_t __init phys_efi_set_virtual_address_map(
193 unsigned long memory_map_size,
194 unsigned long descriptor_size,
195 u32 descriptor_version,
196 efi_memory_desc_t *virtual_map)
197{
198 efi_status_t status;
199
200 efi_call_phys_prelog();
201 status = efi_call_phys4(efi_phys.set_virtual_address_map,
202 memory_map_size, descriptor_size,
203 descriptor_version, virtual_map);
204 efi_call_phys_epilog();
205 return status;
206}
207
208static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
209 efi_time_cap_t *tc)
210{
211 efi_status_t status;
212
213 efi_call_phys_prelog();
214 status = efi_call_phys2(efi_phys.get_time, tm, tc);
215 efi_call_phys_epilog();
216 return status;
217}
218
219int efi_set_rtc_mmss(unsigned long nowtime)
220{
221 int real_seconds, real_minutes;
222 efi_status_t status;
223 efi_time_t eft;
224 efi_time_cap_t cap;
225
226 status = efi.get_time(&eft, &cap);
227 if (status != EFI_SUCCESS) {
228 printk(KERN_ERR "Oops: efitime: can't read time!\n");
229 return -1;
230 }
231
232 real_seconds = nowtime % 60;
233 real_minutes = nowtime / 60;
234 if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
235 real_minutes += 30;
236 real_minutes %= 60;
237 eft.minute = real_minutes;
238 eft.second = real_seconds;
239
240 status = efi.set_time(&eft);
241 if (status != EFI_SUCCESS) {
242 printk(KERN_ERR "Oops: efitime: can't write time!\n");
243 return -1;
244 }
245 return 0;
246}
247
248unsigned long efi_get_time(void)
249{
250 efi_status_t status;
251 efi_time_t eft;
252 efi_time_cap_t cap;
253
254 status = efi.get_time(&eft, &cap);
255 if (status != EFI_SUCCESS)
256 printk(KERN_ERR "Oops: efitime: can't read time!\n");
257
258 return mktime(eft.year, eft.month, eft.day, eft.hour,
259 eft.minute, eft.second);
260}
261
69c91893
PJ		 262/*
263 * Tell the kernel about the EFI memory map. This might include
264 * more than the max 128 entries that can fit in the e820 legacy
265 * (zeropage) memory map.
266 */
267
200001eb 268static void __init do_add_efi_memmap(void)
69c91893
PJ		 269{
270 void *p;
271
272 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
273 efi_memory_desc_t *md = p;
274 unsigned long long start = md->phys_addr;
275 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
276 int e820_type;
277
e2a71476
CW		 278 switch (md->type) {
279 case EFI_LOADER_CODE:
280 case EFI_LOADER_DATA:
281 case EFI_BOOT_SERVICES_CODE:
282 case EFI_BOOT_SERVICES_DATA:
283 case EFI_CONVENTIONAL_MEMORY:
284 if (md->attribute & EFI_MEMORY_WB)
285 e820_type = E820_RAM;
286 else
287 e820_type = E820_RESERVED;
288 break;
289 case EFI_ACPI_RECLAIM_MEMORY:
290 e820_type = E820_ACPI;
291 break;
292 case EFI_ACPI_MEMORY_NVS:
293 e820_type = E820_NVS;
294 break;
295 case EFI_UNUSABLE_MEMORY:
296 e820_type = E820_UNUSABLE;
297 break;
298 default:
299 /*
300 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
301 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
302 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
303 */
69c91893 304 e820_type = E820_RESERVED;
e2a71476
CW		 305 break;
306 }
d0be6bde 307 e820_add_region(start, size, e820_type);
69c91893
PJ		 308 }
309 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
310}
311
a9ce6bc1 312void __init efi_memblock_x86_reserve_range(void)
ecacf09f
HY		 313{
314 unsigned long pmap;
315
05486fa7 316#ifdef CONFIG_X86_32
ecacf09f 317 pmap = boot_params.efi_info.efi_memmap;
05486fa7
PJ		 318#else
319 pmap = (boot_params.efi_info.efi_memmap |
320 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
ecacf09f
HY		 321#endif
322 memmap.phys_map = (void *)pmap;
323 memmap.nr_map = boot_params.efi_info.efi_memmap_size /
324 boot_params.efi_info.efi_memdesc_size;
325 memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
326 memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
a9ce6bc1 327 memblock_x86_reserve_range(pmap, pmap + memmap.nr_map * memmap.desc_size,
ecacf09f
HY		 328 "EFI memmap");
329}
330
5b83683f
HY		 331#if EFI_DEBUG
332static void __init print_efi_memmap(void)
333{
334 efi_memory_desc_t *md;
335 void *p;
336 int i;
337
338 for (p = memmap.map, i = 0;
339 p < memmap.map_end;
340 p += memmap.desc_size, i++) {
341 md = p;
342 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
343 "range=[0x%016llx-0x%016llx) (%lluMB)\n",
344 i, md->type, md->attribute, md->phys_addr,
345 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
346 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
347 }
348}
349#endif /* EFI_DEBUG */
350
916f676f
MG		 351void __init efi_reserve_boot_services(void)
352{
353 void *p;
354
355 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
356 efi_memory_desc_t *md = p;
357 unsigned long long start = md->phys_addr;
358 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
359
360 if (md->type != EFI_BOOT_SERVICES_CODE &&
361 md->type != EFI_BOOT_SERVICES_DATA)
362 continue;
363
364 memblock_x86_reserve_range(start, start + size, "EFI Boot");
365 }
366}
367
368static void __init efi_free_boot_services(void)
369{
370 void *p;
371
372 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
373 efi_memory_desc_t *md = p;
374 unsigned long long start = md->phys_addr;
375 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
376
377 if (md->type != EFI_BOOT_SERVICES_CODE &&
378 md->type != EFI_BOOT_SERVICES_DATA)
379 continue;
380
381 free_bootmem_late(start, size);
382 }
383}
384
5b83683f
HY		 385void __init efi_init(void)
386{
387 efi_config_table_t *config_tables;
388 efi_runtime_services_t *runtime;
389 efi_char16_t *c16;
390 char vendor[100] = "unknown";
391 int i = 0;
392 void *tmp;
393
05486fa7 394#ifdef CONFIG_X86_32
5b83683f 395 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
05486fa7
PJ		 396#else
397 efi_phys.systab = (efi_system_table_t *)
398 (boot_params.efi_info.efi_systab |
399 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
5b83683f 400#endif
5b83683f 401
beacfaac
HY		 402 efi.systab = early_ioremap((unsigned long)efi_phys.systab,
403 sizeof(efi_system_table_t));
5b83683f
HY		 404 if (efi.systab == NULL)
405 printk(KERN_ERR "Couldn't map the EFI system table!\n");
406 memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
beacfaac 407 early_iounmap(efi.systab, sizeof(efi_system_table_t));
5b83683f
HY		 408 efi.systab = &efi_systab;
409
410 /*
411 * Verify the EFI Table
412 */
413 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
414 printk(KERN_ERR "EFI system table signature incorrect!\n");
415 if ((efi.systab->hdr.revision >> 16) == 0)
416 printk(KERN_ERR "Warning: EFI system table version "
417 "%d.%02d, expected 1.00 or greater!\n",
418 efi.systab->hdr.revision >> 16,
419 efi.systab->hdr.revision & 0xffff);
420
421 /*
422 * Show what we know for posterity
423 */
beacfaac 424 c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
5b83683f 425 if (c16) {
fdb8a427 426 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
5b83683f
HY		 427 vendor[i] = *c16++;
428 vendor[i] = '\0';
429 } else
430 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
beacfaac 431 early_iounmap(tmp, 2);
5b83683f 432
3235dc3f 433 printk(KERN_INFO "EFI v%u.%.02u by %s\n",
5b83683f
HY		 434 efi.systab->hdr.revision >> 16,
435 efi.systab->hdr.revision & 0xffff, vendor);
436
437 /*
438 * Let's see what config tables the firmware passed to us.
439 */
beacfaac 440 config_tables = early_ioremap(
5b83683f
HY		 441 efi.systab->tables,
442 efi.systab->nr_tables * sizeof(efi_config_table_t));
443 if (config_tables == NULL)
444 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
445
446 printk(KERN_INFO);
447 for (i = 0; i < efi.systab->nr_tables; i++) {
448 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
449 efi.mps = config_tables[i].table;
450 printk(" MPS=0x%lx ", config_tables[i].table);
451 } else if (!efi_guidcmp(config_tables[i].guid,
452 ACPI_20_TABLE_GUID)) {
453 efi.acpi20 = config_tables[i].table;
454 printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
455 } else if (!efi_guidcmp(config_tables[i].guid,
456 ACPI_TABLE_GUID)) {
457 efi.acpi = config_tables[i].table;
458 printk(" ACPI=0x%lx ", config_tables[i].table);
459 } else if (!efi_guidcmp(config_tables[i].guid,
460 SMBIOS_TABLE_GUID)) {
461 efi.smbios = config_tables[i].table;
462 printk(" SMBIOS=0x%lx ", config_tables[i].table);
03b48632 463#ifdef CONFIG_X86_UV
a50f70b1
RA		 464 } else if (!efi_guidcmp(config_tables[i].guid,
465 UV_SYSTEM_TABLE_GUID)) {
466 efi.uv_systab = config_tables[i].table;
467 printk(" UVsystab=0x%lx ", config_tables[i].table);
03b48632 468#endif
5b83683f
HY		 469 } else if (!efi_guidcmp(config_tables[i].guid,
470 HCDP_TABLE_GUID)) {
471 efi.hcdp = config_tables[i].table;
472 printk(" HCDP=0x%lx ", config_tables[i].table);
473 } else if (!efi_guidcmp(config_tables[i].guid,
474 UGA_IO_PROTOCOL_GUID)) {
475 efi.uga = config_tables[i].table;
476 printk(" UGA=0x%lx ", config_tables[i].table);
477 }
478 }
479 printk("\n");
beacfaac 480 early_iounmap(config_tables,
5b83683f
HY		 481 efi.systab->nr_tables * sizeof(efi_config_table_t));
482
483 /*
484 * Check out the runtime services table. We need to map
485 * the runtime services table so that we can grab the physical
486 * address of several of the EFI runtime functions, needed to
487 * set the firmware into virtual mode.
488 */
beacfaac
HY		 489 runtime = early_ioremap((unsigned long)efi.systab->runtime,
490 sizeof(efi_runtime_services_t));
5b83683f
HY		 491 if (runtime != NULL) {
492 /*
493 * We will only need *early* access to the following
494 * two EFI runtime services before set_virtual_address_map
495 * is invoked.
496 */
497 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
498 efi_phys.set_virtual_address_map =
499 (efi_set_virtual_address_map_t *)
500 runtime->set_virtual_address_map;
501 /*
502 * Make efi_get_time can be called before entering
503 * virtual mode.
504 */
505 efi.get_time = phys_efi_get_time;
506 } else
507 printk(KERN_ERR "Could not map the EFI runtime service "
508 "table!\n");
beacfaac 509 early_iounmap(runtime, sizeof(efi_runtime_services_t));
5b83683f
HY		 510
511 /* Map the EFI memory map */
beacfaac
HY		 512 memmap.map = early_ioremap((unsigned long)memmap.phys_map,
513 memmap.nr_map * memmap.desc_size);
5b83683f
HY		 514 if (memmap.map == NULL)
515 printk(KERN_ERR "Could not map the EFI memory map!\n");
516 memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
175e438f 517
5b83683f 518 if (memmap.desc_size != sizeof(efi_memory_desc_t))
175e438f
RA		 519 printk(KERN_WARNING
520 "Kernel-defined memdesc doesn't match the one from EFI!\n");
521
200001eb
PJ		 522 if (add_efi_memmap)
523 do_add_efi_memmap();
5b83683f 524
772be899 525#ifdef CONFIG_X86_32
7bd867df
FT		 526 x86_platform.get_wallclock = efi_get_time;
527 x86_platform.set_wallclock = efi_set_rtc_mmss;
772be899 528#endif
7bd867df 529
5b83683f
HY		 530 /* Setup for EFI runtime service */
531 reboot_type = BOOT_EFI;
532
5b83683f
HY		 533#if EFI_DEBUG
534 print_efi_memmap();
535#endif
536}
537
9cd2b07c
MG		 538void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
539{
540 u64 addr, npages;
541
542 addr = md->virt_addr;
543 npages = md->num_pages;
544
545 memrange_efi_to_native(&addr, &npages);
546
547 if (executable)
548 set_memory_x(addr, npages);
549 else
550 set_memory_nx(addr, npages);
551}
552
a2172e25
HY		 553static void __init runtime_code_page_mkexec(void)
554{
555 efi_memory_desc_t *md;
a2172e25
HY		 556 void *p;
557
a2172e25
HY		 558 /* Make EFI runtime service code area executable */
559 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
560 md = p;
1c083eb2
HY		 561
562 if (md->type != EFI_RUNTIME_SERVICES_CODE)
563 continue;
564
9cd2b07c 565 efi_set_executable(md, true);
a2172e25 566 }
a2172e25 567}
a2172e25 568
5b83683f
HY		 569/*
570 * This function will switch the EFI runtime services to virtual mode.
571 * Essentially, look through the EFI memmap and map every region that
572 * has the runtime attribute bit set in its memory descriptor and update
573 * that memory descriptor with the virtual address obtained from ioremap().
574 * This enables the runtime services to be called without having to
575 * thunk back into physical mode for every invocation.
576 */
577void __init efi_enter_virtual_mode(void)
578{
202f9d0a 579 efi_memory_desc_t *md, *prev_md = NULL;
5b83683f 580 efi_status_t status;
1c083eb2 581 unsigned long size;
dd39ecf5 582 u64 end, systab, addr, npages, end_pfn;
7cb00b72
MG		 583 void *p, *va, *new_memmap = NULL;
584 int count = 0;
5b83683f
HY		 585
586 efi.systab = NULL;
202f9d0a
MG		 587
588 /* Merge contiguous regions of the same type and attribute */
589 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
590 u64 prev_size;
591 md = p;
592
593 if (!prev_md) {
594 prev_md = md;
595 continue;
596 }
597
598 if (prev_md->type != md->type ||
599 prev_md->attribute != md->attribute) {
600 prev_md = md;
601 continue;
602 }
603
604 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
605
606 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
607 prev_md->num_pages += md->num_pages;
608 md->type = EFI_RESERVED_TYPE;
609 md->attribute = 0;
610 continue;
611 }
612 prev_md = md;
613 }
614
5b83683f
HY		 615 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
616 md = p;
916f676f
MG		 617 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
618 md->type != EFI_BOOT_SERVICES_CODE &&
619 md->type != EFI_BOOT_SERVICES_DATA)
5b83683f 620 continue;
1c083eb2
HY		 621
622 size = md->num_pages << EFI_PAGE_SHIFT;
623 end = md->phys_addr + size;
624
dd39ecf5
HY		 625 end_pfn = PFN_UP(end);
626 if (end_pfn <= max_low_pfn_mapped
627 || (end_pfn > (1UL << (32 - PAGE_SHIFT))
628 && end_pfn <= max_pfn_mapped))
1c083eb2 629 va = __va(md->phys_addr);
5b83683f 630 else
6a7bbd57 631 va = efi_ioremap(md->phys_addr, size, md->type);
1c083eb2 632
1c083eb2
HY		 633 md->virt_addr = (u64) (unsigned long) va;
634
635 if (!va) {
5b83683f
HY		 636 printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
637 (unsigned long long)md->phys_addr);
1c083eb2
HY		 638 continue;
639 }
640
4a3575fd
HY		 641 if (!(md->attribute & EFI_MEMORY_WB)) {
642 addr = md->virt_addr;
643 npages = md->num_pages;
644 memrange_efi_to_native(&addr, &npages);
645 set_memory_uc(addr, npages);
646 }
e85f2051 647
1c083eb2
HY		 648 systab = (u64) (unsigned long) efi_phys.systab;
649 if (md->phys_addr <= systab && systab < end) {
650 systab += md->virt_addr - md->phys_addr;
651 efi.systab = (efi_system_table_t *) (unsigned long) systab;
652 }
7cb00b72
MG		 653 new_memmap = krealloc(new_memmap,
654 (count + 1) * memmap.desc_size,
655 GFP_KERNEL);
656 memcpy(new_memmap + (count * memmap.desc_size), md,
657 memmap.desc_size);
658 count++;
5b83683f
HY		 659 }
660
661 BUG_ON(!efi.systab);
662
663 status = phys_efi_set_virtual_address_map(
7cb00b72 664 memmap.desc_size * count,
5b83683f
HY		 665 memmap.desc_size,
666 memmap.desc_version,
7cb00b72 667 (efi_memory_desc_t *)__pa(new_memmap));
5b83683f
HY		 668
669 if (status != EFI_SUCCESS) {
670 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
671 "(status=%lx)!\n", status);
672 panic("EFI call to SetVirtualAddressMap() failed!");
673 }
674
916f676f
MG		 675 /*
676 * Thankfully, it does seem that no runtime services other than
677 * SetVirtualAddressMap() will touch boot services code, so we can
678 * get rid of it all at this point
679 */
680 efi_free_boot_services();
681
5b83683f
HY		 682 /*
683 * Now that EFI is in virtual mode, update the function
684 * pointers in the runtime service table to the new virtual addresses.
685 *
686 * Call EFI services through wrapper functions.
687 */
688 efi.get_time = virt_efi_get_time;
689 efi.set_time = virt_efi_set_time;
690 efi.get_wakeup_time = virt_efi_get_wakeup_time;
691 efi.set_wakeup_time = virt_efi_set_wakeup_time;
692 efi.get_variable = virt_efi_get_variable;
693 efi.get_next_variable = virt_efi_get_next_variable;
694 efi.set_variable = virt_efi_set_variable;
695 efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
696 efi.reset_system = virt_efi_reset_system;
2b5e8ef3 697 efi.set_virtual_address_map = NULL;
3b370237
MG		 698 efi.query_variable_info = virt_efi_query_variable_info;
699 efi.update_capsule = virt_efi_update_capsule;
700 efi.query_capsule_caps = virt_efi_query_capsule_caps;
4de0d4a6
HY		 701 if (__supported_pte_mask & _PAGE_NX)
702 runtime_code_page_mkexec();
a3828064
HY		 703 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
704 memmap.map = NULL;
7cb00b72 705 kfree(new_memmap);
5b83683f
HY		 706}
707
708/*
709 * Convenience functions to obtain memory types and attributes
710 */
711u32 efi_mem_type(unsigned long phys_addr)
712{
713 efi_memory_desc_t *md;
714 void *p;
715
716 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
717 md = p;
718 if ((md->phys_addr <= phys_addr) &&
719 (phys_addr < (md->phys_addr +
720 (md->num_pages << EFI_PAGE_SHIFT))))
721 return md->type;
722 }
723 return 0;
724}
725
726u64 efi_mem_attributes(unsigned long phys_addr)
727{
728 efi_memory_desc_t *md;
729 void *p;
730
731 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
732 md = p;
733 if ((md->phys_addr <= phys_addr) &&
734 (phys_addr < (md->phys_addr +
735 (md->num_pages << EFI_PAGE_SHIFT))))
736 return md->attribute;
737 }
738 return 0;
739}
Linux 6.x block layer and io_uring tree(s)