Commit | Line | Data |
---|---|---|
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 | ||
e3cb3f5a OJ |
29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
30 | ||
5b83683f HY |
31 | #include <linux/kernel.h> |
32 | #include <linux/init.h> | |
33 | #include <linux/efi.h> | |
2223af38 | 34 | #include <linux/efi-bgrt.h> |
69c60c88 | 35 | #include <linux/export.h> |
5b83683f | 36 | #include <linux/bootmem.h> |
0d01ff25 | 37 | #include <linux/slab.h> |
a9ce6bc1 | 38 | #include <linux/memblock.h> |
5b83683f HY |
39 | #include <linux/spinlock.h> |
40 | #include <linux/uaccess.h> | |
41 | #include <linux/time.h> | |
42 | #include <linux/io.h> | |
43 | #include <linux/reboot.h> | |
44 | #include <linux/bcd.h> | |
31ff2f20 | 45 | #include <linux/ucs2_string.h> |
5b83683f HY |
46 | |
47 | #include <asm/setup.h> | |
48 | #include <asm/efi.h> | |
49 | #include <asm/time.h> | |
a2172e25 HY |
50 | #include <asm/cacheflush.h> |
51 | #include <asm/tlbflush.h> | |
7bd867df | 52 | #include <asm/x86_init.h> |
3195ef59 | 53 | #include <asm/rtc.h> |
5b83683f HY |
54 | |
55 | #define EFI_DEBUG 1 | |
5b83683f | 56 | |
31ff2f20 MG |
57 | /* |
58 | * There's some additional metadata associated with each | |
59 | * variable. Intel's reference implementation is 60 bytes - bump that | |
60 | * to account for potential alignment constraints | |
61 | */ | |
62 | #define VAR_METADATA_SIZE 64 | |
63 | ||
d80603c9 JB |
64 | struct efi __read_mostly efi = { |
65 | .mps = EFI_INVALID_TABLE_ADDR, | |
66 | .acpi = EFI_INVALID_TABLE_ADDR, | |
67 | .acpi20 = EFI_INVALID_TABLE_ADDR, | |
68 | .smbios = EFI_INVALID_TABLE_ADDR, | |
69 | .sal_systab = EFI_INVALID_TABLE_ADDR, | |
70 | .boot_info = EFI_INVALID_TABLE_ADDR, | |
71 | .hcdp = EFI_INVALID_TABLE_ADDR, | |
72 | .uga = EFI_INVALID_TABLE_ADDR, | |
73 | .uv_systab = EFI_INVALID_TABLE_ADDR, | |
74 | }; | |
5b83683f HY |
75 | EXPORT_SYMBOL(efi); |
76 | ||
77 | struct efi_memory_map memmap; | |
78 | ||
ecaea42e | 79 | static struct efi efi_phys __initdata; |
5b83683f HY |
80 | static efi_system_table_t efi_systab __initdata; |
81 | ||
cc5a080c MG |
82 | static u64 efi_var_store_size; |
83 | static u64 efi_var_remaining_size; | |
84 | static u64 efi_var_max_var_size; | |
31ff2f20 MG |
85 | static u64 boot_used_size; |
86 | static u64 boot_var_size; | |
87 | static u64 active_size; | |
cc5a080c | 88 | |
83e68189 MF |
89 | unsigned long x86_efi_facility; |
90 | ||
91 | /* | |
92 | * Returns 1 if 'facility' is enabled, 0 otherwise. | |
93 | */ | |
94 | int efi_enabled(int facility) | |
95 | { | |
96 | return test_bit(facility, &x86_efi_facility) != 0; | |
5189c2a7 | 97 | } |
83e68189 | 98 | EXPORT_SYMBOL(efi_enabled); |
5189c2a7 | 99 | |
058e7b58 | 100 | static bool __initdata disable_runtime = false; |
8b2cb7a8 HY |
101 | static int __init setup_noefi(char *arg) |
102 | { | |
fb834c7a | 103 | disable_runtime = true; |
8b2cb7a8 HY |
104 | return 0; |
105 | } | |
106 | early_param("noefi", setup_noefi); | |
107 | ||
200001eb PJ |
108 | int add_efi_memmap; |
109 | EXPORT_SYMBOL(add_efi_memmap); | |
110 | ||
111 | static int __init setup_add_efi_memmap(char *arg) | |
112 | { | |
113 | add_efi_memmap = 1; | |
114 | return 0; | |
115 | } | |
116 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
117 | ||
8c58bf3e RW |
118 | static bool efi_no_storage_paranoia; |
119 | ||
120 | static int __init setup_storage_paranoia(char *arg) | |
121 | { | |
122 | efi_no_storage_paranoia = true; | |
123 | return 0; | |
124 | } | |
125 | early_param("efi_no_storage_paranoia", setup_storage_paranoia); | |
126 | ||
200001eb | 127 | |
5b83683f HY |
128 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
129 | { | |
ef68c8f8 JB |
130 | unsigned long flags; |
131 | efi_status_t status; | |
132 | ||
133 | spin_lock_irqsave(&rtc_lock, flags); | |
134 | status = efi_call_virt2(get_time, tm, tc); | |
135 | spin_unlock_irqrestore(&rtc_lock, flags); | |
136 | return status; | |
5b83683f HY |
137 | } |
138 | ||
139 | static efi_status_t virt_efi_set_time(efi_time_t *tm) | |
140 | { | |
ef68c8f8 JB |
141 | unsigned long flags; |
142 | efi_status_t status; | |
143 | ||
144 | spin_lock_irqsave(&rtc_lock, flags); | |
145 | status = efi_call_virt1(set_time, tm); | |
146 | spin_unlock_irqrestore(&rtc_lock, flags); | |
147 | return status; | |
5b83683f HY |
148 | } |
149 | ||
150 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, | |
151 | efi_bool_t *pending, | |
152 | efi_time_t *tm) | |
153 | { | |
ef68c8f8 JB |
154 | unsigned long flags; |
155 | efi_status_t status; | |
156 | ||
157 | spin_lock_irqsave(&rtc_lock, flags); | |
158 | status = efi_call_virt3(get_wakeup_time, | |
159 | enabled, pending, tm); | |
160 | spin_unlock_irqrestore(&rtc_lock, flags); | |
161 | return status; | |
5b83683f HY |
162 | } |
163 | ||
164 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
165 | { | |
ef68c8f8 JB |
166 | unsigned long flags; |
167 | efi_status_t status; | |
168 | ||
169 | spin_lock_irqsave(&rtc_lock, flags); | |
170 | status = efi_call_virt2(set_wakeup_time, | |
171 | enabled, tm); | |
172 | spin_unlock_irqrestore(&rtc_lock, flags); | |
173 | return status; | |
5b83683f HY |
174 | } |
175 | ||
176 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, | |
177 | efi_guid_t *vendor, | |
178 | u32 *attr, | |
179 | unsigned long *data_size, | |
180 | void *data) | |
181 | { | |
182 | return efi_call_virt5(get_variable, | |
183 | name, vendor, attr, | |
184 | data_size, data); | |
185 | } | |
186 | ||
187 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, | |
188 | efi_char16_t *name, | |
189 | efi_guid_t *vendor) | |
190 | { | |
31ff2f20 MG |
191 | efi_status_t status; |
192 | static bool finished = false; | |
193 | static u64 var_size; | |
194 | ||
195 | status = efi_call_virt3(get_next_variable, | |
196 | name_size, name, vendor); | |
197 | ||
198 | if (status == EFI_NOT_FOUND) { | |
199 | finished = true; | |
200 | if (var_size < boot_used_size) { | |
201 | boot_var_size = boot_used_size - var_size; | |
202 | active_size += boot_var_size; | |
203 | } else { | |
204 | printk(KERN_WARNING FW_BUG "efi: Inconsistent initial sizes\n"); | |
205 | } | |
206 | } | |
207 | ||
208 | if (boot_used_size && !finished) { | |
eccaf52f | 209 | unsigned long size = 0; |
31ff2f20 MG |
210 | u32 attr; |
211 | efi_status_t s; | |
212 | void *tmp; | |
213 | ||
214 | s = virt_efi_get_variable(name, vendor, &attr, &size, NULL); | |
215 | ||
216 | if (s != EFI_BUFFER_TOO_SMALL || !size) | |
217 | return status; | |
218 | ||
219 | tmp = kmalloc(size, GFP_ATOMIC); | |
220 | ||
221 | if (!tmp) | |
222 | return status; | |
223 | ||
224 | s = virt_efi_get_variable(name, vendor, &attr, &size, tmp); | |
225 | ||
226 | if (s == EFI_SUCCESS && (attr & EFI_VARIABLE_NON_VOLATILE)) { | |
227 | var_size += size; | |
228 | var_size += ucs2_strsize(name, 1024); | |
229 | active_size += size; | |
230 | active_size += VAR_METADATA_SIZE; | |
231 | active_size += ucs2_strsize(name, 1024); | |
232 | } | |
233 | ||
234 | kfree(tmp); | |
235 | } | |
236 | ||
237 | return status; | |
5b83683f HY |
238 | } |
239 | ||
240 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, | |
241 | efi_guid_t *vendor, | |
f7a2d73f | 242 | u32 attr, |
5b83683f HY |
243 | unsigned long data_size, |
244 | void *data) | |
245 | { | |
31ff2f20 MG |
246 | efi_status_t status; |
247 | u32 orig_attr = 0; | |
248 | unsigned long orig_size = 0; | |
249 | ||
250 | status = virt_efi_get_variable(name, vendor, &orig_attr, &orig_size, | |
251 | NULL); | |
252 | ||
253 | if (status != EFI_BUFFER_TOO_SMALL) | |
254 | orig_size = 0; | |
255 | ||
256 | status = efi_call_virt5(set_variable, | |
257 | name, vendor, attr, | |
258 | data_size, data); | |
259 | ||
260 | if (status == EFI_SUCCESS) { | |
261 | if (orig_size) { | |
262 | active_size -= orig_size; | |
263 | active_size -= ucs2_strsize(name, 1024); | |
264 | active_size -= VAR_METADATA_SIZE; | |
265 | } | |
266 | if (data_size) { | |
267 | active_size += data_size; | |
268 | active_size += ucs2_strsize(name, 1024); | |
269 | active_size += VAR_METADATA_SIZE; | |
270 | } | |
271 | } | |
272 | ||
273 | return status; | |
5b83683f HY |
274 | } |
275 | ||
3b370237 MG |
276 | static efi_status_t virt_efi_query_variable_info(u32 attr, |
277 | u64 *storage_space, | |
278 | u64 *remaining_space, | |
279 | u64 *max_variable_size) | |
280 | { | |
281 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
282 | return EFI_UNSUPPORTED; | |
283 | ||
284 | return efi_call_virt4(query_variable_info, attr, storage_space, | |
285 | remaining_space, max_variable_size); | |
286 | } | |
287 | ||
5b83683f HY |
288 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) |
289 | { | |
290 | return efi_call_virt1(get_next_high_mono_count, count); | |
291 | } | |
292 | ||
293 | static void virt_efi_reset_system(int reset_type, | |
294 | efi_status_t status, | |
295 | unsigned long data_size, | |
296 | efi_char16_t *data) | |
297 | { | |
298 | efi_call_virt4(reset_system, reset_type, status, | |
299 | data_size, data); | |
300 | } | |
301 | ||
3b370237 MG |
302 | static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, |
303 | unsigned long count, | |
304 | unsigned long sg_list) | |
305 | { | |
306 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
307 | return EFI_UNSUPPORTED; | |
308 | ||
309 | return efi_call_virt3(update_capsule, capsules, count, sg_list); | |
310 | } | |
311 | ||
312 | static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, | |
313 | unsigned long count, | |
314 | u64 *max_size, | |
315 | int *reset_type) | |
316 | { | |
317 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
318 | return EFI_UNSUPPORTED; | |
319 | ||
320 | return efi_call_virt4(query_capsule_caps, capsules, count, max_size, | |
321 | reset_type); | |
322 | } | |
323 | ||
5b83683f HY |
324 | static efi_status_t __init phys_efi_set_virtual_address_map( |
325 | unsigned long memory_map_size, | |
326 | unsigned long descriptor_size, | |
327 | u32 descriptor_version, | |
328 | efi_memory_desc_t *virtual_map) | |
329 | { | |
330 | efi_status_t status; | |
331 | ||
332 | efi_call_phys_prelog(); | |
333 | status = efi_call_phys4(efi_phys.set_virtual_address_map, | |
334 | memory_map_size, descriptor_size, | |
335 | descriptor_version, virtual_map); | |
336 | efi_call_phys_epilog(); | |
337 | return status; | |
338 | } | |
339 | ||
11520e5e LT |
340 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, |
341 | efi_time_cap_t *tc) | |
342 | { | |
343 | unsigned long flags; | |
344 | efi_status_t status; | |
345 | ||
346 | spin_lock_irqsave(&rtc_lock, flags); | |
347 | efi_call_phys_prelog(); | |
348 | status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), | |
349 | virt_to_phys(tc)); | |
350 | efi_call_phys_epilog(); | |
351 | spin_unlock_irqrestore(&rtc_lock, flags); | |
352 | return status; | |
353 | } | |
354 | ||
355 | int efi_set_rtc_mmss(unsigned long nowtime) | |
5b83683f | 356 | { |
5b83683f HY |
357 | efi_status_t status; |
358 | efi_time_t eft; | |
359 | efi_time_cap_t cap; | |
3195ef59 | 360 | struct rtc_time tm; |
5b83683f HY |
361 | |
362 | status = efi.get_time(&eft, &cap); | |
363 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 364 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
365 | return -1; |
366 | } | |
367 | ||
3195ef59 PB |
368 | rtc_time_to_tm(nowtime, &tm); |
369 | if (!rtc_valid_tm(&tm)) { | |
370 | eft.year = tm.tm_year + 1900; | |
371 | eft.month = tm.tm_mon + 1; | |
372 | eft.day = tm.tm_mday; | |
373 | eft.minute = tm.tm_min; | |
374 | eft.second = tm.tm_sec; | |
375 | eft.nanosecond = 0; | |
376 | } else { | |
377 | printk(KERN_ERR | |
378 | "%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n", | |
379 | __FUNCTION__, nowtime); | |
380 | return -1; | |
381 | } | |
5b83683f HY |
382 | |
383 | status = efi.set_time(&eft); | |
384 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 385 | pr_err("Oops: efitime: can't write time!\n"); |
5b83683f HY |
386 | return -1; |
387 | } | |
388 | return 0; | |
389 | } | |
390 | ||
11520e5e | 391 | unsigned long efi_get_time(void) |
5b83683f HY |
392 | { |
393 | efi_status_t status; | |
394 | efi_time_t eft; | |
395 | efi_time_cap_t cap; | |
396 | ||
397 | status = efi.get_time(&eft, &cap); | |
398 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 399 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
400 | |
401 | return mktime(eft.year, eft.month, eft.day, eft.hour, | |
402 | eft.minute, eft.second); | |
403 | } | |
404 | ||
69c91893 PJ |
405 | /* |
406 | * Tell the kernel about the EFI memory map. This might include | |
407 | * more than the max 128 entries that can fit in the e820 legacy | |
408 | * (zeropage) memory map. | |
409 | */ | |
410 | ||
200001eb | 411 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
412 | { |
413 | void *p; | |
414 | ||
415 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
416 | efi_memory_desc_t *md = p; | |
417 | unsigned long long start = md->phys_addr; | |
418 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
419 | int e820_type; | |
420 | ||
e2a71476 CW |
421 | switch (md->type) { |
422 | case EFI_LOADER_CODE: | |
423 | case EFI_LOADER_DATA: | |
424 | case EFI_BOOT_SERVICES_CODE: | |
425 | case EFI_BOOT_SERVICES_DATA: | |
426 | case EFI_CONVENTIONAL_MEMORY: | |
427 | if (md->attribute & EFI_MEMORY_WB) | |
428 | e820_type = E820_RAM; | |
429 | else | |
430 | e820_type = E820_RESERVED; | |
431 | break; | |
432 | case EFI_ACPI_RECLAIM_MEMORY: | |
433 | e820_type = E820_ACPI; | |
434 | break; | |
435 | case EFI_ACPI_MEMORY_NVS: | |
436 | e820_type = E820_NVS; | |
437 | break; | |
438 | case EFI_UNUSABLE_MEMORY: | |
439 | e820_type = E820_UNUSABLE; | |
440 | break; | |
441 | default: | |
442 | /* | |
443 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
444 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
445 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
446 | */ | |
69c91893 | 447 | e820_type = E820_RESERVED; |
e2a71476 CW |
448 | break; |
449 | } | |
d0be6bde | 450 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
451 | } |
452 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
453 | } | |
454 | ||
1adbfa35 | 455 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 456 | { |
15b9c359 | 457 | struct efi_info *e = &boot_params.efi_info; |
ecacf09f HY |
458 | unsigned long pmap; |
459 | ||
05486fa7 | 460 | #ifdef CONFIG_X86_32 |
1adbfa35 | 461 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 462 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
463 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
464 | return -EINVAL; | |
465 | } | |
15b9c359 | 466 | pmap = e->efi_memmap; |
05486fa7 | 467 | #else |
15b9c359 | 468 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 469 | #endif |
15b9c359 BP |
470 | memmap.phys_map = (void *)pmap; |
471 | memmap.nr_map = e->efi_memmap_size / | |
472 | e->efi_memdesc_size; | |
473 | memmap.desc_size = e->efi_memdesc_size; | |
474 | memmap.desc_version = e->efi_memdesc_version; | |
475 | ||
24aa0788 | 476 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 OJ |
477 | |
478 | return 0; | |
ecacf09f HY |
479 | } |
480 | ||
5b83683f HY |
481 | #if EFI_DEBUG |
482 | static void __init print_efi_memmap(void) | |
483 | { | |
484 | efi_memory_desc_t *md; | |
485 | void *p; | |
486 | int i; | |
487 | ||
488 | for (p = memmap.map, i = 0; | |
489 | p < memmap.map_end; | |
490 | p += memmap.desc_size, i++) { | |
491 | md = p; | |
e3cb3f5a | 492 | pr_info("mem%02u: type=%u, attr=0x%llx, " |
5b83683f HY |
493 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", |
494 | i, md->type, md->attribute, md->phys_addr, | |
495 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
496 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
497 | } | |
498 | } | |
499 | #endif /* EFI_DEBUG */ | |
500 | ||
916f676f MG |
501 | void __init efi_reserve_boot_services(void) |
502 | { | |
503 | void *p; | |
504 | ||
505 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
506 | efi_memory_desc_t *md = p; | |
7d68dc3f ML |
507 | u64 start = md->phys_addr; |
508 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
916f676f MG |
509 | |
510 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
511 | md->type != EFI_BOOT_SERVICES_DATA) | |
512 | continue; | |
7d68dc3f ML |
513 | /* Only reserve where possible: |
514 | * - Not within any already allocated areas | |
515 | * - Not over any memory area (really needed, if above?) | |
516 | * - Not within any part of the kernel | |
517 | * - Not the bios reserved area | |
518 | */ | |
fc8d7826 AD |
519 | if ((start+size >= __pa_symbol(_text) |
520 | && start <= __pa_symbol(_end)) || | |
7d68dc3f | 521 | !e820_all_mapped(start, start+size, E820_RAM) || |
bf61549a | 522 | memblock_is_region_reserved(start, size)) { |
7d68dc3f ML |
523 | /* Could not reserve, skip it */ |
524 | md->num_pages = 0; | |
e3cb3f5a | 525 | memblock_dbg("Could not reserve boot range " |
7d68dc3f ML |
526 | "[0x%010llx-0x%010llx]\n", |
527 | start, start+size-1); | |
528 | } else | |
24aa0788 | 529 | memblock_reserve(start, size); |
916f676f MG |
530 | } |
531 | } | |
532 | ||
5189c2a7 | 533 | void __init efi_unmap_memmap(void) |
78510792 | 534 | { |
83e68189 | 535 | clear_bit(EFI_MEMMAP, &x86_efi_facility); |
78510792 JT |
536 | if (memmap.map) { |
537 | early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); | |
538 | memmap.map = NULL; | |
539 | } | |
540 | } | |
541 | ||
542 | void __init efi_free_boot_services(void) | |
916f676f MG |
543 | { |
544 | void *p; | |
545 | ||
5189c2a7 | 546 | if (!efi_is_native()) |
78510792 JT |
547 | return; |
548 | ||
916f676f MG |
549 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
550 | efi_memory_desc_t *md = p; | |
551 | unsigned long long start = md->phys_addr; | |
552 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
553 | ||
554 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
555 | md->type != EFI_BOOT_SERVICES_DATA) | |
556 | continue; | |
557 | ||
7d68dc3f ML |
558 | /* Could not reserve boot area */ |
559 | if (!size) | |
560 | continue; | |
561 | ||
916f676f MG |
562 | free_bootmem_late(start, size); |
563 | } | |
78510792 JT |
564 | |
565 | efi_unmap_memmap(); | |
916f676f MG |
566 | } |
567 | ||
140bf275 | 568 | static int __init efi_systab_init(void *phys) |
5b83683f | 569 | { |
83e68189 | 570 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 OJ |
571 | efi_system_table_64_t *systab64; |
572 | u64 tmp = 0; | |
573 | ||
574 | systab64 = early_ioremap((unsigned long)phys, | |
575 | sizeof(*systab64)); | |
576 | if (systab64 == NULL) { | |
577 | pr_err("Couldn't map the system table!\n"); | |
578 | return -ENOMEM; | |
579 | } | |
580 | ||
581 | efi_systab.hdr = systab64->hdr; | |
582 | efi_systab.fw_vendor = systab64->fw_vendor; | |
583 | tmp |= systab64->fw_vendor; | |
584 | efi_systab.fw_revision = systab64->fw_revision; | |
585 | efi_systab.con_in_handle = systab64->con_in_handle; | |
586 | tmp |= systab64->con_in_handle; | |
587 | efi_systab.con_in = systab64->con_in; | |
588 | tmp |= systab64->con_in; | |
589 | efi_systab.con_out_handle = systab64->con_out_handle; | |
590 | tmp |= systab64->con_out_handle; | |
591 | efi_systab.con_out = systab64->con_out; | |
592 | tmp |= systab64->con_out; | |
593 | efi_systab.stderr_handle = systab64->stderr_handle; | |
594 | tmp |= systab64->stderr_handle; | |
595 | efi_systab.stderr = systab64->stderr; | |
596 | tmp |= systab64->stderr; | |
597 | efi_systab.runtime = (void *)(unsigned long)systab64->runtime; | |
598 | tmp |= systab64->runtime; | |
599 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; | |
600 | tmp |= systab64->boottime; | |
601 | efi_systab.nr_tables = systab64->nr_tables; | |
602 | efi_systab.tables = systab64->tables; | |
603 | tmp |= systab64->tables; | |
604 | ||
605 | early_iounmap(systab64, sizeof(*systab64)); | |
606 | #ifdef CONFIG_X86_32 | |
607 | if (tmp >> 32) { | |
608 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
609 | return -EINVAL; | |
610 | } | |
611 | #endif | |
612 | } else { | |
613 | efi_system_table_32_t *systab32; | |
614 | ||
615 | systab32 = early_ioremap((unsigned long)phys, | |
616 | sizeof(*systab32)); | |
617 | if (systab32 == NULL) { | |
618 | pr_err("Couldn't map the system table!\n"); | |
619 | return -ENOMEM; | |
620 | } | |
621 | ||
622 | efi_systab.hdr = systab32->hdr; | |
623 | efi_systab.fw_vendor = systab32->fw_vendor; | |
624 | efi_systab.fw_revision = systab32->fw_revision; | |
625 | efi_systab.con_in_handle = systab32->con_in_handle; | |
626 | efi_systab.con_in = systab32->con_in; | |
627 | efi_systab.con_out_handle = systab32->con_out_handle; | |
628 | efi_systab.con_out = systab32->con_out; | |
629 | efi_systab.stderr_handle = systab32->stderr_handle; | |
630 | efi_systab.stderr = systab32->stderr; | |
631 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
632 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
633 | efi_systab.nr_tables = systab32->nr_tables; | |
634 | efi_systab.tables = systab32->tables; | |
635 | ||
636 | early_iounmap(systab32, sizeof(*systab32)); | |
140bf275 | 637 | } |
1adbfa35 | 638 | |
5b83683f HY |
639 | efi.systab = &efi_systab; |
640 | ||
641 | /* | |
642 | * Verify the EFI Table | |
643 | */ | |
140bf275 | 644 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 645 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
646 | return -EINVAL; |
647 | } | |
5b83683f | 648 | if ((efi.systab->hdr.revision >> 16) == 0) |
e3cb3f5a | 649 | pr_err("Warning: System table version " |
5b83683f HY |
650 | "%d.%02d, expected 1.00 or greater!\n", |
651 | efi.systab->hdr.revision >> 16, | |
652 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
653 | |
654 | return 0; | |
83e7ee66 | 655 | } |
5b83683f | 656 | |
140bf275 | 657 | static int __init efi_config_init(u64 tables, int nr_tables) |
83e7ee66 | 658 | { |
1adbfa35 OJ |
659 | void *config_tables, *tablep; |
660 | int i, sz; | |
661 | ||
83e68189 | 662 | if (efi_enabled(EFI_64BIT)) |
1adbfa35 OJ |
663 | sz = sizeof(efi_config_table_64_t); |
664 | else | |
665 | sz = sizeof(efi_config_table_32_t); | |
5b83683f HY |
666 | |
667 | /* | |
668 | * Let's see what config tables the firmware passed to us. | |
669 | */ | |
1adbfa35 | 670 | config_tables = early_ioremap(tables, nr_tables * sz); |
140bf275 | 671 | if (config_tables == NULL) { |
e3cb3f5a | 672 | pr_err("Could not map Configuration table!\n"); |
140bf275 OJ |
673 | return -ENOMEM; |
674 | } | |
5b83683f | 675 | |
1adbfa35 | 676 | tablep = config_tables; |
e3cb3f5a | 677 | pr_info(""); |
5b83683f | 678 | for (i = 0; i < efi.systab->nr_tables; i++) { |
1adbfa35 OJ |
679 | efi_guid_t guid; |
680 | unsigned long table; | |
681 | ||
83e68189 | 682 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 OJ |
683 | u64 table64; |
684 | guid = ((efi_config_table_64_t *)tablep)->guid; | |
685 | table64 = ((efi_config_table_64_t *)tablep)->table; | |
686 | table = table64; | |
687 | #ifdef CONFIG_X86_32 | |
688 | if (table64 >> 32) { | |
689 | pr_cont("\n"); | |
690 | pr_err("Table located above 4GB, disabling EFI.\n"); | |
691 | early_iounmap(config_tables, | |
692 | efi.systab->nr_tables * sz); | |
693 | return -EINVAL; | |
694 | } | |
695 | #endif | |
696 | } else { | |
697 | guid = ((efi_config_table_32_t *)tablep)->guid; | |
698 | table = ((efi_config_table_32_t *)tablep)->table; | |
699 | } | |
a6a46f41 OJ |
700 | if (!efi_guidcmp(guid, MPS_TABLE_GUID)) { |
701 | efi.mps = table; | |
702 | pr_cont(" MPS=0x%lx ", table); | |
703 | } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) { | |
704 | efi.acpi20 = table; | |
705 | pr_cont(" ACPI 2.0=0x%lx ", table); | |
706 | } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) { | |
707 | efi.acpi = table; | |
708 | pr_cont(" ACPI=0x%lx ", table); | |
709 | } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) { | |
710 | efi.smbios = table; | |
711 | pr_cont(" SMBIOS=0x%lx ", table); | |
03b48632 | 712 | #ifdef CONFIG_X86_UV |
a6a46f41 OJ |
713 | } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) { |
714 | efi.uv_systab = table; | |
715 | pr_cont(" UVsystab=0x%lx ", table); | |
03b48632 | 716 | #endif |
a6a46f41 OJ |
717 | } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) { |
718 | efi.hcdp = table; | |
719 | pr_cont(" HCDP=0x%lx ", table); | |
720 | } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) { | |
721 | efi.uga = table; | |
722 | pr_cont(" UGA=0x%lx ", table); | |
5b83683f | 723 | } |
1adbfa35 | 724 | tablep += sz; |
5b83683f | 725 | } |
e3cb3f5a | 726 | pr_cont("\n"); |
a6a46f41 | 727 | early_iounmap(config_tables, efi.systab->nr_tables * sz); |
140bf275 | 728 | return 0; |
83e7ee66 OJ |
729 | } |
730 | ||
140bf275 | 731 | static int __init efi_runtime_init(void) |
83e7ee66 OJ |
732 | { |
733 | efi_runtime_services_t *runtime; | |
5b83683f HY |
734 | |
735 | /* | |
736 | * Check out the runtime services table. We need to map | |
737 | * the runtime services table so that we can grab the physical | |
738 | * address of several of the EFI runtime functions, needed to | |
739 | * set the firmware into virtual mode. | |
740 | */ | |
beacfaac HY |
741 | runtime = early_ioremap((unsigned long)efi.systab->runtime, |
742 | sizeof(efi_runtime_services_t)); | |
140bf275 | 743 | if (!runtime) { |
e3cb3f5a | 744 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
745 | return -ENOMEM; |
746 | } | |
747 | /* | |
748 | * We will only need *early* access to the following | |
11520e5e | 749 | * two EFI runtime services before set_virtual_address_map |
140bf275 OJ |
750 | * is invoked. |
751 | */ | |
11520e5e | 752 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; |
140bf275 OJ |
753 | efi_phys.set_virtual_address_map = |
754 | (efi_set_virtual_address_map_t *) | |
755 | runtime->set_virtual_address_map; | |
11520e5e LT |
756 | /* |
757 | * Make efi_get_time can be called before entering | |
758 | * virtual mode. | |
759 | */ | |
760 | efi.get_time = phys_efi_get_time; | |
beacfaac | 761 | early_iounmap(runtime, sizeof(efi_runtime_services_t)); |
140bf275 OJ |
762 | |
763 | return 0; | |
83e7ee66 | 764 | } |
5b83683f | 765 | |
140bf275 | 766 | static int __init efi_memmap_init(void) |
83e7ee66 | 767 | { |
5b83683f | 768 | /* Map the EFI memory map */ |
beacfaac HY |
769 | memmap.map = early_ioremap((unsigned long)memmap.phys_map, |
770 | memmap.nr_map * memmap.desc_size); | |
140bf275 | 771 | if (memmap.map == NULL) { |
e3cb3f5a | 772 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
773 | return -ENOMEM; |
774 | } | |
5b83683f | 775 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 776 | |
200001eb PJ |
777 | if (add_efi_memmap) |
778 | do_add_efi_memmap(); | |
140bf275 OJ |
779 | |
780 | return 0; | |
83e7ee66 OJ |
781 | } |
782 | ||
783 | void __init efi_init(void) | |
784 | { | |
785 | efi_char16_t *c16; | |
786 | char vendor[100] = "unknown"; | |
787 | int i = 0; | |
788 | void *tmp; | |
cc5a080c MG |
789 | struct setup_data *data; |
790 | struct efi_var_bootdata *efi_var_data; | |
791 | u64 pa_data; | |
83e7ee66 OJ |
792 | |
793 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
794 | if (boot_params.efi_info.efi_systab_hi || |
795 | boot_params.efi_info.efi_memmap_hi) { | |
796 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
797 | return; |
798 | } | |
83e7ee66 OJ |
799 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
800 | #else | |
801 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
802 | (boot_params.efi_info.efi_systab | |
803 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
804 | #endif |
805 | ||
83e68189 | 806 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 807 | return; |
83e68189 | 808 | |
cc5a080c MG |
809 | pa_data = boot_params.hdr.setup_data; |
810 | while (pa_data) { | |
811 | data = early_ioremap(pa_data, sizeof(*efi_var_data)); | |
812 | if (data->type == SETUP_EFI_VARS) { | |
813 | efi_var_data = (struct efi_var_bootdata *)data; | |
814 | ||
815 | efi_var_store_size = efi_var_data->store_size; | |
816 | efi_var_remaining_size = efi_var_data->remaining_size; | |
817 | efi_var_max_var_size = efi_var_data->max_var_size; | |
818 | } | |
819 | pa_data = data->next; | |
820 | early_iounmap(data, sizeof(*efi_var_data)); | |
821 | } | |
822 | ||
31ff2f20 MG |
823 | boot_used_size = efi_var_store_size - efi_var_remaining_size; |
824 | ||
83e68189 | 825 | set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility); |
83e7ee66 OJ |
826 | |
827 | /* | |
828 | * Show what we know for posterity | |
829 | */ | |
830 | c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); | |
831 | if (c16) { | |
832 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
833 | vendor[i] = *c16++; | |
834 | vendor[i] = '\0'; | |
835 | } else | |
e3cb3f5a | 836 | pr_err("Could not map the firmware vendor!\n"); |
83e7ee66 OJ |
837 | early_iounmap(tmp, 2); |
838 | ||
e3cb3f5a OJ |
839 | pr_info("EFI v%u.%.02u by %s\n", |
840 | efi.systab->hdr.revision >> 16, | |
841 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 842 | |
83e68189 | 843 | if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) |
140bf275 | 844 | return; |
83e68189 MF |
845 | |
846 | set_bit(EFI_CONFIG_TABLES, &x86_efi_facility); | |
83e7ee66 | 847 | |
1adbfa35 OJ |
848 | /* |
849 | * Note: We currently don't support runtime services on an EFI | |
850 | * that doesn't match the kernel 32/64-bit mode. | |
851 | */ | |
852 | ||
5189c2a7 | 853 | if (!efi_is_native()) |
1adbfa35 | 854 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 855 | else { |
fb834c7a | 856 | if (disable_runtime || efi_runtime_init()) |
83e68189 MF |
857 | return; |
858 | set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility); | |
140bf275 | 859 | } |
83e7ee66 | 860 | |
83e68189 | 861 | if (efi_memmap_init()) |
140bf275 | 862 | return; |
83e68189 MF |
863 | |
864 | set_bit(EFI_MEMMAP, &x86_efi_facility); | |
865 | ||
11520e5e | 866 | #ifdef CONFIG_X86_32 |
5189c2a7 | 867 | if (efi_is_native()) { |
1adbfa35 OJ |
868 | x86_platform.get_wallclock = efi_get_time; |
869 | x86_platform.set_wallclock = efi_set_rtc_mmss; | |
870 | } | |
11520e5e | 871 | #endif |
7bd867df | 872 | |
5b83683f HY |
873 | #if EFI_DEBUG |
874 | print_efi_memmap(); | |
875 | #endif | |
876 | } | |
877 | ||
2223af38 JT |
878 | void __init efi_late_init(void) |
879 | { | |
880 | efi_bgrt_init(); | |
881 | } | |
882 | ||
9cd2b07c MG |
883 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
884 | { | |
885 | u64 addr, npages; | |
886 | ||
887 | addr = md->virt_addr; | |
888 | npages = md->num_pages; | |
889 | ||
890 | memrange_efi_to_native(&addr, &npages); | |
891 | ||
892 | if (executable) | |
893 | set_memory_x(addr, npages); | |
894 | else | |
895 | set_memory_nx(addr, npages); | |
896 | } | |
897 | ||
a2172e25 HY |
898 | static void __init runtime_code_page_mkexec(void) |
899 | { | |
900 | efi_memory_desc_t *md; | |
a2172e25 HY |
901 | void *p; |
902 | ||
a2172e25 HY |
903 | /* Make EFI runtime service code area executable */ |
904 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
905 | md = p; | |
1c083eb2 HY |
906 | |
907 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
908 | continue; | |
909 | ||
9cd2b07c | 910 | efi_set_executable(md, true); |
a2172e25 | 911 | } |
a2172e25 | 912 | } |
a2172e25 | 913 | |
7bc90e01 JT |
914 | /* |
915 | * We can't ioremap data in EFI boot services RAM, because we've already mapped | |
916 | * it as RAM. So, look it up in the existing EFI memory map instead. Only | |
917 | * callable after efi_enter_virtual_mode and before efi_free_boot_services. | |
918 | */ | |
919 | void __iomem *efi_lookup_mapped_addr(u64 phys_addr) | |
920 | { | |
921 | void *p; | |
922 | if (WARN_ON(!memmap.map)) | |
923 | return NULL; | |
924 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
925 | efi_memory_desc_t *md = p; | |
926 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
927 | u64 end = md->phys_addr + size; | |
928 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && | |
929 | md->type != EFI_BOOT_SERVICES_CODE && | |
930 | md->type != EFI_BOOT_SERVICES_DATA) | |
931 | continue; | |
932 | if (!md->virt_addr) | |
933 | continue; | |
934 | if (phys_addr >= md->phys_addr && phys_addr < end) { | |
935 | phys_addr += md->virt_addr - md->phys_addr; | |
936 | return (__force void __iomem *)(unsigned long)phys_addr; | |
937 | } | |
938 | } | |
939 | return NULL; | |
940 | } | |
941 | ||
3e8fa263 MF |
942 | void efi_memory_uc(u64 addr, unsigned long size) |
943 | { | |
944 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
945 | u64 npages; | |
946 | ||
947 | npages = round_up(size, page_shift) / page_shift; | |
948 | memrange_efi_to_native(&addr, &npages); | |
949 | set_memory_uc(addr, npages); | |
950 | } | |
951 | ||
5b83683f HY |
952 | /* |
953 | * This function will switch the EFI runtime services to virtual mode. | |
954 | * Essentially, look through the EFI memmap and map every region that | |
955 | * has the runtime attribute bit set in its memory descriptor and update | |
956 | * that memory descriptor with the virtual address obtained from ioremap(). | |
957 | * This enables the runtime services to be called without having to | |
958 | * thunk back into physical mode for every invocation. | |
959 | */ | |
960 | void __init efi_enter_virtual_mode(void) | |
961 | { | |
202f9d0a | 962 | efi_memory_desc_t *md, *prev_md = NULL; |
5b83683f | 963 | efi_status_t status; |
1c083eb2 | 964 | unsigned long size; |
dda56e13 | 965 | u64 end, systab, start_pfn, end_pfn; |
7cb00b72 MG |
966 | void *p, *va, *new_memmap = NULL; |
967 | int count = 0; | |
5b83683f HY |
968 | |
969 | efi.systab = NULL; | |
202f9d0a | 970 | |
1adbfa35 OJ |
971 | /* |
972 | * We don't do virtual mode, since we don't do runtime services, on | |
973 | * non-native EFI | |
974 | */ | |
975 | ||
5189c2a7 | 976 | if (!efi_is_native()) { |
78510792 JT |
977 | efi_unmap_memmap(); |
978 | return; | |
979 | } | |
1adbfa35 | 980 | |
202f9d0a MG |
981 | /* Merge contiguous regions of the same type and attribute */ |
982 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
983 | u64 prev_size; | |
984 | md = p; | |
985 | ||
986 | if (!prev_md) { | |
987 | prev_md = md; | |
988 | continue; | |
989 | } | |
990 | ||
991 | if (prev_md->type != md->type || | |
992 | prev_md->attribute != md->attribute) { | |
993 | prev_md = md; | |
994 | continue; | |
995 | } | |
996 | ||
997 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
998 | ||
999 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
1000 | prev_md->num_pages += md->num_pages; | |
1001 | md->type = EFI_RESERVED_TYPE; | |
1002 | md->attribute = 0; | |
1003 | continue; | |
1004 | } | |
1005 | prev_md = md; | |
1006 | } | |
1007 | ||
5b83683f HY |
1008 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
1009 | md = p; | |
916f676f MG |
1010 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && |
1011 | md->type != EFI_BOOT_SERVICES_CODE && | |
1012 | md->type != EFI_BOOT_SERVICES_DATA) | |
5b83683f | 1013 | continue; |
1c083eb2 HY |
1014 | |
1015 | size = md->num_pages << EFI_PAGE_SHIFT; | |
1016 | end = md->phys_addr + size; | |
1017 | ||
dda56e13 | 1018 | start_pfn = PFN_DOWN(md->phys_addr); |
dd39ecf5 | 1019 | end_pfn = PFN_UP(end); |
dda56e13 | 1020 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { |
1c083eb2 | 1021 | va = __va(md->phys_addr); |
3e8fa263 MF |
1022 | |
1023 | if (!(md->attribute & EFI_MEMORY_WB)) | |
1024 | efi_memory_uc((u64)(unsigned long)va, size); | |
1025 | } else | |
1026 | va = efi_ioremap(md->phys_addr, size, | |
1027 | md->type, md->attribute); | |
1c083eb2 | 1028 | |
1c083eb2 HY |
1029 | md->virt_addr = (u64) (unsigned long) va; |
1030 | ||
1031 | if (!va) { | |
e3cb3f5a | 1032 | pr_err("ioremap of 0x%llX failed!\n", |
5b83683f | 1033 | (unsigned long long)md->phys_addr); |
1c083eb2 HY |
1034 | continue; |
1035 | } | |
1036 | ||
1037 | systab = (u64) (unsigned long) efi_phys.systab; | |
1038 | if (md->phys_addr <= systab && systab < end) { | |
1039 | systab += md->virt_addr - md->phys_addr; | |
1040 | efi.systab = (efi_system_table_t *) (unsigned long) systab; | |
1041 | } | |
7cb00b72 MG |
1042 | new_memmap = krealloc(new_memmap, |
1043 | (count + 1) * memmap.desc_size, | |
1044 | GFP_KERNEL); | |
1045 | memcpy(new_memmap + (count * memmap.desc_size), md, | |
1046 | memmap.desc_size); | |
1047 | count++; | |
5b83683f HY |
1048 | } |
1049 | ||
1050 | BUG_ON(!efi.systab); | |
1051 | ||
1052 | status = phys_efi_set_virtual_address_map( | |
7cb00b72 | 1053 | memmap.desc_size * count, |
5b83683f HY |
1054 | memmap.desc_size, |
1055 | memmap.desc_version, | |
7cb00b72 | 1056 | (efi_memory_desc_t *)__pa(new_memmap)); |
5b83683f HY |
1057 | |
1058 | if (status != EFI_SUCCESS) { | |
e3cb3f5a OJ |
1059 | pr_alert("Unable to switch EFI into virtual mode " |
1060 | "(status=%lx)!\n", status); | |
5b83683f HY |
1061 | panic("EFI call to SetVirtualAddressMap() failed!"); |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * Now that EFI is in virtual mode, update the function | |
1066 | * pointers in the runtime service table to the new virtual addresses. | |
1067 | * | |
1068 | * Call EFI services through wrapper functions. | |
1069 | */ | |
712ba9e9 | 1070 | efi.runtime_version = efi_systab.hdr.revision; |
5b83683f HY |
1071 | efi.get_time = virt_efi_get_time; |
1072 | efi.set_time = virt_efi_set_time; | |
1073 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
1074 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
1075 | efi.get_variable = virt_efi_get_variable; | |
1076 | efi.get_next_variable = virt_efi_get_next_variable; | |
1077 | efi.set_variable = virt_efi_set_variable; | |
1078 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
1079 | efi.reset_system = virt_efi_reset_system; | |
2b5e8ef3 | 1080 | efi.set_virtual_address_map = NULL; |
3b370237 MG |
1081 | efi.query_variable_info = virt_efi_query_variable_info; |
1082 | efi.update_capsule = virt_efi_update_capsule; | |
1083 | efi.query_capsule_caps = virt_efi_query_capsule_caps; | |
4de0d4a6 HY |
1084 | if (__supported_pte_mask & _PAGE_NX) |
1085 | runtime_code_page_mkexec(); | |
1adbfa35 | 1086 | |
7cb00b72 | 1087 | kfree(new_memmap); |
5b83683f HY |
1088 | } |
1089 | ||
1090 | /* | |
1091 | * Convenience functions to obtain memory types and attributes | |
1092 | */ | |
1093 | u32 efi_mem_type(unsigned long phys_addr) | |
1094 | { | |
1095 | efi_memory_desc_t *md; | |
1096 | void *p; | |
1097 | ||
83e68189 MF |
1098 | if (!efi_enabled(EFI_MEMMAP)) |
1099 | return 0; | |
1100 | ||
5b83683f HY |
1101 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
1102 | md = p; | |
1103 | if ((md->phys_addr <= phys_addr) && | |
1104 | (phys_addr < (md->phys_addr + | |
1105 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
1106 | return md->type; | |
1107 | } | |
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | u64 efi_mem_attributes(unsigned long phys_addr) | |
1112 | { | |
1113 | efi_memory_desc_t *md; | |
1114 | void *p; | |
1115 | ||
1116 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
1117 | md = p; | |
1118 | if ((md->phys_addr <= phys_addr) && | |
1119 | (phys_addr < (md->phys_addr + | |
1120 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
1121 | return md->attribute; | |
1122 | } | |
1123 | return 0; | |
1124 | } | |
a6e4d5a0 MF |
1125 | |
1126 | /* | |
1127 | * Some firmware has serious problems when using more than 50% of the EFI | |
1128 | * variable store, i.e. it triggers bugs that can brick machines. Ensure that | |
1129 | * we never use more than this safe limit. | |
1130 | * | |
1131 | * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable | |
1132 | * store. | |
1133 | */ | |
1134 | efi_status_t efi_query_variable_store(u32 attributes, unsigned long size) | |
1135 | { | |
1136 | efi_status_t status; | |
1137 | u64 storage_size, remaining_size, max_size; | |
1138 | ||
1139 | status = efi.query_variable_info(attributes, &storage_size, | |
1140 | &remaining_size, &max_size); | |
1141 | if (status != EFI_SUCCESS) | |
1142 | return status; | |
1143 | ||
7791c842 RW |
1144 | if (!max_size && remaining_size > size) |
1145 | printk_once(KERN_ERR FW_BUG "Broken EFI implementation" | |
1146 | " is returning MaxVariableSize=0\n"); | |
31ff2f20 MG |
1147 | /* |
1148 | * Some firmware implementations refuse to boot if there's insufficient | |
1149 | * space in the variable store. We account for that by refusing the | |
1150 | * write if permitting it would reduce the available space to under | |
1151 | * 50%. However, some firmware won't reclaim variable space until | |
1152 | * after the used (not merely the actively used) space drops below | |
1153 | * a threshold. We can approximate that case with the value calculated | |
1154 | * above. If both the firmware and our calculations indicate that the | |
1155 | * available space would drop below 50%, refuse the write. | |
1156 | */ | |
7791c842 RW |
1157 | |
1158 | if (!storage_size || size > remaining_size || | |
8c58bf3e RW |
1159 | (max_size && size > max_size)) |
1160 | return EFI_OUT_OF_RESOURCES; | |
1161 | ||
1162 | if (!efi_no_storage_paranoia && | |
31ff2f20 MG |
1163 | ((active_size + size + VAR_METADATA_SIZE > storage_size / 2) && |
1164 | (remaining_size - size < storage_size / 2))) | |
a6e4d5a0 MF |
1165 | return EFI_OUT_OF_RESOURCES; |
1166 | ||
1167 | return EFI_SUCCESS; | |
1168 | } | |
3668011d | 1169 | EXPORT_SYMBOL_GPL(efi_query_variable_store); |