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Commit | Line | Data |
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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> | |
d2f7cbe7 BP |
15 | * Copyright (C) 2013 SuSE Labs |
16 | * Borislav Petkov <bp@suse.de> - runtime services VA mapping | |
5b83683f HY |
17 | * |
18 | * Copied from efi_32.c to eliminate the duplicated code between EFI | |
19 | * 32/64 support code. --ying 2007-10-26 | |
20 | * | |
21 | * All EFI Runtime Services are not implemented yet as EFI only | |
22 | * supports physical mode addressing on SoftSDV. This is to be fixed | |
23 | * in a future version. --drummond 1999-07-20 | |
24 | * | |
25 | * Implemented EFI runtime services and virtual mode calls. --davidm | |
26 | * | |
27 | * Goutham Rao: <goutham.rao@intel.com> | |
28 | * Skip non-WB memory and ignore empty memory ranges. | |
29 | */ | |
30 | ||
e3cb3f5a OJ |
31 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
32 | ||
5b83683f HY |
33 | #include <linux/kernel.h> |
34 | #include <linux/init.h> | |
35 | #include <linux/efi.h> | |
2223af38 | 36 | #include <linux/efi-bgrt.h> |
69c60c88 | 37 | #include <linux/export.h> |
5b83683f | 38 | #include <linux/bootmem.h> |
0d01ff25 | 39 | #include <linux/slab.h> |
a9ce6bc1 | 40 | #include <linux/memblock.h> |
5b83683f HY |
41 | #include <linux/spinlock.h> |
42 | #include <linux/uaccess.h> | |
43 | #include <linux/time.h> | |
44 | #include <linux/io.h> | |
45 | #include <linux/reboot.h> | |
46 | #include <linux/bcd.h> | |
47 | ||
48 | #include <asm/setup.h> | |
49 | #include <asm/efi.h> | |
50 | #include <asm/time.h> | |
a2172e25 HY |
51 | #include <asm/cacheflush.h> |
52 | #include <asm/tlbflush.h> | |
7bd867df | 53 | #include <asm/x86_init.h> |
3195ef59 | 54 | #include <asm/rtc.h> |
5b83683f | 55 | |
f4fccac0 | 56 | #define EFI_DEBUG |
5b83683f | 57 | |
f8b84043 MG |
58 | #define EFI_MIN_RESERVE 5120 |
59 | ||
60 | #define EFI_DUMMY_GUID \ | |
61 | EFI_GUID(0x4424ac57, 0xbe4b, 0x47dd, 0x9e, 0x97, 0xed, 0x50, 0xf0, 0x9f, 0x92, 0xa9) | |
62 | ||
63 | static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 }; | |
31ff2f20 | 64 | |
5b83683f HY |
65 | struct efi_memory_map memmap; |
66 | ||
ecaea42e | 67 | static struct efi efi_phys __initdata; |
5b83683f HY |
68 | static efi_system_table_t efi_systab __initdata; |
69 | ||
83e68189 MF |
70 | unsigned long x86_efi_facility; |
71 | ||
272686bf LL |
72 | static __initdata efi_config_table_type_t arch_tables[] = { |
73 | #ifdef CONFIG_X86_UV | |
74 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, | |
75 | #endif | |
722da9d2 | 76 | {NULL_GUID, NULL, NULL}, |
272686bf LL |
77 | }; |
78 | ||
1fec0533 | 79 | u64 efi_setup; /* efi setup_data physical address */ |
926172d4 | 80 | |
83e68189 MF |
81 | /* |
82 | * Returns 1 if 'facility' is enabled, 0 otherwise. | |
83 | */ | |
84 | int efi_enabled(int facility) | |
85 | { | |
86 | return test_bit(facility, &x86_efi_facility) != 0; | |
5189c2a7 | 87 | } |
83e68189 | 88 | EXPORT_SYMBOL(efi_enabled); |
5189c2a7 | 89 | |
058e7b58 | 90 | static bool __initdata disable_runtime = false; |
8b2cb7a8 HY |
91 | static int __init setup_noefi(char *arg) |
92 | { | |
fb834c7a | 93 | disable_runtime = true; |
8b2cb7a8 HY |
94 | return 0; |
95 | } | |
96 | early_param("noefi", setup_noefi); | |
97 | ||
200001eb PJ |
98 | int add_efi_memmap; |
99 | EXPORT_SYMBOL(add_efi_memmap); | |
100 | ||
101 | static int __init setup_add_efi_memmap(char *arg) | |
102 | { | |
103 | add_efi_memmap = 1; | |
104 | return 0; | |
105 | } | |
106 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
107 | ||
8c58bf3e RW |
108 | static bool efi_no_storage_paranoia; |
109 | ||
110 | static int __init setup_storage_paranoia(char *arg) | |
111 | { | |
112 | efi_no_storage_paranoia = true; | |
113 | return 0; | |
114 | } | |
115 | early_param("efi_no_storage_paranoia", setup_storage_paranoia); | |
116 | ||
5b83683f HY |
117 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
118 | { | |
ef68c8f8 JB |
119 | unsigned long flags; |
120 | efi_status_t status; | |
121 | ||
122 | spin_lock_irqsave(&rtc_lock, flags); | |
123 | status = efi_call_virt2(get_time, tm, tc); | |
124 | spin_unlock_irqrestore(&rtc_lock, flags); | |
125 | return status; | |
5b83683f HY |
126 | } |
127 | ||
128 | static efi_status_t virt_efi_set_time(efi_time_t *tm) | |
129 | { | |
ef68c8f8 JB |
130 | unsigned long flags; |
131 | efi_status_t status; | |
132 | ||
133 | spin_lock_irqsave(&rtc_lock, flags); | |
134 | status = efi_call_virt1(set_time, tm); | |
135 | spin_unlock_irqrestore(&rtc_lock, flags); | |
136 | return status; | |
5b83683f HY |
137 | } |
138 | ||
139 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, | |
140 | efi_bool_t *pending, | |
141 | efi_time_t *tm) | |
142 | { | |
ef68c8f8 JB |
143 | unsigned long flags; |
144 | efi_status_t status; | |
145 | ||
146 | spin_lock_irqsave(&rtc_lock, flags); | |
147 | status = efi_call_virt3(get_wakeup_time, | |
148 | enabled, pending, tm); | |
149 | spin_unlock_irqrestore(&rtc_lock, flags); | |
150 | return status; | |
5b83683f HY |
151 | } |
152 | ||
153 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
154 | { | |
ef68c8f8 JB |
155 | unsigned long flags; |
156 | efi_status_t status; | |
157 | ||
158 | spin_lock_irqsave(&rtc_lock, flags); | |
159 | status = efi_call_virt2(set_wakeup_time, | |
160 | enabled, tm); | |
161 | spin_unlock_irqrestore(&rtc_lock, flags); | |
162 | return status; | |
5b83683f HY |
163 | } |
164 | ||
165 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, | |
166 | efi_guid_t *vendor, | |
167 | u32 *attr, | |
168 | unsigned long *data_size, | |
169 | void *data) | |
170 | { | |
171 | return efi_call_virt5(get_variable, | |
172 | name, vendor, attr, | |
173 | data_size, data); | |
174 | } | |
175 | ||
176 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, | |
177 | efi_char16_t *name, | |
178 | efi_guid_t *vendor) | |
179 | { | |
f8b84043 MG |
180 | return efi_call_virt3(get_next_variable, |
181 | name_size, name, vendor); | |
5b83683f HY |
182 | } |
183 | ||
184 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, | |
185 | efi_guid_t *vendor, | |
f7a2d73f | 186 | u32 attr, |
5b83683f HY |
187 | unsigned long data_size, |
188 | void *data) | |
189 | { | |
f8b84043 MG |
190 | return efi_call_virt5(set_variable, |
191 | name, vendor, attr, | |
192 | data_size, data); | |
5b83683f HY |
193 | } |
194 | ||
3b370237 MG |
195 | static efi_status_t virt_efi_query_variable_info(u32 attr, |
196 | u64 *storage_space, | |
197 | u64 *remaining_space, | |
198 | u64 *max_variable_size) | |
199 | { | |
200 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
201 | return EFI_UNSUPPORTED; | |
202 | ||
203 | return efi_call_virt4(query_variable_info, attr, storage_space, | |
204 | remaining_space, max_variable_size); | |
205 | } | |
206 | ||
5b83683f HY |
207 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) |
208 | { | |
209 | return efi_call_virt1(get_next_high_mono_count, count); | |
210 | } | |
211 | ||
212 | static void virt_efi_reset_system(int reset_type, | |
213 | efi_status_t status, | |
214 | unsigned long data_size, | |
215 | efi_char16_t *data) | |
216 | { | |
217 | efi_call_virt4(reset_system, reset_type, status, | |
218 | data_size, data); | |
219 | } | |
220 | ||
3b370237 MG |
221 | static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, |
222 | unsigned long count, | |
223 | unsigned long sg_list) | |
224 | { | |
225 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
226 | return EFI_UNSUPPORTED; | |
227 | ||
228 | return efi_call_virt3(update_capsule, capsules, count, sg_list); | |
229 | } | |
230 | ||
231 | static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, | |
232 | unsigned long count, | |
233 | u64 *max_size, | |
234 | int *reset_type) | |
235 | { | |
236 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
237 | return EFI_UNSUPPORTED; | |
238 | ||
239 | return efi_call_virt4(query_capsule_caps, capsules, count, max_size, | |
240 | reset_type); | |
241 | } | |
242 | ||
5b83683f HY |
243 | static efi_status_t __init phys_efi_set_virtual_address_map( |
244 | unsigned long memory_map_size, | |
245 | unsigned long descriptor_size, | |
246 | u32 descriptor_version, | |
247 | efi_memory_desc_t *virtual_map) | |
248 | { | |
249 | efi_status_t status; | |
250 | ||
251 | efi_call_phys_prelog(); | |
252 | status = efi_call_phys4(efi_phys.set_virtual_address_map, | |
253 | memory_map_size, descriptor_size, | |
254 | descriptor_version, virtual_map); | |
255 | efi_call_phys_epilog(); | |
256 | return status; | |
257 | } | |
258 | ||
11520e5e LT |
259 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, |
260 | efi_time_cap_t *tc) | |
261 | { | |
262 | unsigned long flags; | |
263 | efi_status_t status; | |
264 | ||
265 | spin_lock_irqsave(&rtc_lock, flags); | |
266 | efi_call_phys_prelog(); | |
267 | status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), | |
268 | virt_to_phys(tc)); | |
269 | efi_call_phys_epilog(); | |
270 | spin_unlock_irqrestore(&rtc_lock, flags); | |
271 | return status; | |
272 | } | |
273 | ||
3565184e | 274 | int efi_set_rtc_mmss(const struct timespec *now) |
5b83683f | 275 | { |
3565184e | 276 | unsigned long nowtime = now->tv_sec; |
5b83683f HY |
277 | efi_status_t status; |
278 | efi_time_t eft; | |
279 | efi_time_cap_t cap; | |
3195ef59 | 280 | struct rtc_time tm; |
5b83683f HY |
281 | |
282 | status = efi.get_time(&eft, &cap); | |
283 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 284 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
285 | return -1; |
286 | } | |
287 | ||
3195ef59 PB |
288 | rtc_time_to_tm(nowtime, &tm); |
289 | if (!rtc_valid_tm(&tm)) { | |
290 | eft.year = tm.tm_year + 1900; | |
291 | eft.month = tm.tm_mon + 1; | |
292 | eft.day = tm.tm_mday; | |
293 | eft.minute = tm.tm_min; | |
294 | eft.second = tm.tm_sec; | |
295 | eft.nanosecond = 0; | |
296 | } else { | |
297 | printk(KERN_ERR | |
298 | "%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n", | |
299 | __FUNCTION__, nowtime); | |
300 | return -1; | |
301 | } | |
5b83683f HY |
302 | |
303 | status = efi.set_time(&eft); | |
304 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 305 | pr_err("Oops: efitime: can't write time!\n"); |
5b83683f HY |
306 | return -1; |
307 | } | |
308 | return 0; | |
309 | } | |
310 | ||
3565184e | 311 | void efi_get_time(struct timespec *now) |
5b83683f HY |
312 | { |
313 | efi_status_t status; | |
314 | efi_time_t eft; | |
315 | efi_time_cap_t cap; | |
316 | ||
317 | status = efi.get_time(&eft, &cap); | |
318 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 319 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f | 320 | |
3565184e DV |
321 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
322 | eft.minute, eft.second); | |
323 | now->tv_nsec = 0; | |
5b83683f HY |
324 | } |
325 | ||
69c91893 PJ |
326 | /* |
327 | * Tell the kernel about the EFI memory map. This might include | |
328 | * more than the max 128 entries that can fit in the e820 legacy | |
329 | * (zeropage) memory map. | |
330 | */ | |
331 | ||
200001eb | 332 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
333 | { |
334 | void *p; | |
335 | ||
336 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
337 | efi_memory_desc_t *md = p; | |
338 | unsigned long long start = md->phys_addr; | |
339 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
340 | int e820_type; | |
341 | ||
e2a71476 CW |
342 | switch (md->type) { |
343 | case EFI_LOADER_CODE: | |
344 | case EFI_LOADER_DATA: | |
345 | case EFI_BOOT_SERVICES_CODE: | |
346 | case EFI_BOOT_SERVICES_DATA: | |
347 | case EFI_CONVENTIONAL_MEMORY: | |
348 | if (md->attribute & EFI_MEMORY_WB) | |
349 | e820_type = E820_RAM; | |
350 | else | |
351 | e820_type = E820_RESERVED; | |
352 | break; | |
353 | case EFI_ACPI_RECLAIM_MEMORY: | |
354 | e820_type = E820_ACPI; | |
355 | break; | |
356 | case EFI_ACPI_MEMORY_NVS: | |
357 | e820_type = E820_NVS; | |
358 | break; | |
359 | case EFI_UNUSABLE_MEMORY: | |
360 | e820_type = E820_UNUSABLE; | |
361 | break; | |
362 | default: | |
363 | /* | |
364 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
365 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
366 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
367 | */ | |
69c91893 | 368 | e820_type = E820_RESERVED; |
e2a71476 CW |
369 | break; |
370 | } | |
d0be6bde | 371 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
372 | } |
373 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
374 | } | |
375 | ||
1adbfa35 | 376 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 377 | { |
15b9c359 | 378 | struct efi_info *e = &boot_params.efi_info; |
ecacf09f HY |
379 | unsigned long pmap; |
380 | ||
05486fa7 | 381 | #ifdef CONFIG_X86_32 |
1adbfa35 | 382 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 383 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
384 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
385 | return -EINVAL; | |
386 | } | |
15b9c359 | 387 | pmap = e->efi_memmap; |
05486fa7 | 388 | #else |
15b9c359 | 389 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 390 | #endif |
15b9c359 BP |
391 | memmap.phys_map = (void *)pmap; |
392 | memmap.nr_map = e->efi_memmap_size / | |
393 | e->efi_memdesc_size; | |
394 | memmap.desc_size = e->efi_memdesc_size; | |
395 | memmap.desc_version = e->efi_memdesc_version; | |
396 | ||
24aa0788 | 397 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 | 398 | |
258f6fd7 LL |
399 | efi.memmap = &memmap; |
400 | ||
1adbfa35 | 401 | return 0; |
ecacf09f HY |
402 | } |
403 | ||
5b83683f HY |
404 | static void __init print_efi_memmap(void) |
405 | { | |
f4fccac0 | 406 | #ifdef EFI_DEBUG |
5b83683f HY |
407 | efi_memory_desc_t *md; |
408 | void *p; | |
409 | int i; | |
410 | ||
411 | for (p = memmap.map, i = 0; | |
412 | p < memmap.map_end; | |
413 | p += memmap.desc_size, i++) { | |
414 | md = p; | |
e3cb3f5a | 415 | pr_info("mem%02u: type=%u, attr=0x%llx, " |
5b83683f HY |
416 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", |
417 | i, md->type, md->attribute, md->phys_addr, | |
418 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
419 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
420 | } | |
5b83683f | 421 | #endif /* EFI_DEBUG */ |
f4fccac0 | 422 | } |
5b83683f | 423 | |
916f676f MG |
424 | void __init efi_reserve_boot_services(void) |
425 | { | |
426 | void *p; | |
427 | ||
428 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
429 | efi_memory_desc_t *md = p; | |
7d68dc3f ML |
430 | u64 start = md->phys_addr; |
431 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
916f676f MG |
432 | |
433 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
434 | md->type != EFI_BOOT_SERVICES_DATA) | |
435 | continue; | |
7d68dc3f ML |
436 | /* Only reserve where possible: |
437 | * - Not within any already allocated areas | |
438 | * - Not over any memory area (really needed, if above?) | |
439 | * - Not within any part of the kernel | |
440 | * - Not the bios reserved area | |
441 | */ | |
a7f84f03 | 442 | if ((start + size > __pa_symbol(_text) |
fc8d7826 | 443 | && start <= __pa_symbol(_end)) || |
7d68dc3f | 444 | !e820_all_mapped(start, start+size, E820_RAM) || |
bf61549a | 445 | memblock_is_region_reserved(start, size)) { |
7d68dc3f ML |
446 | /* Could not reserve, skip it */ |
447 | md->num_pages = 0; | |
e3cb3f5a | 448 | memblock_dbg("Could not reserve boot range " |
7d68dc3f ML |
449 | "[0x%010llx-0x%010llx]\n", |
450 | start, start+size-1); | |
451 | } else | |
24aa0788 | 452 | memblock_reserve(start, size); |
916f676f MG |
453 | } |
454 | } | |
455 | ||
5189c2a7 | 456 | void __init efi_unmap_memmap(void) |
78510792 | 457 | { |
83e68189 | 458 | clear_bit(EFI_MEMMAP, &x86_efi_facility); |
78510792 JT |
459 | if (memmap.map) { |
460 | early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); | |
461 | memmap.map = NULL; | |
462 | } | |
463 | } | |
464 | ||
465 | void __init efi_free_boot_services(void) | |
916f676f MG |
466 | { |
467 | void *p; | |
468 | ||
5189c2a7 | 469 | if (!efi_is_native()) |
78510792 JT |
470 | return; |
471 | ||
916f676f MG |
472 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
473 | efi_memory_desc_t *md = p; | |
474 | unsigned long long start = md->phys_addr; | |
475 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
476 | ||
477 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
478 | md->type != EFI_BOOT_SERVICES_DATA) | |
479 | continue; | |
480 | ||
7d68dc3f ML |
481 | /* Could not reserve boot area */ |
482 | if (!size) | |
483 | continue; | |
484 | ||
916f676f MG |
485 | free_bootmem_late(start, size); |
486 | } | |
78510792 JT |
487 | |
488 | efi_unmap_memmap(); | |
916f676f MG |
489 | } |
490 | ||
140bf275 | 491 | static int __init efi_systab_init(void *phys) |
5b83683f | 492 | { |
83e68189 | 493 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 494 | efi_system_table_64_t *systab64; |
1fec0533 | 495 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
496 | u64 tmp = 0; |
497 | ||
1fec0533 DY |
498 | if (efi_setup) { |
499 | data = early_memremap(efi_setup, sizeof(*data)); | |
500 | if (!data) | |
501 | return -ENOMEM; | |
502 | } | |
1adbfa35 OJ |
503 | systab64 = early_ioremap((unsigned long)phys, |
504 | sizeof(*systab64)); | |
505 | if (systab64 == NULL) { | |
506 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 DY |
507 | if (data) |
508 | early_iounmap(data, sizeof(*data)); | |
1adbfa35 OJ |
509 | return -ENOMEM; |
510 | } | |
511 | ||
512 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
513 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
514 | systab64->fw_vendor; | |
515 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
516 | efi_systab.fw_revision = systab64->fw_revision; |
517 | efi_systab.con_in_handle = systab64->con_in_handle; | |
518 | tmp |= systab64->con_in_handle; | |
519 | efi_systab.con_in = systab64->con_in; | |
520 | tmp |= systab64->con_in; | |
521 | efi_systab.con_out_handle = systab64->con_out_handle; | |
522 | tmp |= systab64->con_out_handle; | |
523 | efi_systab.con_out = systab64->con_out; | |
524 | tmp |= systab64->con_out; | |
525 | efi_systab.stderr_handle = systab64->stderr_handle; | |
526 | tmp |= systab64->stderr_handle; | |
527 | efi_systab.stderr = systab64->stderr; | |
528 | tmp |= systab64->stderr; | |
1fec0533 DY |
529 | efi_systab.runtime = data ? |
530 | (void *)(unsigned long)data->runtime : | |
531 | (void *)(unsigned long)systab64->runtime; | |
532 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
533 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
534 | tmp |= systab64->boottime; | |
535 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
536 | efi_systab.tables = data ? (unsigned long)data->tables : |
537 | systab64->tables; | |
538 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 OJ |
539 | |
540 | early_iounmap(systab64, sizeof(*systab64)); | |
1fec0533 DY |
541 | if (data) |
542 | early_iounmap(data, sizeof(*data)); | |
1adbfa35 OJ |
543 | #ifdef CONFIG_X86_32 |
544 | if (tmp >> 32) { | |
545 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
546 | return -EINVAL; | |
547 | } | |
548 | #endif | |
549 | } else { | |
550 | efi_system_table_32_t *systab32; | |
551 | ||
552 | systab32 = early_ioremap((unsigned long)phys, | |
553 | sizeof(*systab32)); | |
554 | if (systab32 == NULL) { | |
555 | pr_err("Couldn't map the system table!\n"); | |
556 | return -ENOMEM; | |
557 | } | |
558 | ||
559 | efi_systab.hdr = systab32->hdr; | |
560 | efi_systab.fw_vendor = systab32->fw_vendor; | |
561 | efi_systab.fw_revision = systab32->fw_revision; | |
562 | efi_systab.con_in_handle = systab32->con_in_handle; | |
563 | efi_systab.con_in = systab32->con_in; | |
564 | efi_systab.con_out_handle = systab32->con_out_handle; | |
565 | efi_systab.con_out = systab32->con_out; | |
566 | efi_systab.stderr_handle = systab32->stderr_handle; | |
567 | efi_systab.stderr = systab32->stderr; | |
568 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
569 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
570 | efi_systab.nr_tables = systab32->nr_tables; | |
571 | efi_systab.tables = systab32->tables; | |
572 | ||
573 | early_iounmap(systab32, sizeof(*systab32)); | |
140bf275 | 574 | } |
1adbfa35 | 575 | |
5b83683f HY |
576 | efi.systab = &efi_systab; |
577 | ||
578 | /* | |
579 | * Verify the EFI Table | |
580 | */ | |
140bf275 | 581 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 582 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
583 | return -EINVAL; |
584 | } | |
5b83683f | 585 | if ((efi.systab->hdr.revision >> 16) == 0) |
e3cb3f5a | 586 | pr_err("Warning: System table version " |
5b83683f HY |
587 | "%d.%02d, expected 1.00 or greater!\n", |
588 | efi.systab->hdr.revision >> 16, | |
589 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
590 | |
591 | return 0; | |
83e7ee66 | 592 | } |
5b83683f | 593 | |
140bf275 | 594 | static int __init efi_runtime_init(void) |
83e7ee66 OJ |
595 | { |
596 | efi_runtime_services_t *runtime; | |
5b83683f HY |
597 | |
598 | /* | |
599 | * Check out the runtime services table. We need to map | |
600 | * the runtime services table so that we can grab the physical | |
601 | * address of several of the EFI runtime functions, needed to | |
602 | * set the firmware into virtual mode. | |
603 | */ | |
beacfaac HY |
604 | runtime = early_ioremap((unsigned long)efi.systab->runtime, |
605 | sizeof(efi_runtime_services_t)); | |
140bf275 | 606 | if (!runtime) { |
e3cb3f5a | 607 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
608 | return -ENOMEM; |
609 | } | |
610 | /* | |
611 | * We will only need *early* access to the following | |
11520e5e | 612 | * two EFI runtime services before set_virtual_address_map |
140bf275 OJ |
613 | * is invoked. |
614 | */ | |
11520e5e | 615 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; |
140bf275 OJ |
616 | efi_phys.set_virtual_address_map = |
617 | (efi_set_virtual_address_map_t *) | |
618 | runtime->set_virtual_address_map; | |
11520e5e LT |
619 | /* |
620 | * Make efi_get_time can be called before entering | |
621 | * virtual mode. | |
622 | */ | |
623 | efi.get_time = phys_efi_get_time; | |
beacfaac | 624 | early_iounmap(runtime, sizeof(efi_runtime_services_t)); |
140bf275 OJ |
625 | |
626 | return 0; | |
83e7ee66 | 627 | } |
5b83683f | 628 | |
140bf275 | 629 | static int __init efi_memmap_init(void) |
83e7ee66 | 630 | { |
5b83683f | 631 | /* Map the EFI memory map */ |
beacfaac HY |
632 | memmap.map = early_ioremap((unsigned long)memmap.phys_map, |
633 | memmap.nr_map * memmap.desc_size); | |
140bf275 | 634 | if (memmap.map == NULL) { |
e3cb3f5a | 635 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
636 | return -ENOMEM; |
637 | } | |
5b83683f | 638 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 639 | |
200001eb PJ |
640 | if (add_efi_memmap) |
641 | do_add_efi_memmap(); | |
140bf275 OJ |
642 | |
643 | return 0; | |
83e7ee66 OJ |
644 | } |
645 | ||
1fec0533 DY |
646 | /* |
647 | * A number of config table entries get remapped to virtual addresses | |
648 | * after entering EFI virtual mode. However, the kexec kernel requires | |
649 | * their physical addresses therefore we pass them via setup_data and | |
650 | * correct those entries to their respective physical addresses here. | |
651 | * | |
652 | * Currently only handles smbios which is necessary for some firmware | |
653 | * implementation. | |
654 | */ | |
655 | static int __init efi_reuse_config(u64 tables, int nr_tables) | |
656 | { | |
657 | int i, sz, ret = 0; | |
658 | void *p, *tablep; | |
659 | struct efi_setup_data *data; | |
660 | ||
661 | if (!efi_setup) | |
662 | return 0; | |
663 | ||
664 | if (!efi_enabled(EFI_64BIT)) | |
665 | return 0; | |
666 | ||
667 | data = early_memremap(efi_setup, sizeof(*data)); | |
668 | if (!data) { | |
669 | ret = -ENOMEM; | |
670 | goto out; | |
671 | } | |
672 | ||
673 | if (!data->smbios) | |
674 | goto out_memremap; | |
675 | ||
676 | sz = sizeof(efi_config_table_64_t); | |
677 | ||
678 | p = tablep = early_memremap(tables, nr_tables * sz); | |
679 | if (!p) { | |
680 | pr_err("Could not map Configuration table!\n"); | |
681 | ret = -ENOMEM; | |
682 | goto out_memremap; | |
683 | } | |
684 | ||
685 | for (i = 0; i < efi.systab->nr_tables; i++) { | |
686 | efi_guid_t guid; | |
687 | ||
688 | guid = ((efi_config_table_64_t *)p)->guid; | |
689 | ||
690 | if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) | |
691 | ((efi_config_table_64_t *)p)->table = data->smbios; | |
692 | p += sz; | |
693 | } | |
694 | early_iounmap(tablep, nr_tables * sz); | |
695 | ||
696 | out_memremap: | |
697 | early_iounmap(data, sizeof(*data)); | |
698 | out: | |
699 | return ret; | |
700 | } | |
701 | ||
83e7ee66 OJ |
702 | void __init efi_init(void) |
703 | { | |
704 | efi_char16_t *c16; | |
705 | char vendor[100] = "unknown"; | |
706 | int i = 0; | |
707 | void *tmp; | |
708 | ||
709 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
710 | if (boot_params.efi_info.efi_systab_hi || |
711 | boot_params.efi_info.efi_memmap_hi) { | |
712 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
713 | return; |
714 | } | |
83e7ee66 OJ |
715 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
716 | #else | |
717 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
718 | (boot_params.efi_info.efi_systab | |
719 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
720 | #endif |
721 | ||
83e68189 | 722 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 723 | return; |
83e68189 MF |
724 | |
725 | set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility); | |
83e7ee66 | 726 | |
a0998eb1 DY |
727 | efi.config_table = (unsigned long)efi.systab->tables; |
728 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
729 | efi.runtime = (unsigned long)efi.systab->runtime; | |
730 | ||
83e7ee66 OJ |
731 | /* |
732 | * Show what we know for posterity | |
733 | */ | |
734 | c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); | |
735 | if (c16) { | |
736 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
737 | vendor[i] = *c16++; | |
738 | vendor[i] = '\0'; | |
739 | } else | |
e3cb3f5a | 740 | pr_err("Could not map the firmware vendor!\n"); |
83e7ee66 OJ |
741 | early_iounmap(tmp, 2); |
742 | ||
e3cb3f5a OJ |
743 | pr_info("EFI v%u.%.02u by %s\n", |
744 | efi.systab->hdr.revision >> 16, | |
745 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 746 | |
1fec0533 DY |
747 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
748 | return; | |
749 | ||
272686bf | 750 | if (efi_config_init(arch_tables)) |
140bf275 | 751 | return; |
83e68189 MF |
752 | |
753 | set_bit(EFI_CONFIG_TABLES, &x86_efi_facility); | |
83e7ee66 | 754 | |
1adbfa35 OJ |
755 | /* |
756 | * Note: We currently don't support runtime services on an EFI | |
757 | * that doesn't match the kernel 32/64-bit mode. | |
758 | */ | |
759 | ||
5189c2a7 | 760 | if (!efi_is_native()) |
1adbfa35 | 761 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 762 | else { |
fb834c7a | 763 | if (disable_runtime || efi_runtime_init()) |
83e68189 MF |
764 | return; |
765 | set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility); | |
140bf275 | 766 | } |
83e68189 | 767 | if (efi_memmap_init()) |
140bf275 | 768 | return; |
83e68189 MF |
769 | |
770 | set_bit(EFI_MEMMAP, &x86_efi_facility); | |
771 | ||
5b83683f | 772 | print_efi_memmap(); |
5b83683f HY |
773 | } |
774 | ||
2223af38 JT |
775 | void __init efi_late_init(void) |
776 | { | |
777 | efi_bgrt_init(); | |
778 | } | |
779 | ||
9cd2b07c MG |
780 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
781 | { | |
782 | u64 addr, npages; | |
783 | ||
784 | addr = md->virt_addr; | |
785 | npages = md->num_pages; | |
786 | ||
787 | memrange_efi_to_native(&addr, &npages); | |
788 | ||
789 | if (executable) | |
790 | set_memory_x(addr, npages); | |
791 | else | |
792 | set_memory_nx(addr, npages); | |
793 | } | |
794 | ||
a2172e25 HY |
795 | static void __init runtime_code_page_mkexec(void) |
796 | { | |
797 | efi_memory_desc_t *md; | |
a2172e25 HY |
798 | void *p; |
799 | ||
a2172e25 HY |
800 | /* Make EFI runtime service code area executable */ |
801 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
802 | md = p; | |
1c083eb2 HY |
803 | |
804 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
805 | continue; | |
806 | ||
9cd2b07c | 807 | efi_set_executable(md, true); |
a2172e25 | 808 | } |
a2172e25 | 809 | } |
a2172e25 | 810 | |
3e8fa263 MF |
811 | void efi_memory_uc(u64 addr, unsigned long size) |
812 | { | |
813 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
814 | u64 npages; | |
815 | ||
816 | npages = round_up(size, page_shift) / page_shift; | |
817 | memrange_efi_to_native(&addr, &npages); | |
818 | set_memory_uc(addr, npages); | |
819 | } | |
820 | ||
d2f7cbe7 BP |
821 | void __init old_map_region(efi_memory_desc_t *md) |
822 | { | |
823 | u64 start_pfn, end_pfn, end; | |
824 | unsigned long size; | |
825 | void *va; | |
826 | ||
827 | start_pfn = PFN_DOWN(md->phys_addr); | |
828 | size = md->num_pages << PAGE_SHIFT; | |
829 | end = md->phys_addr + size; | |
830 | end_pfn = PFN_UP(end); | |
831 | ||
832 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
833 | va = __va(md->phys_addr); | |
834 | ||
835 | if (!(md->attribute & EFI_MEMORY_WB)) | |
836 | efi_memory_uc((u64)(unsigned long)va, size); | |
837 | } else | |
838 | va = efi_ioremap(md->phys_addr, size, | |
839 | md->type, md->attribute); | |
840 | ||
841 | md->virt_addr = (u64) (unsigned long) va; | |
842 | if (!va) | |
843 | pr_err("ioremap of 0x%llX failed!\n", | |
844 | (unsigned long long)md->phys_addr); | |
845 | } | |
846 | ||
481f75c0 DY |
847 | /* Merge contiguous regions of the same type and attribute */ |
848 | static void __init efi_merge_regions(void) | |
5b83683f | 849 | { |
481f75c0 | 850 | void *p; |
202f9d0a | 851 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 852 | |
202f9d0a MG |
853 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
854 | u64 prev_size; | |
855 | md = p; | |
856 | ||
857 | if (!prev_md) { | |
858 | prev_md = md; | |
859 | continue; | |
860 | } | |
861 | ||
862 | if (prev_md->type != md->type || | |
863 | prev_md->attribute != md->attribute) { | |
864 | prev_md = md; | |
865 | continue; | |
866 | } | |
867 | ||
868 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
869 | ||
870 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
871 | prev_md->num_pages += md->num_pages; | |
872 | md->type = EFI_RESERVED_TYPE; | |
873 | md->attribute = 0; | |
874 | continue; | |
875 | } | |
876 | prev_md = md; | |
481f75c0 DY |
877 | } |
878 | } | |
879 | ||
880 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
881 | { | |
882 | unsigned long size; | |
883 | u64 end, systab; | |
d2f7cbe7 | 884 | |
481f75c0 DY |
885 | size = md->num_pages << EFI_PAGE_SHIFT; |
886 | end = md->phys_addr + size; | |
887 | systab = (u64)(unsigned long)efi_phys.systab; | |
888 | if (md->phys_addr <= systab && systab < end) { | |
889 | systab += md->virt_addr - md->phys_addr; | |
890 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 891 | } |
481f75c0 DY |
892 | } |
893 | ||
926172d4 DY |
894 | static int __init save_runtime_map(void) |
895 | { | |
896 | efi_memory_desc_t *md; | |
897 | void *tmp, *p, *q = NULL; | |
898 | int count = 0; | |
899 | ||
900 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
901 | md = p; | |
902 | ||
903 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || | |
904 | (md->type == EFI_BOOT_SERVICES_CODE) || | |
905 | (md->type == EFI_BOOT_SERVICES_DATA)) | |
906 | continue; | |
907 | tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL); | |
908 | if (!tmp) | |
909 | goto out; | |
910 | q = tmp; | |
911 | ||
912 | memcpy(q + count * memmap.desc_size, md, memmap.desc_size); | |
913 | count++; | |
914 | } | |
915 | ||
518548ab | 916 | efi_runtime_map_setup(q, count, memmap.desc_size); |
926172d4 DY |
917 | |
918 | return 0; | |
919 | out: | |
920 | kfree(q); | |
921 | return -ENOMEM; | |
922 | } | |
923 | ||
1fec0533 DY |
924 | /* |
925 | * Map efi regions which were passed via setup_data. The virt_addr is a fixed | |
926 | * addr which was used in first kernel of a kexec boot. | |
927 | */ | |
928 | static void __init efi_map_regions_fixed(void) | |
929 | { | |
930 | void *p; | |
931 | efi_memory_desc_t *md; | |
932 | ||
933 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
934 | md = p; | |
935 | efi_map_region_fixed(md); /* FIXME: add error handling */ | |
936 | get_systab_virt_addr(md); | |
937 | } | |
938 | ||
939 | } | |
940 | ||
481f75c0 DY |
941 | /* |
942 | * Map efi memory ranges for runtime serivce and update new_memmap with virtual | |
943 | * addresses. | |
944 | */ | |
945 | static void * __init efi_map_regions(int *count) | |
946 | { | |
947 | efi_memory_desc_t *md; | |
948 | void *p, *tmp, *new_memmap = NULL; | |
202f9d0a | 949 | |
5b83683f HY |
950 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
951 | md = p; | |
70087011 JB |
952 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
953 | #ifdef CONFIG_X86_64 | |
954 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
955 | md->type != EFI_BOOT_SERVICES_DATA) | |
956 | #endif | |
957 | continue; | |
958 | } | |
1c083eb2 | 959 | |
d2f7cbe7 | 960 | efi_map_region(md); |
481f75c0 DY |
961 | get_systab_virt_addr(md); |
962 | ||
963 | tmp = krealloc(new_memmap, (*count + 1) * memmap.desc_size, | |
964 | GFP_KERNEL); | |
965 | if (!tmp) | |
926172d4 | 966 | goto out; |
481f75c0 DY |
967 | new_memmap = tmp; |
968 | memcpy(new_memmap + (*count * memmap.desc_size), md, | |
969 | memmap.desc_size); | |
970 | (*count)++; | |
971 | } | |
d2f7cbe7 | 972 | |
481f75c0 | 973 | return new_memmap; |
926172d4 | 974 | out: |
481f75c0 DY |
975 | kfree(new_memmap); |
976 | return NULL; | |
977 | } | |
978 | ||
979 | /* | |
980 | * This function will switch the EFI runtime services to virtual mode. | |
981 | * Essentially, we look through the EFI memmap and map every region that | |
982 | * has the runtime attribute bit set in its memory descriptor into the | |
983 | * ->trampoline_pgd page table using a top-down VA allocation scheme. | |
984 | * | |
985 | * The old method which used to update that memory descriptor with the | |
986 | * virtual address obtained from ioremap() is still supported when the | |
987 | * kernel is booted with efi=old_map on its command line. Same old | |
988 | * method enabled the runtime services to be called without having to | |
989 | * thunk back into physical mode for every invocation. | |
990 | * | |
991 | * The new method does a pagetable switch in a preemption-safe manner | |
992 | * so that we're in a different address space when calling a runtime | |
993 | * function. For function arguments passing we do copy the PGDs of the | |
994 | * kernel page table into ->trampoline_pgd prior to each call. | |
1fec0533 DY |
995 | * |
996 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
997 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
998 | * to the same virtual addresses as the first kernel. | |
481f75c0 DY |
999 | */ |
1000 | void __init efi_enter_virtual_mode(void) | |
1001 | { | |
1002 | efi_status_t status; | |
1003 | void *new_memmap = NULL; | |
926172d4 | 1004 | int err, count = 0; |
1c083eb2 | 1005 | |
481f75c0 | 1006 | efi.systab = NULL; |
d2f7cbe7 | 1007 | |
481f75c0 DY |
1008 | /* |
1009 | * We don't do virtual mode, since we don't do runtime services, on | |
1010 | * non-native EFI | |
1011 | */ | |
1012 | if (!efi_is_native()) { | |
1013 | efi_unmap_memmap(); | |
1014 | return; | |
1015 | } | |
d2f7cbe7 | 1016 | |
1fec0533 DY |
1017 | if (efi_setup) { |
1018 | efi_map_regions_fixed(); | |
1019 | } else { | |
1020 | efi_merge_regions(); | |
1021 | new_memmap = efi_map_regions(&count); | |
1022 | if (!new_memmap) { | |
1023 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
1024 | return; | |
1025 | } | |
5b83683f HY |
1026 | } |
1027 | ||
926172d4 DY |
1028 | err = save_runtime_map(); |
1029 | if (err) | |
1030 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); | |
1031 | ||
5b83683f HY |
1032 | BUG_ON(!efi.systab); |
1033 | ||
d2f7cbe7 BP |
1034 | efi_setup_page_tables(); |
1035 | efi_sync_low_kernel_mappings(); | |
1036 | ||
1fec0533 DY |
1037 | if (!efi_setup) { |
1038 | status = phys_efi_set_virtual_address_map( | |
1039 | memmap.desc_size * count, | |
1040 | memmap.desc_size, | |
1041 | memmap.desc_version, | |
1042 | (efi_memory_desc_t *)__pa(new_memmap)); | |
1043 | ||
1044 | if (status != EFI_SUCCESS) { | |
1045 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
1046 | status); | |
1047 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
1048 | } | |
5b83683f HY |
1049 | } |
1050 | ||
1051 | /* | |
1052 | * Now that EFI is in virtual mode, update the function | |
1053 | * pointers in the runtime service table to the new virtual addresses. | |
1054 | * | |
1055 | * Call EFI services through wrapper functions. | |
1056 | */ | |
712ba9e9 | 1057 | efi.runtime_version = efi_systab.hdr.revision; |
5b83683f HY |
1058 | efi.get_time = virt_efi_get_time; |
1059 | efi.set_time = virt_efi_set_time; | |
1060 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
1061 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
1062 | efi.get_variable = virt_efi_get_variable; | |
1063 | efi.get_next_variable = virt_efi_get_next_variable; | |
1064 | efi.set_variable = virt_efi_set_variable; | |
1065 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
1066 | efi.reset_system = virt_efi_reset_system; | |
2b5e8ef3 | 1067 | efi.set_virtual_address_map = NULL; |
3b370237 MG |
1068 | efi.query_variable_info = virt_efi_query_variable_info; |
1069 | efi.update_capsule = virt_efi_update_capsule; | |
1070 | efi.query_capsule_caps = virt_efi_query_capsule_caps; | |
d2f7cbe7 BP |
1071 | |
1072 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
4de0d4a6 | 1073 | runtime_code_page_mkexec(); |
1adbfa35 | 1074 | |
7cb00b72 | 1075 | kfree(new_memmap); |
f8b84043 MG |
1076 | |
1077 | /* clean DUMMY object */ | |
1078 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
1079 | EFI_VARIABLE_NON_VOLATILE | | |
1080 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
1081 | EFI_VARIABLE_RUNTIME_ACCESS, | |
1082 | 0, NULL); | |
5b83683f HY |
1083 | } |
1084 | ||
1085 | /* | |
1086 | * Convenience functions to obtain memory types and attributes | |
1087 | */ | |
1088 | u32 efi_mem_type(unsigned long phys_addr) | |
1089 | { | |
1090 | efi_memory_desc_t *md; | |
1091 | void *p; | |
1092 | ||
83e68189 MF |
1093 | if (!efi_enabled(EFI_MEMMAP)) |
1094 | return 0; | |
1095 | ||
5b83683f HY |
1096 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
1097 | md = p; | |
1098 | if ((md->phys_addr <= phys_addr) && | |
1099 | (phys_addr < (md->phys_addr + | |
1100 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
1101 | return md->type; | |
1102 | } | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | u64 efi_mem_attributes(unsigned long phys_addr) | |
1107 | { | |
1108 | efi_memory_desc_t *md; | |
1109 | void *p; | |
1110 | ||
1111 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
1112 | md = p; | |
1113 | if ((md->phys_addr <= phys_addr) && | |
1114 | (phys_addr < (md->phys_addr + | |
1115 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
1116 | return md->attribute; | |
1117 | } | |
1118 | return 0; | |
1119 | } | |
a6e4d5a0 MF |
1120 | |
1121 | /* | |
1122 | * Some firmware has serious problems when using more than 50% of the EFI | |
1123 | * variable store, i.e. it triggers bugs that can brick machines. Ensure that | |
1124 | * we never use more than this safe limit. | |
1125 | * | |
1126 | * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable | |
1127 | * store. | |
1128 | */ | |
1129 | efi_status_t efi_query_variable_store(u32 attributes, unsigned long size) | |
1130 | { | |
1131 | efi_status_t status; | |
1132 | u64 storage_size, remaining_size, max_size; | |
1133 | ||
f8b84043 MG |
1134 | if (!(attributes & EFI_VARIABLE_NON_VOLATILE)) |
1135 | return 0; | |
1136 | ||
a6e4d5a0 MF |
1137 | status = efi.query_variable_info(attributes, &storage_size, |
1138 | &remaining_size, &max_size); | |
1139 | if (status != EFI_SUCCESS) | |
1140 | return status; | |
1141 | ||
31ff2f20 MG |
1142 | /* |
1143 | * Some firmware implementations refuse to boot if there's insufficient | |
1144 | * space in the variable store. We account for that by refusing the | |
1145 | * write if permitting it would reduce the available space to under | |
f8b84043 | 1146 | * 5KB. This figure was provided by Samsung, so should be safe. |
31ff2f20 | 1147 | */ |
f8b84043 MG |
1148 | if ((remaining_size - size < EFI_MIN_RESERVE) && |
1149 | !efi_no_storage_paranoia) { | |
1150 | ||
1151 | /* | |
1152 | * Triggering garbage collection may require that the firmware | |
1153 | * generate a real EFI_OUT_OF_RESOURCES error. We can force | |
1154 | * that by attempting to use more space than is available. | |
1155 | */ | |
1156 | unsigned long dummy_size = remaining_size + 1024; | |
b8cb62f8 BH |
1157 | void *dummy = kzalloc(dummy_size, GFP_ATOMIC); |
1158 | ||
1159 | if (!dummy) | |
1160 | return EFI_OUT_OF_RESOURCES; | |
f8b84043 MG |
1161 | |
1162 | status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
1163 | EFI_VARIABLE_NON_VOLATILE | | |
1164 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
1165 | EFI_VARIABLE_RUNTIME_ACCESS, | |
1166 | dummy_size, dummy); | |
1167 | ||
1168 | if (status == EFI_SUCCESS) { | |
1169 | /* | |
1170 | * This should have failed, so if it didn't make sure | |
1171 | * that we delete it... | |
1172 | */ | |
1173 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
1174 | EFI_VARIABLE_NON_VOLATILE | | |
1175 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
1176 | EFI_VARIABLE_RUNTIME_ACCESS, | |
1177 | 0, dummy); | |
1178 | } | |
7791c842 | 1179 | |
b8cb62f8 BH |
1180 | kfree(dummy); |
1181 | ||
f8b84043 MG |
1182 | /* |
1183 | * The runtime code may now have triggered a garbage collection | |
1184 | * run, so check the variable info again | |
1185 | */ | |
1186 | status = efi.query_variable_info(attributes, &storage_size, | |
1187 | &remaining_size, &max_size); | |
8c58bf3e | 1188 | |
f8b84043 MG |
1189 | if (status != EFI_SUCCESS) |
1190 | return status; | |
1191 | ||
1192 | /* | |
1193 | * There still isn't enough room, so return an error | |
1194 | */ | |
1195 | if (remaining_size - size < EFI_MIN_RESERVE) | |
1196 | return EFI_OUT_OF_RESOURCES; | |
1197 | } | |
a6e4d5a0 MF |
1198 | |
1199 | return EFI_SUCCESS; | |
1200 | } | |
3668011d | 1201 | EXPORT_SYMBOL_GPL(efi_query_variable_store); |
d2f7cbe7 BP |
1202 | |
1203 | static int __init parse_efi_cmdline(char *str) | |
1204 | { | |
1205 | if (*str == '=') | |
1206 | str++; | |
1207 | ||
1208 | if (!strncmp(str, "old_map", 7)) | |
1209 | set_bit(EFI_OLD_MEMMAP, &x86_efi_facility); | |
1210 | ||
1211 | return 0; | |
1212 | } | |
1213 | early_param("efi", parse_efi_cmdline); |