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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> | |
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> | |
45 | ||
46 | #include <asm/setup.h> | |
47 | #include <asm/efi.h> | |
48 | #include <asm/time.h> | |
a2172e25 HY |
49 | #include <asm/cacheflush.h> |
50 | #include <asm/tlbflush.h> | |
7bd867df | 51 | #include <asm/x86_init.h> |
3195ef59 | 52 | #include <asm/rtc.h> |
5b83683f HY |
53 | |
54 | #define EFI_DEBUG 1 | |
5b83683f | 55 | |
f8b84043 MG |
56 | #define EFI_MIN_RESERVE 5120 |
57 | ||
58 | #define EFI_DUMMY_GUID \ | |
59 | EFI_GUID(0x4424ac57, 0xbe4b, 0x47dd, 0x9e, 0x97, 0xed, 0x50, 0xf0, 0x9f, 0x92, 0xa9) | |
60 | ||
61 | static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 }; | |
31ff2f20 | 62 | |
5b83683f HY |
63 | struct efi_memory_map memmap; |
64 | ||
ecaea42e | 65 | static struct efi efi_phys __initdata; |
5b83683f HY |
66 | static efi_system_table_t efi_systab __initdata; |
67 | ||
83e68189 MF |
68 | unsigned long x86_efi_facility; |
69 | ||
272686bf LL |
70 | static __initdata efi_config_table_type_t arch_tables[] = { |
71 | #ifdef CONFIG_X86_UV | |
72 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, | |
73 | #endif | |
74 | {NULL_GUID, NULL, 0}, | |
75 | }; | |
76 | ||
83e68189 MF |
77 | /* |
78 | * Returns 1 if 'facility' is enabled, 0 otherwise. | |
79 | */ | |
80 | int efi_enabled(int facility) | |
81 | { | |
82 | return test_bit(facility, &x86_efi_facility) != 0; | |
5189c2a7 | 83 | } |
83e68189 | 84 | EXPORT_SYMBOL(efi_enabled); |
5189c2a7 | 85 | |
058e7b58 | 86 | static bool __initdata disable_runtime = false; |
8b2cb7a8 HY |
87 | static int __init setup_noefi(char *arg) |
88 | { | |
fb834c7a | 89 | disable_runtime = true; |
8b2cb7a8 HY |
90 | return 0; |
91 | } | |
92 | early_param("noefi", setup_noefi); | |
93 | ||
200001eb PJ |
94 | int add_efi_memmap; |
95 | EXPORT_SYMBOL(add_efi_memmap); | |
96 | ||
97 | static int __init setup_add_efi_memmap(char *arg) | |
98 | { | |
99 | add_efi_memmap = 1; | |
100 | return 0; | |
101 | } | |
102 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
103 | ||
8c58bf3e RW |
104 | static bool efi_no_storage_paranoia; |
105 | ||
106 | static int __init setup_storage_paranoia(char *arg) | |
107 | { | |
108 | efi_no_storage_paranoia = true; | |
109 | return 0; | |
110 | } | |
111 | early_param("efi_no_storage_paranoia", setup_storage_paranoia); | |
112 | ||
200001eb | 113 | |
5b83683f HY |
114 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
115 | { | |
ef68c8f8 JB |
116 | unsigned long flags; |
117 | efi_status_t status; | |
118 | ||
119 | spin_lock_irqsave(&rtc_lock, flags); | |
120 | status = efi_call_virt2(get_time, tm, tc); | |
121 | spin_unlock_irqrestore(&rtc_lock, flags); | |
122 | return status; | |
5b83683f HY |
123 | } |
124 | ||
125 | static efi_status_t virt_efi_set_time(efi_time_t *tm) | |
126 | { | |
ef68c8f8 JB |
127 | unsigned long flags; |
128 | efi_status_t status; | |
129 | ||
130 | spin_lock_irqsave(&rtc_lock, flags); | |
131 | status = efi_call_virt1(set_time, tm); | |
132 | spin_unlock_irqrestore(&rtc_lock, flags); | |
133 | return status; | |
5b83683f HY |
134 | } |
135 | ||
136 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, | |
137 | efi_bool_t *pending, | |
138 | efi_time_t *tm) | |
139 | { | |
ef68c8f8 JB |
140 | unsigned long flags; |
141 | efi_status_t status; | |
142 | ||
143 | spin_lock_irqsave(&rtc_lock, flags); | |
144 | status = efi_call_virt3(get_wakeup_time, | |
145 | enabled, pending, tm); | |
146 | spin_unlock_irqrestore(&rtc_lock, flags); | |
147 | return status; | |
5b83683f HY |
148 | } |
149 | ||
150 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
151 | { | |
ef68c8f8 JB |
152 | unsigned long flags; |
153 | efi_status_t status; | |
154 | ||
155 | spin_lock_irqsave(&rtc_lock, flags); | |
156 | status = efi_call_virt2(set_wakeup_time, | |
157 | enabled, tm); | |
158 | spin_unlock_irqrestore(&rtc_lock, flags); | |
159 | return status; | |
5b83683f HY |
160 | } |
161 | ||
162 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, | |
163 | efi_guid_t *vendor, | |
164 | u32 *attr, | |
165 | unsigned long *data_size, | |
166 | void *data) | |
167 | { | |
168 | return efi_call_virt5(get_variable, | |
169 | name, vendor, attr, | |
170 | data_size, data); | |
171 | } | |
172 | ||
173 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, | |
174 | efi_char16_t *name, | |
175 | efi_guid_t *vendor) | |
176 | { | |
f8b84043 MG |
177 | return efi_call_virt3(get_next_variable, |
178 | name_size, name, vendor); | |
5b83683f HY |
179 | } |
180 | ||
181 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, | |
182 | efi_guid_t *vendor, | |
f7a2d73f | 183 | u32 attr, |
5b83683f HY |
184 | unsigned long data_size, |
185 | void *data) | |
186 | { | |
f8b84043 MG |
187 | return efi_call_virt5(set_variable, |
188 | name, vendor, attr, | |
189 | data_size, data); | |
5b83683f HY |
190 | } |
191 | ||
3b370237 MG |
192 | static efi_status_t virt_efi_query_variable_info(u32 attr, |
193 | u64 *storage_space, | |
194 | u64 *remaining_space, | |
195 | u64 *max_variable_size) | |
196 | { | |
197 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
198 | return EFI_UNSUPPORTED; | |
199 | ||
200 | return efi_call_virt4(query_variable_info, attr, storage_space, | |
201 | remaining_space, max_variable_size); | |
202 | } | |
203 | ||
5b83683f HY |
204 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) |
205 | { | |
206 | return efi_call_virt1(get_next_high_mono_count, count); | |
207 | } | |
208 | ||
209 | static void virt_efi_reset_system(int reset_type, | |
210 | efi_status_t status, | |
211 | unsigned long data_size, | |
212 | efi_char16_t *data) | |
213 | { | |
214 | efi_call_virt4(reset_system, reset_type, status, | |
215 | data_size, data); | |
216 | } | |
217 | ||
3b370237 MG |
218 | static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, |
219 | unsigned long count, | |
220 | unsigned long sg_list) | |
221 | { | |
222 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
223 | return EFI_UNSUPPORTED; | |
224 | ||
225 | return efi_call_virt3(update_capsule, capsules, count, sg_list); | |
226 | } | |
227 | ||
228 | static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, | |
229 | unsigned long count, | |
230 | u64 *max_size, | |
231 | int *reset_type) | |
232 | { | |
233 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
234 | return EFI_UNSUPPORTED; | |
235 | ||
236 | return efi_call_virt4(query_capsule_caps, capsules, count, max_size, | |
237 | reset_type); | |
238 | } | |
239 | ||
5b83683f HY |
240 | static efi_status_t __init phys_efi_set_virtual_address_map( |
241 | unsigned long memory_map_size, | |
242 | unsigned long descriptor_size, | |
243 | u32 descriptor_version, | |
244 | efi_memory_desc_t *virtual_map) | |
245 | { | |
246 | efi_status_t status; | |
247 | ||
248 | efi_call_phys_prelog(); | |
249 | status = efi_call_phys4(efi_phys.set_virtual_address_map, | |
250 | memory_map_size, descriptor_size, | |
251 | descriptor_version, virtual_map); | |
252 | efi_call_phys_epilog(); | |
253 | return status; | |
254 | } | |
255 | ||
11520e5e LT |
256 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, |
257 | efi_time_cap_t *tc) | |
258 | { | |
259 | unsigned long flags; | |
260 | efi_status_t status; | |
261 | ||
262 | spin_lock_irqsave(&rtc_lock, flags); | |
263 | efi_call_phys_prelog(); | |
264 | status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), | |
265 | virt_to_phys(tc)); | |
266 | efi_call_phys_epilog(); | |
267 | spin_unlock_irqrestore(&rtc_lock, flags); | |
268 | return status; | |
269 | } | |
270 | ||
3565184e | 271 | int efi_set_rtc_mmss(const struct timespec *now) |
5b83683f | 272 | { |
3565184e | 273 | unsigned long nowtime = now->tv_sec; |
5b83683f HY |
274 | efi_status_t status; |
275 | efi_time_t eft; | |
276 | efi_time_cap_t cap; | |
3195ef59 | 277 | struct rtc_time tm; |
5b83683f HY |
278 | |
279 | status = efi.get_time(&eft, &cap); | |
280 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 281 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
282 | return -1; |
283 | } | |
284 | ||
3195ef59 PB |
285 | rtc_time_to_tm(nowtime, &tm); |
286 | if (!rtc_valid_tm(&tm)) { | |
287 | eft.year = tm.tm_year + 1900; | |
288 | eft.month = tm.tm_mon + 1; | |
289 | eft.day = tm.tm_mday; | |
290 | eft.minute = tm.tm_min; | |
291 | eft.second = tm.tm_sec; | |
292 | eft.nanosecond = 0; | |
293 | } else { | |
294 | printk(KERN_ERR | |
295 | "%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n", | |
296 | __FUNCTION__, nowtime); | |
297 | return -1; | |
298 | } | |
5b83683f HY |
299 | |
300 | status = efi.set_time(&eft); | |
301 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 302 | pr_err("Oops: efitime: can't write time!\n"); |
5b83683f HY |
303 | return -1; |
304 | } | |
305 | return 0; | |
306 | } | |
307 | ||
3565184e | 308 | void efi_get_time(struct timespec *now) |
5b83683f HY |
309 | { |
310 | efi_status_t status; | |
311 | efi_time_t eft; | |
312 | efi_time_cap_t cap; | |
313 | ||
314 | status = efi.get_time(&eft, &cap); | |
315 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 316 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f | 317 | |
3565184e DV |
318 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
319 | eft.minute, eft.second); | |
320 | now->tv_nsec = 0; | |
5b83683f HY |
321 | } |
322 | ||
69c91893 PJ |
323 | /* |
324 | * Tell the kernel about the EFI memory map. This might include | |
325 | * more than the max 128 entries that can fit in the e820 legacy | |
326 | * (zeropage) memory map. | |
327 | */ | |
328 | ||
200001eb | 329 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
330 | { |
331 | void *p; | |
332 | ||
333 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
334 | efi_memory_desc_t *md = p; | |
335 | unsigned long long start = md->phys_addr; | |
336 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
337 | int e820_type; | |
338 | ||
e2a71476 CW |
339 | switch (md->type) { |
340 | case EFI_LOADER_CODE: | |
341 | case EFI_LOADER_DATA: | |
342 | case EFI_BOOT_SERVICES_CODE: | |
343 | case EFI_BOOT_SERVICES_DATA: | |
344 | case EFI_CONVENTIONAL_MEMORY: | |
345 | if (md->attribute & EFI_MEMORY_WB) | |
346 | e820_type = E820_RAM; | |
347 | else | |
348 | e820_type = E820_RESERVED; | |
349 | break; | |
350 | case EFI_ACPI_RECLAIM_MEMORY: | |
351 | e820_type = E820_ACPI; | |
352 | break; | |
353 | case EFI_ACPI_MEMORY_NVS: | |
354 | e820_type = E820_NVS; | |
355 | break; | |
356 | case EFI_UNUSABLE_MEMORY: | |
357 | e820_type = E820_UNUSABLE; | |
358 | break; | |
359 | default: | |
360 | /* | |
361 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
362 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
363 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
364 | */ | |
69c91893 | 365 | e820_type = E820_RESERVED; |
e2a71476 CW |
366 | break; |
367 | } | |
d0be6bde | 368 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
369 | } |
370 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
371 | } | |
372 | ||
1adbfa35 | 373 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 374 | { |
15b9c359 | 375 | struct efi_info *e = &boot_params.efi_info; |
ecacf09f HY |
376 | unsigned long pmap; |
377 | ||
05486fa7 | 378 | #ifdef CONFIG_X86_32 |
1adbfa35 | 379 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 380 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
381 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
382 | return -EINVAL; | |
383 | } | |
15b9c359 | 384 | pmap = e->efi_memmap; |
05486fa7 | 385 | #else |
15b9c359 | 386 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 387 | #endif |
15b9c359 BP |
388 | memmap.phys_map = (void *)pmap; |
389 | memmap.nr_map = e->efi_memmap_size / | |
390 | e->efi_memdesc_size; | |
391 | memmap.desc_size = e->efi_memdesc_size; | |
392 | memmap.desc_version = e->efi_memdesc_version; | |
393 | ||
24aa0788 | 394 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 | 395 | |
258f6fd7 LL |
396 | efi.memmap = &memmap; |
397 | ||
1adbfa35 | 398 | return 0; |
ecacf09f HY |
399 | } |
400 | ||
5b83683f HY |
401 | #if EFI_DEBUG |
402 | static void __init print_efi_memmap(void) | |
403 | { | |
404 | efi_memory_desc_t *md; | |
405 | void *p; | |
406 | int i; | |
407 | ||
408 | for (p = memmap.map, i = 0; | |
409 | p < memmap.map_end; | |
410 | p += memmap.desc_size, i++) { | |
411 | md = p; | |
e3cb3f5a | 412 | pr_info("mem%02u: type=%u, attr=0x%llx, " |
5b83683f HY |
413 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", |
414 | i, md->type, md->attribute, md->phys_addr, | |
415 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
416 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
417 | } | |
418 | } | |
419 | #endif /* EFI_DEBUG */ | |
420 | ||
916f676f MG |
421 | void __init efi_reserve_boot_services(void) |
422 | { | |
423 | void *p; | |
424 | ||
425 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
426 | efi_memory_desc_t *md = p; | |
7d68dc3f ML |
427 | u64 start = md->phys_addr; |
428 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
916f676f MG |
429 | |
430 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
431 | md->type != EFI_BOOT_SERVICES_DATA) | |
432 | continue; | |
7d68dc3f ML |
433 | /* Only reserve where possible: |
434 | * - Not within any already allocated areas | |
435 | * - Not over any memory area (really needed, if above?) | |
436 | * - Not within any part of the kernel | |
437 | * - Not the bios reserved area | |
438 | */ | |
fc8d7826 AD |
439 | if ((start+size >= __pa_symbol(_text) |
440 | && start <= __pa_symbol(_end)) || | |
7d68dc3f | 441 | !e820_all_mapped(start, start+size, E820_RAM) || |
bf61549a | 442 | memblock_is_region_reserved(start, size)) { |
7d68dc3f ML |
443 | /* Could not reserve, skip it */ |
444 | md->num_pages = 0; | |
e3cb3f5a | 445 | memblock_dbg("Could not reserve boot range " |
7d68dc3f ML |
446 | "[0x%010llx-0x%010llx]\n", |
447 | start, start+size-1); | |
448 | } else | |
24aa0788 | 449 | memblock_reserve(start, size); |
916f676f MG |
450 | } |
451 | } | |
452 | ||
5189c2a7 | 453 | void __init efi_unmap_memmap(void) |
78510792 | 454 | { |
83e68189 | 455 | clear_bit(EFI_MEMMAP, &x86_efi_facility); |
78510792 JT |
456 | if (memmap.map) { |
457 | early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); | |
458 | memmap.map = NULL; | |
459 | } | |
460 | } | |
461 | ||
462 | void __init efi_free_boot_services(void) | |
916f676f MG |
463 | { |
464 | void *p; | |
465 | ||
5189c2a7 | 466 | if (!efi_is_native()) |
78510792 JT |
467 | return; |
468 | ||
916f676f MG |
469 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
470 | efi_memory_desc_t *md = p; | |
471 | unsigned long long start = md->phys_addr; | |
472 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
473 | ||
474 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
475 | md->type != EFI_BOOT_SERVICES_DATA) | |
476 | continue; | |
477 | ||
7d68dc3f ML |
478 | /* Could not reserve boot area */ |
479 | if (!size) | |
480 | continue; | |
481 | ||
916f676f MG |
482 | free_bootmem_late(start, size); |
483 | } | |
78510792 JT |
484 | |
485 | efi_unmap_memmap(); | |
916f676f MG |
486 | } |
487 | ||
140bf275 | 488 | static int __init efi_systab_init(void *phys) |
5b83683f | 489 | { |
83e68189 | 490 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 OJ |
491 | efi_system_table_64_t *systab64; |
492 | u64 tmp = 0; | |
493 | ||
494 | systab64 = early_ioremap((unsigned long)phys, | |
495 | sizeof(*systab64)); | |
496 | if (systab64 == NULL) { | |
497 | pr_err("Couldn't map the system table!\n"); | |
498 | return -ENOMEM; | |
499 | } | |
500 | ||
501 | efi_systab.hdr = systab64->hdr; | |
502 | efi_systab.fw_vendor = systab64->fw_vendor; | |
503 | tmp |= systab64->fw_vendor; | |
504 | efi_systab.fw_revision = systab64->fw_revision; | |
505 | efi_systab.con_in_handle = systab64->con_in_handle; | |
506 | tmp |= systab64->con_in_handle; | |
507 | efi_systab.con_in = systab64->con_in; | |
508 | tmp |= systab64->con_in; | |
509 | efi_systab.con_out_handle = systab64->con_out_handle; | |
510 | tmp |= systab64->con_out_handle; | |
511 | efi_systab.con_out = systab64->con_out; | |
512 | tmp |= systab64->con_out; | |
513 | efi_systab.stderr_handle = systab64->stderr_handle; | |
514 | tmp |= systab64->stderr_handle; | |
515 | efi_systab.stderr = systab64->stderr; | |
516 | tmp |= systab64->stderr; | |
517 | efi_systab.runtime = (void *)(unsigned long)systab64->runtime; | |
518 | tmp |= systab64->runtime; | |
519 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; | |
520 | tmp |= systab64->boottime; | |
521 | efi_systab.nr_tables = systab64->nr_tables; | |
522 | efi_systab.tables = systab64->tables; | |
523 | tmp |= systab64->tables; | |
524 | ||
525 | early_iounmap(systab64, sizeof(*systab64)); | |
526 | #ifdef CONFIG_X86_32 | |
527 | if (tmp >> 32) { | |
528 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
529 | return -EINVAL; | |
530 | } | |
531 | #endif | |
532 | } else { | |
533 | efi_system_table_32_t *systab32; | |
534 | ||
535 | systab32 = early_ioremap((unsigned long)phys, | |
536 | sizeof(*systab32)); | |
537 | if (systab32 == NULL) { | |
538 | pr_err("Couldn't map the system table!\n"); | |
539 | return -ENOMEM; | |
540 | } | |
541 | ||
542 | efi_systab.hdr = systab32->hdr; | |
543 | efi_systab.fw_vendor = systab32->fw_vendor; | |
544 | efi_systab.fw_revision = systab32->fw_revision; | |
545 | efi_systab.con_in_handle = systab32->con_in_handle; | |
546 | efi_systab.con_in = systab32->con_in; | |
547 | efi_systab.con_out_handle = systab32->con_out_handle; | |
548 | efi_systab.con_out = systab32->con_out; | |
549 | efi_systab.stderr_handle = systab32->stderr_handle; | |
550 | efi_systab.stderr = systab32->stderr; | |
551 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
552 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
553 | efi_systab.nr_tables = systab32->nr_tables; | |
554 | efi_systab.tables = systab32->tables; | |
555 | ||
556 | early_iounmap(systab32, sizeof(*systab32)); | |
140bf275 | 557 | } |
1adbfa35 | 558 | |
5b83683f HY |
559 | efi.systab = &efi_systab; |
560 | ||
561 | /* | |
562 | * Verify the EFI Table | |
563 | */ | |
140bf275 | 564 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 565 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
566 | return -EINVAL; |
567 | } | |
5b83683f | 568 | if ((efi.systab->hdr.revision >> 16) == 0) |
e3cb3f5a | 569 | pr_err("Warning: System table version " |
5b83683f HY |
570 | "%d.%02d, expected 1.00 or greater!\n", |
571 | efi.systab->hdr.revision >> 16, | |
572 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
573 | |
574 | return 0; | |
83e7ee66 | 575 | } |
5b83683f | 576 | |
140bf275 | 577 | static int __init efi_runtime_init(void) |
83e7ee66 OJ |
578 | { |
579 | efi_runtime_services_t *runtime; | |
5b83683f HY |
580 | |
581 | /* | |
582 | * Check out the runtime services table. We need to map | |
583 | * the runtime services table so that we can grab the physical | |
584 | * address of several of the EFI runtime functions, needed to | |
585 | * set the firmware into virtual mode. | |
586 | */ | |
beacfaac HY |
587 | runtime = early_ioremap((unsigned long)efi.systab->runtime, |
588 | sizeof(efi_runtime_services_t)); | |
140bf275 | 589 | if (!runtime) { |
e3cb3f5a | 590 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
591 | return -ENOMEM; |
592 | } | |
593 | /* | |
594 | * We will only need *early* access to the following | |
11520e5e | 595 | * two EFI runtime services before set_virtual_address_map |
140bf275 OJ |
596 | * is invoked. |
597 | */ | |
11520e5e | 598 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; |
140bf275 OJ |
599 | efi_phys.set_virtual_address_map = |
600 | (efi_set_virtual_address_map_t *) | |
601 | runtime->set_virtual_address_map; | |
11520e5e LT |
602 | /* |
603 | * Make efi_get_time can be called before entering | |
604 | * virtual mode. | |
605 | */ | |
606 | efi.get_time = phys_efi_get_time; | |
beacfaac | 607 | early_iounmap(runtime, sizeof(efi_runtime_services_t)); |
140bf275 OJ |
608 | |
609 | return 0; | |
83e7ee66 | 610 | } |
5b83683f | 611 | |
140bf275 | 612 | static int __init efi_memmap_init(void) |
83e7ee66 | 613 | { |
5b83683f | 614 | /* Map the EFI memory map */ |
beacfaac HY |
615 | memmap.map = early_ioremap((unsigned long)memmap.phys_map, |
616 | memmap.nr_map * memmap.desc_size); | |
140bf275 | 617 | if (memmap.map == NULL) { |
e3cb3f5a | 618 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
619 | return -ENOMEM; |
620 | } | |
5b83683f | 621 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 622 | |
200001eb PJ |
623 | if (add_efi_memmap) |
624 | do_add_efi_memmap(); | |
140bf275 OJ |
625 | |
626 | return 0; | |
83e7ee66 OJ |
627 | } |
628 | ||
629 | void __init efi_init(void) | |
630 | { | |
631 | efi_char16_t *c16; | |
632 | char vendor[100] = "unknown"; | |
633 | int i = 0; | |
634 | void *tmp; | |
635 | ||
636 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
637 | if (boot_params.efi_info.efi_systab_hi || |
638 | boot_params.efi_info.efi_memmap_hi) { | |
639 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
640 | return; |
641 | } | |
83e7ee66 OJ |
642 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
643 | #else | |
644 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
645 | (boot_params.efi_info.efi_systab | |
646 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
647 | #endif |
648 | ||
83e68189 | 649 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 650 | return; |
83e68189 MF |
651 | |
652 | set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility); | |
83e7ee66 OJ |
653 | |
654 | /* | |
655 | * Show what we know for posterity | |
656 | */ | |
657 | c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); | |
658 | if (c16) { | |
659 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
660 | vendor[i] = *c16++; | |
661 | vendor[i] = '\0'; | |
662 | } else | |
e3cb3f5a | 663 | pr_err("Could not map the firmware vendor!\n"); |
83e7ee66 OJ |
664 | early_iounmap(tmp, 2); |
665 | ||
e3cb3f5a OJ |
666 | pr_info("EFI v%u.%.02u by %s\n", |
667 | efi.systab->hdr.revision >> 16, | |
668 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 669 | |
272686bf | 670 | if (efi_config_init(arch_tables)) |
140bf275 | 671 | return; |
83e68189 MF |
672 | |
673 | set_bit(EFI_CONFIG_TABLES, &x86_efi_facility); | |
83e7ee66 | 674 | |
1adbfa35 OJ |
675 | /* |
676 | * Note: We currently don't support runtime services on an EFI | |
677 | * that doesn't match the kernel 32/64-bit mode. | |
678 | */ | |
679 | ||
5189c2a7 | 680 | if (!efi_is_native()) |
1adbfa35 | 681 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 682 | else { |
fb834c7a | 683 | if (disable_runtime || efi_runtime_init()) |
83e68189 MF |
684 | return; |
685 | set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility); | |
140bf275 | 686 | } |
83e7ee66 | 687 | |
83e68189 | 688 | if (efi_memmap_init()) |
140bf275 | 689 | return; |
83e68189 MF |
690 | |
691 | set_bit(EFI_MEMMAP, &x86_efi_facility); | |
692 | ||
11520e5e | 693 | #ifdef CONFIG_X86_32 |
5189c2a7 | 694 | if (efi_is_native()) { |
1adbfa35 OJ |
695 | x86_platform.get_wallclock = efi_get_time; |
696 | x86_platform.set_wallclock = efi_set_rtc_mmss; | |
697 | } | |
11520e5e | 698 | #endif |
7bd867df | 699 | |
5b83683f HY |
700 | #if EFI_DEBUG |
701 | print_efi_memmap(); | |
702 | #endif | |
703 | } | |
704 | ||
2223af38 JT |
705 | void __init efi_late_init(void) |
706 | { | |
707 | efi_bgrt_init(); | |
708 | } | |
709 | ||
9cd2b07c MG |
710 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
711 | { | |
712 | u64 addr, npages; | |
713 | ||
714 | addr = md->virt_addr; | |
715 | npages = md->num_pages; | |
716 | ||
717 | memrange_efi_to_native(&addr, &npages); | |
718 | ||
719 | if (executable) | |
720 | set_memory_x(addr, npages); | |
721 | else | |
722 | set_memory_nx(addr, npages); | |
723 | } | |
724 | ||
a2172e25 HY |
725 | static void __init runtime_code_page_mkexec(void) |
726 | { | |
727 | efi_memory_desc_t *md; | |
a2172e25 HY |
728 | void *p; |
729 | ||
a2172e25 HY |
730 | /* Make EFI runtime service code area executable */ |
731 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
732 | md = p; | |
1c083eb2 HY |
733 | |
734 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
735 | continue; | |
736 | ||
9cd2b07c | 737 | efi_set_executable(md, true); |
a2172e25 | 738 | } |
a2172e25 | 739 | } |
a2172e25 | 740 | |
3e8fa263 MF |
741 | void efi_memory_uc(u64 addr, unsigned long size) |
742 | { | |
743 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
744 | u64 npages; | |
745 | ||
746 | npages = round_up(size, page_shift) / page_shift; | |
747 | memrange_efi_to_native(&addr, &npages); | |
748 | set_memory_uc(addr, npages); | |
749 | } | |
750 | ||
5b83683f HY |
751 | /* |
752 | * This function will switch the EFI runtime services to virtual mode. | |
753 | * Essentially, look through the EFI memmap and map every region that | |
754 | * has the runtime attribute bit set in its memory descriptor and update | |
755 | * that memory descriptor with the virtual address obtained from ioremap(). | |
756 | * This enables the runtime services to be called without having to | |
757 | * thunk back into physical mode for every invocation. | |
758 | */ | |
759 | void __init efi_enter_virtual_mode(void) | |
760 | { | |
202f9d0a | 761 | efi_memory_desc_t *md, *prev_md = NULL; |
5b83683f | 762 | efi_status_t status; |
1c083eb2 | 763 | unsigned long size; |
dda56e13 | 764 | u64 end, systab, start_pfn, end_pfn; |
7cb00b72 MG |
765 | void *p, *va, *new_memmap = NULL; |
766 | int count = 0; | |
5b83683f HY |
767 | |
768 | efi.systab = NULL; | |
202f9d0a | 769 | |
1adbfa35 OJ |
770 | /* |
771 | * We don't do virtual mode, since we don't do runtime services, on | |
772 | * non-native EFI | |
773 | */ | |
774 | ||
5189c2a7 | 775 | if (!efi_is_native()) { |
78510792 JT |
776 | efi_unmap_memmap(); |
777 | return; | |
778 | } | |
1adbfa35 | 779 | |
202f9d0a MG |
780 | /* Merge contiguous regions of the same type and attribute */ |
781 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
782 | u64 prev_size; | |
783 | md = p; | |
784 | ||
785 | if (!prev_md) { | |
786 | prev_md = md; | |
787 | continue; | |
788 | } | |
789 | ||
790 | if (prev_md->type != md->type || | |
791 | prev_md->attribute != md->attribute) { | |
792 | prev_md = md; | |
793 | continue; | |
794 | } | |
795 | ||
796 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
797 | ||
798 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
799 | prev_md->num_pages += md->num_pages; | |
800 | md->type = EFI_RESERVED_TYPE; | |
801 | md->attribute = 0; | |
802 | continue; | |
803 | } | |
804 | prev_md = md; | |
805 | } | |
806 | ||
5b83683f HY |
807 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
808 | md = p; | |
916f676f MG |
809 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && |
810 | md->type != EFI_BOOT_SERVICES_CODE && | |
811 | md->type != EFI_BOOT_SERVICES_DATA) | |
5b83683f | 812 | continue; |
1c083eb2 HY |
813 | |
814 | size = md->num_pages << EFI_PAGE_SHIFT; | |
815 | end = md->phys_addr + size; | |
816 | ||
dda56e13 | 817 | start_pfn = PFN_DOWN(md->phys_addr); |
dd39ecf5 | 818 | end_pfn = PFN_UP(end); |
dda56e13 | 819 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { |
1c083eb2 | 820 | va = __va(md->phys_addr); |
3e8fa263 MF |
821 | |
822 | if (!(md->attribute & EFI_MEMORY_WB)) | |
823 | efi_memory_uc((u64)(unsigned long)va, size); | |
824 | } else | |
825 | va = efi_ioremap(md->phys_addr, size, | |
826 | md->type, md->attribute); | |
1c083eb2 | 827 | |
1c083eb2 HY |
828 | md->virt_addr = (u64) (unsigned long) va; |
829 | ||
830 | if (!va) { | |
e3cb3f5a | 831 | pr_err("ioremap of 0x%llX failed!\n", |
5b83683f | 832 | (unsigned long long)md->phys_addr); |
1c083eb2 HY |
833 | continue; |
834 | } | |
835 | ||
836 | systab = (u64) (unsigned long) efi_phys.systab; | |
837 | if (md->phys_addr <= systab && systab < end) { | |
838 | systab += md->virt_addr - md->phys_addr; | |
839 | efi.systab = (efi_system_table_t *) (unsigned long) systab; | |
840 | } | |
7cb00b72 MG |
841 | new_memmap = krealloc(new_memmap, |
842 | (count + 1) * memmap.desc_size, | |
843 | GFP_KERNEL); | |
844 | memcpy(new_memmap + (count * memmap.desc_size), md, | |
845 | memmap.desc_size); | |
846 | count++; | |
5b83683f HY |
847 | } |
848 | ||
849 | BUG_ON(!efi.systab); | |
850 | ||
851 | status = phys_efi_set_virtual_address_map( | |
7cb00b72 | 852 | memmap.desc_size * count, |
5b83683f HY |
853 | memmap.desc_size, |
854 | memmap.desc_version, | |
7cb00b72 | 855 | (efi_memory_desc_t *)__pa(new_memmap)); |
5b83683f HY |
856 | |
857 | if (status != EFI_SUCCESS) { | |
e3cb3f5a OJ |
858 | pr_alert("Unable to switch EFI into virtual mode " |
859 | "(status=%lx)!\n", status); | |
5b83683f HY |
860 | panic("EFI call to SetVirtualAddressMap() failed!"); |
861 | } | |
862 | ||
863 | /* | |
864 | * Now that EFI is in virtual mode, update the function | |
865 | * pointers in the runtime service table to the new virtual addresses. | |
866 | * | |
867 | * Call EFI services through wrapper functions. | |
868 | */ | |
712ba9e9 | 869 | efi.runtime_version = efi_systab.hdr.revision; |
5b83683f HY |
870 | efi.get_time = virt_efi_get_time; |
871 | efi.set_time = virt_efi_set_time; | |
872 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
873 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
874 | efi.get_variable = virt_efi_get_variable; | |
875 | efi.get_next_variable = virt_efi_get_next_variable; | |
876 | efi.set_variable = virt_efi_set_variable; | |
877 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
878 | efi.reset_system = virt_efi_reset_system; | |
2b5e8ef3 | 879 | efi.set_virtual_address_map = NULL; |
3b370237 MG |
880 | efi.query_variable_info = virt_efi_query_variable_info; |
881 | efi.update_capsule = virt_efi_update_capsule; | |
882 | efi.query_capsule_caps = virt_efi_query_capsule_caps; | |
4de0d4a6 HY |
883 | if (__supported_pte_mask & _PAGE_NX) |
884 | runtime_code_page_mkexec(); | |
1adbfa35 | 885 | |
7cb00b72 | 886 | kfree(new_memmap); |
f8b84043 MG |
887 | |
888 | /* clean DUMMY object */ | |
889 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
890 | EFI_VARIABLE_NON_VOLATILE | | |
891 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
892 | EFI_VARIABLE_RUNTIME_ACCESS, | |
893 | 0, NULL); | |
5b83683f HY |
894 | } |
895 | ||
896 | /* | |
897 | * Convenience functions to obtain memory types and attributes | |
898 | */ | |
899 | u32 efi_mem_type(unsigned long phys_addr) | |
900 | { | |
901 | efi_memory_desc_t *md; | |
902 | void *p; | |
903 | ||
83e68189 MF |
904 | if (!efi_enabled(EFI_MEMMAP)) |
905 | return 0; | |
906 | ||
5b83683f HY |
907 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
908 | md = p; | |
909 | if ((md->phys_addr <= phys_addr) && | |
910 | (phys_addr < (md->phys_addr + | |
911 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
912 | return md->type; | |
913 | } | |
914 | return 0; | |
915 | } | |
916 | ||
917 | u64 efi_mem_attributes(unsigned long phys_addr) | |
918 | { | |
919 | efi_memory_desc_t *md; | |
920 | void *p; | |
921 | ||
922 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
923 | md = p; | |
924 | if ((md->phys_addr <= phys_addr) && | |
925 | (phys_addr < (md->phys_addr + | |
926 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
927 | return md->attribute; | |
928 | } | |
929 | return 0; | |
930 | } | |
a6e4d5a0 MF |
931 | |
932 | /* | |
933 | * Some firmware has serious problems when using more than 50% of the EFI | |
934 | * variable store, i.e. it triggers bugs that can brick machines. Ensure that | |
935 | * we never use more than this safe limit. | |
936 | * | |
937 | * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable | |
938 | * store. | |
939 | */ | |
940 | efi_status_t efi_query_variable_store(u32 attributes, unsigned long size) | |
941 | { | |
942 | efi_status_t status; | |
943 | u64 storage_size, remaining_size, max_size; | |
944 | ||
f8b84043 MG |
945 | if (!(attributes & EFI_VARIABLE_NON_VOLATILE)) |
946 | return 0; | |
947 | ||
a6e4d5a0 MF |
948 | status = efi.query_variable_info(attributes, &storage_size, |
949 | &remaining_size, &max_size); | |
950 | if (status != EFI_SUCCESS) | |
951 | return status; | |
952 | ||
31ff2f20 MG |
953 | /* |
954 | * Some firmware implementations refuse to boot if there's insufficient | |
955 | * space in the variable store. We account for that by refusing the | |
956 | * write if permitting it would reduce the available space to under | |
f8b84043 | 957 | * 5KB. This figure was provided by Samsung, so should be safe. |
31ff2f20 | 958 | */ |
f8b84043 MG |
959 | if ((remaining_size - size < EFI_MIN_RESERVE) && |
960 | !efi_no_storage_paranoia) { | |
961 | ||
962 | /* | |
963 | * Triggering garbage collection may require that the firmware | |
964 | * generate a real EFI_OUT_OF_RESOURCES error. We can force | |
965 | * that by attempting to use more space than is available. | |
966 | */ | |
967 | unsigned long dummy_size = remaining_size + 1024; | |
b8cb62f8 BH |
968 | void *dummy = kzalloc(dummy_size, GFP_ATOMIC); |
969 | ||
970 | if (!dummy) | |
971 | return EFI_OUT_OF_RESOURCES; | |
f8b84043 MG |
972 | |
973 | status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
974 | EFI_VARIABLE_NON_VOLATILE | | |
975 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
976 | EFI_VARIABLE_RUNTIME_ACCESS, | |
977 | dummy_size, dummy); | |
978 | ||
979 | if (status == EFI_SUCCESS) { | |
980 | /* | |
981 | * This should have failed, so if it didn't make sure | |
982 | * that we delete it... | |
983 | */ | |
984 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
985 | EFI_VARIABLE_NON_VOLATILE | | |
986 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
987 | EFI_VARIABLE_RUNTIME_ACCESS, | |
988 | 0, dummy); | |
989 | } | |
7791c842 | 990 | |
b8cb62f8 BH |
991 | kfree(dummy); |
992 | ||
f8b84043 MG |
993 | /* |
994 | * The runtime code may now have triggered a garbage collection | |
995 | * run, so check the variable info again | |
996 | */ | |
997 | status = efi.query_variable_info(attributes, &storage_size, | |
998 | &remaining_size, &max_size); | |
8c58bf3e | 999 | |
f8b84043 MG |
1000 | if (status != EFI_SUCCESS) |
1001 | return status; | |
1002 | ||
1003 | /* | |
1004 | * There still isn't enough room, so return an error | |
1005 | */ | |
1006 | if (remaining_size - size < EFI_MIN_RESERVE) | |
1007 | return EFI_OUT_OF_RESOURCES; | |
1008 | } | |
a6e4d5a0 MF |
1009 | |
1010 | return EFI_SUCCESS; | |
1011 | } | |
3668011d | 1012 | EXPORT_SYMBOL_GPL(efi_query_variable_store); |