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> | |
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> |
a5d90c92 | 55 | #include <asm/uv/uv.h> |
5b83683f | 56 | |
f4fccac0 | 57 | #define EFI_DEBUG |
5b83683f | 58 | |
f8b84043 MG |
59 | #define EFI_MIN_RESERVE 5120 |
60 | ||
61 | #define EFI_DUMMY_GUID \ | |
62 | EFI_GUID(0x4424ac57, 0xbe4b, 0x47dd, 0x9e, 0x97, 0xed, 0x50, 0xf0, 0x9f, 0x92, 0xa9) | |
63 | ||
64 | static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 }; | |
31ff2f20 | 65 | |
5b83683f HY |
66 | struct efi_memory_map memmap; |
67 | ||
ecaea42e | 68 | static struct efi efi_phys __initdata; |
5b83683f HY |
69 | static efi_system_table_t efi_systab __initdata; |
70 | ||
9b7d2049 | 71 | static efi_config_table_type_t arch_tables[] __initdata = { |
272686bf LL |
72 | #ifdef CONFIG_X86_UV |
73 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, | |
74 | #endif | |
722da9d2 | 75 | {NULL_GUID, NULL, NULL}, |
272686bf LL |
76 | }; |
77 | ||
1fec0533 | 78 | u64 efi_setup; /* efi setup_data physical address */ |
926172d4 | 79 | |
9b7d2049 | 80 | static bool disable_runtime __initdata = false; |
8b2cb7a8 HY |
81 | static int __init setup_noefi(char *arg) |
82 | { | |
fb834c7a | 83 | disable_runtime = true; |
8b2cb7a8 HY |
84 | return 0; |
85 | } | |
86 | early_param("noefi", setup_noefi); | |
87 | ||
200001eb PJ |
88 | int add_efi_memmap; |
89 | EXPORT_SYMBOL(add_efi_memmap); | |
90 | ||
91 | static int __init setup_add_efi_memmap(char *arg) | |
92 | { | |
93 | add_efi_memmap = 1; | |
94 | return 0; | |
95 | } | |
96 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
97 | ||
8c58bf3e RW |
98 | static bool efi_no_storage_paranoia; |
99 | ||
100 | static int __init setup_storage_paranoia(char *arg) | |
101 | { | |
102 | efi_no_storage_paranoia = true; | |
103 | return 0; | |
104 | } | |
105 | early_param("efi_no_storage_paranoia", setup_storage_paranoia); | |
106 | ||
5b83683f HY |
107 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
108 | { | |
ef68c8f8 JB |
109 | unsigned long flags; |
110 | efi_status_t status; | |
111 | ||
112 | spin_lock_irqsave(&rtc_lock, flags); | |
113 | status = efi_call_virt2(get_time, tm, tc); | |
114 | spin_unlock_irqrestore(&rtc_lock, flags); | |
115 | return status; | |
5b83683f HY |
116 | } |
117 | ||
118 | static efi_status_t virt_efi_set_time(efi_time_t *tm) | |
119 | { | |
ef68c8f8 JB |
120 | unsigned long flags; |
121 | efi_status_t status; | |
122 | ||
123 | spin_lock_irqsave(&rtc_lock, flags); | |
124 | status = efi_call_virt1(set_time, tm); | |
125 | spin_unlock_irqrestore(&rtc_lock, flags); | |
126 | return status; | |
5b83683f HY |
127 | } |
128 | ||
129 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, | |
130 | efi_bool_t *pending, | |
131 | efi_time_t *tm) | |
132 | { | |
ef68c8f8 JB |
133 | unsigned long flags; |
134 | efi_status_t status; | |
135 | ||
136 | spin_lock_irqsave(&rtc_lock, flags); | |
137 | status = efi_call_virt3(get_wakeup_time, | |
138 | enabled, pending, tm); | |
139 | spin_unlock_irqrestore(&rtc_lock, flags); | |
140 | return status; | |
5b83683f HY |
141 | } |
142 | ||
143 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
144 | { | |
ef68c8f8 JB |
145 | unsigned long flags; |
146 | efi_status_t status; | |
147 | ||
148 | spin_lock_irqsave(&rtc_lock, flags); | |
149 | status = efi_call_virt2(set_wakeup_time, | |
150 | enabled, tm); | |
151 | spin_unlock_irqrestore(&rtc_lock, flags); | |
152 | return status; | |
5b83683f HY |
153 | } |
154 | ||
155 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, | |
156 | efi_guid_t *vendor, | |
157 | u32 *attr, | |
158 | unsigned long *data_size, | |
159 | void *data) | |
160 | { | |
161 | return efi_call_virt5(get_variable, | |
162 | name, vendor, attr, | |
163 | data_size, data); | |
164 | } | |
165 | ||
166 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, | |
167 | efi_char16_t *name, | |
168 | efi_guid_t *vendor) | |
169 | { | |
f8b84043 MG |
170 | return efi_call_virt3(get_next_variable, |
171 | name_size, name, vendor); | |
5b83683f HY |
172 | } |
173 | ||
174 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, | |
175 | efi_guid_t *vendor, | |
f7a2d73f | 176 | u32 attr, |
5b83683f HY |
177 | unsigned long data_size, |
178 | void *data) | |
179 | { | |
f8b84043 MG |
180 | return efi_call_virt5(set_variable, |
181 | name, vendor, attr, | |
182 | data_size, data); | |
5b83683f HY |
183 | } |
184 | ||
3b370237 MG |
185 | static efi_status_t virt_efi_query_variable_info(u32 attr, |
186 | u64 *storage_space, | |
187 | u64 *remaining_space, | |
188 | u64 *max_variable_size) | |
189 | { | |
190 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
191 | return EFI_UNSUPPORTED; | |
192 | ||
193 | return efi_call_virt4(query_variable_info, attr, storage_space, | |
194 | remaining_space, max_variable_size); | |
195 | } | |
196 | ||
5b83683f HY |
197 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) |
198 | { | |
199 | return efi_call_virt1(get_next_high_mono_count, count); | |
200 | } | |
201 | ||
202 | static void virt_efi_reset_system(int reset_type, | |
203 | efi_status_t status, | |
204 | unsigned long data_size, | |
205 | efi_char16_t *data) | |
206 | { | |
207 | efi_call_virt4(reset_system, reset_type, status, | |
208 | data_size, data); | |
209 | } | |
210 | ||
3b370237 MG |
211 | static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, |
212 | unsigned long count, | |
213 | unsigned long sg_list) | |
214 | { | |
215 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
216 | return EFI_UNSUPPORTED; | |
217 | ||
218 | return efi_call_virt3(update_capsule, capsules, count, sg_list); | |
219 | } | |
220 | ||
221 | static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, | |
222 | unsigned long count, | |
223 | u64 *max_size, | |
224 | int *reset_type) | |
225 | { | |
226 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
227 | return EFI_UNSUPPORTED; | |
228 | ||
229 | return efi_call_virt4(query_capsule_caps, capsules, count, max_size, | |
230 | reset_type); | |
231 | } | |
232 | ||
5b83683f HY |
233 | static efi_status_t __init phys_efi_set_virtual_address_map( |
234 | unsigned long memory_map_size, | |
235 | unsigned long descriptor_size, | |
236 | u32 descriptor_version, | |
237 | efi_memory_desc_t *virtual_map) | |
238 | { | |
239 | efi_status_t status; | |
240 | ||
241 | efi_call_phys_prelog(); | |
242 | status = efi_call_phys4(efi_phys.set_virtual_address_map, | |
243 | memory_map_size, descriptor_size, | |
244 | descriptor_version, virtual_map); | |
245 | efi_call_phys_epilog(); | |
246 | return status; | |
247 | } | |
248 | ||
11520e5e LT |
249 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, |
250 | efi_time_cap_t *tc) | |
251 | { | |
252 | unsigned long flags; | |
253 | efi_status_t status; | |
254 | ||
255 | spin_lock_irqsave(&rtc_lock, flags); | |
256 | efi_call_phys_prelog(); | |
257 | status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), | |
258 | virt_to_phys(tc)); | |
259 | efi_call_phys_epilog(); | |
260 | spin_unlock_irqrestore(&rtc_lock, flags); | |
261 | return status; | |
262 | } | |
263 | ||
3565184e | 264 | int efi_set_rtc_mmss(const struct timespec *now) |
5b83683f | 265 | { |
3565184e | 266 | unsigned long nowtime = now->tv_sec; |
9b7d2049 JP |
267 | efi_status_t status; |
268 | efi_time_t eft; | |
269 | efi_time_cap_t cap; | |
3195ef59 | 270 | struct rtc_time tm; |
5b83683f HY |
271 | |
272 | status = efi.get_time(&eft, &cap); | |
273 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 274 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
275 | return -1; |
276 | } | |
277 | ||
3195ef59 PB |
278 | rtc_time_to_tm(nowtime, &tm); |
279 | if (!rtc_valid_tm(&tm)) { | |
280 | eft.year = tm.tm_year + 1900; | |
281 | eft.month = tm.tm_mon + 1; | |
282 | eft.day = tm.tm_mday; | |
283 | eft.minute = tm.tm_min; | |
284 | eft.second = tm.tm_sec; | |
285 | eft.nanosecond = 0; | |
286 | } else { | |
9b7d2049 JP |
287 | pr_err("%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n", |
288 | __func__, nowtime); | |
3195ef59 PB |
289 | return -1; |
290 | } | |
5b83683f HY |
291 | |
292 | status = efi.set_time(&eft); | |
293 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 294 | pr_err("Oops: efitime: can't write time!\n"); |
5b83683f HY |
295 | return -1; |
296 | } | |
297 | return 0; | |
298 | } | |
299 | ||
3565184e | 300 | void efi_get_time(struct timespec *now) |
5b83683f HY |
301 | { |
302 | efi_status_t status; | |
303 | efi_time_t eft; | |
304 | efi_time_cap_t cap; | |
305 | ||
306 | status = efi.get_time(&eft, &cap); | |
307 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 308 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f | 309 | |
3565184e DV |
310 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
311 | eft.minute, eft.second); | |
312 | now->tv_nsec = 0; | |
5b83683f HY |
313 | } |
314 | ||
69c91893 PJ |
315 | /* |
316 | * Tell the kernel about the EFI memory map. This might include | |
317 | * more than the max 128 entries that can fit in the e820 legacy | |
318 | * (zeropage) memory map. | |
319 | */ | |
320 | ||
200001eb | 321 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
322 | { |
323 | void *p; | |
324 | ||
325 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
326 | efi_memory_desc_t *md = p; | |
327 | unsigned long long start = md->phys_addr; | |
328 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
329 | int e820_type; | |
330 | ||
e2a71476 CW |
331 | switch (md->type) { |
332 | case EFI_LOADER_CODE: | |
333 | case EFI_LOADER_DATA: | |
334 | case EFI_BOOT_SERVICES_CODE: | |
335 | case EFI_BOOT_SERVICES_DATA: | |
336 | case EFI_CONVENTIONAL_MEMORY: | |
337 | if (md->attribute & EFI_MEMORY_WB) | |
338 | e820_type = E820_RAM; | |
339 | else | |
340 | e820_type = E820_RESERVED; | |
341 | break; | |
342 | case EFI_ACPI_RECLAIM_MEMORY: | |
343 | e820_type = E820_ACPI; | |
344 | break; | |
345 | case EFI_ACPI_MEMORY_NVS: | |
346 | e820_type = E820_NVS; | |
347 | break; | |
348 | case EFI_UNUSABLE_MEMORY: | |
349 | e820_type = E820_UNUSABLE; | |
350 | break; | |
351 | default: | |
352 | /* | |
353 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
354 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
355 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
356 | */ | |
69c91893 | 357 | e820_type = E820_RESERVED; |
e2a71476 CW |
358 | break; |
359 | } | |
d0be6bde | 360 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
361 | } |
362 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
363 | } | |
364 | ||
1adbfa35 | 365 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 366 | { |
15b9c359 | 367 | struct efi_info *e = &boot_params.efi_info; |
ecacf09f HY |
368 | unsigned long pmap; |
369 | ||
05486fa7 | 370 | #ifdef CONFIG_X86_32 |
1adbfa35 | 371 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 372 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
373 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
374 | return -EINVAL; | |
375 | } | |
15b9c359 | 376 | pmap = e->efi_memmap; |
05486fa7 | 377 | #else |
15b9c359 | 378 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 379 | #endif |
15b9c359 BP |
380 | memmap.phys_map = (void *)pmap; |
381 | memmap.nr_map = e->efi_memmap_size / | |
382 | e->efi_memdesc_size; | |
383 | memmap.desc_size = e->efi_memdesc_size; | |
384 | memmap.desc_version = e->efi_memdesc_version; | |
385 | ||
24aa0788 | 386 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 | 387 | |
258f6fd7 LL |
388 | efi.memmap = &memmap; |
389 | ||
1adbfa35 | 390 | return 0; |
ecacf09f HY |
391 | } |
392 | ||
5b83683f HY |
393 | static void __init print_efi_memmap(void) |
394 | { | |
f4fccac0 | 395 | #ifdef EFI_DEBUG |
5b83683f HY |
396 | efi_memory_desc_t *md; |
397 | void *p; | |
398 | int i; | |
399 | ||
400 | for (p = memmap.map, i = 0; | |
401 | p < memmap.map_end; | |
402 | p += memmap.desc_size, i++) { | |
403 | md = p; | |
9b7d2049 | 404 | pr_info("mem%02u: type=%u, attr=0x%llx, range=[0x%016llx-0x%016llx) (%lluMB)\n", |
5b83683f HY |
405 | i, md->type, md->attribute, md->phys_addr, |
406 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
407 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
408 | } | |
5b83683f | 409 | #endif /* EFI_DEBUG */ |
f4fccac0 | 410 | } |
5b83683f | 411 | |
916f676f MG |
412 | void __init efi_reserve_boot_services(void) |
413 | { | |
414 | void *p; | |
415 | ||
416 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
417 | efi_memory_desc_t *md = p; | |
7d68dc3f ML |
418 | u64 start = md->phys_addr; |
419 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
916f676f MG |
420 | |
421 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
422 | md->type != EFI_BOOT_SERVICES_DATA) | |
423 | continue; | |
7d68dc3f ML |
424 | /* Only reserve where possible: |
425 | * - Not within any already allocated areas | |
426 | * - Not over any memory area (really needed, if above?) | |
427 | * - Not within any part of the kernel | |
428 | * - Not the bios reserved area | |
429 | */ | |
a7f84f03 | 430 | if ((start + size > __pa_symbol(_text) |
fc8d7826 | 431 | && start <= __pa_symbol(_end)) || |
7d68dc3f | 432 | !e820_all_mapped(start, start+size, E820_RAM) || |
bf61549a | 433 | memblock_is_region_reserved(start, size)) { |
7d68dc3f ML |
434 | /* Could not reserve, skip it */ |
435 | md->num_pages = 0; | |
9b7d2049 JP |
436 | memblock_dbg("Could not reserve boot range [0x%010llx-0x%010llx]\n", |
437 | start, start+size-1); | |
7d68dc3f | 438 | } else |
24aa0788 | 439 | memblock_reserve(start, size); |
916f676f MG |
440 | } |
441 | } | |
442 | ||
5189c2a7 | 443 | void __init efi_unmap_memmap(void) |
78510792 | 444 | { |
3e909599 | 445 | clear_bit(EFI_MEMMAP, &efi.flags); |
78510792 JT |
446 | if (memmap.map) { |
447 | early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); | |
448 | memmap.map = NULL; | |
449 | } | |
450 | } | |
451 | ||
452 | void __init efi_free_boot_services(void) | |
916f676f MG |
453 | { |
454 | void *p; | |
455 | ||
5189c2a7 | 456 | if (!efi_is_native()) |
78510792 JT |
457 | return; |
458 | ||
916f676f MG |
459 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
460 | efi_memory_desc_t *md = p; | |
461 | unsigned long long start = md->phys_addr; | |
462 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
463 | ||
464 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
465 | md->type != EFI_BOOT_SERVICES_DATA) | |
466 | continue; | |
467 | ||
7d68dc3f ML |
468 | /* Could not reserve boot area */ |
469 | if (!size) | |
470 | continue; | |
471 | ||
916f676f MG |
472 | free_bootmem_late(start, size); |
473 | } | |
78510792 JT |
474 | |
475 | efi_unmap_memmap(); | |
916f676f MG |
476 | } |
477 | ||
140bf275 | 478 | static int __init efi_systab_init(void *phys) |
5b83683f | 479 | { |
83e68189 | 480 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 481 | efi_system_table_64_t *systab64; |
1fec0533 | 482 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
483 | u64 tmp = 0; |
484 | ||
1fec0533 DY |
485 | if (efi_setup) { |
486 | data = early_memremap(efi_setup, sizeof(*data)); | |
487 | if (!data) | |
488 | return -ENOMEM; | |
489 | } | |
1adbfa35 OJ |
490 | systab64 = early_ioremap((unsigned long)phys, |
491 | sizeof(*systab64)); | |
492 | if (systab64 == NULL) { | |
493 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 DY |
494 | if (data) |
495 | early_iounmap(data, sizeof(*data)); | |
1adbfa35 OJ |
496 | return -ENOMEM; |
497 | } | |
498 | ||
499 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
500 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
501 | systab64->fw_vendor; | |
502 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
503 | efi_systab.fw_revision = systab64->fw_revision; |
504 | efi_systab.con_in_handle = systab64->con_in_handle; | |
505 | tmp |= systab64->con_in_handle; | |
506 | efi_systab.con_in = systab64->con_in; | |
507 | tmp |= systab64->con_in; | |
508 | efi_systab.con_out_handle = systab64->con_out_handle; | |
509 | tmp |= systab64->con_out_handle; | |
510 | efi_systab.con_out = systab64->con_out; | |
511 | tmp |= systab64->con_out; | |
512 | efi_systab.stderr_handle = systab64->stderr_handle; | |
513 | tmp |= systab64->stderr_handle; | |
514 | efi_systab.stderr = systab64->stderr; | |
515 | tmp |= systab64->stderr; | |
1fec0533 DY |
516 | efi_systab.runtime = data ? |
517 | (void *)(unsigned long)data->runtime : | |
518 | (void *)(unsigned long)systab64->runtime; | |
519 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
520 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
521 | tmp |= systab64->boottime; | |
522 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
523 | efi_systab.tables = data ? (unsigned long)data->tables : |
524 | systab64->tables; | |
525 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 OJ |
526 | |
527 | early_iounmap(systab64, sizeof(*systab64)); | |
1fec0533 DY |
528 | if (data) |
529 | early_iounmap(data, sizeof(*data)); | |
1adbfa35 OJ |
530 | #ifdef CONFIG_X86_32 |
531 | if (tmp >> 32) { | |
532 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
533 | return -EINVAL; | |
534 | } | |
535 | #endif | |
536 | } else { | |
537 | efi_system_table_32_t *systab32; | |
538 | ||
539 | systab32 = early_ioremap((unsigned long)phys, | |
540 | sizeof(*systab32)); | |
541 | if (systab32 == NULL) { | |
542 | pr_err("Couldn't map the system table!\n"); | |
543 | return -ENOMEM; | |
544 | } | |
545 | ||
546 | efi_systab.hdr = systab32->hdr; | |
547 | efi_systab.fw_vendor = systab32->fw_vendor; | |
548 | efi_systab.fw_revision = systab32->fw_revision; | |
549 | efi_systab.con_in_handle = systab32->con_in_handle; | |
550 | efi_systab.con_in = systab32->con_in; | |
551 | efi_systab.con_out_handle = systab32->con_out_handle; | |
552 | efi_systab.con_out = systab32->con_out; | |
553 | efi_systab.stderr_handle = systab32->stderr_handle; | |
554 | efi_systab.stderr = systab32->stderr; | |
555 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
556 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
557 | efi_systab.nr_tables = systab32->nr_tables; | |
558 | efi_systab.tables = systab32->tables; | |
559 | ||
560 | early_iounmap(systab32, sizeof(*systab32)); | |
140bf275 | 561 | } |
1adbfa35 | 562 | |
5b83683f HY |
563 | efi.systab = &efi_systab; |
564 | ||
565 | /* | |
566 | * Verify the EFI Table | |
567 | */ | |
140bf275 | 568 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 569 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
570 | return -EINVAL; |
571 | } | |
5b83683f | 572 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 573 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
574 | efi.systab->hdr.revision >> 16, |
575 | efi.systab->hdr.revision & 0xffff); | |
140bf275 | 576 | |
0f8093a9 MF |
577 | set_bit(EFI_SYSTEM_TABLES, &efi.flags); |
578 | ||
140bf275 | 579 | return 0; |
83e7ee66 | 580 | } |
5b83683f | 581 | |
140bf275 | 582 | static int __init efi_runtime_init(void) |
83e7ee66 OJ |
583 | { |
584 | efi_runtime_services_t *runtime; | |
5b83683f HY |
585 | |
586 | /* | |
587 | * Check out the runtime services table. We need to map | |
588 | * the runtime services table so that we can grab the physical | |
589 | * address of several of the EFI runtime functions, needed to | |
590 | * set the firmware into virtual mode. | |
591 | */ | |
beacfaac HY |
592 | runtime = early_ioremap((unsigned long)efi.systab->runtime, |
593 | sizeof(efi_runtime_services_t)); | |
140bf275 | 594 | if (!runtime) { |
e3cb3f5a | 595 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
596 | return -ENOMEM; |
597 | } | |
598 | /* | |
599 | * We will only need *early* access to the following | |
11520e5e | 600 | * two EFI runtime services before set_virtual_address_map |
140bf275 OJ |
601 | * is invoked. |
602 | */ | |
11520e5e | 603 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; |
140bf275 OJ |
604 | efi_phys.set_virtual_address_map = |
605 | (efi_set_virtual_address_map_t *) | |
606 | runtime->set_virtual_address_map; | |
11520e5e LT |
607 | /* |
608 | * Make efi_get_time can be called before entering | |
609 | * virtual mode. | |
610 | */ | |
611 | efi.get_time = phys_efi_get_time; | |
beacfaac | 612 | early_iounmap(runtime, sizeof(efi_runtime_services_t)); |
140bf275 | 613 | |
0f8093a9 MF |
614 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
615 | ||
140bf275 | 616 | return 0; |
83e7ee66 | 617 | } |
5b83683f | 618 | |
140bf275 | 619 | static int __init efi_memmap_init(void) |
83e7ee66 | 620 | { |
5b83683f | 621 | /* Map the EFI memory map */ |
beacfaac HY |
622 | memmap.map = early_ioremap((unsigned long)memmap.phys_map, |
623 | memmap.nr_map * memmap.desc_size); | |
140bf275 | 624 | if (memmap.map == NULL) { |
e3cb3f5a | 625 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
626 | return -ENOMEM; |
627 | } | |
5b83683f | 628 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 629 | |
200001eb PJ |
630 | if (add_efi_memmap) |
631 | do_add_efi_memmap(); | |
140bf275 | 632 | |
0f8093a9 MF |
633 | set_bit(EFI_MEMMAP, &efi.flags); |
634 | ||
140bf275 | 635 | return 0; |
83e7ee66 OJ |
636 | } |
637 | ||
1fec0533 DY |
638 | /* |
639 | * A number of config table entries get remapped to virtual addresses | |
640 | * after entering EFI virtual mode. However, the kexec kernel requires | |
641 | * their physical addresses therefore we pass them via setup_data and | |
642 | * correct those entries to their respective physical addresses here. | |
643 | * | |
644 | * Currently only handles smbios which is necessary for some firmware | |
645 | * implementation. | |
646 | */ | |
647 | static int __init efi_reuse_config(u64 tables, int nr_tables) | |
648 | { | |
649 | int i, sz, ret = 0; | |
650 | void *p, *tablep; | |
651 | struct efi_setup_data *data; | |
652 | ||
653 | if (!efi_setup) | |
654 | return 0; | |
655 | ||
656 | if (!efi_enabled(EFI_64BIT)) | |
657 | return 0; | |
658 | ||
659 | data = early_memremap(efi_setup, sizeof(*data)); | |
660 | if (!data) { | |
661 | ret = -ENOMEM; | |
662 | goto out; | |
663 | } | |
664 | ||
665 | if (!data->smbios) | |
666 | goto out_memremap; | |
667 | ||
668 | sz = sizeof(efi_config_table_64_t); | |
669 | ||
670 | p = tablep = early_memremap(tables, nr_tables * sz); | |
671 | if (!p) { | |
672 | pr_err("Could not map Configuration table!\n"); | |
673 | ret = -ENOMEM; | |
674 | goto out_memremap; | |
675 | } | |
676 | ||
677 | for (i = 0; i < efi.systab->nr_tables; i++) { | |
678 | efi_guid_t guid; | |
679 | ||
680 | guid = ((efi_config_table_64_t *)p)->guid; | |
681 | ||
682 | if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) | |
683 | ((efi_config_table_64_t *)p)->table = data->smbios; | |
684 | p += sz; | |
685 | } | |
686 | early_iounmap(tablep, nr_tables * sz); | |
687 | ||
688 | out_memremap: | |
689 | early_iounmap(data, sizeof(*data)); | |
690 | out: | |
691 | return ret; | |
692 | } | |
693 | ||
83e7ee66 OJ |
694 | void __init efi_init(void) |
695 | { | |
696 | efi_char16_t *c16; | |
697 | char vendor[100] = "unknown"; | |
698 | int i = 0; | |
699 | void *tmp; | |
700 | ||
701 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
702 | if (boot_params.efi_info.efi_systab_hi || |
703 | boot_params.efi_info.efi_memmap_hi) { | |
704 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
705 | return; |
706 | } | |
83e7ee66 OJ |
707 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
708 | #else | |
709 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
710 | (boot_params.efi_info.efi_systab | |
711 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
712 | #endif |
713 | ||
83e68189 | 714 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 715 | return; |
83e68189 | 716 | |
3e909599 | 717 | set_bit(EFI_SYSTEM_TABLES, &efi.flags); |
83e7ee66 | 718 | |
a0998eb1 DY |
719 | efi.config_table = (unsigned long)efi.systab->tables; |
720 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
721 | efi.runtime = (unsigned long)efi.systab->runtime; | |
722 | ||
83e7ee66 OJ |
723 | /* |
724 | * Show what we know for posterity | |
725 | */ | |
726 | c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); | |
727 | if (c16) { | |
728 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
729 | vendor[i] = *c16++; | |
730 | vendor[i] = '\0'; | |
731 | } else | |
e3cb3f5a | 732 | pr_err("Could not map the firmware vendor!\n"); |
83e7ee66 OJ |
733 | early_iounmap(tmp, 2); |
734 | ||
e3cb3f5a OJ |
735 | pr_info("EFI v%u.%.02u by %s\n", |
736 | efi.systab->hdr.revision >> 16, | |
737 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 738 | |
1fec0533 DY |
739 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
740 | return; | |
741 | ||
272686bf | 742 | if (efi_config_init(arch_tables)) |
140bf275 | 743 | return; |
83e68189 | 744 | |
1adbfa35 OJ |
745 | /* |
746 | * Note: We currently don't support runtime services on an EFI | |
747 | * that doesn't match the kernel 32/64-bit mode. | |
748 | */ | |
749 | ||
5189c2a7 | 750 | if (!efi_is_native()) |
1adbfa35 | 751 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 752 | else { |
fb834c7a | 753 | if (disable_runtime || efi_runtime_init()) |
83e68189 | 754 | return; |
140bf275 | 755 | } |
83e68189 | 756 | if (efi_memmap_init()) |
140bf275 | 757 | return; |
83e68189 | 758 | |
3e909599 | 759 | set_bit(EFI_MEMMAP, &efi.flags); |
83e68189 | 760 | |
5b83683f | 761 | print_efi_memmap(); |
5b83683f HY |
762 | } |
763 | ||
2223af38 JT |
764 | void __init efi_late_init(void) |
765 | { | |
766 | efi_bgrt_init(); | |
767 | } | |
768 | ||
9cd2b07c MG |
769 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
770 | { | |
771 | u64 addr, npages; | |
772 | ||
773 | addr = md->virt_addr; | |
774 | npages = md->num_pages; | |
775 | ||
776 | memrange_efi_to_native(&addr, &npages); | |
777 | ||
778 | if (executable) | |
779 | set_memory_x(addr, npages); | |
780 | else | |
781 | set_memory_nx(addr, npages); | |
782 | } | |
783 | ||
c55d016f | 784 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
785 | { |
786 | efi_memory_desc_t *md; | |
a2172e25 HY |
787 | void *p; |
788 | ||
a2172e25 HY |
789 | /* Make EFI runtime service code area executable */ |
790 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
791 | md = p; | |
1c083eb2 HY |
792 | |
793 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
794 | continue; | |
795 | ||
9cd2b07c | 796 | efi_set_executable(md, true); |
a2172e25 | 797 | } |
a2172e25 | 798 | } |
a2172e25 | 799 | |
3e8fa263 MF |
800 | void efi_memory_uc(u64 addr, unsigned long size) |
801 | { | |
802 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
803 | u64 npages; | |
804 | ||
805 | npages = round_up(size, page_shift) / page_shift; | |
806 | memrange_efi_to_native(&addr, &npages); | |
807 | set_memory_uc(addr, npages); | |
808 | } | |
809 | ||
d2f7cbe7 BP |
810 | void __init old_map_region(efi_memory_desc_t *md) |
811 | { | |
812 | u64 start_pfn, end_pfn, end; | |
813 | unsigned long size; | |
814 | void *va; | |
815 | ||
816 | start_pfn = PFN_DOWN(md->phys_addr); | |
817 | size = md->num_pages << PAGE_SHIFT; | |
818 | end = md->phys_addr + size; | |
819 | end_pfn = PFN_UP(end); | |
820 | ||
821 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
822 | va = __va(md->phys_addr); | |
823 | ||
824 | if (!(md->attribute & EFI_MEMORY_WB)) | |
825 | efi_memory_uc((u64)(unsigned long)va, size); | |
826 | } else | |
827 | va = efi_ioremap(md->phys_addr, size, | |
828 | md->type, md->attribute); | |
829 | ||
830 | md->virt_addr = (u64) (unsigned long) va; | |
831 | if (!va) | |
832 | pr_err("ioremap of 0x%llX failed!\n", | |
833 | (unsigned long long)md->phys_addr); | |
834 | } | |
835 | ||
481f75c0 DY |
836 | /* Merge contiguous regions of the same type and attribute */ |
837 | static void __init efi_merge_regions(void) | |
5b83683f | 838 | { |
481f75c0 | 839 | void *p; |
202f9d0a | 840 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 841 | |
202f9d0a MG |
842 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
843 | u64 prev_size; | |
844 | md = p; | |
845 | ||
846 | if (!prev_md) { | |
847 | prev_md = md; | |
848 | continue; | |
849 | } | |
850 | ||
851 | if (prev_md->type != md->type || | |
852 | prev_md->attribute != md->attribute) { | |
853 | prev_md = md; | |
854 | continue; | |
855 | } | |
856 | ||
857 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
858 | ||
859 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
860 | prev_md->num_pages += md->num_pages; | |
861 | md->type = EFI_RESERVED_TYPE; | |
862 | md->attribute = 0; | |
863 | continue; | |
864 | } | |
865 | prev_md = md; | |
481f75c0 DY |
866 | } |
867 | } | |
868 | ||
869 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
870 | { | |
871 | unsigned long size; | |
872 | u64 end, systab; | |
d2f7cbe7 | 873 | |
481f75c0 DY |
874 | size = md->num_pages << EFI_PAGE_SHIFT; |
875 | end = md->phys_addr + size; | |
876 | systab = (u64)(unsigned long)efi_phys.systab; | |
877 | if (md->phys_addr <= systab && systab < end) { | |
878 | systab += md->virt_addr - md->phys_addr; | |
879 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 880 | } |
481f75c0 DY |
881 | } |
882 | ||
fabb37c7 | 883 | static void __init save_runtime_map(void) |
926172d4 | 884 | { |
fabb37c7 | 885 | #ifdef CONFIG_KEXEC |
926172d4 DY |
886 | efi_memory_desc_t *md; |
887 | void *tmp, *p, *q = NULL; | |
888 | int count = 0; | |
889 | ||
890 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
891 | md = p; | |
892 | ||
893 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || | |
894 | (md->type == EFI_BOOT_SERVICES_CODE) || | |
895 | (md->type == EFI_BOOT_SERVICES_DATA)) | |
896 | continue; | |
897 | tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL); | |
898 | if (!tmp) | |
899 | goto out; | |
900 | q = tmp; | |
901 | ||
902 | memcpy(q + count * memmap.desc_size, md, memmap.desc_size); | |
903 | count++; | |
904 | } | |
905 | ||
518548ab | 906 | efi_runtime_map_setup(q, count, memmap.desc_size); |
fabb37c7 | 907 | return; |
926172d4 | 908 | |
926172d4 DY |
909 | out: |
910 | kfree(q); | |
fabb37c7 BP |
911 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
912 | #endif | |
1fec0533 DY |
913 | } |
914 | ||
b7b898ae BP |
915 | static void *realloc_pages(void *old_memmap, int old_shift) |
916 | { | |
917 | void *ret; | |
918 | ||
919 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
920 | if (!ret) | |
921 | goto out; | |
922 | ||
923 | /* | |
924 | * A first-time allocation doesn't have anything to copy. | |
925 | */ | |
926 | if (!old_memmap) | |
927 | return ret; | |
928 | ||
929 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
930 | ||
931 | out: | |
932 | free_pages((unsigned long)old_memmap, old_shift); | |
933 | return ret; | |
934 | } | |
935 | ||
481f75c0 | 936 | /* |
b7b898ae BP |
937 | * Map the efi memory ranges of the runtime services and update new_mmap with |
938 | * virtual addresses. | |
481f75c0 | 939 | */ |
b7b898ae | 940 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 941 | { |
b7b898ae BP |
942 | void *p, *new_memmap = NULL; |
943 | unsigned long left = 0; | |
481f75c0 | 944 | efi_memory_desc_t *md; |
202f9d0a | 945 | |
5b83683f HY |
946 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
947 | md = p; | |
70087011 JB |
948 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
949 | #ifdef CONFIG_X86_64 | |
950 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
951 | md->type != EFI_BOOT_SERVICES_DATA) | |
952 | #endif | |
953 | continue; | |
954 | } | |
1c083eb2 | 955 | |
d2f7cbe7 | 956 | efi_map_region(md); |
481f75c0 DY |
957 | get_systab_virt_addr(md); |
958 | ||
b7b898ae BP |
959 | if (left < memmap.desc_size) { |
960 | new_memmap = realloc_pages(new_memmap, *pg_shift); | |
961 | if (!new_memmap) | |
962 | return NULL; | |
963 | ||
964 | left += PAGE_SIZE << *pg_shift; | |
965 | (*pg_shift)++; | |
966 | } | |
967 | ||
481f75c0 DY |
968 | memcpy(new_memmap + (*count * memmap.desc_size), md, |
969 | memmap.desc_size); | |
b7b898ae BP |
970 | |
971 | left -= memmap.desc_size; | |
481f75c0 DY |
972 | (*count)++; |
973 | } | |
d2f7cbe7 | 974 | |
481f75c0 | 975 | return new_memmap; |
481f75c0 DY |
976 | } |
977 | ||
fabb37c7 BP |
978 | static void __init kexec_enter_virtual_mode(void) |
979 | { | |
980 | #ifdef CONFIG_KEXEC | |
981 | efi_memory_desc_t *md; | |
982 | void *p; | |
983 | ||
984 | efi.systab = NULL; | |
985 | ||
986 | /* | |
987 | * We don't do virtual mode, since we don't do runtime services, on | |
988 | * non-native EFI | |
989 | */ | |
990 | if (!efi_is_native()) { | |
991 | efi_unmap_memmap(); | |
992 | return; | |
993 | } | |
994 | ||
995 | /* | |
996 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
997 | * fixed addr which was used in first kernel of a kexec boot. | |
998 | */ | |
999 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
1000 | md = p; | |
1001 | efi_map_region_fixed(md); /* FIXME: add error handling */ | |
1002 | get_systab_virt_addr(md); | |
1003 | } | |
1004 | ||
1005 | save_runtime_map(); | |
1006 | ||
1007 | BUG_ON(!efi.systab); | |
1008 | ||
1009 | efi_sync_low_kernel_mappings(); | |
1010 | ||
1011 | /* | |
1012 | * Now that EFI is in virtual mode, update the function | |
1013 | * pointers in the runtime service table to the new virtual addresses. | |
1014 | * | |
1015 | * Call EFI services through wrapper functions. | |
1016 | */ | |
1017 | efi.runtime_version = efi_systab.hdr.revision; | |
1018 | efi.get_time = virt_efi_get_time; | |
1019 | efi.set_time = virt_efi_set_time; | |
1020 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
1021 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
1022 | efi.get_variable = virt_efi_get_variable; | |
1023 | efi.get_next_variable = virt_efi_get_next_variable; | |
1024 | efi.set_variable = virt_efi_set_variable; | |
1025 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
1026 | efi.reset_system = virt_efi_reset_system; | |
1027 | efi.set_virtual_address_map = NULL; | |
1028 | efi.query_variable_info = virt_efi_query_variable_info; | |
1029 | efi.update_capsule = virt_efi_update_capsule; | |
1030 | efi.query_capsule_caps = virt_efi_query_capsule_caps; | |
1031 | ||
1032 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
1033 | runtime_code_page_mkexec(); | |
1034 | ||
1035 | /* clean DUMMY object */ | |
1036 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
1037 | EFI_VARIABLE_NON_VOLATILE | | |
1038 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
1039 | EFI_VARIABLE_RUNTIME_ACCESS, | |
1040 | 0, NULL); | |
1041 | #endif | |
1042 | } | |
1043 | ||
481f75c0 DY |
1044 | /* |
1045 | * This function will switch the EFI runtime services to virtual mode. | |
1046 | * Essentially, we look through the EFI memmap and map every region that | |
1047 | * has the runtime attribute bit set in its memory descriptor into the | |
1048 | * ->trampoline_pgd page table using a top-down VA allocation scheme. | |
1049 | * | |
1050 | * The old method which used to update that memory descriptor with the | |
1051 | * virtual address obtained from ioremap() is still supported when the | |
1052 | * kernel is booted with efi=old_map on its command line. Same old | |
1053 | * method enabled the runtime services to be called without having to | |
1054 | * thunk back into physical mode for every invocation. | |
1055 | * | |
1056 | * The new method does a pagetable switch in a preemption-safe manner | |
1057 | * so that we're in a different address space when calling a runtime | |
1058 | * function. For function arguments passing we do copy the PGDs of the | |
1059 | * kernel page table into ->trampoline_pgd prior to each call. | |
1fec0533 DY |
1060 | * |
1061 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
1062 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
1063 | * to the same virtual addresses as the first kernel, see |
1064 | * kexec_enter_virtual_mode(). | |
481f75c0 | 1065 | */ |
fabb37c7 | 1066 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 1067 | { |
fabb37c7 | 1068 | int count = 0, pg_shift = 0; |
481f75c0 | 1069 | void *new_memmap = NULL; |
b7b898ae | 1070 | efi_status_t status; |
1c083eb2 | 1071 | |
481f75c0 | 1072 | efi.systab = NULL; |
d2f7cbe7 | 1073 | |
481f75c0 DY |
1074 | /* |
1075 | * We don't do virtual mode, since we don't do runtime services, on | |
1076 | * non-native EFI | |
1077 | */ | |
1078 | if (!efi_is_native()) { | |
1079 | efi_unmap_memmap(); | |
1080 | return; | |
1081 | } | |
d2f7cbe7 | 1082 | |
fabb37c7 BP |
1083 | efi_merge_regions(); |
1084 | new_memmap = efi_map_regions(&count, &pg_shift); | |
1085 | if (!new_memmap) { | |
1086 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
1087 | return; | |
b7b898ae | 1088 | } |
926172d4 | 1089 | |
fabb37c7 BP |
1090 | save_runtime_map(); |
1091 | ||
5b83683f HY |
1092 | BUG_ON(!efi.systab); |
1093 | ||
fabb37c7 BP |
1094 | if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) |
1095 | return; | |
b7b898ae | 1096 | |
d2f7cbe7 | 1097 | efi_sync_low_kernel_mappings(); |
11cc8512 | 1098 | efi_dump_pagetable(); |
d2f7cbe7 | 1099 | |
fabb37c7 | 1100 | status = phys_efi_set_virtual_address_map( |
1fec0533 DY |
1101 | memmap.desc_size * count, |
1102 | memmap.desc_size, | |
1103 | memmap.desc_version, | |
1104 | (efi_memory_desc_t *)__pa(new_memmap)); | |
1105 | ||
fabb37c7 BP |
1106 | if (status != EFI_SUCCESS) { |
1107 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
1108 | status); | |
1109 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
1110 | } |
1111 | ||
1112 | /* | |
1113 | * Now that EFI is in virtual mode, update the function | |
1114 | * pointers in the runtime service table to the new virtual addresses. | |
1115 | * | |
1116 | * Call EFI services through wrapper functions. | |
1117 | */ | |
712ba9e9 | 1118 | efi.runtime_version = efi_systab.hdr.revision; |
5b83683f HY |
1119 | efi.get_time = virt_efi_get_time; |
1120 | efi.set_time = virt_efi_set_time; | |
1121 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
1122 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
1123 | efi.get_variable = virt_efi_get_variable; | |
1124 | efi.get_next_variable = virt_efi_get_next_variable; | |
1125 | efi.set_variable = virt_efi_set_variable; | |
1126 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
1127 | efi.reset_system = virt_efi_reset_system; | |
2b5e8ef3 | 1128 | efi.set_virtual_address_map = NULL; |
3b370237 MG |
1129 | efi.query_variable_info = virt_efi_query_variable_info; |
1130 | efi.update_capsule = virt_efi_update_capsule; | |
1131 | efi.query_capsule_caps = virt_efi_query_capsule_caps; | |
d2f7cbe7 | 1132 | |
c55d016f | 1133 | efi_runtime_mkexec(); |
1adbfa35 | 1134 | |
b7b898ae BP |
1135 | /* |
1136 | * We mapped the descriptor array into the EFI pagetable above but we're | |
1137 | * not unmapping it here. Here's why: | |
1138 | * | |
1139 | * We're copying select PGDs from the kernel page table to the EFI page | |
1140 | * table and when we do so and make changes to those PGDs like unmapping | |
1141 | * stuff from them, those changes appear in the kernel page table and we | |
1142 | * go boom. | |
1143 | * | |
1144 | * From setup_real_mode(): | |
1145 | * | |
1146 | * ... | |
1147 | * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd; | |
1148 | * | |
1149 | * In this particular case, our allocation is in PGD 0 of the EFI page | |
1150 | * table but we've copied that PGD from PGD[272] of the EFI page table: | |
1151 | * | |
1152 | * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272 | |
1153 | * | |
1154 | * where the direct memory mapping in kernel space is. | |
1155 | * | |
1156 | * new_memmap's VA comes from that direct mapping and thus clearing it, | |
1157 | * it would get cleared in the kernel page table too. | |
1158 | * | |
1159 | * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift); | |
1160 | */ | |
fabb37c7 | 1161 | free_pages((unsigned long)new_memmap, pg_shift); |
f8b84043 MG |
1162 | |
1163 | /* clean DUMMY object */ | |
1164 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
1165 | EFI_VARIABLE_NON_VOLATILE | | |
1166 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
1167 | EFI_VARIABLE_RUNTIME_ACCESS, | |
1168 | 0, NULL); | |
5b83683f HY |
1169 | } |
1170 | ||
fabb37c7 BP |
1171 | void __init efi_enter_virtual_mode(void) |
1172 | { | |
1173 | if (efi_setup) | |
1174 | kexec_enter_virtual_mode(); | |
1175 | else | |
1176 | __efi_enter_virtual_mode(); | |
1177 | } | |
1178 | ||
5b83683f HY |
1179 | /* |
1180 | * Convenience functions to obtain memory types and attributes | |
1181 | */ | |
1182 | u32 efi_mem_type(unsigned long phys_addr) | |
1183 | { | |
1184 | efi_memory_desc_t *md; | |
1185 | void *p; | |
1186 | ||
83e68189 MF |
1187 | if (!efi_enabled(EFI_MEMMAP)) |
1188 | return 0; | |
1189 | ||
5b83683f HY |
1190 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
1191 | md = p; | |
1192 | if ((md->phys_addr <= phys_addr) && | |
1193 | (phys_addr < (md->phys_addr + | |
1194 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
1195 | return md->type; | |
1196 | } | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | u64 efi_mem_attributes(unsigned long phys_addr) | |
1201 | { | |
1202 | efi_memory_desc_t *md; | |
1203 | void *p; | |
1204 | ||
1205 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
1206 | md = p; | |
1207 | if ((md->phys_addr <= phys_addr) && | |
1208 | (phys_addr < (md->phys_addr + | |
1209 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
1210 | return md->attribute; | |
1211 | } | |
1212 | return 0; | |
1213 | } | |
a6e4d5a0 MF |
1214 | |
1215 | /* | |
5db80c65 MX |
1216 | * Some firmware implementations refuse to boot if there's insufficient space |
1217 | * in the variable store. Ensure that we never use more than a safe limit. | |
a6e4d5a0 MF |
1218 | * |
1219 | * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable | |
1220 | * store. | |
1221 | */ | |
1222 | efi_status_t efi_query_variable_store(u32 attributes, unsigned long size) | |
1223 | { | |
1224 | efi_status_t status; | |
1225 | u64 storage_size, remaining_size, max_size; | |
1226 | ||
f8b84043 MG |
1227 | if (!(attributes & EFI_VARIABLE_NON_VOLATILE)) |
1228 | return 0; | |
1229 | ||
a6e4d5a0 MF |
1230 | status = efi.query_variable_info(attributes, &storage_size, |
1231 | &remaining_size, &max_size); | |
1232 | if (status != EFI_SUCCESS) | |
1233 | return status; | |
1234 | ||
31ff2f20 | 1235 | /* |
5db80c65 MX |
1236 | * We account for that by refusing the write if permitting it would |
1237 | * reduce the available space to under 5KB. This figure was provided by | |
1238 | * Samsung, so should be safe. | |
31ff2f20 | 1239 | */ |
f8b84043 MG |
1240 | if ((remaining_size - size < EFI_MIN_RESERVE) && |
1241 | !efi_no_storage_paranoia) { | |
1242 | ||
1243 | /* | |
1244 | * Triggering garbage collection may require that the firmware | |
1245 | * generate a real EFI_OUT_OF_RESOURCES error. We can force | |
1246 | * that by attempting to use more space than is available. | |
1247 | */ | |
1248 | unsigned long dummy_size = remaining_size + 1024; | |
b8cb62f8 BH |
1249 | void *dummy = kzalloc(dummy_size, GFP_ATOMIC); |
1250 | ||
1251 | if (!dummy) | |
1252 | return EFI_OUT_OF_RESOURCES; | |
f8b84043 MG |
1253 | |
1254 | status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
1255 | EFI_VARIABLE_NON_VOLATILE | | |
1256 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
1257 | EFI_VARIABLE_RUNTIME_ACCESS, | |
1258 | dummy_size, dummy); | |
1259 | ||
1260 | if (status == EFI_SUCCESS) { | |
1261 | /* | |
1262 | * This should have failed, so if it didn't make sure | |
1263 | * that we delete it... | |
1264 | */ | |
1265 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
1266 | EFI_VARIABLE_NON_VOLATILE | | |
1267 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
1268 | EFI_VARIABLE_RUNTIME_ACCESS, | |
1269 | 0, dummy); | |
1270 | } | |
7791c842 | 1271 | |
b8cb62f8 BH |
1272 | kfree(dummy); |
1273 | ||
f8b84043 MG |
1274 | /* |
1275 | * The runtime code may now have triggered a garbage collection | |
1276 | * run, so check the variable info again | |
1277 | */ | |
1278 | status = efi.query_variable_info(attributes, &storage_size, | |
1279 | &remaining_size, &max_size); | |
8c58bf3e | 1280 | |
f8b84043 MG |
1281 | if (status != EFI_SUCCESS) |
1282 | return status; | |
1283 | ||
1284 | /* | |
1285 | * There still isn't enough room, so return an error | |
1286 | */ | |
1287 | if (remaining_size - size < EFI_MIN_RESERVE) | |
1288 | return EFI_OUT_OF_RESOURCES; | |
1289 | } | |
a6e4d5a0 MF |
1290 | |
1291 | return EFI_SUCCESS; | |
1292 | } | |
3668011d | 1293 | EXPORT_SYMBOL_GPL(efi_query_variable_store); |
d2f7cbe7 BP |
1294 | |
1295 | static int __init parse_efi_cmdline(char *str) | |
1296 | { | |
1297 | if (*str == '=') | |
1298 | str++; | |
1299 | ||
1300 | if (!strncmp(str, "old_map", 7)) | |
0f8093a9 | 1301 | set_bit(EFI_OLD_MEMMAP, &efi.flags); |
d2f7cbe7 BP |
1302 | |
1303 | return 0; | |
1304 | } | |
1305 | early_param("efi", parse_efi_cmdline); | |
a5d90c92 BP |
1306 | |
1307 | void __init efi_apply_memmap_quirks(void) | |
1308 | { | |
1309 | /* | |
1310 | * Once setup is done earlier, unmap the EFI memory map on mismatched | |
1311 | * firmware/kernel architectures since there is no support for runtime | |
1312 | * services. | |
1313 | */ | |
1314 | if (!efi_is_native()) { | |
1315 | pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n"); | |
1316 | efi_unmap_memmap(); | |
1317 | } | |
1318 | ||
1319 | /* | |
1320 | * UV doesn't support the new EFI pagetable mapping yet. | |
1321 | */ | |
1322 | if (is_uv_system()) | |
4fd69331 | 1323 | set_bit(EFI_OLD_MEMMAP, &efi.flags); |
a5d90c92 | 1324 | } |