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Commit | Line | Data |
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26d7f65f MF |
1 | #define pr_fmt(fmt) "efi: " fmt |
2 | ||
eeb9db09 ST |
3 | #include <linux/init.h> |
4 | #include <linux/kernel.h> | |
5 | #include <linux/string.h> | |
6 | #include <linux/time.h> | |
7 | #include <linux/types.h> | |
8 | #include <linux/efi.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/memblock.h> | |
11 | #include <linux/bootmem.h> | |
44be28e9 | 12 | #include <linux/acpi.h> |
d394f2d9 | 13 | #include <linux/dmi.h> |
5520b7e7 IM |
14 | |
15 | #include <asm/e820/api.h> | |
eeb9db09 ST |
16 | #include <asm/efi.h> |
17 | #include <asm/uv/uv.h> | |
2959c95d | 18 | #include <asm/cpu_device_id.h> |
eeb9db09 ST |
19 | |
20 | #define EFI_MIN_RESERVE 5120 | |
21 | ||
22 | #define EFI_DUMMY_GUID \ | |
23 | EFI_GUID(0x4424ac57, 0xbe4b, 0x47dd, 0x9e, 0x97, 0xed, 0x50, 0xf0, 0x9f, 0x92, 0xa9) | |
24 | ||
2959c95d JK |
25 | #define QUARK_CSH_SIGNATURE 0x5f435348 /* _CSH */ |
26 | #define QUARK_SECURITY_HEADER_SIZE 0x400 | |
27 | ||
28 | /* | |
29 | * Header prepended to the standard EFI capsule on Quark systems the are based | |
30 | * on Intel firmware BSP. | |
31 | * @csh_signature: Unique identifier to sanity check signed module | |
32 | * presence ("_CSH"). | |
33 | * @version: Current version of CSH used. Should be one for Quark A0. | |
34 | * @modulesize: Size of the entire module including the module header | |
35 | * and payload. | |
36 | * @security_version_number_index: Index of SVN to use for validation of signed | |
37 | * module. | |
38 | * @security_version_number: Used to prevent against roll back of modules. | |
39 | * @rsvd_module_id: Currently unused for Clanton (Quark). | |
40 | * @rsvd_module_vendor: Vendor Identifier. For Intel products value is | |
41 | * 0x00008086. | |
42 | * @rsvd_date: BCD representation of build date as yyyymmdd, where | |
43 | * yyyy=4 digit year, mm=1-12, dd=1-31. | |
44 | * @headersize: Total length of the header including including any | |
45 | * padding optionally added by the signing tool. | |
46 | * @hash_algo: What Hash is used in the module signing. | |
47 | * @cryp_algo: What Crypto is used in the module signing. | |
48 | * @keysize: Total length of the key data including including any | |
49 | * padding optionally added by the signing tool. | |
50 | * @signaturesize: Total length of the signature including including any | |
51 | * padding optionally added by the signing tool. | |
52 | * @rsvd_next_header: 32-bit pointer to the next Secure Boot Module in the | |
53 | * chain, if there is a next header. | |
54 | * @rsvd: Reserved, padding structure to required size. | |
55 | * | |
56 | * See also QuartSecurityHeader_t in | |
57 | * Quark_EDKII_v1.2.1.1/QuarkPlatformPkg/Include/QuarkBootRom.h | |
58 | * from https://downloadcenter.intel.com/download/23197/Intel-Quark-SoC-X1000-Board-Support-Package-BSP | |
59 | */ | |
60 | struct quark_security_header { | |
61 | u32 csh_signature; | |
62 | u32 version; | |
63 | u32 modulesize; | |
64 | u32 security_version_number_index; | |
65 | u32 security_version_number; | |
66 | u32 rsvd_module_id; | |
67 | u32 rsvd_module_vendor; | |
68 | u32 rsvd_date; | |
69 | u32 headersize; | |
70 | u32 hash_algo; | |
71 | u32 cryp_algo; | |
72 | u32 keysize; | |
73 | u32 signaturesize; | |
74 | u32 rsvd_next_header; | |
75 | u32 rsvd[2]; | |
76 | }; | |
77 | ||
eeb9db09 ST |
78 | static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 }; |
79 | ||
80 | static bool efi_no_storage_paranoia; | |
81 | ||
82 | /* | |
83 | * Some firmware implementations refuse to boot if there's insufficient | |
84 | * space in the variable store. The implementation of garbage collection | |
85 | * in some FW versions causes stale (deleted) variables to take up space | |
86 | * longer than intended and space is only freed once the store becomes | |
87 | * almost completely full. | |
88 | * | |
89 | * Enabling this option disables the space checks in | |
90 | * efi_query_variable_store() and forces garbage collection. | |
91 | * | |
92 | * Only enable this option if deleting EFI variables does not free up | |
93 | * space in your variable store, e.g. if despite deleting variables | |
94 | * you're unable to create new ones. | |
95 | */ | |
96 | static int __init setup_storage_paranoia(char *arg) | |
97 | { | |
98 | efi_no_storage_paranoia = true; | |
99 | return 0; | |
100 | } | |
101 | early_param("efi_no_storage_paranoia", setup_storage_paranoia); | |
102 | ||
103 | /* | |
104 | * Deleting the dummy variable which kicks off garbage collection | |
105 | */ | |
106 | void efi_delete_dummy_variable(void) | |
107 | { | |
108 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
109 | EFI_VARIABLE_NON_VOLATILE | | |
110 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
111 | EFI_VARIABLE_RUNTIME_ACCESS, | |
112 | 0, NULL); | |
113 | } | |
114 | ||
ca0e30dc AB |
115 | /* |
116 | * In the nonblocking case we do not attempt to perform garbage | |
117 | * collection if we do not have enough free space. Rather, we do the | |
118 | * bare minimum check and give up immediately if the available space | |
119 | * is below EFI_MIN_RESERVE. | |
120 | * | |
121 | * This function is intended to be small and simple because it is | |
122 | * invoked from crash handler paths. | |
123 | */ | |
124 | static efi_status_t | |
125 | query_variable_store_nonblocking(u32 attributes, unsigned long size) | |
126 | { | |
127 | efi_status_t status; | |
128 | u64 storage_size, remaining_size, max_size; | |
129 | ||
130 | status = efi.query_variable_info_nonblocking(attributes, &storage_size, | |
131 | &remaining_size, | |
132 | &max_size); | |
133 | if (status != EFI_SUCCESS) | |
134 | return status; | |
135 | ||
136 | if (remaining_size - size < EFI_MIN_RESERVE) | |
137 | return EFI_OUT_OF_RESOURCES; | |
138 | ||
139 | return EFI_SUCCESS; | |
140 | } | |
141 | ||
eeb9db09 ST |
142 | /* |
143 | * Some firmware implementations refuse to boot if there's insufficient space | |
144 | * in the variable store. Ensure that we never use more than a safe limit. | |
145 | * | |
146 | * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable | |
147 | * store. | |
148 | */ | |
ca0e30dc AB |
149 | efi_status_t efi_query_variable_store(u32 attributes, unsigned long size, |
150 | bool nonblocking) | |
eeb9db09 ST |
151 | { |
152 | efi_status_t status; | |
153 | u64 storage_size, remaining_size, max_size; | |
154 | ||
155 | if (!(attributes & EFI_VARIABLE_NON_VOLATILE)) | |
156 | return 0; | |
157 | ||
ca0e30dc AB |
158 | if (nonblocking) |
159 | return query_variable_store_nonblocking(attributes, size); | |
160 | ||
eeb9db09 ST |
161 | status = efi.query_variable_info(attributes, &storage_size, |
162 | &remaining_size, &max_size); | |
163 | if (status != EFI_SUCCESS) | |
164 | return status; | |
165 | ||
166 | /* | |
167 | * We account for that by refusing the write if permitting it would | |
168 | * reduce the available space to under 5KB. This figure was provided by | |
169 | * Samsung, so should be safe. | |
170 | */ | |
171 | if ((remaining_size - size < EFI_MIN_RESERVE) && | |
172 | !efi_no_storage_paranoia) { | |
173 | ||
174 | /* | |
175 | * Triggering garbage collection may require that the firmware | |
176 | * generate a real EFI_OUT_OF_RESOURCES error. We can force | |
177 | * that by attempting to use more space than is available. | |
178 | */ | |
179 | unsigned long dummy_size = remaining_size + 1024; | |
180 | void *dummy = kzalloc(dummy_size, GFP_ATOMIC); | |
181 | ||
182 | if (!dummy) | |
183 | return EFI_OUT_OF_RESOURCES; | |
184 | ||
185 | status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
186 | EFI_VARIABLE_NON_VOLATILE | | |
187 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
188 | EFI_VARIABLE_RUNTIME_ACCESS, | |
189 | dummy_size, dummy); | |
190 | ||
191 | if (status == EFI_SUCCESS) { | |
192 | /* | |
193 | * This should have failed, so if it didn't make sure | |
194 | * that we delete it... | |
195 | */ | |
196 | efi_delete_dummy_variable(); | |
197 | } | |
198 | ||
199 | kfree(dummy); | |
200 | ||
201 | /* | |
202 | * The runtime code may now have triggered a garbage collection | |
203 | * run, so check the variable info again | |
204 | */ | |
205 | status = efi.query_variable_info(attributes, &storage_size, | |
206 | &remaining_size, &max_size); | |
207 | ||
208 | if (status != EFI_SUCCESS) | |
209 | return status; | |
210 | ||
211 | /* | |
212 | * There still isn't enough room, so return an error | |
213 | */ | |
214 | if (remaining_size - size < EFI_MIN_RESERVE) | |
215 | return EFI_OUT_OF_RESOURCES; | |
216 | } | |
217 | ||
218 | return EFI_SUCCESS; | |
219 | } | |
220 | EXPORT_SYMBOL_GPL(efi_query_variable_store); | |
221 | ||
816e7612 MF |
222 | /* |
223 | * The UEFI specification makes it clear that the operating system is | |
224 | * free to do whatever it wants with boot services code after | |
225 | * ExitBootServices() has been called. Ignoring this recommendation a | |
226 | * significant bunch of EFI implementations continue calling into boot | |
227 | * services code (SetVirtualAddressMap). In order to work around such | |
228 | * buggy implementations we reserve boot services region during EFI | |
229 | * init and make sure it stays executable. Then, after | |
230 | * SetVirtualAddressMap(), it is discarded. | |
231 | * | |
232 | * However, some boot services regions contain data that is required | |
233 | * by drivers, so we need to track which memory ranges can never be | |
234 | * freed. This is done by tagging those regions with the | |
235 | * EFI_MEMORY_RUNTIME attribute. | |
236 | * | |
237 | * Any driver that wants to mark a region as reserved must use | |
238 | * efi_mem_reserve() which will insert a new EFI memory descriptor | |
239 | * into efi.memmap (splitting existing regions if necessary) and tag | |
240 | * it with EFI_MEMORY_RUNTIME. | |
241 | */ | |
242 | void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size) | |
243 | { | |
244 | phys_addr_t new_phys, new_size; | |
245 | struct efi_mem_range mr; | |
246 | efi_memory_desc_t md; | |
247 | int num_entries; | |
248 | void *new; | |
249 | ||
250 | if (efi_mem_desc_lookup(addr, &md)) { | |
251 | pr_err("Failed to lookup EFI memory descriptor for %pa\n", &addr); | |
252 | return; | |
253 | } | |
254 | ||
255 | if (addr + size > md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT)) { | |
256 | pr_err("Region spans EFI memory descriptors, %pa\n", &addr); | |
257 | return; | |
258 | } | |
259 | ||
6f6266a5 OS |
260 | /* No need to reserve regions that will never be freed. */ |
261 | if (md.attribute & EFI_MEMORY_RUNTIME) | |
262 | return; | |
263 | ||
92dc3350 MF |
264 | size += addr % EFI_PAGE_SIZE; |
265 | size = round_up(size, EFI_PAGE_SIZE); | |
266 | addr = round_down(addr, EFI_PAGE_SIZE); | |
267 | ||
816e7612 | 268 | mr.range.start = addr; |
92dc3350 | 269 | mr.range.end = addr + size - 1; |
816e7612 MF |
270 | mr.attribute = md.attribute | EFI_MEMORY_RUNTIME; |
271 | ||
272 | num_entries = efi_memmap_split_count(&md, &mr.range); | |
273 | num_entries += efi.memmap.nr_map; | |
274 | ||
275 | new_size = efi.memmap.desc_size * num_entries; | |
276 | ||
20b1e22d | 277 | new_phys = efi_memmap_alloc(num_entries); |
816e7612 MF |
278 | if (!new_phys) { |
279 | pr_err("Could not allocate boot services memmap\n"); | |
280 | return; | |
281 | } | |
282 | ||
283 | new = early_memremap(new_phys, new_size); | |
284 | if (!new) { | |
285 | pr_err("Failed to map new boot services memmap\n"); | |
286 | return; | |
287 | } | |
288 | ||
289 | efi_memmap_insert(&efi.memmap, new, &mr); | |
290 | early_memunmap(new, new_size); | |
291 | ||
292 | efi_memmap_install(new_phys, num_entries); | |
293 | } | |
294 | ||
452308de MF |
295 | /* |
296 | * Helper function for efi_reserve_boot_services() to figure out if we | |
297 | * can free regions in efi_free_boot_services(). | |
298 | * | |
299 | * Use this function to ensure we do not free regions owned by somebody | |
300 | * else. We must only reserve (and then free) regions: | |
301 | * | |
302 | * - Not within any part of the kernel | |
09821ff1 | 303 | * - Not the BIOS reserved area (E820_TYPE_RESERVED, E820_TYPE_NVS, etc) |
452308de MF |
304 | */ |
305 | static bool can_free_region(u64 start, u64 size) | |
306 | { | |
307 | if (start + size > __pa_symbol(_text) && start <= __pa_symbol(_end)) | |
308 | return false; | |
309 | ||
09821ff1 | 310 | if (!e820__mapped_all(start, start+size, E820_TYPE_RAM)) |
452308de MF |
311 | return false; |
312 | ||
313 | return true; | |
314 | } | |
315 | ||
eeb9db09 ST |
316 | void __init efi_reserve_boot_services(void) |
317 | { | |
78ce248f | 318 | efi_memory_desc_t *md; |
eeb9db09 | 319 | |
78ce248f | 320 | for_each_efi_memory_desc(md) { |
eeb9db09 ST |
321 | u64 start = md->phys_addr; |
322 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
452308de | 323 | bool already_reserved; |
eeb9db09 ST |
324 | |
325 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
326 | md->type != EFI_BOOT_SERVICES_DATA) | |
327 | continue; | |
452308de MF |
328 | |
329 | already_reserved = memblock_is_region_reserved(start, size); | |
330 | ||
331 | /* | |
332 | * Because the following memblock_reserve() is paired | |
333 | * with free_bootmem_late() for this region in | |
334 | * efi_free_boot_services(), we must be extremely | |
335 | * careful not to reserve, and subsequently free, | |
336 | * critical regions of memory (like the kernel image) or | |
337 | * those regions that somebody else has already | |
338 | * reserved. | |
339 | * | |
340 | * A good example of a critical region that must not be | |
341 | * freed is page zero (first 4Kb of memory), which may | |
342 | * contain boot services code/data but is marked | |
09821ff1 | 343 | * E820_TYPE_RESERVED by trim_bios_range(). |
452308de MF |
344 | */ |
345 | if (!already_reserved) { | |
eeb9db09 | 346 | memblock_reserve(start, size); |
452308de MF |
347 | |
348 | /* | |
349 | * If we are the first to reserve the region, no | |
350 | * one else cares about it. We own it and can | |
351 | * free it later. | |
352 | */ | |
353 | if (can_free_region(start, size)) | |
354 | continue; | |
355 | } | |
356 | ||
357 | /* | |
358 | * We don't own the region. We must not free it. | |
359 | * | |
360 | * Setting this bit for a boot services region really | |
361 | * doesn't make sense as far as the firmware is | |
362 | * concerned, but it does provide us with a way to tag | |
363 | * those regions that must not be paired with | |
364 | * free_bootmem_late(). | |
365 | */ | |
366 | md->attribute |= EFI_MEMORY_RUNTIME; | |
eeb9db09 ST |
367 | } |
368 | } | |
369 | ||
370 | void __init efi_free_boot_services(void) | |
371 | { | |
816e7612 | 372 | phys_addr_t new_phys, new_size; |
78ce248f | 373 | efi_memory_desc_t *md; |
816e7612 MF |
374 | int num_entries = 0; |
375 | void *new, *new_md; | |
eeb9db09 | 376 | |
78ce248f | 377 | for_each_efi_memory_desc(md) { |
eeb9db09 ST |
378 | unsigned long long start = md->phys_addr; |
379 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
5bc653b7 | 380 | size_t rm_size; |
eeb9db09 ST |
381 | |
382 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
816e7612 MF |
383 | md->type != EFI_BOOT_SERVICES_DATA) { |
384 | num_entries++; | |
eeb9db09 | 385 | continue; |
816e7612 | 386 | } |
eeb9db09 | 387 | |
452308de | 388 | /* Do not free, someone else owns it: */ |
816e7612 MF |
389 | if (md->attribute & EFI_MEMORY_RUNTIME) { |
390 | num_entries++; | |
eeb9db09 | 391 | continue; |
816e7612 | 392 | } |
eeb9db09 | 393 | |
5bc653b7 AL |
394 | /* |
395 | * Nasty quirk: if all sub-1MB memory is used for boot | |
396 | * services, we can get here without having allocated the | |
397 | * real mode trampoline. It's too late to hand boot services | |
398 | * memory back to the memblock allocator, so instead | |
399 | * try to manually allocate the trampoline if needed. | |
400 | * | |
401 | * I've seen this on a Dell XPS 13 9350 with firmware | |
402 | * 1.4.4 with SGX enabled booting Linux via Fedora 24's | |
403 | * grub2-efi on a hard disk. (And no, I don't know why | |
404 | * this happened, but Linux should still try to boot rather | |
405 | * panicing early.) | |
406 | */ | |
407 | rm_size = real_mode_size_needed(); | |
408 | if (rm_size && (start + rm_size) < (1<<20) && size >= rm_size) { | |
409 | set_real_mode_mem(start, rm_size); | |
410 | start += rm_size; | |
411 | size -= rm_size; | |
412 | } | |
413 | ||
eeb9db09 ST |
414 | free_bootmem_late(start, size); |
415 | } | |
816e7612 | 416 | |
1ea34adb JG |
417 | if (!num_entries) |
418 | return; | |
419 | ||
816e7612 | 420 | new_size = efi.memmap.desc_size * num_entries; |
20b1e22d | 421 | new_phys = efi_memmap_alloc(num_entries); |
816e7612 MF |
422 | if (!new_phys) { |
423 | pr_err("Failed to allocate new EFI memmap\n"); | |
424 | return; | |
425 | } | |
426 | ||
427 | new = memremap(new_phys, new_size, MEMREMAP_WB); | |
428 | if (!new) { | |
429 | pr_err("Failed to map new EFI memmap\n"); | |
430 | return; | |
431 | } | |
432 | ||
433 | /* | |
434 | * Build a new EFI memmap that excludes any boot services | |
435 | * regions that are not tagged EFI_MEMORY_RUNTIME, since those | |
436 | * regions have now been freed. | |
437 | */ | |
438 | new_md = new; | |
439 | for_each_efi_memory_desc(md) { | |
440 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && | |
441 | (md->type == EFI_BOOT_SERVICES_CODE || | |
442 | md->type == EFI_BOOT_SERVICES_DATA)) | |
443 | continue; | |
444 | ||
445 | memcpy(new_md, md, efi.memmap.desc_size); | |
446 | new_md += efi.memmap.desc_size; | |
447 | } | |
448 | ||
449 | memunmap(new); | |
450 | ||
451 | if (efi_memmap_install(new_phys, num_entries)) { | |
452 | pr_err("Could not install new EFI memmap\n"); | |
453 | return; | |
454 | } | |
eeb9db09 ST |
455 | } |
456 | ||
457 | /* | |
458 | * A number of config table entries get remapped to virtual addresses | |
459 | * after entering EFI virtual mode. However, the kexec kernel requires | |
460 | * their physical addresses therefore we pass them via setup_data and | |
461 | * correct those entries to their respective physical addresses here. | |
462 | * | |
463 | * Currently only handles smbios which is necessary for some firmware | |
464 | * implementation. | |
465 | */ | |
466 | int __init efi_reuse_config(u64 tables, int nr_tables) | |
467 | { | |
468 | int i, sz, ret = 0; | |
469 | void *p, *tablep; | |
470 | struct efi_setup_data *data; | |
471 | ||
472 | if (!efi_setup) | |
473 | return 0; | |
474 | ||
475 | if (!efi_enabled(EFI_64BIT)) | |
476 | return 0; | |
477 | ||
478 | data = early_memremap(efi_setup, sizeof(*data)); | |
479 | if (!data) { | |
480 | ret = -ENOMEM; | |
481 | goto out; | |
482 | } | |
483 | ||
484 | if (!data->smbios) | |
485 | goto out_memremap; | |
486 | ||
487 | sz = sizeof(efi_config_table_64_t); | |
488 | ||
489 | p = tablep = early_memremap(tables, nr_tables * sz); | |
490 | if (!p) { | |
491 | pr_err("Could not map Configuration table!\n"); | |
492 | ret = -ENOMEM; | |
493 | goto out_memremap; | |
494 | } | |
495 | ||
496 | for (i = 0; i < efi.systab->nr_tables; i++) { | |
497 | efi_guid_t guid; | |
498 | ||
499 | guid = ((efi_config_table_64_t *)p)->guid; | |
500 | ||
501 | if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) | |
502 | ((efi_config_table_64_t *)p)->table = data->smbios; | |
503 | p += sz; | |
504 | } | |
98a716b6 | 505 | early_memunmap(tablep, nr_tables * sz); |
eeb9db09 ST |
506 | |
507 | out_memremap: | |
98a716b6 | 508 | early_memunmap(data, sizeof(*data)); |
eeb9db09 ST |
509 | out: |
510 | return ret; | |
511 | } | |
512 | ||
d394f2d9 AT |
513 | static const struct dmi_system_id sgi_uv1_dmi[] = { |
514 | { NULL, "SGI UV1", | |
515 | { DMI_MATCH(DMI_PRODUCT_NAME, "Stoutland Platform"), | |
516 | DMI_MATCH(DMI_PRODUCT_VERSION, "1.0"), | |
517 | DMI_MATCH(DMI_BIOS_VENDOR, "SGI.COM"), | |
518 | } | |
519 | }, | |
520 | { } /* NULL entry stops DMI scanning */ | |
521 | }; | |
522 | ||
eeb9db09 ST |
523 | void __init efi_apply_memmap_quirks(void) |
524 | { | |
525 | /* | |
526 | * Once setup is done earlier, unmap the EFI memory map on mismatched | |
527 | * firmware/kernel architectures since there is no support for runtime | |
528 | * services. | |
529 | */ | |
530 | if (!efi_runtime_supported()) { | |
26d7f65f | 531 | pr_info("Setup done, disabling due to 32/64-bit mismatch\n"); |
9479c7ce | 532 | efi_memmap_unmap(); |
eeb9db09 ST |
533 | } |
534 | ||
d394f2d9 AT |
535 | /* UV2+ BIOS has a fix for this issue. UV1 still needs the quirk. */ |
536 | if (dmi_check_system(sgi_uv1_dmi)) | |
eeb9db09 ST |
537 | set_bit(EFI_OLD_MEMMAP, &efi.flags); |
538 | } | |
44be28e9 MF |
539 | |
540 | /* | |
541 | * For most modern platforms the preferred method of powering off is via | |
542 | * ACPI. However, there are some that are known to require the use of | |
543 | * EFI runtime services and for which ACPI does not work at all. | |
544 | * | |
545 | * Using EFI is a last resort, to be used only if no other option | |
546 | * exists. | |
547 | */ | |
548 | bool efi_reboot_required(void) | |
549 | { | |
550 | if (!acpi_gbl_reduced_hardware) | |
551 | return false; | |
552 | ||
553 | efi_reboot_quirk_mode = EFI_RESET_WARM; | |
554 | return true; | |
555 | } | |
556 | ||
557 | bool efi_poweroff_required(void) | |
558 | { | |
13737181 | 559 | return acpi_gbl_reduced_hardware || acpi_no_s5; |
44be28e9 | 560 | } |
2959c95d JK |
561 | |
562 | #ifdef CONFIG_EFI_CAPSULE_QUIRK_QUARK_CSH | |
563 | ||
564 | static int qrk_capsule_setup_info(struct capsule_info *cap_info, void **pkbuff, | |
565 | size_t hdr_bytes) | |
566 | { | |
567 | struct quark_security_header *csh = *pkbuff; | |
568 | ||
569 | /* Only process data block that is larger than the security header */ | |
570 | if (hdr_bytes < sizeof(struct quark_security_header)) | |
571 | return 0; | |
572 | ||
573 | if (csh->csh_signature != QUARK_CSH_SIGNATURE || | |
574 | csh->headersize != QUARK_SECURITY_HEADER_SIZE) | |
575 | return 1; | |
576 | ||
577 | /* Only process data block if EFI header is included */ | |
578 | if (hdr_bytes < QUARK_SECURITY_HEADER_SIZE + | |
579 | sizeof(efi_capsule_header_t)) | |
580 | return 0; | |
581 | ||
582 | pr_debug("Quark security header detected\n"); | |
583 | ||
584 | if (csh->rsvd_next_header != 0) { | |
585 | pr_err("multiple Quark security headers not supported\n"); | |
586 | return -EINVAL; | |
587 | } | |
588 | ||
589 | *pkbuff += csh->headersize; | |
590 | cap_info->total_size = csh->headersize; | |
591 | ||
592 | /* | |
593 | * Update the first page pointer to skip over the CSH header. | |
594 | */ | |
20b16a3f AB |
595 | cap_info->phys[0] += csh->headersize; |
596 | ||
597 | /* | |
598 | * cap_info->capsule should point at a virtual mapping of the entire | |
599 | * capsule, starting at the capsule header. Our image has the Quark | |
600 | * security header prepended, so we cannot rely on the default vmap() | |
601 | * mapping created by the generic capsule code. | |
602 | * Given that the Quark firmware does not appear to care about the | |
603 | * virtual mapping, let's just point cap_info->capsule at our copy | |
604 | * of the capsule header. | |
605 | */ | |
606 | cap_info->capsule = &cap_info->header; | |
2959c95d JK |
607 | |
608 | return 1; | |
609 | } | |
610 | ||
611 | #define ICPU(family, model, quirk_handler) \ | |
612 | { X86_VENDOR_INTEL, family, model, X86_FEATURE_ANY, \ | |
613 | (unsigned long)&quirk_handler } | |
614 | ||
615 | static const struct x86_cpu_id efi_capsule_quirk_ids[] = { | |
616 | ICPU(5, 9, qrk_capsule_setup_info), /* Intel Quark X1000 */ | |
617 | { } | |
618 | }; | |
619 | ||
620 | int efi_capsule_setup_info(struct capsule_info *cap_info, void *kbuff, | |
621 | size_t hdr_bytes) | |
622 | { | |
623 | int (*quirk_handler)(struct capsule_info *, void **, size_t); | |
624 | const struct x86_cpu_id *id; | |
625 | int ret; | |
626 | ||
627 | if (hdr_bytes < sizeof(efi_capsule_header_t)) | |
628 | return 0; | |
629 | ||
630 | cap_info->total_size = 0; | |
631 | ||
632 | id = x86_match_cpu(efi_capsule_quirk_ids); | |
633 | if (id) { | |
634 | /* | |
635 | * The quirk handler is supposed to return | |
636 | * - a value > 0 if the setup should continue, after advancing | |
637 | * kbuff as needed | |
638 | * - 0 if not enough hdr_bytes are available yet | |
639 | * - a negative error code otherwise | |
640 | */ | |
641 | quirk_handler = (typeof(quirk_handler))id->driver_data; | |
642 | ret = quirk_handler(cap_info, &kbuff, hdr_bytes); | |
643 | if (ret <= 0) | |
644 | return ret; | |
645 | } | |
646 | ||
647 | memcpy(&cap_info->header, kbuff, sizeof(cap_info->header)); | |
648 | ||
649 | cap_info->total_size += cap_info->header.imagesize; | |
650 | ||
651 | return __efi_capsule_setup_info(cap_info); | |
652 | } | |
653 | ||
654 | #endif |