Commit | Line | Data |
---|---|---|
5b83683f HY |
1 | /* |
2 | * Common EFI (Extensible Firmware Interface) support functions | |
3 | * Based on Extensible Firmware Interface Specification version 1.0 | |
4 | * | |
5 | * Copyright (C) 1999 VA Linux Systems | |
6 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
7 | * Copyright (C) 1999-2002 Hewlett-Packard Co. | |
8 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
9 | * Stephane Eranian <eranian@hpl.hp.com> | |
10 | * Copyright (C) 2005-2008 Intel Co. | |
11 | * Fenghua Yu <fenghua.yu@intel.com> | |
12 | * Bibo Mao <bibo.mao@intel.com> | |
13 | * Chandramouli Narayanan <mouli@linux.intel.com> | |
14 | * Huang Ying <ying.huang@intel.com> | |
15 | * | |
16 | * Copied from efi_32.c to eliminate the duplicated code between EFI | |
17 | * 32/64 support code. --ying 2007-10-26 | |
18 | * | |
19 | * All EFI Runtime Services are not implemented yet as EFI only | |
20 | * supports physical mode addressing on SoftSDV. This is to be fixed | |
21 | * in a future version. --drummond 1999-07-20 | |
22 | * | |
23 | * Implemented EFI runtime services and virtual mode calls. --davidm | |
24 | * | |
25 | * Goutham Rao: <goutham.rao@intel.com> | |
26 | * Skip non-WB memory and ignore empty memory ranges. | |
27 | */ | |
28 | ||
e3cb3f5a OJ |
29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
30 | ||
5b83683f HY |
31 | #include <linux/kernel.h> |
32 | #include <linux/init.h> | |
33 | #include <linux/efi.h> | |
2223af38 | 34 | #include <linux/efi-bgrt.h> |
69c60c88 | 35 | #include <linux/export.h> |
5b83683f | 36 | #include <linux/bootmem.h> |
0d01ff25 | 37 | #include <linux/slab.h> |
a9ce6bc1 | 38 | #include <linux/memblock.h> |
5b83683f HY |
39 | #include <linux/spinlock.h> |
40 | #include <linux/uaccess.h> | |
41 | #include <linux/time.h> | |
42 | #include <linux/io.h> | |
43 | #include <linux/reboot.h> | |
44 | #include <linux/bcd.h> | |
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 | |
d80603c9 JB |
63 | struct efi __read_mostly efi = { |
64 | .mps = EFI_INVALID_TABLE_ADDR, | |
65 | .acpi = EFI_INVALID_TABLE_ADDR, | |
66 | .acpi20 = EFI_INVALID_TABLE_ADDR, | |
67 | .smbios = EFI_INVALID_TABLE_ADDR, | |
68 | .sal_systab = EFI_INVALID_TABLE_ADDR, | |
69 | .boot_info = EFI_INVALID_TABLE_ADDR, | |
70 | .hcdp = EFI_INVALID_TABLE_ADDR, | |
71 | .uga = EFI_INVALID_TABLE_ADDR, | |
72 | .uv_systab = EFI_INVALID_TABLE_ADDR, | |
73 | }; | |
5b83683f HY |
74 | EXPORT_SYMBOL(efi); |
75 | ||
76 | struct efi_memory_map memmap; | |
77 | ||
ecaea42e | 78 | static struct efi efi_phys __initdata; |
5b83683f HY |
79 | static efi_system_table_t efi_systab __initdata; |
80 | ||
83e68189 MF |
81 | unsigned long x86_efi_facility; |
82 | ||
83 | /* | |
84 | * Returns 1 if 'facility' is enabled, 0 otherwise. | |
85 | */ | |
86 | int efi_enabled(int facility) | |
87 | { | |
88 | return test_bit(facility, &x86_efi_facility) != 0; | |
5189c2a7 | 89 | } |
83e68189 | 90 | EXPORT_SYMBOL(efi_enabled); |
5189c2a7 | 91 | |
058e7b58 | 92 | static bool __initdata disable_runtime = false; |
8b2cb7a8 HY |
93 | static int __init setup_noefi(char *arg) |
94 | { | |
fb834c7a | 95 | disable_runtime = true; |
8b2cb7a8 HY |
96 | return 0; |
97 | } | |
98 | early_param("noefi", setup_noefi); | |
99 | ||
200001eb PJ |
100 | int add_efi_memmap; |
101 | EXPORT_SYMBOL(add_efi_memmap); | |
102 | ||
103 | static int __init setup_add_efi_memmap(char *arg) | |
104 | { | |
105 | add_efi_memmap = 1; | |
106 | return 0; | |
107 | } | |
108 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
109 | ||
8c58bf3e RW |
110 | static bool efi_no_storage_paranoia; |
111 | ||
112 | static int __init setup_storage_paranoia(char *arg) | |
113 | { | |
114 | efi_no_storage_paranoia = true; | |
115 | return 0; | |
116 | } | |
117 | early_param("efi_no_storage_paranoia", setup_storage_paranoia); | |
118 | ||
200001eb | 119 | |
5b83683f HY |
120 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
121 | { | |
ef68c8f8 JB |
122 | unsigned long flags; |
123 | efi_status_t status; | |
124 | ||
125 | spin_lock_irqsave(&rtc_lock, flags); | |
126 | status = efi_call_virt2(get_time, tm, tc); | |
127 | spin_unlock_irqrestore(&rtc_lock, flags); | |
128 | return status; | |
5b83683f HY |
129 | } |
130 | ||
131 | static efi_status_t virt_efi_set_time(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_virt1(set_time, tm); | |
138 | spin_unlock_irqrestore(&rtc_lock, flags); | |
139 | return status; | |
5b83683f HY |
140 | } |
141 | ||
142 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, | |
143 | efi_bool_t *pending, | |
144 | efi_time_t *tm) | |
145 | { | |
ef68c8f8 JB |
146 | unsigned long flags; |
147 | efi_status_t status; | |
148 | ||
149 | spin_lock_irqsave(&rtc_lock, flags); | |
150 | status = efi_call_virt3(get_wakeup_time, | |
151 | enabled, pending, tm); | |
152 | spin_unlock_irqrestore(&rtc_lock, flags); | |
153 | return status; | |
5b83683f HY |
154 | } |
155 | ||
156 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
157 | { | |
ef68c8f8 JB |
158 | unsigned long flags; |
159 | efi_status_t status; | |
160 | ||
161 | spin_lock_irqsave(&rtc_lock, flags); | |
162 | status = efi_call_virt2(set_wakeup_time, | |
163 | enabled, tm); | |
164 | spin_unlock_irqrestore(&rtc_lock, flags); | |
165 | return status; | |
5b83683f HY |
166 | } |
167 | ||
168 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, | |
169 | efi_guid_t *vendor, | |
170 | u32 *attr, | |
171 | unsigned long *data_size, | |
172 | void *data) | |
173 | { | |
174 | return efi_call_virt5(get_variable, | |
175 | name, vendor, attr, | |
176 | data_size, data); | |
177 | } | |
178 | ||
179 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, | |
180 | efi_char16_t *name, | |
181 | efi_guid_t *vendor) | |
182 | { | |
f8b84043 MG |
183 | return efi_call_virt3(get_next_variable, |
184 | name_size, name, vendor); | |
5b83683f HY |
185 | } |
186 | ||
187 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, | |
188 | efi_guid_t *vendor, | |
f7a2d73f | 189 | u32 attr, |
5b83683f HY |
190 | unsigned long data_size, |
191 | void *data) | |
192 | { | |
f8b84043 MG |
193 | return efi_call_virt5(set_variable, |
194 | name, vendor, attr, | |
195 | data_size, data); | |
5b83683f HY |
196 | } |
197 | ||
3b370237 MG |
198 | static efi_status_t virt_efi_query_variable_info(u32 attr, |
199 | u64 *storage_space, | |
200 | u64 *remaining_space, | |
201 | u64 *max_variable_size) | |
202 | { | |
203 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
204 | return EFI_UNSUPPORTED; | |
205 | ||
206 | return efi_call_virt4(query_variable_info, attr, storage_space, | |
207 | remaining_space, max_variable_size); | |
208 | } | |
209 | ||
5b83683f HY |
210 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) |
211 | { | |
212 | return efi_call_virt1(get_next_high_mono_count, count); | |
213 | } | |
214 | ||
215 | static void virt_efi_reset_system(int reset_type, | |
216 | efi_status_t status, | |
217 | unsigned long data_size, | |
218 | efi_char16_t *data) | |
219 | { | |
220 | efi_call_virt4(reset_system, reset_type, status, | |
221 | data_size, data); | |
222 | } | |
223 | ||
3b370237 MG |
224 | static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, |
225 | unsigned long count, | |
226 | unsigned long sg_list) | |
227 | { | |
228 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
229 | return EFI_UNSUPPORTED; | |
230 | ||
231 | return efi_call_virt3(update_capsule, capsules, count, sg_list); | |
232 | } | |
233 | ||
234 | static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, | |
235 | unsigned long count, | |
236 | u64 *max_size, | |
237 | int *reset_type) | |
238 | { | |
239 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
240 | return EFI_UNSUPPORTED; | |
241 | ||
242 | return efi_call_virt4(query_capsule_caps, capsules, count, max_size, | |
243 | reset_type); | |
244 | } | |
245 | ||
5b83683f HY |
246 | static efi_status_t __init phys_efi_set_virtual_address_map( |
247 | unsigned long memory_map_size, | |
248 | unsigned long descriptor_size, | |
249 | u32 descriptor_version, | |
250 | efi_memory_desc_t *virtual_map) | |
251 | { | |
252 | efi_status_t status; | |
253 | ||
254 | efi_call_phys_prelog(); | |
255 | status = efi_call_phys4(efi_phys.set_virtual_address_map, | |
256 | memory_map_size, descriptor_size, | |
257 | descriptor_version, virtual_map); | |
258 | efi_call_phys_epilog(); | |
259 | return status; | |
260 | } | |
261 | ||
11520e5e LT |
262 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, |
263 | efi_time_cap_t *tc) | |
264 | { | |
265 | unsigned long flags; | |
266 | efi_status_t status; | |
267 | ||
268 | spin_lock_irqsave(&rtc_lock, flags); | |
269 | efi_call_phys_prelog(); | |
270 | status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), | |
271 | virt_to_phys(tc)); | |
272 | efi_call_phys_epilog(); | |
273 | spin_unlock_irqrestore(&rtc_lock, flags); | |
274 | return status; | |
275 | } | |
276 | ||
3565184e | 277 | int efi_set_rtc_mmss(const struct timespec *now) |
5b83683f | 278 | { |
3565184e | 279 | unsigned long nowtime = now->tv_sec; |
5b83683f HY |
280 | efi_status_t status; |
281 | efi_time_t eft; | |
282 | efi_time_cap_t cap; | |
3195ef59 | 283 | struct rtc_time tm; |
5b83683f HY |
284 | |
285 | status = efi.get_time(&eft, &cap); | |
286 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 287 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
288 | return -1; |
289 | } | |
290 | ||
3195ef59 PB |
291 | rtc_time_to_tm(nowtime, &tm); |
292 | if (!rtc_valid_tm(&tm)) { | |
293 | eft.year = tm.tm_year + 1900; | |
294 | eft.month = tm.tm_mon + 1; | |
295 | eft.day = tm.tm_mday; | |
296 | eft.minute = tm.tm_min; | |
297 | eft.second = tm.tm_sec; | |
298 | eft.nanosecond = 0; | |
299 | } else { | |
300 | printk(KERN_ERR | |
301 | "%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n", | |
302 | __FUNCTION__, nowtime); | |
303 | return -1; | |
304 | } | |
5b83683f HY |
305 | |
306 | status = efi.set_time(&eft); | |
307 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 308 | pr_err("Oops: efitime: can't write time!\n"); |
5b83683f HY |
309 | return -1; |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
3565184e | 314 | void efi_get_time(struct timespec *now) |
5b83683f HY |
315 | { |
316 | efi_status_t status; | |
317 | efi_time_t eft; | |
318 | efi_time_cap_t cap; | |
319 | ||
320 | status = efi.get_time(&eft, &cap); | |
321 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 322 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f | 323 | |
3565184e DV |
324 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
325 | eft.minute, eft.second); | |
326 | now->tv_nsec = 0; | |
5b83683f HY |
327 | } |
328 | ||
69c91893 PJ |
329 | /* |
330 | * Tell the kernel about the EFI memory map. This might include | |
331 | * more than the max 128 entries that can fit in the e820 legacy | |
332 | * (zeropage) memory map. | |
333 | */ | |
334 | ||
200001eb | 335 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
336 | { |
337 | void *p; | |
338 | ||
339 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
340 | efi_memory_desc_t *md = p; | |
341 | unsigned long long start = md->phys_addr; | |
342 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
343 | int e820_type; | |
344 | ||
e2a71476 CW |
345 | switch (md->type) { |
346 | case EFI_LOADER_CODE: | |
347 | case EFI_LOADER_DATA: | |
348 | case EFI_BOOT_SERVICES_CODE: | |
349 | case EFI_BOOT_SERVICES_DATA: | |
350 | case EFI_CONVENTIONAL_MEMORY: | |
351 | if (md->attribute & EFI_MEMORY_WB) | |
352 | e820_type = E820_RAM; | |
353 | else | |
354 | e820_type = E820_RESERVED; | |
355 | break; | |
356 | case EFI_ACPI_RECLAIM_MEMORY: | |
357 | e820_type = E820_ACPI; | |
358 | break; | |
359 | case EFI_ACPI_MEMORY_NVS: | |
360 | e820_type = E820_NVS; | |
361 | break; | |
362 | case EFI_UNUSABLE_MEMORY: | |
363 | e820_type = E820_UNUSABLE; | |
364 | break; | |
365 | default: | |
366 | /* | |
367 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
368 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
369 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
370 | */ | |
69c91893 | 371 | e820_type = E820_RESERVED; |
e2a71476 CW |
372 | break; |
373 | } | |
d0be6bde | 374 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
375 | } |
376 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
377 | } | |
378 | ||
1adbfa35 | 379 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 380 | { |
15b9c359 | 381 | struct efi_info *e = &boot_params.efi_info; |
ecacf09f HY |
382 | unsigned long pmap; |
383 | ||
05486fa7 | 384 | #ifdef CONFIG_X86_32 |
1adbfa35 | 385 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 386 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
387 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
388 | return -EINVAL; | |
389 | } | |
15b9c359 | 390 | pmap = e->efi_memmap; |
05486fa7 | 391 | #else |
15b9c359 | 392 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 393 | #endif |
15b9c359 BP |
394 | memmap.phys_map = (void *)pmap; |
395 | memmap.nr_map = e->efi_memmap_size / | |
396 | e->efi_memdesc_size; | |
397 | memmap.desc_size = e->efi_memdesc_size; | |
398 | memmap.desc_version = e->efi_memdesc_version; | |
399 | ||
24aa0788 | 400 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 OJ |
401 | |
402 | return 0; | |
ecacf09f HY |
403 | } |
404 | ||
5b83683f HY |
405 | #if EFI_DEBUG |
406 | static void __init print_efi_memmap(void) | |
407 | { | |
408 | efi_memory_desc_t *md; | |
409 | void *p; | |
410 | int i; | |
411 | ||
412 | for (p = memmap.map, i = 0; | |
413 | p < memmap.map_end; | |
414 | p += memmap.desc_size, i++) { | |
415 | md = p; | |
e3cb3f5a | 416 | pr_info("mem%02u: type=%u, attr=0x%llx, " |
5b83683f HY |
417 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", |
418 | i, md->type, md->attribute, md->phys_addr, | |
419 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
420 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
421 | } | |
422 | } | |
423 | #endif /* EFI_DEBUG */ | |
424 | ||
916f676f MG |
425 | void __init efi_reserve_boot_services(void) |
426 | { | |
427 | void *p; | |
428 | ||
429 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
430 | efi_memory_desc_t *md = p; | |
7d68dc3f ML |
431 | u64 start = md->phys_addr; |
432 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
916f676f MG |
433 | |
434 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
435 | md->type != EFI_BOOT_SERVICES_DATA) | |
436 | continue; | |
7d68dc3f ML |
437 | /* Only reserve where possible: |
438 | * - Not within any already allocated areas | |
439 | * - Not over any memory area (really needed, if above?) | |
440 | * - Not within any part of the kernel | |
441 | * - Not the bios reserved area | |
442 | */ | |
fc8d7826 AD |
443 | if ((start+size >= __pa_symbol(_text) |
444 | && start <= __pa_symbol(_end)) || | |
7d68dc3f | 445 | !e820_all_mapped(start, start+size, E820_RAM) || |
bf61549a | 446 | memblock_is_region_reserved(start, size)) { |
7d68dc3f ML |
447 | /* Could not reserve, skip it */ |
448 | md->num_pages = 0; | |
e3cb3f5a | 449 | memblock_dbg("Could not reserve boot range " |
7d68dc3f ML |
450 | "[0x%010llx-0x%010llx]\n", |
451 | start, start+size-1); | |
452 | } else | |
24aa0788 | 453 | memblock_reserve(start, size); |
916f676f MG |
454 | } |
455 | } | |
456 | ||
5189c2a7 | 457 | void __init efi_unmap_memmap(void) |
78510792 | 458 | { |
83e68189 | 459 | clear_bit(EFI_MEMMAP, &x86_efi_facility); |
78510792 JT |
460 | if (memmap.map) { |
461 | early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); | |
462 | memmap.map = NULL; | |
463 | } | |
464 | } | |
465 | ||
466 | void __init efi_free_boot_services(void) | |
916f676f MG |
467 | { |
468 | void *p; | |
469 | ||
5189c2a7 | 470 | if (!efi_is_native()) |
78510792 JT |
471 | return; |
472 | ||
916f676f MG |
473 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
474 | efi_memory_desc_t *md = p; | |
475 | unsigned long long start = md->phys_addr; | |
476 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
477 | ||
478 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
479 | md->type != EFI_BOOT_SERVICES_DATA) | |
480 | continue; | |
481 | ||
7d68dc3f ML |
482 | /* Could not reserve boot area */ |
483 | if (!size) | |
484 | continue; | |
485 | ||
916f676f MG |
486 | free_bootmem_late(start, size); |
487 | } | |
78510792 JT |
488 | |
489 | efi_unmap_memmap(); | |
916f676f MG |
490 | } |
491 | ||
140bf275 | 492 | static int __init efi_systab_init(void *phys) |
5b83683f | 493 | { |
83e68189 | 494 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 OJ |
495 | efi_system_table_64_t *systab64; |
496 | u64 tmp = 0; | |
497 | ||
498 | systab64 = early_ioremap((unsigned long)phys, | |
499 | sizeof(*systab64)); | |
500 | if (systab64 == NULL) { | |
501 | pr_err("Couldn't map the system table!\n"); | |
502 | return -ENOMEM; | |
503 | } | |
504 | ||
505 | efi_systab.hdr = systab64->hdr; | |
506 | efi_systab.fw_vendor = systab64->fw_vendor; | |
507 | tmp |= systab64->fw_vendor; | |
508 | efi_systab.fw_revision = systab64->fw_revision; | |
509 | efi_systab.con_in_handle = systab64->con_in_handle; | |
510 | tmp |= systab64->con_in_handle; | |
511 | efi_systab.con_in = systab64->con_in; | |
512 | tmp |= systab64->con_in; | |
513 | efi_systab.con_out_handle = systab64->con_out_handle; | |
514 | tmp |= systab64->con_out_handle; | |
515 | efi_systab.con_out = systab64->con_out; | |
516 | tmp |= systab64->con_out; | |
517 | efi_systab.stderr_handle = systab64->stderr_handle; | |
518 | tmp |= systab64->stderr_handle; | |
519 | efi_systab.stderr = systab64->stderr; | |
520 | tmp |= systab64->stderr; | |
521 | efi_systab.runtime = (void *)(unsigned long)systab64->runtime; | |
522 | tmp |= systab64->runtime; | |
523 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; | |
524 | tmp |= systab64->boottime; | |
525 | efi_systab.nr_tables = systab64->nr_tables; | |
526 | efi_systab.tables = systab64->tables; | |
527 | tmp |= systab64->tables; | |
528 | ||
529 | early_iounmap(systab64, sizeof(*systab64)); | |
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) |
e3cb3f5a | 573 | pr_err("Warning: System table version " |
5b83683f HY |
574 | "%d.%02d, expected 1.00 or greater!\n", |
575 | efi.systab->hdr.revision >> 16, | |
576 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
577 | |
578 | return 0; | |
83e7ee66 | 579 | } |
5b83683f | 580 | |
140bf275 | 581 | static int __init efi_config_init(u64 tables, int nr_tables) |
83e7ee66 | 582 | { |
1adbfa35 OJ |
583 | void *config_tables, *tablep; |
584 | int i, sz; | |
585 | ||
83e68189 | 586 | if (efi_enabled(EFI_64BIT)) |
1adbfa35 OJ |
587 | sz = sizeof(efi_config_table_64_t); |
588 | else | |
589 | sz = sizeof(efi_config_table_32_t); | |
5b83683f HY |
590 | |
591 | /* | |
592 | * Let's see what config tables the firmware passed to us. | |
593 | */ | |
1adbfa35 | 594 | config_tables = early_ioremap(tables, nr_tables * sz); |
140bf275 | 595 | if (config_tables == NULL) { |
e3cb3f5a | 596 | pr_err("Could not map Configuration table!\n"); |
140bf275 OJ |
597 | return -ENOMEM; |
598 | } | |
5b83683f | 599 | |
1adbfa35 | 600 | tablep = config_tables; |
e3cb3f5a | 601 | pr_info(""); |
5b83683f | 602 | for (i = 0; i < efi.systab->nr_tables; i++) { |
1adbfa35 OJ |
603 | efi_guid_t guid; |
604 | unsigned long table; | |
605 | ||
83e68189 | 606 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 OJ |
607 | u64 table64; |
608 | guid = ((efi_config_table_64_t *)tablep)->guid; | |
609 | table64 = ((efi_config_table_64_t *)tablep)->table; | |
610 | table = table64; | |
611 | #ifdef CONFIG_X86_32 | |
612 | if (table64 >> 32) { | |
613 | pr_cont("\n"); | |
614 | pr_err("Table located above 4GB, disabling EFI.\n"); | |
615 | early_iounmap(config_tables, | |
616 | efi.systab->nr_tables * sz); | |
617 | return -EINVAL; | |
618 | } | |
619 | #endif | |
620 | } else { | |
621 | guid = ((efi_config_table_32_t *)tablep)->guid; | |
622 | table = ((efi_config_table_32_t *)tablep)->table; | |
623 | } | |
a6a46f41 OJ |
624 | if (!efi_guidcmp(guid, MPS_TABLE_GUID)) { |
625 | efi.mps = table; | |
626 | pr_cont(" MPS=0x%lx ", table); | |
627 | } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) { | |
628 | efi.acpi20 = table; | |
629 | pr_cont(" ACPI 2.0=0x%lx ", table); | |
630 | } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) { | |
631 | efi.acpi = table; | |
632 | pr_cont(" ACPI=0x%lx ", table); | |
633 | } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) { | |
634 | efi.smbios = table; | |
635 | pr_cont(" SMBIOS=0x%lx ", table); | |
03b48632 | 636 | #ifdef CONFIG_X86_UV |
a6a46f41 OJ |
637 | } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) { |
638 | efi.uv_systab = table; | |
639 | pr_cont(" UVsystab=0x%lx ", table); | |
03b48632 | 640 | #endif |
a6a46f41 OJ |
641 | } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) { |
642 | efi.hcdp = table; | |
643 | pr_cont(" HCDP=0x%lx ", table); | |
644 | } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) { | |
645 | efi.uga = table; | |
646 | pr_cont(" UGA=0x%lx ", table); | |
5b83683f | 647 | } |
1adbfa35 | 648 | tablep += sz; |
5b83683f | 649 | } |
e3cb3f5a | 650 | pr_cont("\n"); |
a6a46f41 | 651 | early_iounmap(config_tables, efi.systab->nr_tables * sz); |
140bf275 | 652 | return 0; |
83e7ee66 OJ |
653 | } |
654 | ||
140bf275 | 655 | static int __init efi_runtime_init(void) |
83e7ee66 OJ |
656 | { |
657 | efi_runtime_services_t *runtime; | |
5b83683f HY |
658 | |
659 | /* | |
660 | * Check out the runtime services table. We need to map | |
661 | * the runtime services table so that we can grab the physical | |
662 | * address of several of the EFI runtime functions, needed to | |
663 | * set the firmware into virtual mode. | |
664 | */ | |
beacfaac HY |
665 | runtime = early_ioremap((unsigned long)efi.systab->runtime, |
666 | sizeof(efi_runtime_services_t)); | |
140bf275 | 667 | if (!runtime) { |
e3cb3f5a | 668 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
669 | return -ENOMEM; |
670 | } | |
671 | /* | |
672 | * We will only need *early* access to the following | |
11520e5e | 673 | * two EFI runtime services before set_virtual_address_map |
140bf275 OJ |
674 | * is invoked. |
675 | */ | |
11520e5e | 676 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; |
140bf275 OJ |
677 | efi_phys.set_virtual_address_map = |
678 | (efi_set_virtual_address_map_t *) | |
679 | runtime->set_virtual_address_map; | |
11520e5e LT |
680 | /* |
681 | * Make efi_get_time can be called before entering | |
682 | * virtual mode. | |
683 | */ | |
684 | efi.get_time = phys_efi_get_time; | |
beacfaac | 685 | early_iounmap(runtime, sizeof(efi_runtime_services_t)); |
140bf275 OJ |
686 | |
687 | return 0; | |
83e7ee66 | 688 | } |
5b83683f | 689 | |
140bf275 | 690 | static int __init efi_memmap_init(void) |
83e7ee66 | 691 | { |
5b83683f | 692 | /* Map the EFI memory map */ |
beacfaac HY |
693 | memmap.map = early_ioremap((unsigned long)memmap.phys_map, |
694 | memmap.nr_map * memmap.desc_size); | |
140bf275 | 695 | if (memmap.map == NULL) { |
e3cb3f5a | 696 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
697 | return -ENOMEM; |
698 | } | |
5b83683f | 699 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 700 | |
200001eb PJ |
701 | if (add_efi_memmap) |
702 | do_add_efi_memmap(); | |
140bf275 OJ |
703 | |
704 | return 0; | |
83e7ee66 OJ |
705 | } |
706 | ||
707 | void __init efi_init(void) | |
708 | { | |
709 | efi_char16_t *c16; | |
710 | char vendor[100] = "unknown"; | |
711 | int i = 0; | |
712 | void *tmp; | |
713 | ||
714 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
715 | if (boot_params.efi_info.efi_systab_hi || |
716 | boot_params.efi_info.efi_memmap_hi) { | |
717 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
718 | return; |
719 | } | |
83e7ee66 OJ |
720 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
721 | #else | |
722 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
723 | (boot_params.efi_info.efi_systab | |
724 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
725 | #endif |
726 | ||
83e68189 | 727 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 728 | return; |
83e68189 MF |
729 | |
730 | set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility); | |
83e7ee66 OJ |
731 | |
732 | /* | |
733 | * Show what we know for posterity | |
734 | */ | |
735 | c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); | |
736 | if (c16) { | |
737 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
738 | vendor[i] = *c16++; | |
739 | vendor[i] = '\0'; | |
740 | } else | |
e3cb3f5a | 741 | pr_err("Could not map the firmware vendor!\n"); |
83e7ee66 OJ |
742 | early_iounmap(tmp, 2); |
743 | ||
e3cb3f5a OJ |
744 | pr_info("EFI v%u.%.02u by %s\n", |
745 | efi.systab->hdr.revision >> 16, | |
746 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 747 | |
83e68189 | 748 | if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) |
140bf275 | 749 | return; |
83e68189 MF |
750 | |
751 | set_bit(EFI_CONFIG_TABLES, &x86_efi_facility); | |
83e7ee66 | 752 | |
1adbfa35 OJ |
753 | /* |
754 | * Note: We currently don't support runtime services on an EFI | |
755 | * that doesn't match the kernel 32/64-bit mode. | |
756 | */ | |
757 | ||
5189c2a7 | 758 | if (!efi_is_native()) |
1adbfa35 | 759 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 760 | else { |
fb834c7a | 761 | if (disable_runtime || efi_runtime_init()) |
83e68189 MF |
762 | return; |
763 | set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility); | |
140bf275 | 764 | } |
83e7ee66 | 765 | |
83e68189 | 766 | if (efi_memmap_init()) |
140bf275 | 767 | return; |
83e68189 MF |
768 | |
769 | set_bit(EFI_MEMMAP, &x86_efi_facility); | |
770 | ||
11520e5e | 771 | #ifdef CONFIG_X86_32 |
5189c2a7 | 772 | if (efi_is_native()) { |
1adbfa35 OJ |
773 | x86_platform.get_wallclock = efi_get_time; |
774 | x86_platform.set_wallclock = efi_set_rtc_mmss; | |
775 | } | |
11520e5e | 776 | #endif |
7bd867df | 777 | |
5b83683f HY |
778 | #if EFI_DEBUG |
779 | print_efi_memmap(); | |
780 | #endif | |
781 | } | |
782 | ||
2223af38 JT |
783 | void __init efi_late_init(void) |
784 | { | |
785 | efi_bgrt_init(); | |
786 | } | |
787 | ||
9cd2b07c MG |
788 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
789 | { | |
790 | u64 addr, npages; | |
791 | ||
792 | addr = md->virt_addr; | |
793 | npages = md->num_pages; | |
794 | ||
795 | memrange_efi_to_native(&addr, &npages); | |
796 | ||
797 | if (executable) | |
798 | set_memory_x(addr, npages); | |
799 | else | |
800 | set_memory_nx(addr, npages); | |
801 | } | |
802 | ||
a2172e25 HY |
803 | static void __init runtime_code_page_mkexec(void) |
804 | { | |
805 | efi_memory_desc_t *md; | |
a2172e25 HY |
806 | void *p; |
807 | ||
a2172e25 HY |
808 | /* Make EFI runtime service code area executable */ |
809 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
810 | md = p; | |
1c083eb2 HY |
811 | |
812 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
813 | continue; | |
814 | ||
9cd2b07c | 815 | efi_set_executable(md, true); |
a2172e25 | 816 | } |
a2172e25 | 817 | } |
a2172e25 | 818 | |
7bc90e01 JT |
819 | /* |
820 | * We can't ioremap data in EFI boot services RAM, because we've already mapped | |
821 | * it as RAM. So, look it up in the existing EFI memory map instead. Only | |
822 | * callable after efi_enter_virtual_mode and before efi_free_boot_services. | |
823 | */ | |
824 | void __iomem *efi_lookup_mapped_addr(u64 phys_addr) | |
825 | { | |
826 | void *p; | |
827 | if (WARN_ON(!memmap.map)) | |
828 | return NULL; | |
829 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
830 | efi_memory_desc_t *md = p; | |
831 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
832 | u64 end = md->phys_addr + size; | |
833 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && | |
834 | md->type != EFI_BOOT_SERVICES_CODE && | |
835 | md->type != EFI_BOOT_SERVICES_DATA) | |
836 | continue; | |
837 | if (!md->virt_addr) | |
838 | continue; | |
839 | if (phys_addr >= md->phys_addr && phys_addr < end) { | |
840 | phys_addr += md->virt_addr - md->phys_addr; | |
841 | return (__force void __iomem *)(unsigned long)phys_addr; | |
842 | } | |
843 | } | |
844 | return NULL; | |
845 | } | |
846 | ||
3e8fa263 MF |
847 | void efi_memory_uc(u64 addr, unsigned long size) |
848 | { | |
849 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
850 | u64 npages; | |
851 | ||
852 | npages = round_up(size, page_shift) / page_shift; | |
853 | memrange_efi_to_native(&addr, &npages); | |
854 | set_memory_uc(addr, npages); | |
855 | } | |
856 | ||
5b83683f HY |
857 | /* |
858 | * This function will switch the EFI runtime services to virtual mode. | |
859 | * Essentially, look through the EFI memmap and map every region that | |
860 | * has the runtime attribute bit set in its memory descriptor and update | |
861 | * that memory descriptor with the virtual address obtained from ioremap(). | |
862 | * This enables the runtime services to be called without having to | |
863 | * thunk back into physical mode for every invocation. | |
864 | */ | |
865 | void __init efi_enter_virtual_mode(void) | |
866 | { | |
202f9d0a | 867 | efi_memory_desc_t *md, *prev_md = NULL; |
5b83683f | 868 | efi_status_t status; |
1c083eb2 | 869 | unsigned long size; |
dda56e13 | 870 | u64 end, systab, start_pfn, end_pfn; |
7cb00b72 MG |
871 | void *p, *va, *new_memmap = NULL; |
872 | int count = 0; | |
5b83683f HY |
873 | |
874 | efi.systab = NULL; | |
202f9d0a | 875 | |
1adbfa35 OJ |
876 | /* |
877 | * We don't do virtual mode, since we don't do runtime services, on | |
878 | * non-native EFI | |
879 | */ | |
880 | ||
5189c2a7 | 881 | if (!efi_is_native()) { |
78510792 JT |
882 | efi_unmap_memmap(); |
883 | return; | |
884 | } | |
1adbfa35 | 885 | |
202f9d0a MG |
886 | /* Merge contiguous regions of the same type and attribute */ |
887 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
888 | u64 prev_size; | |
889 | md = p; | |
890 | ||
891 | if (!prev_md) { | |
892 | prev_md = md; | |
893 | continue; | |
894 | } | |
895 | ||
896 | if (prev_md->type != md->type || | |
897 | prev_md->attribute != md->attribute) { | |
898 | prev_md = md; | |
899 | continue; | |
900 | } | |
901 | ||
902 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
903 | ||
904 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
905 | prev_md->num_pages += md->num_pages; | |
906 | md->type = EFI_RESERVED_TYPE; | |
907 | md->attribute = 0; | |
908 | continue; | |
909 | } | |
910 | prev_md = md; | |
911 | } | |
912 | ||
5b83683f HY |
913 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
914 | md = p; | |
70087011 JB |
915 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
916 | #ifdef CONFIG_X86_64 | |
917 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
918 | md->type != EFI_BOOT_SERVICES_DATA) | |
919 | #endif | |
920 | continue; | |
921 | } | |
1c083eb2 HY |
922 | |
923 | size = md->num_pages << EFI_PAGE_SHIFT; | |
924 | end = md->phys_addr + size; | |
925 | ||
dda56e13 | 926 | start_pfn = PFN_DOWN(md->phys_addr); |
dd39ecf5 | 927 | end_pfn = PFN_UP(end); |
dda56e13 | 928 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { |
1c083eb2 | 929 | va = __va(md->phys_addr); |
3e8fa263 MF |
930 | |
931 | if (!(md->attribute & EFI_MEMORY_WB)) | |
932 | efi_memory_uc((u64)(unsigned long)va, size); | |
933 | } else | |
934 | va = efi_ioremap(md->phys_addr, size, | |
935 | md->type, md->attribute); | |
1c083eb2 | 936 | |
1c083eb2 HY |
937 | md->virt_addr = (u64) (unsigned long) va; |
938 | ||
939 | if (!va) { | |
e3cb3f5a | 940 | pr_err("ioremap of 0x%llX failed!\n", |
5b83683f | 941 | (unsigned long long)md->phys_addr); |
1c083eb2 HY |
942 | continue; |
943 | } | |
944 | ||
945 | systab = (u64) (unsigned long) efi_phys.systab; | |
946 | if (md->phys_addr <= systab && systab < end) { | |
947 | systab += md->virt_addr - md->phys_addr; | |
948 | efi.systab = (efi_system_table_t *) (unsigned long) systab; | |
949 | } | |
7cb00b72 MG |
950 | new_memmap = krealloc(new_memmap, |
951 | (count + 1) * memmap.desc_size, | |
952 | GFP_KERNEL); | |
953 | memcpy(new_memmap + (count * memmap.desc_size), md, | |
954 | memmap.desc_size); | |
955 | count++; | |
5b83683f HY |
956 | } |
957 | ||
958 | BUG_ON(!efi.systab); | |
959 | ||
960 | status = phys_efi_set_virtual_address_map( | |
7cb00b72 | 961 | memmap.desc_size * count, |
5b83683f HY |
962 | memmap.desc_size, |
963 | memmap.desc_version, | |
7cb00b72 | 964 | (efi_memory_desc_t *)__pa(new_memmap)); |
5b83683f HY |
965 | |
966 | if (status != EFI_SUCCESS) { | |
e3cb3f5a OJ |
967 | pr_alert("Unable to switch EFI into virtual mode " |
968 | "(status=%lx)!\n", status); | |
5b83683f HY |
969 | panic("EFI call to SetVirtualAddressMap() failed!"); |
970 | } | |
971 | ||
972 | /* | |
973 | * Now that EFI is in virtual mode, update the function | |
974 | * pointers in the runtime service table to the new virtual addresses. | |
975 | * | |
976 | * Call EFI services through wrapper functions. | |
977 | */ | |
712ba9e9 | 978 | efi.runtime_version = efi_systab.hdr.revision; |
5b83683f HY |
979 | efi.get_time = virt_efi_get_time; |
980 | efi.set_time = virt_efi_set_time; | |
981 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
982 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
983 | efi.get_variable = virt_efi_get_variable; | |
984 | efi.get_next_variable = virt_efi_get_next_variable; | |
985 | efi.set_variable = virt_efi_set_variable; | |
986 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
987 | efi.reset_system = virt_efi_reset_system; | |
2b5e8ef3 | 988 | efi.set_virtual_address_map = NULL; |
3b370237 MG |
989 | efi.query_variable_info = virt_efi_query_variable_info; |
990 | efi.update_capsule = virt_efi_update_capsule; | |
991 | efi.query_capsule_caps = virt_efi_query_capsule_caps; | |
4de0d4a6 HY |
992 | if (__supported_pte_mask & _PAGE_NX) |
993 | runtime_code_page_mkexec(); | |
1adbfa35 | 994 | |
7cb00b72 | 995 | kfree(new_memmap); |
f8b84043 MG |
996 | |
997 | /* clean DUMMY object */ | |
998 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
999 | EFI_VARIABLE_NON_VOLATILE | | |
1000 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
1001 | EFI_VARIABLE_RUNTIME_ACCESS, | |
1002 | 0, NULL); | |
5b83683f HY |
1003 | } |
1004 | ||
1005 | /* | |
1006 | * Convenience functions to obtain memory types and attributes | |
1007 | */ | |
1008 | u32 efi_mem_type(unsigned long phys_addr) | |
1009 | { | |
1010 | efi_memory_desc_t *md; | |
1011 | void *p; | |
1012 | ||
83e68189 MF |
1013 | if (!efi_enabled(EFI_MEMMAP)) |
1014 | return 0; | |
1015 | ||
5b83683f HY |
1016 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
1017 | md = p; | |
1018 | if ((md->phys_addr <= phys_addr) && | |
1019 | (phys_addr < (md->phys_addr + | |
1020 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
1021 | return md->type; | |
1022 | } | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | u64 efi_mem_attributes(unsigned long phys_addr) | |
1027 | { | |
1028 | efi_memory_desc_t *md; | |
1029 | void *p; | |
1030 | ||
1031 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
1032 | md = p; | |
1033 | if ((md->phys_addr <= phys_addr) && | |
1034 | (phys_addr < (md->phys_addr + | |
1035 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
1036 | return md->attribute; | |
1037 | } | |
1038 | return 0; | |
1039 | } | |
a6e4d5a0 MF |
1040 | |
1041 | /* | |
1042 | * Some firmware has serious problems when using more than 50% of the EFI | |
1043 | * variable store, i.e. it triggers bugs that can brick machines. Ensure that | |
1044 | * we never use more than this safe limit. | |
1045 | * | |
1046 | * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable | |
1047 | * store. | |
1048 | */ | |
1049 | efi_status_t efi_query_variable_store(u32 attributes, unsigned long size) | |
1050 | { | |
1051 | efi_status_t status; | |
1052 | u64 storage_size, remaining_size, max_size; | |
1053 | ||
f8b84043 MG |
1054 | if (!(attributes & EFI_VARIABLE_NON_VOLATILE)) |
1055 | return 0; | |
1056 | ||
a6e4d5a0 MF |
1057 | status = efi.query_variable_info(attributes, &storage_size, |
1058 | &remaining_size, &max_size); | |
1059 | if (status != EFI_SUCCESS) | |
1060 | return status; | |
1061 | ||
31ff2f20 MG |
1062 | /* |
1063 | * Some firmware implementations refuse to boot if there's insufficient | |
1064 | * space in the variable store. We account for that by refusing the | |
1065 | * write if permitting it would reduce the available space to under | |
f8b84043 | 1066 | * 5KB. This figure was provided by Samsung, so should be safe. |
31ff2f20 | 1067 | */ |
f8b84043 MG |
1068 | if ((remaining_size - size < EFI_MIN_RESERVE) && |
1069 | !efi_no_storage_paranoia) { | |
1070 | ||
1071 | /* | |
1072 | * Triggering garbage collection may require that the firmware | |
1073 | * generate a real EFI_OUT_OF_RESOURCES error. We can force | |
1074 | * that by attempting to use more space than is available. | |
1075 | */ | |
1076 | unsigned long dummy_size = remaining_size + 1024; | |
b8cb62f8 BH |
1077 | void *dummy = kzalloc(dummy_size, GFP_ATOMIC); |
1078 | ||
1079 | if (!dummy) | |
1080 | return EFI_OUT_OF_RESOURCES; | |
f8b84043 MG |
1081 | |
1082 | status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
1083 | EFI_VARIABLE_NON_VOLATILE | | |
1084 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
1085 | EFI_VARIABLE_RUNTIME_ACCESS, | |
1086 | dummy_size, dummy); | |
1087 | ||
1088 | if (status == EFI_SUCCESS) { | |
1089 | /* | |
1090 | * This should have failed, so if it didn't make sure | |
1091 | * that we delete it... | |
1092 | */ | |
1093 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, | |
1094 | EFI_VARIABLE_NON_VOLATILE | | |
1095 | EFI_VARIABLE_BOOTSERVICE_ACCESS | | |
1096 | EFI_VARIABLE_RUNTIME_ACCESS, | |
1097 | 0, dummy); | |
1098 | } | |
7791c842 | 1099 | |
b8cb62f8 BH |
1100 | kfree(dummy); |
1101 | ||
f8b84043 MG |
1102 | /* |
1103 | * The runtime code may now have triggered a garbage collection | |
1104 | * run, so check the variable info again | |
1105 | */ | |
1106 | status = efi.query_variable_info(attributes, &storage_size, | |
1107 | &remaining_size, &max_size); | |
8c58bf3e | 1108 | |
f8b84043 MG |
1109 | if (status != EFI_SUCCESS) |
1110 | return status; | |
1111 | ||
1112 | /* | |
1113 | * There still isn't enough room, so return an error | |
1114 | */ | |
1115 | if (remaining_size - size < EFI_MIN_RESERVE) | |
1116 | return EFI_OUT_OF_RESOURCES; | |
1117 | } | |
a6e4d5a0 MF |
1118 | |
1119 | return EFI_SUCCESS; | |
1120 | } | |
3668011d | 1121 | EXPORT_SYMBOL_GPL(efi_query_variable_store); |