]>
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> | |
69c60c88 | 34 | #include <linux/export.h> |
5b83683f | 35 | #include <linux/bootmem.h> |
a9ce6bc1 | 36 | #include <linux/memblock.h> |
5b83683f HY |
37 | #include <linux/spinlock.h> |
38 | #include <linux/uaccess.h> | |
39 | #include <linux/time.h> | |
40 | #include <linux/io.h> | |
41 | #include <linux/reboot.h> | |
42 | #include <linux/bcd.h> | |
43 | ||
44 | #include <asm/setup.h> | |
45 | #include <asm/efi.h> | |
46 | #include <asm/time.h> | |
a2172e25 HY |
47 | #include <asm/cacheflush.h> |
48 | #include <asm/tlbflush.h> | |
7bd867df | 49 | #include <asm/x86_init.h> |
5b83683f HY |
50 | |
51 | #define EFI_DEBUG 1 | |
5b83683f HY |
52 | |
53 | int efi_enabled; | |
54 | EXPORT_SYMBOL(efi_enabled); | |
55 | ||
d80603c9 JB |
56 | struct efi __read_mostly efi = { |
57 | .mps = EFI_INVALID_TABLE_ADDR, | |
58 | .acpi = EFI_INVALID_TABLE_ADDR, | |
59 | .acpi20 = EFI_INVALID_TABLE_ADDR, | |
60 | .smbios = EFI_INVALID_TABLE_ADDR, | |
61 | .sal_systab = EFI_INVALID_TABLE_ADDR, | |
62 | .boot_info = EFI_INVALID_TABLE_ADDR, | |
63 | .hcdp = EFI_INVALID_TABLE_ADDR, | |
64 | .uga = EFI_INVALID_TABLE_ADDR, | |
65 | .uv_systab = EFI_INVALID_TABLE_ADDR, | |
66 | }; | |
5b83683f HY |
67 | EXPORT_SYMBOL(efi); |
68 | ||
69 | struct efi_memory_map memmap; | |
70 | ||
ecaea42e | 71 | static struct efi efi_phys __initdata; |
5b83683f HY |
72 | static efi_system_table_t efi_systab __initdata; |
73 | ||
8b2cb7a8 HY |
74 | static int __init setup_noefi(char *arg) |
75 | { | |
76 | efi_enabled = 0; | |
77 | return 0; | |
78 | } | |
79 | early_param("noefi", setup_noefi); | |
80 | ||
200001eb PJ |
81 | int add_efi_memmap; |
82 | EXPORT_SYMBOL(add_efi_memmap); | |
83 | ||
84 | static int __init setup_add_efi_memmap(char *arg) | |
85 | { | |
86 | add_efi_memmap = 1; | |
87 | return 0; | |
88 | } | |
89 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
90 | ||
91 | ||
5b83683f HY |
92 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
93 | { | |
ef68c8f8 JB |
94 | unsigned long flags; |
95 | efi_status_t status; | |
96 | ||
97 | spin_lock_irqsave(&rtc_lock, flags); | |
98 | status = efi_call_virt2(get_time, tm, tc); | |
99 | spin_unlock_irqrestore(&rtc_lock, flags); | |
100 | return status; | |
5b83683f HY |
101 | } |
102 | ||
103 | static efi_status_t virt_efi_set_time(efi_time_t *tm) | |
104 | { | |
ef68c8f8 JB |
105 | unsigned long flags; |
106 | efi_status_t status; | |
107 | ||
108 | spin_lock_irqsave(&rtc_lock, flags); | |
109 | status = efi_call_virt1(set_time, tm); | |
110 | spin_unlock_irqrestore(&rtc_lock, flags); | |
111 | return status; | |
5b83683f HY |
112 | } |
113 | ||
114 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, | |
115 | efi_bool_t *pending, | |
116 | efi_time_t *tm) | |
117 | { | |
ef68c8f8 JB |
118 | unsigned long flags; |
119 | efi_status_t status; | |
120 | ||
121 | spin_lock_irqsave(&rtc_lock, flags); | |
122 | status = efi_call_virt3(get_wakeup_time, | |
123 | enabled, pending, tm); | |
124 | spin_unlock_irqrestore(&rtc_lock, flags); | |
125 | return status; | |
5b83683f HY |
126 | } |
127 | ||
128 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
129 | { | |
ef68c8f8 JB |
130 | unsigned long flags; |
131 | efi_status_t status; | |
132 | ||
133 | spin_lock_irqsave(&rtc_lock, flags); | |
134 | status = efi_call_virt2(set_wakeup_time, | |
135 | enabled, tm); | |
136 | spin_unlock_irqrestore(&rtc_lock, flags); | |
137 | return status; | |
5b83683f HY |
138 | } |
139 | ||
140 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, | |
141 | efi_guid_t *vendor, | |
142 | u32 *attr, | |
143 | unsigned long *data_size, | |
144 | void *data) | |
145 | { | |
146 | return efi_call_virt5(get_variable, | |
147 | name, vendor, attr, | |
148 | data_size, data); | |
149 | } | |
150 | ||
151 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, | |
152 | efi_char16_t *name, | |
153 | efi_guid_t *vendor) | |
154 | { | |
155 | return efi_call_virt3(get_next_variable, | |
156 | name_size, name, vendor); | |
157 | } | |
158 | ||
159 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, | |
160 | efi_guid_t *vendor, | |
f7a2d73f | 161 | u32 attr, |
5b83683f HY |
162 | unsigned long data_size, |
163 | void *data) | |
164 | { | |
165 | return efi_call_virt5(set_variable, | |
166 | name, vendor, attr, | |
167 | data_size, data); | |
168 | } | |
169 | ||
3b370237 MG |
170 | static efi_status_t virt_efi_query_variable_info(u32 attr, |
171 | u64 *storage_space, | |
172 | u64 *remaining_space, | |
173 | u64 *max_variable_size) | |
174 | { | |
175 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
176 | return EFI_UNSUPPORTED; | |
177 | ||
178 | return efi_call_virt4(query_variable_info, attr, storage_space, | |
179 | remaining_space, max_variable_size); | |
180 | } | |
181 | ||
5b83683f HY |
182 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) |
183 | { | |
184 | return efi_call_virt1(get_next_high_mono_count, count); | |
185 | } | |
186 | ||
187 | static void virt_efi_reset_system(int reset_type, | |
188 | efi_status_t status, | |
189 | unsigned long data_size, | |
190 | efi_char16_t *data) | |
191 | { | |
192 | efi_call_virt4(reset_system, reset_type, status, | |
193 | data_size, data); | |
194 | } | |
195 | ||
3b370237 MG |
196 | static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, |
197 | unsigned long count, | |
198 | unsigned long sg_list) | |
199 | { | |
200 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
201 | return EFI_UNSUPPORTED; | |
202 | ||
203 | return efi_call_virt3(update_capsule, capsules, count, sg_list); | |
204 | } | |
205 | ||
206 | static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, | |
207 | unsigned long count, | |
208 | u64 *max_size, | |
209 | int *reset_type) | |
210 | { | |
211 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
212 | return EFI_UNSUPPORTED; | |
213 | ||
214 | return efi_call_virt4(query_capsule_caps, capsules, count, max_size, | |
215 | reset_type); | |
216 | } | |
217 | ||
5b83683f HY |
218 | static efi_status_t __init phys_efi_set_virtual_address_map( |
219 | unsigned long memory_map_size, | |
220 | unsigned long descriptor_size, | |
221 | u32 descriptor_version, | |
222 | efi_memory_desc_t *virtual_map) | |
223 | { | |
224 | efi_status_t status; | |
225 | ||
226 | efi_call_phys_prelog(); | |
227 | status = efi_call_phys4(efi_phys.set_virtual_address_map, | |
228 | memory_map_size, descriptor_size, | |
229 | descriptor_version, virtual_map); | |
230 | efi_call_phys_epilog(); | |
231 | return status; | |
232 | } | |
233 | ||
234 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, | |
235 | efi_time_cap_t *tc) | |
236 | { | |
ef68c8f8 | 237 | unsigned long flags; |
5b83683f HY |
238 | efi_status_t status; |
239 | ||
ef68c8f8 | 240 | spin_lock_irqsave(&rtc_lock, flags); |
5b83683f | 241 | efi_call_phys_prelog(); |
e9a9eca5 MM |
242 | status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), |
243 | virt_to_phys(tc)); | |
5b83683f | 244 | efi_call_phys_epilog(); |
ef68c8f8 | 245 | spin_unlock_irqrestore(&rtc_lock, flags); |
5b83683f HY |
246 | return status; |
247 | } | |
248 | ||
249 | int efi_set_rtc_mmss(unsigned long nowtime) | |
250 | { | |
251 | int real_seconds, real_minutes; | |
252 | efi_status_t status; | |
253 | efi_time_t eft; | |
254 | efi_time_cap_t cap; | |
255 | ||
256 | status = efi.get_time(&eft, &cap); | |
257 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 258 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
259 | return -1; |
260 | } | |
261 | ||
262 | real_seconds = nowtime % 60; | |
263 | real_minutes = nowtime / 60; | |
264 | if (((abs(real_minutes - eft.minute) + 15)/30) & 1) | |
265 | real_minutes += 30; | |
266 | real_minutes %= 60; | |
267 | eft.minute = real_minutes; | |
268 | eft.second = real_seconds; | |
269 | ||
270 | status = efi.set_time(&eft); | |
271 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 272 | pr_err("Oops: efitime: can't write time!\n"); |
5b83683f HY |
273 | return -1; |
274 | } | |
275 | return 0; | |
276 | } | |
277 | ||
278 | unsigned long efi_get_time(void) | |
279 | { | |
280 | efi_status_t status; | |
281 | efi_time_t eft; | |
282 | efi_time_cap_t cap; | |
283 | ||
284 | status = efi.get_time(&eft, &cap); | |
285 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 286 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
287 | |
288 | return mktime(eft.year, eft.month, eft.day, eft.hour, | |
289 | eft.minute, eft.second); | |
290 | } | |
291 | ||
69c91893 PJ |
292 | /* |
293 | * Tell the kernel about the EFI memory map. This might include | |
294 | * more than the max 128 entries that can fit in the e820 legacy | |
295 | * (zeropage) memory map. | |
296 | */ | |
297 | ||
200001eb | 298 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
299 | { |
300 | void *p; | |
301 | ||
302 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
303 | efi_memory_desc_t *md = p; | |
304 | unsigned long long start = md->phys_addr; | |
305 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
306 | int e820_type; | |
307 | ||
e2a71476 CW |
308 | switch (md->type) { |
309 | case EFI_LOADER_CODE: | |
310 | case EFI_LOADER_DATA: | |
311 | case EFI_BOOT_SERVICES_CODE: | |
312 | case EFI_BOOT_SERVICES_DATA: | |
313 | case EFI_CONVENTIONAL_MEMORY: | |
314 | if (md->attribute & EFI_MEMORY_WB) | |
315 | e820_type = E820_RAM; | |
316 | else | |
317 | e820_type = E820_RESERVED; | |
318 | break; | |
319 | case EFI_ACPI_RECLAIM_MEMORY: | |
320 | e820_type = E820_ACPI; | |
321 | break; | |
322 | case EFI_ACPI_MEMORY_NVS: | |
323 | e820_type = E820_NVS; | |
324 | break; | |
325 | case EFI_UNUSABLE_MEMORY: | |
326 | e820_type = E820_UNUSABLE; | |
327 | break; | |
328 | default: | |
329 | /* | |
330 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
331 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
332 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
333 | */ | |
69c91893 | 334 | e820_type = E820_RESERVED; |
e2a71476 CW |
335 | break; |
336 | } | |
d0be6bde | 337 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
338 | } |
339 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
340 | } | |
341 | ||
a9ce6bc1 | 342 | void __init efi_memblock_x86_reserve_range(void) |
ecacf09f HY |
343 | { |
344 | unsigned long pmap; | |
345 | ||
05486fa7 | 346 | #ifdef CONFIG_X86_32 |
ecacf09f | 347 | pmap = boot_params.efi_info.efi_memmap; |
05486fa7 PJ |
348 | #else |
349 | pmap = (boot_params.efi_info.efi_memmap | | |
350 | ((__u64)boot_params.efi_info.efi_memmap_hi<<32)); | |
ecacf09f HY |
351 | #endif |
352 | memmap.phys_map = (void *)pmap; | |
353 | memmap.nr_map = boot_params.efi_info.efi_memmap_size / | |
354 | boot_params.efi_info.efi_memdesc_size; | |
355 | memmap.desc_version = boot_params.efi_info.efi_memdesc_version; | |
356 | memmap.desc_size = boot_params.efi_info.efi_memdesc_size; | |
24aa0788 | 357 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
ecacf09f HY |
358 | } |
359 | ||
5b83683f HY |
360 | #if EFI_DEBUG |
361 | static void __init print_efi_memmap(void) | |
362 | { | |
363 | efi_memory_desc_t *md; | |
364 | void *p; | |
365 | int i; | |
366 | ||
367 | for (p = memmap.map, i = 0; | |
368 | p < memmap.map_end; | |
369 | p += memmap.desc_size, i++) { | |
370 | md = p; | |
e3cb3f5a | 371 | pr_info("mem%02u: type=%u, attr=0x%llx, " |
5b83683f HY |
372 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", |
373 | i, md->type, md->attribute, md->phys_addr, | |
374 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
375 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
376 | } | |
377 | } | |
378 | #endif /* EFI_DEBUG */ | |
379 | ||
916f676f MG |
380 | void __init efi_reserve_boot_services(void) |
381 | { | |
382 | void *p; | |
383 | ||
384 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
385 | efi_memory_desc_t *md = p; | |
7d68dc3f ML |
386 | u64 start = md->phys_addr; |
387 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
916f676f MG |
388 | |
389 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
390 | md->type != EFI_BOOT_SERVICES_DATA) | |
391 | continue; | |
7d68dc3f ML |
392 | /* Only reserve where possible: |
393 | * - Not within any already allocated areas | |
394 | * - Not over any memory area (really needed, if above?) | |
395 | * - Not within any part of the kernel | |
396 | * - Not the bios reserved area | |
397 | */ | |
398 | if ((start+size >= virt_to_phys(_text) | |
399 | && start <= virt_to_phys(_end)) || | |
400 | !e820_all_mapped(start, start+size, E820_RAM) || | |
bf61549a | 401 | memblock_is_region_reserved(start, size)) { |
7d68dc3f ML |
402 | /* Could not reserve, skip it */ |
403 | md->num_pages = 0; | |
e3cb3f5a | 404 | memblock_dbg("Could not reserve boot range " |
7d68dc3f ML |
405 | "[0x%010llx-0x%010llx]\n", |
406 | start, start+size-1); | |
407 | } else | |
24aa0788 | 408 | memblock_reserve(start, size); |
916f676f MG |
409 | } |
410 | } | |
411 | ||
412 | static void __init efi_free_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; | |
418 | unsigned long long start = md->phys_addr; | |
419 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
420 | ||
421 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
422 | md->type != EFI_BOOT_SERVICES_DATA) | |
423 | continue; | |
424 | ||
7d68dc3f ML |
425 | /* Could not reserve boot area */ |
426 | if (!size) | |
427 | continue; | |
428 | ||
916f676f MG |
429 | free_bootmem_late(start, size); |
430 | } | |
431 | } | |
432 | ||
140bf275 | 433 | static int __init efi_systab_init(void *phys) |
5b83683f | 434 | { |
beacfaac HY |
435 | efi.systab = early_ioremap((unsigned long)efi_phys.systab, |
436 | sizeof(efi_system_table_t)); | |
140bf275 | 437 | if (efi.systab == NULL) { |
e3cb3f5a | 438 | pr_err("Couldn't map the system table!\n"); |
140bf275 OJ |
439 | return -ENOMEM; |
440 | } | |
5b83683f | 441 | memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t)); |
beacfaac | 442 | early_iounmap(efi.systab, sizeof(efi_system_table_t)); |
5b83683f HY |
443 | efi.systab = &efi_systab; |
444 | ||
445 | /* | |
446 | * Verify the EFI Table | |
447 | */ | |
140bf275 | 448 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 449 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
450 | return -EINVAL; |
451 | } | |
5b83683f | 452 | if ((efi.systab->hdr.revision >> 16) == 0) |
e3cb3f5a | 453 | pr_err("Warning: System table version " |
5b83683f HY |
454 | "%d.%02d, expected 1.00 or greater!\n", |
455 | efi.systab->hdr.revision >> 16, | |
456 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
457 | |
458 | return 0; | |
83e7ee66 | 459 | } |
5b83683f | 460 | |
140bf275 | 461 | static int __init efi_config_init(u64 tables, int nr_tables) |
83e7ee66 OJ |
462 | { |
463 | efi_config_table_t *config_tables; | |
a6a46f41 | 464 | int i, sz = sizeof(efi_config_table_t); |
5b83683f HY |
465 | |
466 | /* | |
467 | * Let's see what config tables the firmware passed to us. | |
468 | */ | |
a6a46f41 OJ |
469 | config_tables = early_ioremap(efi.systab->tables, |
470 | efi.systab->nr_tables * sz); | |
140bf275 | 471 | if (config_tables == NULL) { |
e3cb3f5a | 472 | pr_err("Could not map Configuration table!\n"); |
140bf275 OJ |
473 | return -ENOMEM; |
474 | } | |
5b83683f | 475 | |
e3cb3f5a | 476 | pr_info(""); |
5b83683f | 477 | for (i = 0; i < efi.systab->nr_tables; i++) { |
a6a46f41 OJ |
478 | efi_guid_t guid = config_tables[i].guid; |
479 | unsigned long table = config_tables[i].table; | |
480 | ||
481 | if (!efi_guidcmp(guid, MPS_TABLE_GUID)) { | |
482 | efi.mps = table; | |
483 | pr_cont(" MPS=0x%lx ", table); | |
484 | } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) { | |
485 | efi.acpi20 = table; | |
486 | pr_cont(" ACPI 2.0=0x%lx ", table); | |
487 | } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) { | |
488 | efi.acpi = table; | |
489 | pr_cont(" ACPI=0x%lx ", table); | |
490 | } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) { | |
491 | efi.smbios = table; | |
492 | pr_cont(" SMBIOS=0x%lx ", table); | |
03b48632 | 493 | #ifdef CONFIG_X86_UV |
a6a46f41 OJ |
494 | } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) { |
495 | efi.uv_systab = table; | |
496 | pr_cont(" UVsystab=0x%lx ", table); | |
03b48632 | 497 | #endif |
a6a46f41 OJ |
498 | } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) { |
499 | efi.hcdp = table; | |
500 | pr_cont(" HCDP=0x%lx ", table); | |
501 | } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) { | |
502 | efi.uga = table; | |
503 | pr_cont(" UGA=0x%lx ", table); | |
5b83683f HY |
504 | } |
505 | } | |
e3cb3f5a | 506 | pr_cont("\n"); |
a6a46f41 | 507 | early_iounmap(config_tables, efi.systab->nr_tables * sz); |
140bf275 OJ |
508 | |
509 | return 0; | |
83e7ee66 OJ |
510 | } |
511 | ||
140bf275 | 512 | static int __init efi_runtime_init(void) |
83e7ee66 OJ |
513 | { |
514 | efi_runtime_services_t *runtime; | |
5b83683f HY |
515 | |
516 | /* | |
517 | * Check out the runtime services table. We need to map | |
518 | * the runtime services table so that we can grab the physical | |
519 | * address of several of the EFI runtime functions, needed to | |
520 | * set the firmware into virtual mode. | |
521 | */ | |
beacfaac HY |
522 | runtime = early_ioremap((unsigned long)efi.systab->runtime, |
523 | sizeof(efi_runtime_services_t)); | |
140bf275 | 524 | if (!runtime) { |
e3cb3f5a | 525 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
526 | return -ENOMEM; |
527 | } | |
528 | /* | |
529 | * We will only need *early* access to the following | |
530 | * two EFI runtime services before set_virtual_address_map | |
531 | * is invoked. | |
532 | */ | |
533 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; | |
534 | efi_phys.set_virtual_address_map = | |
535 | (efi_set_virtual_address_map_t *) | |
536 | runtime->set_virtual_address_map; | |
537 | /* | |
538 | * Make efi_get_time can be called before entering | |
539 | * virtual mode. | |
540 | */ | |
541 | efi.get_time = phys_efi_get_time; | |
beacfaac | 542 | early_iounmap(runtime, sizeof(efi_runtime_services_t)); |
140bf275 OJ |
543 | |
544 | return 0; | |
83e7ee66 | 545 | } |
5b83683f | 546 | |
140bf275 | 547 | static int __init efi_memmap_init(void) |
83e7ee66 | 548 | { |
5b83683f | 549 | /* Map the EFI memory map */ |
beacfaac HY |
550 | memmap.map = early_ioremap((unsigned long)memmap.phys_map, |
551 | memmap.nr_map * memmap.desc_size); | |
140bf275 | 552 | if (memmap.map == NULL) { |
e3cb3f5a | 553 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
554 | return -ENOMEM; |
555 | } | |
5b83683f | 556 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 557 | |
200001eb PJ |
558 | if (add_efi_memmap) |
559 | do_add_efi_memmap(); | |
140bf275 OJ |
560 | |
561 | return 0; | |
83e7ee66 OJ |
562 | } |
563 | ||
564 | void __init efi_init(void) | |
565 | { | |
566 | efi_char16_t *c16; | |
567 | char vendor[100] = "unknown"; | |
568 | int i = 0; | |
569 | void *tmp; | |
570 | ||
571 | #ifdef CONFIG_X86_32 | |
572 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; | |
573 | #else | |
574 | efi_phys.systab = (efi_system_table_t *) | |
575 | (boot_params.efi_info.efi_systab | | |
576 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
577 | #endif | |
578 | ||
140bf275 OJ |
579 | if (efi_systab_init(efi_phys.systab)) { |
580 | efi_enabled = 0; | |
581 | return; | |
582 | } | |
83e7ee66 OJ |
583 | |
584 | /* | |
585 | * Show what we know for posterity | |
586 | */ | |
587 | c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); | |
588 | if (c16) { | |
589 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
590 | vendor[i] = *c16++; | |
591 | vendor[i] = '\0'; | |
592 | } else | |
e3cb3f5a | 593 | pr_err("Could not map the firmware vendor!\n"); |
83e7ee66 OJ |
594 | early_iounmap(tmp, 2); |
595 | ||
e3cb3f5a OJ |
596 | pr_info("EFI v%u.%.02u by %s\n", |
597 | efi.systab->hdr.revision >> 16, | |
598 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 599 | |
140bf275 OJ |
600 | if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) { |
601 | efi_enabled = 0; | |
602 | return; | |
603 | } | |
83e7ee66 | 604 | |
140bf275 OJ |
605 | if (efi_runtime_init()) { |
606 | efi_enabled = 0; | |
607 | return; | |
608 | } | |
83e7ee66 | 609 | |
140bf275 OJ |
610 | if (efi_memmap_init()) { |
611 | efi_enabled = 0; | |
612 | return; | |
613 | } | |
5b83683f | 614 | |
772be899 | 615 | #ifdef CONFIG_X86_32 |
7bd867df FT |
616 | x86_platform.get_wallclock = efi_get_time; |
617 | x86_platform.set_wallclock = efi_set_rtc_mmss; | |
772be899 | 618 | #endif |
7bd867df | 619 | |
5b83683f HY |
620 | #if EFI_DEBUG |
621 | print_efi_memmap(); | |
622 | #endif | |
623 | } | |
624 | ||
9cd2b07c MG |
625 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
626 | { | |
627 | u64 addr, npages; | |
628 | ||
629 | addr = md->virt_addr; | |
630 | npages = md->num_pages; | |
631 | ||
632 | memrange_efi_to_native(&addr, &npages); | |
633 | ||
634 | if (executable) | |
635 | set_memory_x(addr, npages); | |
636 | else | |
637 | set_memory_nx(addr, npages); | |
638 | } | |
639 | ||
a2172e25 HY |
640 | static void __init runtime_code_page_mkexec(void) |
641 | { | |
642 | efi_memory_desc_t *md; | |
a2172e25 HY |
643 | void *p; |
644 | ||
a2172e25 HY |
645 | /* Make EFI runtime service code area executable */ |
646 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
647 | md = p; | |
1c083eb2 HY |
648 | |
649 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
650 | continue; | |
651 | ||
9cd2b07c | 652 | efi_set_executable(md, true); |
a2172e25 | 653 | } |
a2172e25 | 654 | } |
a2172e25 | 655 | |
5b83683f HY |
656 | /* |
657 | * This function will switch the EFI runtime services to virtual mode. | |
658 | * Essentially, look through the EFI memmap and map every region that | |
659 | * has the runtime attribute bit set in its memory descriptor and update | |
660 | * that memory descriptor with the virtual address obtained from ioremap(). | |
661 | * This enables the runtime services to be called without having to | |
662 | * thunk back into physical mode for every invocation. | |
663 | */ | |
664 | void __init efi_enter_virtual_mode(void) | |
665 | { | |
202f9d0a | 666 | efi_memory_desc_t *md, *prev_md = NULL; |
5b83683f | 667 | efi_status_t status; |
1c083eb2 | 668 | unsigned long size; |
dd39ecf5 | 669 | u64 end, systab, addr, npages, end_pfn; |
7cb00b72 MG |
670 | void *p, *va, *new_memmap = NULL; |
671 | int count = 0; | |
5b83683f HY |
672 | |
673 | efi.systab = NULL; | |
202f9d0a MG |
674 | |
675 | /* Merge contiguous regions of the same type and attribute */ | |
676 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
677 | u64 prev_size; | |
678 | md = p; | |
679 | ||
680 | if (!prev_md) { | |
681 | prev_md = md; | |
682 | continue; | |
683 | } | |
684 | ||
685 | if (prev_md->type != md->type || | |
686 | prev_md->attribute != md->attribute) { | |
687 | prev_md = md; | |
688 | continue; | |
689 | } | |
690 | ||
691 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
692 | ||
693 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
694 | prev_md->num_pages += md->num_pages; | |
695 | md->type = EFI_RESERVED_TYPE; | |
696 | md->attribute = 0; | |
697 | continue; | |
698 | } | |
699 | prev_md = md; | |
700 | } | |
701 | ||
5b83683f HY |
702 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
703 | md = p; | |
916f676f MG |
704 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && |
705 | md->type != EFI_BOOT_SERVICES_CODE && | |
706 | md->type != EFI_BOOT_SERVICES_DATA) | |
5b83683f | 707 | continue; |
1c083eb2 HY |
708 | |
709 | size = md->num_pages << EFI_PAGE_SHIFT; | |
710 | end = md->phys_addr + size; | |
711 | ||
dd39ecf5 HY |
712 | end_pfn = PFN_UP(end); |
713 | if (end_pfn <= max_low_pfn_mapped | |
714 | || (end_pfn > (1UL << (32 - PAGE_SHIFT)) | |
715 | && end_pfn <= max_pfn_mapped)) | |
1c083eb2 | 716 | va = __va(md->phys_addr); |
5b83683f | 717 | else |
6a7bbd57 | 718 | va = efi_ioremap(md->phys_addr, size, md->type); |
1c083eb2 | 719 | |
1c083eb2 HY |
720 | md->virt_addr = (u64) (unsigned long) va; |
721 | ||
722 | if (!va) { | |
e3cb3f5a | 723 | pr_err("ioremap of 0x%llX failed!\n", |
5b83683f | 724 | (unsigned long long)md->phys_addr); |
1c083eb2 HY |
725 | continue; |
726 | } | |
727 | ||
4a3575fd HY |
728 | if (!(md->attribute & EFI_MEMORY_WB)) { |
729 | addr = md->virt_addr; | |
730 | npages = md->num_pages; | |
731 | memrange_efi_to_native(&addr, &npages); | |
732 | set_memory_uc(addr, npages); | |
733 | } | |
e85f2051 | 734 | |
1c083eb2 HY |
735 | systab = (u64) (unsigned long) efi_phys.systab; |
736 | if (md->phys_addr <= systab && systab < end) { | |
737 | systab += md->virt_addr - md->phys_addr; | |
738 | efi.systab = (efi_system_table_t *) (unsigned long) systab; | |
739 | } | |
7cb00b72 MG |
740 | new_memmap = krealloc(new_memmap, |
741 | (count + 1) * memmap.desc_size, | |
742 | GFP_KERNEL); | |
743 | memcpy(new_memmap + (count * memmap.desc_size), md, | |
744 | memmap.desc_size); | |
745 | count++; | |
5b83683f HY |
746 | } |
747 | ||
748 | BUG_ON(!efi.systab); | |
749 | ||
750 | status = phys_efi_set_virtual_address_map( | |
7cb00b72 | 751 | memmap.desc_size * count, |
5b83683f HY |
752 | memmap.desc_size, |
753 | memmap.desc_version, | |
7cb00b72 | 754 | (efi_memory_desc_t *)__pa(new_memmap)); |
5b83683f HY |
755 | |
756 | if (status != EFI_SUCCESS) { | |
e3cb3f5a OJ |
757 | pr_alert("Unable to switch EFI into virtual mode " |
758 | "(status=%lx)!\n", status); | |
5b83683f HY |
759 | panic("EFI call to SetVirtualAddressMap() failed!"); |
760 | } | |
761 | ||
916f676f MG |
762 | /* |
763 | * Thankfully, it does seem that no runtime services other than | |
764 | * SetVirtualAddressMap() will touch boot services code, so we can | |
765 | * get rid of it all at this point | |
766 | */ | |
767 | efi_free_boot_services(); | |
768 | ||
5b83683f HY |
769 | /* |
770 | * Now that EFI is in virtual mode, update the function | |
771 | * pointers in the runtime service table to the new virtual addresses. | |
772 | * | |
773 | * Call EFI services through wrapper functions. | |
774 | */ | |
775 | efi.get_time = virt_efi_get_time; | |
776 | efi.set_time = virt_efi_set_time; | |
777 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
778 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
779 | efi.get_variable = virt_efi_get_variable; | |
780 | efi.get_next_variable = virt_efi_get_next_variable; | |
781 | efi.set_variable = virt_efi_set_variable; | |
782 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
783 | efi.reset_system = virt_efi_reset_system; | |
2b5e8ef3 | 784 | efi.set_virtual_address_map = NULL; |
3b370237 MG |
785 | efi.query_variable_info = virt_efi_query_variable_info; |
786 | efi.update_capsule = virt_efi_update_capsule; | |
787 | efi.query_capsule_caps = virt_efi_query_capsule_caps; | |
4de0d4a6 HY |
788 | if (__supported_pte_mask & _PAGE_NX) |
789 | runtime_code_page_mkexec(); | |
a3828064 HY |
790 | early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); |
791 | memmap.map = NULL; | |
7cb00b72 | 792 | kfree(new_memmap); |
5b83683f HY |
793 | } |
794 | ||
795 | /* | |
796 | * Convenience functions to obtain memory types and attributes | |
797 | */ | |
798 | u32 efi_mem_type(unsigned long phys_addr) | |
799 | { | |
800 | efi_memory_desc_t *md; | |
801 | void *p; | |
802 | ||
803 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
804 | md = p; | |
805 | if ((md->phys_addr <= phys_addr) && | |
806 | (phys_addr < (md->phys_addr + | |
807 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
808 | return md->type; | |
809 | } | |
810 | return 0; | |
811 | } | |
812 | ||
813 | u64 efi_mem_attributes(unsigned long phys_addr) | |
814 | { | |
815 | efi_memory_desc_t *md; | |
816 | void *p; | |
817 | ||
818 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
819 | md = p; | |
820 | if ((md->phys_addr <= phys_addr) && | |
821 | (phys_addr < (md->phys_addr + | |
822 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
823 | return md->attribute; | |
824 | } | |
825 | return 0; | |
826 | } |