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Commit | Line | Data |
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5b83683f HY |
1 | /* |
2 | * Common EFI (Extensible Firmware Interface) support functions | |
3 | * Based on Extensible Firmware Interface Specification version 1.0 | |
4 | * | |
5 | * Copyright (C) 1999 VA Linux Systems | |
6 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
7 | * Copyright (C) 1999-2002 Hewlett-Packard Co. | |
8 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
9 | * Stephane Eranian <eranian@hpl.hp.com> | |
10 | * Copyright (C) 2005-2008 Intel Co. | |
11 | * Fenghua Yu <fenghua.yu@intel.com> | |
12 | * Bibo Mao <bibo.mao@intel.com> | |
13 | * Chandramouli Narayanan <mouli@linux.intel.com> | |
14 | * Huang Ying <ying.huang@intel.com> | |
15 | * | |
16 | * Copied from efi_32.c to eliminate the duplicated code between EFI | |
17 | * 32/64 support code. --ying 2007-10-26 | |
18 | * | |
19 | * All EFI Runtime Services are not implemented yet as EFI only | |
20 | * supports physical mode addressing on SoftSDV. This is to be fixed | |
21 | * in a future version. --drummond 1999-07-20 | |
22 | * | |
23 | * Implemented EFI runtime services and virtual mode calls. --davidm | |
24 | * | |
25 | * Goutham Rao: <goutham.rao@intel.com> | |
26 | * Skip non-WB memory and ignore empty memory ranges. | |
27 | */ | |
28 | ||
e3cb3f5a OJ |
29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
30 | ||
5b83683f HY |
31 | #include <linux/kernel.h> |
32 | #include <linux/init.h> | |
33 | #include <linux/efi.h> | |
2223af38 | 34 | #include <linux/efi-bgrt.h> |
69c60c88 | 35 | #include <linux/export.h> |
5b83683f | 36 | #include <linux/bootmem.h> |
a9ce6bc1 | 37 | #include <linux/memblock.h> |
5b83683f HY |
38 | #include <linux/spinlock.h> |
39 | #include <linux/uaccess.h> | |
40 | #include <linux/time.h> | |
41 | #include <linux/io.h> | |
42 | #include <linux/reboot.h> | |
43 | #include <linux/bcd.h> | |
44 | ||
45 | #include <asm/setup.h> | |
46 | #include <asm/efi.h> | |
47 | #include <asm/time.h> | |
a2172e25 HY |
48 | #include <asm/cacheflush.h> |
49 | #include <asm/tlbflush.h> | |
7bd867df | 50 | #include <asm/x86_init.h> |
5b83683f HY |
51 | |
52 | #define EFI_DEBUG 1 | |
5b83683f HY |
53 | |
54 | int efi_enabled; | |
55 | EXPORT_SYMBOL(efi_enabled); | |
56 | ||
d80603c9 JB |
57 | struct efi __read_mostly efi = { |
58 | .mps = EFI_INVALID_TABLE_ADDR, | |
59 | .acpi = EFI_INVALID_TABLE_ADDR, | |
60 | .acpi20 = EFI_INVALID_TABLE_ADDR, | |
61 | .smbios = EFI_INVALID_TABLE_ADDR, | |
62 | .sal_systab = EFI_INVALID_TABLE_ADDR, | |
63 | .boot_info = EFI_INVALID_TABLE_ADDR, | |
64 | .hcdp = EFI_INVALID_TABLE_ADDR, | |
65 | .uga = EFI_INVALID_TABLE_ADDR, | |
66 | .uv_systab = EFI_INVALID_TABLE_ADDR, | |
67 | }; | |
5b83683f HY |
68 | EXPORT_SYMBOL(efi); |
69 | ||
70 | struct efi_memory_map memmap; | |
71 | ||
1adbfa35 OJ |
72 | bool efi_64bit; |
73 | static bool efi_native; | |
74 | ||
ecaea42e | 75 | static struct efi efi_phys __initdata; |
5b83683f HY |
76 | static efi_system_table_t efi_systab __initdata; |
77 | ||
8b2cb7a8 HY |
78 | static int __init setup_noefi(char *arg) |
79 | { | |
80 | efi_enabled = 0; | |
81 | return 0; | |
82 | } | |
83 | early_param("noefi", setup_noefi); | |
84 | ||
200001eb PJ |
85 | int add_efi_memmap; |
86 | EXPORT_SYMBOL(add_efi_memmap); | |
87 | ||
88 | static int __init setup_add_efi_memmap(char *arg) | |
89 | { | |
90 | add_efi_memmap = 1; | |
91 | return 0; | |
92 | } | |
93 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
94 | ||
95 | ||
5b83683f HY |
96 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
97 | { | |
ef68c8f8 JB |
98 | unsigned long flags; |
99 | efi_status_t status; | |
100 | ||
101 | spin_lock_irqsave(&rtc_lock, flags); | |
102 | status = efi_call_virt2(get_time, tm, tc); | |
103 | spin_unlock_irqrestore(&rtc_lock, flags); | |
104 | return status; | |
5b83683f HY |
105 | } |
106 | ||
107 | static efi_status_t virt_efi_set_time(efi_time_t *tm) | |
108 | { | |
ef68c8f8 JB |
109 | unsigned long flags; |
110 | efi_status_t status; | |
111 | ||
112 | spin_lock_irqsave(&rtc_lock, flags); | |
113 | status = efi_call_virt1(set_time, tm); | |
114 | spin_unlock_irqrestore(&rtc_lock, flags); | |
115 | return status; | |
5b83683f HY |
116 | } |
117 | ||
118 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, | |
119 | efi_bool_t *pending, | |
120 | efi_time_t *tm) | |
121 | { | |
ef68c8f8 JB |
122 | unsigned long flags; |
123 | efi_status_t status; | |
124 | ||
125 | spin_lock_irqsave(&rtc_lock, flags); | |
126 | status = efi_call_virt3(get_wakeup_time, | |
127 | enabled, pending, tm); | |
128 | spin_unlock_irqrestore(&rtc_lock, flags); | |
129 | return status; | |
5b83683f HY |
130 | } |
131 | ||
132 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
133 | { | |
ef68c8f8 JB |
134 | unsigned long flags; |
135 | efi_status_t status; | |
136 | ||
137 | spin_lock_irqsave(&rtc_lock, flags); | |
138 | status = efi_call_virt2(set_wakeup_time, | |
139 | enabled, tm); | |
140 | spin_unlock_irqrestore(&rtc_lock, flags); | |
141 | return status; | |
5b83683f HY |
142 | } |
143 | ||
144 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, | |
145 | efi_guid_t *vendor, | |
146 | u32 *attr, | |
147 | unsigned long *data_size, | |
148 | void *data) | |
149 | { | |
150 | return efi_call_virt5(get_variable, | |
151 | name, vendor, attr, | |
152 | data_size, data); | |
153 | } | |
154 | ||
155 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, | |
156 | efi_char16_t *name, | |
157 | efi_guid_t *vendor) | |
158 | { | |
159 | return efi_call_virt3(get_next_variable, | |
160 | name_size, name, vendor); | |
161 | } | |
162 | ||
163 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, | |
164 | efi_guid_t *vendor, | |
f7a2d73f | 165 | u32 attr, |
5b83683f HY |
166 | unsigned long data_size, |
167 | void *data) | |
168 | { | |
169 | return efi_call_virt5(set_variable, | |
170 | name, vendor, attr, | |
171 | data_size, data); | |
172 | } | |
173 | ||
3b370237 MG |
174 | static efi_status_t virt_efi_query_variable_info(u32 attr, |
175 | u64 *storage_space, | |
176 | u64 *remaining_space, | |
177 | u64 *max_variable_size) | |
178 | { | |
179 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
180 | return EFI_UNSUPPORTED; | |
181 | ||
182 | return efi_call_virt4(query_variable_info, attr, storage_space, | |
183 | remaining_space, max_variable_size); | |
184 | } | |
185 | ||
5b83683f HY |
186 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) |
187 | { | |
188 | return efi_call_virt1(get_next_high_mono_count, count); | |
189 | } | |
190 | ||
191 | static void virt_efi_reset_system(int reset_type, | |
192 | efi_status_t status, | |
193 | unsigned long data_size, | |
194 | efi_char16_t *data) | |
195 | { | |
196 | efi_call_virt4(reset_system, reset_type, status, | |
197 | data_size, data); | |
198 | } | |
199 | ||
3b370237 MG |
200 | static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, |
201 | unsigned long count, | |
202 | unsigned long sg_list) | |
203 | { | |
204 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
205 | return EFI_UNSUPPORTED; | |
206 | ||
207 | return efi_call_virt3(update_capsule, capsules, count, sg_list); | |
208 | } | |
209 | ||
210 | static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, | |
211 | unsigned long count, | |
212 | u64 *max_size, | |
213 | int *reset_type) | |
214 | { | |
215 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
216 | return EFI_UNSUPPORTED; | |
217 | ||
218 | return efi_call_virt4(query_capsule_caps, capsules, count, max_size, | |
219 | reset_type); | |
220 | } | |
221 | ||
5b83683f HY |
222 | static efi_status_t __init phys_efi_set_virtual_address_map( |
223 | unsigned long memory_map_size, | |
224 | unsigned long descriptor_size, | |
225 | u32 descriptor_version, | |
226 | efi_memory_desc_t *virtual_map) | |
227 | { | |
228 | efi_status_t status; | |
229 | ||
230 | efi_call_phys_prelog(); | |
231 | status = efi_call_phys4(efi_phys.set_virtual_address_map, | |
232 | memory_map_size, descriptor_size, | |
233 | descriptor_version, virtual_map); | |
234 | efi_call_phys_epilog(); | |
235 | return status; | |
236 | } | |
237 | ||
f026cfa8 PA |
238 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, |
239 | efi_time_cap_t *tc) | |
240 | { | |
241 | unsigned long flags; | |
242 | efi_status_t status; | |
243 | ||
244 | spin_lock_irqsave(&rtc_lock, flags); | |
245 | efi_call_phys_prelog(); | |
246 | status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), | |
247 | virt_to_phys(tc)); | |
248 | efi_call_phys_epilog(); | |
249 | spin_unlock_irqrestore(&rtc_lock, flags); | |
250 | return status; | |
251 | } | |
252 | ||
253 | int efi_set_rtc_mmss(unsigned long nowtime) | |
5b83683f HY |
254 | { |
255 | int real_seconds, real_minutes; | |
256 | efi_status_t status; | |
257 | efi_time_t eft; | |
258 | efi_time_cap_t cap; | |
259 | ||
260 | status = efi.get_time(&eft, &cap); | |
261 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 262 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
263 | return -1; |
264 | } | |
265 | ||
266 | real_seconds = nowtime % 60; | |
267 | real_minutes = nowtime / 60; | |
268 | if (((abs(real_minutes - eft.minute) + 15)/30) & 1) | |
269 | real_minutes += 30; | |
270 | real_minutes %= 60; | |
271 | eft.minute = real_minutes; | |
272 | eft.second = real_seconds; | |
273 | ||
274 | status = efi.set_time(&eft); | |
275 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 276 | pr_err("Oops: efitime: can't write time!\n"); |
5b83683f HY |
277 | return -1; |
278 | } | |
279 | return 0; | |
280 | } | |
281 | ||
f026cfa8 | 282 | unsigned long efi_get_time(void) |
5b83683f HY |
283 | { |
284 | efi_status_t status; | |
285 | efi_time_t eft; | |
286 | efi_time_cap_t cap; | |
287 | ||
288 | status = efi.get_time(&eft, &cap); | |
289 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 290 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
291 | |
292 | return mktime(eft.year, eft.month, eft.day, eft.hour, | |
293 | eft.minute, eft.second); | |
294 | } | |
295 | ||
69c91893 PJ |
296 | /* |
297 | * Tell the kernel about the EFI memory map. This might include | |
298 | * more than the max 128 entries that can fit in the e820 legacy | |
299 | * (zeropage) memory map. | |
300 | */ | |
301 | ||
200001eb | 302 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
303 | { |
304 | void *p; | |
305 | ||
306 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
307 | efi_memory_desc_t *md = p; | |
308 | unsigned long long start = md->phys_addr; | |
309 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
310 | int e820_type; | |
311 | ||
e2a71476 CW |
312 | switch (md->type) { |
313 | case EFI_LOADER_CODE: | |
314 | case EFI_LOADER_DATA: | |
315 | case EFI_BOOT_SERVICES_CODE: | |
316 | case EFI_BOOT_SERVICES_DATA: | |
317 | case EFI_CONVENTIONAL_MEMORY: | |
318 | if (md->attribute & EFI_MEMORY_WB) | |
319 | e820_type = E820_RAM; | |
320 | else | |
321 | e820_type = E820_RESERVED; | |
322 | break; | |
323 | case EFI_ACPI_RECLAIM_MEMORY: | |
324 | e820_type = E820_ACPI; | |
325 | break; | |
326 | case EFI_ACPI_MEMORY_NVS: | |
327 | e820_type = E820_NVS; | |
328 | break; | |
329 | case EFI_UNUSABLE_MEMORY: | |
330 | e820_type = E820_UNUSABLE; | |
331 | break; | |
332 | default: | |
333 | /* | |
334 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
335 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
336 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
337 | */ | |
69c91893 | 338 | e820_type = E820_RESERVED; |
e2a71476 CW |
339 | break; |
340 | } | |
d0be6bde | 341 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
342 | } |
343 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
344 | } | |
345 | ||
1adbfa35 | 346 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f HY |
347 | { |
348 | unsigned long pmap; | |
349 | ||
05486fa7 | 350 | #ifdef CONFIG_X86_32 |
1adbfa35 OJ |
351 | /* Can't handle data above 4GB at this time */ |
352 | if (boot_params.efi_info.efi_memmap_hi) { | |
353 | pr_err("Memory map is above 4GB, disabling EFI.\n"); | |
354 | return -EINVAL; | |
355 | } | |
ecacf09f | 356 | pmap = boot_params.efi_info.efi_memmap; |
05486fa7 PJ |
357 | #else |
358 | pmap = (boot_params.efi_info.efi_memmap | | |
359 | ((__u64)boot_params.efi_info.efi_memmap_hi<<32)); | |
ecacf09f HY |
360 | #endif |
361 | memmap.phys_map = (void *)pmap; | |
362 | memmap.nr_map = boot_params.efi_info.efi_memmap_size / | |
363 | boot_params.efi_info.efi_memdesc_size; | |
364 | memmap.desc_version = boot_params.efi_info.efi_memdesc_version; | |
365 | memmap.desc_size = boot_params.efi_info.efi_memdesc_size; | |
24aa0788 | 366 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 OJ |
367 | |
368 | return 0; | |
ecacf09f HY |
369 | } |
370 | ||
5b83683f HY |
371 | #if EFI_DEBUG |
372 | static void __init print_efi_memmap(void) | |
373 | { | |
374 | efi_memory_desc_t *md; | |
375 | void *p; | |
376 | int i; | |
377 | ||
378 | for (p = memmap.map, i = 0; | |
379 | p < memmap.map_end; | |
380 | p += memmap.desc_size, i++) { | |
381 | md = p; | |
e3cb3f5a | 382 | pr_info("mem%02u: type=%u, attr=0x%llx, " |
5b83683f HY |
383 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", |
384 | i, md->type, md->attribute, md->phys_addr, | |
385 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
386 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
387 | } | |
388 | } | |
389 | #endif /* EFI_DEBUG */ | |
390 | ||
916f676f MG |
391 | void __init efi_reserve_boot_services(void) |
392 | { | |
393 | void *p; | |
394 | ||
395 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
396 | efi_memory_desc_t *md = p; | |
7d68dc3f ML |
397 | u64 start = md->phys_addr; |
398 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
916f676f MG |
399 | |
400 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
401 | md->type != EFI_BOOT_SERVICES_DATA) | |
402 | continue; | |
7d68dc3f ML |
403 | /* Only reserve where possible: |
404 | * - Not within any already allocated areas | |
405 | * - Not over any memory area (really needed, if above?) | |
406 | * - Not within any part of the kernel | |
407 | * - Not the bios reserved area | |
408 | */ | |
409 | if ((start+size >= virt_to_phys(_text) | |
410 | && start <= virt_to_phys(_end)) || | |
411 | !e820_all_mapped(start, start+size, E820_RAM) || | |
bf61549a | 412 | memblock_is_region_reserved(start, size)) { |
7d68dc3f ML |
413 | /* Could not reserve, skip it */ |
414 | md->num_pages = 0; | |
e3cb3f5a | 415 | memblock_dbg("Could not reserve boot range " |
7d68dc3f ML |
416 | "[0x%010llx-0x%010llx]\n", |
417 | start, start+size-1); | |
418 | } else | |
24aa0788 | 419 | memblock_reserve(start, size); |
916f676f MG |
420 | } |
421 | } | |
422 | ||
78510792 JT |
423 | static void __init efi_unmap_memmap(void) |
424 | { | |
425 | if (memmap.map) { | |
426 | early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); | |
427 | memmap.map = NULL; | |
428 | } | |
429 | } | |
430 | ||
431 | void __init efi_free_boot_services(void) | |
916f676f MG |
432 | { |
433 | void *p; | |
434 | ||
78510792 JT |
435 | if (!efi_native) |
436 | return; | |
437 | ||
916f676f MG |
438 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
439 | efi_memory_desc_t *md = p; | |
440 | unsigned long long start = md->phys_addr; | |
441 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
442 | ||
443 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
444 | md->type != EFI_BOOT_SERVICES_DATA) | |
445 | continue; | |
446 | ||
7d68dc3f ML |
447 | /* Could not reserve boot area */ |
448 | if (!size) | |
449 | continue; | |
450 | ||
916f676f MG |
451 | free_bootmem_late(start, size); |
452 | } | |
78510792 JT |
453 | |
454 | efi_unmap_memmap(); | |
916f676f MG |
455 | } |
456 | ||
140bf275 | 457 | static int __init efi_systab_init(void *phys) |
5b83683f | 458 | { |
1adbfa35 OJ |
459 | if (efi_64bit) { |
460 | efi_system_table_64_t *systab64; | |
461 | u64 tmp = 0; | |
462 | ||
463 | systab64 = early_ioremap((unsigned long)phys, | |
464 | sizeof(*systab64)); | |
465 | if (systab64 == NULL) { | |
466 | pr_err("Couldn't map the system table!\n"); | |
467 | return -ENOMEM; | |
468 | } | |
469 | ||
470 | efi_systab.hdr = systab64->hdr; | |
471 | efi_systab.fw_vendor = systab64->fw_vendor; | |
472 | tmp |= systab64->fw_vendor; | |
473 | efi_systab.fw_revision = systab64->fw_revision; | |
474 | efi_systab.con_in_handle = systab64->con_in_handle; | |
475 | tmp |= systab64->con_in_handle; | |
476 | efi_systab.con_in = systab64->con_in; | |
477 | tmp |= systab64->con_in; | |
478 | efi_systab.con_out_handle = systab64->con_out_handle; | |
479 | tmp |= systab64->con_out_handle; | |
480 | efi_systab.con_out = systab64->con_out; | |
481 | tmp |= systab64->con_out; | |
482 | efi_systab.stderr_handle = systab64->stderr_handle; | |
483 | tmp |= systab64->stderr_handle; | |
484 | efi_systab.stderr = systab64->stderr; | |
485 | tmp |= systab64->stderr; | |
486 | efi_systab.runtime = (void *)(unsigned long)systab64->runtime; | |
487 | tmp |= systab64->runtime; | |
488 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; | |
489 | tmp |= systab64->boottime; | |
490 | efi_systab.nr_tables = systab64->nr_tables; | |
491 | efi_systab.tables = systab64->tables; | |
492 | tmp |= systab64->tables; | |
493 | ||
494 | early_iounmap(systab64, sizeof(*systab64)); | |
495 | #ifdef CONFIG_X86_32 | |
496 | if (tmp >> 32) { | |
497 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
498 | return -EINVAL; | |
499 | } | |
500 | #endif | |
501 | } else { | |
502 | efi_system_table_32_t *systab32; | |
503 | ||
504 | systab32 = early_ioremap((unsigned long)phys, | |
505 | sizeof(*systab32)); | |
506 | if (systab32 == NULL) { | |
507 | pr_err("Couldn't map the system table!\n"); | |
508 | return -ENOMEM; | |
509 | } | |
510 | ||
511 | efi_systab.hdr = systab32->hdr; | |
512 | efi_systab.fw_vendor = systab32->fw_vendor; | |
513 | efi_systab.fw_revision = systab32->fw_revision; | |
514 | efi_systab.con_in_handle = systab32->con_in_handle; | |
515 | efi_systab.con_in = systab32->con_in; | |
516 | efi_systab.con_out_handle = systab32->con_out_handle; | |
517 | efi_systab.con_out = systab32->con_out; | |
518 | efi_systab.stderr_handle = systab32->stderr_handle; | |
519 | efi_systab.stderr = systab32->stderr; | |
520 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
521 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
522 | efi_systab.nr_tables = systab32->nr_tables; | |
523 | efi_systab.tables = systab32->tables; | |
524 | ||
525 | early_iounmap(systab32, sizeof(*systab32)); | |
140bf275 | 526 | } |
1adbfa35 | 527 | |
5b83683f HY |
528 | efi.systab = &efi_systab; |
529 | ||
530 | /* | |
531 | * Verify the EFI Table | |
532 | */ | |
140bf275 | 533 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 534 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
535 | return -EINVAL; |
536 | } | |
5b83683f | 537 | if ((efi.systab->hdr.revision >> 16) == 0) |
e3cb3f5a | 538 | pr_err("Warning: System table version " |
5b83683f HY |
539 | "%d.%02d, expected 1.00 or greater!\n", |
540 | efi.systab->hdr.revision >> 16, | |
541 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
542 | |
543 | return 0; | |
83e7ee66 | 544 | } |
5b83683f | 545 | |
140bf275 | 546 | static int __init efi_config_init(u64 tables, int nr_tables) |
83e7ee66 | 547 | { |
1adbfa35 OJ |
548 | void *config_tables, *tablep; |
549 | int i, sz; | |
550 | ||
551 | if (efi_64bit) | |
552 | sz = sizeof(efi_config_table_64_t); | |
553 | else | |
554 | sz = sizeof(efi_config_table_32_t); | |
5b83683f HY |
555 | |
556 | /* | |
557 | * Let's see what config tables the firmware passed to us. | |
558 | */ | |
1adbfa35 | 559 | config_tables = early_ioremap(tables, nr_tables * sz); |
140bf275 | 560 | if (config_tables == NULL) { |
e3cb3f5a | 561 | pr_err("Could not map Configuration table!\n"); |
140bf275 OJ |
562 | return -ENOMEM; |
563 | } | |
5b83683f | 564 | |
1adbfa35 | 565 | tablep = config_tables; |
e3cb3f5a | 566 | pr_info(""); |
5b83683f | 567 | for (i = 0; i < efi.systab->nr_tables; i++) { |
1adbfa35 OJ |
568 | efi_guid_t guid; |
569 | unsigned long table; | |
570 | ||
571 | if (efi_64bit) { | |
572 | u64 table64; | |
573 | guid = ((efi_config_table_64_t *)tablep)->guid; | |
574 | table64 = ((efi_config_table_64_t *)tablep)->table; | |
575 | table = table64; | |
576 | #ifdef CONFIG_X86_32 | |
577 | if (table64 >> 32) { | |
578 | pr_cont("\n"); | |
579 | pr_err("Table located above 4GB, disabling EFI.\n"); | |
580 | early_iounmap(config_tables, | |
581 | efi.systab->nr_tables * sz); | |
582 | return -EINVAL; | |
583 | } | |
584 | #endif | |
585 | } else { | |
586 | guid = ((efi_config_table_32_t *)tablep)->guid; | |
587 | table = ((efi_config_table_32_t *)tablep)->table; | |
588 | } | |
a6a46f41 OJ |
589 | if (!efi_guidcmp(guid, MPS_TABLE_GUID)) { |
590 | efi.mps = table; | |
591 | pr_cont(" MPS=0x%lx ", table); | |
592 | } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) { | |
593 | efi.acpi20 = table; | |
594 | pr_cont(" ACPI 2.0=0x%lx ", table); | |
595 | } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) { | |
596 | efi.acpi = table; | |
597 | pr_cont(" ACPI=0x%lx ", table); | |
598 | } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) { | |
599 | efi.smbios = table; | |
600 | pr_cont(" SMBIOS=0x%lx ", table); | |
03b48632 | 601 | #ifdef CONFIG_X86_UV |
a6a46f41 OJ |
602 | } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) { |
603 | efi.uv_systab = table; | |
604 | pr_cont(" UVsystab=0x%lx ", table); | |
03b48632 | 605 | #endif |
a6a46f41 OJ |
606 | } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) { |
607 | efi.hcdp = table; | |
608 | pr_cont(" HCDP=0x%lx ", table); | |
609 | } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) { | |
610 | efi.uga = table; | |
611 | pr_cont(" UGA=0x%lx ", table); | |
5b83683f | 612 | } |
1adbfa35 | 613 | tablep += sz; |
5b83683f | 614 | } |
e3cb3f5a | 615 | pr_cont("\n"); |
a6a46f41 | 616 | early_iounmap(config_tables, efi.systab->nr_tables * sz); |
140bf275 | 617 | return 0; |
83e7ee66 OJ |
618 | } |
619 | ||
140bf275 | 620 | static int __init efi_runtime_init(void) |
83e7ee66 OJ |
621 | { |
622 | efi_runtime_services_t *runtime; | |
5b83683f HY |
623 | |
624 | /* | |
625 | * Check out the runtime services table. We need to map | |
626 | * the runtime services table so that we can grab the physical | |
627 | * address of several of the EFI runtime functions, needed to | |
628 | * set the firmware into virtual mode. | |
629 | */ | |
beacfaac HY |
630 | runtime = early_ioremap((unsigned long)efi.systab->runtime, |
631 | sizeof(efi_runtime_services_t)); | |
140bf275 | 632 | if (!runtime) { |
e3cb3f5a | 633 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
634 | return -ENOMEM; |
635 | } | |
636 | /* | |
637 | * We will only need *early* access to the following | |
f026cfa8 | 638 | * two EFI runtime services before set_virtual_address_map |
140bf275 OJ |
639 | * is invoked. |
640 | */ | |
f026cfa8 | 641 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; |
140bf275 OJ |
642 | efi_phys.set_virtual_address_map = |
643 | (efi_set_virtual_address_map_t *) | |
644 | runtime->set_virtual_address_map; | |
f026cfa8 PA |
645 | /* |
646 | * Make efi_get_time can be called before entering | |
647 | * virtual mode. | |
648 | */ | |
649 | efi.get_time = phys_efi_get_time; | |
beacfaac | 650 | early_iounmap(runtime, sizeof(efi_runtime_services_t)); |
140bf275 OJ |
651 | |
652 | return 0; | |
83e7ee66 | 653 | } |
5b83683f | 654 | |
140bf275 | 655 | static int __init efi_memmap_init(void) |
83e7ee66 | 656 | { |
5b83683f | 657 | /* Map the EFI memory map */ |
beacfaac HY |
658 | memmap.map = early_ioremap((unsigned long)memmap.phys_map, |
659 | memmap.nr_map * memmap.desc_size); | |
140bf275 | 660 | if (memmap.map == NULL) { |
e3cb3f5a | 661 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
662 | return -ENOMEM; |
663 | } | |
5b83683f | 664 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 665 | |
200001eb PJ |
666 | if (add_efi_memmap) |
667 | do_add_efi_memmap(); | |
140bf275 OJ |
668 | |
669 | return 0; | |
83e7ee66 OJ |
670 | } |
671 | ||
672 | void __init efi_init(void) | |
673 | { | |
674 | efi_char16_t *c16; | |
675 | char vendor[100] = "unknown"; | |
676 | int i = 0; | |
677 | void *tmp; | |
678 | ||
679 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
680 | if (boot_params.efi_info.efi_systab_hi || |
681 | boot_params.efi_info.efi_memmap_hi) { | |
682 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
683 | efi_enabled = 0; | |
684 | return; | |
685 | } | |
83e7ee66 | 686 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
1adbfa35 | 687 | efi_native = !efi_64bit; |
83e7ee66 OJ |
688 | #else |
689 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
690 | (boot_params.efi_info.efi_systab | |
691 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
692 | efi_native = efi_64bit; | |
83e7ee66 OJ |
693 | #endif |
694 | ||
140bf275 OJ |
695 | if (efi_systab_init(efi_phys.systab)) { |
696 | efi_enabled = 0; | |
697 | return; | |
698 | } | |
83e7ee66 OJ |
699 | |
700 | /* | |
701 | * Show what we know for posterity | |
702 | */ | |
703 | c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); | |
704 | if (c16) { | |
705 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
706 | vendor[i] = *c16++; | |
707 | vendor[i] = '\0'; | |
708 | } else | |
e3cb3f5a | 709 | pr_err("Could not map the firmware vendor!\n"); |
83e7ee66 OJ |
710 | early_iounmap(tmp, 2); |
711 | ||
e3cb3f5a OJ |
712 | pr_info("EFI v%u.%.02u by %s\n", |
713 | efi.systab->hdr.revision >> 16, | |
714 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 715 | |
140bf275 OJ |
716 | if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) { |
717 | efi_enabled = 0; | |
718 | return; | |
719 | } | |
83e7ee66 | 720 | |
1adbfa35 OJ |
721 | /* |
722 | * Note: We currently don't support runtime services on an EFI | |
723 | * that doesn't match the kernel 32/64-bit mode. | |
724 | */ | |
725 | ||
726 | if (!efi_native) | |
727 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); | |
728 | else if (efi_runtime_init()) { | |
140bf275 OJ |
729 | efi_enabled = 0; |
730 | return; | |
731 | } | |
83e7ee66 | 732 | |
140bf275 OJ |
733 | if (efi_memmap_init()) { |
734 | efi_enabled = 0; | |
735 | return; | |
736 | } | |
f026cfa8 | 737 | #ifdef CONFIG_X86_32 |
1adbfa35 OJ |
738 | if (efi_native) { |
739 | x86_platform.get_wallclock = efi_get_time; | |
740 | x86_platform.set_wallclock = efi_set_rtc_mmss; | |
741 | } | |
f026cfa8 | 742 | #endif |
7bd867df | 743 | |
5b83683f HY |
744 | #if EFI_DEBUG |
745 | print_efi_memmap(); | |
746 | #endif | |
747 | } | |
748 | ||
2223af38 JT |
749 | void __init efi_late_init(void) |
750 | { | |
751 | efi_bgrt_init(); | |
752 | } | |
753 | ||
9cd2b07c MG |
754 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
755 | { | |
756 | u64 addr, npages; | |
757 | ||
758 | addr = md->virt_addr; | |
759 | npages = md->num_pages; | |
760 | ||
761 | memrange_efi_to_native(&addr, &npages); | |
762 | ||
763 | if (executable) | |
764 | set_memory_x(addr, npages); | |
765 | else | |
766 | set_memory_nx(addr, npages); | |
767 | } | |
768 | ||
a2172e25 HY |
769 | static void __init runtime_code_page_mkexec(void) |
770 | { | |
771 | efi_memory_desc_t *md; | |
a2172e25 HY |
772 | void *p; |
773 | ||
a2172e25 HY |
774 | /* Make EFI runtime service code area executable */ |
775 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
776 | md = p; | |
1c083eb2 HY |
777 | |
778 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
779 | continue; | |
780 | ||
9cd2b07c | 781 | efi_set_executable(md, true); |
a2172e25 | 782 | } |
a2172e25 | 783 | } |
a2172e25 | 784 | |
7bc90e01 JT |
785 | /* |
786 | * We can't ioremap data in EFI boot services RAM, because we've already mapped | |
787 | * it as RAM. So, look it up in the existing EFI memory map instead. Only | |
788 | * callable after efi_enter_virtual_mode and before efi_free_boot_services. | |
789 | */ | |
790 | void __iomem *efi_lookup_mapped_addr(u64 phys_addr) | |
791 | { | |
792 | void *p; | |
793 | if (WARN_ON(!memmap.map)) | |
794 | return NULL; | |
795 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
796 | efi_memory_desc_t *md = p; | |
797 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
798 | u64 end = md->phys_addr + size; | |
799 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && | |
800 | md->type != EFI_BOOT_SERVICES_CODE && | |
801 | md->type != EFI_BOOT_SERVICES_DATA) | |
802 | continue; | |
803 | if (!md->virt_addr) | |
804 | continue; | |
805 | if (phys_addr >= md->phys_addr && phys_addr < end) { | |
806 | phys_addr += md->virt_addr - md->phys_addr; | |
807 | return (__force void __iomem *)(unsigned long)phys_addr; | |
808 | } | |
809 | } | |
810 | return NULL; | |
811 | } | |
812 | ||
5b83683f HY |
813 | /* |
814 | * This function will switch the EFI runtime services to virtual mode. | |
815 | * Essentially, look through the EFI memmap and map every region that | |
816 | * has the runtime attribute bit set in its memory descriptor and update | |
817 | * that memory descriptor with the virtual address obtained from ioremap(). | |
818 | * This enables the runtime services to be called without having to | |
819 | * thunk back into physical mode for every invocation. | |
820 | */ | |
821 | void __init efi_enter_virtual_mode(void) | |
822 | { | |
202f9d0a | 823 | efi_memory_desc_t *md, *prev_md = NULL; |
5b83683f | 824 | efi_status_t status; |
1c083eb2 | 825 | unsigned long size; |
dd39ecf5 | 826 | u64 end, systab, addr, npages, end_pfn; |
7cb00b72 MG |
827 | void *p, *va, *new_memmap = NULL; |
828 | int count = 0; | |
5b83683f HY |
829 | |
830 | efi.systab = NULL; | |
202f9d0a | 831 | |
1adbfa35 OJ |
832 | /* |
833 | * We don't do virtual mode, since we don't do runtime services, on | |
834 | * non-native EFI | |
835 | */ | |
836 | ||
78510792 JT |
837 | if (!efi_native) { |
838 | efi_unmap_memmap(); | |
839 | return; | |
840 | } | |
1adbfa35 | 841 | |
202f9d0a MG |
842 | /* Merge contiguous regions of the same type and attribute */ |
843 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
844 | u64 prev_size; | |
845 | md = p; | |
846 | ||
847 | if (!prev_md) { | |
848 | prev_md = md; | |
849 | continue; | |
850 | } | |
851 | ||
852 | if (prev_md->type != md->type || | |
853 | prev_md->attribute != md->attribute) { | |
854 | prev_md = md; | |
855 | continue; | |
856 | } | |
857 | ||
858 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
859 | ||
860 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
861 | prev_md->num_pages += md->num_pages; | |
862 | md->type = EFI_RESERVED_TYPE; | |
863 | md->attribute = 0; | |
864 | continue; | |
865 | } | |
866 | prev_md = md; | |
867 | } | |
868 | ||
5b83683f HY |
869 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
870 | md = p; | |
916f676f MG |
871 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && |
872 | md->type != EFI_BOOT_SERVICES_CODE && | |
873 | md->type != EFI_BOOT_SERVICES_DATA) | |
5b83683f | 874 | continue; |
1c083eb2 HY |
875 | |
876 | size = md->num_pages << EFI_PAGE_SHIFT; | |
877 | end = md->phys_addr + size; | |
878 | ||
dd39ecf5 HY |
879 | end_pfn = PFN_UP(end); |
880 | if (end_pfn <= max_low_pfn_mapped | |
881 | || (end_pfn > (1UL << (32 - PAGE_SHIFT)) | |
882 | && end_pfn <= max_pfn_mapped)) | |
1c083eb2 | 883 | va = __va(md->phys_addr); |
5b83683f | 884 | else |
6a7bbd57 | 885 | va = efi_ioremap(md->phys_addr, size, md->type); |
1c083eb2 | 886 | |
1c083eb2 HY |
887 | md->virt_addr = (u64) (unsigned long) va; |
888 | ||
889 | if (!va) { | |
e3cb3f5a | 890 | pr_err("ioremap of 0x%llX failed!\n", |
5b83683f | 891 | (unsigned long long)md->phys_addr); |
1c083eb2 HY |
892 | continue; |
893 | } | |
894 | ||
4a3575fd HY |
895 | if (!(md->attribute & EFI_MEMORY_WB)) { |
896 | addr = md->virt_addr; | |
897 | npages = md->num_pages; | |
898 | memrange_efi_to_native(&addr, &npages); | |
899 | set_memory_uc(addr, npages); | |
900 | } | |
e85f2051 | 901 | |
1c083eb2 HY |
902 | systab = (u64) (unsigned long) efi_phys.systab; |
903 | if (md->phys_addr <= systab && systab < end) { | |
904 | systab += md->virt_addr - md->phys_addr; | |
905 | efi.systab = (efi_system_table_t *) (unsigned long) systab; | |
906 | } | |
7cb00b72 MG |
907 | new_memmap = krealloc(new_memmap, |
908 | (count + 1) * memmap.desc_size, | |
909 | GFP_KERNEL); | |
910 | memcpy(new_memmap + (count * memmap.desc_size), md, | |
911 | memmap.desc_size); | |
912 | count++; | |
5b83683f HY |
913 | } |
914 | ||
915 | BUG_ON(!efi.systab); | |
916 | ||
917 | status = phys_efi_set_virtual_address_map( | |
7cb00b72 | 918 | memmap.desc_size * count, |
5b83683f HY |
919 | memmap.desc_size, |
920 | memmap.desc_version, | |
7cb00b72 | 921 | (efi_memory_desc_t *)__pa(new_memmap)); |
5b83683f HY |
922 | |
923 | if (status != EFI_SUCCESS) { | |
e3cb3f5a OJ |
924 | pr_alert("Unable to switch EFI into virtual mode " |
925 | "(status=%lx)!\n", status); | |
5b83683f HY |
926 | panic("EFI call to SetVirtualAddressMap() failed!"); |
927 | } | |
928 | ||
929 | /* | |
930 | * Now that EFI is in virtual mode, update the function | |
931 | * pointers in the runtime service table to the new virtual addresses. | |
932 | * | |
933 | * Call EFI services through wrapper functions. | |
934 | */ | |
d6cf86d8 | 935 | efi.runtime_version = efi_systab.fw_revision; |
5b83683f HY |
936 | efi.get_time = virt_efi_get_time; |
937 | efi.set_time = virt_efi_set_time; | |
938 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
939 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
940 | efi.get_variable = virt_efi_get_variable; | |
941 | efi.get_next_variable = virt_efi_get_next_variable; | |
942 | efi.set_variable = virt_efi_set_variable; | |
943 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
944 | efi.reset_system = virt_efi_reset_system; | |
2b5e8ef3 | 945 | efi.set_virtual_address_map = NULL; |
3b370237 MG |
946 | efi.query_variable_info = virt_efi_query_variable_info; |
947 | efi.update_capsule = virt_efi_update_capsule; | |
948 | efi.query_capsule_caps = virt_efi_query_capsule_caps; | |
4de0d4a6 HY |
949 | if (__supported_pte_mask & _PAGE_NX) |
950 | runtime_code_page_mkexec(); | |
1adbfa35 | 951 | |
7cb00b72 | 952 | kfree(new_memmap); |
5b83683f HY |
953 | } |
954 | ||
955 | /* | |
956 | * Convenience functions to obtain memory types and attributes | |
957 | */ | |
958 | u32 efi_mem_type(unsigned long phys_addr) | |
959 | { | |
960 | efi_memory_desc_t *md; | |
961 | void *p; | |
962 | ||
963 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
964 | md = p; | |
965 | if ((md->phys_addr <= phys_addr) && | |
966 | (phys_addr < (md->phys_addr + | |
967 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
968 | return md->type; | |
969 | } | |
970 | return 0; | |
971 | } | |
972 | ||
973 | u64 efi_mem_attributes(unsigned long phys_addr) | |
974 | { | |
975 | efi_memory_desc_t *md; | |
976 | void *p; | |
977 | ||
978 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
979 | md = p; | |
980 | if ((md->phys_addr <= phys_addr) && | |
981 | (phys_addr < (md->phys_addr + | |
982 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
983 | return md->attribute; | |
984 | } | |
985 | return 0; | |
986 | } |