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> |
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 | 72 | bool efi_64bit; |
1adbfa35 | 73 | |
ecaea42e | 74 | static struct efi efi_phys __initdata; |
5b83683f HY |
75 | static efi_system_table_t efi_systab __initdata; |
76 | ||
5189c2a7 OJ |
77 | static inline bool efi_is_native(void) |
78 | { | |
79 | return IS_ENABLED(CONFIG_X86_64) == efi_64bit; | |
80 | } | |
81 | ||
8b2cb7a8 HY |
82 | static int __init setup_noefi(char *arg) |
83 | { | |
84 | efi_enabled = 0; | |
85 | return 0; | |
86 | } | |
87 | early_param("noefi", setup_noefi); | |
88 | ||
200001eb PJ |
89 | int add_efi_memmap; |
90 | EXPORT_SYMBOL(add_efi_memmap); | |
91 | ||
92 | static int __init setup_add_efi_memmap(char *arg) | |
93 | { | |
94 | add_efi_memmap = 1; | |
95 | return 0; | |
96 | } | |
97 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
98 | ||
99 | ||
5b83683f HY |
100 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
101 | { | |
ef68c8f8 JB |
102 | unsigned long flags; |
103 | efi_status_t status; | |
104 | ||
105 | spin_lock_irqsave(&rtc_lock, flags); | |
106 | status = efi_call_virt2(get_time, tm, tc); | |
107 | spin_unlock_irqrestore(&rtc_lock, flags); | |
108 | return status; | |
5b83683f HY |
109 | } |
110 | ||
111 | static efi_status_t virt_efi_set_time(efi_time_t *tm) | |
112 | { | |
ef68c8f8 JB |
113 | unsigned long flags; |
114 | efi_status_t status; | |
115 | ||
116 | spin_lock_irqsave(&rtc_lock, flags); | |
117 | status = efi_call_virt1(set_time, tm); | |
118 | spin_unlock_irqrestore(&rtc_lock, flags); | |
119 | return status; | |
5b83683f HY |
120 | } |
121 | ||
122 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, | |
123 | efi_bool_t *pending, | |
124 | efi_time_t *tm) | |
125 | { | |
ef68c8f8 JB |
126 | unsigned long flags; |
127 | efi_status_t status; | |
128 | ||
129 | spin_lock_irqsave(&rtc_lock, flags); | |
130 | status = efi_call_virt3(get_wakeup_time, | |
131 | enabled, pending, tm); | |
132 | spin_unlock_irqrestore(&rtc_lock, flags); | |
133 | return status; | |
5b83683f HY |
134 | } |
135 | ||
136 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
137 | { | |
ef68c8f8 JB |
138 | unsigned long flags; |
139 | efi_status_t status; | |
140 | ||
141 | spin_lock_irqsave(&rtc_lock, flags); | |
142 | status = efi_call_virt2(set_wakeup_time, | |
143 | enabled, tm); | |
144 | spin_unlock_irqrestore(&rtc_lock, flags); | |
145 | return status; | |
5b83683f HY |
146 | } |
147 | ||
148 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, | |
149 | efi_guid_t *vendor, | |
150 | u32 *attr, | |
151 | unsigned long *data_size, | |
152 | void *data) | |
153 | { | |
154 | return efi_call_virt5(get_variable, | |
155 | name, vendor, attr, | |
156 | data_size, data); | |
157 | } | |
158 | ||
159 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, | |
160 | efi_char16_t *name, | |
161 | efi_guid_t *vendor) | |
162 | { | |
163 | return efi_call_virt3(get_next_variable, | |
164 | name_size, name, vendor); | |
165 | } | |
166 | ||
167 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, | |
168 | efi_guid_t *vendor, | |
f7a2d73f | 169 | u32 attr, |
5b83683f HY |
170 | unsigned long data_size, |
171 | void *data) | |
172 | { | |
173 | return efi_call_virt5(set_variable, | |
174 | name, vendor, attr, | |
175 | data_size, data); | |
176 | } | |
177 | ||
3b370237 MG |
178 | static efi_status_t virt_efi_query_variable_info(u32 attr, |
179 | u64 *storage_space, | |
180 | u64 *remaining_space, | |
181 | u64 *max_variable_size) | |
182 | { | |
183 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
184 | return EFI_UNSUPPORTED; | |
185 | ||
186 | return efi_call_virt4(query_variable_info, attr, storage_space, | |
187 | remaining_space, max_variable_size); | |
188 | } | |
189 | ||
5b83683f HY |
190 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) |
191 | { | |
192 | return efi_call_virt1(get_next_high_mono_count, count); | |
193 | } | |
194 | ||
195 | static void virt_efi_reset_system(int reset_type, | |
196 | efi_status_t status, | |
197 | unsigned long data_size, | |
198 | efi_char16_t *data) | |
199 | { | |
200 | efi_call_virt4(reset_system, reset_type, status, | |
201 | data_size, data); | |
202 | } | |
203 | ||
3b370237 MG |
204 | static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, |
205 | unsigned long count, | |
206 | unsigned long sg_list) | |
207 | { | |
208 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
209 | return EFI_UNSUPPORTED; | |
210 | ||
211 | return efi_call_virt3(update_capsule, capsules, count, sg_list); | |
212 | } | |
213 | ||
214 | static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, | |
215 | unsigned long count, | |
216 | u64 *max_size, | |
217 | int *reset_type) | |
218 | { | |
219 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
220 | return EFI_UNSUPPORTED; | |
221 | ||
222 | return efi_call_virt4(query_capsule_caps, capsules, count, max_size, | |
223 | reset_type); | |
224 | } | |
225 | ||
5b83683f HY |
226 | static efi_status_t __init phys_efi_set_virtual_address_map( |
227 | unsigned long memory_map_size, | |
228 | unsigned long descriptor_size, | |
229 | u32 descriptor_version, | |
230 | efi_memory_desc_t *virtual_map) | |
231 | { | |
232 | efi_status_t status; | |
233 | ||
234 | efi_call_phys_prelog(); | |
235 | status = efi_call_phys4(efi_phys.set_virtual_address_map, | |
236 | memory_map_size, descriptor_size, | |
237 | descriptor_version, virtual_map); | |
238 | efi_call_phys_epilog(); | |
239 | return status; | |
240 | } | |
241 | ||
11520e5e LT |
242 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, |
243 | efi_time_cap_t *tc) | |
244 | { | |
245 | unsigned long flags; | |
246 | efi_status_t status; | |
247 | ||
248 | spin_lock_irqsave(&rtc_lock, flags); | |
249 | efi_call_phys_prelog(); | |
250 | status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), | |
251 | virt_to_phys(tc)); | |
252 | efi_call_phys_epilog(); | |
253 | spin_unlock_irqrestore(&rtc_lock, flags); | |
254 | return status; | |
255 | } | |
256 | ||
257 | int efi_set_rtc_mmss(unsigned long nowtime) | |
5b83683f HY |
258 | { |
259 | int real_seconds, real_minutes; | |
260 | efi_status_t status; | |
261 | efi_time_t eft; | |
262 | efi_time_cap_t cap; | |
263 | ||
264 | status = efi.get_time(&eft, &cap); | |
265 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 266 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
267 | return -1; |
268 | } | |
269 | ||
270 | real_seconds = nowtime % 60; | |
271 | real_minutes = nowtime / 60; | |
272 | if (((abs(real_minutes - eft.minute) + 15)/30) & 1) | |
273 | real_minutes += 30; | |
274 | real_minutes %= 60; | |
275 | eft.minute = real_minutes; | |
276 | eft.second = real_seconds; | |
277 | ||
278 | status = efi.set_time(&eft); | |
279 | if (status != EFI_SUCCESS) { | |
e3cb3f5a | 280 | pr_err("Oops: efitime: can't write time!\n"); |
5b83683f HY |
281 | return -1; |
282 | } | |
283 | return 0; | |
284 | } | |
285 | ||
11520e5e | 286 | unsigned long efi_get_time(void) |
5b83683f HY |
287 | { |
288 | efi_status_t status; | |
289 | efi_time_t eft; | |
290 | efi_time_cap_t cap; | |
291 | ||
292 | status = efi.get_time(&eft, &cap); | |
293 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 294 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f HY |
295 | |
296 | return mktime(eft.year, eft.month, eft.day, eft.hour, | |
297 | eft.minute, eft.second); | |
298 | } | |
299 | ||
69c91893 PJ |
300 | /* |
301 | * Tell the kernel about the EFI memory map. This might include | |
302 | * more than the max 128 entries that can fit in the e820 legacy | |
303 | * (zeropage) memory map. | |
304 | */ | |
305 | ||
200001eb | 306 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
307 | { |
308 | void *p; | |
309 | ||
310 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
311 | efi_memory_desc_t *md = p; | |
312 | unsigned long long start = md->phys_addr; | |
313 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
314 | int e820_type; | |
315 | ||
e2a71476 CW |
316 | switch (md->type) { |
317 | case EFI_LOADER_CODE: | |
318 | case EFI_LOADER_DATA: | |
319 | case EFI_BOOT_SERVICES_CODE: | |
320 | case EFI_BOOT_SERVICES_DATA: | |
321 | case EFI_CONVENTIONAL_MEMORY: | |
322 | if (md->attribute & EFI_MEMORY_WB) | |
323 | e820_type = E820_RAM; | |
324 | else | |
325 | e820_type = E820_RESERVED; | |
326 | break; | |
327 | case EFI_ACPI_RECLAIM_MEMORY: | |
328 | e820_type = E820_ACPI; | |
329 | break; | |
330 | case EFI_ACPI_MEMORY_NVS: | |
331 | e820_type = E820_NVS; | |
332 | break; | |
333 | case EFI_UNUSABLE_MEMORY: | |
334 | e820_type = E820_UNUSABLE; | |
335 | break; | |
336 | default: | |
337 | /* | |
338 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
339 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
340 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
341 | */ | |
69c91893 | 342 | e820_type = E820_RESERVED; |
e2a71476 CW |
343 | break; |
344 | } | |
d0be6bde | 345 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
346 | } |
347 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
348 | } | |
349 | ||
1adbfa35 | 350 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f HY |
351 | { |
352 | unsigned long pmap; | |
353 | ||
05486fa7 | 354 | #ifdef CONFIG_X86_32 |
1adbfa35 OJ |
355 | /* Can't handle data above 4GB at this time */ |
356 | if (boot_params.efi_info.efi_memmap_hi) { | |
357 | pr_err("Memory map is above 4GB, disabling EFI.\n"); | |
358 | return -EINVAL; | |
359 | } | |
ecacf09f | 360 | pmap = boot_params.efi_info.efi_memmap; |
05486fa7 PJ |
361 | #else |
362 | pmap = (boot_params.efi_info.efi_memmap | | |
363 | ((__u64)boot_params.efi_info.efi_memmap_hi<<32)); | |
ecacf09f HY |
364 | #endif |
365 | memmap.phys_map = (void *)pmap; | |
366 | memmap.nr_map = boot_params.efi_info.efi_memmap_size / | |
367 | boot_params.efi_info.efi_memdesc_size; | |
368 | memmap.desc_version = boot_params.efi_info.efi_memdesc_version; | |
369 | memmap.desc_size = boot_params.efi_info.efi_memdesc_size; | |
24aa0788 | 370 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 OJ |
371 | |
372 | return 0; | |
ecacf09f HY |
373 | } |
374 | ||
5b83683f HY |
375 | #if EFI_DEBUG |
376 | static void __init print_efi_memmap(void) | |
377 | { | |
378 | efi_memory_desc_t *md; | |
379 | void *p; | |
380 | int i; | |
381 | ||
382 | for (p = memmap.map, i = 0; | |
383 | p < memmap.map_end; | |
384 | p += memmap.desc_size, i++) { | |
385 | md = p; | |
e3cb3f5a | 386 | pr_info("mem%02u: type=%u, attr=0x%llx, " |
5b83683f HY |
387 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", |
388 | i, md->type, md->attribute, md->phys_addr, | |
389 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
390 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
391 | } | |
392 | } | |
393 | #endif /* EFI_DEBUG */ | |
394 | ||
916f676f MG |
395 | void __init efi_reserve_boot_services(void) |
396 | { | |
397 | void *p; | |
398 | ||
399 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
400 | efi_memory_desc_t *md = p; | |
7d68dc3f ML |
401 | u64 start = md->phys_addr; |
402 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
916f676f MG |
403 | |
404 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
405 | md->type != EFI_BOOT_SERVICES_DATA) | |
406 | continue; | |
7d68dc3f ML |
407 | /* Only reserve where possible: |
408 | * - Not within any already allocated areas | |
409 | * - Not over any memory area (really needed, if above?) | |
410 | * - Not within any part of the kernel | |
411 | * - Not the bios reserved area | |
412 | */ | |
413 | if ((start+size >= virt_to_phys(_text) | |
414 | && start <= virt_to_phys(_end)) || | |
415 | !e820_all_mapped(start, start+size, E820_RAM) || | |
bf61549a | 416 | memblock_is_region_reserved(start, size)) { |
7d68dc3f ML |
417 | /* Could not reserve, skip it */ |
418 | md->num_pages = 0; | |
e3cb3f5a | 419 | memblock_dbg("Could not reserve boot range " |
7d68dc3f ML |
420 | "[0x%010llx-0x%010llx]\n", |
421 | start, start+size-1); | |
422 | } else | |
24aa0788 | 423 | memblock_reserve(start, size); |
916f676f MG |
424 | } |
425 | } | |
426 | ||
5189c2a7 | 427 | void __init efi_unmap_memmap(void) |
78510792 JT |
428 | { |
429 | if (memmap.map) { | |
430 | early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); | |
431 | memmap.map = NULL; | |
432 | } | |
433 | } | |
434 | ||
435 | void __init efi_free_boot_services(void) | |
916f676f MG |
436 | { |
437 | void *p; | |
438 | ||
5189c2a7 | 439 | if (!efi_is_native()) |
78510792 JT |
440 | return; |
441 | ||
916f676f MG |
442 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
443 | efi_memory_desc_t *md = p; | |
444 | unsigned long long start = md->phys_addr; | |
445 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
446 | ||
447 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
448 | md->type != EFI_BOOT_SERVICES_DATA) | |
449 | continue; | |
450 | ||
7d68dc3f ML |
451 | /* Could not reserve boot area */ |
452 | if (!size) | |
453 | continue; | |
454 | ||
916f676f MG |
455 | free_bootmem_late(start, size); |
456 | } | |
78510792 JT |
457 | |
458 | efi_unmap_memmap(); | |
916f676f MG |
459 | } |
460 | ||
140bf275 | 461 | static int __init efi_systab_init(void *phys) |
5b83683f | 462 | { |
1adbfa35 OJ |
463 | if (efi_64bit) { |
464 | efi_system_table_64_t *systab64; | |
465 | u64 tmp = 0; | |
466 | ||
467 | systab64 = early_ioremap((unsigned long)phys, | |
468 | sizeof(*systab64)); | |
469 | if (systab64 == NULL) { | |
470 | pr_err("Couldn't map the system table!\n"); | |
471 | return -ENOMEM; | |
472 | } | |
473 | ||
474 | efi_systab.hdr = systab64->hdr; | |
475 | efi_systab.fw_vendor = systab64->fw_vendor; | |
476 | tmp |= systab64->fw_vendor; | |
477 | efi_systab.fw_revision = systab64->fw_revision; | |
478 | efi_systab.con_in_handle = systab64->con_in_handle; | |
479 | tmp |= systab64->con_in_handle; | |
480 | efi_systab.con_in = systab64->con_in; | |
481 | tmp |= systab64->con_in; | |
482 | efi_systab.con_out_handle = systab64->con_out_handle; | |
483 | tmp |= systab64->con_out_handle; | |
484 | efi_systab.con_out = systab64->con_out; | |
485 | tmp |= systab64->con_out; | |
486 | efi_systab.stderr_handle = systab64->stderr_handle; | |
487 | tmp |= systab64->stderr_handle; | |
488 | efi_systab.stderr = systab64->stderr; | |
489 | tmp |= systab64->stderr; | |
490 | efi_systab.runtime = (void *)(unsigned long)systab64->runtime; | |
491 | tmp |= systab64->runtime; | |
492 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; | |
493 | tmp |= systab64->boottime; | |
494 | efi_systab.nr_tables = systab64->nr_tables; | |
495 | efi_systab.tables = systab64->tables; | |
496 | tmp |= systab64->tables; | |
497 | ||
498 | early_iounmap(systab64, sizeof(*systab64)); | |
499 | #ifdef CONFIG_X86_32 | |
500 | if (tmp >> 32) { | |
501 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
502 | return -EINVAL; | |
503 | } | |
504 | #endif | |
505 | } else { | |
506 | efi_system_table_32_t *systab32; | |
507 | ||
508 | systab32 = early_ioremap((unsigned long)phys, | |
509 | sizeof(*systab32)); | |
510 | if (systab32 == NULL) { | |
511 | pr_err("Couldn't map the system table!\n"); | |
512 | return -ENOMEM; | |
513 | } | |
514 | ||
515 | efi_systab.hdr = systab32->hdr; | |
516 | efi_systab.fw_vendor = systab32->fw_vendor; | |
517 | efi_systab.fw_revision = systab32->fw_revision; | |
518 | efi_systab.con_in_handle = systab32->con_in_handle; | |
519 | efi_systab.con_in = systab32->con_in; | |
520 | efi_systab.con_out_handle = systab32->con_out_handle; | |
521 | efi_systab.con_out = systab32->con_out; | |
522 | efi_systab.stderr_handle = systab32->stderr_handle; | |
523 | efi_systab.stderr = systab32->stderr; | |
524 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
525 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
526 | efi_systab.nr_tables = systab32->nr_tables; | |
527 | efi_systab.tables = systab32->tables; | |
528 | ||
529 | early_iounmap(systab32, sizeof(*systab32)); | |
140bf275 | 530 | } |
1adbfa35 | 531 | |
5b83683f HY |
532 | efi.systab = &efi_systab; |
533 | ||
534 | /* | |
535 | * Verify the EFI Table | |
536 | */ | |
140bf275 | 537 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 538 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
539 | return -EINVAL; |
540 | } | |
5b83683f | 541 | if ((efi.systab->hdr.revision >> 16) == 0) |
e3cb3f5a | 542 | pr_err("Warning: System table version " |
5b83683f HY |
543 | "%d.%02d, expected 1.00 or greater!\n", |
544 | efi.systab->hdr.revision >> 16, | |
545 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
546 | |
547 | return 0; | |
83e7ee66 | 548 | } |
5b83683f | 549 | |
140bf275 | 550 | static int __init efi_config_init(u64 tables, int nr_tables) |
83e7ee66 | 551 | { |
1adbfa35 OJ |
552 | void *config_tables, *tablep; |
553 | int i, sz; | |
554 | ||
555 | if (efi_64bit) | |
556 | sz = sizeof(efi_config_table_64_t); | |
557 | else | |
558 | sz = sizeof(efi_config_table_32_t); | |
5b83683f HY |
559 | |
560 | /* | |
561 | * Let's see what config tables the firmware passed to us. | |
562 | */ | |
1adbfa35 | 563 | config_tables = early_ioremap(tables, nr_tables * sz); |
140bf275 | 564 | if (config_tables == NULL) { |
e3cb3f5a | 565 | pr_err("Could not map Configuration table!\n"); |
140bf275 OJ |
566 | return -ENOMEM; |
567 | } | |
5b83683f | 568 | |
1adbfa35 | 569 | tablep = config_tables; |
e3cb3f5a | 570 | pr_info(""); |
5b83683f | 571 | for (i = 0; i < efi.systab->nr_tables; i++) { |
1adbfa35 OJ |
572 | efi_guid_t guid; |
573 | unsigned long table; | |
574 | ||
575 | if (efi_64bit) { | |
576 | u64 table64; | |
577 | guid = ((efi_config_table_64_t *)tablep)->guid; | |
578 | table64 = ((efi_config_table_64_t *)tablep)->table; | |
579 | table = table64; | |
580 | #ifdef CONFIG_X86_32 | |
581 | if (table64 >> 32) { | |
582 | pr_cont("\n"); | |
583 | pr_err("Table located above 4GB, disabling EFI.\n"); | |
584 | early_iounmap(config_tables, | |
585 | efi.systab->nr_tables * sz); | |
586 | return -EINVAL; | |
587 | } | |
588 | #endif | |
589 | } else { | |
590 | guid = ((efi_config_table_32_t *)tablep)->guid; | |
591 | table = ((efi_config_table_32_t *)tablep)->table; | |
592 | } | |
a6a46f41 OJ |
593 | if (!efi_guidcmp(guid, MPS_TABLE_GUID)) { |
594 | efi.mps = table; | |
595 | pr_cont(" MPS=0x%lx ", table); | |
596 | } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) { | |
597 | efi.acpi20 = table; | |
598 | pr_cont(" ACPI 2.0=0x%lx ", table); | |
599 | } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) { | |
600 | efi.acpi = table; | |
601 | pr_cont(" ACPI=0x%lx ", table); | |
602 | } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) { | |
603 | efi.smbios = table; | |
604 | pr_cont(" SMBIOS=0x%lx ", table); | |
03b48632 | 605 | #ifdef CONFIG_X86_UV |
a6a46f41 OJ |
606 | } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) { |
607 | efi.uv_systab = table; | |
608 | pr_cont(" UVsystab=0x%lx ", table); | |
03b48632 | 609 | #endif |
a6a46f41 OJ |
610 | } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) { |
611 | efi.hcdp = table; | |
612 | pr_cont(" HCDP=0x%lx ", table); | |
613 | } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) { | |
614 | efi.uga = table; | |
615 | pr_cont(" UGA=0x%lx ", table); | |
5b83683f | 616 | } |
1adbfa35 | 617 | tablep += sz; |
5b83683f | 618 | } |
e3cb3f5a | 619 | pr_cont("\n"); |
a6a46f41 | 620 | early_iounmap(config_tables, efi.systab->nr_tables * sz); |
140bf275 | 621 | return 0; |
83e7ee66 OJ |
622 | } |
623 | ||
140bf275 | 624 | static int __init efi_runtime_init(void) |
83e7ee66 OJ |
625 | { |
626 | efi_runtime_services_t *runtime; | |
5b83683f HY |
627 | |
628 | /* | |
629 | * Check out the runtime services table. We need to map | |
630 | * the runtime services table so that we can grab the physical | |
631 | * address of several of the EFI runtime functions, needed to | |
632 | * set the firmware into virtual mode. | |
633 | */ | |
beacfaac HY |
634 | runtime = early_ioremap((unsigned long)efi.systab->runtime, |
635 | sizeof(efi_runtime_services_t)); | |
140bf275 | 636 | if (!runtime) { |
e3cb3f5a | 637 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
638 | return -ENOMEM; |
639 | } | |
640 | /* | |
641 | * We will only need *early* access to the following | |
11520e5e | 642 | * two EFI runtime services before set_virtual_address_map |
140bf275 OJ |
643 | * is invoked. |
644 | */ | |
11520e5e | 645 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; |
140bf275 OJ |
646 | efi_phys.set_virtual_address_map = |
647 | (efi_set_virtual_address_map_t *) | |
648 | runtime->set_virtual_address_map; | |
11520e5e LT |
649 | /* |
650 | * Make efi_get_time can be called before entering | |
651 | * virtual mode. | |
652 | */ | |
653 | efi.get_time = phys_efi_get_time; | |
beacfaac | 654 | early_iounmap(runtime, sizeof(efi_runtime_services_t)); |
140bf275 OJ |
655 | |
656 | return 0; | |
83e7ee66 | 657 | } |
5b83683f | 658 | |
140bf275 | 659 | static int __init efi_memmap_init(void) |
83e7ee66 | 660 | { |
5b83683f | 661 | /* Map the EFI memory map */ |
beacfaac HY |
662 | memmap.map = early_ioremap((unsigned long)memmap.phys_map, |
663 | memmap.nr_map * memmap.desc_size); | |
140bf275 | 664 | if (memmap.map == NULL) { |
e3cb3f5a | 665 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
666 | return -ENOMEM; |
667 | } | |
5b83683f | 668 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 669 | |
200001eb PJ |
670 | if (add_efi_memmap) |
671 | do_add_efi_memmap(); | |
140bf275 OJ |
672 | |
673 | return 0; | |
83e7ee66 OJ |
674 | } |
675 | ||
676 | void __init efi_init(void) | |
677 | { | |
678 | efi_char16_t *c16; | |
679 | char vendor[100] = "unknown"; | |
680 | int i = 0; | |
681 | void *tmp; | |
682 | ||
683 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
684 | if (boot_params.efi_info.efi_systab_hi || |
685 | boot_params.efi_info.efi_memmap_hi) { | |
686 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
687 | efi_enabled = 0; | |
688 | return; | |
689 | } | |
83e7ee66 OJ |
690 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
691 | #else | |
692 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
693 | (boot_params.efi_info.efi_systab | |
694 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
695 | #endif |
696 | ||
140bf275 OJ |
697 | if (efi_systab_init(efi_phys.systab)) { |
698 | efi_enabled = 0; | |
699 | return; | |
700 | } | |
83e7ee66 OJ |
701 | |
702 | /* | |
703 | * Show what we know for posterity | |
704 | */ | |
705 | c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); | |
706 | if (c16) { | |
707 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
708 | vendor[i] = *c16++; | |
709 | vendor[i] = '\0'; | |
710 | } else | |
e3cb3f5a | 711 | pr_err("Could not map the firmware vendor!\n"); |
83e7ee66 OJ |
712 | early_iounmap(tmp, 2); |
713 | ||
e3cb3f5a OJ |
714 | pr_info("EFI v%u.%.02u by %s\n", |
715 | efi.systab->hdr.revision >> 16, | |
716 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 717 | |
140bf275 OJ |
718 | if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) { |
719 | efi_enabled = 0; | |
720 | return; | |
721 | } | |
83e7ee66 | 722 | |
1adbfa35 OJ |
723 | /* |
724 | * Note: We currently don't support runtime services on an EFI | |
725 | * that doesn't match the kernel 32/64-bit mode. | |
726 | */ | |
727 | ||
5189c2a7 | 728 | if (!efi_is_native()) |
1adbfa35 OJ |
729 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
730 | else if (efi_runtime_init()) { | |
140bf275 OJ |
731 | efi_enabled = 0; |
732 | return; | |
733 | } | |
83e7ee66 | 734 | |
140bf275 OJ |
735 | if (efi_memmap_init()) { |
736 | efi_enabled = 0; | |
737 | return; | |
738 | } | |
11520e5e | 739 | #ifdef CONFIG_X86_32 |
5189c2a7 | 740 | if (efi_is_native()) { |
1adbfa35 OJ |
741 | x86_platform.get_wallclock = efi_get_time; |
742 | x86_platform.set_wallclock = efi_set_rtc_mmss; | |
743 | } | |
11520e5e | 744 | #endif |
7bd867df | 745 | |
5b83683f HY |
746 | #if EFI_DEBUG |
747 | print_efi_memmap(); | |
748 | #endif | |
749 | } | |
750 | ||
2223af38 JT |
751 | void __init efi_late_init(void) |
752 | { | |
753 | efi_bgrt_init(); | |
754 | } | |
755 | ||
9cd2b07c MG |
756 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
757 | { | |
758 | u64 addr, npages; | |
759 | ||
760 | addr = md->virt_addr; | |
761 | npages = md->num_pages; | |
762 | ||
763 | memrange_efi_to_native(&addr, &npages); | |
764 | ||
765 | if (executable) | |
766 | set_memory_x(addr, npages); | |
767 | else | |
768 | set_memory_nx(addr, npages); | |
769 | } | |
770 | ||
a2172e25 HY |
771 | static void __init runtime_code_page_mkexec(void) |
772 | { | |
773 | efi_memory_desc_t *md; | |
a2172e25 HY |
774 | void *p; |
775 | ||
a2172e25 HY |
776 | /* Make EFI runtime service code area executable */ |
777 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
778 | md = p; | |
1c083eb2 HY |
779 | |
780 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
781 | continue; | |
782 | ||
9cd2b07c | 783 | efi_set_executable(md, true); |
a2172e25 | 784 | } |
a2172e25 | 785 | } |
a2172e25 | 786 | |
7bc90e01 JT |
787 | /* |
788 | * We can't ioremap data in EFI boot services RAM, because we've already mapped | |
789 | * it as RAM. So, look it up in the existing EFI memory map instead. Only | |
790 | * callable after efi_enter_virtual_mode and before efi_free_boot_services. | |
791 | */ | |
792 | void __iomem *efi_lookup_mapped_addr(u64 phys_addr) | |
793 | { | |
794 | void *p; | |
795 | if (WARN_ON(!memmap.map)) | |
796 | return NULL; | |
797 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
798 | efi_memory_desc_t *md = p; | |
799 | u64 size = md->num_pages << EFI_PAGE_SHIFT; | |
800 | u64 end = md->phys_addr + size; | |
801 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && | |
802 | md->type != EFI_BOOT_SERVICES_CODE && | |
803 | md->type != EFI_BOOT_SERVICES_DATA) | |
804 | continue; | |
805 | if (!md->virt_addr) | |
806 | continue; | |
807 | if (phys_addr >= md->phys_addr && phys_addr < end) { | |
808 | phys_addr += md->virt_addr - md->phys_addr; | |
809 | return (__force void __iomem *)(unsigned long)phys_addr; | |
810 | } | |
811 | } | |
812 | return NULL; | |
813 | } | |
814 | ||
3e8fa263 MF |
815 | void efi_memory_uc(u64 addr, unsigned long size) |
816 | { | |
817 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
818 | u64 npages; | |
819 | ||
820 | npages = round_up(size, page_shift) / page_shift; | |
821 | memrange_efi_to_native(&addr, &npages); | |
822 | set_memory_uc(addr, npages); | |
823 | } | |
824 | ||
5b83683f HY |
825 | /* |
826 | * This function will switch the EFI runtime services to virtual mode. | |
827 | * Essentially, look through the EFI memmap and map every region that | |
828 | * has the runtime attribute bit set in its memory descriptor and update | |
829 | * that memory descriptor with the virtual address obtained from ioremap(). | |
830 | * This enables the runtime services to be called without having to | |
831 | * thunk back into physical mode for every invocation. | |
832 | */ | |
833 | void __init efi_enter_virtual_mode(void) | |
834 | { | |
202f9d0a | 835 | efi_memory_desc_t *md, *prev_md = NULL; |
5b83683f | 836 | efi_status_t status; |
1c083eb2 | 837 | unsigned long size; |
3e8fa263 | 838 | u64 end, systab, end_pfn; |
7cb00b72 MG |
839 | void *p, *va, *new_memmap = NULL; |
840 | int count = 0; | |
5b83683f HY |
841 | |
842 | efi.systab = NULL; | |
202f9d0a | 843 | |
1adbfa35 OJ |
844 | /* |
845 | * We don't do virtual mode, since we don't do runtime services, on | |
846 | * non-native EFI | |
847 | */ | |
848 | ||
5189c2a7 | 849 | if (!efi_is_native()) { |
78510792 JT |
850 | efi_unmap_memmap(); |
851 | return; | |
852 | } | |
1adbfa35 | 853 | |
202f9d0a MG |
854 | /* Merge contiguous regions of the same type and attribute */ |
855 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
856 | u64 prev_size; | |
857 | md = p; | |
858 | ||
859 | if (!prev_md) { | |
860 | prev_md = md; | |
861 | continue; | |
862 | } | |
863 | ||
864 | if (prev_md->type != md->type || | |
865 | prev_md->attribute != md->attribute) { | |
866 | prev_md = md; | |
867 | continue; | |
868 | } | |
869 | ||
870 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
871 | ||
872 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
873 | prev_md->num_pages += md->num_pages; | |
874 | md->type = EFI_RESERVED_TYPE; | |
875 | md->attribute = 0; | |
876 | continue; | |
877 | } | |
878 | prev_md = md; | |
879 | } | |
880 | ||
5b83683f HY |
881 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
882 | md = p; | |
916f676f MG |
883 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && |
884 | md->type != EFI_BOOT_SERVICES_CODE && | |
885 | md->type != EFI_BOOT_SERVICES_DATA) | |
5b83683f | 886 | continue; |
1c083eb2 HY |
887 | |
888 | size = md->num_pages << EFI_PAGE_SHIFT; | |
889 | end = md->phys_addr + size; | |
890 | ||
dd39ecf5 HY |
891 | end_pfn = PFN_UP(end); |
892 | if (end_pfn <= max_low_pfn_mapped | |
893 | || (end_pfn > (1UL << (32 - PAGE_SHIFT)) | |
3e8fa263 | 894 | && end_pfn <= max_pfn_mapped)) { |
1c083eb2 | 895 | va = __va(md->phys_addr); |
3e8fa263 MF |
896 | |
897 | if (!(md->attribute & EFI_MEMORY_WB)) | |
898 | efi_memory_uc((u64)(unsigned long)va, size); | |
899 | } else | |
900 | va = efi_ioremap(md->phys_addr, size, | |
901 | md->type, md->attribute); | |
1c083eb2 | 902 | |
1c083eb2 HY |
903 | md->virt_addr = (u64) (unsigned long) va; |
904 | ||
905 | if (!va) { | |
e3cb3f5a | 906 | pr_err("ioremap of 0x%llX failed!\n", |
5b83683f | 907 | (unsigned long long)md->phys_addr); |
1c083eb2 HY |
908 | continue; |
909 | } | |
910 | ||
911 | systab = (u64) (unsigned long) efi_phys.systab; | |
912 | if (md->phys_addr <= systab && systab < end) { | |
913 | systab += md->virt_addr - md->phys_addr; | |
914 | efi.systab = (efi_system_table_t *) (unsigned long) systab; | |
915 | } | |
7cb00b72 MG |
916 | new_memmap = krealloc(new_memmap, |
917 | (count + 1) * memmap.desc_size, | |
918 | GFP_KERNEL); | |
919 | memcpy(new_memmap + (count * memmap.desc_size), md, | |
920 | memmap.desc_size); | |
921 | count++; | |
5b83683f HY |
922 | } |
923 | ||
924 | BUG_ON(!efi.systab); | |
925 | ||
926 | status = phys_efi_set_virtual_address_map( | |
7cb00b72 | 927 | memmap.desc_size * count, |
5b83683f HY |
928 | memmap.desc_size, |
929 | memmap.desc_version, | |
7cb00b72 | 930 | (efi_memory_desc_t *)__pa(new_memmap)); |
5b83683f HY |
931 | |
932 | if (status != EFI_SUCCESS) { | |
e3cb3f5a OJ |
933 | pr_alert("Unable to switch EFI into virtual mode " |
934 | "(status=%lx)!\n", status); | |
5b83683f HY |
935 | panic("EFI call to SetVirtualAddressMap() failed!"); |
936 | } | |
937 | ||
938 | /* | |
939 | * Now that EFI is in virtual mode, update the function | |
940 | * pointers in the runtime service table to the new virtual addresses. | |
941 | * | |
942 | * Call EFI services through wrapper functions. | |
943 | */ | |
d6cf86d8 | 944 | efi.runtime_version = efi_systab.fw_revision; |
5b83683f HY |
945 | efi.get_time = virt_efi_get_time; |
946 | efi.set_time = virt_efi_set_time; | |
947 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
948 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
949 | efi.get_variable = virt_efi_get_variable; | |
950 | efi.get_next_variable = virt_efi_get_next_variable; | |
951 | efi.set_variable = virt_efi_set_variable; | |
952 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
953 | efi.reset_system = virt_efi_reset_system; | |
2b5e8ef3 | 954 | efi.set_virtual_address_map = NULL; |
3b370237 MG |
955 | efi.query_variable_info = virt_efi_query_variable_info; |
956 | efi.update_capsule = virt_efi_update_capsule; | |
957 | efi.query_capsule_caps = virt_efi_query_capsule_caps; | |
4de0d4a6 HY |
958 | if (__supported_pte_mask & _PAGE_NX) |
959 | runtime_code_page_mkexec(); | |
1adbfa35 | 960 | |
7cb00b72 | 961 | kfree(new_memmap); |
5b83683f HY |
962 | } |
963 | ||
964 | /* | |
965 | * Convenience functions to obtain memory types and attributes | |
966 | */ | |
967 | u32 efi_mem_type(unsigned long phys_addr) | |
968 | { | |
969 | efi_memory_desc_t *md; | |
970 | void *p; | |
971 | ||
972 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
973 | md = p; | |
974 | if ((md->phys_addr <= phys_addr) && | |
975 | (phys_addr < (md->phys_addr + | |
976 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
977 | return md->type; | |
978 | } | |
979 | return 0; | |
980 | } | |
981 | ||
982 | u64 efi_mem_attributes(unsigned long phys_addr) | |
983 | { | |
984 | efi_memory_desc_t *md; | |
985 | void *p; | |
986 | ||
987 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
988 | md = p; | |
989 | if ((md->phys_addr <= phys_addr) && | |
990 | (phys_addr < (md->phys_addr + | |
991 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
992 | return md->attribute; | |
993 | } | |
994 | return 0; | |
995 | } |