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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 | ||
29 | #include <linux/kernel.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/efi.h> | |
32 | #include <linux/bootmem.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/uaccess.h> | |
35 | #include <linux/time.h> | |
36 | #include <linux/io.h> | |
37 | #include <linux/reboot.h> | |
38 | #include <linux/bcd.h> | |
39 | ||
40 | #include <asm/setup.h> | |
41 | #include <asm/efi.h> | |
42 | #include <asm/time.h> | |
43 | ||
44 | #define EFI_DEBUG 1 | |
45 | #define PFX "EFI: " | |
46 | ||
47 | int efi_enabled; | |
48 | EXPORT_SYMBOL(efi_enabled); | |
49 | ||
50 | struct efi efi; | |
51 | EXPORT_SYMBOL(efi); | |
52 | ||
53 | struct efi_memory_map memmap; | |
54 | ||
55 | struct efi efi_phys __initdata; | |
56 | static efi_system_table_t efi_systab __initdata; | |
57 | ||
58 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) | |
59 | { | |
60 | return efi_call_virt2(get_time, tm, tc); | |
61 | } | |
62 | ||
63 | static efi_status_t virt_efi_set_time(efi_time_t *tm) | |
64 | { | |
65 | return efi_call_virt1(set_time, tm); | |
66 | } | |
67 | ||
68 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, | |
69 | efi_bool_t *pending, | |
70 | efi_time_t *tm) | |
71 | { | |
72 | return efi_call_virt3(get_wakeup_time, | |
73 | enabled, pending, tm); | |
74 | } | |
75 | ||
76 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
77 | { | |
78 | return efi_call_virt2(set_wakeup_time, | |
79 | enabled, tm); | |
80 | } | |
81 | ||
82 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, | |
83 | efi_guid_t *vendor, | |
84 | u32 *attr, | |
85 | unsigned long *data_size, | |
86 | void *data) | |
87 | { | |
88 | return efi_call_virt5(get_variable, | |
89 | name, vendor, attr, | |
90 | data_size, data); | |
91 | } | |
92 | ||
93 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, | |
94 | efi_char16_t *name, | |
95 | efi_guid_t *vendor) | |
96 | { | |
97 | return efi_call_virt3(get_next_variable, | |
98 | name_size, name, vendor); | |
99 | } | |
100 | ||
101 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, | |
102 | efi_guid_t *vendor, | |
103 | unsigned long attr, | |
104 | unsigned long data_size, | |
105 | void *data) | |
106 | { | |
107 | return efi_call_virt5(set_variable, | |
108 | name, vendor, attr, | |
109 | data_size, data); | |
110 | } | |
111 | ||
112 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) | |
113 | { | |
114 | return efi_call_virt1(get_next_high_mono_count, count); | |
115 | } | |
116 | ||
117 | static void virt_efi_reset_system(int reset_type, | |
118 | efi_status_t status, | |
119 | unsigned long data_size, | |
120 | efi_char16_t *data) | |
121 | { | |
122 | efi_call_virt4(reset_system, reset_type, status, | |
123 | data_size, data); | |
124 | } | |
125 | ||
126 | static efi_status_t virt_efi_set_virtual_address_map( | |
127 | unsigned long memory_map_size, | |
128 | unsigned long descriptor_size, | |
129 | u32 descriptor_version, | |
130 | efi_memory_desc_t *virtual_map) | |
131 | { | |
132 | return efi_call_virt4(set_virtual_address_map, | |
133 | memory_map_size, descriptor_size, | |
134 | descriptor_version, virtual_map); | |
135 | } | |
136 | ||
137 | static efi_status_t __init phys_efi_set_virtual_address_map( | |
138 | unsigned long memory_map_size, | |
139 | unsigned long descriptor_size, | |
140 | u32 descriptor_version, | |
141 | efi_memory_desc_t *virtual_map) | |
142 | { | |
143 | efi_status_t status; | |
144 | ||
145 | efi_call_phys_prelog(); | |
146 | status = efi_call_phys4(efi_phys.set_virtual_address_map, | |
147 | memory_map_size, descriptor_size, | |
148 | descriptor_version, virtual_map); | |
149 | efi_call_phys_epilog(); | |
150 | return status; | |
151 | } | |
152 | ||
153 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, | |
154 | efi_time_cap_t *tc) | |
155 | { | |
156 | efi_status_t status; | |
157 | ||
158 | efi_call_phys_prelog(); | |
159 | status = efi_call_phys2(efi_phys.get_time, tm, tc); | |
160 | efi_call_phys_epilog(); | |
161 | return status; | |
162 | } | |
163 | ||
164 | int efi_set_rtc_mmss(unsigned long nowtime) | |
165 | { | |
166 | int real_seconds, real_minutes; | |
167 | efi_status_t status; | |
168 | efi_time_t eft; | |
169 | efi_time_cap_t cap; | |
170 | ||
171 | status = efi.get_time(&eft, &cap); | |
172 | if (status != EFI_SUCCESS) { | |
173 | printk(KERN_ERR "Oops: efitime: can't read time!\n"); | |
174 | return -1; | |
175 | } | |
176 | ||
177 | real_seconds = nowtime % 60; | |
178 | real_minutes = nowtime / 60; | |
179 | if (((abs(real_minutes - eft.minute) + 15)/30) & 1) | |
180 | real_minutes += 30; | |
181 | real_minutes %= 60; | |
182 | eft.minute = real_minutes; | |
183 | eft.second = real_seconds; | |
184 | ||
185 | status = efi.set_time(&eft); | |
186 | if (status != EFI_SUCCESS) { | |
187 | printk(KERN_ERR "Oops: efitime: can't write time!\n"); | |
188 | return -1; | |
189 | } | |
190 | return 0; | |
191 | } | |
192 | ||
193 | unsigned long efi_get_time(void) | |
194 | { | |
195 | efi_status_t status; | |
196 | efi_time_t eft; | |
197 | efi_time_cap_t cap; | |
198 | ||
199 | status = efi.get_time(&eft, &cap); | |
200 | if (status != EFI_SUCCESS) | |
201 | printk(KERN_ERR "Oops: efitime: can't read time!\n"); | |
202 | ||
203 | return mktime(eft.year, eft.month, eft.day, eft.hour, | |
204 | eft.minute, eft.second); | |
205 | } | |
206 | ||
207 | #if EFI_DEBUG | |
208 | static void __init print_efi_memmap(void) | |
209 | { | |
210 | efi_memory_desc_t *md; | |
211 | void *p; | |
212 | int i; | |
213 | ||
214 | for (p = memmap.map, i = 0; | |
215 | p < memmap.map_end; | |
216 | p += memmap.desc_size, i++) { | |
217 | md = p; | |
218 | printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, " | |
219 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", | |
220 | i, md->type, md->attribute, md->phys_addr, | |
221 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
222 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
223 | } | |
224 | } | |
225 | #endif /* EFI_DEBUG */ | |
226 | ||
227 | void __init efi_init(void) | |
228 | { | |
229 | efi_config_table_t *config_tables; | |
230 | efi_runtime_services_t *runtime; | |
231 | efi_char16_t *c16; | |
232 | char vendor[100] = "unknown"; | |
233 | int i = 0; | |
234 | void *tmp; | |
235 | ||
236 | #ifdef CONFIG_X86_32 | |
237 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; | |
238 | memmap.phys_map = (void *)boot_params.efi_info.efi_memmap; | |
239 | #else | |
240 | efi_phys.systab = (efi_system_table_t *) | |
241 | (boot_params.efi_info.efi_systab | | |
242 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
243 | memmap.phys_map = (void *) | |
244 | (boot_params.efi_info.efi_memmap | | |
245 | ((__u64)boot_params.efi_info.efi_memmap_hi<<32)); | |
246 | #endif | |
247 | memmap.nr_map = boot_params.efi_info.efi_memmap_size / | |
248 | boot_params.efi_info.efi_memdesc_size; | |
249 | memmap.desc_version = boot_params.efi_info.efi_memdesc_version; | |
250 | memmap.desc_size = boot_params.efi_info.efi_memdesc_size; | |
251 | ||
252 | efi.systab = efi_early_ioremap((unsigned long)efi_phys.systab, | |
253 | sizeof(efi_system_table_t)); | |
254 | if (efi.systab == NULL) | |
255 | printk(KERN_ERR "Couldn't map the EFI system table!\n"); | |
256 | memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t)); | |
257 | efi_early_iounmap(efi.systab, sizeof(efi_system_table_t)); | |
258 | efi.systab = &efi_systab; | |
259 | ||
260 | /* | |
261 | * Verify the EFI Table | |
262 | */ | |
263 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) | |
264 | printk(KERN_ERR "EFI system table signature incorrect!\n"); | |
265 | if ((efi.systab->hdr.revision >> 16) == 0) | |
266 | printk(KERN_ERR "Warning: EFI system table version " | |
267 | "%d.%02d, expected 1.00 or greater!\n", | |
268 | efi.systab->hdr.revision >> 16, | |
269 | efi.systab->hdr.revision & 0xffff); | |
270 | ||
271 | /* | |
272 | * Show what we know for posterity | |
273 | */ | |
274 | c16 = tmp = efi_early_ioremap(efi.systab->fw_vendor, 2); | |
275 | if (c16) { | |
276 | for (i = 0; i < sizeof(vendor) && *c16; ++i) | |
277 | vendor[i] = *c16++; | |
278 | vendor[i] = '\0'; | |
279 | } else | |
280 | printk(KERN_ERR PFX "Could not map the firmware vendor!\n"); | |
281 | efi_early_iounmap(tmp, 2); | |
282 | ||
283 | printk(KERN_INFO "EFI v%u.%.02u by %s \n", | |
284 | efi.systab->hdr.revision >> 16, | |
285 | efi.systab->hdr.revision & 0xffff, vendor); | |
286 | ||
287 | /* | |
288 | * Let's see what config tables the firmware passed to us. | |
289 | */ | |
290 | config_tables = efi_early_ioremap( | |
291 | efi.systab->tables, | |
292 | efi.systab->nr_tables * sizeof(efi_config_table_t)); | |
293 | if (config_tables == NULL) | |
294 | printk(KERN_ERR "Could not map EFI Configuration Table!\n"); | |
295 | ||
296 | printk(KERN_INFO); | |
297 | for (i = 0; i < efi.systab->nr_tables; i++) { | |
298 | if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) { | |
299 | efi.mps = config_tables[i].table; | |
300 | printk(" MPS=0x%lx ", config_tables[i].table); | |
301 | } else if (!efi_guidcmp(config_tables[i].guid, | |
302 | ACPI_20_TABLE_GUID)) { | |
303 | efi.acpi20 = config_tables[i].table; | |
304 | printk(" ACPI 2.0=0x%lx ", config_tables[i].table); | |
305 | } else if (!efi_guidcmp(config_tables[i].guid, | |
306 | ACPI_TABLE_GUID)) { | |
307 | efi.acpi = config_tables[i].table; | |
308 | printk(" ACPI=0x%lx ", config_tables[i].table); | |
309 | } else if (!efi_guidcmp(config_tables[i].guid, | |
310 | SMBIOS_TABLE_GUID)) { | |
311 | efi.smbios = config_tables[i].table; | |
312 | printk(" SMBIOS=0x%lx ", config_tables[i].table); | |
313 | } else if (!efi_guidcmp(config_tables[i].guid, | |
314 | HCDP_TABLE_GUID)) { | |
315 | efi.hcdp = config_tables[i].table; | |
316 | printk(" HCDP=0x%lx ", config_tables[i].table); | |
317 | } else if (!efi_guidcmp(config_tables[i].guid, | |
318 | UGA_IO_PROTOCOL_GUID)) { | |
319 | efi.uga = config_tables[i].table; | |
320 | printk(" UGA=0x%lx ", config_tables[i].table); | |
321 | } | |
322 | } | |
323 | printk("\n"); | |
324 | efi_early_iounmap(config_tables, | |
325 | efi.systab->nr_tables * sizeof(efi_config_table_t)); | |
326 | ||
327 | /* | |
328 | * Check out the runtime services table. We need to map | |
329 | * the runtime services table so that we can grab the physical | |
330 | * address of several of the EFI runtime functions, needed to | |
331 | * set the firmware into virtual mode. | |
332 | */ | |
333 | runtime = efi_early_ioremap((unsigned long)efi.systab->runtime, | |
334 | sizeof(efi_runtime_services_t)); | |
335 | if (runtime != NULL) { | |
336 | /* | |
337 | * We will only need *early* access to the following | |
338 | * two EFI runtime services before set_virtual_address_map | |
339 | * is invoked. | |
340 | */ | |
341 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; | |
342 | efi_phys.set_virtual_address_map = | |
343 | (efi_set_virtual_address_map_t *) | |
344 | runtime->set_virtual_address_map; | |
345 | /* | |
346 | * Make efi_get_time can be called before entering | |
347 | * virtual mode. | |
348 | */ | |
349 | efi.get_time = phys_efi_get_time; | |
350 | } else | |
351 | printk(KERN_ERR "Could not map the EFI runtime service " | |
352 | "table!\n"); | |
353 | efi_early_iounmap(runtime, sizeof(efi_runtime_services_t)); | |
354 | ||
355 | /* Map the EFI memory map */ | |
356 | memmap.map = efi_early_ioremap((unsigned long)memmap.phys_map, | |
357 | memmap.nr_map * memmap.desc_size); | |
358 | if (memmap.map == NULL) | |
359 | printk(KERN_ERR "Could not map the EFI memory map!\n"); | |
360 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); | |
361 | if (memmap.desc_size != sizeof(efi_memory_desc_t)) | |
362 | printk(KERN_WARNING "Kernel-defined memdesc" | |
363 | "doesn't match the one from EFI!\n"); | |
364 | ||
365 | #ifdef CONFIG_X86_64 | |
366 | /* Setup for EFI runtime service */ | |
367 | reboot_type = BOOT_EFI; | |
368 | ||
369 | #endif | |
370 | #if EFI_DEBUG | |
371 | print_efi_memmap(); | |
372 | #endif | |
373 | } | |
374 | ||
375 | /* | |
376 | * This function will switch the EFI runtime services to virtual mode. | |
377 | * Essentially, look through the EFI memmap and map every region that | |
378 | * has the runtime attribute bit set in its memory descriptor and update | |
379 | * that memory descriptor with the virtual address obtained from ioremap(). | |
380 | * This enables the runtime services to be called without having to | |
381 | * thunk back into physical mode for every invocation. | |
382 | */ | |
383 | void __init efi_enter_virtual_mode(void) | |
384 | { | |
385 | efi_memory_desc_t *md; | |
386 | efi_status_t status; | |
387 | unsigned long end; | |
388 | void *p; | |
389 | ||
390 | efi.systab = NULL; | |
391 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
392 | md = p; | |
393 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) | |
394 | continue; | |
395 | if ((md->attribute & EFI_MEMORY_WB) && | |
396 | (((md->phys_addr + (md->num_pages<<EFI_PAGE_SHIFT)) >> | |
397 | PAGE_SHIFT) < end_pfn_map)) | |
398 | md->virt_addr = (unsigned long)__va(md->phys_addr); | |
399 | else | |
400 | md->virt_addr = (unsigned long) | |
401 | efi_ioremap(md->phys_addr, | |
402 | md->num_pages << EFI_PAGE_SHIFT); | |
403 | if (!md->virt_addr) | |
404 | printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n", | |
405 | (unsigned long long)md->phys_addr); | |
406 | end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT); | |
407 | if ((md->phys_addr <= (unsigned long)efi_phys.systab) && | |
408 | ((unsigned long)efi_phys.systab < end)) | |
409 | efi.systab = (efi_system_table_t *)(unsigned long) | |
410 | (md->virt_addr - md->phys_addr + | |
411 | (unsigned long)efi_phys.systab); | |
412 | } | |
413 | ||
414 | BUG_ON(!efi.systab); | |
415 | ||
416 | status = phys_efi_set_virtual_address_map( | |
417 | memmap.desc_size * memmap.nr_map, | |
418 | memmap.desc_size, | |
419 | memmap.desc_version, | |
420 | memmap.phys_map); | |
421 | ||
422 | if (status != EFI_SUCCESS) { | |
423 | printk(KERN_ALERT "Unable to switch EFI into virtual mode " | |
424 | "(status=%lx)!\n", status); | |
425 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
426 | } | |
427 | ||
428 | /* | |
429 | * Now that EFI is in virtual mode, update the function | |
430 | * pointers in the runtime service table to the new virtual addresses. | |
431 | * | |
432 | * Call EFI services through wrapper functions. | |
433 | */ | |
434 | efi.get_time = virt_efi_get_time; | |
435 | efi.set_time = virt_efi_set_time; | |
436 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
437 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
438 | efi.get_variable = virt_efi_get_variable; | |
439 | efi.get_next_variable = virt_efi_get_next_variable; | |
440 | efi.set_variable = virt_efi_set_variable; | |
441 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
442 | efi.reset_system = virt_efi_reset_system; | |
443 | efi.set_virtual_address_map = virt_efi_set_virtual_address_map; | |
444 | #ifdef CONFIG_X86_64 | |
445 | runtime_code_page_mkexec(); | |
446 | #endif | |
447 | } | |
448 | ||
449 | /* | |
450 | * Convenience functions to obtain memory types and attributes | |
451 | */ | |
452 | u32 efi_mem_type(unsigned long phys_addr) | |
453 | { | |
454 | efi_memory_desc_t *md; | |
455 | void *p; | |
456 | ||
457 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
458 | md = p; | |
459 | if ((md->phys_addr <= phys_addr) && | |
460 | (phys_addr < (md->phys_addr + | |
461 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
462 | return md->type; | |
463 | } | |
464 | return 0; | |
465 | } | |
466 | ||
467 | u64 efi_mem_attributes(unsigned long phys_addr) | |
468 | { | |
469 | efi_memory_desc_t *md; | |
470 | void *p; | |
471 | ||
472 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
473 | md = p; | |
474 | if ((md->phys_addr <= phys_addr) && | |
475 | (phys_addr < (md->phys_addr + | |
476 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
477 | return md->attribute; | |
478 | } | |
479 | return 0; | |
480 | } |