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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 | ||
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> | |
a2172e25 HY |
43 | #include <asm/cacheflush.h> |
44 | #include <asm/tlbflush.h> | |
5b83683f HY |
45 | |
46 | #define EFI_DEBUG 1 | |
47 | #define PFX "EFI: " | |
48 | ||
49 | int efi_enabled; | |
50 | EXPORT_SYMBOL(efi_enabled); | |
51 | ||
52 | struct efi efi; | |
53 | EXPORT_SYMBOL(efi); | |
54 | ||
55 | struct efi_memory_map memmap; | |
56 | ||
57 | struct efi efi_phys __initdata; | |
58 | static efi_system_table_t efi_systab __initdata; | |
59 | ||
8b2cb7a8 HY |
60 | static int __init setup_noefi(char *arg) |
61 | { | |
62 | efi_enabled = 0; | |
63 | return 0; | |
64 | } | |
65 | early_param("noefi", setup_noefi); | |
66 | ||
5b83683f HY |
67 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
68 | { | |
69 | return efi_call_virt2(get_time, tm, tc); | |
70 | } | |
71 | ||
72 | static efi_status_t virt_efi_set_time(efi_time_t *tm) | |
73 | { | |
74 | return efi_call_virt1(set_time, tm); | |
75 | } | |
76 | ||
77 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, | |
78 | efi_bool_t *pending, | |
79 | efi_time_t *tm) | |
80 | { | |
81 | return efi_call_virt3(get_wakeup_time, | |
82 | enabled, pending, tm); | |
83 | } | |
84 | ||
85 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
86 | { | |
87 | return efi_call_virt2(set_wakeup_time, | |
88 | enabled, tm); | |
89 | } | |
90 | ||
91 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, | |
92 | efi_guid_t *vendor, | |
93 | u32 *attr, | |
94 | unsigned long *data_size, | |
95 | void *data) | |
96 | { | |
97 | return efi_call_virt5(get_variable, | |
98 | name, vendor, attr, | |
99 | data_size, data); | |
100 | } | |
101 | ||
102 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, | |
103 | efi_char16_t *name, | |
104 | efi_guid_t *vendor) | |
105 | { | |
106 | return efi_call_virt3(get_next_variable, | |
107 | name_size, name, vendor); | |
108 | } | |
109 | ||
110 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, | |
111 | efi_guid_t *vendor, | |
112 | unsigned long attr, | |
113 | unsigned long data_size, | |
114 | void *data) | |
115 | { | |
116 | return efi_call_virt5(set_variable, | |
117 | name, vendor, attr, | |
118 | data_size, data); | |
119 | } | |
120 | ||
121 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) | |
122 | { | |
123 | return efi_call_virt1(get_next_high_mono_count, count); | |
124 | } | |
125 | ||
126 | static void virt_efi_reset_system(int reset_type, | |
127 | efi_status_t status, | |
128 | unsigned long data_size, | |
129 | efi_char16_t *data) | |
130 | { | |
131 | efi_call_virt4(reset_system, reset_type, status, | |
132 | data_size, data); | |
133 | } | |
134 | ||
135 | static efi_status_t virt_efi_set_virtual_address_map( | |
136 | unsigned long memory_map_size, | |
137 | unsigned long descriptor_size, | |
138 | u32 descriptor_version, | |
139 | efi_memory_desc_t *virtual_map) | |
140 | { | |
141 | return efi_call_virt4(set_virtual_address_map, | |
142 | memory_map_size, descriptor_size, | |
143 | descriptor_version, virtual_map); | |
144 | } | |
145 | ||
146 | static efi_status_t __init phys_efi_set_virtual_address_map( | |
147 | unsigned long memory_map_size, | |
148 | unsigned long descriptor_size, | |
149 | u32 descriptor_version, | |
150 | efi_memory_desc_t *virtual_map) | |
151 | { | |
152 | efi_status_t status; | |
153 | ||
154 | efi_call_phys_prelog(); | |
155 | status = efi_call_phys4(efi_phys.set_virtual_address_map, | |
156 | memory_map_size, descriptor_size, | |
157 | descriptor_version, virtual_map); | |
158 | efi_call_phys_epilog(); | |
159 | return status; | |
160 | } | |
161 | ||
162 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, | |
163 | efi_time_cap_t *tc) | |
164 | { | |
165 | efi_status_t status; | |
166 | ||
167 | efi_call_phys_prelog(); | |
168 | status = efi_call_phys2(efi_phys.get_time, tm, tc); | |
169 | efi_call_phys_epilog(); | |
170 | return status; | |
171 | } | |
172 | ||
173 | int efi_set_rtc_mmss(unsigned long nowtime) | |
174 | { | |
175 | int real_seconds, real_minutes; | |
176 | efi_status_t status; | |
177 | efi_time_t eft; | |
178 | efi_time_cap_t cap; | |
179 | ||
180 | status = efi.get_time(&eft, &cap); | |
181 | if (status != EFI_SUCCESS) { | |
182 | printk(KERN_ERR "Oops: efitime: can't read time!\n"); | |
183 | return -1; | |
184 | } | |
185 | ||
186 | real_seconds = nowtime % 60; | |
187 | real_minutes = nowtime / 60; | |
188 | if (((abs(real_minutes - eft.minute) + 15)/30) & 1) | |
189 | real_minutes += 30; | |
190 | real_minutes %= 60; | |
191 | eft.minute = real_minutes; | |
192 | eft.second = real_seconds; | |
193 | ||
194 | status = efi.set_time(&eft); | |
195 | if (status != EFI_SUCCESS) { | |
196 | printk(KERN_ERR "Oops: efitime: can't write time!\n"); | |
197 | return -1; | |
198 | } | |
199 | return 0; | |
200 | } | |
201 | ||
202 | unsigned long efi_get_time(void) | |
203 | { | |
204 | efi_status_t status; | |
205 | efi_time_t eft; | |
206 | efi_time_cap_t cap; | |
207 | ||
208 | status = efi.get_time(&eft, &cap); | |
209 | if (status != EFI_SUCCESS) | |
210 | printk(KERN_ERR "Oops: efitime: can't read time!\n"); | |
211 | ||
212 | return mktime(eft.year, eft.month, eft.day, eft.hour, | |
213 | eft.minute, eft.second); | |
214 | } | |
215 | ||
216 | #if EFI_DEBUG | |
217 | static void __init print_efi_memmap(void) | |
218 | { | |
219 | efi_memory_desc_t *md; | |
220 | void *p; | |
221 | int i; | |
222 | ||
223 | for (p = memmap.map, i = 0; | |
224 | p < memmap.map_end; | |
225 | p += memmap.desc_size, i++) { | |
226 | md = p; | |
227 | printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, " | |
228 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", | |
229 | i, md->type, md->attribute, md->phys_addr, | |
230 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
231 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
232 | } | |
233 | } | |
234 | #endif /* EFI_DEBUG */ | |
235 | ||
236 | void __init efi_init(void) | |
237 | { | |
238 | efi_config_table_t *config_tables; | |
239 | efi_runtime_services_t *runtime; | |
240 | efi_char16_t *c16; | |
241 | char vendor[100] = "unknown"; | |
242 | int i = 0; | |
243 | void *tmp; | |
244 | ||
245 | #ifdef CONFIG_X86_32 | |
246 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; | |
247 | memmap.phys_map = (void *)boot_params.efi_info.efi_memmap; | |
248 | #else | |
249 | efi_phys.systab = (efi_system_table_t *) | |
250 | (boot_params.efi_info.efi_systab | | |
251 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
252 | memmap.phys_map = (void *) | |
253 | (boot_params.efi_info.efi_memmap | | |
254 | ((__u64)boot_params.efi_info.efi_memmap_hi<<32)); | |
255 | #endif | |
256 | memmap.nr_map = boot_params.efi_info.efi_memmap_size / | |
257 | boot_params.efi_info.efi_memdesc_size; | |
258 | memmap.desc_version = boot_params.efi_info.efi_memdesc_version; | |
259 | memmap.desc_size = boot_params.efi_info.efi_memdesc_size; | |
260 | ||
beacfaac HY |
261 | efi.systab = early_ioremap((unsigned long)efi_phys.systab, |
262 | sizeof(efi_system_table_t)); | |
5b83683f HY |
263 | if (efi.systab == NULL) |
264 | printk(KERN_ERR "Couldn't map the EFI system table!\n"); | |
265 | memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t)); | |
beacfaac | 266 | early_iounmap(efi.systab, sizeof(efi_system_table_t)); |
5b83683f HY |
267 | efi.systab = &efi_systab; |
268 | ||
269 | /* | |
270 | * Verify the EFI Table | |
271 | */ | |
272 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) | |
273 | printk(KERN_ERR "EFI system table signature incorrect!\n"); | |
274 | if ((efi.systab->hdr.revision >> 16) == 0) | |
275 | printk(KERN_ERR "Warning: EFI system table version " | |
276 | "%d.%02d, expected 1.00 or greater!\n", | |
277 | efi.systab->hdr.revision >> 16, | |
278 | efi.systab->hdr.revision & 0xffff); | |
279 | ||
280 | /* | |
281 | * Show what we know for posterity | |
282 | */ | |
beacfaac | 283 | c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); |
5b83683f HY |
284 | if (c16) { |
285 | for (i = 0; i < sizeof(vendor) && *c16; ++i) | |
286 | vendor[i] = *c16++; | |
287 | vendor[i] = '\0'; | |
288 | } else | |
289 | printk(KERN_ERR PFX "Could not map the firmware vendor!\n"); | |
beacfaac | 290 | early_iounmap(tmp, 2); |
5b83683f HY |
291 | |
292 | printk(KERN_INFO "EFI v%u.%.02u by %s \n", | |
293 | efi.systab->hdr.revision >> 16, | |
294 | efi.systab->hdr.revision & 0xffff, vendor); | |
295 | ||
296 | /* | |
297 | * Let's see what config tables the firmware passed to us. | |
298 | */ | |
beacfaac | 299 | config_tables = early_ioremap( |
5b83683f HY |
300 | efi.systab->tables, |
301 | efi.systab->nr_tables * sizeof(efi_config_table_t)); | |
302 | if (config_tables == NULL) | |
303 | printk(KERN_ERR "Could not map EFI Configuration Table!\n"); | |
304 | ||
305 | printk(KERN_INFO); | |
306 | for (i = 0; i < efi.systab->nr_tables; i++) { | |
307 | if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) { | |
308 | efi.mps = config_tables[i].table; | |
309 | printk(" MPS=0x%lx ", config_tables[i].table); | |
310 | } else if (!efi_guidcmp(config_tables[i].guid, | |
311 | ACPI_20_TABLE_GUID)) { | |
312 | efi.acpi20 = config_tables[i].table; | |
313 | printk(" ACPI 2.0=0x%lx ", config_tables[i].table); | |
314 | } else if (!efi_guidcmp(config_tables[i].guid, | |
315 | ACPI_TABLE_GUID)) { | |
316 | efi.acpi = config_tables[i].table; | |
317 | printk(" ACPI=0x%lx ", config_tables[i].table); | |
318 | } else if (!efi_guidcmp(config_tables[i].guid, | |
319 | SMBIOS_TABLE_GUID)) { | |
320 | efi.smbios = config_tables[i].table; | |
321 | printk(" SMBIOS=0x%lx ", config_tables[i].table); | |
322 | } else if (!efi_guidcmp(config_tables[i].guid, | |
323 | HCDP_TABLE_GUID)) { | |
324 | efi.hcdp = config_tables[i].table; | |
325 | printk(" HCDP=0x%lx ", config_tables[i].table); | |
326 | } else if (!efi_guidcmp(config_tables[i].guid, | |
327 | UGA_IO_PROTOCOL_GUID)) { | |
328 | efi.uga = config_tables[i].table; | |
329 | printk(" UGA=0x%lx ", config_tables[i].table); | |
330 | } | |
331 | } | |
332 | printk("\n"); | |
beacfaac | 333 | early_iounmap(config_tables, |
5b83683f HY |
334 | efi.systab->nr_tables * sizeof(efi_config_table_t)); |
335 | ||
336 | /* | |
337 | * Check out the runtime services table. We need to map | |
338 | * the runtime services table so that we can grab the physical | |
339 | * address of several of the EFI runtime functions, needed to | |
340 | * set the firmware into virtual mode. | |
341 | */ | |
beacfaac HY |
342 | runtime = early_ioremap((unsigned long)efi.systab->runtime, |
343 | sizeof(efi_runtime_services_t)); | |
5b83683f HY |
344 | if (runtime != NULL) { |
345 | /* | |
346 | * We will only need *early* access to the following | |
347 | * two EFI runtime services before set_virtual_address_map | |
348 | * is invoked. | |
349 | */ | |
350 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; | |
351 | efi_phys.set_virtual_address_map = | |
352 | (efi_set_virtual_address_map_t *) | |
353 | runtime->set_virtual_address_map; | |
354 | /* | |
355 | * Make efi_get_time can be called before entering | |
356 | * virtual mode. | |
357 | */ | |
358 | efi.get_time = phys_efi_get_time; | |
359 | } else | |
360 | printk(KERN_ERR "Could not map the EFI runtime service " | |
361 | "table!\n"); | |
beacfaac | 362 | early_iounmap(runtime, sizeof(efi_runtime_services_t)); |
5b83683f HY |
363 | |
364 | /* Map the EFI memory map */ | |
beacfaac HY |
365 | memmap.map = early_ioremap((unsigned long)memmap.phys_map, |
366 | memmap.nr_map * memmap.desc_size); | |
5b83683f HY |
367 | if (memmap.map == NULL) |
368 | printk(KERN_ERR "Could not map the EFI memory map!\n"); | |
369 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); | |
370 | if (memmap.desc_size != sizeof(efi_memory_desc_t)) | |
371 | printk(KERN_WARNING "Kernel-defined memdesc" | |
372 | "doesn't match the one from EFI!\n"); | |
373 | ||
5b83683f HY |
374 | /* Setup for EFI runtime service */ |
375 | reboot_type = BOOT_EFI; | |
376 | ||
5b83683f HY |
377 | #if EFI_DEBUG |
378 | print_efi_memmap(); | |
379 | #endif | |
380 | } | |
381 | ||
a2172e25 HY |
382 | static void __init runtime_code_page_mkexec(void) |
383 | { | |
384 | efi_memory_desc_t *md; | |
a2172e25 HY |
385 | void *p; |
386 | ||
387 | if (!(__supported_pte_mask & _PAGE_NX)) | |
388 | return; | |
389 | ||
390 | /* Make EFI runtime service code area executable */ | |
391 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
392 | md = p; | |
1c083eb2 HY |
393 | |
394 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
395 | continue; | |
396 | ||
397 | set_memory_x(md->virt_addr, md->num_pages << EFI_PAGE_SHIFT); | |
a2172e25 | 398 | } |
a2172e25 | 399 | } |
a2172e25 | 400 | |
5b83683f HY |
401 | /* |
402 | * This function will switch the EFI runtime services to virtual mode. | |
403 | * Essentially, look through the EFI memmap and map every region that | |
404 | * has the runtime attribute bit set in its memory descriptor and update | |
405 | * that memory descriptor with the virtual address obtained from ioremap(). | |
406 | * This enables the runtime services to be called without having to | |
407 | * thunk back into physical mode for every invocation. | |
408 | */ | |
409 | void __init efi_enter_virtual_mode(void) | |
410 | { | |
411 | efi_memory_desc_t *md; | |
412 | efi_status_t status; | |
1c083eb2 HY |
413 | unsigned long size; |
414 | u64 end, systab; | |
415 | void *p, *va; | |
5b83683f HY |
416 | |
417 | efi.systab = NULL; | |
418 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
419 | md = p; | |
420 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) | |
421 | continue; | |
1c083eb2 HY |
422 | |
423 | size = md->num_pages << EFI_PAGE_SHIFT; | |
424 | end = md->phys_addr + size; | |
425 | ||
426 | if ((end >> PAGE_SHIFT) <= max_pfn_mapped) | |
427 | va = __va(md->phys_addr); | |
5b83683f | 428 | else |
1c083eb2 HY |
429 | va = efi_ioremap(md->phys_addr, size); |
430 | ||
1c083eb2 HY |
431 | md->virt_addr = (u64) (unsigned long) va; |
432 | ||
433 | if (!va) { | |
5b83683f HY |
434 | printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n", |
435 | (unsigned long long)md->phys_addr); | |
1c083eb2 HY |
436 | continue; |
437 | } | |
438 | ||
e85f2051 TG |
439 | if (!(md->attribute & EFI_MEMORY_WB)) |
440 | set_memory_uc(md->virt_addr, size); | |
441 | ||
1c083eb2 HY |
442 | systab = (u64) (unsigned long) efi_phys.systab; |
443 | if (md->phys_addr <= systab && systab < end) { | |
444 | systab += md->virt_addr - md->phys_addr; | |
445 | efi.systab = (efi_system_table_t *) (unsigned long) systab; | |
446 | } | |
5b83683f HY |
447 | } |
448 | ||
449 | BUG_ON(!efi.systab); | |
450 | ||
451 | status = phys_efi_set_virtual_address_map( | |
452 | memmap.desc_size * memmap.nr_map, | |
453 | memmap.desc_size, | |
454 | memmap.desc_version, | |
455 | memmap.phys_map); | |
456 | ||
457 | if (status != EFI_SUCCESS) { | |
458 | printk(KERN_ALERT "Unable to switch EFI into virtual mode " | |
459 | "(status=%lx)!\n", status); | |
460 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
461 | } | |
462 | ||
463 | /* | |
464 | * Now that EFI is in virtual mode, update the function | |
465 | * pointers in the runtime service table to the new virtual addresses. | |
466 | * | |
467 | * Call EFI services through wrapper functions. | |
468 | */ | |
469 | efi.get_time = virt_efi_get_time; | |
470 | efi.set_time = virt_efi_set_time; | |
471 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
472 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
473 | efi.get_variable = virt_efi_get_variable; | |
474 | efi.get_next_variable = virt_efi_get_next_variable; | |
475 | efi.set_variable = virt_efi_set_variable; | |
476 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
477 | efi.reset_system = virt_efi_reset_system; | |
478 | efi.set_virtual_address_map = virt_efi_set_virtual_address_map; | |
5b83683f | 479 | runtime_code_page_mkexec(); |
a3828064 HY |
480 | early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); |
481 | memmap.map = NULL; | |
5b83683f HY |
482 | } |
483 | ||
484 | /* | |
485 | * Convenience functions to obtain memory types and attributes | |
486 | */ | |
487 | u32 efi_mem_type(unsigned long phys_addr) | |
488 | { | |
489 | efi_memory_desc_t *md; | |
490 | void *p; | |
491 | ||
492 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
493 | md = p; | |
494 | if ((md->phys_addr <= phys_addr) && | |
495 | (phys_addr < (md->phys_addr + | |
496 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
497 | return md->type; | |
498 | } | |
499 | return 0; | |
500 | } | |
501 | ||
502 | u64 efi_mem_attributes(unsigned long phys_addr) | |
503 | { | |
504 | efi_memory_desc_t *md; | |
505 | void *p; | |
506 | ||
507 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
508 | md = p; | |
509 | if ((md->phys_addr <= phys_addr) && | |
510 | (phys_addr < (md->phys_addr + | |
511 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
512 | return md->attribute; | |
513 | } | |
514 | return 0; | |
515 | } |