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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Extensible Firmware Interface | |
3 | * | |
4 | * Based on Extensible Firmware Interface Specification version 1.0 | |
5 | * | |
6 | * Copyright (C) 1999 VA Linux Systems | |
7 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
8 | * Copyright (C) 1999-2002 Hewlett-Packard Co. | |
9 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
10 | * Stephane Eranian <eranian@hpl.hp.com> | |
11 | * | |
12 | * All EFI Runtime Services are not implemented yet as EFI only | |
13 | * supports physical mode addressing on SoftSDV. This is to be fixed | |
14 | * in a future version. --drummond 1999-07-20 | |
15 | * | |
16 | * Implemented EFI runtime services and virtual mode calls. --davidm | |
17 | * | |
18 | * Goutham Rao: <goutham.rao@intel.com> | |
19 | * Skip non-WB memory and ignore empty memory ranges. | |
20 | */ | |
21 | ||
1da177e4 LT |
22 | #include <linux/kernel.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/bootmem.h> | |
29 | #include <linux/ioport.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/efi.h> | |
1bc3b91a | 32 | #include <linux/kexec.h> |
1da177e4 LT |
33 | |
34 | #include <asm/setup.h> | |
35 | #include <asm/io.h> | |
36 | #include <asm/page.h> | |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/processor.h> | |
39 | #include <asm/desc.h> | |
40 | #include <asm/tlbflush.h> | |
41 | ||
42 | #define EFI_DEBUG 0 | |
43 | #define PFX "EFI: " | |
44 | ||
45 | extern efi_status_t asmlinkage efi_call_phys(void *, ...); | |
46 | ||
47 | struct efi efi; | |
48 | EXPORT_SYMBOL(efi); | |
c41f5eb3 | 49 | static struct efi efi_phys; |
50 | struct efi_memory_map memmap; | |
1da177e4 LT |
51 | |
52 | /* | |
53 | * We require an early boot_ioremap mapping mechanism initially | |
54 | */ | |
55 | extern void * boot_ioremap(unsigned long, unsigned long); | |
56 | ||
57 | /* | |
58 | * To make EFI call EFI runtime service in physical addressing mode we need | |
59 | * prelog/epilog before/after the invocation to disable interrupt, to | |
60 | * claim EFI runtime service handler exclusively and to duplicate a memory in | |
61 | * low memory space say 0 - 3G. | |
62 | */ | |
63 | ||
64 | static unsigned long efi_rt_eflags; | |
65 | static DEFINE_SPINLOCK(efi_rt_lock); | |
66 | static pgd_t efi_bak_pg_dir_pointer[2]; | |
67 | ||
b0de7fca | 68 | static void efi_call_phys_prelog(void) __acquires(efi_rt_lock) |
1da177e4 LT |
69 | { |
70 | unsigned long cr4; | |
71 | unsigned long temp; | |
4fbb5968 | 72 | struct Xgt_desc_struct gdt_descr; |
1da177e4 LT |
73 | |
74 | spin_lock(&efi_rt_lock); | |
75 | local_irq_save(efi_rt_eflags); | |
76 | ||
77 | /* | |
78 | * If I don't have PSE, I should just duplicate two entries in page | |
79 | * directory. If I have PSE, I just need to duplicate one entry in | |
80 | * page directory. | |
81 | */ | |
4bb0d3ec | 82 | cr4 = read_cr4(); |
1da177e4 LT |
83 | |
84 | if (cr4 & X86_CR4_PSE) { | |
85 | efi_bak_pg_dir_pointer[0].pgd = | |
86 | swapper_pg_dir[pgd_index(0)].pgd; | |
87 | swapper_pg_dir[0].pgd = | |
88 | swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd; | |
89 | } else { | |
90 | efi_bak_pg_dir_pointer[0].pgd = | |
91 | swapper_pg_dir[pgd_index(0)].pgd; | |
92 | efi_bak_pg_dir_pointer[1].pgd = | |
93 | swapper_pg_dir[pgd_index(0x400000)].pgd; | |
94 | swapper_pg_dir[pgd_index(0)].pgd = | |
95 | swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd; | |
96 | temp = PAGE_OFFSET + 0x400000; | |
97 | swapper_pg_dir[pgd_index(0x400000)].pgd = | |
98 | swapper_pg_dir[pgd_index(temp)].pgd; | |
99 | } | |
100 | ||
101 | /* | |
102 | * After the lock is released, the original page table is restored. | |
103 | */ | |
104 | local_flush_tlb(); | |
105 | ||
4fbb5968 RR |
106 | gdt_descr.address = __pa(get_cpu_gdt_table(0)); |
107 | gdt_descr.size = GDT_SIZE - 1; | |
108 | load_gdt(&gdt_descr); | |
1da177e4 LT |
109 | } |
110 | ||
b0de7fca | 111 | static void efi_call_phys_epilog(void) __releases(efi_rt_lock) |
1da177e4 LT |
112 | { |
113 | unsigned long cr4; | |
4fbb5968 | 114 | struct Xgt_desc_struct gdt_descr; |
1da177e4 | 115 | |
4fbb5968 RR |
116 | gdt_descr.address = (unsigned long)get_cpu_gdt_table(0); |
117 | gdt_descr.size = GDT_SIZE - 1; | |
118 | load_gdt(&gdt_descr); | |
2b932f6c | 119 | |
4bb0d3ec | 120 | cr4 = read_cr4(); |
1da177e4 LT |
121 | |
122 | if (cr4 & X86_CR4_PSE) { | |
123 | swapper_pg_dir[pgd_index(0)].pgd = | |
124 | efi_bak_pg_dir_pointer[0].pgd; | |
125 | } else { | |
126 | swapper_pg_dir[pgd_index(0)].pgd = | |
127 | efi_bak_pg_dir_pointer[0].pgd; | |
128 | swapper_pg_dir[pgd_index(0x400000)].pgd = | |
129 | efi_bak_pg_dir_pointer[1].pgd; | |
130 | } | |
131 | ||
132 | /* | |
133 | * After the lock is released, the original page table is restored. | |
134 | */ | |
135 | local_flush_tlb(); | |
136 | ||
137 | local_irq_restore(efi_rt_eflags); | |
138 | spin_unlock(&efi_rt_lock); | |
139 | } | |
140 | ||
141 | static efi_status_t | |
142 | phys_efi_set_virtual_address_map(unsigned long memory_map_size, | |
143 | unsigned long descriptor_size, | |
144 | u32 descriptor_version, | |
145 | efi_memory_desc_t *virtual_map) | |
146 | { | |
147 | efi_status_t status; | |
148 | ||
149 | efi_call_phys_prelog(); | |
150 | status = efi_call_phys(efi_phys.set_virtual_address_map, | |
151 | memory_map_size, descriptor_size, | |
152 | descriptor_version, virtual_map); | |
153 | efi_call_phys_epilog(); | |
154 | return status; | |
155 | } | |
156 | ||
157 | static efi_status_t | |
158 | phys_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) | |
159 | { | |
160 | efi_status_t status; | |
161 | ||
162 | efi_call_phys_prelog(); | |
163 | status = efi_call_phys(efi_phys.get_time, tm, tc); | |
164 | efi_call_phys_epilog(); | |
165 | return status; | |
166 | } | |
167 | ||
168 | inline int efi_set_rtc_mmss(unsigned long nowtime) | |
169 | { | |
170 | int real_seconds, real_minutes; | |
171 | efi_status_t status; | |
172 | efi_time_t eft; | |
173 | efi_time_cap_t cap; | |
174 | ||
175 | spin_lock(&efi_rt_lock); | |
176 | status = efi.get_time(&eft, &cap); | |
177 | spin_unlock(&efi_rt_lock); | |
178 | if (status != EFI_SUCCESS) | |
179 | panic("Ooops, efitime: can't read time!\n"); | |
180 | real_seconds = nowtime % 60; | |
181 | real_minutes = nowtime / 60; | |
182 | ||
183 | if (((abs(real_minutes - eft.minute) + 15)/30) & 1) | |
184 | real_minutes += 30; | |
185 | real_minutes %= 60; | |
186 | ||
187 | eft.minute = real_minutes; | |
188 | eft.second = real_seconds; | |
189 | ||
190 | if (status != EFI_SUCCESS) { | |
191 | printk("Ooops: efitime: can't read time!\n"); | |
192 | return -1; | |
193 | } | |
194 | return 0; | |
195 | } | |
196 | /* | |
e1cccf48 AM |
197 | * This is used during kernel init before runtime |
198 | * services have been remapped and also during suspend, therefore, | |
199 | * we'll need to call both in physical and virtual modes. | |
1da177e4 | 200 | */ |
e1cccf48 | 201 | inline unsigned long efi_get_time(void) |
1da177e4 LT |
202 | { |
203 | efi_status_t status; | |
204 | efi_time_t eft; | |
205 | efi_time_cap_t cap; | |
206 | ||
e1cccf48 AM |
207 | if (efi.get_time) { |
208 | /* if we are in virtual mode use remapped function */ | |
209 | status = efi.get_time(&eft, &cap); | |
210 | } else { | |
211 | /* we are in physical mode */ | |
212 | status = phys_efi_get_time(&eft, &cap); | |
213 | } | |
214 | ||
1da177e4 LT |
215 | if (status != EFI_SUCCESS) |
216 | printk("Oops: efitime: can't read time status: 0x%lx\n",status); | |
217 | ||
218 | return mktime(eft.year, eft.month, eft.day, eft.hour, | |
219 | eft.minute, eft.second); | |
220 | } | |
221 | ||
222 | int is_available_memory(efi_memory_desc_t * md) | |
223 | { | |
224 | if (!(md->attribute & EFI_MEMORY_WB)) | |
225 | return 0; | |
226 | ||
227 | switch (md->type) { | |
228 | case EFI_LOADER_CODE: | |
229 | case EFI_LOADER_DATA: | |
230 | case EFI_BOOT_SERVICES_CODE: | |
231 | case EFI_BOOT_SERVICES_DATA: | |
232 | case EFI_CONVENTIONAL_MEMORY: | |
233 | return 1; | |
234 | } | |
235 | return 0; | |
236 | } | |
237 | ||
238 | /* | |
239 | * We need to map the EFI memory map again after paging_init(). | |
240 | */ | |
241 | void __init efi_map_memmap(void) | |
242 | { | |
243 | memmap.map = NULL; | |
244 | ||
7ae65fd3 MT |
245 | memmap.map = bt_ioremap((unsigned long) memmap.phys_map, |
246 | (memmap.nr_map * memmap.desc_size)); | |
1da177e4 LT |
247 | if (memmap.map == NULL) |
248 | printk(KERN_ERR PFX "Could not remap the EFI memmap!\n"); | |
7ae65fd3 MT |
249 | |
250 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); | |
1da177e4 LT |
251 | } |
252 | ||
253 | #if EFI_DEBUG | |
254 | static void __init print_efi_memmap(void) | |
255 | { | |
256 | efi_memory_desc_t *md; | |
7ae65fd3 | 257 | void *p; |
1da177e4 LT |
258 | int i; |
259 | ||
7ae65fd3 MT |
260 | for (p = memmap.map, i = 0; p < memmap.map_end; p += memmap.desc_size, i++) { |
261 | md = p; | |
1da177e4 LT |
262 | printk(KERN_INFO "mem%02u: type=%u, attr=0x%llx, " |
263 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", | |
264 | i, md->type, md->attribute, md->phys_addr, | |
265 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
266 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
267 | } | |
268 | } | |
269 | #endif /* EFI_DEBUG */ | |
270 | ||
271 | /* | |
272 | * Walks the EFI memory map and calls CALLBACK once for each EFI | |
273 | * memory descriptor that has memory that is available for kernel use. | |
274 | */ | |
275 | void efi_memmap_walk(efi_freemem_callback_t callback, void *arg) | |
276 | { | |
277 | int prev_valid = 0; | |
278 | struct range { | |
279 | unsigned long start; | |
280 | unsigned long end; | |
8e1c091c | 281 | } uninitialized_var(prev), curr; |
1da177e4 LT |
282 | efi_memory_desc_t *md; |
283 | unsigned long start, end; | |
7ae65fd3 | 284 | void *p; |
1da177e4 | 285 | |
7ae65fd3 MT |
286 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
287 | md = p; | |
1da177e4 LT |
288 | |
289 | if ((md->num_pages == 0) || (!is_available_memory(md))) | |
290 | continue; | |
291 | ||
292 | curr.start = md->phys_addr; | |
293 | curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT); | |
294 | ||
295 | if (!prev_valid) { | |
296 | prev = curr; | |
297 | prev_valid = 1; | |
298 | } else { | |
299 | if (curr.start < prev.start) | |
300 | printk(KERN_INFO PFX "Unordered memory map\n"); | |
301 | if (prev.end == curr.start) | |
302 | prev.end = curr.end; | |
303 | else { | |
304 | start = | |
305 | (unsigned long) (PAGE_ALIGN(prev.start)); | |
306 | end = (unsigned long) (prev.end & PAGE_MASK); | |
307 | if ((end > start) | |
308 | && (*callback) (start, end, arg) < 0) | |
309 | return; | |
310 | prev = curr; | |
311 | } | |
312 | } | |
313 | } | |
314 | if (prev_valid) { | |
315 | start = (unsigned long) PAGE_ALIGN(prev.start); | |
316 | end = (unsigned long) (prev.end & PAGE_MASK); | |
317 | if (end > start) | |
318 | (*callback) (start, end, arg); | |
319 | } | |
320 | } | |
321 | ||
322 | void __init efi_init(void) | |
323 | { | |
324 | efi_config_table_t *config_tables; | |
325 | efi_runtime_services_t *runtime; | |
326 | efi_char16_t *c16; | |
327 | char vendor[100] = "unknown"; | |
328 | unsigned long num_config_tables; | |
329 | int i = 0; | |
330 | ||
331 | memset(&efi, 0, sizeof(efi) ); | |
332 | memset(&efi_phys, 0, sizeof(efi_phys)); | |
333 | ||
30c82645 PA |
334 | efi_phys.systab = |
335 | (efi_system_table_t *)boot_params.efi_info.efi_systab; | |
336 | memmap.phys_map = (void *)boot_params.efi_info.efi_memmap; | |
337 | memmap.nr_map = boot_params.efi_info.efi_memmap_size/ | |
338 | boot_params.efi_info.efi_memdesc_size; | |
339 | memmap.desc_version = boot_params.efi_info.efi_memdesc_version; | |
340 | memmap.desc_size = boot_params.efi_info.efi_memdesc_size; | |
1da177e4 LT |
341 | |
342 | efi.systab = (efi_system_table_t *) | |
343 | boot_ioremap((unsigned long) efi_phys.systab, | |
344 | sizeof(efi_system_table_t)); | |
345 | /* | |
346 | * Verify the EFI Table | |
347 | */ | |
348 | if (efi.systab == NULL) | |
349 | printk(KERN_ERR PFX "Woah! Couldn't map the EFI system table.\n"); | |
350 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) | |
351 | printk(KERN_ERR PFX "Woah! EFI system table signature incorrect\n"); | |
873ec746 BH |
352 | if ((efi.systab->hdr.revision >> 16) == 0) |
353 | printk(KERN_ERR PFX "Warning: EFI system table version " | |
354 | "%d.%02d, expected 1.00 or greater\n", | |
1da177e4 | 355 | efi.systab->hdr.revision >> 16, |
873ec746 BH |
356 | efi.systab->hdr.revision & 0xffff); |
357 | ||
1da177e4 LT |
358 | /* |
359 | * Grab some details from the system table | |
360 | */ | |
361 | num_config_tables = efi.systab->nr_tables; | |
362 | config_tables = (efi_config_table_t *)efi.systab->tables; | |
363 | runtime = efi.systab->runtime; | |
364 | ||
365 | /* | |
366 | * Show what we know for posterity | |
367 | */ | |
368 | c16 = (efi_char16_t *) boot_ioremap(efi.systab->fw_vendor, 2); | |
369 | if (c16) { | |
d6d21dfd | 370 | for (i = 0; i < (sizeof(vendor) - 1) && *c16; ++i) |
1da177e4 LT |
371 | vendor[i] = *c16++; |
372 | vendor[i] = '\0'; | |
373 | } else | |
374 | printk(KERN_ERR PFX "Could not map the firmware vendor!\n"); | |
375 | ||
376 | printk(KERN_INFO PFX "EFI v%u.%.02u by %s \n", | |
377 | efi.systab->hdr.revision >> 16, | |
378 | efi.systab->hdr.revision & 0xffff, vendor); | |
379 | ||
380 | /* | |
381 | * Let's see what config tables the firmware passed to us. | |
382 | */ | |
383 | config_tables = (efi_config_table_t *) | |
384 | boot_ioremap((unsigned long) config_tables, | |
385 | num_config_tables * sizeof(efi_config_table_t)); | |
386 | ||
387 | if (config_tables == NULL) | |
388 | printk(KERN_ERR PFX "Could not map EFI Configuration Table!\n"); | |
389 | ||
b2c99e3c BH |
390 | efi.mps = EFI_INVALID_TABLE_ADDR; |
391 | efi.acpi = EFI_INVALID_TABLE_ADDR; | |
392 | efi.acpi20 = EFI_INVALID_TABLE_ADDR; | |
393 | efi.smbios = EFI_INVALID_TABLE_ADDR; | |
394 | efi.sal_systab = EFI_INVALID_TABLE_ADDR; | |
395 | efi.boot_info = EFI_INVALID_TABLE_ADDR; | |
396 | efi.hcdp = EFI_INVALID_TABLE_ADDR; | |
397 | efi.uga = EFI_INVALID_TABLE_ADDR; | |
398 | ||
1da177e4 LT |
399 | for (i = 0; i < num_config_tables; i++) { |
400 | if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) { | |
b2c99e3c | 401 | efi.mps = config_tables[i].table; |
1da177e4 LT |
402 | printk(KERN_INFO " MPS=0x%lx ", config_tables[i].table); |
403 | } else | |
404 | if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) { | |
b2c99e3c | 405 | efi.acpi20 = config_tables[i].table; |
1da177e4 LT |
406 | printk(KERN_INFO " ACPI 2.0=0x%lx ", config_tables[i].table); |
407 | } else | |
408 | if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) { | |
b2c99e3c | 409 | efi.acpi = config_tables[i].table; |
1da177e4 LT |
410 | printk(KERN_INFO " ACPI=0x%lx ", config_tables[i].table); |
411 | } else | |
412 | if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) { | |
b2c99e3c | 413 | efi.smbios = config_tables[i].table; |
1da177e4 LT |
414 | printk(KERN_INFO " SMBIOS=0x%lx ", config_tables[i].table); |
415 | } else | |
416 | if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) { | |
b2c99e3c | 417 | efi.hcdp = config_tables[i].table; |
1da177e4 LT |
418 | printk(KERN_INFO " HCDP=0x%lx ", config_tables[i].table); |
419 | } else | |
420 | if (efi_guidcmp(config_tables[i].guid, UGA_IO_PROTOCOL_GUID) == 0) { | |
b2c99e3c | 421 | efi.uga = config_tables[i].table; |
1da177e4 LT |
422 | printk(KERN_INFO " UGA=0x%lx ", config_tables[i].table); |
423 | } | |
424 | } | |
425 | printk("\n"); | |
426 | ||
427 | /* | |
428 | * Check out the runtime services table. We need to map | |
429 | * the runtime services table so that we can grab the physical | |
430 | * address of several of the EFI runtime functions, needed to | |
431 | * set the firmware into virtual mode. | |
432 | */ | |
433 | ||
434 | runtime = (efi_runtime_services_t *) boot_ioremap((unsigned long) | |
435 | runtime, | |
436 | sizeof(efi_runtime_services_t)); | |
437 | if (runtime != NULL) { | |
438 | /* | |
439 | * We will only need *early* access to the following | |
440 | * two EFI runtime services before set_virtual_address_map | |
441 | * is invoked. | |
442 | */ | |
443 | efi_phys.get_time = (efi_get_time_t *) runtime->get_time; | |
444 | efi_phys.set_virtual_address_map = | |
445 | (efi_set_virtual_address_map_t *) | |
446 | runtime->set_virtual_address_map; | |
447 | } else | |
448 | printk(KERN_ERR PFX "Could not map the runtime service table!\n"); | |
449 | ||
450 | /* Map the EFI memory map for use until paging_init() */ | |
30c82645 PA |
451 | memmap.map = boot_ioremap(boot_params.efi_info.efi_memmap, |
452 | boot_params.efi_info.efi_memmap_size); | |
1da177e4 LT |
453 | if (memmap.map == NULL) |
454 | printk(KERN_ERR PFX "Could not map the EFI memory map!\n"); | |
455 | ||
7ae65fd3 MT |
456 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
457 | ||
1da177e4 LT |
458 | #if EFI_DEBUG |
459 | print_efi_memmap(); | |
460 | #endif | |
461 | } | |
462 | ||
7ae65fd3 MT |
463 | static inline void __init check_range_for_systab(efi_memory_desc_t *md) |
464 | { | |
465 | if (((unsigned long)md->phys_addr <= (unsigned long)efi_phys.systab) && | |
466 | ((unsigned long)efi_phys.systab < md->phys_addr + | |
467 | ((unsigned long)md->num_pages << EFI_PAGE_SHIFT))) { | |
468 | unsigned long addr; | |
469 | ||
470 | addr = md->virt_addr - md->phys_addr + | |
471 | (unsigned long)efi_phys.systab; | |
472 | efi.systab = (efi_system_table_t *)addr; | |
473 | } | |
474 | } | |
475 | ||
40c373cc FR |
476 | /* |
477 | * Wrap all the virtual calls in a way that forces the parameters on the stack. | |
478 | */ | |
479 | ||
480 | #define efi_call_virt(f, args...) \ | |
481 | ((efi_##f##_t __attribute__((regparm(0)))*)efi.systab->runtime->f)(args) | |
482 | ||
483 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) | |
484 | { | |
485 | return efi_call_virt(get_time, tm, tc); | |
486 | } | |
487 | ||
488 | static efi_status_t virt_efi_set_time (efi_time_t *tm) | |
489 | { | |
490 | return efi_call_virt(set_time, tm); | |
491 | } | |
492 | ||
493 | static efi_status_t virt_efi_get_wakeup_time (efi_bool_t *enabled, | |
494 | efi_bool_t *pending, | |
495 | efi_time_t *tm) | |
496 | { | |
497 | return efi_call_virt(get_wakeup_time, enabled, pending, tm); | |
498 | } | |
499 | ||
500 | static efi_status_t virt_efi_set_wakeup_time (efi_bool_t enabled, | |
501 | efi_time_t *tm) | |
502 | { | |
503 | return efi_call_virt(set_wakeup_time, enabled, tm); | |
504 | } | |
505 | ||
506 | static efi_status_t virt_efi_get_variable (efi_char16_t *name, | |
507 | efi_guid_t *vendor, u32 *attr, | |
508 | unsigned long *data_size, void *data) | |
509 | { | |
510 | return efi_call_virt(get_variable, name, vendor, attr, data_size, data); | |
511 | } | |
512 | ||
513 | static efi_status_t virt_efi_get_next_variable (unsigned long *name_size, | |
514 | efi_char16_t *name, | |
515 | efi_guid_t *vendor) | |
516 | { | |
517 | return efi_call_virt(get_next_variable, name_size, name, vendor); | |
518 | } | |
519 | ||
520 | static efi_status_t virt_efi_set_variable (efi_char16_t *name, | |
521 | efi_guid_t *vendor, | |
522 | unsigned long attr, | |
523 | unsigned long data_size, void *data) | |
524 | { | |
525 | return efi_call_virt(set_variable, name, vendor, attr, data_size, data); | |
526 | } | |
527 | ||
528 | static efi_status_t virt_efi_get_next_high_mono_count (u32 *count) | |
529 | { | |
530 | return efi_call_virt(get_next_high_mono_count, count); | |
531 | } | |
532 | ||
533 | static void virt_efi_reset_system (int reset_type, efi_status_t status, | |
534 | unsigned long data_size, | |
535 | efi_char16_t *data) | |
536 | { | |
537 | efi_call_virt(reset_system, reset_type, status, data_size, data); | |
538 | } | |
539 | ||
1da177e4 LT |
540 | /* |
541 | * This function will switch the EFI runtime services to virtual mode. | |
542 | * Essentially, look through the EFI memmap and map every region that | |
543 | * has the runtime attribute bit set in its memory descriptor and update | |
544 | * that memory descriptor with the virtual address obtained from ioremap(). | |
545 | * This enables the runtime services to be called without having to | |
546 | * thunk back into physical mode for every invocation. | |
547 | */ | |
548 | ||
549 | void __init efi_enter_virtual_mode(void) | |
550 | { | |
551 | efi_memory_desc_t *md; | |
552 | efi_status_t status; | |
7ae65fd3 | 553 | void *p; |
1da177e4 LT |
554 | |
555 | efi.systab = NULL; | |
556 | ||
7ae65fd3 MT |
557 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
558 | md = p; | |
1da177e4 | 559 | |
7ae65fd3 MT |
560 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) |
561 | continue; | |
1da177e4 | 562 | |
7ae65fd3 MT |
563 | md->virt_addr = (unsigned long)ioremap(md->phys_addr, |
564 | md->num_pages << EFI_PAGE_SHIFT); | |
565 | if (!(unsigned long)md->virt_addr) { | |
566 | printk(KERN_ERR PFX "ioremap of 0x%lX failed\n", | |
567 | (unsigned long)md->phys_addr); | |
1da177e4 | 568 | } |
7ae65fd3 MT |
569 | /* update the virtual address of the EFI system table */ |
570 | check_range_for_systab(md); | |
1da177e4 LT |
571 | } |
572 | ||
8d8f3cbe | 573 | BUG_ON(!efi.systab); |
1da177e4 LT |
574 | |
575 | status = phys_efi_set_virtual_address_map( | |
7ae65fd3 MT |
576 | memmap.desc_size * memmap.nr_map, |
577 | memmap.desc_size, | |
1da177e4 LT |
578 | memmap.desc_version, |
579 | memmap.phys_map); | |
580 | ||
581 | if (status != EFI_SUCCESS) { | |
582 | printk (KERN_ALERT "You are screwed! " | |
583 | "Unable to switch EFI into virtual mode " | |
584 | "(status=%lx)\n", status); | |
585 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
586 | } | |
587 | ||
588 | /* | |
589 | * Now that EFI is in virtual mode, update the function | |
590 | * pointers in the runtime service table to the new virtual addresses. | |
591 | */ | |
592 | ||
40c373cc FR |
593 | efi.get_time = virt_efi_get_time; |
594 | efi.set_time = virt_efi_set_time; | |
595 | efi.get_wakeup_time = virt_efi_get_wakeup_time; | |
596 | efi.set_wakeup_time = virt_efi_set_wakeup_time; | |
597 | efi.get_variable = virt_efi_get_variable; | |
598 | efi.get_next_variable = virt_efi_get_next_variable; | |
599 | efi.set_variable = virt_efi_set_variable; | |
600 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; | |
601 | efi.reset_system = virt_efi_reset_system; | |
1da177e4 LT |
602 | } |
603 | ||
604 | void __init | |
605 | efi_initialize_iomem_resources(struct resource *code_resource, | |
00bf4098 BW |
606 | struct resource *data_resource, |
607 | struct resource *bss_resource) | |
1da177e4 LT |
608 | { |
609 | struct resource *res; | |
610 | efi_memory_desc_t *md; | |
7ae65fd3 | 611 | void *p; |
1da177e4 | 612 | |
7ae65fd3 MT |
613 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
614 | md = p; | |
1da177e4 LT |
615 | |
616 | if ((md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) > | |
617 | 0x100000000ULL) | |
618 | continue; | |
b408cbc7 | 619 | res = kzalloc(sizeof(struct resource), GFP_ATOMIC); |
1da177e4 LT |
620 | switch (md->type) { |
621 | case EFI_RESERVED_TYPE: | |
622 | res->name = "Reserved Memory"; | |
623 | break; | |
624 | case EFI_LOADER_CODE: | |
625 | res->name = "Loader Code"; | |
626 | break; | |
627 | case EFI_LOADER_DATA: | |
628 | res->name = "Loader Data"; | |
629 | break; | |
630 | case EFI_BOOT_SERVICES_DATA: | |
631 | res->name = "BootServices Data"; | |
632 | break; | |
633 | case EFI_BOOT_SERVICES_CODE: | |
634 | res->name = "BootServices Code"; | |
635 | break; | |
636 | case EFI_RUNTIME_SERVICES_CODE: | |
637 | res->name = "Runtime Service Code"; | |
638 | break; | |
639 | case EFI_RUNTIME_SERVICES_DATA: | |
640 | res->name = "Runtime Service Data"; | |
641 | break; | |
642 | case EFI_CONVENTIONAL_MEMORY: | |
643 | res->name = "Conventional Memory"; | |
644 | break; | |
645 | case EFI_UNUSABLE_MEMORY: | |
646 | res->name = "Unusable Memory"; | |
647 | break; | |
648 | case EFI_ACPI_RECLAIM_MEMORY: | |
649 | res->name = "ACPI Reclaim"; | |
650 | break; | |
651 | case EFI_ACPI_MEMORY_NVS: | |
652 | res->name = "ACPI NVS"; | |
653 | break; | |
654 | case EFI_MEMORY_MAPPED_IO: | |
655 | res->name = "Memory Mapped IO"; | |
656 | break; | |
657 | case EFI_MEMORY_MAPPED_IO_PORT_SPACE: | |
658 | res->name = "Memory Mapped IO Port Space"; | |
659 | break; | |
660 | default: | |
661 | res->name = "Reserved"; | |
662 | break; | |
663 | } | |
664 | res->start = md->phys_addr; | |
665 | res->end = res->start + ((md->num_pages << EFI_PAGE_SHIFT) - 1); | |
666 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
667 | if (request_resource(&iomem_resource, res) < 0) | |
685143ac GKH |
668 | printk(KERN_ERR PFX "Failed to allocate res %s : " |
669 | "0x%llx-0x%llx\n", res->name, | |
670 | (unsigned long long)res->start, | |
671 | (unsigned long long)res->end); | |
1da177e4 LT |
672 | /* |
673 | * We don't know which region contains kernel data so we try | |
674 | * it repeatedly and let the resource manager test it. | |
675 | */ | |
676 | if (md->type == EFI_CONVENTIONAL_MEMORY) { | |
677 | request_resource(res, code_resource); | |
678 | request_resource(res, data_resource); | |
00bf4098 | 679 | request_resource(res, bss_resource); |
1bc3b91a EB |
680 | #ifdef CONFIG_KEXEC |
681 | request_resource(res, &crashk_res); | |
682 | #endif | |
1da177e4 LT |
683 | } |
684 | } | |
685 | } | |
686 | ||
687 | /* | |
688 | * Convenience functions to obtain memory types and attributes | |
689 | */ | |
690 | ||
691 | u32 efi_mem_type(unsigned long phys_addr) | |
692 | { | |
693 | efi_memory_desc_t *md; | |
7ae65fd3 | 694 | void *p; |
1da177e4 | 695 | |
7ae65fd3 MT |
696 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
697 | md = p; | |
1da177e4 LT |
698 | if ((md->phys_addr <= phys_addr) && (phys_addr < |
699 | (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) )) | |
700 | return md->type; | |
701 | } | |
702 | return 0; | |
703 | } | |
704 | ||
705 | u64 efi_mem_attributes(unsigned long phys_addr) | |
706 | { | |
707 | efi_memory_desc_t *md; | |
7ae65fd3 | 708 | void *p; |
1da177e4 | 709 | |
7ae65fd3 MT |
710 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
711 | md = p; | |
1da177e4 LT |
712 | if ((md->phys_addr <= phys_addr) && (phys_addr < |
713 | (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) )) | |
714 | return md->attribute; | |
715 | } | |
716 | return 0; | |
717 | } |