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1 | /* | |
2 | * x86_64 specific EFI support functions | |
3 | * Based on Extensible Firmware Interface Specification version 1.0 | |
4 | * | |
5 | * Copyright (C) 2005-2008 Intel Co. | |
6 | * Fenghua Yu <fenghua.yu@intel.com> | |
7 | * Bibo Mao <bibo.mao@intel.com> | |
8 | * Chandramouli Narayanan <mouli@linux.intel.com> | |
9 | * Huang Ying <ying.huang@intel.com> | |
10 | * | |
11 | * Code to convert EFI to E820 map has been implemented in elilo bootloader | |
12 | * based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table | |
13 | * is setup appropriately for EFI runtime code. | |
14 | * - mouli 06/14/2007. | |
15 | * | |
16 | */ | |
17 | ||
18 | #define pr_fmt(fmt) "efi: " fmt | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/bootmem.h> | |
26 | #include <linux/ioport.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/mc146818rtc.h> | |
29 | #include <linux/efi.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <linux/io.h> | |
32 | #include <linux/reboot.h> | |
33 | #include <linux/slab.h> | |
34 | ||
35 | #include <asm/setup.h> | |
36 | #include <asm/page.h> | |
37 | #include <asm/e820.h> | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/tlbflush.h> | |
40 | #include <asm/proto.h> | |
41 | #include <asm/efi.h> | |
42 | #include <asm/cacheflush.h> | |
43 | #include <asm/fixmap.h> | |
44 | #include <asm/realmode.h> | |
45 | #include <asm/time.h> | |
46 | #include <asm/pgalloc.h> | |
47 | ||
48 | /* | |
49 | * We allocate runtime services regions bottom-up, starting from -4G, i.e. | |
50 | * 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G. | |
51 | */ | |
52 | static u64 efi_va = EFI_VA_START; | |
53 | ||
54 | struct efi_scratch efi_scratch; | |
55 | ||
56 | static void __init early_code_mapping_set_exec(int executable) | |
57 | { | |
58 | efi_memory_desc_t *md; | |
59 | ||
60 | if (!(__supported_pte_mask & _PAGE_NX)) | |
61 | return; | |
62 | ||
63 | /* Make EFI service code area executable */ | |
64 | for_each_efi_memory_desc(md) { | |
65 | if (md->type == EFI_RUNTIME_SERVICES_CODE || | |
66 | md->type == EFI_BOOT_SERVICES_CODE) | |
67 | efi_set_executable(md, executable); | |
68 | } | |
69 | } | |
70 | ||
71 | pgd_t * __init efi_call_phys_prolog(void) | |
72 | { | |
73 | unsigned long vaddress; | |
74 | pgd_t *save_pgd; | |
75 | ||
76 | int pgd; | |
77 | int n_pgds; | |
78 | ||
79 | if (!efi_enabled(EFI_OLD_MEMMAP)) { | |
80 | save_pgd = (pgd_t *)read_cr3(); | |
81 | write_cr3((unsigned long)efi_scratch.efi_pgt); | |
82 | goto out; | |
83 | } | |
84 | ||
85 | early_code_mapping_set_exec(1); | |
86 | ||
87 | n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE); | |
88 | save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL); | |
89 | ||
90 | for (pgd = 0; pgd < n_pgds; pgd++) { | |
91 | save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE); | |
92 | vaddress = (unsigned long)__va(pgd * PGDIR_SIZE); | |
93 | set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress)); | |
94 | } | |
95 | out: | |
96 | __flush_tlb_all(); | |
97 | ||
98 | return save_pgd; | |
99 | } | |
100 | ||
101 | void __init efi_call_phys_epilog(pgd_t *save_pgd) | |
102 | { | |
103 | /* | |
104 | * After the lock is released, the original page table is restored. | |
105 | */ | |
106 | int pgd_idx; | |
107 | int nr_pgds; | |
108 | ||
109 | if (!efi_enabled(EFI_OLD_MEMMAP)) { | |
110 | write_cr3((unsigned long)save_pgd); | |
111 | __flush_tlb_all(); | |
112 | return; | |
113 | } | |
114 | ||
115 | nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE); | |
116 | ||
117 | for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++) | |
118 | set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]); | |
119 | ||
120 | kfree(save_pgd); | |
121 | ||
122 | __flush_tlb_all(); | |
123 | early_code_mapping_set_exec(0); | |
124 | } | |
125 | ||
126 | static pgd_t *efi_pgd; | |
127 | ||
128 | /* | |
129 | * We need our own copy of the higher levels of the page tables | |
130 | * because we want to avoid inserting EFI region mappings (EFI_VA_END | |
131 | * to EFI_VA_START) into the standard kernel page tables. Everything | |
132 | * else can be shared, see efi_sync_low_kernel_mappings(). | |
133 | */ | |
134 | int __init efi_alloc_page_tables(void) | |
135 | { | |
136 | pgd_t *pgd; | |
137 | pud_t *pud; | |
138 | gfp_t gfp_mask; | |
139 | ||
140 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
141 | return 0; | |
142 | ||
143 | gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO; | |
144 | efi_pgd = (pgd_t *)__get_free_page(gfp_mask); | |
145 | if (!efi_pgd) | |
146 | return -ENOMEM; | |
147 | ||
148 | pgd = efi_pgd + pgd_index(EFI_VA_END); | |
149 | ||
150 | pud = pud_alloc_one(NULL, 0); | |
151 | if (!pud) { | |
152 | free_page((unsigned long)efi_pgd); | |
153 | return -ENOMEM; | |
154 | } | |
155 | ||
156 | pgd_populate(NULL, pgd, pud); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | /* | |
162 | * Add low kernel mappings for passing arguments to EFI functions. | |
163 | */ | |
164 | void efi_sync_low_kernel_mappings(void) | |
165 | { | |
166 | unsigned num_entries; | |
167 | pgd_t *pgd_k, *pgd_efi; | |
168 | pud_t *pud_k, *pud_efi; | |
169 | ||
170 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
171 | return; | |
172 | ||
173 | /* | |
174 | * We can share all PGD entries apart from the one entry that | |
175 | * covers the EFI runtime mapping space. | |
176 | * | |
177 | * Make sure the EFI runtime region mappings are guaranteed to | |
178 | * only span a single PGD entry and that the entry also maps | |
179 | * other important kernel regions. | |
180 | */ | |
181 | BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END)); | |
182 | BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) != | |
183 | (EFI_VA_END & PGDIR_MASK)); | |
184 | ||
185 | pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET); | |
186 | pgd_k = pgd_offset_k(PAGE_OFFSET); | |
187 | ||
188 | num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET); | |
189 | memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries); | |
190 | ||
191 | /* | |
192 | * We share all the PUD entries apart from those that map the | |
193 | * EFI regions. Copy around them. | |
194 | */ | |
195 | BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0); | |
196 | BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0); | |
197 | ||
198 | pgd_efi = efi_pgd + pgd_index(EFI_VA_END); | |
199 | pud_efi = pud_offset(pgd_efi, 0); | |
200 | ||
201 | pgd_k = pgd_offset_k(EFI_VA_END); | |
202 | pud_k = pud_offset(pgd_k, 0); | |
203 | ||
204 | num_entries = pud_index(EFI_VA_END); | |
205 | memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries); | |
206 | ||
207 | pud_efi = pud_offset(pgd_efi, EFI_VA_START); | |
208 | pud_k = pud_offset(pgd_k, EFI_VA_START); | |
209 | ||
210 | num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START); | |
211 | memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries); | |
212 | } | |
213 | ||
214 | int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) | |
215 | { | |
216 | unsigned long pfn, text; | |
217 | struct page *page; | |
218 | unsigned npages; | |
219 | pgd_t *pgd; | |
220 | ||
221 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
222 | return 0; | |
223 | ||
224 | efi_scratch.efi_pgt = (pgd_t *)__pa(efi_pgd); | |
225 | pgd = efi_pgd; | |
226 | ||
227 | /* | |
228 | * It can happen that the physical address of new_memmap lands in memory | |
229 | * which is not mapped in the EFI page table. Therefore we need to go | |
230 | * and ident-map those pages containing the map before calling | |
231 | * phys_efi_set_virtual_address_map(). | |
232 | */ | |
233 | pfn = pa_memmap >> PAGE_SHIFT; | |
234 | if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX | _PAGE_RW)) { | |
235 | pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap); | |
236 | return 1; | |
237 | } | |
238 | ||
239 | efi_scratch.use_pgd = true; | |
240 | ||
241 | /* | |
242 | * When making calls to the firmware everything needs to be 1:1 | |
243 | * mapped and addressable with 32-bit pointers. Map the kernel | |
244 | * text and allocate a new stack because we can't rely on the | |
245 | * stack pointer being < 4GB. | |
246 | */ | |
247 | if (!IS_ENABLED(CONFIG_EFI_MIXED)) | |
248 | return 0; | |
249 | ||
250 | page = alloc_page(GFP_KERNEL|__GFP_DMA32); | |
251 | if (!page) | |
252 | panic("Unable to allocate EFI runtime stack < 4GB\n"); | |
253 | ||
254 | efi_scratch.phys_stack = virt_to_phys(page_address(page)); | |
255 | efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */ | |
256 | ||
257 | npages = (_etext - _text) >> PAGE_SHIFT; | |
258 | text = __pa(_text); | |
259 | pfn = text >> PAGE_SHIFT; | |
260 | ||
261 | if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, _PAGE_RW)) { | |
262 | pr_err("Failed to map kernel text 1:1\n"); | |
263 | return 1; | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static void __init __map_region(efi_memory_desc_t *md, u64 va) | |
270 | { | |
271 | unsigned long flags = _PAGE_RW; | |
272 | unsigned long pfn; | |
273 | pgd_t *pgd = efi_pgd; | |
274 | ||
275 | if (!(md->attribute & EFI_MEMORY_WB)) | |
276 | flags |= _PAGE_PCD; | |
277 | ||
278 | pfn = md->phys_addr >> PAGE_SHIFT; | |
279 | if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags)) | |
280 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", | |
281 | md->phys_addr, va); | |
282 | } | |
283 | ||
284 | void __init efi_map_region(efi_memory_desc_t *md) | |
285 | { | |
286 | unsigned long size = md->num_pages << PAGE_SHIFT; | |
287 | u64 pa = md->phys_addr; | |
288 | ||
289 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
290 | return old_map_region(md); | |
291 | ||
292 | /* | |
293 | * Make sure the 1:1 mappings are present as a catch-all for b0rked | |
294 | * firmware which doesn't update all internal pointers after switching | |
295 | * to virtual mode and would otherwise crap on us. | |
296 | */ | |
297 | __map_region(md, md->phys_addr); | |
298 | ||
299 | /* | |
300 | * Enforce the 1:1 mapping as the default virtual address when | |
301 | * booting in EFI mixed mode, because even though we may be | |
302 | * running a 64-bit kernel, the firmware may only be 32-bit. | |
303 | */ | |
304 | if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) { | |
305 | md->virt_addr = md->phys_addr; | |
306 | return; | |
307 | } | |
308 | ||
309 | efi_va -= size; | |
310 | ||
311 | /* Is PA 2M-aligned? */ | |
312 | if (!(pa & (PMD_SIZE - 1))) { | |
313 | efi_va &= PMD_MASK; | |
314 | } else { | |
315 | u64 pa_offset = pa & (PMD_SIZE - 1); | |
316 | u64 prev_va = efi_va; | |
317 | ||
318 | /* get us the same offset within this 2M page */ | |
319 | efi_va = (efi_va & PMD_MASK) + pa_offset; | |
320 | ||
321 | if (efi_va > prev_va) | |
322 | efi_va -= PMD_SIZE; | |
323 | } | |
324 | ||
325 | if (efi_va < EFI_VA_END) { | |
326 | pr_warn(FW_WARN "VA address range overflow!\n"); | |
327 | return; | |
328 | } | |
329 | ||
330 | /* Do the VA map */ | |
331 | __map_region(md, efi_va); | |
332 | md->virt_addr = efi_va; | |
333 | } | |
334 | ||
335 | /* | |
336 | * kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges. | |
337 | * md->virt_addr is the original virtual address which had been mapped in kexec | |
338 | * 1st kernel. | |
339 | */ | |
340 | void __init efi_map_region_fixed(efi_memory_desc_t *md) | |
341 | { | |
342 | __map_region(md, md->virt_addr); | |
343 | } | |
344 | ||
345 | void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size, | |
346 | u32 type, u64 attribute) | |
347 | { | |
348 | unsigned long last_map_pfn; | |
349 | ||
350 | if (type == EFI_MEMORY_MAPPED_IO) | |
351 | return ioremap(phys_addr, size); | |
352 | ||
353 | last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size); | |
354 | if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) { | |
355 | unsigned long top = last_map_pfn << PAGE_SHIFT; | |
356 | efi_ioremap(top, size - (top - phys_addr), type, attribute); | |
357 | } | |
358 | ||
359 | if (!(attribute & EFI_MEMORY_WB)) | |
360 | efi_memory_uc((u64)(unsigned long)__va(phys_addr), size); | |
361 | ||
362 | return (void __iomem *)__va(phys_addr); | |
363 | } | |
364 | ||
365 | void __init parse_efi_setup(u64 phys_addr, u32 data_len) | |
366 | { | |
367 | efi_setup = phys_addr + sizeof(struct setup_data); | |
368 | } | |
369 | ||
370 | void __init efi_runtime_update_mappings(void) | |
371 | { | |
372 | unsigned long pfn; | |
373 | pgd_t *pgd = efi_pgd; | |
374 | efi_memory_desc_t *md; | |
375 | ||
376 | if (efi_enabled(EFI_OLD_MEMMAP)) { | |
377 | if (__supported_pte_mask & _PAGE_NX) | |
378 | runtime_code_page_mkexec(); | |
379 | return; | |
380 | } | |
381 | ||
382 | if (!efi_enabled(EFI_NX_PE_DATA)) | |
383 | return; | |
384 | ||
385 | for_each_efi_memory_desc(md) { | |
386 | unsigned long pf = 0; | |
387 | ||
388 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) | |
389 | continue; | |
390 | ||
391 | if (!(md->attribute & EFI_MEMORY_WB)) | |
392 | pf |= _PAGE_PCD; | |
393 | ||
394 | if ((md->attribute & EFI_MEMORY_XP) || | |
395 | (md->type == EFI_RUNTIME_SERVICES_DATA)) | |
396 | pf |= _PAGE_NX; | |
397 | ||
398 | if (!(md->attribute & EFI_MEMORY_RO) && | |
399 | (md->type != EFI_RUNTIME_SERVICES_CODE)) | |
400 | pf |= _PAGE_RW; | |
401 | ||
402 | /* Update the 1:1 mapping */ | |
403 | pfn = md->phys_addr >> PAGE_SHIFT; | |
404 | if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf)) | |
405 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", | |
406 | md->phys_addr, md->virt_addr); | |
407 | ||
408 | if (kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf)) | |
409 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", | |
410 | md->phys_addr, md->virt_addr); | |
411 | } | |
412 | } | |
413 | ||
414 | void __init efi_dump_pagetable(void) | |
415 | { | |
416 | #ifdef CONFIG_EFI_PGT_DUMP | |
417 | ptdump_walk_pgd_level(NULL, efi_pgd); | |
418 | #endif | |
419 | } | |
420 | ||
421 | #ifdef CONFIG_EFI_MIXED | |
422 | extern efi_status_t efi64_thunk(u32, ...); | |
423 | ||
424 | #define runtime_service32(func) \ | |
425 | ({ \ | |
426 | u32 table = (u32)(unsigned long)efi.systab; \ | |
427 | u32 *rt, *___f; \ | |
428 | \ | |
429 | rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime)); \ | |
430 | ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \ | |
431 | *___f; \ | |
432 | }) | |
433 | ||
434 | /* | |
435 | * Switch to the EFI page tables early so that we can access the 1:1 | |
436 | * runtime services mappings which are not mapped in any other page | |
437 | * tables. This function must be called before runtime_service32(). | |
438 | * | |
439 | * Also, disable interrupts because the IDT points to 64-bit handlers, | |
440 | * which aren't going to function correctly when we switch to 32-bit. | |
441 | */ | |
442 | #define efi_thunk(f, ...) \ | |
443 | ({ \ | |
444 | efi_status_t __s; \ | |
445 | unsigned long __flags; \ | |
446 | u32 __func; \ | |
447 | \ | |
448 | local_irq_save(__flags); \ | |
449 | arch_efi_call_virt_setup(); \ | |
450 | \ | |
451 | __func = runtime_service32(f); \ | |
452 | __s = efi64_thunk(__func, __VA_ARGS__); \ | |
453 | \ | |
454 | arch_efi_call_virt_teardown(); \ | |
455 | local_irq_restore(__flags); \ | |
456 | \ | |
457 | __s; \ | |
458 | }) | |
459 | ||
460 | efi_status_t efi_thunk_set_virtual_address_map( | |
461 | void *phys_set_virtual_address_map, | |
462 | unsigned long memory_map_size, | |
463 | unsigned long descriptor_size, | |
464 | u32 descriptor_version, | |
465 | efi_memory_desc_t *virtual_map) | |
466 | { | |
467 | efi_status_t status; | |
468 | unsigned long flags; | |
469 | u32 func; | |
470 | ||
471 | efi_sync_low_kernel_mappings(); | |
472 | local_irq_save(flags); | |
473 | ||
474 | efi_scratch.prev_cr3 = read_cr3(); | |
475 | write_cr3((unsigned long)efi_scratch.efi_pgt); | |
476 | __flush_tlb_all(); | |
477 | ||
478 | func = (u32)(unsigned long)phys_set_virtual_address_map; | |
479 | status = efi64_thunk(func, memory_map_size, descriptor_size, | |
480 | descriptor_version, virtual_map); | |
481 | ||
482 | write_cr3(efi_scratch.prev_cr3); | |
483 | __flush_tlb_all(); | |
484 | local_irq_restore(flags); | |
485 | ||
486 | return status; | |
487 | } | |
488 | ||
489 | static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc) | |
490 | { | |
491 | efi_status_t status; | |
492 | u32 phys_tm, phys_tc; | |
493 | ||
494 | spin_lock(&rtc_lock); | |
495 | ||
496 | phys_tm = virt_to_phys(tm); | |
497 | phys_tc = virt_to_phys(tc); | |
498 | ||
499 | status = efi_thunk(get_time, phys_tm, phys_tc); | |
500 | ||
501 | spin_unlock(&rtc_lock); | |
502 | ||
503 | return status; | |
504 | } | |
505 | ||
506 | static efi_status_t efi_thunk_set_time(efi_time_t *tm) | |
507 | { | |
508 | efi_status_t status; | |
509 | u32 phys_tm; | |
510 | ||
511 | spin_lock(&rtc_lock); | |
512 | ||
513 | phys_tm = virt_to_phys(tm); | |
514 | ||
515 | status = efi_thunk(set_time, phys_tm); | |
516 | ||
517 | spin_unlock(&rtc_lock); | |
518 | ||
519 | return status; | |
520 | } | |
521 | ||
522 | static efi_status_t | |
523 | efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending, | |
524 | efi_time_t *tm) | |
525 | { | |
526 | efi_status_t status; | |
527 | u32 phys_enabled, phys_pending, phys_tm; | |
528 | ||
529 | spin_lock(&rtc_lock); | |
530 | ||
531 | phys_enabled = virt_to_phys(enabled); | |
532 | phys_pending = virt_to_phys(pending); | |
533 | phys_tm = virt_to_phys(tm); | |
534 | ||
535 | status = efi_thunk(get_wakeup_time, phys_enabled, | |
536 | phys_pending, phys_tm); | |
537 | ||
538 | spin_unlock(&rtc_lock); | |
539 | ||
540 | return status; | |
541 | } | |
542 | ||
543 | static efi_status_t | |
544 | efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
545 | { | |
546 | efi_status_t status; | |
547 | u32 phys_tm; | |
548 | ||
549 | spin_lock(&rtc_lock); | |
550 | ||
551 | phys_tm = virt_to_phys(tm); | |
552 | ||
553 | status = efi_thunk(set_wakeup_time, enabled, phys_tm); | |
554 | ||
555 | spin_unlock(&rtc_lock); | |
556 | ||
557 | return status; | |
558 | } | |
559 | ||
560 | ||
561 | static efi_status_t | |
562 | efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor, | |
563 | u32 *attr, unsigned long *data_size, void *data) | |
564 | { | |
565 | efi_status_t status; | |
566 | u32 phys_name, phys_vendor, phys_attr; | |
567 | u32 phys_data_size, phys_data; | |
568 | ||
569 | phys_data_size = virt_to_phys(data_size); | |
570 | phys_vendor = virt_to_phys(vendor); | |
571 | phys_name = virt_to_phys(name); | |
572 | phys_attr = virt_to_phys(attr); | |
573 | phys_data = virt_to_phys(data); | |
574 | ||
575 | status = efi_thunk(get_variable, phys_name, phys_vendor, | |
576 | phys_attr, phys_data_size, phys_data); | |
577 | ||
578 | return status; | |
579 | } | |
580 | ||
581 | static efi_status_t | |
582 | efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor, | |
583 | u32 attr, unsigned long data_size, void *data) | |
584 | { | |
585 | u32 phys_name, phys_vendor, phys_data; | |
586 | efi_status_t status; | |
587 | ||
588 | phys_name = virt_to_phys(name); | |
589 | phys_vendor = virt_to_phys(vendor); | |
590 | phys_data = virt_to_phys(data); | |
591 | ||
592 | /* If data_size is > sizeof(u32) we've got problems */ | |
593 | status = efi_thunk(set_variable, phys_name, phys_vendor, | |
594 | attr, data_size, phys_data); | |
595 | ||
596 | return status; | |
597 | } | |
598 | ||
599 | static efi_status_t | |
600 | efi_thunk_get_next_variable(unsigned long *name_size, | |
601 | efi_char16_t *name, | |
602 | efi_guid_t *vendor) | |
603 | { | |
604 | efi_status_t status; | |
605 | u32 phys_name_size, phys_name, phys_vendor; | |
606 | ||
607 | phys_name_size = virt_to_phys(name_size); | |
608 | phys_vendor = virt_to_phys(vendor); | |
609 | phys_name = virt_to_phys(name); | |
610 | ||
611 | status = efi_thunk(get_next_variable, phys_name_size, | |
612 | phys_name, phys_vendor); | |
613 | ||
614 | return status; | |
615 | } | |
616 | ||
617 | static efi_status_t | |
618 | efi_thunk_get_next_high_mono_count(u32 *count) | |
619 | { | |
620 | efi_status_t status; | |
621 | u32 phys_count; | |
622 | ||
623 | phys_count = virt_to_phys(count); | |
624 | status = efi_thunk(get_next_high_mono_count, phys_count); | |
625 | ||
626 | return status; | |
627 | } | |
628 | ||
629 | static void | |
630 | efi_thunk_reset_system(int reset_type, efi_status_t status, | |
631 | unsigned long data_size, efi_char16_t *data) | |
632 | { | |
633 | u32 phys_data; | |
634 | ||
635 | phys_data = virt_to_phys(data); | |
636 | ||
637 | efi_thunk(reset_system, reset_type, status, data_size, phys_data); | |
638 | } | |
639 | ||
640 | static efi_status_t | |
641 | efi_thunk_update_capsule(efi_capsule_header_t **capsules, | |
642 | unsigned long count, unsigned long sg_list) | |
643 | { | |
644 | /* | |
645 | * To properly support this function we would need to repackage | |
646 | * 'capsules' because the firmware doesn't understand 64-bit | |
647 | * pointers. | |
648 | */ | |
649 | return EFI_UNSUPPORTED; | |
650 | } | |
651 | ||
652 | static efi_status_t | |
653 | efi_thunk_query_variable_info(u32 attr, u64 *storage_space, | |
654 | u64 *remaining_space, | |
655 | u64 *max_variable_size) | |
656 | { | |
657 | efi_status_t status; | |
658 | u32 phys_storage, phys_remaining, phys_max; | |
659 | ||
660 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
661 | return EFI_UNSUPPORTED; | |
662 | ||
663 | phys_storage = virt_to_phys(storage_space); | |
664 | phys_remaining = virt_to_phys(remaining_space); | |
665 | phys_max = virt_to_phys(max_variable_size); | |
666 | ||
667 | status = efi_thunk(query_variable_info, attr, phys_storage, | |
668 | phys_remaining, phys_max); | |
669 | ||
670 | return status; | |
671 | } | |
672 | ||
673 | static efi_status_t | |
674 | efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules, | |
675 | unsigned long count, u64 *max_size, | |
676 | int *reset_type) | |
677 | { | |
678 | /* | |
679 | * To properly support this function we would need to repackage | |
680 | * 'capsules' because the firmware doesn't understand 64-bit | |
681 | * pointers. | |
682 | */ | |
683 | return EFI_UNSUPPORTED; | |
684 | } | |
685 | ||
686 | void efi_thunk_runtime_setup(void) | |
687 | { | |
688 | efi.get_time = efi_thunk_get_time; | |
689 | efi.set_time = efi_thunk_set_time; | |
690 | efi.get_wakeup_time = efi_thunk_get_wakeup_time; | |
691 | efi.set_wakeup_time = efi_thunk_set_wakeup_time; | |
692 | efi.get_variable = efi_thunk_get_variable; | |
693 | efi.get_next_variable = efi_thunk_get_next_variable; | |
694 | efi.set_variable = efi_thunk_set_variable; | |
695 | efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count; | |
696 | efi.reset_system = efi_thunk_reset_system; | |
697 | efi.query_variable_info = efi_thunk_query_variable_info; | |
698 | efi.update_capsule = efi_thunk_update_capsule; | |
699 | efi.query_capsule_caps = efi_thunk_query_capsule_caps; | |
700 | } | |
701 | #endif /* CONFIG_EFI_MIXED */ |