Commit | Line | Data |
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5b83683f HY |
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 | ||
26d7f65f MF |
18 | #define pr_fmt(fmt) "efi: " fmt |
19 | ||
5b83683f HY |
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> | |
cc3ae7b0 | 27 | #include <linux/init.h> |
5ab788d7 | 28 | #include <linux/mc146818rtc.h> |
5b83683f HY |
29 | #include <linux/efi.h> |
30 | #include <linux/uaccess.h> | |
31 | #include <linux/io.h> | |
32 | #include <linux/reboot.h> | |
0d01ff25 | 33 | #include <linux/slab.h> |
5b83683f HY |
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> | |
5b83683f HY |
40 | #include <asm/proto.h> |
41 | #include <asm/efi.h> | |
4de0d4a6 | 42 | #include <asm/cacheflush.h> |
3819cd48 | 43 | #include <asm/fixmap.h> |
d2f7cbe7 | 44 | #include <asm/realmode.h> |
4f9dbcfc | 45 | #include <asm/time.h> |
67a9108e | 46 | #include <asm/pgalloc.h> |
5b83683f | 47 | |
d2f7cbe7 BP |
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 | */ | |
8266e31e | 52 | static u64 efi_va = EFI_VA_START; |
d2f7cbe7 | 53 | |
c9f2a9a6 | 54 | struct efi_scratch efi_scratch; |
d2f7cbe7 | 55 | |
9cd2b07c | 56 | static void __init early_code_mapping_set_exec(int executable) |
5b83683f HY |
57 | { |
58 | efi_memory_desc_t *md; | |
5b83683f | 59 | |
a2172e25 HY |
60 | if (!(__supported_pte_mask & _PAGE_NX)) |
61 | return; | |
62 | ||
916f676f | 63 | /* Make EFI service code area executable */ |
78ce248f | 64 | for_each_efi_memory_desc(md) { |
916f676f MG |
65 | if (md->type == EFI_RUNTIME_SERVICES_CODE || |
66 | md->type == EFI_BOOT_SERVICES_CODE) | |
9cd2b07c | 67 | efi_set_executable(md, executable); |
5b83683f HY |
68 | } |
69 | } | |
70 | ||
744937b0 | 71 | pgd_t * __init efi_call_phys_prolog(void) |
5b83683f HY |
72 | { |
73 | unsigned long vaddress; | |
744937b0 IM |
74 | pgd_t *save_pgd; |
75 | ||
b8f2c21d NZ |
76 | int pgd; |
77 | int n_pgds; | |
5b83683f | 78 | |
c9f2a9a6 MF |
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 | } | |
d2f7cbe7 | 84 | |
9cd2b07c | 85 | early_code_mapping_set_exec(1); |
b8f2c21d NZ |
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 | } | |
c9f2a9a6 | 95 | out: |
5b83683f | 96 | __flush_tlb_all(); |
744937b0 IM |
97 | |
98 | return save_pgd; | |
5b83683f HY |
99 | } |
100 | ||
744937b0 | 101 | void __init efi_call_phys_epilog(pgd_t *save_pgd) |
5b83683f HY |
102 | { |
103 | /* | |
104 | * After the lock is released, the original page table is restored. | |
105 | */ | |
744937b0 IM |
106 | int pgd_idx; |
107 | int nr_pgds; | |
d2f7cbe7 | 108 | |
c9f2a9a6 MF |
109 | if (!efi_enabled(EFI_OLD_MEMMAP)) { |
110 | write_cr3((unsigned long)save_pgd); | |
111 | __flush_tlb_all(); | |
d2f7cbe7 | 112 | return; |
c9f2a9a6 | 113 | } |
d2f7cbe7 | 114 | |
744937b0 IM |
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 | ||
b8f2c21d | 120 | kfree(save_pgd); |
744937b0 | 121 | |
5b83683f | 122 | __flush_tlb_all(); |
9cd2b07c | 123 | early_code_mapping_set_exec(0); |
5b83683f | 124 | } |
e1ad783b | 125 | |
67a9108e MF |
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 | ||
f58f230a | 143 | gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO; |
67a9108e MF |
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 | ||
d2f7cbe7 BP |
161 | /* |
162 | * Add low kernel mappings for passing arguments to EFI functions. | |
163 | */ | |
164 | void efi_sync_low_kernel_mappings(void) | |
165 | { | |
67a9108e MF |
166 | unsigned num_entries; |
167 | pgd_t *pgd_k, *pgd_efi; | |
168 | pud_t *pud_k, *pud_efi; | |
d2f7cbe7 BP |
169 | |
170 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
171 | return; | |
172 | ||
67a9108e MF |
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); | |
d2f7cbe7 | 190 | |
67a9108e MF |
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); | |
d2f7cbe7 BP |
212 | } |
213 | ||
4e78eb05 | 214 | int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) |
d2f7cbe7 | 215 | { |
edc3b912 | 216 | unsigned long pfn, text; |
b61a76f8 | 217 | efi_memory_desc_t *md; |
4f9dbcfc | 218 | struct page *page; |
994448f1 | 219 | unsigned npages; |
b7b898ae BP |
220 | pgd_t *pgd; |
221 | ||
222 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
223 | return 0; | |
224 | ||
67a9108e MF |
225 | efi_scratch.efi_pgt = (pgd_t *)__pa(efi_pgd); |
226 | pgd = efi_pgd; | |
d2f7cbe7 | 227 | |
b7b898ae BP |
228 | /* |
229 | * It can happen that the physical address of new_memmap lands in memory | |
230 | * which is not mapped in the EFI page table. Therefore we need to go | |
231 | * and ident-map those pages containing the map before calling | |
232 | * phys_efi_set_virtual_address_map(). | |
233 | */ | |
edc3b912 | 234 | pfn = pa_memmap >> PAGE_SHIFT; |
15f003d2 | 235 | if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX | _PAGE_RW)) { |
b7b898ae BP |
236 | pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap); |
237 | return 1; | |
238 | } | |
239 | ||
240 | efi_scratch.use_pgd = true; | |
241 | ||
4f9dbcfc MF |
242 | /* |
243 | * When making calls to the firmware everything needs to be 1:1 | |
244 | * mapped and addressable with 32-bit pointers. Map the kernel | |
245 | * text and allocate a new stack because we can't rely on the | |
246 | * stack pointer being < 4GB. | |
247 | */ | |
248 | if (!IS_ENABLED(CONFIG_EFI_MIXED)) | |
994448f1 | 249 | return 0; |
4f9dbcfc | 250 | |
b61a76f8 MF |
251 | /* |
252 | * Map all of RAM so that we can access arguments in the 1:1 | |
253 | * mapping when making EFI runtime calls. | |
254 | */ | |
78ce248f | 255 | for_each_efi_memory_desc(md) { |
b61a76f8 MF |
256 | if (md->type != EFI_CONVENTIONAL_MEMORY && |
257 | md->type != EFI_LOADER_DATA && | |
258 | md->type != EFI_LOADER_CODE) | |
259 | continue; | |
260 | ||
261 | pfn = md->phys_addr >> PAGE_SHIFT; | |
262 | npages = md->num_pages; | |
263 | ||
15f003d2 | 264 | if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, npages, _PAGE_RW)) { |
b61a76f8 MF |
265 | pr_err("Failed to map 1:1 memory\n"); |
266 | return 1; | |
267 | } | |
268 | } | |
269 | ||
4f9dbcfc MF |
270 | page = alloc_page(GFP_KERNEL|__GFP_DMA32); |
271 | if (!page) | |
272 | panic("Unable to allocate EFI runtime stack < 4GB\n"); | |
273 | ||
274 | efi_scratch.phys_stack = virt_to_phys(page_address(page)); | |
275 | efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */ | |
276 | ||
2ad510dc | 277 | npages = (_etext - _text) >> PAGE_SHIFT; |
4f9dbcfc | 278 | text = __pa(_text); |
edc3b912 | 279 | pfn = text >> PAGE_SHIFT; |
4f9dbcfc | 280 | |
15f003d2 | 281 | if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, _PAGE_RW)) { |
4f9dbcfc | 282 | pr_err("Failed to map kernel text 1:1\n"); |
994448f1 | 283 | return 1; |
4f9dbcfc | 284 | } |
b7b898ae BP |
285 | |
286 | return 0; | |
287 | } | |
288 | ||
d2f7cbe7 BP |
289 | static void __init __map_region(efi_memory_desc_t *md, u64 va) |
290 | { | |
15f003d2 | 291 | unsigned long flags = _PAGE_RW; |
edc3b912 | 292 | unsigned long pfn; |
67a9108e | 293 | pgd_t *pgd = efi_pgd; |
d2f7cbe7 BP |
294 | |
295 | if (!(md->attribute & EFI_MEMORY_WB)) | |
edc3b912 | 296 | flags |= _PAGE_PCD; |
d2f7cbe7 | 297 | |
edc3b912 MF |
298 | pfn = md->phys_addr >> PAGE_SHIFT; |
299 | if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags)) | |
d2f7cbe7 BP |
300 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", |
301 | md->phys_addr, va); | |
302 | } | |
303 | ||
304 | void __init efi_map_region(efi_memory_desc_t *md) | |
305 | { | |
306 | unsigned long size = md->num_pages << PAGE_SHIFT; | |
307 | u64 pa = md->phys_addr; | |
308 | ||
309 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
310 | return old_map_region(md); | |
311 | ||
312 | /* | |
313 | * Make sure the 1:1 mappings are present as a catch-all for b0rked | |
314 | * firmware which doesn't update all internal pointers after switching | |
315 | * to virtual mode and would otherwise crap on us. | |
316 | */ | |
317 | __map_region(md, md->phys_addr); | |
318 | ||
4f9dbcfc MF |
319 | /* |
320 | * Enforce the 1:1 mapping as the default virtual address when | |
321 | * booting in EFI mixed mode, because even though we may be | |
322 | * running a 64-bit kernel, the firmware may only be 32-bit. | |
323 | */ | |
324 | if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) { | |
325 | md->virt_addr = md->phys_addr; | |
326 | return; | |
327 | } | |
328 | ||
d2f7cbe7 BP |
329 | efi_va -= size; |
330 | ||
331 | /* Is PA 2M-aligned? */ | |
332 | if (!(pa & (PMD_SIZE - 1))) { | |
333 | efi_va &= PMD_MASK; | |
334 | } else { | |
335 | u64 pa_offset = pa & (PMD_SIZE - 1); | |
336 | u64 prev_va = efi_va; | |
337 | ||
338 | /* get us the same offset within this 2M page */ | |
339 | efi_va = (efi_va & PMD_MASK) + pa_offset; | |
340 | ||
341 | if (efi_va > prev_va) | |
342 | efi_va -= PMD_SIZE; | |
343 | } | |
344 | ||
345 | if (efi_va < EFI_VA_END) { | |
346 | pr_warn(FW_WARN "VA address range overflow!\n"); | |
347 | return; | |
348 | } | |
349 | ||
350 | /* Do the VA map */ | |
351 | __map_region(md, efi_va); | |
352 | md->virt_addr = efi_va; | |
353 | } | |
354 | ||
3b266496 DY |
355 | /* |
356 | * kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges. | |
357 | * md->virt_addr is the original virtual address which had been mapped in kexec | |
358 | * 1st kernel. | |
359 | */ | |
360 | void __init efi_map_region_fixed(efi_memory_desc_t *md) | |
361 | { | |
362 | __map_region(md, md->virt_addr); | |
363 | } | |
364 | ||
e1ad783b | 365 | void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size, |
3e8fa263 | 366 | u32 type, u64 attribute) |
e1ad783b KP |
367 | { |
368 | unsigned long last_map_pfn; | |
369 | ||
370 | if (type == EFI_MEMORY_MAPPED_IO) | |
371 | return ioremap(phys_addr, size); | |
372 | ||
373 | last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size); | |
374 | if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) { | |
375 | unsigned long top = last_map_pfn << PAGE_SHIFT; | |
3e8fa263 | 376 | efi_ioremap(top, size - (top - phys_addr), type, attribute); |
e1ad783b KP |
377 | } |
378 | ||
3e8fa263 MF |
379 | if (!(attribute & EFI_MEMORY_WB)) |
380 | efi_memory_uc((u64)(unsigned long)__va(phys_addr), size); | |
381 | ||
e1ad783b KP |
382 | return (void __iomem *)__va(phys_addr); |
383 | } | |
1fec0533 DY |
384 | |
385 | void __init parse_efi_setup(u64 phys_addr, u32 data_len) | |
386 | { | |
387 | efi_setup = phys_addr + sizeof(struct setup_data); | |
1fec0533 | 388 | } |
c55d016f | 389 | |
6d0cc887 | 390 | void __init efi_runtime_update_mappings(void) |
c55d016f | 391 | { |
6d0cc887 SP |
392 | unsigned long pfn; |
393 | pgd_t *pgd = efi_pgd; | |
394 | efi_memory_desc_t *md; | |
6d0cc887 SP |
395 | |
396 | if (efi_enabled(EFI_OLD_MEMMAP)) { | |
397 | if (__supported_pte_mask & _PAGE_NX) | |
398 | runtime_code_page_mkexec(); | |
399 | return; | |
400 | } | |
401 | ||
402 | if (!efi_enabled(EFI_NX_PE_DATA)) | |
c55d016f BP |
403 | return; |
404 | ||
78ce248f | 405 | for_each_efi_memory_desc(md) { |
6d0cc887 | 406 | unsigned long pf = 0; |
6d0cc887 SP |
407 | |
408 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) | |
409 | continue; | |
410 | ||
411 | if (!(md->attribute & EFI_MEMORY_WB)) | |
412 | pf |= _PAGE_PCD; | |
413 | ||
414 | if ((md->attribute & EFI_MEMORY_XP) || | |
415 | (md->type == EFI_RUNTIME_SERVICES_DATA)) | |
416 | pf |= _PAGE_NX; | |
417 | ||
418 | if (!(md->attribute & EFI_MEMORY_RO) && | |
419 | (md->type != EFI_RUNTIME_SERVICES_CODE)) | |
420 | pf |= _PAGE_RW; | |
421 | ||
422 | /* Update the 1:1 mapping */ | |
423 | pfn = md->phys_addr >> PAGE_SHIFT; | |
424 | if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf)) | |
425 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", | |
426 | md->phys_addr, md->virt_addr); | |
427 | ||
428 | if (kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf)) | |
429 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", | |
430 | md->phys_addr, md->virt_addr); | |
431 | } | |
c55d016f | 432 | } |
11cc8512 BP |
433 | |
434 | void __init efi_dump_pagetable(void) | |
435 | { | |
436 | #ifdef CONFIG_EFI_PGT_DUMP | |
67a9108e | 437 | ptdump_walk_pgd_level(NULL, efi_pgd); |
11cc8512 BP |
438 | #endif |
439 | } | |
994448f1 | 440 | |
4f9dbcfc MF |
441 | #ifdef CONFIG_EFI_MIXED |
442 | extern efi_status_t efi64_thunk(u32, ...); | |
443 | ||
444 | #define runtime_service32(func) \ | |
445 | ({ \ | |
446 | u32 table = (u32)(unsigned long)efi.systab; \ | |
447 | u32 *rt, *___f; \ | |
448 | \ | |
449 | rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime)); \ | |
450 | ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \ | |
451 | *___f; \ | |
452 | }) | |
453 | ||
454 | /* | |
455 | * Switch to the EFI page tables early so that we can access the 1:1 | |
456 | * runtime services mappings which are not mapped in any other page | |
457 | * tables. This function must be called before runtime_service32(). | |
458 | * | |
459 | * Also, disable interrupts because the IDT points to 64-bit handlers, | |
460 | * which aren't going to function correctly when we switch to 32-bit. | |
461 | */ | |
462 | #define efi_thunk(f, ...) \ | |
463 | ({ \ | |
464 | efi_status_t __s; \ | |
21f86625 AT |
465 | unsigned long __flags; \ |
466 | u32 __func; \ | |
4f9dbcfc | 467 | \ |
21f86625 AT |
468 | local_irq_save(__flags); \ |
469 | arch_efi_call_virt_setup(); \ | |
4f9dbcfc | 470 | \ |
21f86625 AT |
471 | __func = runtime_service32(f); \ |
472 | __s = efi64_thunk(__func, __VA_ARGS__); \ | |
4f9dbcfc | 473 | \ |
21f86625 AT |
474 | arch_efi_call_virt_teardown(); \ |
475 | local_irq_restore(__flags); \ | |
4f9dbcfc MF |
476 | \ |
477 | __s; \ | |
478 | }) | |
479 | ||
480 | efi_status_t efi_thunk_set_virtual_address_map( | |
481 | void *phys_set_virtual_address_map, | |
482 | unsigned long memory_map_size, | |
483 | unsigned long descriptor_size, | |
484 | u32 descriptor_version, | |
485 | efi_memory_desc_t *virtual_map) | |
486 | { | |
487 | efi_status_t status; | |
488 | unsigned long flags; | |
489 | u32 func; | |
490 | ||
491 | efi_sync_low_kernel_mappings(); | |
492 | local_irq_save(flags); | |
493 | ||
494 | efi_scratch.prev_cr3 = read_cr3(); | |
495 | write_cr3((unsigned long)efi_scratch.efi_pgt); | |
496 | __flush_tlb_all(); | |
497 | ||
498 | func = (u32)(unsigned long)phys_set_virtual_address_map; | |
499 | status = efi64_thunk(func, memory_map_size, descriptor_size, | |
500 | descriptor_version, virtual_map); | |
501 | ||
502 | write_cr3(efi_scratch.prev_cr3); | |
503 | __flush_tlb_all(); | |
504 | local_irq_restore(flags); | |
505 | ||
506 | return status; | |
507 | } | |
508 | ||
509 | static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc) | |
510 | { | |
511 | efi_status_t status; | |
512 | u32 phys_tm, phys_tc; | |
513 | ||
514 | spin_lock(&rtc_lock); | |
515 | ||
516 | phys_tm = virt_to_phys(tm); | |
517 | phys_tc = virt_to_phys(tc); | |
518 | ||
519 | status = efi_thunk(get_time, phys_tm, phys_tc); | |
520 | ||
521 | spin_unlock(&rtc_lock); | |
522 | ||
523 | return status; | |
524 | } | |
525 | ||
526 | static efi_status_t efi_thunk_set_time(efi_time_t *tm) | |
527 | { | |
528 | efi_status_t status; | |
529 | u32 phys_tm; | |
530 | ||
531 | spin_lock(&rtc_lock); | |
532 | ||
533 | phys_tm = virt_to_phys(tm); | |
534 | ||
535 | status = efi_thunk(set_time, phys_tm); | |
536 | ||
537 | spin_unlock(&rtc_lock); | |
538 | ||
539 | return status; | |
540 | } | |
541 | ||
542 | static efi_status_t | |
543 | efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending, | |
544 | efi_time_t *tm) | |
545 | { | |
546 | efi_status_t status; | |
547 | u32 phys_enabled, phys_pending, phys_tm; | |
548 | ||
549 | spin_lock(&rtc_lock); | |
550 | ||
551 | phys_enabled = virt_to_phys(enabled); | |
552 | phys_pending = virt_to_phys(pending); | |
553 | phys_tm = virt_to_phys(tm); | |
554 | ||
555 | status = efi_thunk(get_wakeup_time, phys_enabled, | |
556 | phys_pending, phys_tm); | |
557 | ||
558 | spin_unlock(&rtc_lock); | |
559 | ||
560 | return status; | |
561 | } | |
562 | ||
563 | static efi_status_t | |
564 | efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
565 | { | |
566 | efi_status_t status; | |
567 | u32 phys_tm; | |
568 | ||
569 | spin_lock(&rtc_lock); | |
570 | ||
571 | phys_tm = virt_to_phys(tm); | |
572 | ||
573 | status = efi_thunk(set_wakeup_time, enabled, phys_tm); | |
574 | ||
575 | spin_unlock(&rtc_lock); | |
576 | ||
577 | return status; | |
578 | } | |
579 | ||
580 | ||
581 | static efi_status_t | |
582 | efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor, | |
583 | u32 *attr, unsigned long *data_size, void *data) | |
584 | { | |
585 | efi_status_t status; | |
586 | u32 phys_name, phys_vendor, phys_attr; | |
587 | u32 phys_data_size, phys_data; | |
588 | ||
589 | phys_data_size = virt_to_phys(data_size); | |
590 | phys_vendor = virt_to_phys(vendor); | |
591 | phys_name = virt_to_phys(name); | |
592 | phys_attr = virt_to_phys(attr); | |
593 | phys_data = virt_to_phys(data); | |
594 | ||
595 | status = efi_thunk(get_variable, phys_name, phys_vendor, | |
596 | phys_attr, phys_data_size, phys_data); | |
597 | ||
598 | return status; | |
599 | } | |
600 | ||
601 | static efi_status_t | |
602 | efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor, | |
603 | u32 attr, unsigned long data_size, void *data) | |
604 | { | |
605 | u32 phys_name, phys_vendor, phys_data; | |
606 | efi_status_t status; | |
607 | ||
608 | phys_name = virt_to_phys(name); | |
609 | phys_vendor = virt_to_phys(vendor); | |
610 | phys_data = virt_to_phys(data); | |
611 | ||
612 | /* If data_size is > sizeof(u32) we've got problems */ | |
613 | status = efi_thunk(set_variable, phys_name, phys_vendor, | |
614 | attr, data_size, phys_data); | |
615 | ||
616 | return status; | |
617 | } | |
618 | ||
619 | static efi_status_t | |
620 | efi_thunk_get_next_variable(unsigned long *name_size, | |
621 | efi_char16_t *name, | |
622 | efi_guid_t *vendor) | |
623 | { | |
624 | efi_status_t status; | |
625 | u32 phys_name_size, phys_name, phys_vendor; | |
626 | ||
627 | phys_name_size = virt_to_phys(name_size); | |
628 | phys_vendor = virt_to_phys(vendor); | |
629 | phys_name = virt_to_phys(name); | |
630 | ||
631 | status = efi_thunk(get_next_variable, phys_name_size, | |
632 | phys_name, phys_vendor); | |
633 | ||
634 | return status; | |
635 | } | |
636 | ||
637 | static efi_status_t | |
638 | efi_thunk_get_next_high_mono_count(u32 *count) | |
639 | { | |
640 | efi_status_t status; | |
641 | u32 phys_count; | |
642 | ||
643 | phys_count = virt_to_phys(count); | |
644 | status = efi_thunk(get_next_high_mono_count, phys_count); | |
645 | ||
646 | return status; | |
647 | } | |
648 | ||
649 | static void | |
650 | efi_thunk_reset_system(int reset_type, efi_status_t status, | |
651 | unsigned long data_size, efi_char16_t *data) | |
652 | { | |
653 | u32 phys_data; | |
654 | ||
655 | phys_data = virt_to_phys(data); | |
656 | ||
657 | efi_thunk(reset_system, reset_type, status, data_size, phys_data); | |
658 | } | |
659 | ||
660 | static efi_status_t | |
661 | efi_thunk_update_capsule(efi_capsule_header_t **capsules, | |
662 | unsigned long count, unsigned long sg_list) | |
663 | { | |
664 | /* | |
665 | * To properly support this function we would need to repackage | |
666 | * 'capsules' because the firmware doesn't understand 64-bit | |
667 | * pointers. | |
668 | */ | |
669 | return EFI_UNSUPPORTED; | |
670 | } | |
671 | ||
672 | static efi_status_t | |
673 | efi_thunk_query_variable_info(u32 attr, u64 *storage_space, | |
674 | u64 *remaining_space, | |
675 | u64 *max_variable_size) | |
676 | { | |
677 | efi_status_t status; | |
678 | u32 phys_storage, phys_remaining, phys_max; | |
679 | ||
680 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
681 | return EFI_UNSUPPORTED; | |
682 | ||
683 | phys_storage = virt_to_phys(storage_space); | |
684 | phys_remaining = virt_to_phys(remaining_space); | |
685 | phys_max = virt_to_phys(max_variable_size); | |
686 | ||
9a11040f | 687 | status = efi_thunk(query_variable_info, attr, phys_storage, |
4f9dbcfc MF |
688 | phys_remaining, phys_max); |
689 | ||
690 | return status; | |
691 | } | |
692 | ||
693 | static efi_status_t | |
694 | efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules, | |
695 | unsigned long count, u64 *max_size, | |
696 | int *reset_type) | |
697 | { | |
698 | /* | |
699 | * To properly support this function we would need to repackage | |
700 | * 'capsules' because the firmware doesn't understand 64-bit | |
701 | * pointers. | |
702 | */ | |
703 | return EFI_UNSUPPORTED; | |
704 | } | |
705 | ||
706 | void efi_thunk_runtime_setup(void) | |
707 | { | |
708 | efi.get_time = efi_thunk_get_time; | |
709 | efi.set_time = efi_thunk_set_time; | |
710 | efi.get_wakeup_time = efi_thunk_get_wakeup_time; | |
711 | efi.set_wakeup_time = efi_thunk_set_wakeup_time; | |
712 | efi.get_variable = efi_thunk_get_variable; | |
713 | efi.get_next_variable = efi_thunk_get_next_variable; | |
714 | efi.set_variable = efi_thunk_set_variable; | |
715 | efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count; | |
716 | efi.reset_system = efi_thunk_reset_system; | |
717 | efi.query_variable_info = efi_thunk_query_variable_info; | |
718 | efi.update_capsule = efi_thunk_update_capsule; | |
719 | efi.query_capsule_caps = efi_thunk_query_capsule_caps; | |
720 | } | |
721 | #endif /* CONFIG_EFI_MIXED */ |