Commit | Line | Data |
---|---|---|
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> |
5b83683f HY |
28 | #include <linux/efi.h> |
29 | #include <linux/uaccess.h> | |
30 | #include <linux/io.h> | |
31 | #include <linux/reboot.h> | |
0d01ff25 | 32 | #include <linux/slab.h> |
5b83683f HY |
33 | |
34 | #include <asm/setup.h> | |
35 | #include <asm/page.h> | |
36 | #include <asm/e820.h> | |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/tlbflush.h> | |
5b83683f HY |
39 | #include <asm/proto.h> |
40 | #include <asm/efi.h> | |
4de0d4a6 | 41 | #include <asm/cacheflush.h> |
3819cd48 | 42 | #include <asm/fixmap.h> |
d2f7cbe7 | 43 | #include <asm/realmode.h> |
4f9dbcfc | 44 | #include <asm/time.h> |
67a9108e | 45 | #include <asm/pgalloc.h> |
5b83683f | 46 | |
d2f7cbe7 BP |
47 | /* |
48 | * We allocate runtime services regions bottom-up, starting from -4G, i.e. | |
49 | * 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G. | |
50 | */ | |
8266e31e | 51 | static u64 efi_va = EFI_VA_START; |
d2f7cbe7 | 52 | |
c9f2a9a6 | 53 | struct efi_scratch efi_scratch; |
d2f7cbe7 | 54 | |
9cd2b07c | 55 | static void __init early_code_mapping_set_exec(int executable) |
5b83683f HY |
56 | { |
57 | efi_memory_desc_t *md; | |
5b83683f | 58 | |
a2172e25 HY |
59 | if (!(__supported_pte_mask & _PAGE_NX)) |
60 | return; | |
61 | ||
916f676f | 62 | /* Make EFI service code area executable */ |
78ce248f | 63 | for_each_efi_memory_desc(md) { |
916f676f MG |
64 | if (md->type == EFI_RUNTIME_SERVICES_CODE || |
65 | md->type == EFI_BOOT_SERVICES_CODE) | |
9cd2b07c | 66 | efi_set_executable(md, executable); |
5b83683f HY |
67 | } |
68 | } | |
69 | ||
744937b0 | 70 | pgd_t * __init efi_call_phys_prolog(void) |
5b83683f HY |
71 | { |
72 | unsigned long vaddress; | |
744937b0 IM |
73 | pgd_t *save_pgd; |
74 | ||
b8f2c21d NZ |
75 | int pgd; |
76 | int n_pgds; | |
5b83683f | 77 | |
c9f2a9a6 MF |
78 | if (!efi_enabled(EFI_OLD_MEMMAP)) { |
79 | save_pgd = (pgd_t *)read_cr3(); | |
80 | write_cr3((unsigned long)efi_scratch.efi_pgt); | |
81 | goto out; | |
82 | } | |
d2f7cbe7 | 83 | |
9cd2b07c | 84 | early_code_mapping_set_exec(1); |
b8f2c21d NZ |
85 | |
86 | n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE); | |
87 | save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL); | |
88 | ||
89 | for (pgd = 0; pgd < n_pgds; pgd++) { | |
90 | save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE); | |
91 | vaddress = (unsigned long)__va(pgd * PGDIR_SIZE); | |
92 | set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress)); | |
93 | } | |
c9f2a9a6 | 94 | out: |
5b83683f | 95 | __flush_tlb_all(); |
744937b0 IM |
96 | |
97 | return save_pgd; | |
5b83683f HY |
98 | } |
99 | ||
744937b0 | 100 | void __init efi_call_phys_epilog(pgd_t *save_pgd) |
5b83683f HY |
101 | { |
102 | /* | |
103 | * After the lock is released, the original page table is restored. | |
104 | */ | |
744937b0 IM |
105 | int pgd_idx; |
106 | int nr_pgds; | |
d2f7cbe7 | 107 | |
c9f2a9a6 MF |
108 | if (!efi_enabled(EFI_OLD_MEMMAP)) { |
109 | write_cr3((unsigned long)save_pgd); | |
110 | __flush_tlb_all(); | |
d2f7cbe7 | 111 | return; |
c9f2a9a6 | 112 | } |
d2f7cbe7 | 113 | |
744937b0 IM |
114 | nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE); |
115 | ||
116 | for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++) | |
117 | set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]); | |
118 | ||
b8f2c21d | 119 | kfree(save_pgd); |
744937b0 | 120 | |
5b83683f | 121 | __flush_tlb_all(); |
9cd2b07c | 122 | early_code_mapping_set_exec(0); |
5b83683f | 123 | } |
e1ad783b | 124 | |
67a9108e MF |
125 | static pgd_t *efi_pgd; |
126 | ||
127 | /* | |
128 | * We need our own copy of the higher levels of the page tables | |
129 | * because we want to avoid inserting EFI region mappings (EFI_VA_END | |
130 | * to EFI_VA_START) into the standard kernel page tables. Everything | |
131 | * else can be shared, see efi_sync_low_kernel_mappings(). | |
132 | */ | |
133 | int __init efi_alloc_page_tables(void) | |
134 | { | |
135 | pgd_t *pgd; | |
136 | pud_t *pud; | |
137 | gfp_t gfp_mask; | |
138 | ||
139 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
140 | return 0; | |
141 | ||
f58f230a | 142 | gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO; |
67a9108e MF |
143 | efi_pgd = (pgd_t *)__get_free_page(gfp_mask); |
144 | if (!efi_pgd) | |
145 | return -ENOMEM; | |
146 | ||
147 | pgd = efi_pgd + pgd_index(EFI_VA_END); | |
148 | ||
149 | pud = pud_alloc_one(NULL, 0); | |
150 | if (!pud) { | |
151 | free_page((unsigned long)efi_pgd); | |
152 | return -ENOMEM; | |
153 | } | |
154 | ||
155 | pgd_populate(NULL, pgd, pud); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
d2f7cbe7 BP |
160 | /* |
161 | * Add low kernel mappings for passing arguments to EFI functions. | |
162 | */ | |
163 | void efi_sync_low_kernel_mappings(void) | |
164 | { | |
67a9108e MF |
165 | unsigned num_entries; |
166 | pgd_t *pgd_k, *pgd_efi; | |
167 | pud_t *pud_k, *pud_efi; | |
d2f7cbe7 BP |
168 | |
169 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
170 | return; | |
171 | ||
67a9108e MF |
172 | /* |
173 | * We can share all PGD entries apart from the one entry that | |
174 | * covers the EFI runtime mapping space. | |
175 | * | |
176 | * Make sure the EFI runtime region mappings are guaranteed to | |
177 | * only span a single PGD entry and that the entry also maps | |
178 | * other important kernel regions. | |
179 | */ | |
180 | BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END)); | |
181 | BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) != | |
182 | (EFI_VA_END & PGDIR_MASK)); | |
183 | ||
184 | pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET); | |
185 | pgd_k = pgd_offset_k(PAGE_OFFSET); | |
186 | ||
187 | num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET); | |
188 | memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries); | |
d2f7cbe7 | 189 | |
67a9108e MF |
190 | /* |
191 | * We share all the PUD entries apart from those that map the | |
192 | * EFI regions. Copy around them. | |
193 | */ | |
194 | BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0); | |
195 | BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0); | |
196 | ||
197 | pgd_efi = efi_pgd + pgd_index(EFI_VA_END); | |
198 | pud_efi = pud_offset(pgd_efi, 0); | |
199 | ||
200 | pgd_k = pgd_offset_k(EFI_VA_END); | |
201 | pud_k = pud_offset(pgd_k, 0); | |
202 | ||
203 | num_entries = pud_index(EFI_VA_END); | |
204 | memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries); | |
205 | ||
206 | pud_efi = pud_offset(pgd_efi, EFI_VA_START); | |
207 | pud_k = pud_offset(pgd_k, EFI_VA_START); | |
208 | ||
209 | num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START); | |
210 | memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries); | |
d2f7cbe7 BP |
211 | } |
212 | ||
4e78eb05 | 213 | int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) |
d2f7cbe7 | 214 | { |
edc3b912 | 215 | unsigned long pfn, text; |
b61a76f8 | 216 | efi_memory_desc_t *md; |
4f9dbcfc | 217 | struct page *page; |
994448f1 | 218 | unsigned npages; |
b7b898ae BP |
219 | pgd_t *pgd; |
220 | ||
221 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
222 | return 0; | |
223 | ||
67a9108e MF |
224 | efi_scratch.efi_pgt = (pgd_t *)__pa(efi_pgd); |
225 | pgd = efi_pgd; | |
d2f7cbe7 | 226 | |
b7b898ae BP |
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 | */ | |
edc3b912 | 233 | pfn = pa_memmap >> PAGE_SHIFT; |
15f003d2 | 234 | if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX | _PAGE_RW)) { |
b7b898ae BP |
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 | ||
4f9dbcfc MF |
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)) | |
994448f1 | 248 | return 0; |
4f9dbcfc | 249 | |
b61a76f8 MF |
250 | /* |
251 | * Map all of RAM so that we can access arguments in the 1:1 | |
252 | * mapping when making EFI runtime calls. | |
253 | */ | |
78ce248f | 254 | for_each_efi_memory_desc(md) { |
b61a76f8 MF |
255 | if (md->type != EFI_CONVENTIONAL_MEMORY && |
256 | md->type != EFI_LOADER_DATA && | |
257 | md->type != EFI_LOADER_CODE) | |
258 | continue; | |
259 | ||
260 | pfn = md->phys_addr >> PAGE_SHIFT; | |
261 | npages = md->num_pages; | |
262 | ||
15f003d2 | 263 | if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, npages, _PAGE_RW)) { |
b61a76f8 MF |
264 | pr_err("Failed to map 1:1 memory\n"); |
265 | return 1; | |
266 | } | |
267 | } | |
268 | ||
4f9dbcfc MF |
269 | page = alloc_page(GFP_KERNEL|__GFP_DMA32); |
270 | if (!page) | |
271 | panic("Unable to allocate EFI runtime stack < 4GB\n"); | |
272 | ||
273 | efi_scratch.phys_stack = virt_to_phys(page_address(page)); | |
274 | efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */ | |
275 | ||
2ad510dc | 276 | npages = (_etext - _text) >> PAGE_SHIFT; |
4f9dbcfc | 277 | text = __pa(_text); |
edc3b912 | 278 | pfn = text >> PAGE_SHIFT; |
4f9dbcfc | 279 | |
15f003d2 | 280 | if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, _PAGE_RW)) { |
4f9dbcfc | 281 | pr_err("Failed to map kernel text 1:1\n"); |
994448f1 | 282 | return 1; |
4f9dbcfc | 283 | } |
b7b898ae BP |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
d2f7cbe7 BP |
288 | static void __init __map_region(efi_memory_desc_t *md, u64 va) |
289 | { | |
15f003d2 | 290 | unsigned long flags = _PAGE_RW; |
edc3b912 | 291 | unsigned long pfn; |
67a9108e | 292 | pgd_t *pgd = efi_pgd; |
d2f7cbe7 BP |
293 | |
294 | if (!(md->attribute & EFI_MEMORY_WB)) | |
edc3b912 | 295 | flags |= _PAGE_PCD; |
d2f7cbe7 | 296 | |
edc3b912 MF |
297 | pfn = md->phys_addr >> PAGE_SHIFT; |
298 | if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags)) | |
d2f7cbe7 BP |
299 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", |
300 | md->phys_addr, va); | |
301 | } | |
302 | ||
303 | void __init efi_map_region(efi_memory_desc_t *md) | |
304 | { | |
305 | unsigned long size = md->num_pages << PAGE_SHIFT; | |
306 | u64 pa = md->phys_addr; | |
307 | ||
308 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
309 | return old_map_region(md); | |
310 | ||
311 | /* | |
312 | * Make sure the 1:1 mappings are present as a catch-all for b0rked | |
313 | * firmware which doesn't update all internal pointers after switching | |
314 | * to virtual mode and would otherwise crap on us. | |
315 | */ | |
316 | __map_region(md, md->phys_addr); | |
317 | ||
4f9dbcfc MF |
318 | /* |
319 | * Enforce the 1:1 mapping as the default virtual address when | |
320 | * booting in EFI mixed mode, because even though we may be | |
321 | * running a 64-bit kernel, the firmware may only be 32-bit. | |
322 | */ | |
323 | if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) { | |
324 | md->virt_addr = md->phys_addr; | |
325 | return; | |
326 | } | |
327 | ||
d2f7cbe7 BP |
328 | efi_va -= size; |
329 | ||
330 | /* Is PA 2M-aligned? */ | |
331 | if (!(pa & (PMD_SIZE - 1))) { | |
332 | efi_va &= PMD_MASK; | |
333 | } else { | |
334 | u64 pa_offset = pa & (PMD_SIZE - 1); | |
335 | u64 prev_va = efi_va; | |
336 | ||
337 | /* get us the same offset within this 2M page */ | |
338 | efi_va = (efi_va & PMD_MASK) + pa_offset; | |
339 | ||
340 | if (efi_va > prev_va) | |
341 | efi_va -= PMD_SIZE; | |
342 | } | |
343 | ||
344 | if (efi_va < EFI_VA_END) { | |
345 | pr_warn(FW_WARN "VA address range overflow!\n"); | |
346 | return; | |
347 | } | |
348 | ||
349 | /* Do the VA map */ | |
350 | __map_region(md, efi_va); | |
351 | md->virt_addr = efi_va; | |
352 | } | |
353 | ||
3b266496 DY |
354 | /* |
355 | * kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges. | |
356 | * md->virt_addr is the original virtual address which had been mapped in kexec | |
357 | * 1st kernel. | |
358 | */ | |
359 | void __init efi_map_region_fixed(efi_memory_desc_t *md) | |
360 | { | |
361 | __map_region(md, md->virt_addr); | |
362 | } | |
363 | ||
e1ad783b | 364 | void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size, |
3e8fa263 | 365 | u32 type, u64 attribute) |
e1ad783b KP |
366 | { |
367 | unsigned long last_map_pfn; | |
368 | ||
369 | if (type == EFI_MEMORY_MAPPED_IO) | |
370 | return ioremap(phys_addr, size); | |
371 | ||
372 | last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size); | |
373 | if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) { | |
374 | unsigned long top = last_map_pfn << PAGE_SHIFT; | |
3e8fa263 | 375 | efi_ioremap(top, size - (top - phys_addr), type, attribute); |
e1ad783b KP |
376 | } |
377 | ||
3e8fa263 MF |
378 | if (!(attribute & EFI_MEMORY_WB)) |
379 | efi_memory_uc((u64)(unsigned long)__va(phys_addr), size); | |
380 | ||
e1ad783b KP |
381 | return (void __iomem *)__va(phys_addr); |
382 | } | |
1fec0533 DY |
383 | |
384 | void __init parse_efi_setup(u64 phys_addr, u32 data_len) | |
385 | { | |
386 | efi_setup = phys_addr + sizeof(struct setup_data); | |
1fec0533 | 387 | } |
c55d016f | 388 | |
6d0cc887 | 389 | void __init efi_runtime_update_mappings(void) |
c55d016f | 390 | { |
6d0cc887 SP |
391 | unsigned long pfn; |
392 | pgd_t *pgd = efi_pgd; | |
393 | efi_memory_desc_t *md; | |
6d0cc887 SP |
394 | |
395 | if (efi_enabled(EFI_OLD_MEMMAP)) { | |
396 | if (__supported_pte_mask & _PAGE_NX) | |
397 | runtime_code_page_mkexec(); | |
398 | return; | |
399 | } | |
400 | ||
401 | if (!efi_enabled(EFI_NX_PE_DATA)) | |
c55d016f BP |
402 | return; |
403 | ||
78ce248f | 404 | for_each_efi_memory_desc(md) { |
6d0cc887 | 405 | unsigned long pf = 0; |
6d0cc887 SP |
406 | |
407 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) | |
408 | continue; | |
409 | ||
410 | if (!(md->attribute & EFI_MEMORY_WB)) | |
411 | pf |= _PAGE_PCD; | |
412 | ||
413 | if ((md->attribute & EFI_MEMORY_XP) || | |
414 | (md->type == EFI_RUNTIME_SERVICES_DATA)) | |
415 | pf |= _PAGE_NX; | |
416 | ||
417 | if (!(md->attribute & EFI_MEMORY_RO) && | |
418 | (md->type != EFI_RUNTIME_SERVICES_CODE)) | |
419 | pf |= _PAGE_RW; | |
420 | ||
421 | /* Update the 1:1 mapping */ | |
422 | pfn = md->phys_addr >> PAGE_SHIFT; | |
423 | if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf)) | |
424 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", | |
425 | md->phys_addr, md->virt_addr); | |
426 | ||
427 | if (kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf)) | |
428 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", | |
429 | md->phys_addr, md->virt_addr); | |
430 | } | |
c55d016f | 431 | } |
11cc8512 BP |
432 | |
433 | void __init efi_dump_pagetable(void) | |
434 | { | |
435 | #ifdef CONFIG_EFI_PGT_DUMP | |
67a9108e | 436 | ptdump_walk_pgd_level(NULL, efi_pgd); |
11cc8512 BP |
437 | #endif |
438 | } | |
994448f1 | 439 | |
4f9dbcfc MF |
440 | #ifdef CONFIG_EFI_MIXED |
441 | extern efi_status_t efi64_thunk(u32, ...); | |
442 | ||
443 | #define runtime_service32(func) \ | |
444 | ({ \ | |
445 | u32 table = (u32)(unsigned long)efi.systab; \ | |
446 | u32 *rt, *___f; \ | |
447 | \ | |
448 | rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime)); \ | |
449 | ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \ | |
450 | *___f; \ | |
451 | }) | |
452 | ||
453 | /* | |
454 | * Switch to the EFI page tables early so that we can access the 1:1 | |
455 | * runtime services mappings which are not mapped in any other page | |
456 | * tables. This function must be called before runtime_service32(). | |
457 | * | |
458 | * Also, disable interrupts because the IDT points to 64-bit handlers, | |
459 | * which aren't going to function correctly when we switch to 32-bit. | |
460 | */ | |
461 | #define efi_thunk(f, ...) \ | |
462 | ({ \ | |
463 | efi_status_t __s; \ | |
21f86625 AT |
464 | unsigned long __flags; \ |
465 | u32 __func; \ | |
4f9dbcfc | 466 | \ |
21f86625 AT |
467 | local_irq_save(__flags); \ |
468 | arch_efi_call_virt_setup(); \ | |
4f9dbcfc | 469 | \ |
21f86625 AT |
470 | __func = runtime_service32(f); \ |
471 | __s = efi64_thunk(__func, __VA_ARGS__); \ | |
4f9dbcfc | 472 | \ |
21f86625 AT |
473 | arch_efi_call_virt_teardown(); \ |
474 | local_irq_restore(__flags); \ | |
4f9dbcfc MF |
475 | \ |
476 | __s; \ | |
477 | }) | |
478 | ||
479 | efi_status_t efi_thunk_set_virtual_address_map( | |
480 | void *phys_set_virtual_address_map, | |
481 | unsigned long memory_map_size, | |
482 | unsigned long descriptor_size, | |
483 | u32 descriptor_version, | |
484 | efi_memory_desc_t *virtual_map) | |
485 | { | |
486 | efi_status_t status; | |
487 | unsigned long flags; | |
488 | u32 func; | |
489 | ||
490 | efi_sync_low_kernel_mappings(); | |
491 | local_irq_save(flags); | |
492 | ||
493 | efi_scratch.prev_cr3 = read_cr3(); | |
494 | write_cr3((unsigned long)efi_scratch.efi_pgt); | |
495 | __flush_tlb_all(); | |
496 | ||
497 | func = (u32)(unsigned long)phys_set_virtual_address_map; | |
498 | status = efi64_thunk(func, memory_map_size, descriptor_size, | |
499 | descriptor_version, virtual_map); | |
500 | ||
501 | write_cr3(efi_scratch.prev_cr3); | |
502 | __flush_tlb_all(); | |
503 | local_irq_restore(flags); | |
504 | ||
505 | return status; | |
506 | } | |
507 | ||
508 | static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc) | |
509 | { | |
510 | efi_status_t status; | |
511 | u32 phys_tm, phys_tc; | |
512 | ||
513 | spin_lock(&rtc_lock); | |
514 | ||
515 | phys_tm = virt_to_phys(tm); | |
516 | phys_tc = virt_to_phys(tc); | |
517 | ||
518 | status = efi_thunk(get_time, phys_tm, phys_tc); | |
519 | ||
520 | spin_unlock(&rtc_lock); | |
521 | ||
522 | return status; | |
523 | } | |
524 | ||
525 | static efi_status_t efi_thunk_set_time(efi_time_t *tm) | |
526 | { | |
527 | efi_status_t status; | |
528 | u32 phys_tm; | |
529 | ||
530 | spin_lock(&rtc_lock); | |
531 | ||
532 | phys_tm = virt_to_phys(tm); | |
533 | ||
534 | status = efi_thunk(set_time, phys_tm); | |
535 | ||
536 | spin_unlock(&rtc_lock); | |
537 | ||
538 | return status; | |
539 | } | |
540 | ||
541 | static efi_status_t | |
542 | efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending, | |
543 | efi_time_t *tm) | |
544 | { | |
545 | efi_status_t status; | |
546 | u32 phys_enabled, phys_pending, phys_tm; | |
547 | ||
548 | spin_lock(&rtc_lock); | |
549 | ||
550 | phys_enabled = virt_to_phys(enabled); | |
551 | phys_pending = virt_to_phys(pending); | |
552 | phys_tm = virt_to_phys(tm); | |
553 | ||
554 | status = efi_thunk(get_wakeup_time, phys_enabled, | |
555 | phys_pending, phys_tm); | |
556 | ||
557 | spin_unlock(&rtc_lock); | |
558 | ||
559 | return status; | |
560 | } | |
561 | ||
562 | static efi_status_t | |
563 | efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
564 | { | |
565 | efi_status_t status; | |
566 | u32 phys_tm; | |
567 | ||
568 | spin_lock(&rtc_lock); | |
569 | ||
570 | phys_tm = virt_to_phys(tm); | |
571 | ||
572 | status = efi_thunk(set_wakeup_time, enabled, phys_tm); | |
573 | ||
574 | spin_unlock(&rtc_lock); | |
575 | ||
576 | return status; | |
577 | } | |
578 | ||
579 | ||
580 | static efi_status_t | |
581 | efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor, | |
582 | u32 *attr, unsigned long *data_size, void *data) | |
583 | { | |
584 | efi_status_t status; | |
585 | u32 phys_name, phys_vendor, phys_attr; | |
586 | u32 phys_data_size, phys_data; | |
587 | ||
588 | phys_data_size = virt_to_phys(data_size); | |
589 | phys_vendor = virt_to_phys(vendor); | |
590 | phys_name = virt_to_phys(name); | |
591 | phys_attr = virt_to_phys(attr); | |
592 | phys_data = virt_to_phys(data); | |
593 | ||
594 | status = efi_thunk(get_variable, phys_name, phys_vendor, | |
595 | phys_attr, phys_data_size, phys_data); | |
596 | ||
597 | return status; | |
598 | } | |
599 | ||
600 | static efi_status_t | |
601 | efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor, | |
602 | u32 attr, unsigned long data_size, void *data) | |
603 | { | |
604 | u32 phys_name, phys_vendor, phys_data; | |
605 | efi_status_t status; | |
606 | ||
607 | phys_name = virt_to_phys(name); | |
608 | phys_vendor = virt_to_phys(vendor); | |
609 | phys_data = virt_to_phys(data); | |
610 | ||
611 | /* If data_size is > sizeof(u32) we've got problems */ | |
612 | status = efi_thunk(set_variable, phys_name, phys_vendor, | |
613 | attr, data_size, phys_data); | |
614 | ||
615 | return status; | |
616 | } | |
617 | ||
618 | static efi_status_t | |
619 | efi_thunk_get_next_variable(unsigned long *name_size, | |
620 | efi_char16_t *name, | |
621 | efi_guid_t *vendor) | |
622 | { | |
623 | efi_status_t status; | |
624 | u32 phys_name_size, phys_name, phys_vendor; | |
625 | ||
626 | phys_name_size = virt_to_phys(name_size); | |
627 | phys_vendor = virt_to_phys(vendor); | |
628 | phys_name = virt_to_phys(name); | |
629 | ||
630 | status = efi_thunk(get_next_variable, phys_name_size, | |
631 | phys_name, phys_vendor); | |
632 | ||
633 | return status; | |
634 | } | |
635 | ||
636 | static efi_status_t | |
637 | efi_thunk_get_next_high_mono_count(u32 *count) | |
638 | { | |
639 | efi_status_t status; | |
640 | u32 phys_count; | |
641 | ||
642 | phys_count = virt_to_phys(count); | |
643 | status = efi_thunk(get_next_high_mono_count, phys_count); | |
644 | ||
645 | return status; | |
646 | } | |
647 | ||
648 | static void | |
649 | efi_thunk_reset_system(int reset_type, efi_status_t status, | |
650 | unsigned long data_size, efi_char16_t *data) | |
651 | { | |
652 | u32 phys_data; | |
653 | ||
654 | phys_data = virt_to_phys(data); | |
655 | ||
656 | efi_thunk(reset_system, reset_type, status, data_size, phys_data); | |
657 | } | |
658 | ||
659 | static efi_status_t | |
660 | efi_thunk_update_capsule(efi_capsule_header_t **capsules, | |
661 | unsigned long count, unsigned long sg_list) | |
662 | { | |
663 | /* | |
664 | * To properly support this function we would need to repackage | |
665 | * 'capsules' because the firmware doesn't understand 64-bit | |
666 | * pointers. | |
667 | */ | |
668 | return EFI_UNSUPPORTED; | |
669 | } | |
670 | ||
671 | static efi_status_t | |
672 | efi_thunk_query_variable_info(u32 attr, u64 *storage_space, | |
673 | u64 *remaining_space, | |
674 | u64 *max_variable_size) | |
675 | { | |
676 | efi_status_t status; | |
677 | u32 phys_storage, phys_remaining, phys_max; | |
678 | ||
679 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
680 | return EFI_UNSUPPORTED; | |
681 | ||
682 | phys_storage = virt_to_phys(storage_space); | |
683 | phys_remaining = virt_to_phys(remaining_space); | |
684 | phys_max = virt_to_phys(max_variable_size); | |
685 | ||
9a11040f | 686 | status = efi_thunk(query_variable_info, attr, phys_storage, |
4f9dbcfc MF |
687 | phys_remaining, phys_max); |
688 | ||
689 | return status; | |
690 | } | |
691 | ||
692 | static efi_status_t | |
693 | efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules, | |
694 | unsigned long count, u64 *max_size, | |
695 | int *reset_type) | |
696 | { | |
697 | /* | |
698 | * To properly support this function we would need to repackage | |
699 | * 'capsules' because the firmware doesn't understand 64-bit | |
700 | * pointers. | |
701 | */ | |
702 | return EFI_UNSUPPORTED; | |
703 | } | |
704 | ||
705 | void efi_thunk_runtime_setup(void) | |
706 | { | |
707 | efi.get_time = efi_thunk_get_time; | |
708 | efi.set_time = efi_thunk_set_time; | |
709 | efi.get_wakeup_time = efi_thunk_get_wakeup_time; | |
710 | efi.set_wakeup_time = efi_thunk_set_wakeup_time; | |
711 | efi.get_variable = efi_thunk_get_variable; | |
712 | efi.get_next_variable = efi_thunk_get_next_variable; | |
713 | efi.set_variable = efi_thunk_set_variable; | |
714 | efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count; | |
715 | efi.reset_system = efi_thunk_reset_system; | |
716 | efi.query_variable_info = efi_thunk_query_variable_info; | |
717 | efi.update_capsule = efi_thunk_update_capsule; | |
718 | efi.query_capsule_caps = efi_thunk_query_capsule_caps; | |
719 | } | |
720 | #endif /* CONFIG_EFI_MIXED */ |