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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5b83683f HY |
2 | /* |
3 | * x86_64 specific EFI support functions | |
4 | * Based on Extensible Firmware Interface Specification version 1.0 | |
5 | * | |
6 | * Copyright (C) 2005-2008 Intel Co. | |
7 | * Fenghua Yu <fenghua.yu@intel.com> | |
8 | * Bibo Mao <bibo.mao@intel.com> | |
9 | * Chandramouli Narayanan <mouli@linux.intel.com> | |
10 | * Huang Ying <ying.huang@intel.com> | |
11 | * | |
12 | * Code to convert EFI to E820 map has been implemented in elilo bootloader | |
13 | * based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table | |
14 | * is setup appropriately for EFI runtime code. | |
15 | * - mouli 06/14/2007. | |
16 | * | |
17 | */ | |
18 | ||
26d7f65f MF |
19 | #define pr_fmt(fmt) "efi: " fmt |
20 | ||
5b83683f HY |
21 | #include <linux/kernel.h> |
22 | #include <linux/init.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/spinlock.h> | |
26 | #include <linux/bootmem.h> | |
27 | #include <linux/ioport.h> | |
cc3ae7b0 | 28 | #include <linux/init.h> |
5ab788d7 | 29 | #include <linux/mc146818rtc.h> |
5b83683f HY |
30 | #include <linux/efi.h> |
31 | #include <linux/uaccess.h> | |
32 | #include <linux/io.h> | |
33 | #include <linux/reboot.h> | |
0d01ff25 | 34 | #include <linux/slab.h> |
f6697df3 | 35 | #include <linux/ucs2_string.h> |
1379edd5 | 36 | #include <linux/mem_encrypt.h> |
5b83683f HY |
37 | |
38 | #include <asm/setup.h> | |
39 | #include <asm/page.h> | |
66441bd3 | 40 | #include <asm/e820/api.h> |
5b83683f HY |
41 | #include <asm/pgtable.h> |
42 | #include <asm/tlbflush.h> | |
5b83683f HY |
43 | #include <asm/proto.h> |
44 | #include <asm/efi.h> | |
4de0d4a6 | 45 | #include <asm/cacheflush.h> |
3819cd48 | 46 | #include <asm/fixmap.h> |
d2f7cbe7 | 47 | #include <asm/realmode.h> |
4f9dbcfc | 48 | #include <asm/time.h> |
67a9108e | 49 | #include <asm/pgalloc.h> |
5b83683f | 50 | |
d2f7cbe7 | 51 | /* |
b1d17761 | 52 | * We allocate runtime services regions top-down, starting from -4G, i.e. |
d2f7cbe7 BP |
53 | * 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G. |
54 | */ | |
8266e31e | 55 | static u64 efi_va = EFI_VA_START; |
d2f7cbe7 | 56 | |
c9f2a9a6 | 57 | struct efi_scratch efi_scratch; |
d2f7cbe7 | 58 | |
9cd2b07c | 59 | static void __init early_code_mapping_set_exec(int executable) |
5b83683f HY |
60 | { |
61 | efi_memory_desc_t *md; | |
5b83683f | 62 | |
a2172e25 HY |
63 | if (!(__supported_pte_mask & _PAGE_NX)) |
64 | return; | |
65 | ||
916f676f | 66 | /* Make EFI service code area executable */ |
78ce248f | 67 | for_each_efi_memory_desc(md) { |
916f676f MG |
68 | if (md->type == EFI_RUNTIME_SERVICES_CODE || |
69 | md->type == EFI_BOOT_SERVICES_CODE) | |
9cd2b07c | 70 | efi_set_executable(md, executable); |
5b83683f HY |
71 | } |
72 | } | |
73 | ||
744937b0 | 74 | pgd_t * __init efi_call_phys_prolog(void) |
5b83683f | 75 | { |
94133e46 BH |
76 | unsigned long vaddr, addr_pgd, addr_p4d, addr_pud; |
77 | pgd_t *save_pgd, *pgd_k, *pgd_efi; | |
78 | p4d_t *p4d, *p4d_k, *p4d_efi; | |
79 | pud_t *pud; | |
744937b0 | 80 | |
b8f2c21d | 81 | int pgd; |
94133e46 | 82 | int n_pgds, i, j; |
5b83683f | 83 | |
c9f2a9a6 | 84 | if (!efi_enabled(EFI_OLD_MEMMAP)) { |
6c690ee1 | 85 | save_pgd = (pgd_t *)__read_cr3(); |
c9f2a9a6 MF |
86 | write_cr3((unsigned long)efi_scratch.efi_pgt); |
87 | goto out; | |
88 | } | |
d2f7cbe7 | 89 | |
9cd2b07c | 90 | early_code_mapping_set_exec(1); |
b8f2c21d NZ |
91 | |
92 | n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE); | |
20ebc15e | 93 | save_pgd = kmalloc_array(n_pgds, sizeof(*save_pgd), GFP_KERNEL); |
b8f2c21d | 94 | |
94133e46 BH |
95 | /* |
96 | * Build 1:1 identity mapping for efi=old_map usage. Note that | |
97 | * PAGE_OFFSET is PGDIR_SIZE aligned when KASLR is disabled, while | |
98 | * it is PUD_SIZE ALIGNED with KASLR enabled. So for a given physical | |
99 | * address X, the pud_index(X) != pud_index(__va(X)), we can only copy | |
100 | * PUD entry of __va(X) to fill in pud entry of X to build 1:1 mapping. | |
101 | * This means here we can only reuse the PMD tables of the direct mapping. | |
102 | */ | |
b8f2c21d | 103 | for (pgd = 0; pgd < n_pgds; pgd++) { |
94133e46 BH |
104 | addr_pgd = (unsigned long)(pgd * PGDIR_SIZE); |
105 | vaddr = (unsigned long)__va(pgd * PGDIR_SIZE); | |
106 | pgd_efi = pgd_offset_k(addr_pgd); | |
107 | save_pgd[pgd] = *pgd_efi; | |
108 | ||
109 | p4d = p4d_alloc(&init_mm, pgd_efi, addr_pgd); | |
110 | if (!p4d) { | |
111 | pr_err("Failed to allocate p4d table!\n"); | |
112 | goto out; | |
113 | } | |
114 | ||
115 | for (i = 0; i < PTRS_PER_P4D; i++) { | |
116 | addr_p4d = addr_pgd + i * P4D_SIZE; | |
117 | p4d_efi = p4d + p4d_index(addr_p4d); | |
118 | ||
119 | pud = pud_alloc(&init_mm, p4d_efi, addr_p4d); | |
120 | if (!pud) { | |
121 | pr_err("Failed to allocate pud table!\n"); | |
122 | goto out; | |
123 | } | |
124 | ||
125 | for (j = 0; j < PTRS_PER_PUD; j++) { | |
126 | addr_pud = addr_p4d + j * PUD_SIZE; | |
127 | ||
128 | if (addr_pud > (max_pfn << PAGE_SHIFT)) | |
129 | break; | |
130 | ||
131 | vaddr = (unsigned long)__va(addr_pud); | |
132 | ||
133 | pgd_k = pgd_offset_k(vaddr); | |
134 | p4d_k = p4d_offset(pgd_k, vaddr); | |
135 | pud[j] = *pud_offset(p4d_k, vaddr); | |
136 | } | |
137 | } | |
de53c378 | 138 | pgd_offset_k(pgd * PGDIR_SIZE)->pgd &= ~_PAGE_NX; |
b8f2c21d | 139 | } |
de53c378 | 140 | |
c9f2a9a6 | 141 | out: |
5b83683f | 142 | __flush_tlb_all(); |
744937b0 IM |
143 | |
144 | return save_pgd; | |
5b83683f HY |
145 | } |
146 | ||
744937b0 | 147 | void __init efi_call_phys_epilog(pgd_t *save_pgd) |
5b83683f HY |
148 | { |
149 | /* | |
150 | * After the lock is released, the original page table is restored. | |
151 | */ | |
94133e46 | 152 | int pgd_idx, i; |
744937b0 | 153 | int nr_pgds; |
94133e46 BH |
154 | pgd_t *pgd; |
155 | p4d_t *p4d; | |
156 | pud_t *pud; | |
d2f7cbe7 | 157 | |
c9f2a9a6 MF |
158 | if (!efi_enabled(EFI_OLD_MEMMAP)) { |
159 | write_cr3((unsigned long)save_pgd); | |
160 | __flush_tlb_all(); | |
d2f7cbe7 | 161 | return; |
c9f2a9a6 | 162 | } |
d2f7cbe7 | 163 | |
744937b0 IM |
164 | nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE); |
165 | ||
94133e46 BH |
166 | for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++) { |
167 | pgd = pgd_offset_k(pgd_idx * PGDIR_SIZE); | |
744937b0 IM |
168 | set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]); |
169 | ||
94133e46 BH |
170 | if (!(pgd_val(*pgd) & _PAGE_PRESENT)) |
171 | continue; | |
172 | ||
173 | for (i = 0; i < PTRS_PER_P4D; i++) { | |
174 | p4d = p4d_offset(pgd, | |
175 | pgd_idx * PGDIR_SIZE + i * P4D_SIZE); | |
176 | ||
177 | if (!(p4d_val(*p4d) & _PAGE_PRESENT)) | |
178 | continue; | |
179 | ||
180 | pud = (pud_t *)p4d_page_vaddr(*p4d); | |
181 | pud_free(&init_mm, pud); | |
182 | } | |
183 | ||
184 | p4d = (p4d_t *)pgd_page_vaddr(*pgd); | |
185 | p4d_free(&init_mm, p4d); | |
186 | } | |
187 | ||
b8f2c21d | 188 | kfree(save_pgd); |
744937b0 | 189 | |
5b83683f | 190 | __flush_tlb_all(); |
9cd2b07c | 191 | early_code_mapping_set_exec(0); |
5b83683f | 192 | } |
e1ad783b | 193 | |
67a9108e MF |
194 | static pgd_t *efi_pgd; |
195 | ||
196 | /* | |
197 | * We need our own copy of the higher levels of the page tables | |
198 | * because we want to avoid inserting EFI region mappings (EFI_VA_END | |
199 | * to EFI_VA_START) into the standard kernel page tables. Everything | |
200 | * else can be shared, see efi_sync_low_kernel_mappings(). | |
d9e9a641 DH |
201 | * |
202 | * We don't want the pgd on the pgd_list and cannot use pgd_alloc() for the | |
203 | * allocation. | |
67a9108e MF |
204 | */ |
205 | int __init efi_alloc_page_tables(void) | |
206 | { | |
207 | pgd_t *pgd; | |
e981316f | 208 | p4d_t *p4d; |
67a9108e MF |
209 | pud_t *pud; |
210 | gfp_t gfp_mask; | |
211 | ||
212 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
213 | return 0; | |
214 | ||
75f296d9 | 215 | gfp_mask = GFP_KERNEL | __GFP_ZERO; |
d9e9a641 | 216 | efi_pgd = (pgd_t *)__get_free_pages(gfp_mask, PGD_ALLOCATION_ORDER); |
67a9108e MF |
217 | if (!efi_pgd) |
218 | return -ENOMEM; | |
219 | ||
220 | pgd = efi_pgd + pgd_index(EFI_VA_END); | |
e981316f KS |
221 | p4d = p4d_alloc(&init_mm, pgd, EFI_VA_END); |
222 | if (!p4d) { | |
223 | free_page((unsigned long)efi_pgd); | |
224 | return -ENOMEM; | |
225 | } | |
67a9108e | 226 | |
e981316f | 227 | pud = pud_alloc(&init_mm, p4d, EFI_VA_END); |
67a9108e | 228 | if (!pud) { |
e981316f KS |
229 | if (CONFIG_PGTABLE_LEVELS > 4) |
230 | free_page((unsigned long) pgd_page_vaddr(*pgd)); | |
67a9108e MF |
231 | free_page((unsigned long)efi_pgd); |
232 | return -ENOMEM; | |
233 | } | |
234 | ||
67a9108e MF |
235 | return 0; |
236 | } | |
237 | ||
d2f7cbe7 BP |
238 | /* |
239 | * Add low kernel mappings for passing arguments to EFI functions. | |
240 | */ | |
241 | void efi_sync_low_kernel_mappings(void) | |
242 | { | |
67a9108e MF |
243 | unsigned num_entries; |
244 | pgd_t *pgd_k, *pgd_efi; | |
e0c4f675 | 245 | p4d_t *p4d_k, *p4d_efi; |
67a9108e | 246 | pud_t *pud_k, *pud_efi; |
d2f7cbe7 BP |
247 | |
248 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
249 | return; | |
250 | ||
67a9108e MF |
251 | /* |
252 | * We can share all PGD entries apart from the one entry that | |
253 | * covers the EFI runtime mapping space. | |
254 | * | |
255 | * Make sure the EFI runtime region mappings are guaranteed to | |
256 | * only span a single PGD entry and that the entry also maps | |
257 | * other important kernel regions. | |
258 | */ | |
259 | BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END)); | |
260 | BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) != | |
261 | (EFI_VA_END & PGDIR_MASK)); | |
262 | ||
263 | pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET); | |
264 | pgd_k = pgd_offset_k(PAGE_OFFSET); | |
265 | ||
266 | num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET); | |
267 | memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries); | |
d2f7cbe7 | 268 | |
e981316f KS |
269 | /* |
270 | * As with PGDs, we share all P4D entries apart from the one entry | |
271 | * that covers the EFI runtime mapping space. | |
272 | */ | |
273 | BUILD_BUG_ON(p4d_index(EFI_VA_END) != p4d_index(MODULES_END)); | |
274 | BUILD_BUG_ON((EFI_VA_START & P4D_MASK) != (EFI_VA_END & P4D_MASK)); | |
275 | ||
276 | pgd_efi = efi_pgd + pgd_index(EFI_VA_END); | |
277 | pgd_k = pgd_offset_k(EFI_VA_END); | |
278 | p4d_efi = p4d_offset(pgd_efi, 0); | |
279 | p4d_k = p4d_offset(pgd_k, 0); | |
280 | ||
281 | num_entries = p4d_index(EFI_VA_END); | |
282 | memcpy(p4d_efi, p4d_k, sizeof(p4d_t) * num_entries); | |
283 | ||
67a9108e MF |
284 | /* |
285 | * We share all the PUD entries apart from those that map the | |
286 | * EFI regions. Copy around them. | |
287 | */ | |
288 | BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0); | |
289 | BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0); | |
290 | ||
e981316f KS |
291 | p4d_efi = p4d_offset(pgd_efi, EFI_VA_END); |
292 | p4d_k = p4d_offset(pgd_k, EFI_VA_END); | |
e0c4f675 | 293 | pud_efi = pud_offset(p4d_efi, 0); |
e0c4f675 | 294 | pud_k = pud_offset(p4d_k, 0); |
67a9108e MF |
295 | |
296 | num_entries = pud_index(EFI_VA_END); | |
297 | memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries); | |
298 | ||
e0c4f675 | 299 | pud_efi = pud_offset(p4d_efi, EFI_VA_START); |
e0c4f675 | 300 | pud_k = pud_offset(p4d_k, EFI_VA_START); |
67a9108e MF |
301 | |
302 | num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START); | |
303 | memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries); | |
d2f7cbe7 BP |
304 | } |
305 | ||
f6697df3 MF |
306 | /* |
307 | * Wrapper for slow_virt_to_phys() that handles NULL addresses. | |
308 | */ | |
309 | static inline phys_addr_t | |
310 | virt_to_phys_or_null_size(void *va, unsigned long size) | |
311 | { | |
312 | bool bad_size; | |
313 | ||
314 | if (!va) | |
315 | return 0; | |
316 | ||
317 | if (virt_addr_valid(va)) | |
318 | return virt_to_phys(va); | |
319 | ||
320 | /* | |
321 | * A fully aligned variable on the stack is guaranteed not to | |
322 | * cross a page bounary. Try to catch strings on the stack by | |
323 | * checking that 'size' is a power of two. | |
324 | */ | |
325 | bad_size = size > PAGE_SIZE || !is_power_of_2(size); | |
326 | ||
327 | WARN_ON(!IS_ALIGNED((unsigned long)va, size) || bad_size); | |
328 | ||
329 | return slow_virt_to_phys(va); | |
330 | } | |
331 | ||
332 | #define virt_to_phys_or_null(addr) \ | |
333 | virt_to_phys_or_null_size((addr), sizeof(*(addr))) | |
334 | ||
4e78eb05 | 335 | int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) |
d2f7cbe7 | 336 | { |
38eecccd | 337 | unsigned long pfn, text, pf; |
4f9dbcfc | 338 | struct page *page; |
994448f1 | 339 | unsigned npages; |
b7b898ae BP |
340 | pgd_t *pgd; |
341 | ||
342 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
343 | return 0; | |
344 | ||
38eecccd TL |
345 | /* |
346 | * Since the PGD is encrypted, set the encryption mask so that when | |
347 | * this value is loaded into cr3 the PGD will be decrypted during | |
348 | * the pagetable walk. | |
349 | */ | |
350 | efi_scratch.efi_pgt = (pgd_t *)__sme_pa(efi_pgd); | |
67a9108e | 351 | pgd = efi_pgd; |
d2f7cbe7 | 352 | |
b7b898ae BP |
353 | /* |
354 | * It can happen that the physical address of new_memmap lands in memory | |
355 | * which is not mapped in the EFI page table. Therefore we need to go | |
356 | * and ident-map those pages containing the map before calling | |
357 | * phys_efi_set_virtual_address_map(). | |
358 | */ | |
edc3b912 | 359 | pfn = pa_memmap >> PAGE_SHIFT; |
38eecccd TL |
360 | pf = _PAGE_NX | _PAGE_RW | _PAGE_ENC; |
361 | if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, pf)) { | |
b7b898ae BP |
362 | pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap); |
363 | return 1; | |
364 | } | |
365 | ||
366 | efi_scratch.use_pgd = true; | |
367 | ||
bf29bddf JK |
368 | /* |
369 | * Certain firmware versions are way too sentimential and still believe | |
370 | * they are exclusive and unquestionable owners of the first physical page, | |
371 | * even though they explicitly mark it as EFI_CONVENTIONAL_MEMORY | |
372 | * (but then write-access it later during SetVirtualAddressMap()). | |
373 | * | |
374 | * Create a 1:1 mapping for this page, to avoid triple faults during early | |
375 | * boot with such firmware. We are free to hand this page to the BIOS, | |
376 | * as trim_bios_range() will reserve the first page and isolate it away | |
377 | * from memory allocators anyway. | |
378 | */ | |
1379edd5 TL |
379 | pf = _PAGE_RW; |
380 | if (sev_active()) | |
381 | pf |= _PAGE_ENC; | |
382 | ||
383 | if (kernel_map_pages_in_pgd(pgd, 0x0, 0x0, 1, pf)) { | |
bf29bddf JK |
384 | pr_err("Failed to create 1:1 mapping for the first page!\n"); |
385 | return 1; | |
386 | } | |
387 | ||
4f9dbcfc MF |
388 | /* |
389 | * When making calls to the firmware everything needs to be 1:1 | |
390 | * mapped and addressable with 32-bit pointers. Map the kernel | |
391 | * text and allocate a new stack because we can't rely on the | |
392 | * stack pointer being < 4GB. | |
393 | */ | |
12976670 | 394 | if (!IS_ENABLED(CONFIG_EFI_MIXED) || efi_is_native()) |
994448f1 | 395 | return 0; |
4f9dbcfc MF |
396 | |
397 | page = alloc_page(GFP_KERNEL|__GFP_DMA32); | |
398 | if (!page) | |
399 | panic("Unable to allocate EFI runtime stack < 4GB\n"); | |
400 | ||
401 | efi_scratch.phys_stack = virt_to_phys(page_address(page)); | |
402 | efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */ | |
403 | ||
2ad510dc | 404 | npages = (_etext - _text) >> PAGE_SHIFT; |
4f9dbcfc | 405 | text = __pa(_text); |
edc3b912 | 406 | pfn = text >> PAGE_SHIFT; |
4f9dbcfc | 407 | |
38eecccd TL |
408 | pf = _PAGE_RW | _PAGE_ENC; |
409 | if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, pf)) { | |
4f9dbcfc | 410 | pr_err("Failed to map kernel text 1:1\n"); |
994448f1 | 411 | return 1; |
4f9dbcfc | 412 | } |
b7b898ae BP |
413 | |
414 | return 0; | |
415 | } | |
416 | ||
d2f7cbe7 BP |
417 | static void __init __map_region(efi_memory_desc_t *md, u64 va) |
418 | { | |
15f003d2 | 419 | unsigned long flags = _PAGE_RW; |
edc3b912 | 420 | unsigned long pfn; |
67a9108e | 421 | pgd_t *pgd = efi_pgd; |
d2f7cbe7 BP |
422 | |
423 | if (!(md->attribute & EFI_MEMORY_WB)) | |
edc3b912 | 424 | flags |= _PAGE_PCD; |
d2f7cbe7 | 425 | |
1379edd5 TL |
426 | if (sev_active()) |
427 | flags |= _PAGE_ENC; | |
428 | ||
edc3b912 MF |
429 | pfn = md->phys_addr >> PAGE_SHIFT; |
430 | if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags)) | |
d2f7cbe7 BP |
431 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", |
432 | md->phys_addr, va); | |
433 | } | |
434 | ||
435 | void __init efi_map_region(efi_memory_desc_t *md) | |
436 | { | |
437 | unsigned long size = md->num_pages << PAGE_SHIFT; | |
438 | u64 pa = md->phys_addr; | |
439 | ||
440 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
441 | return old_map_region(md); | |
442 | ||
443 | /* | |
444 | * Make sure the 1:1 mappings are present as a catch-all for b0rked | |
445 | * firmware which doesn't update all internal pointers after switching | |
446 | * to virtual mode and would otherwise crap on us. | |
447 | */ | |
448 | __map_region(md, md->phys_addr); | |
449 | ||
4f9dbcfc MF |
450 | /* |
451 | * Enforce the 1:1 mapping as the default virtual address when | |
452 | * booting in EFI mixed mode, because even though we may be | |
453 | * running a 64-bit kernel, the firmware may only be 32-bit. | |
454 | */ | |
455 | if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) { | |
456 | md->virt_addr = md->phys_addr; | |
457 | return; | |
458 | } | |
459 | ||
d2f7cbe7 BP |
460 | efi_va -= size; |
461 | ||
462 | /* Is PA 2M-aligned? */ | |
463 | if (!(pa & (PMD_SIZE - 1))) { | |
464 | efi_va &= PMD_MASK; | |
465 | } else { | |
466 | u64 pa_offset = pa & (PMD_SIZE - 1); | |
467 | u64 prev_va = efi_va; | |
468 | ||
469 | /* get us the same offset within this 2M page */ | |
470 | efi_va = (efi_va & PMD_MASK) + pa_offset; | |
471 | ||
472 | if (efi_va > prev_va) | |
473 | efi_va -= PMD_SIZE; | |
474 | } | |
475 | ||
476 | if (efi_va < EFI_VA_END) { | |
477 | pr_warn(FW_WARN "VA address range overflow!\n"); | |
478 | return; | |
479 | } | |
480 | ||
481 | /* Do the VA map */ | |
482 | __map_region(md, efi_va); | |
483 | md->virt_addr = efi_va; | |
484 | } | |
485 | ||
3b266496 DY |
486 | /* |
487 | * kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges. | |
488 | * md->virt_addr is the original virtual address which had been mapped in kexec | |
489 | * 1st kernel. | |
490 | */ | |
491 | void __init efi_map_region_fixed(efi_memory_desc_t *md) | |
492 | { | |
0513fe1d | 493 | __map_region(md, md->phys_addr); |
3b266496 DY |
494 | __map_region(md, md->virt_addr); |
495 | } | |
496 | ||
e1ad783b | 497 | void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size, |
3e8fa263 | 498 | u32 type, u64 attribute) |
e1ad783b KP |
499 | { |
500 | unsigned long last_map_pfn; | |
501 | ||
502 | if (type == EFI_MEMORY_MAPPED_IO) | |
503 | return ioremap(phys_addr, size); | |
504 | ||
505 | last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size); | |
506 | if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) { | |
507 | unsigned long top = last_map_pfn << PAGE_SHIFT; | |
3e8fa263 | 508 | efi_ioremap(top, size - (top - phys_addr), type, attribute); |
e1ad783b KP |
509 | } |
510 | ||
3e8fa263 MF |
511 | if (!(attribute & EFI_MEMORY_WB)) |
512 | efi_memory_uc((u64)(unsigned long)__va(phys_addr), size); | |
513 | ||
e1ad783b KP |
514 | return (void __iomem *)__va(phys_addr); |
515 | } | |
1fec0533 DY |
516 | |
517 | void __init parse_efi_setup(u64 phys_addr, u32 data_len) | |
518 | { | |
519 | efi_setup = phys_addr + sizeof(struct setup_data); | |
1fec0533 | 520 | } |
c55d016f | 521 | |
18141e89 | 522 | static int __init efi_update_mappings(efi_memory_desc_t *md, unsigned long pf) |
c55d016f | 523 | { |
6d0cc887 SP |
524 | unsigned long pfn; |
525 | pgd_t *pgd = efi_pgd; | |
18141e89 SP |
526 | int err1, err2; |
527 | ||
528 | /* Update the 1:1 mapping */ | |
529 | pfn = md->phys_addr >> PAGE_SHIFT; | |
530 | err1 = kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf); | |
531 | if (err1) { | |
532 | pr_err("Error while updating 1:1 mapping PA 0x%llx -> VA 0x%llx!\n", | |
533 | md->phys_addr, md->virt_addr); | |
534 | } | |
535 | ||
536 | err2 = kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf); | |
537 | if (err2) { | |
538 | pr_err("Error while updating VA mapping PA 0x%llx -> VA 0x%llx!\n", | |
539 | md->phys_addr, md->virt_addr); | |
540 | } | |
541 | ||
542 | return err1 || err2; | |
543 | } | |
544 | ||
545 | static int __init efi_update_mem_attr(struct mm_struct *mm, efi_memory_desc_t *md) | |
546 | { | |
547 | unsigned long pf = 0; | |
548 | ||
549 | if (md->attribute & EFI_MEMORY_XP) | |
550 | pf |= _PAGE_NX; | |
551 | ||
552 | if (!(md->attribute & EFI_MEMORY_RO)) | |
553 | pf |= _PAGE_RW; | |
554 | ||
1379edd5 TL |
555 | if (sev_active()) |
556 | pf |= _PAGE_ENC; | |
557 | ||
18141e89 SP |
558 | return efi_update_mappings(md, pf); |
559 | } | |
560 | ||
561 | void __init efi_runtime_update_mappings(void) | |
562 | { | |
6d0cc887 | 563 | efi_memory_desc_t *md; |
6d0cc887 SP |
564 | |
565 | if (efi_enabled(EFI_OLD_MEMMAP)) { | |
566 | if (__supported_pte_mask & _PAGE_NX) | |
567 | runtime_code_page_mkexec(); | |
568 | return; | |
569 | } | |
570 | ||
18141e89 SP |
571 | /* |
572 | * Use the EFI Memory Attribute Table for mapping permissions if it | |
573 | * exists, since it is intended to supersede EFI_PROPERTIES_TABLE. | |
574 | */ | |
575 | if (efi_enabled(EFI_MEM_ATTR)) { | |
576 | efi_memattr_apply_permissions(NULL, efi_update_mem_attr); | |
577 | return; | |
578 | } | |
579 | ||
580 | /* | |
581 | * EFI_MEMORY_ATTRIBUTES_TABLE is intended to replace | |
582 | * EFI_PROPERTIES_TABLE. So, use EFI_PROPERTIES_TABLE to update | |
583 | * permissions only if EFI_MEMORY_ATTRIBUTES_TABLE is not | |
584 | * published by the firmware. Even if we find a buggy implementation of | |
585 | * EFI_MEMORY_ATTRIBUTES_TABLE, don't fall back to | |
586 | * EFI_PROPERTIES_TABLE, because of the same reason. | |
587 | */ | |
588 | ||
6d0cc887 | 589 | if (!efi_enabled(EFI_NX_PE_DATA)) |
c55d016f BP |
590 | return; |
591 | ||
78ce248f | 592 | for_each_efi_memory_desc(md) { |
6d0cc887 | 593 | unsigned long pf = 0; |
6d0cc887 SP |
594 | |
595 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) | |
596 | continue; | |
597 | ||
598 | if (!(md->attribute & EFI_MEMORY_WB)) | |
599 | pf |= _PAGE_PCD; | |
600 | ||
601 | if ((md->attribute & EFI_MEMORY_XP) || | |
602 | (md->type == EFI_RUNTIME_SERVICES_DATA)) | |
603 | pf |= _PAGE_NX; | |
604 | ||
605 | if (!(md->attribute & EFI_MEMORY_RO) && | |
606 | (md->type != EFI_RUNTIME_SERVICES_CODE)) | |
607 | pf |= _PAGE_RW; | |
608 | ||
1379edd5 TL |
609 | if (sev_active()) |
610 | pf |= _PAGE_ENC; | |
611 | ||
18141e89 | 612 | efi_update_mappings(md, pf); |
6d0cc887 | 613 | } |
c55d016f | 614 | } |
11cc8512 BP |
615 | |
616 | void __init efi_dump_pagetable(void) | |
617 | { | |
618 | #ifdef CONFIG_EFI_PGT_DUMP | |
ac81d3de SP |
619 | if (efi_enabled(EFI_OLD_MEMMAP)) |
620 | ptdump_walk_pgd_level(NULL, swapper_pg_dir); | |
621 | else | |
622 | ptdump_walk_pgd_level(NULL, efi_pgd); | |
11cc8512 BP |
623 | #endif |
624 | } | |
994448f1 | 625 | |
4f9dbcfc MF |
626 | #ifdef CONFIG_EFI_MIXED |
627 | extern efi_status_t efi64_thunk(u32, ...); | |
628 | ||
629 | #define runtime_service32(func) \ | |
630 | ({ \ | |
631 | u32 table = (u32)(unsigned long)efi.systab; \ | |
632 | u32 *rt, *___f; \ | |
633 | \ | |
634 | rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime)); \ | |
635 | ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \ | |
636 | *___f; \ | |
637 | }) | |
638 | ||
639 | /* | |
640 | * Switch to the EFI page tables early so that we can access the 1:1 | |
641 | * runtime services mappings which are not mapped in any other page | |
642 | * tables. This function must be called before runtime_service32(). | |
643 | * | |
644 | * Also, disable interrupts because the IDT points to 64-bit handlers, | |
645 | * which aren't going to function correctly when we switch to 32-bit. | |
646 | */ | |
647 | #define efi_thunk(f, ...) \ | |
648 | ({ \ | |
649 | efi_status_t __s; \ | |
21f86625 AT |
650 | unsigned long __flags; \ |
651 | u32 __func; \ | |
4f9dbcfc | 652 | \ |
21f86625 AT |
653 | local_irq_save(__flags); \ |
654 | arch_efi_call_virt_setup(); \ | |
4f9dbcfc | 655 | \ |
21f86625 AT |
656 | __func = runtime_service32(f); \ |
657 | __s = efi64_thunk(__func, __VA_ARGS__); \ | |
4f9dbcfc | 658 | \ |
21f86625 AT |
659 | arch_efi_call_virt_teardown(); \ |
660 | local_irq_restore(__flags); \ | |
4f9dbcfc MF |
661 | \ |
662 | __s; \ | |
663 | }) | |
664 | ||
665 | efi_status_t efi_thunk_set_virtual_address_map( | |
666 | void *phys_set_virtual_address_map, | |
667 | unsigned long memory_map_size, | |
668 | unsigned long descriptor_size, | |
669 | u32 descriptor_version, | |
670 | efi_memory_desc_t *virtual_map) | |
671 | { | |
672 | efi_status_t status; | |
673 | unsigned long flags; | |
674 | u32 func; | |
675 | ||
676 | efi_sync_low_kernel_mappings(); | |
677 | local_irq_save(flags); | |
678 | ||
6c690ee1 | 679 | efi_scratch.prev_cr3 = __read_cr3(); |
4f9dbcfc MF |
680 | write_cr3((unsigned long)efi_scratch.efi_pgt); |
681 | __flush_tlb_all(); | |
682 | ||
683 | func = (u32)(unsigned long)phys_set_virtual_address_map; | |
684 | status = efi64_thunk(func, memory_map_size, descriptor_size, | |
685 | descriptor_version, virtual_map); | |
686 | ||
687 | write_cr3(efi_scratch.prev_cr3); | |
688 | __flush_tlb_all(); | |
689 | local_irq_restore(flags); | |
690 | ||
691 | return status; | |
692 | } | |
693 | ||
694 | static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc) | |
695 | { | |
696 | efi_status_t status; | |
697 | u32 phys_tm, phys_tc; | |
698 | ||
699 | spin_lock(&rtc_lock); | |
700 | ||
f6697df3 MF |
701 | phys_tm = virt_to_phys_or_null(tm); |
702 | phys_tc = virt_to_phys_or_null(tc); | |
4f9dbcfc MF |
703 | |
704 | status = efi_thunk(get_time, phys_tm, phys_tc); | |
705 | ||
706 | spin_unlock(&rtc_lock); | |
707 | ||
708 | return status; | |
709 | } | |
710 | ||
711 | static efi_status_t efi_thunk_set_time(efi_time_t *tm) | |
712 | { | |
713 | efi_status_t status; | |
714 | u32 phys_tm; | |
715 | ||
716 | spin_lock(&rtc_lock); | |
717 | ||
f6697df3 | 718 | phys_tm = virt_to_phys_or_null(tm); |
4f9dbcfc MF |
719 | |
720 | status = efi_thunk(set_time, phys_tm); | |
721 | ||
722 | spin_unlock(&rtc_lock); | |
723 | ||
724 | return status; | |
725 | } | |
726 | ||
727 | static efi_status_t | |
728 | efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending, | |
729 | efi_time_t *tm) | |
730 | { | |
731 | efi_status_t status; | |
732 | u32 phys_enabled, phys_pending, phys_tm; | |
733 | ||
734 | spin_lock(&rtc_lock); | |
735 | ||
f6697df3 MF |
736 | phys_enabled = virt_to_phys_or_null(enabled); |
737 | phys_pending = virt_to_phys_or_null(pending); | |
738 | phys_tm = virt_to_phys_or_null(tm); | |
4f9dbcfc MF |
739 | |
740 | status = efi_thunk(get_wakeup_time, phys_enabled, | |
741 | phys_pending, phys_tm); | |
742 | ||
743 | spin_unlock(&rtc_lock); | |
744 | ||
745 | return status; | |
746 | } | |
747 | ||
748 | static efi_status_t | |
749 | efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
750 | { | |
751 | efi_status_t status; | |
752 | u32 phys_tm; | |
753 | ||
754 | spin_lock(&rtc_lock); | |
755 | ||
f6697df3 | 756 | phys_tm = virt_to_phys_or_null(tm); |
4f9dbcfc MF |
757 | |
758 | status = efi_thunk(set_wakeup_time, enabled, phys_tm); | |
759 | ||
760 | spin_unlock(&rtc_lock); | |
761 | ||
762 | return status; | |
763 | } | |
764 | ||
f6697df3 MF |
765 | static unsigned long efi_name_size(efi_char16_t *name) |
766 | { | |
767 | return ucs2_strsize(name, EFI_VAR_NAME_LEN) + 1; | |
768 | } | |
4f9dbcfc MF |
769 | |
770 | static efi_status_t | |
771 | efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor, | |
772 | u32 *attr, unsigned long *data_size, void *data) | |
773 | { | |
774 | efi_status_t status; | |
775 | u32 phys_name, phys_vendor, phys_attr; | |
776 | u32 phys_data_size, phys_data; | |
777 | ||
f6697df3 MF |
778 | phys_data_size = virt_to_phys_or_null(data_size); |
779 | phys_vendor = virt_to_phys_or_null(vendor); | |
780 | phys_name = virt_to_phys_or_null_size(name, efi_name_size(name)); | |
781 | phys_attr = virt_to_phys_or_null(attr); | |
782 | phys_data = virt_to_phys_or_null_size(data, *data_size); | |
4f9dbcfc MF |
783 | |
784 | status = efi_thunk(get_variable, phys_name, phys_vendor, | |
785 | phys_attr, phys_data_size, phys_data); | |
786 | ||
787 | return status; | |
788 | } | |
789 | ||
790 | static efi_status_t | |
791 | efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor, | |
792 | u32 attr, unsigned long data_size, void *data) | |
793 | { | |
794 | u32 phys_name, phys_vendor, phys_data; | |
795 | efi_status_t status; | |
796 | ||
f6697df3 MF |
797 | phys_name = virt_to_phys_or_null_size(name, efi_name_size(name)); |
798 | phys_vendor = virt_to_phys_or_null(vendor); | |
799 | phys_data = virt_to_phys_or_null_size(data, data_size); | |
4f9dbcfc MF |
800 | |
801 | /* If data_size is > sizeof(u32) we've got problems */ | |
802 | status = efi_thunk(set_variable, phys_name, phys_vendor, | |
803 | attr, data_size, phys_data); | |
804 | ||
805 | return status; | |
806 | } | |
807 | ||
808 | static efi_status_t | |
809 | efi_thunk_get_next_variable(unsigned long *name_size, | |
810 | efi_char16_t *name, | |
811 | efi_guid_t *vendor) | |
812 | { | |
813 | efi_status_t status; | |
814 | u32 phys_name_size, phys_name, phys_vendor; | |
815 | ||
f6697df3 MF |
816 | phys_name_size = virt_to_phys_or_null(name_size); |
817 | phys_vendor = virt_to_phys_or_null(vendor); | |
818 | phys_name = virt_to_phys_or_null_size(name, *name_size); | |
4f9dbcfc MF |
819 | |
820 | status = efi_thunk(get_next_variable, phys_name_size, | |
821 | phys_name, phys_vendor); | |
822 | ||
823 | return status; | |
824 | } | |
825 | ||
826 | static efi_status_t | |
827 | efi_thunk_get_next_high_mono_count(u32 *count) | |
828 | { | |
829 | efi_status_t status; | |
830 | u32 phys_count; | |
831 | ||
f6697df3 | 832 | phys_count = virt_to_phys_or_null(count); |
4f9dbcfc MF |
833 | status = efi_thunk(get_next_high_mono_count, phys_count); |
834 | ||
835 | return status; | |
836 | } | |
837 | ||
838 | static void | |
839 | efi_thunk_reset_system(int reset_type, efi_status_t status, | |
840 | unsigned long data_size, efi_char16_t *data) | |
841 | { | |
842 | u32 phys_data; | |
843 | ||
f6697df3 | 844 | phys_data = virt_to_phys_or_null_size(data, data_size); |
4f9dbcfc MF |
845 | |
846 | efi_thunk(reset_system, reset_type, status, data_size, phys_data); | |
847 | } | |
848 | ||
849 | static efi_status_t | |
850 | efi_thunk_update_capsule(efi_capsule_header_t **capsules, | |
851 | unsigned long count, unsigned long sg_list) | |
852 | { | |
853 | /* | |
854 | * To properly support this function we would need to repackage | |
855 | * 'capsules' because the firmware doesn't understand 64-bit | |
856 | * pointers. | |
857 | */ | |
858 | return EFI_UNSUPPORTED; | |
859 | } | |
860 | ||
861 | static efi_status_t | |
862 | efi_thunk_query_variable_info(u32 attr, u64 *storage_space, | |
863 | u64 *remaining_space, | |
864 | u64 *max_variable_size) | |
865 | { | |
866 | efi_status_t status; | |
867 | u32 phys_storage, phys_remaining, phys_max; | |
868 | ||
869 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
870 | return EFI_UNSUPPORTED; | |
871 | ||
f6697df3 MF |
872 | phys_storage = virt_to_phys_or_null(storage_space); |
873 | phys_remaining = virt_to_phys_or_null(remaining_space); | |
874 | phys_max = virt_to_phys_or_null(max_variable_size); | |
4f9dbcfc | 875 | |
9a11040f | 876 | status = efi_thunk(query_variable_info, attr, phys_storage, |
4f9dbcfc MF |
877 | phys_remaining, phys_max); |
878 | ||
879 | return status; | |
880 | } | |
881 | ||
882 | static efi_status_t | |
883 | efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules, | |
884 | unsigned long count, u64 *max_size, | |
885 | int *reset_type) | |
886 | { | |
887 | /* | |
888 | * To properly support this function we would need to repackage | |
889 | * 'capsules' because the firmware doesn't understand 64-bit | |
890 | * pointers. | |
891 | */ | |
892 | return EFI_UNSUPPORTED; | |
893 | } | |
894 | ||
895 | void efi_thunk_runtime_setup(void) | |
896 | { | |
897 | efi.get_time = efi_thunk_get_time; | |
898 | efi.set_time = efi_thunk_set_time; | |
899 | efi.get_wakeup_time = efi_thunk_get_wakeup_time; | |
900 | efi.set_wakeup_time = efi_thunk_set_wakeup_time; | |
901 | efi.get_variable = efi_thunk_get_variable; | |
902 | efi.get_next_variable = efi_thunk_get_next_variable; | |
903 | efi.set_variable = efi_thunk_set_variable; | |
904 | efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count; | |
905 | efi.reset_system = efi_thunk_reset_system; | |
906 | efi.query_variable_info = efi_thunk_query_variable_info; | |
907 | efi.update_capsule = efi_thunk_update_capsule; | |
908 | efi.query_capsule_caps = efi_thunk_query_capsule_caps; | |
909 | } | |
910 | #endif /* CONFIG_EFI_MIXED */ |