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> |
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> |
f6697df3 | 34 | #include <linux/ucs2_string.h> |
5b83683f HY |
35 | |
36 | #include <asm/setup.h> | |
37 | #include <asm/page.h> | |
38 | #include <asm/e820.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/tlbflush.h> | |
5b83683f HY |
41 | #include <asm/proto.h> |
42 | #include <asm/efi.h> | |
4de0d4a6 | 43 | #include <asm/cacheflush.h> |
3819cd48 | 44 | #include <asm/fixmap.h> |
d2f7cbe7 | 45 | #include <asm/realmode.h> |
4f9dbcfc | 46 | #include <asm/time.h> |
67a9108e | 47 | #include <asm/pgalloc.h> |
5b83683f | 48 | |
d2f7cbe7 BP |
49 | /* |
50 | * We allocate runtime services regions bottom-up, starting from -4G, i.e. | |
51 | * 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G. | |
52 | */ | |
8266e31e | 53 | static u64 efi_va = EFI_VA_START; |
d2f7cbe7 | 54 | |
c9f2a9a6 | 55 | struct efi_scratch efi_scratch; |
d2f7cbe7 | 56 | |
9cd2b07c | 57 | static void __init early_code_mapping_set_exec(int executable) |
5b83683f HY |
58 | { |
59 | efi_memory_desc_t *md; | |
5b83683f | 60 | |
a2172e25 HY |
61 | if (!(__supported_pte_mask & _PAGE_NX)) |
62 | return; | |
63 | ||
916f676f | 64 | /* Make EFI service code area executable */ |
78ce248f | 65 | for_each_efi_memory_desc(md) { |
916f676f MG |
66 | if (md->type == EFI_RUNTIME_SERVICES_CODE || |
67 | md->type == EFI_BOOT_SERVICES_CODE) | |
9cd2b07c | 68 | efi_set_executable(md, executable); |
5b83683f HY |
69 | } |
70 | } | |
71 | ||
744937b0 | 72 | pgd_t * __init efi_call_phys_prolog(void) |
5b83683f HY |
73 | { |
74 | unsigned long vaddress; | |
744937b0 IM |
75 | pgd_t *save_pgd; |
76 | ||
b8f2c21d NZ |
77 | int pgd; |
78 | int n_pgds; | |
5b83683f | 79 | |
c9f2a9a6 MF |
80 | if (!efi_enabled(EFI_OLD_MEMMAP)) { |
81 | save_pgd = (pgd_t *)read_cr3(); | |
82 | write_cr3((unsigned long)efi_scratch.efi_pgt); | |
83 | goto out; | |
84 | } | |
d2f7cbe7 | 85 | |
9cd2b07c | 86 | early_code_mapping_set_exec(1); |
b8f2c21d NZ |
87 | |
88 | n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE); | |
20ebc15e | 89 | save_pgd = kmalloc_array(n_pgds, sizeof(*save_pgd), GFP_KERNEL); |
b8f2c21d NZ |
90 | |
91 | for (pgd = 0; pgd < n_pgds; pgd++) { | |
92 | save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE); | |
93 | vaddress = (unsigned long)__va(pgd * PGDIR_SIZE); | |
94 | set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress)); | |
95 | } | |
c9f2a9a6 | 96 | out: |
5b83683f | 97 | __flush_tlb_all(); |
744937b0 IM |
98 | |
99 | return save_pgd; | |
5b83683f HY |
100 | } |
101 | ||
744937b0 | 102 | void __init efi_call_phys_epilog(pgd_t *save_pgd) |
5b83683f HY |
103 | { |
104 | /* | |
105 | * After the lock is released, the original page table is restored. | |
106 | */ | |
744937b0 IM |
107 | int pgd_idx; |
108 | int nr_pgds; | |
d2f7cbe7 | 109 | |
c9f2a9a6 MF |
110 | if (!efi_enabled(EFI_OLD_MEMMAP)) { |
111 | write_cr3((unsigned long)save_pgd); | |
112 | __flush_tlb_all(); | |
d2f7cbe7 | 113 | return; |
c9f2a9a6 | 114 | } |
d2f7cbe7 | 115 | |
744937b0 IM |
116 | nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE); |
117 | ||
118 | for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++) | |
119 | set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]); | |
120 | ||
b8f2c21d | 121 | kfree(save_pgd); |
744937b0 | 122 | |
5b83683f | 123 | __flush_tlb_all(); |
9cd2b07c | 124 | early_code_mapping_set_exec(0); |
5b83683f | 125 | } |
e1ad783b | 126 | |
67a9108e MF |
127 | static pgd_t *efi_pgd; |
128 | ||
129 | /* | |
130 | * We need our own copy of the higher levels of the page tables | |
131 | * because we want to avoid inserting EFI region mappings (EFI_VA_END | |
132 | * to EFI_VA_START) into the standard kernel page tables. Everything | |
133 | * else can be shared, see efi_sync_low_kernel_mappings(). | |
134 | */ | |
135 | int __init efi_alloc_page_tables(void) | |
136 | { | |
137 | pgd_t *pgd; | |
138 | pud_t *pud; | |
139 | gfp_t gfp_mask; | |
140 | ||
141 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
142 | return 0; | |
143 | ||
f58f230a | 144 | gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO; |
67a9108e MF |
145 | efi_pgd = (pgd_t *)__get_free_page(gfp_mask); |
146 | if (!efi_pgd) | |
147 | return -ENOMEM; | |
148 | ||
149 | pgd = efi_pgd + pgd_index(EFI_VA_END); | |
150 | ||
151 | pud = pud_alloc_one(NULL, 0); | |
152 | if (!pud) { | |
153 | free_page((unsigned long)efi_pgd); | |
154 | return -ENOMEM; | |
155 | } | |
156 | ||
157 | pgd_populate(NULL, pgd, pud); | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
d2f7cbe7 BP |
162 | /* |
163 | * Add low kernel mappings for passing arguments to EFI functions. | |
164 | */ | |
165 | void efi_sync_low_kernel_mappings(void) | |
166 | { | |
67a9108e MF |
167 | unsigned num_entries; |
168 | pgd_t *pgd_k, *pgd_efi; | |
e0c4f675 | 169 | p4d_t *p4d_k, *p4d_efi; |
67a9108e | 170 | pud_t *pud_k, *pud_efi; |
d2f7cbe7 BP |
171 | |
172 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
173 | return; | |
174 | ||
67a9108e MF |
175 | /* |
176 | * We can share all PGD entries apart from the one entry that | |
177 | * covers the EFI runtime mapping space. | |
178 | * | |
179 | * Make sure the EFI runtime region mappings are guaranteed to | |
180 | * only span a single PGD entry and that the entry also maps | |
181 | * other important kernel regions. | |
182 | */ | |
183 | BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END)); | |
184 | BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) != | |
185 | (EFI_VA_END & PGDIR_MASK)); | |
186 | ||
187 | pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET); | |
188 | pgd_k = pgd_offset_k(PAGE_OFFSET); | |
189 | ||
190 | num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET); | |
191 | memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries); | |
d2f7cbe7 | 192 | |
67a9108e MF |
193 | /* |
194 | * We share all the PUD entries apart from those that map the | |
195 | * EFI regions. Copy around them. | |
196 | */ | |
197 | BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0); | |
198 | BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0); | |
199 | ||
200 | pgd_efi = efi_pgd + pgd_index(EFI_VA_END); | |
e0c4f675 KS |
201 | p4d_efi = p4d_offset(pgd_efi, 0); |
202 | pud_efi = pud_offset(p4d_efi, 0); | |
67a9108e MF |
203 | |
204 | pgd_k = pgd_offset_k(EFI_VA_END); | |
e0c4f675 KS |
205 | p4d_k = p4d_offset(pgd_k, 0); |
206 | pud_k = pud_offset(p4d_k, 0); | |
67a9108e MF |
207 | |
208 | num_entries = pud_index(EFI_VA_END); | |
209 | memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries); | |
210 | ||
e0c4f675 KS |
211 | p4d_efi = p4d_offset(pgd_efi, EFI_VA_START); |
212 | pud_efi = pud_offset(p4d_efi, EFI_VA_START); | |
213 | p4d_k = p4d_offset(pgd_k, EFI_VA_START); | |
214 | pud_k = pud_offset(p4d_k, EFI_VA_START); | |
67a9108e MF |
215 | |
216 | num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START); | |
217 | memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries); | |
d2f7cbe7 BP |
218 | } |
219 | ||
f6697df3 MF |
220 | /* |
221 | * Wrapper for slow_virt_to_phys() that handles NULL addresses. | |
222 | */ | |
223 | static inline phys_addr_t | |
224 | virt_to_phys_or_null_size(void *va, unsigned long size) | |
225 | { | |
226 | bool bad_size; | |
227 | ||
228 | if (!va) | |
229 | return 0; | |
230 | ||
231 | if (virt_addr_valid(va)) | |
232 | return virt_to_phys(va); | |
233 | ||
234 | /* | |
235 | * A fully aligned variable on the stack is guaranteed not to | |
236 | * cross a page bounary. Try to catch strings on the stack by | |
237 | * checking that 'size' is a power of two. | |
238 | */ | |
239 | bad_size = size > PAGE_SIZE || !is_power_of_2(size); | |
240 | ||
241 | WARN_ON(!IS_ALIGNED((unsigned long)va, size) || bad_size); | |
242 | ||
243 | return slow_virt_to_phys(va); | |
244 | } | |
245 | ||
246 | #define virt_to_phys_or_null(addr) \ | |
247 | virt_to_phys_or_null_size((addr), sizeof(*(addr))) | |
248 | ||
4e78eb05 | 249 | int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) |
d2f7cbe7 | 250 | { |
edc3b912 | 251 | unsigned long pfn, text; |
4f9dbcfc | 252 | struct page *page; |
994448f1 | 253 | unsigned npages; |
b7b898ae BP |
254 | pgd_t *pgd; |
255 | ||
256 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
257 | return 0; | |
258 | ||
67a9108e MF |
259 | efi_scratch.efi_pgt = (pgd_t *)__pa(efi_pgd); |
260 | pgd = efi_pgd; | |
d2f7cbe7 | 261 | |
b7b898ae BP |
262 | /* |
263 | * It can happen that the physical address of new_memmap lands in memory | |
264 | * which is not mapped in the EFI page table. Therefore we need to go | |
265 | * and ident-map those pages containing the map before calling | |
266 | * phys_efi_set_virtual_address_map(). | |
267 | */ | |
edc3b912 | 268 | pfn = pa_memmap >> PAGE_SHIFT; |
15f003d2 | 269 | if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX | _PAGE_RW)) { |
b7b898ae BP |
270 | pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap); |
271 | return 1; | |
272 | } | |
273 | ||
274 | efi_scratch.use_pgd = true; | |
275 | ||
bf29bddf JK |
276 | /* |
277 | * Certain firmware versions are way too sentimential and still believe | |
278 | * they are exclusive and unquestionable owners of the first physical page, | |
279 | * even though they explicitly mark it as EFI_CONVENTIONAL_MEMORY | |
280 | * (but then write-access it later during SetVirtualAddressMap()). | |
281 | * | |
282 | * Create a 1:1 mapping for this page, to avoid triple faults during early | |
283 | * boot with such firmware. We are free to hand this page to the BIOS, | |
284 | * as trim_bios_range() will reserve the first page and isolate it away | |
285 | * from memory allocators anyway. | |
286 | */ | |
287 | if (kernel_map_pages_in_pgd(pgd, 0x0, 0x0, 1, _PAGE_RW)) { | |
288 | pr_err("Failed to create 1:1 mapping for the first page!\n"); | |
289 | return 1; | |
290 | } | |
291 | ||
4f9dbcfc MF |
292 | /* |
293 | * When making calls to the firmware everything needs to be 1:1 | |
294 | * mapped and addressable with 32-bit pointers. Map the kernel | |
295 | * text and allocate a new stack because we can't rely on the | |
296 | * stack pointer being < 4GB. | |
297 | */ | |
12976670 | 298 | if (!IS_ENABLED(CONFIG_EFI_MIXED) || efi_is_native()) |
994448f1 | 299 | return 0; |
4f9dbcfc MF |
300 | |
301 | page = alloc_page(GFP_KERNEL|__GFP_DMA32); | |
302 | if (!page) | |
303 | panic("Unable to allocate EFI runtime stack < 4GB\n"); | |
304 | ||
305 | efi_scratch.phys_stack = virt_to_phys(page_address(page)); | |
306 | efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */ | |
307 | ||
2ad510dc | 308 | npages = (_etext - _text) >> PAGE_SHIFT; |
4f9dbcfc | 309 | text = __pa(_text); |
edc3b912 | 310 | pfn = text >> PAGE_SHIFT; |
4f9dbcfc | 311 | |
15f003d2 | 312 | if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, _PAGE_RW)) { |
4f9dbcfc | 313 | pr_err("Failed to map kernel text 1:1\n"); |
994448f1 | 314 | return 1; |
4f9dbcfc | 315 | } |
b7b898ae BP |
316 | |
317 | return 0; | |
318 | } | |
319 | ||
d2f7cbe7 BP |
320 | static void __init __map_region(efi_memory_desc_t *md, u64 va) |
321 | { | |
15f003d2 | 322 | unsigned long flags = _PAGE_RW; |
edc3b912 | 323 | unsigned long pfn; |
67a9108e | 324 | pgd_t *pgd = efi_pgd; |
d2f7cbe7 BP |
325 | |
326 | if (!(md->attribute & EFI_MEMORY_WB)) | |
edc3b912 | 327 | flags |= _PAGE_PCD; |
d2f7cbe7 | 328 | |
edc3b912 MF |
329 | pfn = md->phys_addr >> PAGE_SHIFT; |
330 | if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags)) | |
d2f7cbe7 BP |
331 | pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", |
332 | md->phys_addr, va); | |
333 | } | |
334 | ||
335 | void __init efi_map_region(efi_memory_desc_t *md) | |
336 | { | |
337 | unsigned long size = md->num_pages << PAGE_SHIFT; | |
338 | u64 pa = md->phys_addr; | |
339 | ||
340 | if (efi_enabled(EFI_OLD_MEMMAP)) | |
341 | return old_map_region(md); | |
342 | ||
343 | /* | |
344 | * Make sure the 1:1 mappings are present as a catch-all for b0rked | |
345 | * firmware which doesn't update all internal pointers after switching | |
346 | * to virtual mode and would otherwise crap on us. | |
347 | */ | |
348 | __map_region(md, md->phys_addr); | |
349 | ||
4f9dbcfc MF |
350 | /* |
351 | * Enforce the 1:1 mapping as the default virtual address when | |
352 | * booting in EFI mixed mode, because even though we may be | |
353 | * running a 64-bit kernel, the firmware may only be 32-bit. | |
354 | */ | |
355 | if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) { | |
356 | md->virt_addr = md->phys_addr; | |
357 | return; | |
358 | } | |
359 | ||
d2f7cbe7 BP |
360 | efi_va -= size; |
361 | ||
362 | /* Is PA 2M-aligned? */ | |
363 | if (!(pa & (PMD_SIZE - 1))) { | |
364 | efi_va &= PMD_MASK; | |
365 | } else { | |
366 | u64 pa_offset = pa & (PMD_SIZE - 1); | |
367 | u64 prev_va = efi_va; | |
368 | ||
369 | /* get us the same offset within this 2M page */ | |
370 | efi_va = (efi_va & PMD_MASK) + pa_offset; | |
371 | ||
372 | if (efi_va > prev_va) | |
373 | efi_va -= PMD_SIZE; | |
374 | } | |
375 | ||
376 | if (efi_va < EFI_VA_END) { | |
377 | pr_warn(FW_WARN "VA address range overflow!\n"); | |
378 | return; | |
379 | } | |
380 | ||
381 | /* Do the VA map */ | |
382 | __map_region(md, efi_va); | |
383 | md->virt_addr = efi_va; | |
384 | } | |
385 | ||
3b266496 DY |
386 | /* |
387 | * kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges. | |
388 | * md->virt_addr is the original virtual address which had been mapped in kexec | |
389 | * 1st kernel. | |
390 | */ | |
391 | void __init efi_map_region_fixed(efi_memory_desc_t *md) | |
392 | { | |
0513fe1d | 393 | __map_region(md, md->phys_addr); |
3b266496 DY |
394 | __map_region(md, md->virt_addr); |
395 | } | |
396 | ||
e1ad783b | 397 | void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size, |
3e8fa263 | 398 | u32 type, u64 attribute) |
e1ad783b KP |
399 | { |
400 | unsigned long last_map_pfn; | |
401 | ||
402 | if (type == EFI_MEMORY_MAPPED_IO) | |
403 | return ioremap(phys_addr, size); | |
404 | ||
405 | last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size); | |
406 | if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) { | |
407 | unsigned long top = last_map_pfn << PAGE_SHIFT; | |
3e8fa263 | 408 | efi_ioremap(top, size - (top - phys_addr), type, attribute); |
e1ad783b KP |
409 | } |
410 | ||
3e8fa263 MF |
411 | if (!(attribute & EFI_MEMORY_WB)) |
412 | efi_memory_uc((u64)(unsigned long)__va(phys_addr), size); | |
413 | ||
e1ad783b KP |
414 | return (void __iomem *)__va(phys_addr); |
415 | } | |
1fec0533 DY |
416 | |
417 | void __init parse_efi_setup(u64 phys_addr, u32 data_len) | |
418 | { | |
419 | efi_setup = phys_addr + sizeof(struct setup_data); | |
1fec0533 | 420 | } |
c55d016f | 421 | |
18141e89 | 422 | static int __init efi_update_mappings(efi_memory_desc_t *md, unsigned long pf) |
c55d016f | 423 | { |
6d0cc887 SP |
424 | unsigned long pfn; |
425 | pgd_t *pgd = efi_pgd; | |
18141e89 SP |
426 | int err1, err2; |
427 | ||
428 | /* Update the 1:1 mapping */ | |
429 | pfn = md->phys_addr >> PAGE_SHIFT; | |
430 | err1 = kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf); | |
431 | if (err1) { | |
432 | pr_err("Error while updating 1:1 mapping PA 0x%llx -> VA 0x%llx!\n", | |
433 | md->phys_addr, md->virt_addr); | |
434 | } | |
435 | ||
436 | err2 = kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf); | |
437 | if (err2) { | |
438 | pr_err("Error while updating VA mapping PA 0x%llx -> VA 0x%llx!\n", | |
439 | md->phys_addr, md->virt_addr); | |
440 | } | |
441 | ||
442 | return err1 || err2; | |
443 | } | |
444 | ||
445 | static int __init efi_update_mem_attr(struct mm_struct *mm, efi_memory_desc_t *md) | |
446 | { | |
447 | unsigned long pf = 0; | |
448 | ||
449 | if (md->attribute & EFI_MEMORY_XP) | |
450 | pf |= _PAGE_NX; | |
451 | ||
452 | if (!(md->attribute & EFI_MEMORY_RO)) | |
453 | pf |= _PAGE_RW; | |
454 | ||
455 | return efi_update_mappings(md, pf); | |
456 | } | |
457 | ||
458 | void __init efi_runtime_update_mappings(void) | |
459 | { | |
6d0cc887 | 460 | efi_memory_desc_t *md; |
6d0cc887 SP |
461 | |
462 | if (efi_enabled(EFI_OLD_MEMMAP)) { | |
463 | if (__supported_pte_mask & _PAGE_NX) | |
464 | runtime_code_page_mkexec(); | |
465 | return; | |
466 | } | |
467 | ||
18141e89 SP |
468 | /* |
469 | * Use the EFI Memory Attribute Table for mapping permissions if it | |
470 | * exists, since it is intended to supersede EFI_PROPERTIES_TABLE. | |
471 | */ | |
472 | if (efi_enabled(EFI_MEM_ATTR)) { | |
473 | efi_memattr_apply_permissions(NULL, efi_update_mem_attr); | |
474 | return; | |
475 | } | |
476 | ||
477 | /* | |
478 | * EFI_MEMORY_ATTRIBUTES_TABLE is intended to replace | |
479 | * EFI_PROPERTIES_TABLE. So, use EFI_PROPERTIES_TABLE to update | |
480 | * permissions only if EFI_MEMORY_ATTRIBUTES_TABLE is not | |
481 | * published by the firmware. Even if we find a buggy implementation of | |
482 | * EFI_MEMORY_ATTRIBUTES_TABLE, don't fall back to | |
483 | * EFI_PROPERTIES_TABLE, because of the same reason. | |
484 | */ | |
485 | ||
6d0cc887 | 486 | if (!efi_enabled(EFI_NX_PE_DATA)) |
c55d016f BP |
487 | return; |
488 | ||
78ce248f | 489 | for_each_efi_memory_desc(md) { |
6d0cc887 | 490 | unsigned long pf = 0; |
6d0cc887 SP |
491 | |
492 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) | |
493 | continue; | |
494 | ||
495 | if (!(md->attribute & EFI_MEMORY_WB)) | |
496 | pf |= _PAGE_PCD; | |
497 | ||
498 | if ((md->attribute & EFI_MEMORY_XP) || | |
499 | (md->type == EFI_RUNTIME_SERVICES_DATA)) | |
500 | pf |= _PAGE_NX; | |
501 | ||
502 | if (!(md->attribute & EFI_MEMORY_RO) && | |
503 | (md->type != EFI_RUNTIME_SERVICES_CODE)) | |
504 | pf |= _PAGE_RW; | |
505 | ||
18141e89 | 506 | efi_update_mappings(md, pf); |
6d0cc887 | 507 | } |
c55d016f | 508 | } |
11cc8512 BP |
509 | |
510 | void __init efi_dump_pagetable(void) | |
511 | { | |
512 | #ifdef CONFIG_EFI_PGT_DUMP | |
67a9108e | 513 | ptdump_walk_pgd_level(NULL, efi_pgd); |
11cc8512 BP |
514 | #endif |
515 | } | |
994448f1 | 516 | |
4f9dbcfc MF |
517 | #ifdef CONFIG_EFI_MIXED |
518 | extern efi_status_t efi64_thunk(u32, ...); | |
519 | ||
520 | #define runtime_service32(func) \ | |
521 | ({ \ | |
522 | u32 table = (u32)(unsigned long)efi.systab; \ | |
523 | u32 *rt, *___f; \ | |
524 | \ | |
525 | rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime)); \ | |
526 | ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \ | |
527 | *___f; \ | |
528 | }) | |
529 | ||
530 | /* | |
531 | * Switch to the EFI page tables early so that we can access the 1:1 | |
532 | * runtime services mappings which are not mapped in any other page | |
533 | * tables. This function must be called before runtime_service32(). | |
534 | * | |
535 | * Also, disable interrupts because the IDT points to 64-bit handlers, | |
536 | * which aren't going to function correctly when we switch to 32-bit. | |
537 | */ | |
538 | #define efi_thunk(f, ...) \ | |
539 | ({ \ | |
540 | efi_status_t __s; \ | |
21f86625 AT |
541 | unsigned long __flags; \ |
542 | u32 __func; \ | |
4f9dbcfc | 543 | \ |
21f86625 AT |
544 | local_irq_save(__flags); \ |
545 | arch_efi_call_virt_setup(); \ | |
4f9dbcfc | 546 | \ |
21f86625 AT |
547 | __func = runtime_service32(f); \ |
548 | __s = efi64_thunk(__func, __VA_ARGS__); \ | |
4f9dbcfc | 549 | \ |
21f86625 AT |
550 | arch_efi_call_virt_teardown(); \ |
551 | local_irq_restore(__flags); \ | |
4f9dbcfc MF |
552 | \ |
553 | __s; \ | |
554 | }) | |
555 | ||
556 | efi_status_t efi_thunk_set_virtual_address_map( | |
557 | void *phys_set_virtual_address_map, | |
558 | unsigned long memory_map_size, | |
559 | unsigned long descriptor_size, | |
560 | u32 descriptor_version, | |
561 | efi_memory_desc_t *virtual_map) | |
562 | { | |
563 | efi_status_t status; | |
564 | unsigned long flags; | |
565 | u32 func; | |
566 | ||
567 | efi_sync_low_kernel_mappings(); | |
568 | local_irq_save(flags); | |
569 | ||
570 | efi_scratch.prev_cr3 = read_cr3(); | |
571 | write_cr3((unsigned long)efi_scratch.efi_pgt); | |
572 | __flush_tlb_all(); | |
573 | ||
574 | func = (u32)(unsigned long)phys_set_virtual_address_map; | |
575 | status = efi64_thunk(func, memory_map_size, descriptor_size, | |
576 | descriptor_version, virtual_map); | |
577 | ||
578 | write_cr3(efi_scratch.prev_cr3); | |
579 | __flush_tlb_all(); | |
580 | local_irq_restore(flags); | |
581 | ||
582 | return status; | |
583 | } | |
584 | ||
585 | static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc) | |
586 | { | |
587 | efi_status_t status; | |
588 | u32 phys_tm, phys_tc; | |
589 | ||
590 | spin_lock(&rtc_lock); | |
591 | ||
f6697df3 MF |
592 | phys_tm = virt_to_phys_or_null(tm); |
593 | phys_tc = virt_to_phys_or_null(tc); | |
4f9dbcfc MF |
594 | |
595 | status = efi_thunk(get_time, phys_tm, phys_tc); | |
596 | ||
597 | spin_unlock(&rtc_lock); | |
598 | ||
599 | return status; | |
600 | } | |
601 | ||
602 | static efi_status_t efi_thunk_set_time(efi_time_t *tm) | |
603 | { | |
604 | efi_status_t status; | |
605 | u32 phys_tm; | |
606 | ||
607 | spin_lock(&rtc_lock); | |
608 | ||
f6697df3 | 609 | phys_tm = virt_to_phys_or_null(tm); |
4f9dbcfc MF |
610 | |
611 | status = efi_thunk(set_time, phys_tm); | |
612 | ||
613 | spin_unlock(&rtc_lock); | |
614 | ||
615 | return status; | |
616 | } | |
617 | ||
618 | static efi_status_t | |
619 | efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending, | |
620 | efi_time_t *tm) | |
621 | { | |
622 | efi_status_t status; | |
623 | u32 phys_enabled, phys_pending, phys_tm; | |
624 | ||
625 | spin_lock(&rtc_lock); | |
626 | ||
f6697df3 MF |
627 | phys_enabled = virt_to_phys_or_null(enabled); |
628 | phys_pending = virt_to_phys_or_null(pending); | |
629 | phys_tm = virt_to_phys_or_null(tm); | |
4f9dbcfc MF |
630 | |
631 | status = efi_thunk(get_wakeup_time, phys_enabled, | |
632 | phys_pending, phys_tm); | |
633 | ||
634 | spin_unlock(&rtc_lock); | |
635 | ||
636 | return status; | |
637 | } | |
638 | ||
639 | static efi_status_t | |
640 | efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
641 | { | |
642 | efi_status_t status; | |
643 | u32 phys_tm; | |
644 | ||
645 | spin_lock(&rtc_lock); | |
646 | ||
f6697df3 | 647 | phys_tm = virt_to_phys_or_null(tm); |
4f9dbcfc MF |
648 | |
649 | status = efi_thunk(set_wakeup_time, enabled, phys_tm); | |
650 | ||
651 | spin_unlock(&rtc_lock); | |
652 | ||
653 | return status; | |
654 | } | |
655 | ||
f6697df3 MF |
656 | static unsigned long efi_name_size(efi_char16_t *name) |
657 | { | |
658 | return ucs2_strsize(name, EFI_VAR_NAME_LEN) + 1; | |
659 | } | |
4f9dbcfc MF |
660 | |
661 | static efi_status_t | |
662 | efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor, | |
663 | u32 *attr, unsigned long *data_size, void *data) | |
664 | { | |
665 | efi_status_t status; | |
666 | u32 phys_name, phys_vendor, phys_attr; | |
667 | u32 phys_data_size, phys_data; | |
668 | ||
f6697df3 MF |
669 | phys_data_size = virt_to_phys_or_null(data_size); |
670 | phys_vendor = virt_to_phys_or_null(vendor); | |
671 | phys_name = virt_to_phys_or_null_size(name, efi_name_size(name)); | |
672 | phys_attr = virt_to_phys_or_null(attr); | |
673 | phys_data = virt_to_phys_or_null_size(data, *data_size); | |
4f9dbcfc MF |
674 | |
675 | status = efi_thunk(get_variable, phys_name, phys_vendor, | |
676 | phys_attr, phys_data_size, phys_data); | |
677 | ||
678 | return status; | |
679 | } | |
680 | ||
681 | static efi_status_t | |
682 | efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor, | |
683 | u32 attr, unsigned long data_size, void *data) | |
684 | { | |
685 | u32 phys_name, phys_vendor, phys_data; | |
686 | efi_status_t status; | |
687 | ||
f6697df3 MF |
688 | phys_name = virt_to_phys_or_null_size(name, efi_name_size(name)); |
689 | phys_vendor = virt_to_phys_or_null(vendor); | |
690 | phys_data = virt_to_phys_or_null_size(data, data_size); | |
4f9dbcfc MF |
691 | |
692 | /* If data_size is > sizeof(u32) we've got problems */ | |
693 | status = efi_thunk(set_variable, phys_name, phys_vendor, | |
694 | attr, data_size, phys_data); | |
695 | ||
696 | return status; | |
697 | } | |
698 | ||
699 | static efi_status_t | |
700 | efi_thunk_get_next_variable(unsigned long *name_size, | |
701 | efi_char16_t *name, | |
702 | efi_guid_t *vendor) | |
703 | { | |
704 | efi_status_t status; | |
705 | u32 phys_name_size, phys_name, phys_vendor; | |
706 | ||
f6697df3 MF |
707 | phys_name_size = virt_to_phys_or_null(name_size); |
708 | phys_vendor = virt_to_phys_or_null(vendor); | |
709 | phys_name = virt_to_phys_or_null_size(name, *name_size); | |
4f9dbcfc MF |
710 | |
711 | status = efi_thunk(get_next_variable, phys_name_size, | |
712 | phys_name, phys_vendor); | |
713 | ||
714 | return status; | |
715 | } | |
716 | ||
717 | static efi_status_t | |
718 | efi_thunk_get_next_high_mono_count(u32 *count) | |
719 | { | |
720 | efi_status_t status; | |
721 | u32 phys_count; | |
722 | ||
f6697df3 | 723 | phys_count = virt_to_phys_or_null(count); |
4f9dbcfc MF |
724 | status = efi_thunk(get_next_high_mono_count, phys_count); |
725 | ||
726 | return status; | |
727 | } | |
728 | ||
729 | static void | |
730 | efi_thunk_reset_system(int reset_type, efi_status_t status, | |
731 | unsigned long data_size, efi_char16_t *data) | |
732 | { | |
733 | u32 phys_data; | |
734 | ||
f6697df3 | 735 | phys_data = virt_to_phys_or_null_size(data, data_size); |
4f9dbcfc MF |
736 | |
737 | efi_thunk(reset_system, reset_type, status, data_size, phys_data); | |
738 | } | |
739 | ||
740 | static efi_status_t | |
741 | efi_thunk_update_capsule(efi_capsule_header_t **capsules, | |
742 | unsigned long count, unsigned long sg_list) | |
743 | { | |
744 | /* | |
745 | * To properly support this function we would need to repackage | |
746 | * 'capsules' because the firmware doesn't understand 64-bit | |
747 | * pointers. | |
748 | */ | |
749 | return EFI_UNSUPPORTED; | |
750 | } | |
751 | ||
752 | static efi_status_t | |
753 | efi_thunk_query_variable_info(u32 attr, u64 *storage_space, | |
754 | u64 *remaining_space, | |
755 | u64 *max_variable_size) | |
756 | { | |
757 | efi_status_t status; | |
758 | u32 phys_storage, phys_remaining, phys_max; | |
759 | ||
760 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
761 | return EFI_UNSUPPORTED; | |
762 | ||
f6697df3 MF |
763 | phys_storage = virt_to_phys_or_null(storage_space); |
764 | phys_remaining = virt_to_phys_or_null(remaining_space); | |
765 | phys_max = virt_to_phys_or_null(max_variable_size); | |
4f9dbcfc | 766 | |
9a11040f | 767 | status = efi_thunk(query_variable_info, attr, phys_storage, |
4f9dbcfc MF |
768 | phys_remaining, phys_max); |
769 | ||
770 | return status; | |
771 | } | |
772 | ||
773 | static efi_status_t | |
774 | efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules, | |
775 | unsigned long count, u64 *max_size, | |
776 | int *reset_type) | |
777 | { | |
778 | /* | |
779 | * To properly support this function we would need to repackage | |
780 | * 'capsules' because the firmware doesn't understand 64-bit | |
781 | * pointers. | |
782 | */ | |
783 | return EFI_UNSUPPORTED; | |
784 | } | |
785 | ||
786 | void efi_thunk_runtime_setup(void) | |
787 | { | |
788 | efi.get_time = efi_thunk_get_time; | |
789 | efi.set_time = efi_thunk_set_time; | |
790 | efi.get_wakeup_time = efi_thunk_get_wakeup_time; | |
791 | efi.set_wakeup_time = efi_thunk_set_wakeup_time; | |
792 | efi.get_variable = efi_thunk_get_variable; | |
793 | efi.get_next_variable = efi_thunk_get_next_variable; | |
794 | efi.set_variable = efi_thunk_set_variable; | |
795 | efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count; | |
796 | efi.reset_system = efi_thunk_reset_system; | |
797 | efi.query_variable_info = efi_thunk_query_variable_info; | |
798 | efi.update_capsule = efi_thunk_update_capsule; | |
799 | efi.query_capsule_caps = efi_thunk_query_capsule_caps; | |
800 | } | |
801 | #endif /* CONFIG_EFI_MIXED */ |