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Linux/arch/x86/platform/efi/efi_64.c

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  1 /*
  2  * x86_64 specific EFI support functions
  3  * Based on Extensible Firmware Interface Specification version 1.0
  4  *
  5  * Copyright (C) 2005-2008 Intel Co.
  6  *      Fenghua Yu <fenghua.yu@intel.com>
  7  *      Bibo Mao <bibo.mao@intel.com>
  8  *      Chandramouli Narayanan <mouli@linux.intel.com>
  9  *      Huang Ying <ying.huang@intel.com>
 10  *
 11  * Code to convert EFI to E820 map has been implemented in elilo bootloader
 12  * based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table
 13  * is setup appropriately for EFI runtime code.
 14  * - mouli 06/14/2007.
 15  *
 16  */
 17 
 18 #define pr_fmt(fmt) "efi: " fmt
 19 
 20 #include <linux/kernel.h>
 21 #include <linux/init.h>
 22 #include <linux/mm.h>
 23 #include <linux/types.h>
 24 #include <linux/spinlock.h>
 25 #include <linux/bootmem.h>
 26 #include <linux/ioport.h>
 27 #include <linux/init.h>
 28 #include <linux/mc146818rtc.h>
 29 #include <linux/efi.h>
 30 #include <linux/uaccess.h>
 31 #include <linux/io.h>
 32 #include <linux/reboot.h>
 33 #include <linux/slab.h>
 34 
 35 #include <asm/setup.h>
 36 #include <asm/page.h>
 37 #include <asm/e820.h>
 38 #include <asm/pgtable.h>
 39 #include <asm/tlbflush.h>
 40 #include <asm/proto.h>
 41 #include <asm/efi.h>
 42 #include <asm/cacheflush.h>
 43 #include <asm/fixmap.h>
 44 #include <asm/realmode.h>
 45 #include <asm/time.h>
 46 #include <asm/pgalloc.h>
 47 
 48 /*
 49  * We allocate runtime services regions bottom-up, starting from -4G, i.e.
 50  * 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G.
 51  */
 52 static u64 efi_va = EFI_VA_START;
 53 
 54 struct efi_scratch efi_scratch;
 55 
 56 static void __init early_code_mapping_set_exec(int executable)
 57 {
 58         efi_memory_desc_t *md;
 59 
 60         if (!(__supported_pte_mask & _PAGE_NX))
 61                 return;
 62 
 63         /* Make EFI service code area executable */
 64         for_each_efi_memory_desc(md) {
 65                 if (md->type == EFI_RUNTIME_SERVICES_CODE ||
 66                     md->type == EFI_BOOT_SERVICES_CODE)
 67                         efi_set_executable(md, executable);
 68         }
 69 }
 70 
 71 pgd_t * __init efi_call_phys_prolog(void)
 72 {
 73         unsigned long vaddress;
 74         pgd_t *save_pgd;
 75 
 76         int pgd;
 77         int n_pgds;
 78 
 79         if (!efi_enabled(EFI_OLD_MEMMAP)) {
 80                 save_pgd = (pgd_t *)read_cr3();
 81                 write_cr3((unsigned long)efi_scratch.efi_pgt);
 82                 goto out;
 83         }
 84 
 85         early_code_mapping_set_exec(1);
 86 
 87         n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
 88         save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL);
 89 
 90         for (pgd = 0; pgd < n_pgds; pgd++) {
 91                 save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE);
 92                 vaddress = (unsigned long)__va(pgd * PGDIR_SIZE);
 93                 set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress));
 94         }
 95 out:
 96         __flush_tlb_all();
 97 
 98         return save_pgd;
 99 }
100 
101 void __init efi_call_phys_epilog(pgd_t *save_pgd)
102 {
103         /*
104          * After the lock is released, the original page table is restored.
105          */
106         int pgd_idx;
107         int nr_pgds;
108 
109         if (!efi_enabled(EFI_OLD_MEMMAP)) {
110                 write_cr3((unsigned long)save_pgd);
111                 __flush_tlb_all();
112                 return;
113         }
114 
115         nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
116 
117         for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++)
118                 set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]);
119 
120         kfree(save_pgd);
121 
122         __flush_tlb_all();
123         early_code_mapping_set_exec(0);
124 }
125 
126 static pgd_t *efi_pgd;
127 
128 /*
129  * We need our own copy of the higher levels of the page tables
130  * because we want to avoid inserting EFI region mappings (EFI_VA_END
131  * to EFI_VA_START) into the standard kernel page tables. Everything
132  * else can be shared, see efi_sync_low_kernel_mappings().
133  */
134 int __init efi_alloc_page_tables(void)
135 {
136         pgd_t *pgd;
137         pud_t *pud;
138         gfp_t gfp_mask;
139 
140         if (efi_enabled(EFI_OLD_MEMMAP))
141                 return 0;
142 
143         gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO;
144         efi_pgd = (pgd_t *)__get_free_page(gfp_mask);
145         if (!efi_pgd)
146                 return -ENOMEM;
147 
148         pgd = efi_pgd + pgd_index(EFI_VA_END);
149 
150         pud = pud_alloc_one(NULL, 0);
151         if (!pud) {
152                 free_page((unsigned long)efi_pgd);
153                 return -ENOMEM;
154         }
155 
156         pgd_populate(NULL, pgd, pud);
157 
158         return 0;
159 }
160 
161 /*
162  * Add low kernel mappings for passing arguments to EFI functions.
163  */
164 void efi_sync_low_kernel_mappings(void)
165 {
166         unsigned num_entries;
167         pgd_t *pgd_k, *pgd_efi;
168         pud_t *pud_k, *pud_efi;
169 
170         if (efi_enabled(EFI_OLD_MEMMAP))
171                 return;
172 
173         /*
174          * We can share all PGD entries apart from the one entry that
175          * covers the EFI runtime mapping space.
176          *
177          * Make sure the EFI runtime region mappings are guaranteed to
178          * only span a single PGD entry and that the entry also maps
179          * other important kernel regions.
180          */
181         BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END));
182         BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) !=
183                         (EFI_VA_END & PGDIR_MASK));
184 
185         pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET);
186         pgd_k = pgd_offset_k(PAGE_OFFSET);
187 
188         num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET);
189         memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries);
190 
191         /*
192          * We share all the PUD entries apart from those that map the
193          * EFI regions. Copy around them.
194          */
195         BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0);
196         BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0);
197 
198         pgd_efi = efi_pgd + pgd_index(EFI_VA_END);
199         pud_efi = pud_offset(pgd_efi, 0);
200 
201         pgd_k = pgd_offset_k(EFI_VA_END);
202         pud_k = pud_offset(pgd_k, 0);
203 
204         num_entries = pud_index(EFI_VA_END);
205         memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
206 
207         pud_efi = pud_offset(pgd_efi, EFI_VA_START);
208         pud_k = pud_offset(pgd_k, EFI_VA_START);
209 
210         num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START);
211         memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
212 }
213 
214 int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
215 {
216         unsigned long pfn, text;
217         efi_memory_desc_t *md;
218         struct page *page;
219         unsigned npages;
220         pgd_t *pgd;
221 
222         if (efi_enabled(EFI_OLD_MEMMAP))
223                 return 0;
224 
225         efi_scratch.efi_pgt = (pgd_t *)__pa(efi_pgd);
226         pgd = efi_pgd;
227 
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          */
234         pfn = pa_memmap >> PAGE_SHIFT;
235         if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX | _PAGE_RW)) {
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 
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) || efi_is_native())
249                 return 0;
250 
251         /*
252          * Map all of RAM so that we can access arguments in the 1:1
253          * mapping when making EFI runtime calls.
254          */
255         for_each_efi_memory_desc(md) {
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 
264                 if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, npages, _PAGE_RW)) {
265                         pr_err("Failed to map 1:1 memory\n");
266                         return 1;
267                 }
268         }
269 
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 
277         npages = (_etext - _text) >> PAGE_SHIFT;
278         text = __pa(_text);
279         pfn = text >> PAGE_SHIFT;
280 
281         if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, _PAGE_RW)) {
282                 pr_err("Failed to map kernel text 1:1\n");
283                 return 1;
284         }
285 
286         return 0;
287 }
288 
289 static void __init __map_region(efi_memory_desc_t *md, u64 va)
290 {
291         unsigned long flags = _PAGE_RW;
292         unsigned long pfn;
293         pgd_t *pgd = efi_pgd;
294 
295         if (!(md->attribute & EFI_MEMORY_WB))
296                 flags |= _PAGE_PCD;
297 
298         pfn = md->phys_addr >> PAGE_SHIFT;
299         if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags))
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 
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 
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 
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 
365 void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
366                                  u32 type, u64 attribute)
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;
376                 efi_ioremap(top, size - (top - phys_addr), type, attribute);
377         }
378 
379         if (!(attribute & EFI_MEMORY_WB))
380                 efi_memory_uc((u64)(unsigned long)__va(phys_addr), size);
381 
382         return (void __iomem *)__va(phys_addr);
383 }
384 
385 void __init parse_efi_setup(u64 phys_addr, u32 data_len)
386 {
387         efi_setup = phys_addr + sizeof(struct setup_data);
388 }
389 
390 void __init efi_runtime_update_mappings(void)
391 {
392         unsigned long pfn;
393         pgd_t *pgd = efi_pgd;
394         efi_memory_desc_t *md;
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))
403                 return;
404 
405         for_each_efi_memory_desc(md) {
406                 unsigned long pf = 0;
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         }
432 }
433 
434 void __init efi_dump_pagetable(void)
435 {
436 #ifdef CONFIG_EFI_PGT_DUMP
437         ptdump_walk_pgd_level(NULL, efi_pgd);
438 #endif
439 }
440 
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;                                               \
465         unsigned long __flags;                                          \
466         u32 __func;                                                     \
467                                                                         \
468         local_irq_save(__flags);                                        \
469         arch_efi_call_virt_setup();                                     \
470                                                                         \
471         __func = runtime_service32(f);                                  \
472         __s = efi64_thunk(__func, __VA_ARGS__);                         \
473                                                                         \
474         arch_efi_call_virt_teardown();                                  \
475         local_irq_restore(__flags);                                     \
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 
687         status = efi_thunk(query_variable_info, attr, phys_storage,
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 */
722 

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