1 // SPDX-License-Identifier: GPL-2.0
3 * x86_64 specific EFI support functions
4 * Based on Extensible Firmware Interface Specification version 1.0
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>
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.
19 #define pr_fmt(fmt) "efi: " fmt
21 #include <linux/kernel.h>
22 #include <linux/init.h>
24 #include <linux/types.h>
25 #include <linux/spinlock.h>
26 #include <linux/bootmem.h>
27 #include <linux/ioport.h>
28 #include <linux/init.h>
29 #include <linux/mc146818rtc.h>
30 #include <linux/efi.h>
31 #include <linux/uaccess.h>
33 #include <linux/reboot.h>
34 #include <linux/slab.h>
35 #include <linux/ucs2_string.h>
36 #include <linux/mem_encrypt.h>
38 #include <asm/setup.h>
40 #include <asm/e820/api.h>
41 #include <asm/pgtable.h>
42 #include <asm/tlbflush.h>
43 #include <asm/proto.h>
45 #include <asm/cacheflush.h>
46 #include <asm/fixmap.h>
47 #include <asm/realmode.h>
49 #include <asm/pgalloc.h>
52 * We allocate runtime services regions top-down, starting from -4G, i.e.
53 * 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G.
55 static u64 efi_va = EFI_VA_START;
57 struct efi_scratch efi_scratch;
59 static void __init early_code_mapping_set_exec(int executable)
61 efi_memory_desc_t *md;
63 if (!(__supported_pte_mask & _PAGE_NX))
66 /* Make EFI service code area executable */
67 for_each_efi_memory_desc(md) {
68 if (md->type == EFI_RUNTIME_SERVICES_CODE ||
69 md->type == EFI_BOOT_SERVICES_CODE)
70 efi_set_executable(md, executable);
74 pgd_t * __init efi_call_phys_prolog(void)
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;
84 if (!efi_enabled(EFI_OLD_MEMMAP)) {
85 save_pgd = (pgd_t *)__read_cr3();
86 write_cr3((unsigned long)efi_scratch.efi_pgt);
90 early_code_mapping_set_exec(1);
92 n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
93 save_pgd = kmalloc_array(n_pgds, sizeof(*save_pgd), GFP_KERNEL);
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.
103 for (pgd = 0; pgd < n_pgds; pgd++) {
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;
109 p4d = p4d_alloc(&init_mm, pgd_efi, addr_pgd);
111 pr_err("Failed to allocate p4d table!\n");
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);
119 pud = pud_alloc(&init_mm, p4d_efi, addr_p4d);
121 pr_err("Failed to allocate pud table!\n");
125 for (j = 0; j < PTRS_PER_PUD; j++) {
126 addr_pud = addr_p4d + j * PUD_SIZE;
128 if (addr_pud > (max_pfn << PAGE_SHIFT))
131 vaddr = (unsigned long)__va(addr_pud);
133 pgd_k = pgd_offset_k(vaddr);
134 p4d_k = p4d_offset(pgd_k, vaddr);
135 pud[j] = *pud_offset(p4d_k, vaddr);
145 void __init efi_call_phys_epilog(pgd_t *save_pgd)
148 * After the lock is released, the original page table is restored.
156 if (!efi_enabled(EFI_OLD_MEMMAP)) {
157 write_cr3((unsigned long)save_pgd);
162 nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
164 for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++) {
165 pgd = pgd_offset_k(pgd_idx * PGDIR_SIZE);
166 set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]);
168 if (!(pgd_val(*pgd) & _PAGE_PRESENT))
171 for (i = 0; i < PTRS_PER_P4D; i++) {
172 p4d = p4d_offset(pgd,
173 pgd_idx * PGDIR_SIZE + i * P4D_SIZE);
175 if (!(p4d_val(*p4d) & _PAGE_PRESENT))
178 pud = (pud_t *)p4d_page_vaddr(*p4d);
179 pud_free(&init_mm, pud);
182 p4d = (p4d_t *)pgd_page_vaddr(*pgd);
183 p4d_free(&init_mm, p4d);
189 early_code_mapping_set_exec(0);
192 static pgd_t *efi_pgd;
195 * We need our own copy of the higher levels of the page tables
196 * because we want to avoid inserting EFI region mappings (EFI_VA_END
197 * to EFI_VA_START) into the standard kernel page tables. Everything
198 * else can be shared, see efi_sync_low_kernel_mappings().
200 * We don't want the pgd on the pgd_list and cannot use pgd_alloc() for the
203 int __init efi_alloc_page_tables(void)
210 if (efi_enabled(EFI_OLD_MEMMAP))
213 gfp_mask = GFP_KERNEL | __GFP_ZERO;
214 efi_pgd = (pgd_t *)__get_free_pages(gfp_mask, PGD_ALLOCATION_ORDER);
218 pgd = efi_pgd + pgd_index(EFI_VA_END);
219 p4d = p4d_alloc(&init_mm, pgd, EFI_VA_END);
221 free_page((unsigned long)efi_pgd);
225 pud = pud_alloc(&init_mm, p4d, EFI_VA_END);
227 if (CONFIG_PGTABLE_LEVELS > 4)
228 free_page((unsigned long) pgd_page_vaddr(*pgd));
229 free_page((unsigned long)efi_pgd);
237 * Add low kernel mappings for passing arguments to EFI functions.
239 void efi_sync_low_kernel_mappings(void)
241 unsigned num_entries;
242 pgd_t *pgd_k, *pgd_efi;
243 p4d_t *p4d_k, *p4d_efi;
244 pud_t *pud_k, *pud_efi;
246 if (efi_enabled(EFI_OLD_MEMMAP))
250 * We can share all PGD entries apart from the one entry that
251 * covers the EFI runtime mapping space.
253 * Make sure the EFI runtime region mappings are guaranteed to
254 * only span a single PGD entry and that the entry also maps
255 * other important kernel regions.
257 BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END));
258 BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) !=
259 (EFI_VA_END & PGDIR_MASK));
261 pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET);
262 pgd_k = pgd_offset_k(PAGE_OFFSET);
264 num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET);
265 memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries);
268 * As with PGDs, we share all P4D entries apart from the one entry
269 * that covers the EFI runtime mapping space.
271 BUILD_BUG_ON(p4d_index(EFI_VA_END) != p4d_index(MODULES_END));
272 BUILD_BUG_ON((EFI_VA_START & P4D_MASK) != (EFI_VA_END & P4D_MASK));
274 pgd_efi = efi_pgd + pgd_index(EFI_VA_END);
275 pgd_k = pgd_offset_k(EFI_VA_END);
276 p4d_efi = p4d_offset(pgd_efi, 0);
277 p4d_k = p4d_offset(pgd_k, 0);
279 num_entries = p4d_index(EFI_VA_END);
280 memcpy(p4d_efi, p4d_k, sizeof(p4d_t) * num_entries);
283 * We share all the PUD entries apart from those that map the
284 * EFI regions. Copy around them.
286 BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0);
287 BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0);
289 p4d_efi = p4d_offset(pgd_efi, EFI_VA_END);
290 p4d_k = p4d_offset(pgd_k, EFI_VA_END);
291 pud_efi = pud_offset(p4d_efi, 0);
292 pud_k = pud_offset(p4d_k, 0);
294 num_entries = pud_index(EFI_VA_END);
295 memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
297 pud_efi = pud_offset(p4d_efi, EFI_VA_START);
298 pud_k = pud_offset(p4d_k, EFI_VA_START);
300 num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START);
301 memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
305 * Wrapper for slow_virt_to_phys() that handles NULL addresses.
307 static inline phys_addr_t
308 virt_to_phys_or_null_size(void *va, unsigned long size)
315 if (virt_addr_valid(va))
316 return virt_to_phys(va);
319 * A fully aligned variable on the stack is guaranteed not to
320 * cross a page bounary. Try to catch strings on the stack by
321 * checking that 'size' is a power of two.
323 bad_size = size > PAGE_SIZE || !is_power_of_2(size);
325 WARN_ON(!IS_ALIGNED((unsigned long)va, size) || bad_size);
327 return slow_virt_to_phys(va);
330 #define virt_to_phys_or_null(addr) \
331 virt_to_phys_or_null_size((addr), sizeof(*(addr)))
333 int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
335 unsigned long pfn, text, pf;
340 if (efi_enabled(EFI_OLD_MEMMAP))
344 * Since the PGD is encrypted, set the encryption mask so that when
345 * this value is loaded into cr3 the PGD will be decrypted during
346 * the pagetable walk.
348 efi_scratch.efi_pgt = (pgd_t *)__sme_pa(efi_pgd);
352 * It can happen that the physical address of new_memmap lands in memory
353 * which is not mapped in the EFI page table. Therefore we need to go
354 * and ident-map those pages containing the map before calling
355 * phys_efi_set_virtual_address_map().
357 pfn = pa_memmap >> PAGE_SHIFT;
358 pf = _PAGE_NX | _PAGE_RW | _PAGE_ENC;
359 if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, pf)) {
360 pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap);
364 efi_scratch.use_pgd = true;
367 * Certain firmware versions are way too sentimential and still believe
368 * they are exclusive and unquestionable owners of the first physical page,
369 * even though they explicitly mark it as EFI_CONVENTIONAL_MEMORY
370 * (but then write-access it later during SetVirtualAddressMap()).
372 * Create a 1:1 mapping for this page, to avoid triple faults during early
373 * boot with such firmware. We are free to hand this page to the BIOS,
374 * as trim_bios_range() will reserve the first page and isolate it away
375 * from memory allocators anyway.
381 if (kernel_map_pages_in_pgd(pgd, 0x0, 0x0, 1, pf)) {
382 pr_err("Failed to create 1:1 mapping for the first page!\n");
387 * When making calls to the firmware everything needs to be 1:1
388 * mapped and addressable with 32-bit pointers. Map the kernel
389 * text and allocate a new stack because we can't rely on the
390 * stack pointer being < 4GB.
392 if (!IS_ENABLED(CONFIG_EFI_MIXED) || efi_is_native())
395 page = alloc_page(GFP_KERNEL|__GFP_DMA32);
397 panic("Unable to allocate EFI runtime stack < 4GB\n");
399 efi_scratch.phys_stack = virt_to_phys(page_address(page));
400 efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */
402 npages = (_etext - _text) >> PAGE_SHIFT;
404 pfn = text >> PAGE_SHIFT;
406 pf = _PAGE_RW | _PAGE_ENC;
407 if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, pf)) {
408 pr_err("Failed to map kernel text 1:1\n");
415 static void __init __map_region(efi_memory_desc_t *md, u64 va)
417 unsigned long flags = _PAGE_RW;
419 pgd_t *pgd = efi_pgd;
421 if (!(md->attribute & EFI_MEMORY_WB))
427 pfn = md->phys_addr >> PAGE_SHIFT;
428 if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags))
429 pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
433 void __init efi_map_region(efi_memory_desc_t *md)
435 unsigned long size = md->num_pages << PAGE_SHIFT;
436 u64 pa = md->phys_addr;
438 if (efi_enabled(EFI_OLD_MEMMAP))
439 return old_map_region(md);
442 * Make sure the 1:1 mappings are present as a catch-all for b0rked
443 * firmware which doesn't update all internal pointers after switching
444 * to virtual mode and would otherwise crap on us.
446 __map_region(md, md->phys_addr);
449 * Enforce the 1:1 mapping as the default virtual address when
450 * booting in EFI mixed mode, because even though we may be
451 * running a 64-bit kernel, the firmware may only be 32-bit.
453 if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) {
454 md->virt_addr = md->phys_addr;
460 /* Is PA 2M-aligned? */
461 if (!(pa & (PMD_SIZE - 1))) {
464 u64 pa_offset = pa & (PMD_SIZE - 1);
465 u64 prev_va = efi_va;
467 /* get us the same offset within this 2M page */
468 efi_va = (efi_va & PMD_MASK) + pa_offset;
470 if (efi_va > prev_va)
474 if (efi_va < EFI_VA_END) {
475 pr_warn(FW_WARN "VA address range overflow!\n");
480 __map_region(md, efi_va);
481 md->virt_addr = efi_va;
485 * kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges.
486 * md->virt_addr is the original virtual address which had been mapped in kexec
489 void __init efi_map_region_fixed(efi_memory_desc_t *md)
491 __map_region(md, md->phys_addr);
492 __map_region(md, md->virt_addr);
495 void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
496 u32 type, u64 attribute)
498 unsigned long last_map_pfn;
500 if (type == EFI_MEMORY_MAPPED_IO)
501 return ioremap(phys_addr, size);
503 last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
504 if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
505 unsigned long top = last_map_pfn << PAGE_SHIFT;
506 efi_ioremap(top, size - (top - phys_addr), type, attribute);
509 if (!(attribute & EFI_MEMORY_WB))
510 efi_memory_uc((u64)(unsigned long)__va(phys_addr), size);
512 return (void __iomem *)__va(phys_addr);
515 void __init parse_efi_setup(u64 phys_addr, u32 data_len)
517 efi_setup = phys_addr + sizeof(struct setup_data);
520 static int __init efi_update_mappings(efi_memory_desc_t *md, unsigned long pf)
523 pgd_t *pgd = efi_pgd;
526 /* Update the 1:1 mapping */
527 pfn = md->phys_addr >> PAGE_SHIFT;
528 err1 = kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf);
530 pr_err("Error while updating 1:1 mapping PA 0x%llx -> VA 0x%llx!\n",
531 md->phys_addr, md->virt_addr);
534 err2 = kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf);
536 pr_err("Error while updating VA mapping PA 0x%llx -> VA 0x%llx!\n",
537 md->phys_addr, md->virt_addr);
543 static int __init efi_update_mem_attr(struct mm_struct *mm, efi_memory_desc_t *md)
545 unsigned long pf = 0;
547 if (md->attribute & EFI_MEMORY_XP)
550 if (!(md->attribute & EFI_MEMORY_RO))
556 return efi_update_mappings(md, pf);
559 void __init efi_runtime_update_mappings(void)
561 efi_memory_desc_t *md;
563 if (efi_enabled(EFI_OLD_MEMMAP)) {
564 if (__supported_pte_mask & _PAGE_NX)
565 runtime_code_page_mkexec();
570 * Use the EFI Memory Attribute Table for mapping permissions if it
571 * exists, since it is intended to supersede EFI_PROPERTIES_TABLE.
573 if (efi_enabled(EFI_MEM_ATTR)) {
574 efi_memattr_apply_permissions(NULL, efi_update_mem_attr);
579 * EFI_MEMORY_ATTRIBUTES_TABLE is intended to replace
580 * EFI_PROPERTIES_TABLE. So, use EFI_PROPERTIES_TABLE to update
581 * permissions only if EFI_MEMORY_ATTRIBUTES_TABLE is not
582 * published by the firmware. Even if we find a buggy implementation of
583 * EFI_MEMORY_ATTRIBUTES_TABLE, don't fall back to
584 * EFI_PROPERTIES_TABLE, because of the same reason.
587 if (!efi_enabled(EFI_NX_PE_DATA))
590 for_each_efi_memory_desc(md) {
591 unsigned long pf = 0;
593 if (!(md->attribute & EFI_MEMORY_RUNTIME))
596 if (!(md->attribute & EFI_MEMORY_WB))
599 if ((md->attribute & EFI_MEMORY_XP) ||
600 (md->type == EFI_RUNTIME_SERVICES_DATA))
603 if (!(md->attribute & EFI_MEMORY_RO) &&
604 (md->type != EFI_RUNTIME_SERVICES_CODE))
610 efi_update_mappings(md, pf);
614 void __init efi_dump_pagetable(void)
616 #ifdef CONFIG_EFI_PGT_DUMP
617 if (efi_enabled(EFI_OLD_MEMMAP))
618 ptdump_walk_pgd_level(NULL, swapper_pg_dir);
620 ptdump_walk_pgd_level(NULL, efi_pgd);
624 #ifdef CONFIG_EFI_MIXED
625 extern efi_status_t efi64_thunk(u32, ...);
627 #define runtime_service32(func) \
629 u32 table = (u32)(unsigned long)efi.systab; \
632 rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime)); \
633 ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \
638 * Switch to the EFI page tables early so that we can access the 1:1
639 * runtime services mappings which are not mapped in any other page
640 * tables. This function must be called before runtime_service32().
642 * Also, disable interrupts because the IDT points to 64-bit handlers,
643 * which aren't going to function correctly when we switch to 32-bit.
645 #define efi_thunk(f, ...) \
648 unsigned long __flags; \
651 local_irq_save(__flags); \
652 arch_efi_call_virt_setup(); \
654 __func = runtime_service32(f); \
655 __s = efi64_thunk(__func, __VA_ARGS__); \
657 arch_efi_call_virt_teardown(); \
658 local_irq_restore(__flags); \
663 efi_status_t efi_thunk_set_virtual_address_map(
664 void *phys_set_virtual_address_map,
665 unsigned long memory_map_size,
666 unsigned long descriptor_size,
667 u32 descriptor_version,
668 efi_memory_desc_t *virtual_map)
674 efi_sync_low_kernel_mappings();
675 local_irq_save(flags);
677 efi_scratch.prev_cr3 = __read_cr3();
678 write_cr3((unsigned long)efi_scratch.efi_pgt);
681 func = (u32)(unsigned long)phys_set_virtual_address_map;
682 status = efi64_thunk(func, memory_map_size, descriptor_size,
683 descriptor_version, virtual_map);
685 write_cr3(efi_scratch.prev_cr3);
687 local_irq_restore(flags);
692 static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc)
695 u32 phys_tm, phys_tc;
697 spin_lock(&rtc_lock);
699 phys_tm = virt_to_phys_or_null(tm);
700 phys_tc = virt_to_phys_or_null(tc);
702 status = efi_thunk(get_time, phys_tm, phys_tc);
704 spin_unlock(&rtc_lock);
709 static efi_status_t efi_thunk_set_time(efi_time_t *tm)
714 spin_lock(&rtc_lock);
716 phys_tm = virt_to_phys_or_null(tm);
718 status = efi_thunk(set_time, phys_tm);
720 spin_unlock(&rtc_lock);
726 efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
730 u32 phys_enabled, phys_pending, phys_tm;
732 spin_lock(&rtc_lock);
734 phys_enabled = virt_to_phys_or_null(enabled);
735 phys_pending = virt_to_phys_or_null(pending);
736 phys_tm = virt_to_phys_or_null(tm);
738 status = efi_thunk(get_wakeup_time, phys_enabled,
739 phys_pending, phys_tm);
741 spin_unlock(&rtc_lock);
747 efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
752 spin_lock(&rtc_lock);
754 phys_tm = virt_to_phys_or_null(tm);
756 status = efi_thunk(set_wakeup_time, enabled, phys_tm);
758 spin_unlock(&rtc_lock);
763 static unsigned long efi_name_size(efi_char16_t *name)
765 return ucs2_strsize(name, EFI_VAR_NAME_LEN) + 1;
769 efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor,
770 u32 *attr, unsigned long *data_size, void *data)
773 u32 phys_name, phys_vendor, phys_attr;
774 u32 phys_data_size, phys_data;
776 phys_data_size = virt_to_phys_or_null(data_size);
777 phys_vendor = virt_to_phys_or_null(vendor);
778 phys_name = virt_to_phys_or_null_size(name, efi_name_size(name));
779 phys_attr = virt_to_phys_or_null(attr);
780 phys_data = virt_to_phys_or_null_size(data, *data_size);
782 status = efi_thunk(get_variable, phys_name, phys_vendor,
783 phys_attr, phys_data_size, phys_data);
789 efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor,
790 u32 attr, unsigned long data_size, void *data)
792 u32 phys_name, phys_vendor, phys_data;
795 phys_name = virt_to_phys_or_null_size(name, efi_name_size(name));
796 phys_vendor = virt_to_phys_or_null(vendor);
797 phys_data = virt_to_phys_or_null_size(data, data_size);
799 /* If data_size is > sizeof(u32) we've got problems */
800 status = efi_thunk(set_variable, phys_name, phys_vendor,
801 attr, data_size, phys_data);
807 efi_thunk_get_next_variable(unsigned long *name_size,
812 u32 phys_name_size, phys_name, phys_vendor;
814 phys_name_size = virt_to_phys_or_null(name_size);
815 phys_vendor = virt_to_phys_or_null(vendor);
816 phys_name = virt_to_phys_or_null_size(name, *name_size);
818 status = efi_thunk(get_next_variable, phys_name_size,
819 phys_name, phys_vendor);
825 efi_thunk_get_next_high_mono_count(u32 *count)
830 phys_count = virt_to_phys_or_null(count);
831 status = efi_thunk(get_next_high_mono_count, phys_count);
837 efi_thunk_reset_system(int reset_type, efi_status_t status,
838 unsigned long data_size, efi_char16_t *data)
842 phys_data = virt_to_phys_or_null_size(data, data_size);
844 efi_thunk(reset_system, reset_type, status, data_size, phys_data);
848 efi_thunk_update_capsule(efi_capsule_header_t **capsules,
849 unsigned long count, unsigned long sg_list)
852 * To properly support this function we would need to repackage
853 * 'capsules' because the firmware doesn't understand 64-bit
856 return EFI_UNSUPPORTED;
860 efi_thunk_query_variable_info(u32 attr, u64 *storage_space,
861 u64 *remaining_space,
862 u64 *max_variable_size)
865 u32 phys_storage, phys_remaining, phys_max;
867 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
868 return EFI_UNSUPPORTED;
870 phys_storage = virt_to_phys_or_null(storage_space);
871 phys_remaining = virt_to_phys_or_null(remaining_space);
872 phys_max = virt_to_phys_or_null(max_variable_size);
874 status = efi_thunk(query_variable_info, attr, phys_storage,
875 phys_remaining, phys_max);
881 efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules,
882 unsigned long count, u64 *max_size,
886 * To properly support this function we would need to repackage
887 * 'capsules' because the firmware doesn't understand 64-bit
890 return EFI_UNSUPPORTED;
893 void efi_thunk_runtime_setup(void)
895 efi.get_time = efi_thunk_get_time;
896 efi.set_time = efi_thunk_set_time;
897 efi.get_wakeup_time = efi_thunk_get_wakeup_time;
898 efi.set_wakeup_time = efi_thunk_set_wakeup_time;
899 efi.get_variable = efi_thunk_get_variable;
900 efi.get_next_variable = efi_thunk_get_next_variable;
901 efi.set_variable = efi_thunk_set_variable;
902 efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count;
903 efi.reset_system = efi_thunk_reset_system;
904 efi.query_variable_info = efi_thunk_query_variable_info;
905 efi.update_capsule = efi_thunk_update_capsule;
906 efi.query_capsule_caps = efi_thunk_query_capsule_caps;
908 #endif /* CONFIG_EFI_MIXED */