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
);
138 pgd_offset_k(pgd
* PGDIR_SIZE
)->pgd
&= ~_PAGE_NX
;
147 void __init
efi_call_phys_epilog(pgd_t
*save_pgd
)
150 * After the lock is released, the original page table is restored.
158 if (!efi_enabled(EFI_OLD_MEMMAP
)) {
159 write_cr3((unsigned long)save_pgd
);
164 nr_pgds
= DIV_ROUND_UP((max_pfn
<< PAGE_SHIFT
) , PGDIR_SIZE
);
166 for (pgd_idx
= 0; pgd_idx
< nr_pgds
; pgd_idx
++) {
167 pgd
= pgd_offset_k(pgd_idx
* PGDIR_SIZE
);
168 set_pgd(pgd_offset_k(pgd_idx
* PGDIR_SIZE
), save_pgd
[pgd_idx
]);
170 if (!(pgd_val(*pgd
) & _PAGE_PRESENT
))
173 for (i
= 0; i
< PTRS_PER_P4D
; i
++) {
174 p4d
= p4d_offset(pgd
,
175 pgd_idx
* PGDIR_SIZE
+ i
* P4D_SIZE
);
177 if (!(p4d_val(*p4d
) & _PAGE_PRESENT
))
180 pud
= (pud_t
*)p4d_page_vaddr(*p4d
);
181 pud_free(&init_mm
, pud
);
184 p4d
= (p4d_t
*)pgd_page_vaddr(*pgd
);
185 p4d_free(&init_mm
, p4d
);
191 early_code_mapping_set_exec(0);
194 static pgd_t
*efi_pgd
;
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().
202 * We don't want the pgd on the pgd_list and cannot use pgd_alloc() for the
205 int __init
efi_alloc_page_tables(void)
212 if (efi_enabled(EFI_OLD_MEMMAP
))
215 gfp_mask
= GFP_KERNEL
| __GFP_ZERO
;
216 efi_pgd
= (pgd_t
*)__get_free_pages(gfp_mask
, PGD_ALLOCATION_ORDER
);
220 pgd
= efi_pgd
+ pgd_index(EFI_VA_END
);
221 p4d
= p4d_alloc(&init_mm
, pgd
, EFI_VA_END
);
223 free_page((unsigned long)efi_pgd
);
227 pud
= pud_alloc(&init_mm
, p4d
, EFI_VA_END
);
229 if (CONFIG_PGTABLE_LEVELS
> 4)
230 free_page((unsigned long) pgd_page_vaddr(*pgd
));
231 free_page((unsigned long)efi_pgd
);
239 * Add low kernel mappings for passing arguments to EFI functions.
241 void efi_sync_low_kernel_mappings(void)
243 unsigned num_entries
;
244 pgd_t
*pgd_k
, *pgd_efi
;
245 p4d_t
*p4d_k
, *p4d_efi
;
246 pud_t
*pud_k
, *pud_efi
;
248 if (efi_enabled(EFI_OLD_MEMMAP
))
252 * We can share all PGD entries apart from the one entry that
253 * covers the EFI runtime mapping space.
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.
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
));
263 pgd_efi
= efi_pgd
+ pgd_index(PAGE_OFFSET
);
264 pgd_k
= pgd_offset_k(PAGE_OFFSET
);
266 num_entries
= pgd_index(EFI_VA_END
) - pgd_index(PAGE_OFFSET
);
267 memcpy(pgd_efi
, pgd_k
, sizeof(pgd_t
) * num_entries
);
270 * As with PGDs, we share all P4D entries apart from the one entry
271 * that covers the EFI runtime mapping space.
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
));
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);
281 num_entries
= p4d_index(EFI_VA_END
);
282 memcpy(p4d_efi
, p4d_k
, sizeof(p4d_t
) * num_entries
);
285 * We share all the PUD entries apart from those that map the
286 * EFI regions. Copy around them.
288 BUILD_BUG_ON((EFI_VA_START
& ~PUD_MASK
) != 0);
289 BUILD_BUG_ON((EFI_VA_END
& ~PUD_MASK
) != 0);
291 p4d_efi
= p4d_offset(pgd_efi
, EFI_VA_END
);
292 p4d_k
= p4d_offset(pgd_k
, EFI_VA_END
);
293 pud_efi
= pud_offset(p4d_efi
, 0);
294 pud_k
= pud_offset(p4d_k
, 0);
296 num_entries
= pud_index(EFI_VA_END
);
297 memcpy(pud_efi
, pud_k
, sizeof(pud_t
) * num_entries
);
299 pud_efi
= pud_offset(p4d_efi
, EFI_VA_START
);
300 pud_k
= pud_offset(p4d_k
, EFI_VA_START
);
302 num_entries
= PTRS_PER_PUD
- pud_index(EFI_VA_START
);
303 memcpy(pud_efi
, pud_k
, sizeof(pud_t
) * num_entries
);
307 * Wrapper for slow_virt_to_phys() that handles NULL addresses.
309 static inline phys_addr_t
310 virt_to_phys_or_null_size(void *va
, unsigned long size
)
317 if (virt_addr_valid(va
))
318 return virt_to_phys(va
);
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.
325 bad_size
= size
> PAGE_SIZE
|| !is_power_of_2(size
);
327 WARN_ON(!IS_ALIGNED((unsigned long)va
, size
) || bad_size
);
329 return slow_virt_to_phys(va
);
332 #define virt_to_phys_or_null(addr) \
333 virt_to_phys_or_null_size((addr), sizeof(*(addr)))
335 int __init
efi_setup_page_tables(unsigned long pa_memmap
, unsigned num_pages
)
337 unsigned long pfn
, text
, pf
;
342 if (efi_enabled(EFI_OLD_MEMMAP
))
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.
350 efi_scratch
.efi_pgt
= (pgd_t
*)__sme_pa(efi_pgd
);
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().
359 pfn
= pa_memmap
>> PAGE_SHIFT
;
360 pf
= _PAGE_NX
| _PAGE_RW
| _PAGE_ENC
;
361 if (kernel_map_pages_in_pgd(pgd
, pfn
, pa_memmap
, num_pages
, pf
)) {
362 pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap
);
366 efi_scratch
.use_pgd
= true;
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()).
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.
383 if (kernel_map_pages_in_pgd(pgd
, 0x0, 0x0, 1, pf
)) {
384 pr_err("Failed to create 1:1 mapping for the first page!\n");
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.
394 if (!IS_ENABLED(CONFIG_EFI_MIXED
) || efi_is_native())
397 page
= alloc_page(GFP_KERNEL
|__GFP_DMA32
);
399 panic("Unable to allocate EFI runtime stack < 4GB\n");
401 efi_scratch
.phys_stack
= virt_to_phys(page_address(page
));
402 efi_scratch
.phys_stack
+= PAGE_SIZE
; /* stack grows down */
404 npages
= (_etext
- _text
) >> PAGE_SHIFT
;
406 pfn
= text
>> PAGE_SHIFT
;
408 pf
= _PAGE_RW
| _PAGE_ENC
;
409 if (kernel_map_pages_in_pgd(pgd
, pfn
, text
, npages
, pf
)) {
410 pr_err("Failed to map kernel text 1:1\n");
417 static void __init
__map_region(efi_memory_desc_t
*md
, u64 va
)
419 unsigned long flags
= _PAGE_RW
;
421 pgd_t
*pgd
= efi_pgd
;
423 if (!(md
->attribute
& EFI_MEMORY_WB
))
429 pfn
= md
->phys_addr
>> PAGE_SHIFT
;
430 if (kernel_map_pages_in_pgd(pgd
, pfn
, va
, md
->num_pages
, flags
))
431 pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
435 void __init
efi_map_region(efi_memory_desc_t
*md
)
437 unsigned long size
= md
->num_pages
<< PAGE_SHIFT
;
438 u64 pa
= md
->phys_addr
;
440 if (efi_enabled(EFI_OLD_MEMMAP
))
441 return old_map_region(md
);
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.
448 __map_region(md
, md
->phys_addr
);
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.
455 if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED
)) {
456 md
->virt_addr
= md
->phys_addr
;
462 /* Is PA 2M-aligned? */
463 if (!(pa
& (PMD_SIZE
- 1))) {
466 u64 pa_offset
= pa
& (PMD_SIZE
- 1);
467 u64 prev_va
= efi_va
;
469 /* get us the same offset within this 2M page */
470 efi_va
= (efi_va
& PMD_MASK
) + pa_offset
;
472 if (efi_va
> prev_va
)
476 if (efi_va
< EFI_VA_END
) {
477 pr_warn(FW_WARN
"VA address range overflow!\n");
482 __map_region(md
, efi_va
);
483 md
->virt_addr
= efi_va
;
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
491 void __init
efi_map_region_fixed(efi_memory_desc_t
*md
)
493 __map_region(md
, md
->phys_addr
);
494 __map_region(md
, md
->virt_addr
);
497 void __iomem
*__init
efi_ioremap(unsigned long phys_addr
, unsigned long size
,
498 u32 type
, u64 attribute
)
500 unsigned long last_map_pfn
;
502 if (type
== EFI_MEMORY_MAPPED_IO
)
503 return ioremap(phys_addr
, size
);
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
;
508 efi_ioremap(top
, size
- (top
- phys_addr
), type
, attribute
);
511 if (!(attribute
& EFI_MEMORY_WB
))
512 efi_memory_uc((u64
)(unsigned long)__va(phys_addr
), size
);
514 return (void __iomem
*)__va(phys_addr
);
517 void __init
parse_efi_setup(u64 phys_addr
, u32 data_len
)
519 efi_setup
= phys_addr
+ sizeof(struct setup_data
);
522 static int __init
efi_update_mappings(efi_memory_desc_t
*md
, unsigned long pf
)
525 pgd_t
*pgd
= efi_pgd
;
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
);
532 pr_err("Error while updating 1:1 mapping PA 0x%llx -> VA 0x%llx!\n",
533 md
->phys_addr
, md
->virt_addr
);
536 err2
= kernel_map_pages_in_pgd(pgd
, pfn
, md
->virt_addr
, md
->num_pages
, pf
);
538 pr_err("Error while updating VA mapping PA 0x%llx -> VA 0x%llx!\n",
539 md
->phys_addr
, md
->virt_addr
);
545 static int __init
efi_update_mem_attr(struct mm_struct
*mm
, efi_memory_desc_t
*md
)
547 unsigned long pf
= 0;
549 if (md
->attribute
& EFI_MEMORY_XP
)
552 if (!(md
->attribute
& EFI_MEMORY_RO
))
558 return efi_update_mappings(md
, pf
);
561 void __init
efi_runtime_update_mappings(void)
563 efi_memory_desc_t
*md
;
565 if (efi_enabled(EFI_OLD_MEMMAP
)) {
566 if (__supported_pte_mask
& _PAGE_NX
)
567 runtime_code_page_mkexec();
572 * Use the EFI Memory Attribute Table for mapping permissions if it
573 * exists, since it is intended to supersede EFI_PROPERTIES_TABLE.
575 if (efi_enabled(EFI_MEM_ATTR
)) {
576 efi_memattr_apply_permissions(NULL
, efi_update_mem_attr
);
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.
589 if (!efi_enabled(EFI_NX_PE_DATA
))
592 for_each_efi_memory_desc(md
) {
593 unsigned long pf
= 0;
595 if (!(md
->attribute
& EFI_MEMORY_RUNTIME
))
598 if (!(md
->attribute
& EFI_MEMORY_WB
))
601 if ((md
->attribute
& EFI_MEMORY_XP
) ||
602 (md
->type
== EFI_RUNTIME_SERVICES_DATA
))
605 if (!(md
->attribute
& EFI_MEMORY_RO
) &&
606 (md
->type
!= EFI_RUNTIME_SERVICES_CODE
))
612 efi_update_mappings(md
, pf
);
616 void __init
efi_dump_pagetable(void)
618 #ifdef CONFIG_EFI_PGT_DUMP
619 if (efi_enabled(EFI_OLD_MEMMAP
))
620 ptdump_walk_pgd_level(NULL
, swapper_pg_dir
);
622 ptdump_walk_pgd_level(NULL
, efi_pgd
);
626 #ifdef CONFIG_EFI_MIXED
627 extern efi_status_t
efi64_thunk(u32
, ...);
629 #define runtime_service32(func) \
631 u32 table = (u32)(unsigned long)efi.systab; \
634 rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime)); \
635 ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \
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().
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.
647 #define efi_thunk(f, ...) \
650 unsigned long __flags; \
653 local_irq_save(__flags); \
654 arch_efi_call_virt_setup(); \
656 __func = runtime_service32(f); \
657 __s = efi64_thunk(__func, __VA_ARGS__); \
659 arch_efi_call_virt_teardown(); \
660 local_irq_restore(__flags); \
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
)
676 efi_sync_low_kernel_mappings();
677 local_irq_save(flags
);
679 efi_scratch
.prev_cr3
= __read_cr3();
680 write_cr3((unsigned long)efi_scratch
.efi_pgt
);
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
);
687 write_cr3(efi_scratch
.prev_cr3
);
689 local_irq_restore(flags
);
694 static efi_status_t
efi_thunk_get_time(efi_time_t
*tm
, efi_time_cap_t
*tc
)
697 u32 phys_tm
, phys_tc
;
699 spin_lock(&rtc_lock
);
701 phys_tm
= virt_to_phys_or_null(tm
);
702 phys_tc
= virt_to_phys_or_null(tc
);
704 status
= efi_thunk(get_time
, phys_tm
, phys_tc
);
706 spin_unlock(&rtc_lock
);
711 static efi_status_t
efi_thunk_set_time(efi_time_t
*tm
)
716 spin_lock(&rtc_lock
);
718 phys_tm
= virt_to_phys_or_null(tm
);
720 status
= efi_thunk(set_time
, phys_tm
);
722 spin_unlock(&rtc_lock
);
728 efi_thunk_get_wakeup_time(efi_bool_t
*enabled
, efi_bool_t
*pending
,
732 u32 phys_enabled
, phys_pending
, phys_tm
;
734 spin_lock(&rtc_lock
);
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
);
740 status
= efi_thunk(get_wakeup_time
, phys_enabled
,
741 phys_pending
, phys_tm
);
743 spin_unlock(&rtc_lock
);
749 efi_thunk_set_wakeup_time(efi_bool_t enabled
, efi_time_t
*tm
)
754 spin_lock(&rtc_lock
);
756 phys_tm
= virt_to_phys_or_null(tm
);
758 status
= efi_thunk(set_wakeup_time
, enabled
, phys_tm
);
760 spin_unlock(&rtc_lock
);
765 static unsigned long efi_name_size(efi_char16_t
*name
)
767 return ucs2_strsize(name
, EFI_VAR_NAME_LEN
) + 1;
771 efi_thunk_get_variable(efi_char16_t
*name
, efi_guid_t
*vendor
,
772 u32
*attr
, unsigned long *data_size
, void *data
)
775 u32 phys_name
, phys_vendor
, phys_attr
;
776 u32 phys_data_size
, phys_data
;
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
);
784 status
= efi_thunk(get_variable
, phys_name
, phys_vendor
,
785 phys_attr
, phys_data_size
, phys_data
);
791 efi_thunk_set_variable(efi_char16_t
*name
, efi_guid_t
*vendor
,
792 u32 attr
, unsigned long data_size
, void *data
)
794 u32 phys_name
, phys_vendor
, phys_data
;
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
);
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
);
809 efi_thunk_get_next_variable(unsigned long *name_size
,
814 u32 phys_name_size
, phys_name
, phys_vendor
;
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
);
820 status
= efi_thunk(get_next_variable
, phys_name_size
,
821 phys_name
, phys_vendor
);
827 efi_thunk_get_next_high_mono_count(u32
*count
)
832 phys_count
= virt_to_phys_or_null(count
);
833 status
= efi_thunk(get_next_high_mono_count
, phys_count
);
839 efi_thunk_reset_system(int reset_type
, efi_status_t status
,
840 unsigned long data_size
, efi_char16_t
*data
)
844 phys_data
= virt_to_phys_or_null_size(data
, data_size
);
846 efi_thunk(reset_system
, reset_type
, status
, data_size
, phys_data
);
850 efi_thunk_update_capsule(efi_capsule_header_t
**capsules
,
851 unsigned long count
, unsigned long sg_list
)
854 * To properly support this function we would need to repackage
855 * 'capsules' because the firmware doesn't understand 64-bit
858 return EFI_UNSUPPORTED
;
862 efi_thunk_query_variable_info(u32 attr
, u64
*storage_space
,
863 u64
*remaining_space
,
864 u64
*max_variable_size
)
867 u32 phys_storage
, phys_remaining
, phys_max
;
869 if (efi
.runtime_version
< EFI_2_00_SYSTEM_TABLE_REVISION
)
870 return EFI_UNSUPPORTED
;
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
);
876 status
= efi_thunk(query_variable_info
, attr
, phys_storage
,
877 phys_remaining
, phys_max
);
883 efi_thunk_query_capsule_caps(efi_capsule_header_t
**capsules
,
884 unsigned long count
, u64
*max_size
,
888 * To properly support this function we would need to repackage
889 * 'capsules' because the firmware doesn't understand 64-bit
892 return EFI_UNSUPPORTED
;
895 void efi_thunk_runtime_setup(void)
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
;
910 #endif /* CONFIG_EFI_MIXED */