1 // SPDX-License-Identifier: GPL-2.0
3 * Common EFI (Extensible Firmware Interface) support functions
4 * Based on Extensible Firmware Interface Specification version 1.0
6 * Copyright (C) 1999 VA Linux Systems
7 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
8 * Copyright (C) 1999-2002 Hewlett-Packard Co.
9 * David Mosberger-Tang <davidm@hpl.hp.com>
10 * Stephane Eranian <eranian@hpl.hp.com>
11 * Copyright (C) 2005-2008 Intel Co.
12 * Fenghua Yu <fenghua.yu@intel.com>
13 * Bibo Mao <bibo.mao@intel.com>
14 * Chandramouli Narayanan <mouli@linux.intel.com>
15 * Huang Ying <ying.huang@intel.com>
16 * Copyright (C) 2013 SuSE Labs
17 * Borislav Petkov <bp@suse.de> - runtime services VA mapping
19 * Copied from efi_32.c to eliminate the duplicated code between EFI
20 * 32/64 support code. --ying 2007-10-26
22 * All EFI Runtime Services are not implemented yet as EFI only
23 * supports physical mode addressing on SoftSDV. This is to be fixed
24 * in a future version. --drummond 1999-07-20
26 * Implemented EFI runtime services and virtual mode calls. --davidm
28 * Goutham Rao: <goutham.rao@intel.com>
29 * Skip non-WB memory and ignore empty memory ranges.
32 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
34 #include <linux/kernel.h>
35 #include <linux/init.h>
36 #include <linux/efi.h>
37 #include <linux/efi-bgrt.h>
38 #include <linux/export.h>
39 #include <linux/memblock.h>
40 #include <linux/slab.h>
41 #include <linux/spinlock.h>
42 #include <linux/uaccess.h>
43 #include <linux/time.h>
45 #include <linux/reboot.h>
46 #include <linux/bcd.h>
48 #include <asm/setup.h>
50 #include <asm/e820/api.h>
52 #include <asm/set_memory.h>
53 #include <asm/tlbflush.h>
54 #include <asm/x86_init.h>
55 #include <asm/uv/uv.h>
57 static unsigned long efi_systab_phys __initdata;
58 static unsigned long prop_phys = EFI_INVALID_TABLE_ADDR;
59 static unsigned long uga_phys = EFI_INVALID_TABLE_ADDR;
60 static unsigned long efi_runtime, efi_nr_tables;
62 unsigned long efi_fw_vendor, efi_config_table;
64 static const efi_config_table_type_t arch_tables[] __initconst = {
65 {EFI_PROPERTIES_TABLE_GUID, &prop_phys, "PROP" },
66 {UGA_IO_PROTOCOL_GUID, &uga_phys, "UGA" },
68 {UV_SYSTEM_TABLE_GUID, &uv_systab_phys, "UVsystab" },
73 static const unsigned long * const efi_tables[] = {
88 #ifdef CONFIG_EFI_RCI2_TABLE
96 u64 efi_setup; /* efi setup_data physical address */
98 static int add_efi_memmap __initdata;
99 static int __init setup_add_efi_memmap(char *arg)
104 early_param("add_efi_memmap", setup_add_efi_memmap);
106 void __init efi_find_mirror(void)
108 efi_memory_desc_t *md;
109 u64 mirror_size = 0, total_size = 0;
111 if (!efi_enabled(EFI_MEMMAP))
114 for_each_efi_memory_desc(md) {
115 unsigned long long start = md->phys_addr;
116 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
119 if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
120 memblock_mark_mirror(start, size);
125 pr_info("Memory: %lldM/%lldM mirrored memory\n",
126 mirror_size>>20, total_size>>20);
130 * Tell the kernel about the EFI memory map. This might include
131 * more than the max 128 entries that can fit in the passed in e820
132 * legacy (zeropage) memory map, but the kernel's e820 table can hold
136 static void __init do_add_efi_memmap(void)
138 efi_memory_desc_t *md;
140 if (!efi_enabled(EFI_MEMMAP))
143 for_each_efi_memory_desc(md) {
144 unsigned long long start = md->phys_addr;
145 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
149 case EFI_LOADER_CODE:
150 case EFI_LOADER_DATA:
151 case EFI_BOOT_SERVICES_CODE:
152 case EFI_BOOT_SERVICES_DATA:
153 case EFI_CONVENTIONAL_MEMORY:
154 if (efi_soft_reserve_enabled()
155 && (md->attribute & EFI_MEMORY_SP))
156 e820_type = E820_TYPE_SOFT_RESERVED;
157 else if (md->attribute & EFI_MEMORY_WB)
158 e820_type = E820_TYPE_RAM;
160 e820_type = E820_TYPE_RESERVED;
162 case EFI_ACPI_RECLAIM_MEMORY:
163 e820_type = E820_TYPE_ACPI;
165 case EFI_ACPI_MEMORY_NVS:
166 e820_type = E820_TYPE_NVS;
168 case EFI_UNUSABLE_MEMORY:
169 e820_type = E820_TYPE_UNUSABLE;
171 case EFI_PERSISTENT_MEMORY:
172 e820_type = E820_TYPE_PMEM;
176 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
177 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
178 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
180 e820_type = E820_TYPE_RESERVED;
184 e820__range_add(start, size, e820_type);
186 e820__update_table(e820_table);
190 * Given add_efi_memmap defaults to 0 and there there is no alternative
191 * e820 mechanism for soft-reserved memory, import the full EFI memory
192 * map if soft reservations are present and enabled. Otherwise, the
193 * mechanism to disable the kernel's consideration of EFI_MEMORY_SP is
194 * the efi=nosoftreserve option.
196 static bool do_efi_soft_reserve(void)
198 efi_memory_desc_t *md;
200 if (!efi_enabled(EFI_MEMMAP))
203 if (!efi_soft_reserve_enabled())
206 for_each_efi_memory_desc(md)
207 if (md->type == EFI_CONVENTIONAL_MEMORY &&
208 (md->attribute & EFI_MEMORY_SP))
213 int __init efi_memblock_x86_reserve_range(void)
215 struct efi_info *e = &boot_params.efi_info;
216 struct efi_memory_map_data data;
220 if (efi_enabled(EFI_PARAVIRT))
223 /* Can't handle firmware tables above 4GB on i386 */
224 if (IS_ENABLED(CONFIG_X86_32) && e->efi_memmap_hi > 0) {
225 pr_err("Memory map is above 4GB, disabling EFI.\n");
228 pmap = (phys_addr_t)(e->efi_memmap | ((u64)e->efi_memmap_hi << 32));
230 data.phys_map = pmap;
231 data.size = e->efi_memmap_size;
232 data.desc_size = e->efi_memdesc_size;
233 data.desc_version = e->efi_memdesc_version;
235 rv = efi_memmap_init_early(&data);
239 if (add_efi_memmap || do_efi_soft_reserve())
242 efi_fake_memmap_early();
244 WARN(efi.memmap.desc_version != 1,
245 "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
246 efi.memmap.desc_version);
248 memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size);
249 set_bit(EFI_PRESERVE_BS_REGIONS, &efi.flags);
254 #define OVERFLOW_ADDR_SHIFT (64 - EFI_PAGE_SHIFT)
255 #define OVERFLOW_ADDR_MASK (U64_MAX << OVERFLOW_ADDR_SHIFT)
256 #define U64_HIGH_BIT (~(U64_MAX >> 1))
258 static bool __init efi_memmap_entry_valid(const efi_memory_desc_t *md, int i)
260 u64 end = (md->num_pages << EFI_PAGE_SHIFT) + md->phys_addr - 1;
264 if (md->num_pages == 0) {
266 } else if (md->num_pages > EFI_PAGES_MAX ||
267 EFI_PAGES_MAX - md->num_pages <
268 (md->phys_addr >> EFI_PAGE_SHIFT)) {
269 end_hi = (md->num_pages & OVERFLOW_ADDR_MASK)
270 >> OVERFLOW_ADDR_SHIFT;
272 if ((md->phys_addr & U64_HIGH_BIT) && !(end & U64_HIGH_BIT))
278 pr_warn_once(FW_BUG "Invalid EFI memory map entries:\n");
281 pr_warn("mem%02u: %s range=[0x%016llx-0x%llx%016llx] (invalid)\n",
282 i, efi_md_typeattr_format(buf, sizeof(buf), md),
283 md->phys_addr, end_hi, end);
285 pr_warn("mem%02u: %s range=[0x%016llx-0x%016llx] (invalid)\n",
286 i, efi_md_typeattr_format(buf, sizeof(buf), md),
292 static void __init efi_clean_memmap(void)
294 efi_memory_desc_t *out = efi.memmap.map;
295 const efi_memory_desc_t *in = out;
296 const efi_memory_desc_t *end = efi.memmap.map_end;
299 for (i = n_removal = 0; in < end; i++) {
300 if (efi_memmap_entry_valid(in, i)) {
302 memcpy(out, in, efi.memmap.desc_size);
303 out = (void *)out + efi.memmap.desc_size;
307 in = (void *)in + efi.memmap.desc_size;
311 struct efi_memory_map_data data = {
312 .phys_map = efi.memmap.phys_map,
313 .desc_version = efi.memmap.desc_version,
314 .desc_size = efi.memmap.desc_size,
315 .size = efi.memmap.desc_size * (efi.memmap.nr_map - n_removal),
319 pr_warn("Removing %d invalid memory map entries.\n", n_removal);
320 efi_memmap_install(&data);
324 void __init efi_print_memmap(void)
326 efi_memory_desc_t *md;
329 for_each_efi_memory_desc(md) {
332 pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n",
333 i++, efi_md_typeattr_format(buf, sizeof(buf), md),
335 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1,
336 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
340 static int __init efi_systab_init(unsigned long phys)
342 int size = efi_enabled(EFI_64BIT) ? sizeof(efi_system_table_64_t)
343 : sizeof(efi_system_table_32_t);
344 const efi_table_hdr_t *hdr;
349 hdr = p = early_memremap_ro(phys, size);
351 pr_err("Couldn't map the system table!\n");
355 ret = efi_systab_check_header(hdr, 1);
357 early_memunmap(p, size);
361 if (efi_enabled(EFI_64BIT)) {
362 const efi_system_table_64_t *systab64 = p;
364 efi_runtime = systab64->runtime;
365 over4g = systab64->runtime > U32_MAX;
368 struct efi_setup_data *data;
370 data = early_memremap_ro(efi_setup, sizeof(*data));
372 early_memunmap(p, size);
376 efi_fw_vendor = (unsigned long)data->fw_vendor;
377 efi_config_table = (unsigned long)data->tables;
379 over4g |= data->fw_vendor > U32_MAX ||
380 data->tables > U32_MAX;
382 early_memunmap(data, sizeof(*data));
384 efi_fw_vendor = systab64->fw_vendor;
385 efi_config_table = systab64->tables;
387 over4g |= systab64->fw_vendor > U32_MAX ||
388 systab64->tables > U32_MAX;
390 efi_nr_tables = systab64->nr_tables;
392 const efi_system_table_32_t *systab32 = p;
394 efi_fw_vendor = systab32->fw_vendor;
395 efi_runtime = systab32->runtime;
396 efi_config_table = systab32->tables;
397 efi_nr_tables = systab32->nr_tables;
400 efi.runtime_version = hdr->revision;
402 efi_systab_report_header(hdr, efi_fw_vendor);
403 early_memunmap(p, size);
405 if (IS_ENABLED(CONFIG_X86_32) && over4g) {
406 pr_err("EFI data located above 4GB, disabling EFI.\n");
413 static int __init efi_config_init(const efi_config_table_type_t *arch_tables)
418 if (efi_nr_tables == 0)
421 if (efi_enabled(EFI_64BIT))
422 sz = sizeof(efi_config_table_64_t);
424 sz = sizeof(efi_config_table_32_t);
427 * Let's see what config tables the firmware passed to us.
429 config_tables = early_memremap(efi_config_table, efi_nr_tables * sz);
430 if (config_tables == NULL) {
431 pr_err("Could not map Configuration table!\n");
435 ret = efi_config_parse_tables(config_tables, efi_nr_tables,
438 early_memunmap(config_tables, efi_nr_tables * sz);
442 void __init efi_init(void)
444 if (IS_ENABLED(CONFIG_X86_32) &&
445 (boot_params.efi_info.efi_systab_hi ||
446 boot_params.efi_info.efi_memmap_hi)) {
447 pr_info("Table located above 4GB, disabling EFI.\n");
451 efi_systab_phys = boot_params.efi_info.efi_systab |
452 ((__u64)boot_params.efi_info.efi_systab_hi << 32);
454 if (efi_systab_init(efi_systab_phys))
457 if (efi_reuse_config(efi_config_table, efi_nr_tables))
460 if (efi_config_init(arch_tables))
464 * Note: We currently don't support runtime services on an EFI
465 * that doesn't match the kernel 32/64-bit mode.
468 if (!efi_runtime_supported())
469 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
471 if (!efi_runtime_supported() || efi_runtime_disabled()) {
476 /* Parse the EFI Properties table if it exists */
477 if (prop_phys != EFI_INVALID_TABLE_ADDR) {
478 efi_properties_table_t *tbl;
480 tbl = early_memremap_ro(prop_phys, sizeof(*tbl));
482 pr_err("Could not map Properties table!\n");
484 if (tbl->memory_protection_attribute &
485 EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
486 set_bit(EFI_NX_PE_DATA, &efi.flags);
488 early_memunmap(tbl, sizeof(*tbl));
492 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
495 if (efi_enabled(EFI_DBG))
499 #if defined(CONFIG_X86_32)
501 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
505 addr = md->virt_addr;
506 npages = md->num_pages;
508 memrange_efi_to_native(&addr, &npages);
511 set_memory_x(addr, npages);
513 set_memory_nx(addr, npages);
516 void __init runtime_code_page_mkexec(void)
518 efi_memory_desc_t *md;
520 /* Make EFI runtime service code area executable */
521 for_each_efi_memory_desc(md) {
522 if (md->type != EFI_RUNTIME_SERVICES_CODE)
525 efi_set_executable(md, true);
529 void __init efi_memory_uc(u64 addr, unsigned long size)
531 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
534 npages = round_up(size, page_shift) / page_shift;
535 memrange_efi_to_native(&addr, &npages);
536 set_memory_uc(addr, npages);
539 void __init old_map_region(efi_memory_desc_t *md)
541 u64 start_pfn, end_pfn, end;
545 start_pfn = PFN_DOWN(md->phys_addr);
546 size = md->num_pages << PAGE_SHIFT;
547 end = md->phys_addr + size;
548 end_pfn = PFN_UP(end);
550 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
551 va = __va(md->phys_addr);
553 if (!(md->attribute & EFI_MEMORY_WB))
554 efi_memory_uc((u64)(unsigned long)va, size);
556 va = efi_ioremap(md->phys_addr, size,
557 md->type, md->attribute);
559 md->virt_addr = (u64) (unsigned long) va;
561 pr_err("ioremap of 0x%llX failed!\n",
562 (unsigned long long)md->phys_addr);
567 /* Merge contiguous regions of the same type and attribute */
568 static void __init efi_merge_regions(void)
570 efi_memory_desc_t *md, *prev_md = NULL;
572 for_each_efi_memory_desc(md) {
580 if (prev_md->type != md->type ||
581 prev_md->attribute != md->attribute) {
586 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
588 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
589 prev_md->num_pages += md->num_pages;
590 md->type = EFI_RESERVED_TYPE;
598 static void *realloc_pages(void *old_memmap, int old_shift)
602 ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
607 * A first-time allocation doesn't have anything to copy.
612 memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
615 free_pages((unsigned long)old_memmap, old_shift);
620 * Iterate the EFI memory map in reverse order because the regions
621 * will be mapped top-down. The end result is the same as if we had
622 * mapped things forward, but doesn't require us to change the
623 * existing implementation of efi_map_region().
625 static inline void *efi_map_next_entry_reverse(void *entry)
629 return efi.memmap.map_end - efi.memmap.desc_size;
631 entry -= efi.memmap.desc_size;
632 if (entry < efi.memmap.map)
639 * efi_map_next_entry - Return the next EFI memory map descriptor
640 * @entry: Previous EFI memory map descriptor
642 * This is a helper function to iterate over the EFI memory map, which
643 * we do in different orders depending on the current configuration.
645 * To begin traversing the memory map @entry must be %NULL.
647 * Returns %NULL when we reach the end of the memory map.
649 static void *efi_map_next_entry(void *entry)
651 if (efi_enabled(EFI_64BIT)) {
653 * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE
654 * config table feature requires us to map all entries
655 * in the same order as they appear in the EFI memory
656 * map. That is to say, entry N must have a lower
657 * virtual address than entry N+1. This is because the
658 * firmware toolchain leaves relative references in
659 * the code/data sections, which are split and become
660 * separate EFI memory regions. Mapping things
661 * out-of-order leads to the firmware accessing
662 * unmapped addresses.
664 * Since we need to map things this way whether or not
665 * the kernel actually makes use of
666 * EFI_PROPERTIES_TABLE, let's just switch to this
667 * scheme by default for 64-bit.
669 return efi_map_next_entry_reverse(entry);
674 return efi.memmap.map;
676 entry += efi.memmap.desc_size;
677 if (entry >= efi.memmap.map_end)
683 static bool should_map_region(efi_memory_desc_t *md)
686 * Runtime regions always require runtime mappings (obviously).
688 if (md->attribute & EFI_MEMORY_RUNTIME)
692 * 32-bit EFI doesn't suffer from the bug that requires us to
693 * reserve boot services regions, and mixed mode support
694 * doesn't exist for 32-bit kernels.
696 if (IS_ENABLED(CONFIG_X86_32))
700 * EFI specific purpose memory may be reserved by default
701 * depending on kernel config and boot options.
703 if (md->type == EFI_CONVENTIONAL_MEMORY &&
704 efi_soft_reserve_enabled() &&
705 (md->attribute & EFI_MEMORY_SP))
709 * Map all of RAM so that we can access arguments in the 1:1
710 * mapping when making EFI runtime calls.
712 if (efi_is_mixed()) {
713 if (md->type == EFI_CONVENTIONAL_MEMORY ||
714 md->type == EFI_LOADER_DATA ||
715 md->type == EFI_LOADER_CODE)
720 * Map boot services regions as a workaround for buggy
721 * firmware that accesses them even when they shouldn't.
723 * See efi_{reserve,free}_boot_services().
725 if (md->type == EFI_BOOT_SERVICES_CODE ||
726 md->type == EFI_BOOT_SERVICES_DATA)
733 * Map the efi memory ranges of the runtime services and update new_mmap with
736 static void * __init efi_map_regions(int *count, int *pg_shift)
738 void *p, *new_memmap = NULL;
739 unsigned long left = 0;
740 unsigned long desc_size;
741 efi_memory_desc_t *md;
743 desc_size = efi.memmap.desc_size;
746 while ((p = efi_map_next_entry(p))) {
749 if (!should_map_region(md))
754 if (left < desc_size) {
755 new_memmap = realloc_pages(new_memmap, *pg_shift);
759 left += PAGE_SIZE << *pg_shift;
763 memcpy(new_memmap + (*count * desc_size), md, desc_size);
772 static void __init kexec_enter_virtual_mode(void)
774 #ifdef CONFIG_KEXEC_CORE
775 efi_memory_desc_t *md;
776 unsigned int num_pages;
779 * We don't do virtual mode, since we don't do runtime services, on
782 if (efi_is_mixed()) {
784 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
788 if (efi_alloc_page_tables()) {
789 pr_err("Failed to allocate EFI page tables\n");
790 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
795 * Map efi regions which were passed via setup_data. The virt_addr is a
796 * fixed addr which was used in first kernel of a kexec boot.
798 for_each_efi_memory_desc(md)
799 efi_map_region_fixed(md); /* FIXME: add error handling */
802 * Unregister the early EFI memmap from efi_init() and install
803 * the new EFI memory map.
807 if (efi_memmap_init_late(efi.memmap.phys_map,
808 efi.memmap.desc_size * efi.memmap.nr_map)) {
809 pr_err("Failed to remap late EFI memory map\n");
810 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
814 num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE);
815 num_pages >>= PAGE_SHIFT;
817 if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) {
818 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
822 efi_sync_low_kernel_mappings();
823 efi_native_runtime_setup();
828 * This function will switch the EFI runtime services to virtual mode.
829 * Essentially, we look through the EFI memmap and map every region that
830 * has the runtime attribute bit set in its memory descriptor into the
831 * efi_pgd page table.
833 * The new method does a pagetable switch in a preemption-safe manner
834 * so that we're in a different address space when calling a runtime
835 * function. For function arguments passing we do copy the PUDs of the
836 * kernel page table into efi_pgd prior to each call.
838 * Specially for kexec boot, efi runtime maps in previous kernel should
839 * be passed in via setup_data. In that case runtime ranges will be mapped
840 * to the same virtual addresses as the first kernel, see
841 * kexec_enter_virtual_mode().
843 static void __init __efi_enter_virtual_mode(void)
845 int count = 0, pg_shift = 0;
846 void *new_memmap = NULL;
850 if (efi_alloc_page_tables()) {
851 pr_err("Failed to allocate EFI page tables\n");
856 new_memmap = efi_map_regions(&count, &pg_shift);
858 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
862 pa = __pa(new_memmap);
865 * Unregister the early EFI memmap from efi_init() and install
866 * the new EFI memory map that we are about to pass to the
867 * firmware via SetVirtualAddressMap().
871 if (efi_memmap_init_late(pa, efi.memmap.desc_size * count)) {
872 pr_err("Failed to remap late EFI memory map\n");
876 if (efi_enabled(EFI_DBG)) {
877 pr_info("EFI runtime memory map:\n");
881 if (efi_setup_page_tables(pa, 1 << pg_shift))
884 efi_sync_low_kernel_mappings();
886 status = efi_set_virtual_address_map(efi.memmap.desc_size * count,
887 efi.memmap.desc_size,
888 efi.memmap.desc_version,
889 (efi_memory_desc_t *)pa,
891 if (status != EFI_SUCCESS) {
892 pr_err("Unable to switch EFI into virtual mode (status=%lx)!\n",
897 efi_check_for_embedded_firmwares();
898 efi_free_boot_services();
901 efi_native_runtime_setup();
903 efi_thunk_runtime_setup();
906 * Apply more restrictive page table mapping attributes now that
907 * SVAM() has been called and the firmware has performed all
908 * necessary relocation fixups for the new virtual addresses.
910 efi_runtime_update_mappings();
912 /* clean DUMMY object */
913 efi_delete_dummy_variable();
917 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
920 void __init efi_enter_virtual_mode(void)
922 if (efi_enabled(EFI_PARAVIRT))
925 efi.runtime = (efi_runtime_services_t *)efi_runtime;
928 kexec_enter_virtual_mode();
930 __efi_enter_virtual_mode();
932 efi_dump_pagetable();
935 bool efi_is_table_address(unsigned long phys_addr)
939 if (phys_addr == EFI_INVALID_TABLE_ADDR)
942 for (i = 0; i < ARRAY_SIZE(efi_tables); i++)
943 if (*(efi_tables[i]) == phys_addr)
949 char *efi_systab_show_arch(char *str)
951 if (uga_phys != EFI_INVALID_TABLE_ADDR)
952 str += sprintf(str, "UGA=0x%lx\n", uga_phys);
956 #define EFI_FIELD(var) efi_ ## var
958 #define EFI_ATTR_SHOW(name) \
959 static ssize_t name##_show(struct kobject *kobj, \
960 struct kobj_attribute *attr, char *buf) \
962 return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
965 EFI_ATTR_SHOW(fw_vendor);
966 EFI_ATTR_SHOW(runtime);
967 EFI_ATTR_SHOW(config_table);
969 struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
970 struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
971 struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
973 umode_t efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
975 if (attr == &efi_attr_fw_vendor.attr) {
976 if (efi_enabled(EFI_PARAVIRT) ||
977 efi_fw_vendor == EFI_INVALID_TABLE_ADDR)
979 } else if (attr == &efi_attr_runtime.attr) {
980 if (efi_runtime == EFI_INVALID_TABLE_ADDR)
982 } else if (attr == &efi_attr_config_table.attr) {
983 if (efi_config_table == EFI_INVALID_TABLE_ADDR)