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", &prop_phys},
66 {UGA_IO_PROTOCOL_GUID, "UGA", &uga_phys},
68 {UV_SYSTEM_TABLE_GUID, "UVsystab", &uv_systab_phys},
70 {NULL_GUID, NULL, NULL},
73 static const unsigned long * const efi_tables[] = {
88 #ifdef CONFIG_EFI_RCI2_TABLE
95 u64 efi_setup; /* efi setup_data physical address */
97 static int add_efi_memmap __initdata;
98 static int __init setup_add_efi_memmap(char *arg)
103 early_param("add_efi_memmap", setup_add_efi_memmap);
105 void __init efi_find_mirror(void)
107 efi_memory_desc_t *md;
108 u64 mirror_size = 0, total_size = 0;
110 if (!efi_enabled(EFI_MEMMAP))
113 for_each_efi_memory_desc(md) {
114 unsigned long long start = md->phys_addr;
115 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
118 if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
119 memblock_mark_mirror(start, size);
124 pr_info("Memory: %lldM/%lldM mirrored memory\n",
125 mirror_size>>20, total_size>>20);
129 * Tell the kernel about the EFI memory map. This might include
130 * more than the max 128 entries that can fit in the passed in e820
131 * legacy (zeropage) memory map, but the kernel's e820 table can hold
135 static void __init do_add_efi_memmap(void)
137 efi_memory_desc_t *md;
139 if (!efi_enabled(EFI_MEMMAP))
142 for_each_efi_memory_desc(md) {
143 unsigned long long start = md->phys_addr;
144 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
148 case EFI_LOADER_CODE:
149 case EFI_LOADER_DATA:
150 case EFI_BOOT_SERVICES_CODE:
151 case EFI_BOOT_SERVICES_DATA:
152 case EFI_CONVENTIONAL_MEMORY:
153 if (efi_soft_reserve_enabled()
154 && (md->attribute & EFI_MEMORY_SP))
155 e820_type = E820_TYPE_SOFT_RESERVED;
156 else if (md->attribute & EFI_MEMORY_WB)
157 e820_type = E820_TYPE_RAM;
159 e820_type = E820_TYPE_RESERVED;
161 case EFI_ACPI_RECLAIM_MEMORY:
162 e820_type = E820_TYPE_ACPI;
164 case EFI_ACPI_MEMORY_NVS:
165 e820_type = E820_TYPE_NVS;
167 case EFI_UNUSABLE_MEMORY:
168 e820_type = E820_TYPE_UNUSABLE;
170 case EFI_PERSISTENT_MEMORY:
171 e820_type = E820_TYPE_PMEM;
175 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
176 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
177 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
179 e820_type = E820_TYPE_RESERVED;
183 e820__range_add(start, size, e820_type);
185 e820__update_table(e820_table);
189 * Given add_efi_memmap defaults to 0 and there there is no alternative
190 * e820 mechanism for soft-reserved memory, import the full EFI memory
191 * map if soft reservations are present and enabled. Otherwise, the
192 * mechanism to disable the kernel's consideration of EFI_MEMORY_SP is
193 * the efi=nosoftreserve option.
195 static bool do_efi_soft_reserve(void)
197 efi_memory_desc_t *md;
199 if (!efi_enabled(EFI_MEMMAP))
202 if (!efi_soft_reserve_enabled())
205 for_each_efi_memory_desc(md)
206 if (md->type == EFI_CONVENTIONAL_MEMORY &&
207 (md->attribute & EFI_MEMORY_SP))
212 int __init efi_memblock_x86_reserve_range(void)
214 struct efi_info *e = &boot_params.efi_info;
215 struct efi_memory_map_data data;
219 if (efi_enabled(EFI_PARAVIRT))
222 /* Can't handle firmware tables above 4GB on i386 */
223 if (IS_ENABLED(CONFIG_X86_32) && e->efi_memmap_hi > 0) {
224 pr_err("Memory map is above 4GB, disabling EFI.\n");
227 pmap = (phys_addr_t)(e->efi_memmap | ((u64)e->efi_memmap_hi << 32));
229 data.phys_map = pmap;
230 data.size = e->efi_memmap_size;
231 data.desc_size = e->efi_memdesc_size;
232 data.desc_version = e->efi_memdesc_version;
234 rv = efi_memmap_init_early(&data);
238 if (add_efi_memmap || do_efi_soft_reserve())
241 efi_fake_memmap_early();
243 WARN(efi.memmap.desc_version != 1,
244 "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
245 efi.memmap.desc_version);
247 memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size);
252 #define OVERFLOW_ADDR_SHIFT (64 - EFI_PAGE_SHIFT)
253 #define OVERFLOW_ADDR_MASK (U64_MAX << OVERFLOW_ADDR_SHIFT)
254 #define U64_HIGH_BIT (~(U64_MAX >> 1))
256 static bool __init efi_memmap_entry_valid(const efi_memory_desc_t *md, int i)
258 u64 end = (md->num_pages << EFI_PAGE_SHIFT) + md->phys_addr - 1;
262 if (md->num_pages == 0) {
264 } else if (md->num_pages > EFI_PAGES_MAX ||
265 EFI_PAGES_MAX - md->num_pages <
266 (md->phys_addr >> EFI_PAGE_SHIFT)) {
267 end_hi = (md->num_pages & OVERFLOW_ADDR_MASK)
268 >> OVERFLOW_ADDR_SHIFT;
270 if ((md->phys_addr & U64_HIGH_BIT) && !(end & U64_HIGH_BIT))
276 pr_warn_once(FW_BUG "Invalid EFI memory map entries:\n");
279 pr_warn("mem%02u: %s range=[0x%016llx-0x%llx%016llx] (invalid)\n",
280 i, efi_md_typeattr_format(buf, sizeof(buf), md),
281 md->phys_addr, end_hi, end);
283 pr_warn("mem%02u: %s range=[0x%016llx-0x%016llx] (invalid)\n",
284 i, efi_md_typeattr_format(buf, sizeof(buf), md),
290 static void __init efi_clean_memmap(void)
292 efi_memory_desc_t *out = efi.memmap.map;
293 const efi_memory_desc_t *in = out;
294 const efi_memory_desc_t *end = efi.memmap.map_end;
297 for (i = n_removal = 0; in < end; i++) {
298 if (efi_memmap_entry_valid(in, i)) {
300 memcpy(out, in, efi.memmap.desc_size);
301 out = (void *)out + efi.memmap.desc_size;
305 in = (void *)in + efi.memmap.desc_size;
309 struct efi_memory_map_data data = {
310 .phys_map = efi.memmap.phys_map,
311 .desc_version = efi.memmap.desc_version,
312 .desc_size = efi.memmap.desc_size,
313 .size = efi.memmap.desc_size * (efi.memmap.nr_map - n_removal),
317 pr_warn("Removing %d invalid memory map entries.\n", n_removal);
318 efi_memmap_install(&data);
322 void __init efi_print_memmap(void)
324 efi_memory_desc_t *md;
327 for_each_efi_memory_desc(md) {
330 pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n",
331 i++, efi_md_typeattr_format(buf, sizeof(buf), md),
333 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1,
334 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
338 static int __init efi_systab_init(unsigned long phys)
340 int size = efi_enabled(EFI_64BIT) ? sizeof(efi_system_table_64_t)
341 : sizeof(efi_system_table_32_t);
342 const efi_table_hdr_t *hdr;
347 hdr = p = early_memremap_ro(phys, size);
349 pr_err("Couldn't map the system table!\n");
353 ret = efi_systab_check_header(hdr, 1);
355 early_memunmap(p, size);
359 if (efi_enabled(EFI_64BIT)) {
360 const efi_system_table_64_t *systab64 = p;
362 efi_runtime = systab64->runtime;
363 over4g = systab64->runtime > U32_MAX;
366 struct efi_setup_data *data;
368 data = early_memremap_ro(efi_setup, sizeof(*data));
370 early_memunmap(p, size);
374 efi_fw_vendor = (unsigned long)data->fw_vendor;
375 efi_config_table = (unsigned long)data->tables;
377 over4g |= data->fw_vendor > U32_MAX ||
378 data->tables > U32_MAX;
380 early_memunmap(data, sizeof(*data));
382 efi_fw_vendor = systab64->fw_vendor;
383 efi_config_table = systab64->tables;
385 over4g |= systab64->fw_vendor > U32_MAX ||
386 systab64->tables > U32_MAX;
388 efi_nr_tables = systab64->nr_tables;
390 const efi_system_table_32_t *systab32 = p;
392 efi_fw_vendor = systab32->fw_vendor;
393 efi_runtime = systab32->runtime;
394 efi_config_table = systab32->tables;
395 efi_nr_tables = systab32->nr_tables;
398 efi.runtime_version = hdr->revision;
400 efi_systab_report_header(hdr, efi_fw_vendor);
401 early_memunmap(p, size);
403 if (IS_ENABLED(CONFIG_X86_32) && over4g) {
404 pr_err("EFI data located above 4GB, disabling EFI.\n");
411 static int __init efi_config_init(const efi_config_table_type_t *arch_tables)
416 if (efi_nr_tables == 0)
419 if (efi_enabled(EFI_64BIT))
420 sz = sizeof(efi_config_table_64_t);
422 sz = sizeof(efi_config_table_32_t);
425 * Let's see what config tables the firmware passed to us.
427 config_tables = early_memremap(efi_config_table, efi_nr_tables * sz);
428 if (config_tables == NULL) {
429 pr_err("Could not map Configuration table!\n");
433 ret = efi_config_parse_tables(config_tables, efi_nr_tables,
436 early_memunmap(config_tables, efi_nr_tables * sz);
440 void __init efi_init(void)
442 if (IS_ENABLED(CONFIG_X86_32) &&
443 (boot_params.efi_info.efi_systab_hi ||
444 boot_params.efi_info.efi_memmap_hi)) {
445 pr_info("Table located above 4GB, disabling EFI.\n");
449 efi_systab_phys = boot_params.efi_info.efi_systab |
450 ((__u64)boot_params.efi_info.efi_systab_hi << 32);
452 if (efi_systab_init(efi_systab_phys))
455 if (efi_reuse_config(efi_config_table, efi_nr_tables))
458 if (efi_config_init(arch_tables))
462 * Note: We currently don't support runtime services on an EFI
463 * that doesn't match the kernel 32/64-bit mode.
466 if (!efi_runtime_supported())
467 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
469 if (!efi_runtime_supported() || efi_runtime_disabled()) {
474 /* Parse the EFI Properties table if it exists */
475 if (prop_phys != EFI_INVALID_TABLE_ADDR) {
476 efi_properties_table_t *tbl;
478 tbl = early_memremap_ro(prop_phys, sizeof(*tbl));
480 pr_err("Could not map Properties table!\n");
482 if (tbl->memory_protection_attribute &
483 EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
484 set_bit(EFI_NX_PE_DATA, &efi.flags);
486 early_memunmap(tbl, sizeof(*tbl));
490 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
493 if (efi_enabled(EFI_DBG))
497 #if defined(CONFIG_X86_32) || defined(CONFIG_X86_UV)
499 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
503 addr = md->virt_addr;
504 npages = md->num_pages;
506 memrange_efi_to_native(&addr, &npages);
509 set_memory_x(addr, npages);
511 set_memory_nx(addr, npages);
514 void __init runtime_code_page_mkexec(void)
516 efi_memory_desc_t *md;
518 /* Make EFI runtime service code area executable */
519 for_each_efi_memory_desc(md) {
520 if (md->type != EFI_RUNTIME_SERVICES_CODE)
523 efi_set_executable(md, true);
527 void __init efi_memory_uc(u64 addr, unsigned long size)
529 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
532 npages = round_up(size, page_shift) / page_shift;
533 memrange_efi_to_native(&addr, &npages);
534 set_memory_uc(addr, npages);
537 void __init old_map_region(efi_memory_desc_t *md)
539 u64 start_pfn, end_pfn, end;
543 start_pfn = PFN_DOWN(md->phys_addr);
544 size = md->num_pages << PAGE_SHIFT;
545 end = md->phys_addr + size;
546 end_pfn = PFN_UP(end);
548 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
549 va = __va(md->phys_addr);
551 if (!(md->attribute & EFI_MEMORY_WB))
552 efi_memory_uc((u64)(unsigned long)va, size);
554 va = efi_ioremap(md->phys_addr, size,
555 md->type, md->attribute);
557 md->virt_addr = (u64) (unsigned long) va;
559 pr_err("ioremap of 0x%llX failed!\n",
560 (unsigned long long)md->phys_addr);
565 /* Merge contiguous regions of the same type and attribute */
566 static void __init efi_merge_regions(void)
568 efi_memory_desc_t *md, *prev_md = NULL;
570 for_each_efi_memory_desc(md) {
578 if (prev_md->type != md->type ||
579 prev_md->attribute != md->attribute) {
584 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
586 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
587 prev_md->num_pages += md->num_pages;
588 md->type = EFI_RESERVED_TYPE;
596 static void *realloc_pages(void *old_memmap, int old_shift)
600 ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
605 * A first-time allocation doesn't have anything to copy.
610 memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
613 free_pages((unsigned long)old_memmap, old_shift);
618 * Iterate the EFI memory map in reverse order because the regions
619 * will be mapped top-down. The end result is the same as if we had
620 * mapped things forward, but doesn't require us to change the
621 * existing implementation of efi_map_region().
623 static inline void *efi_map_next_entry_reverse(void *entry)
627 return efi.memmap.map_end - efi.memmap.desc_size;
629 entry -= efi.memmap.desc_size;
630 if (entry < efi.memmap.map)
637 * efi_map_next_entry - Return the next EFI memory map descriptor
638 * @entry: Previous EFI memory map descriptor
640 * This is a helper function to iterate over the EFI memory map, which
641 * we do in different orders depending on the current configuration.
643 * To begin traversing the memory map @entry must be %NULL.
645 * Returns %NULL when we reach the end of the memory map.
647 static void *efi_map_next_entry(void *entry)
649 if (!efi_have_uv1_memmap() && efi_enabled(EFI_64BIT)) {
651 * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE
652 * config table feature requires us to map all entries
653 * in the same order as they appear in the EFI memory
654 * map. That is to say, entry N must have a lower
655 * virtual address than entry N+1. This is because the
656 * firmware toolchain leaves relative references in
657 * the code/data sections, which are split and become
658 * separate EFI memory regions. Mapping things
659 * out-of-order leads to the firmware accessing
660 * unmapped addresses.
662 * Since we need to map things this way whether or not
663 * the kernel actually makes use of
664 * EFI_PROPERTIES_TABLE, let's just switch to this
665 * scheme by default for 64-bit.
667 return efi_map_next_entry_reverse(entry);
672 return efi.memmap.map;
674 entry += efi.memmap.desc_size;
675 if (entry >= efi.memmap.map_end)
681 static bool should_map_region(efi_memory_desc_t *md)
684 * Runtime regions always require runtime mappings (obviously).
686 if (md->attribute & EFI_MEMORY_RUNTIME)
690 * 32-bit EFI doesn't suffer from the bug that requires us to
691 * reserve boot services regions, and mixed mode support
692 * doesn't exist for 32-bit kernels.
694 if (IS_ENABLED(CONFIG_X86_32))
698 * EFI specific purpose memory may be reserved by default
699 * depending on kernel config and boot options.
701 if (md->type == EFI_CONVENTIONAL_MEMORY &&
702 efi_soft_reserve_enabled() &&
703 (md->attribute & EFI_MEMORY_SP))
707 * Map all of RAM so that we can access arguments in the 1:1
708 * mapping when making EFI runtime calls.
710 if (efi_is_mixed()) {
711 if (md->type == EFI_CONVENTIONAL_MEMORY ||
712 md->type == EFI_LOADER_DATA ||
713 md->type == EFI_LOADER_CODE)
718 * Map boot services regions as a workaround for buggy
719 * firmware that accesses them even when they shouldn't.
721 * See efi_{reserve,free}_boot_services().
723 if (md->type == EFI_BOOT_SERVICES_CODE ||
724 md->type == EFI_BOOT_SERVICES_DATA)
731 * Map the efi memory ranges of the runtime services and update new_mmap with
734 static void * __init efi_map_regions(int *count, int *pg_shift)
736 void *p, *new_memmap = NULL;
737 unsigned long left = 0;
738 unsigned long desc_size;
739 efi_memory_desc_t *md;
741 desc_size = efi.memmap.desc_size;
744 while ((p = efi_map_next_entry(p))) {
747 if (!should_map_region(md))
752 if (left < desc_size) {
753 new_memmap = realloc_pages(new_memmap, *pg_shift);
757 left += PAGE_SIZE << *pg_shift;
761 memcpy(new_memmap + (*count * desc_size), md, desc_size);
770 static void __init kexec_enter_virtual_mode(void)
772 #ifdef CONFIG_KEXEC_CORE
773 efi_memory_desc_t *md;
774 unsigned int num_pages;
777 * We don't do virtual mode, since we don't do runtime services, on
778 * non-native EFI. With the UV1 memmap, we don't do runtime services in
779 * kexec kernel because in the initial boot something else might
780 * have been mapped at these virtual addresses.
782 if (efi_is_mixed() || efi_have_uv1_memmap()) {
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 old method which used to update that memory descriptor with the
834 * virtual address obtained from ioremap() is still supported when the
835 * kernel is booted on SG1 UV1 hardware. Same old method enabled the
836 * runtime services to be called without having to thunk back into
837 * physical mode for every invocation.
839 * The new method does a pagetable switch in a preemption-safe manner
840 * so that we're in a different address space when calling a runtime
841 * function. For function arguments passing we do copy the PUDs of the
842 * kernel page table into efi_pgd prior to each call.
844 * Specially for kexec boot, efi runtime maps in previous kernel should
845 * be passed in via setup_data. In that case runtime ranges will be mapped
846 * to the same virtual addresses as the first kernel, see
847 * kexec_enter_virtual_mode().
849 static void __init __efi_enter_virtual_mode(void)
851 int count = 0, pg_shift = 0;
852 void *new_memmap = NULL;
856 if (efi_alloc_page_tables()) {
857 pr_err("Failed to allocate EFI page tables\n");
862 new_memmap = efi_map_regions(&count, &pg_shift);
864 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
868 pa = __pa(new_memmap);
871 * Unregister the early EFI memmap from efi_init() and install
872 * the new EFI memory map that we are about to pass to the
873 * firmware via SetVirtualAddressMap().
877 if (efi_memmap_init_late(pa, efi.memmap.desc_size * count)) {
878 pr_err("Failed to remap late EFI memory map\n");
882 if (efi_enabled(EFI_DBG)) {
883 pr_info("EFI runtime memory map:\n");
887 if (efi_setup_page_tables(pa, 1 << pg_shift))
890 efi_sync_low_kernel_mappings();
892 status = efi_set_virtual_address_map(efi.memmap.desc_size * count,
893 efi.memmap.desc_size,
894 efi.memmap.desc_version,
895 (efi_memory_desc_t *)pa,
897 if (status != EFI_SUCCESS) {
898 pr_err("Unable to switch EFI into virtual mode (status=%lx)!\n",
903 efi_free_boot_services();
906 efi_native_runtime_setup();
908 efi_thunk_runtime_setup();
911 * Apply more restrictive page table mapping attributes now that
912 * SVAM() has been called and the firmware has performed all
913 * necessary relocation fixups for the new virtual addresses.
915 efi_runtime_update_mappings();
917 /* clean DUMMY object */
918 efi_delete_dummy_variable();
922 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
925 void __init efi_enter_virtual_mode(void)
927 if (efi_enabled(EFI_PARAVIRT))
930 efi.runtime = (efi_runtime_services_t *)efi_runtime;
933 kexec_enter_virtual_mode();
935 __efi_enter_virtual_mode();
937 efi_dump_pagetable();
940 bool efi_is_table_address(unsigned long phys_addr)
944 if (phys_addr == EFI_INVALID_TABLE_ADDR)
947 for (i = 0; i < ARRAY_SIZE(efi_tables); i++)
948 if (*(efi_tables[i]) == phys_addr)
954 char *efi_systab_show_arch(char *str)
956 if (uga_phys != EFI_INVALID_TABLE_ADDR)
957 str += sprintf(str, "UGA=0x%lx\n", uga_phys);
961 #define EFI_FIELD(var) efi_ ## var
963 #define EFI_ATTR_SHOW(name) \
964 static ssize_t name##_show(struct kobject *kobj, \
965 struct kobj_attribute *attr, char *buf) \
967 return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
970 EFI_ATTR_SHOW(fw_vendor);
971 EFI_ATTR_SHOW(runtime);
972 EFI_ATTR_SHOW(config_table);
974 struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
975 struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
976 struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
978 umode_t efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
980 if (attr == &efi_attr_fw_vendor.attr) {
981 if (efi_enabled(EFI_PARAVIRT) ||
982 efi_fw_vendor == EFI_INVALID_TABLE_ADDR)
984 } else if (attr == &efi_attr_runtime.attr) {
985 if (efi_runtime == EFI_INVALID_TABLE_ADDR)
987 } else if (attr == &efi_attr_config_table.attr) {
988 if (efi_config_table == EFI_INVALID_TABLE_ADDR)