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/tlbflush.h>
53 #include <asm/x86_init.h>
54 #include <asm/uv/uv.h>
56 static unsigned long efi_systab_phys __initdata;
57 static unsigned long prop_phys = EFI_INVALID_TABLE_ADDR;
58 static unsigned long uga_phys = EFI_INVALID_TABLE_ADDR;
59 static unsigned long efi_runtime, efi_nr_tables;
61 unsigned long efi_fw_vendor, efi_config_table;
63 static const efi_config_table_type_t arch_tables[] __initconst = {
64 {EFI_PROPERTIES_TABLE_GUID, &prop_phys, "PROP" },
65 {UGA_IO_PROTOCOL_GUID, &uga_phys, "UGA" },
67 {UV_SYSTEM_TABLE_GUID, &uv_systab_phys, "UVsystab" },
72 static const unsigned long * const efi_tables[] = {
87 #ifdef CONFIG_EFI_RCI2_TABLE
93 #ifdef CONFIG_LOAD_UEFI_KEYS
96 #ifdef CONFIG_EFI_COCO_SECRET
101 u64 efi_setup; /* efi setup_data physical address */
103 static int add_efi_memmap __initdata;
104 static int __init setup_add_efi_memmap(char *arg)
109 early_param("add_efi_memmap", setup_add_efi_memmap);
112 * Tell the kernel about the EFI memory map. This might include
113 * more than the max 128 entries that can fit in the passed in e820
114 * legacy (zeropage) memory map, but the kernel's e820 table can hold
118 static void __init do_add_efi_memmap(void)
120 efi_memory_desc_t *md;
122 if (!efi_enabled(EFI_MEMMAP))
125 for_each_efi_memory_desc(md) {
126 unsigned long long start = md->phys_addr;
127 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
131 case EFI_LOADER_CODE:
132 case EFI_LOADER_DATA:
133 case EFI_BOOT_SERVICES_CODE:
134 case EFI_BOOT_SERVICES_DATA:
135 case EFI_CONVENTIONAL_MEMORY:
136 if (efi_soft_reserve_enabled()
137 && (md->attribute & EFI_MEMORY_SP))
138 e820_type = E820_TYPE_SOFT_RESERVED;
139 else if (md->attribute & EFI_MEMORY_WB)
140 e820_type = E820_TYPE_RAM;
142 e820_type = E820_TYPE_RESERVED;
144 case EFI_ACPI_RECLAIM_MEMORY:
145 e820_type = E820_TYPE_ACPI;
147 case EFI_ACPI_MEMORY_NVS:
148 e820_type = E820_TYPE_NVS;
150 case EFI_UNUSABLE_MEMORY:
151 e820_type = E820_TYPE_UNUSABLE;
153 case EFI_PERSISTENT_MEMORY:
154 e820_type = E820_TYPE_PMEM;
158 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
159 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
160 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
162 e820_type = E820_TYPE_RESERVED;
166 e820__range_add(start, size, e820_type);
168 e820__update_table(e820_table);
172 * Given add_efi_memmap defaults to 0 and there is no alternative
173 * e820 mechanism for soft-reserved memory, import the full EFI memory
174 * map if soft reservations are present and enabled. Otherwise, the
175 * mechanism to disable the kernel's consideration of EFI_MEMORY_SP is
176 * the efi=nosoftreserve option.
178 static bool do_efi_soft_reserve(void)
180 efi_memory_desc_t *md;
182 if (!efi_enabled(EFI_MEMMAP))
185 if (!efi_soft_reserve_enabled())
188 for_each_efi_memory_desc(md)
189 if (md->type == EFI_CONVENTIONAL_MEMORY &&
190 (md->attribute & EFI_MEMORY_SP))
195 int __init efi_memblock_x86_reserve_range(void)
197 struct efi_info *e = &boot_params.efi_info;
198 struct efi_memory_map_data data;
202 if (efi_enabled(EFI_PARAVIRT))
205 /* Can't handle firmware tables above 4GB on i386 */
206 if (IS_ENABLED(CONFIG_X86_32) && e->efi_memmap_hi > 0) {
207 pr_err("Memory map is above 4GB, disabling EFI.\n");
210 pmap = (phys_addr_t)(e->efi_memmap | ((u64)e->efi_memmap_hi << 32));
212 data.phys_map = pmap;
213 data.size = e->efi_memmap_size;
214 data.desc_size = e->efi_memdesc_size;
215 data.desc_version = e->efi_memdesc_version;
217 if (!efi_enabled(EFI_PARAVIRT)) {
218 rv = efi_memmap_init_early(&data);
223 if (add_efi_memmap || do_efi_soft_reserve())
226 efi_fake_memmap_early();
228 WARN(efi.memmap.desc_version != 1,
229 "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
230 efi.memmap.desc_version);
232 memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size);
233 set_bit(EFI_PRESERVE_BS_REGIONS, &efi.flags);
238 #define OVERFLOW_ADDR_SHIFT (64 - EFI_PAGE_SHIFT)
239 #define OVERFLOW_ADDR_MASK (U64_MAX << OVERFLOW_ADDR_SHIFT)
240 #define U64_HIGH_BIT (~(U64_MAX >> 1))
242 static bool __init efi_memmap_entry_valid(const efi_memory_desc_t *md, int i)
244 u64 end = (md->num_pages << EFI_PAGE_SHIFT) + md->phys_addr - 1;
248 if (md->num_pages == 0) {
250 } else if (md->num_pages > EFI_PAGES_MAX ||
251 EFI_PAGES_MAX - md->num_pages <
252 (md->phys_addr >> EFI_PAGE_SHIFT)) {
253 end_hi = (md->num_pages & OVERFLOW_ADDR_MASK)
254 >> OVERFLOW_ADDR_SHIFT;
256 if ((md->phys_addr & U64_HIGH_BIT) && !(end & U64_HIGH_BIT))
262 pr_warn_once(FW_BUG "Invalid EFI memory map entries:\n");
265 pr_warn("mem%02u: %s range=[0x%016llx-0x%llx%016llx] (invalid)\n",
266 i, efi_md_typeattr_format(buf, sizeof(buf), md),
267 md->phys_addr, end_hi, end);
269 pr_warn("mem%02u: %s range=[0x%016llx-0x%016llx] (invalid)\n",
270 i, efi_md_typeattr_format(buf, sizeof(buf), md),
276 static void __init efi_clean_memmap(void)
278 efi_memory_desc_t *out = efi.memmap.map;
279 const efi_memory_desc_t *in = out;
280 const efi_memory_desc_t *end = efi.memmap.map_end;
283 for (i = n_removal = 0; in < end; i++) {
284 if (efi_memmap_entry_valid(in, i)) {
286 memcpy(out, in, efi.memmap.desc_size);
287 out = (void *)out + efi.memmap.desc_size;
291 in = (void *)in + efi.memmap.desc_size;
295 struct efi_memory_map_data data = {
296 .phys_map = efi.memmap.phys_map,
297 .desc_version = efi.memmap.desc_version,
298 .desc_size = efi.memmap.desc_size,
299 .size = efi.memmap.desc_size * (efi.memmap.nr_map - n_removal),
303 pr_warn("Removing %d invalid memory map entries.\n", n_removal);
304 efi_memmap_install(&data);
309 * Firmware can use EfiMemoryMappedIO to request that MMIO regions be
310 * mapped by the OS so they can be accessed by EFI runtime services, but
311 * should have no other significance to the OS (UEFI r2.10, sec 7.2).
312 * However, most bootloaders and EFI stubs convert EfiMemoryMappedIO
313 * regions to E820_TYPE_RESERVED entries, which prevent Linux from
314 * allocating space from them (see remove_e820_regions()).
316 * Some platforms use EfiMemoryMappedIO entries for PCI MMCONFIG space and
317 * PCI host bridge windows, which means Linux can't allocate BAR space for
320 * Remove large EfiMemoryMappedIO regions from the E820 map to avoid this
323 * Retain small EfiMemoryMappedIO regions because on some platforms, these
324 * describe non-window space that's included in host bridge _CRS. If we
325 * assign that space to PCI devices, they don't work.
327 static void __init efi_remove_e820_mmio(void)
329 efi_memory_desc_t *md;
330 u64 size, start, end;
333 for_each_efi_memory_desc(md) {
334 if (md->type == EFI_MEMORY_MAPPED_IO) {
335 size = md->num_pages << EFI_PAGE_SHIFT;
336 start = md->phys_addr;
337 end = start + size - 1;
338 if (size >= 256*1024) {
339 pr_info("Remove mem%02u: MMIO range=[0x%08llx-0x%08llx] (%lluMB) from e820 map\n",
340 i, start, end, size >> 20);
341 e820__range_remove(start, size,
342 E820_TYPE_RESERVED, 1);
344 pr_info("Not removing mem%02u: MMIO range=[0x%08llx-0x%08llx] (%lluKB) from e820 map\n",
345 i, start, end, size >> 10);
352 void __init efi_print_memmap(void)
354 efi_memory_desc_t *md;
357 for_each_efi_memory_desc(md) {
360 pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n",
361 i++, efi_md_typeattr_format(buf, sizeof(buf), md),
363 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1,
364 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
368 static int __init efi_systab_init(unsigned long phys)
370 int size = efi_enabled(EFI_64BIT) ? sizeof(efi_system_table_64_t)
371 : sizeof(efi_system_table_32_t);
372 const efi_table_hdr_t *hdr;
377 hdr = p = early_memremap_ro(phys, size);
379 pr_err("Couldn't map the system table!\n");
383 ret = efi_systab_check_header(hdr);
385 early_memunmap(p, size);
389 if (efi_enabled(EFI_64BIT)) {
390 const efi_system_table_64_t *systab64 = p;
392 efi_runtime = systab64->runtime;
393 over4g = systab64->runtime > U32_MAX;
396 struct efi_setup_data *data;
398 data = early_memremap_ro(efi_setup, sizeof(*data));
400 early_memunmap(p, size);
404 efi_fw_vendor = (unsigned long)data->fw_vendor;
405 efi_config_table = (unsigned long)data->tables;
407 over4g |= data->fw_vendor > U32_MAX ||
408 data->tables > U32_MAX;
410 early_memunmap(data, sizeof(*data));
412 efi_fw_vendor = systab64->fw_vendor;
413 efi_config_table = systab64->tables;
415 over4g |= systab64->fw_vendor > U32_MAX ||
416 systab64->tables > U32_MAX;
418 efi_nr_tables = systab64->nr_tables;
420 const efi_system_table_32_t *systab32 = p;
422 efi_fw_vendor = systab32->fw_vendor;
423 efi_runtime = systab32->runtime;
424 efi_config_table = systab32->tables;
425 efi_nr_tables = systab32->nr_tables;
428 efi.runtime_version = hdr->revision;
430 efi_systab_report_header(hdr, efi_fw_vendor);
431 early_memunmap(p, size);
433 if (IS_ENABLED(CONFIG_X86_32) && over4g) {
434 pr_err("EFI data located above 4GB, disabling EFI.\n");
441 static int __init efi_config_init(const efi_config_table_type_t *arch_tables)
446 if (efi_nr_tables == 0)
449 if (efi_enabled(EFI_64BIT))
450 sz = sizeof(efi_config_table_64_t);
452 sz = sizeof(efi_config_table_32_t);
455 * Let's see what config tables the firmware passed to us.
457 config_tables = early_memremap(efi_config_table, efi_nr_tables * sz);
458 if (config_tables == NULL) {
459 pr_err("Could not map Configuration table!\n");
463 ret = efi_config_parse_tables(config_tables, efi_nr_tables,
466 early_memunmap(config_tables, efi_nr_tables * sz);
470 void __init efi_init(void)
472 if (IS_ENABLED(CONFIG_X86_32) &&
473 (boot_params.efi_info.efi_systab_hi ||
474 boot_params.efi_info.efi_memmap_hi)) {
475 pr_info("Table located above 4GB, disabling EFI.\n");
479 efi_systab_phys = boot_params.efi_info.efi_systab |
480 ((__u64)boot_params.efi_info.efi_systab_hi << 32);
482 if (efi_systab_init(efi_systab_phys))
485 if (efi_reuse_config(efi_config_table, efi_nr_tables))
488 if (efi_config_init(arch_tables))
492 * Note: We currently don't support runtime services on an EFI
493 * that doesn't match the kernel 32/64-bit mode.
496 if (!efi_runtime_supported())
497 pr_err("No EFI runtime due to 32/64-bit mismatch with kernel\n");
499 if (!efi_runtime_supported() || efi_runtime_disabled()) {
504 /* Parse the EFI Properties table if it exists */
505 if (prop_phys != EFI_INVALID_TABLE_ADDR) {
506 efi_properties_table_t *tbl;
508 tbl = early_memremap_ro(prop_phys, sizeof(*tbl));
510 pr_err("Could not map Properties table!\n");
512 if (tbl->memory_protection_attribute &
513 EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
514 set_bit(EFI_NX_PE_DATA, &efi.flags);
516 early_memunmap(tbl, sizeof(*tbl));
520 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
523 efi_remove_e820_mmio();
525 if (efi_enabled(EFI_DBG))
529 /* Merge contiguous regions of the same type and attribute */
530 static void __init efi_merge_regions(void)
532 efi_memory_desc_t *md, *prev_md = NULL;
534 for_each_efi_memory_desc(md) {
542 if (prev_md->type != md->type ||
543 prev_md->attribute != md->attribute) {
548 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
550 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
551 prev_md->num_pages += md->num_pages;
552 md->type = EFI_RESERVED_TYPE;
560 static void *realloc_pages(void *old_memmap, int old_shift)
564 ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
569 * A first-time allocation doesn't have anything to copy.
574 memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
577 free_pages((unsigned long)old_memmap, old_shift);
582 * Iterate the EFI memory map in reverse order because the regions
583 * will be mapped top-down. The end result is the same as if we had
584 * mapped things forward, but doesn't require us to change the
585 * existing implementation of efi_map_region().
587 static inline void *efi_map_next_entry_reverse(void *entry)
591 return efi.memmap.map_end - efi.memmap.desc_size;
593 entry -= efi.memmap.desc_size;
594 if (entry < efi.memmap.map)
601 * efi_map_next_entry - Return the next EFI memory map descriptor
602 * @entry: Previous EFI memory map descriptor
604 * This is a helper function to iterate over the EFI memory map, which
605 * we do in different orders depending on the current configuration.
607 * To begin traversing the memory map @entry must be %NULL.
609 * Returns %NULL when we reach the end of the memory map.
611 static void *efi_map_next_entry(void *entry)
613 if (efi_enabled(EFI_64BIT)) {
615 * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE
616 * config table feature requires us to map all entries
617 * in the same order as they appear in the EFI memory
618 * map. That is to say, entry N must have a lower
619 * virtual address than entry N+1. This is because the
620 * firmware toolchain leaves relative references in
621 * the code/data sections, which are split and become
622 * separate EFI memory regions. Mapping things
623 * out-of-order leads to the firmware accessing
624 * unmapped addresses.
626 * Since we need to map things this way whether or not
627 * the kernel actually makes use of
628 * EFI_PROPERTIES_TABLE, let's just switch to this
629 * scheme by default for 64-bit.
631 return efi_map_next_entry_reverse(entry);
636 return efi.memmap.map;
638 entry += efi.memmap.desc_size;
639 if (entry >= efi.memmap.map_end)
645 static bool should_map_region(efi_memory_desc_t *md)
648 * Runtime regions always require runtime mappings (obviously).
650 if (md->attribute & EFI_MEMORY_RUNTIME)
654 * 32-bit EFI doesn't suffer from the bug that requires us to
655 * reserve boot services regions, and mixed mode support
656 * doesn't exist for 32-bit kernels.
658 if (IS_ENABLED(CONFIG_X86_32))
662 * EFI specific purpose memory may be reserved by default
663 * depending on kernel config and boot options.
665 if (md->type == EFI_CONVENTIONAL_MEMORY &&
666 efi_soft_reserve_enabled() &&
667 (md->attribute & EFI_MEMORY_SP))
671 * Map all of RAM so that we can access arguments in the 1:1
672 * mapping when making EFI runtime calls.
674 if (efi_is_mixed()) {
675 if (md->type == EFI_CONVENTIONAL_MEMORY ||
676 md->type == EFI_LOADER_DATA ||
677 md->type == EFI_LOADER_CODE)
682 * Map boot services regions as a workaround for buggy
683 * firmware that accesses them even when they shouldn't.
685 * See efi_{reserve,free}_boot_services().
687 if (md->type == EFI_BOOT_SERVICES_CODE ||
688 md->type == EFI_BOOT_SERVICES_DATA)
695 * Map the efi memory ranges of the runtime services and update new_mmap with
698 static void * __init efi_map_regions(int *count, int *pg_shift)
700 void *p, *new_memmap = NULL;
701 unsigned long left = 0;
702 unsigned long desc_size;
703 efi_memory_desc_t *md;
705 desc_size = efi.memmap.desc_size;
708 while ((p = efi_map_next_entry(p))) {
711 if (!should_map_region(md))
716 if (left < desc_size) {
717 new_memmap = realloc_pages(new_memmap, *pg_shift);
721 left += PAGE_SIZE << *pg_shift;
725 memcpy(new_memmap + (*count * desc_size), md, desc_size);
734 static void __init kexec_enter_virtual_mode(void)
736 #ifdef CONFIG_KEXEC_CORE
737 efi_memory_desc_t *md;
738 unsigned int num_pages;
741 * We don't do virtual mode, since we don't do runtime services, on
744 if (efi_is_mixed()) {
746 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
750 if (efi_alloc_page_tables()) {
751 pr_err("Failed to allocate EFI page tables\n");
752 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
757 * Map efi regions which were passed via setup_data. The virt_addr is a
758 * fixed addr which was used in first kernel of a kexec boot.
760 for_each_efi_memory_desc(md)
761 efi_map_region_fixed(md); /* FIXME: add error handling */
764 * Unregister the early EFI memmap from efi_init() and install
765 * the new EFI memory map.
769 if (efi_memmap_init_late(efi.memmap.phys_map,
770 efi.memmap.desc_size * efi.memmap.nr_map)) {
771 pr_err("Failed to remap late EFI memory map\n");
772 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
776 num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE);
777 num_pages >>= PAGE_SHIFT;
779 if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) {
780 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
784 efi_sync_low_kernel_mappings();
785 efi_native_runtime_setup();
790 * This function will switch the EFI runtime services to virtual mode.
791 * Essentially, we look through the EFI memmap and map every region that
792 * has the runtime attribute bit set in its memory descriptor into the
793 * efi_pgd page table.
795 * The new method does a pagetable switch in a preemption-safe manner
796 * so that we're in a different address space when calling a runtime
797 * function. For function arguments passing we do copy the PUDs of the
798 * kernel page table into efi_pgd prior to each call.
800 * Specially for kexec boot, efi runtime maps in previous kernel should
801 * be passed in via setup_data. In that case runtime ranges will be mapped
802 * to the same virtual addresses as the first kernel, see
803 * kexec_enter_virtual_mode().
805 static void __init __efi_enter_virtual_mode(void)
807 int count = 0, pg_shift = 0;
808 void *new_memmap = NULL;
812 if (efi_alloc_page_tables()) {
813 pr_err("Failed to allocate EFI page tables\n");
818 new_memmap = efi_map_regions(&count, &pg_shift);
820 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
824 pa = __pa(new_memmap);
827 * Unregister the early EFI memmap from efi_init() and install
828 * the new EFI memory map that we are about to pass to the
829 * firmware via SetVirtualAddressMap().
833 if (efi_memmap_init_late(pa, efi.memmap.desc_size * count)) {
834 pr_err("Failed to remap late EFI memory map\n");
838 if (efi_enabled(EFI_DBG)) {
839 pr_info("EFI runtime memory map:\n");
843 if (efi_setup_page_tables(pa, 1 << pg_shift))
846 efi_sync_low_kernel_mappings();
848 status = efi_set_virtual_address_map(efi.memmap.desc_size * count,
849 efi.memmap.desc_size,
850 efi.memmap.desc_version,
851 (efi_memory_desc_t *)pa,
853 if (status != EFI_SUCCESS) {
854 pr_err("Unable to switch EFI into virtual mode (status=%lx)!\n",
859 efi_check_for_embedded_firmwares();
860 efi_free_boot_services();
863 efi_native_runtime_setup();
865 efi_thunk_runtime_setup();
868 * Apply more restrictive page table mapping attributes now that
869 * SVAM() has been called and the firmware has performed all
870 * necessary relocation fixups for the new virtual addresses.
872 efi_runtime_update_mappings();
874 /* clean DUMMY object */
875 efi_delete_dummy_variable();
879 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
882 void __init efi_enter_virtual_mode(void)
884 if (efi_enabled(EFI_PARAVIRT))
887 efi.runtime = (efi_runtime_services_t *)efi_runtime;
890 kexec_enter_virtual_mode();
892 __efi_enter_virtual_mode();
894 efi_dump_pagetable();
897 bool efi_is_table_address(unsigned long phys_addr)
901 if (phys_addr == EFI_INVALID_TABLE_ADDR)
904 for (i = 0; i < ARRAY_SIZE(efi_tables); i++)
905 if (*(efi_tables[i]) == phys_addr)
911 char *efi_systab_show_arch(char *str)
913 if (uga_phys != EFI_INVALID_TABLE_ADDR)
914 str += sprintf(str, "UGA=0x%lx\n", uga_phys);
918 #define EFI_FIELD(var) efi_ ## var
920 #define EFI_ATTR_SHOW(name) \
921 static ssize_t name##_show(struct kobject *kobj, \
922 struct kobj_attribute *attr, char *buf) \
924 return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
927 EFI_ATTR_SHOW(fw_vendor);
928 EFI_ATTR_SHOW(runtime);
929 EFI_ATTR_SHOW(config_table);
931 struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
932 struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
933 struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
935 umode_t efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
937 if (attr == &efi_attr_fw_vendor.attr) {
938 if (efi_enabled(EFI_PARAVIRT) ||
939 efi_fw_vendor == EFI_INVALID_TABLE_ADDR)
941 } else if (attr == &efi_attr_runtime.attr) {
942 if (efi_runtime == EFI_INVALID_TABLE_ADDR)
944 } else if (attr == &efi_attr_config_table.attr) {
945 if (efi_config_table == EFI_INVALID_TABLE_ADDR)