2 * Common EFI (Extensible Firmware Interface) support functions
3 * Based on Extensible Firmware Interface Specification version 1.0
5 * Copyright (C) 1999 VA Linux Systems
6 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
7 * Copyright (C) 1999-2002 Hewlett-Packard Co.
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 * Stephane Eranian <eranian@hpl.hp.com>
10 * Copyright (C) 2005-2008 Intel Co.
11 * Fenghua Yu <fenghua.yu@intel.com>
12 * Bibo Mao <bibo.mao@intel.com>
13 * Chandramouli Narayanan <mouli@linux.intel.com>
14 * Huang Ying <ying.huang@intel.com>
15 * Copyright (C) 2013 SuSE Labs
16 * Borislav Petkov <bp@suse.de> - runtime services VA mapping
18 * Copied from efi_32.c to eliminate the duplicated code between EFI
19 * 32/64 support code. --ying 2007-10-26
21 * All EFI Runtime Services are not implemented yet as EFI only
22 * supports physical mode addressing on SoftSDV. This is to be fixed
23 * in a future version. --drummond 1999-07-20
25 * Implemented EFI runtime services and virtual mode calls. --davidm
27 * Goutham Rao: <goutham.rao@intel.com>
28 * Skip non-WB memory and ignore empty memory ranges.
31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33 #include <linux/kernel.h>
34 #include <linux/init.h>
35 #include <linux/efi.h>
36 #include <linux/efi-bgrt.h>
37 #include <linux/export.h>
38 #include <linux/bootmem.h>
39 #include <linux/slab.h>
40 #include <linux/memblock.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>
51 #include <asm/cacheflush.h>
52 #include <asm/tlbflush.h>
53 #include <asm/x86_init.h>
55 #include <asm/uv/uv.h>
59 struct efi_memory_map memmap;
61 static struct efi efi_phys __initdata;
62 static efi_system_table_t efi_systab __initdata;
64 static efi_config_table_type_t arch_tables[] __initdata = {
66 {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab},
68 {NULL_GUID, NULL, NULL},
71 u64 efi_setup; /* efi setup_data physical address */
73 static int add_efi_memmap __initdata;
74 static int __init setup_add_efi_memmap(char *arg)
79 early_param("add_efi_memmap", setup_add_efi_memmap);
81 static efi_status_t __init phys_efi_set_virtual_address_map(
82 unsigned long memory_map_size,
83 unsigned long descriptor_size,
84 u32 descriptor_version,
85 efi_memory_desc_t *virtual_map)
91 save_pgd = efi_call_phys_prolog();
93 /* Disable interrupts around EFI calls: */
94 local_irq_save(flags);
95 status = efi_call_phys(efi_phys.set_virtual_address_map,
96 memory_map_size, descriptor_size,
97 descriptor_version, virtual_map);
98 local_irq_restore(flags);
100 efi_call_phys_epilog(save_pgd);
105 void efi_get_time(struct timespec *now)
111 status = efi.get_time(&eft, &cap);
112 if (status != EFI_SUCCESS)
113 pr_err("Oops: efitime: can't read time!\n");
115 now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour,
116 eft.minute, eft.second);
120 void __init efi_find_mirror(void)
123 u64 mirror_size = 0, total_size = 0;
125 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
126 efi_memory_desc_t *md = p;
127 unsigned long long start = md->phys_addr;
128 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
131 if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
132 memblock_mark_mirror(start, size);
137 pr_info("Memory: %lldM/%lldM mirrored memory\n",
138 mirror_size>>20, total_size>>20);
142 * Tell the kernel about the EFI memory map. This might include
143 * more than the max 128 entries that can fit in the e820 legacy
144 * (zeropage) memory map.
147 static void __init do_add_efi_memmap(void)
151 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
152 efi_memory_desc_t *md = p;
153 unsigned long long start = md->phys_addr;
154 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
158 case EFI_LOADER_CODE:
159 case EFI_LOADER_DATA:
160 case EFI_BOOT_SERVICES_CODE:
161 case EFI_BOOT_SERVICES_DATA:
162 case EFI_CONVENTIONAL_MEMORY:
163 if (md->attribute & EFI_MEMORY_WB)
164 e820_type = E820_RAM;
166 e820_type = E820_RESERVED;
168 case EFI_ACPI_RECLAIM_MEMORY:
169 e820_type = E820_ACPI;
171 case EFI_ACPI_MEMORY_NVS:
172 e820_type = E820_NVS;
174 case EFI_UNUSABLE_MEMORY:
175 e820_type = E820_UNUSABLE;
179 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
180 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
181 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
183 e820_type = E820_RESERVED;
186 e820_add_region(start, size, e820_type);
188 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
191 int __init efi_memblock_x86_reserve_range(void)
193 struct efi_info *e = &boot_params.efi_info;
196 if (efi_enabled(EFI_PARAVIRT))
200 /* Can't handle data above 4GB at this time */
201 if (e->efi_memmap_hi) {
202 pr_err("Memory map is above 4GB, disabling EFI.\n");
205 pmap = e->efi_memmap;
207 pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
209 memmap.phys_map = (void *)pmap;
210 memmap.nr_map = e->efi_memmap_size /
212 memmap.desc_size = e->efi_memdesc_size;
213 memmap.desc_version = e->efi_memdesc_version;
215 memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
217 efi.memmap = &memmap;
222 static void __init print_efi_memmap(void)
225 efi_memory_desc_t *md;
229 for (p = memmap.map, i = 0;
231 p += memmap.desc_size, i++) {
235 pr_info("mem%02u: %s range=[0x%016llx-0x%016llx) (%lluMB)\n",
236 i, efi_md_typeattr_format(buf, sizeof(buf), md),
238 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
239 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
241 #endif /* EFI_DEBUG */
244 void __init efi_unmap_memmap(void)
246 clear_bit(EFI_MEMMAP, &efi.flags);
248 early_memunmap(memmap.map, memmap.nr_map * memmap.desc_size);
253 static int __init efi_systab_init(void *phys)
255 if (efi_enabled(EFI_64BIT)) {
256 efi_system_table_64_t *systab64;
257 struct efi_setup_data *data = NULL;
261 data = early_memremap(efi_setup, sizeof(*data));
265 systab64 = early_memremap((unsigned long)phys,
267 if (systab64 == NULL) {
268 pr_err("Couldn't map the system table!\n");
270 early_memunmap(data, sizeof(*data));
274 efi_systab.hdr = systab64->hdr;
275 efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor :
277 tmp |= data ? data->fw_vendor : systab64->fw_vendor;
278 efi_systab.fw_revision = systab64->fw_revision;
279 efi_systab.con_in_handle = systab64->con_in_handle;
280 tmp |= systab64->con_in_handle;
281 efi_systab.con_in = systab64->con_in;
282 tmp |= systab64->con_in;
283 efi_systab.con_out_handle = systab64->con_out_handle;
284 tmp |= systab64->con_out_handle;
285 efi_systab.con_out = systab64->con_out;
286 tmp |= systab64->con_out;
287 efi_systab.stderr_handle = systab64->stderr_handle;
288 tmp |= systab64->stderr_handle;
289 efi_systab.stderr = systab64->stderr;
290 tmp |= systab64->stderr;
291 efi_systab.runtime = data ?
292 (void *)(unsigned long)data->runtime :
293 (void *)(unsigned long)systab64->runtime;
294 tmp |= data ? data->runtime : systab64->runtime;
295 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
296 tmp |= systab64->boottime;
297 efi_systab.nr_tables = systab64->nr_tables;
298 efi_systab.tables = data ? (unsigned long)data->tables :
300 tmp |= data ? data->tables : systab64->tables;
302 early_memunmap(systab64, sizeof(*systab64));
304 early_memunmap(data, sizeof(*data));
307 pr_err("EFI data located above 4GB, disabling EFI.\n");
312 efi_system_table_32_t *systab32;
314 systab32 = early_memremap((unsigned long)phys,
316 if (systab32 == NULL) {
317 pr_err("Couldn't map the system table!\n");
321 efi_systab.hdr = systab32->hdr;
322 efi_systab.fw_vendor = systab32->fw_vendor;
323 efi_systab.fw_revision = systab32->fw_revision;
324 efi_systab.con_in_handle = systab32->con_in_handle;
325 efi_systab.con_in = systab32->con_in;
326 efi_systab.con_out_handle = systab32->con_out_handle;
327 efi_systab.con_out = systab32->con_out;
328 efi_systab.stderr_handle = systab32->stderr_handle;
329 efi_systab.stderr = systab32->stderr;
330 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
331 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
332 efi_systab.nr_tables = systab32->nr_tables;
333 efi_systab.tables = systab32->tables;
335 early_memunmap(systab32, sizeof(*systab32));
338 efi.systab = &efi_systab;
341 * Verify the EFI Table
343 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
344 pr_err("System table signature incorrect!\n");
347 if ((efi.systab->hdr.revision >> 16) == 0)
348 pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n",
349 efi.systab->hdr.revision >> 16,
350 efi.systab->hdr.revision & 0xffff);
352 set_bit(EFI_SYSTEM_TABLES, &efi.flags);
357 static int __init efi_runtime_init32(void)
359 efi_runtime_services_32_t *runtime;
361 runtime = early_memremap((unsigned long)efi.systab->runtime,
362 sizeof(efi_runtime_services_32_t));
364 pr_err("Could not map the runtime service table!\n");
369 * We will only need *early* access to the SetVirtualAddressMap
370 * EFI runtime service. All other runtime services will be called
371 * via the virtual mapping.
373 efi_phys.set_virtual_address_map =
374 (efi_set_virtual_address_map_t *)
375 (unsigned long)runtime->set_virtual_address_map;
376 early_memunmap(runtime, sizeof(efi_runtime_services_32_t));
381 static int __init efi_runtime_init64(void)
383 efi_runtime_services_64_t *runtime;
385 runtime = early_memremap((unsigned long)efi.systab->runtime,
386 sizeof(efi_runtime_services_64_t));
388 pr_err("Could not map the runtime service table!\n");
393 * We will only need *early* access to the SetVirtualAddressMap
394 * EFI runtime service. All other runtime services will be called
395 * via the virtual mapping.
397 efi_phys.set_virtual_address_map =
398 (efi_set_virtual_address_map_t *)
399 (unsigned long)runtime->set_virtual_address_map;
400 early_memunmap(runtime, sizeof(efi_runtime_services_64_t));
405 static int __init efi_runtime_init(void)
410 * Check out the runtime services table. We need to map
411 * the runtime services table so that we can grab the physical
412 * address of several of the EFI runtime functions, needed to
413 * set the firmware into virtual mode.
415 * When EFI_PARAVIRT is in force then we could not map runtime
416 * service memory region because we do not have direct access to it.
417 * However, runtime services are available through proxy functions
418 * (e.g. in case of Xen dom0 EFI implementation they call special
419 * hypercall which executes relevant EFI functions) and that is why
420 * they are always enabled.
423 if (!efi_enabled(EFI_PARAVIRT)) {
424 if (efi_enabled(EFI_64BIT))
425 rv = efi_runtime_init64();
427 rv = efi_runtime_init32();
433 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
438 static int __init efi_memmap_init(void)
440 if (efi_enabled(EFI_PARAVIRT))
443 /* Map the EFI memory map */
444 memmap.map = early_memremap((unsigned long)memmap.phys_map,
445 memmap.nr_map * memmap.desc_size);
446 if (memmap.map == NULL) {
447 pr_err("Could not map the memory map!\n");
450 memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
455 set_bit(EFI_MEMMAP, &efi.flags);
460 void __init efi_init(void)
463 char vendor[100] = "unknown";
468 if (boot_params.efi_info.efi_systab_hi ||
469 boot_params.efi_info.efi_memmap_hi) {
470 pr_info("Table located above 4GB, disabling EFI.\n");
473 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
475 efi_phys.systab = (efi_system_table_t *)
476 (boot_params.efi_info.efi_systab |
477 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
480 if (efi_systab_init(efi_phys.systab))
483 efi.config_table = (unsigned long)efi.systab->tables;
484 efi.fw_vendor = (unsigned long)efi.systab->fw_vendor;
485 efi.runtime = (unsigned long)efi.systab->runtime;
488 * Show what we know for posterity
490 c16 = tmp = early_memremap(efi.systab->fw_vendor, 2);
492 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
496 pr_err("Could not map the firmware vendor!\n");
497 early_memunmap(tmp, 2);
499 pr_info("EFI v%u.%.02u by %s\n",
500 efi.systab->hdr.revision >> 16,
501 efi.systab->hdr.revision & 0xffff, vendor);
503 if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables))
506 if (efi_config_init(arch_tables))
510 * Note: We currently don't support runtime services on an EFI
511 * that doesn't match the kernel 32/64-bit mode.
514 if (!efi_runtime_supported())
515 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
517 if (efi_runtime_disabled() || efi_runtime_init())
520 if (efi_memmap_init())
523 if (efi_enabled(EFI_DBG))
529 void __init efi_late_init(void)
534 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
538 addr = md->virt_addr;
539 npages = md->num_pages;
541 memrange_efi_to_native(&addr, &npages);
544 set_memory_x(addr, npages);
546 set_memory_nx(addr, npages);
549 void __init runtime_code_page_mkexec(void)
551 efi_memory_desc_t *md;
554 /* Make EFI runtime service code area executable */
555 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
558 if (md->type != EFI_RUNTIME_SERVICES_CODE)
561 efi_set_executable(md, true);
565 void __init efi_memory_uc(u64 addr, unsigned long size)
567 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
570 npages = round_up(size, page_shift) / page_shift;
571 memrange_efi_to_native(&addr, &npages);
572 set_memory_uc(addr, npages);
575 void __init old_map_region(efi_memory_desc_t *md)
577 u64 start_pfn, end_pfn, end;
581 start_pfn = PFN_DOWN(md->phys_addr);
582 size = md->num_pages << PAGE_SHIFT;
583 end = md->phys_addr + size;
584 end_pfn = PFN_UP(end);
586 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
587 va = __va(md->phys_addr);
589 if (!(md->attribute & EFI_MEMORY_WB))
590 efi_memory_uc((u64)(unsigned long)va, size);
592 va = efi_ioremap(md->phys_addr, size,
593 md->type, md->attribute);
595 md->virt_addr = (u64) (unsigned long) va;
597 pr_err("ioremap of 0x%llX failed!\n",
598 (unsigned long long)md->phys_addr);
601 /* Merge contiguous regions of the same type and attribute */
602 static void __init efi_merge_regions(void)
605 efi_memory_desc_t *md, *prev_md = NULL;
607 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
616 if (prev_md->type != md->type ||
617 prev_md->attribute != md->attribute) {
622 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
624 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
625 prev_md->num_pages += md->num_pages;
626 md->type = EFI_RESERVED_TYPE;
634 static void __init get_systab_virt_addr(efi_memory_desc_t *md)
639 size = md->num_pages << EFI_PAGE_SHIFT;
640 end = md->phys_addr + size;
641 systab = (u64)(unsigned long)efi_phys.systab;
642 if (md->phys_addr <= systab && systab < end) {
643 systab += md->virt_addr - md->phys_addr;
644 efi.systab = (efi_system_table_t *)(unsigned long)systab;
648 static void __init save_runtime_map(void)
651 efi_memory_desc_t *md;
652 void *tmp, *p, *q = NULL;
655 if (efi_enabled(EFI_OLD_MEMMAP))
658 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
661 if (!(md->attribute & EFI_MEMORY_RUNTIME) ||
662 (md->type == EFI_BOOT_SERVICES_CODE) ||
663 (md->type == EFI_BOOT_SERVICES_DATA))
665 tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL);
670 memcpy(q + count * memmap.desc_size, md, memmap.desc_size);
674 efi_runtime_map_setup(q, count, memmap.desc_size);
679 pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
683 static void *realloc_pages(void *old_memmap, int old_shift)
687 ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
692 * A first-time allocation doesn't have anything to copy.
697 memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
700 free_pages((unsigned long)old_memmap, old_shift);
705 * Map the efi memory ranges of the runtime services and update new_mmap with
708 static void * __init efi_map_regions(int *count, int *pg_shift)
710 void *p, *new_memmap = NULL;
711 unsigned long left = 0;
712 efi_memory_desc_t *md;
714 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
716 if (!(md->attribute & EFI_MEMORY_RUNTIME)) {
718 if (md->type != EFI_BOOT_SERVICES_CODE &&
719 md->type != EFI_BOOT_SERVICES_DATA)
725 get_systab_virt_addr(md);
727 if (left < memmap.desc_size) {
728 new_memmap = realloc_pages(new_memmap, *pg_shift);
732 left += PAGE_SIZE << *pg_shift;
736 memcpy(new_memmap + (*count * memmap.desc_size), md,
739 left -= memmap.desc_size;
746 static void __init kexec_enter_virtual_mode(void)
749 efi_memory_desc_t *md;
755 * We don't do virtual mode, since we don't do runtime services, on
758 if (!efi_is_native()) {
760 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
765 * Map efi regions which were passed via setup_data. The virt_addr is a
766 * fixed addr which was used in first kernel of a kexec boot.
768 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
770 efi_map_region_fixed(md); /* FIXME: add error handling */
771 get_systab_virt_addr(md);
778 efi_sync_low_kernel_mappings();
781 * Now that EFI is in virtual mode, update the function
782 * pointers in the runtime service table to the new virtual addresses.
784 * Call EFI services through wrapper functions.
786 efi.runtime_version = efi_systab.hdr.revision;
788 efi_native_runtime_setup();
790 efi.set_virtual_address_map = NULL;
792 if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
793 runtime_code_page_mkexec();
795 /* clean DUMMY object */
796 efi_delete_dummy_variable();
801 * This function will switch the EFI runtime services to virtual mode.
802 * Essentially, we look through the EFI memmap and map every region that
803 * has the runtime attribute bit set in its memory descriptor into the
804 * ->trampoline_pgd page table using a top-down VA allocation scheme.
806 * The old method which used to update that memory descriptor with the
807 * virtual address obtained from ioremap() is still supported when the
808 * kernel is booted with efi=old_map on its command line. Same old
809 * method enabled the runtime services to be called without having to
810 * thunk back into physical mode for every invocation.
812 * The new method does a pagetable switch in a preemption-safe manner
813 * so that we're in a different address space when calling a runtime
814 * function. For function arguments passing we do copy the PGDs of the
815 * kernel page table into ->trampoline_pgd prior to each call.
817 * Specially for kexec boot, efi runtime maps in previous kernel should
818 * be passed in via setup_data. In that case runtime ranges will be mapped
819 * to the same virtual addresses as the first kernel, see
820 * kexec_enter_virtual_mode().
822 static void __init __efi_enter_virtual_mode(void)
824 int count = 0, pg_shift = 0;
825 void *new_memmap = NULL;
831 new_memmap = efi_map_regions(&count, &pg_shift);
833 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
834 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
842 if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) {
843 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
847 efi_sync_low_kernel_mappings();
848 efi_dump_pagetable();
850 if (efi_is_native()) {
851 status = phys_efi_set_virtual_address_map(
852 memmap.desc_size * count,
855 (efi_memory_desc_t *)__pa(new_memmap));
857 status = efi_thunk_set_virtual_address_map(
858 efi_phys.set_virtual_address_map,
859 memmap.desc_size * count,
862 (efi_memory_desc_t *)__pa(new_memmap));
865 if (status != EFI_SUCCESS) {
866 pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
868 panic("EFI call to SetVirtualAddressMap() failed!");
872 * Now that EFI is in virtual mode, update the function
873 * pointers in the runtime service table to the new virtual addresses.
875 * Call EFI services through wrapper functions.
877 efi.runtime_version = efi_systab.hdr.revision;
880 efi_native_runtime_setup();
882 efi_thunk_runtime_setup();
884 efi.set_virtual_address_map = NULL;
886 efi_runtime_mkexec();
889 * We mapped the descriptor array into the EFI pagetable above but we're
890 * not unmapping it here. Here's why:
892 * We're copying select PGDs from the kernel page table to the EFI page
893 * table and when we do so and make changes to those PGDs like unmapping
894 * stuff from them, those changes appear in the kernel page table and we
897 * From setup_real_mode():
900 * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd;
902 * In this particular case, our allocation is in PGD 0 of the EFI page
903 * table but we've copied that PGD from PGD[272] of the EFI page table:
905 * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272
907 * where the direct memory mapping in kernel space is.
909 * new_memmap's VA comes from that direct mapping and thus clearing it,
910 * it would get cleared in the kernel page table too.
912 * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift);
914 free_pages((unsigned long)new_memmap, pg_shift);
916 /* clean DUMMY object */
917 efi_delete_dummy_variable();
920 void __init efi_enter_virtual_mode(void)
922 if (efi_enabled(EFI_PARAVIRT))
926 kexec_enter_virtual_mode();
928 __efi_enter_virtual_mode();
932 * Convenience functions to obtain memory types and attributes
934 u32 efi_mem_type(unsigned long phys_addr)
936 efi_memory_desc_t *md;
939 if (!efi_enabled(EFI_MEMMAP))
942 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
944 if ((md->phys_addr <= phys_addr) &&
945 (phys_addr < (md->phys_addr +
946 (md->num_pages << EFI_PAGE_SHIFT))))
952 u64 efi_mem_attributes(unsigned long phys_addr)
954 efi_memory_desc_t *md;
957 if (!efi_enabled(EFI_MEMMAP))
960 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
962 if ((md->phys_addr <= phys_addr) &&
963 (phys_addr < (md->phys_addr +
964 (md->num_pages << EFI_PAGE_SHIFT))))
965 return md->attribute;
970 static int __init arch_parse_efi_cmdline(char *str)
972 if (parse_option_str(str, "old_map"))
973 set_bit(EFI_OLD_MEMMAP, &efi.flags);
974 if (parse_option_str(str, "debug"))
975 set_bit(EFI_DBG, &efi.flags);
979 early_param("efi", arch_parse_efi_cmdline);