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>
54 #include <asm/uv/uv.h>
56 static struct efi efi_phys __initdata;
57 static efi_system_table_t efi_systab __initdata;
59 static efi_config_table_type_t arch_tables[] __initdata = {
61 {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab},
63 {NULL_GUID, NULL, NULL},
66 u64 efi_setup; /* efi setup_data physical address */
68 static int add_efi_memmap __initdata;
69 static int __init setup_add_efi_memmap(char *arg)
74 early_param("add_efi_memmap", setup_add_efi_memmap);
76 static efi_status_t __init phys_efi_set_virtual_address_map(
77 unsigned long memory_map_size,
78 unsigned long descriptor_size,
79 u32 descriptor_version,
80 efi_memory_desc_t *virtual_map)
86 save_pgd = efi_call_phys_prolog();
88 /* Disable interrupts around EFI calls: */
89 local_irq_save(flags);
90 status = efi_call_phys(efi_phys.set_virtual_address_map,
91 memory_map_size, descriptor_size,
92 descriptor_version, virtual_map);
93 local_irq_restore(flags);
95 efi_call_phys_epilog(save_pgd);
100 void __init efi_find_mirror(void)
102 efi_memory_desc_t *md;
103 u64 mirror_size = 0, total_size = 0;
105 for_each_efi_memory_desc(md) {
106 unsigned long long start = md->phys_addr;
107 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
110 if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
111 memblock_mark_mirror(start, size);
116 pr_info("Memory: %lldM/%lldM mirrored memory\n",
117 mirror_size>>20, total_size>>20);
121 * Tell the kernel about the EFI memory map. This might include
122 * more than the max 128 entries that can fit in the e820 legacy
123 * (zeropage) memory map.
126 static void __init do_add_efi_memmap(void)
128 efi_memory_desc_t *md;
130 for_each_efi_memory_desc(md) {
131 unsigned long long start = md->phys_addr;
132 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
136 case EFI_LOADER_CODE:
137 case EFI_LOADER_DATA:
138 case EFI_BOOT_SERVICES_CODE:
139 case EFI_BOOT_SERVICES_DATA:
140 case EFI_CONVENTIONAL_MEMORY:
141 if (md->attribute & EFI_MEMORY_WB)
142 e820_type = E820_RAM;
144 e820_type = E820_RESERVED;
146 case EFI_ACPI_RECLAIM_MEMORY:
147 e820_type = E820_ACPI;
149 case EFI_ACPI_MEMORY_NVS:
150 e820_type = E820_NVS;
152 case EFI_UNUSABLE_MEMORY:
153 e820_type = E820_UNUSABLE;
155 case EFI_PERSISTENT_MEMORY:
156 e820_type = E820_PMEM;
160 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
161 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
162 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
164 e820_type = E820_RESERVED;
167 e820_add_region(start, size, e820_type);
169 sanitize_e820_map(e820->map, ARRAY_SIZE(e820->map), &e820->nr_map);
172 int __init efi_memblock_x86_reserve_range(void)
174 struct efi_info *e = &boot_params.efi_info;
177 if (efi_enabled(EFI_PARAVIRT))
181 /* Can't handle data above 4GB at this time */
182 if (e->efi_memmap_hi) {
183 pr_err("Memory map is above 4GB, disabling EFI.\n");
186 pmap = e->efi_memmap;
188 pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
190 efi.memmap.phys_map = pmap;
191 efi.memmap.nr_map = e->efi_memmap_size /
193 efi.memmap.desc_size = e->efi_memdesc_size;
194 efi.memmap.desc_version = e->efi_memdesc_version;
196 WARN(efi.memmap.desc_version != 1,
197 "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
198 efi.memmap.desc_version);
200 memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size);
205 void __init efi_print_memmap(void)
207 efi_memory_desc_t *md;
210 for_each_efi_memory_desc(md) {
213 pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n",
214 i++, efi_md_typeattr_format(buf, sizeof(buf), md),
216 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1,
217 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
221 void __init efi_unmap_memmap(void)
225 clear_bit(EFI_MEMMAP, &efi.flags);
227 size = efi.memmap.nr_map * efi.memmap.desc_size;
228 if (efi.memmap.map) {
229 early_memunmap(efi.memmap.map, size);
230 efi.memmap.map = NULL;
234 static int __init efi_systab_init(void *phys)
236 if (efi_enabled(EFI_64BIT)) {
237 efi_system_table_64_t *systab64;
238 struct efi_setup_data *data = NULL;
242 data = early_memremap(efi_setup, sizeof(*data));
246 systab64 = early_memremap((unsigned long)phys,
248 if (systab64 == NULL) {
249 pr_err("Couldn't map the system table!\n");
251 early_memunmap(data, sizeof(*data));
255 efi_systab.hdr = systab64->hdr;
256 efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor :
258 tmp |= data ? data->fw_vendor : systab64->fw_vendor;
259 efi_systab.fw_revision = systab64->fw_revision;
260 efi_systab.con_in_handle = systab64->con_in_handle;
261 tmp |= systab64->con_in_handle;
262 efi_systab.con_in = systab64->con_in;
263 tmp |= systab64->con_in;
264 efi_systab.con_out_handle = systab64->con_out_handle;
265 tmp |= systab64->con_out_handle;
266 efi_systab.con_out = systab64->con_out;
267 tmp |= systab64->con_out;
268 efi_systab.stderr_handle = systab64->stderr_handle;
269 tmp |= systab64->stderr_handle;
270 efi_systab.stderr = systab64->stderr;
271 tmp |= systab64->stderr;
272 efi_systab.runtime = data ?
273 (void *)(unsigned long)data->runtime :
274 (void *)(unsigned long)systab64->runtime;
275 tmp |= data ? data->runtime : systab64->runtime;
276 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
277 tmp |= systab64->boottime;
278 efi_systab.nr_tables = systab64->nr_tables;
279 efi_systab.tables = data ? (unsigned long)data->tables :
281 tmp |= data ? data->tables : systab64->tables;
283 early_memunmap(systab64, sizeof(*systab64));
285 early_memunmap(data, sizeof(*data));
288 pr_err("EFI data located above 4GB, disabling EFI.\n");
293 efi_system_table_32_t *systab32;
295 systab32 = early_memremap((unsigned long)phys,
297 if (systab32 == NULL) {
298 pr_err("Couldn't map the system table!\n");
302 efi_systab.hdr = systab32->hdr;
303 efi_systab.fw_vendor = systab32->fw_vendor;
304 efi_systab.fw_revision = systab32->fw_revision;
305 efi_systab.con_in_handle = systab32->con_in_handle;
306 efi_systab.con_in = systab32->con_in;
307 efi_systab.con_out_handle = systab32->con_out_handle;
308 efi_systab.con_out = systab32->con_out;
309 efi_systab.stderr_handle = systab32->stderr_handle;
310 efi_systab.stderr = systab32->stderr;
311 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
312 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
313 efi_systab.nr_tables = systab32->nr_tables;
314 efi_systab.tables = systab32->tables;
316 early_memunmap(systab32, sizeof(*systab32));
319 efi.systab = &efi_systab;
322 * Verify the EFI Table
324 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
325 pr_err("System table signature incorrect!\n");
328 if ((efi.systab->hdr.revision >> 16) == 0)
329 pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n",
330 efi.systab->hdr.revision >> 16,
331 efi.systab->hdr.revision & 0xffff);
336 static int __init efi_runtime_init32(void)
338 efi_runtime_services_32_t *runtime;
340 runtime = early_memremap((unsigned long)efi.systab->runtime,
341 sizeof(efi_runtime_services_32_t));
343 pr_err("Could not map the runtime service table!\n");
348 * We will only need *early* access to the SetVirtualAddressMap
349 * EFI runtime service. All other runtime services will be called
350 * via the virtual mapping.
352 efi_phys.set_virtual_address_map =
353 (efi_set_virtual_address_map_t *)
354 (unsigned long)runtime->set_virtual_address_map;
355 early_memunmap(runtime, sizeof(efi_runtime_services_32_t));
360 static int __init efi_runtime_init64(void)
362 efi_runtime_services_64_t *runtime;
364 runtime = early_memremap((unsigned long)efi.systab->runtime,
365 sizeof(efi_runtime_services_64_t));
367 pr_err("Could not map the runtime service table!\n");
372 * We will only need *early* access to the SetVirtualAddressMap
373 * EFI runtime service. All other runtime services will be called
374 * via the virtual mapping.
376 efi_phys.set_virtual_address_map =
377 (efi_set_virtual_address_map_t *)
378 (unsigned long)runtime->set_virtual_address_map;
379 early_memunmap(runtime, sizeof(efi_runtime_services_64_t));
384 static int __init efi_runtime_init(void)
389 * Check out the runtime services table. We need to map
390 * the runtime services table so that we can grab the physical
391 * address of several of the EFI runtime functions, needed to
392 * set the firmware into virtual mode.
394 * When EFI_PARAVIRT is in force then we could not map runtime
395 * service memory region because we do not have direct access to it.
396 * However, runtime services are available through proxy functions
397 * (e.g. in case of Xen dom0 EFI implementation they call special
398 * hypercall which executes relevant EFI functions) and that is why
399 * they are always enabled.
402 if (!efi_enabled(EFI_PARAVIRT)) {
403 if (efi_enabled(EFI_64BIT))
404 rv = efi_runtime_init64();
406 rv = efi_runtime_init32();
412 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
417 static int __init efi_memmap_init(void)
419 unsigned long addr, size;
421 if (efi_enabled(EFI_PARAVIRT))
424 /* Map the EFI memory map */
425 size = efi.memmap.nr_map * efi.memmap.desc_size;
426 addr = (unsigned long)efi.memmap.phys_map;
428 efi.memmap.map = early_memremap(addr, size);
429 if (efi.memmap.map == NULL) {
430 pr_err("Could not map the memory map!\n");
434 efi.memmap.map_end = efi.memmap.map + size;
439 set_bit(EFI_MEMMAP, &efi.flags);
444 void __init efi_init(void)
447 char vendor[100] = "unknown";
452 if (boot_params.efi_info.efi_systab_hi ||
453 boot_params.efi_info.efi_memmap_hi) {
454 pr_info("Table located above 4GB, disabling EFI.\n");
457 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
459 efi_phys.systab = (efi_system_table_t *)
460 (boot_params.efi_info.efi_systab |
461 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
464 if (efi_systab_init(efi_phys.systab))
467 efi.config_table = (unsigned long)efi.systab->tables;
468 efi.fw_vendor = (unsigned long)efi.systab->fw_vendor;
469 efi.runtime = (unsigned long)efi.systab->runtime;
472 * Show what we know for posterity
474 c16 = tmp = early_memremap(efi.systab->fw_vendor, 2);
476 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
480 pr_err("Could not map the firmware vendor!\n");
481 early_memunmap(tmp, 2);
483 pr_info("EFI v%u.%.02u by %s\n",
484 efi.systab->hdr.revision >> 16,
485 efi.systab->hdr.revision & 0xffff, vendor);
487 if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables))
490 if (efi_config_init(arch_tables))
494 * Note: We currently don't support runtime services on an EFI
495 * that doesn't match the kernel 32/64-bit mode.
498 if (!efi_runtime_supported())
499 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
501 if (efi_runtime_disabled() || efi_runtime_init())
504 if (efi_memmap_init())
507 if (efi_enabled(EFI_DBG))
513 void __init efi_late_init(void)
518 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
522 addr = md->virt_addr;
523 npages = md->num_pages;
525 memrange_efi_to_native(&addr, &npages);
528 set_memory_x(addr, npages);
530 set_memory_nx(addr, npages);
533 void __init runtime_code_page_mkexec(void)
535 efi_memory_desc_t *md;
537 /* Make EFI runtime service code area executable */
538 for_each_efi_memory_desc(md) {
539 if (md->type != EFI_RUNTIME_SERVICES_CODE)
542 efi_set_executable(md, true);
546 void __init efi_memory_uc(u64 addr, unsigned long size)
548 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
551 npages = round_up(size, page_shift) / page_shift;
552 memrange_efi_to_native(&addr, &npages);
553 set_memory_uc(addr, npages);
556 void __init old_map_region(efi_memory_desc_t *md)
558 u64 start_pfn, end_pfn, end;
562 start_pfn = PFN_DOWN(md->phys_addr);
563 size = md->num_pages << PAGE_SHIFT;
564 end = md->phys_addr + size;
565 end_pfn = PFN_UP(end);
567 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
568 va = __va(md->phys_addr);
570 if (!(md->attribute & EFI_MEMORY_WB))
571 efi_memory_uc((u64)(unsigned long)va, size);
573 va = efi_ioremap(md->phys_addr, size,
574 md->type, md->attribute);
576 md->virt_addr = (u64) (unsigned long) va;
578 pr_err("ioremap of 0x%llX failed!\n",
579 (unsigned long long)md->phys_addr);
582 /* Merge contiguous regions of the same type and attribute */
583 static void __init efi_merge_regions(void)
585 efi_memory_desc_t *md, *prev_md = NULL;
587 for_each_efi_memory_desc(md) {
595 if (prev_md->type != md->type ||
596 prev_md->attribute != md->attribute) {
601 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
603 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
604 prev_md->num_pages += md->num_pages;
605 md->type = EFI_RESERVED_TYPE;
613 static void __init get_systab_virt_addr(efi_memory_desc_t *md)
618 size = md->num_pages << EFI_PAGE_SHIFT;
619 end = md->phys_addr + size;
620 systab = (u64)(unsigned long)efi_phys.systab;
621 if (md->phys_addr <= systab && systab < end) {
622 systab += md->virt_addr - md->phys_addr;
623 efi.systab = (efi_system_table_t *)(unsigned long)systab;
627 static void __init save_runtime_map(void)
629 #ifdef CONFIG_KEXEC_CORE
630 unsigned long desc_size;
631 efi_memory_desc_t *md;
632 void *tmp, *q = NULL;
635 if (efi_enabled(EFI_OLD_MEMMAP))
638 desc_size = efi.memmap.desc_size;
640 for_each_efi_memory_desc(md) {
641 if (!(md->attribute & EFI_MEMORY_RUNTIME) ||
642 (md->type == EFI_BOOT_SERVICES_CODE) ||
643 (md->type == EFI_BOOT_SERVICES_DATA))
645 tmp = krealloc(q, (count + 1) * desc_size, GFP_KERNEL);
650 memcpy(q + count * desc_size, md, desc_size);
654 efi_runtime_map_setup(q, count, desc_size);
659 pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
663 static void *realloc_pages(void *old_memmap, int old_shift)
667 ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
672 * A first-time allocation doesn't have anything to copy.
677 memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
680 free_pages((unsigned long)old_memmap, old_shift);
685 * Iterate the EFI memory map in reverse order because the regions
686 * will be mapped top-down. The end result is the same as if we had
687 * mapped things forward, but doesn't require us to change the
688 * existing implementation of efi_map_region().
690 static inline void *efi_map_next_entry_reverse(void *entry)
694 return efi.memmap.map_end - efi.memmap.desc_size;
696 entry -= efi.memmap.desc_size;
697 if (entry < efi.memmap.map)
704 * efi_map_next_entry - Return the next EFI memory map descriptor
705 * @entry: Previous EFI memory map descriptor
707 * This is a helper function to iterate over the EFI memory map, which
708 * we do in different orders depending on the current configuration.
710 * To begin traversing the memory map @entry must be %NULL.
712 * Returns %NULL when we reach the end of the memory map.
714 static void *efi_map_next_entry(void *entry)
716 if (!efi_enabled(EFI_OLD_MEMMAP) && efi_enabled(EFI_64BIT)) {
718 * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE
719 * config table feature requires us to map all entries
720 * in the same order as they appear in the EFI memory
721 * map. That is to say, entry N must have a lower
722 * virtual address than entry N+1. This is because the
723 * firmware toolchain leaves relative references in
724 * the code/data sections, which are split and become
725 * separate EFI memory regions. Mapping things
726 * out-of-order leads to the firmware accessing
727 * unmapped addresses.
729 * Since we need to map things this way whether or not
730 * the kernel actually makes use of
731 * EFI_PROPERTIES_TABLE, let's just switch to this
732 * scheme by default for 64-bit.
734 return efi_map_next_entry_reverse(entry);
739 return efi.memmap.map;
741 entry += efi.memmap.desc_size;
742 if (entry >= efi.memmap.map_end)
749 * Map the efi memory ranges of the runtime services and update new_mmap with
752 static void * __init efi_map_regions(int *count, int *pg_shift)
754 void *p, *new_memmap = NULL;
755 unsigned long left = 0;
756 unsigned long desc_size;
757 efi_memory_desc_t *md;
759 desc_size = efi.memmap.desc_size;
762 while ((p = efi_map_next_entry(p))) {
764 if (!(md->attribute & EFI_MEMORY_RUNTIME)) {
766 if (md->type != EFI_BOOT_SERVICES_CODE &&
767 md->type != EFI_BOOT_SERVICES_DATA)
773 get_systab_virt_addr(md);
775 if (left < desc_size) {
776 new_memmap = realloc_pages(new_memmap, *pg_shift);
780 left += PAGE_SIZE << *pg_shift;
784 memcpy(new_memmap + (*count * desc_size), md, desc_size);
793 static void __init kexec_enter_virtual_mode(void)
795 #ifdef CONFIG_KEXEC_CORE
796 efi_memory_desc_t *md;
797 unsigned int num_pages;
802 * We don't do virtual mode, since we don't do runtime services, on
805 if (!efi_is_native()) {
807 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
811 if (efi_alloc_page_tables()) {
812 pr_err("Failed to allocate EFI page tables\n");
813 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
818 * Map efi regions which were passed via setup_data. The virt_addr is a
819 * fixed addr which was used in first kernel of a kexec boot.
821 for_each_efi_memory_desc(md) {
822 efi_map_region_fixed(md); /* FIXME: add error handling */
823 get_systab_virt_addr(md);
830 num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE);
831 num_pages >>= PAGE_SHIFT;
833 if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) {
834 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
838 efi_sync_low_kernel_mappings();
841 * Now that EFI is in virtual mode, update the function
842 * pointers in the runtime service table to the new virtual addresses.
844 * Call EFI services through wrapper functions.
846 efi.runtime_version = efi_systab.hdr.revision;
848 efi_native_runtime_setup();
850 efi.set_virtual_address_map = NULL;
852 if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
853 runtime_code_page_mkexec();
855 /* clean DUMMY object */
856 efi_delete_dummy_variable();
861 * This function will switch the EFI runtime services to virtual mode.
862 * Essentially, we look through the EFI memmap and map every region that
863 * has the runtime attribute bit set in its memory descriptor into the
864 * efi_pgd page table.
866 * The old method which used to update that memory descriptor with the
867 * virtual address obtained from ioremap() is still supported when the
868 * kernel is booted with efi=old_map on its command line. Same old
869 * method enabled the runtime services to be called without having to
870 * thunk back into physical mode for every invocation.
872 * The new method does a pagetable switch in a preemption-safe manner
873 * so that we're in a different address space when calling a runtime
874 * function. For function arguments passing we do copy the PUDs of the
875 * kernel page table into efi_pgd prior to each call.
877 * Specially for kexec boot, efi runtime maps in previous kernel should
878 * be passed in via setup_data. In that case runtime ranges will be mapped
879 * to the same virtual addresses as the first kernel, see
880 * kexec_enter_virtual_mode().
882 static void __init __efi_enter_virtual_mode(void)
884 int count = 0, pg_shift = 0;
885 void *new_memmap = NULL;
890 if (efi_alloc_page_tables()) {
891 pr_err("Failed to allocate EFI page tables\n");
892 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
897 new_memmap = efi_map_regions(&count, &pg_shift);
899 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
900 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
908 if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) {
909 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
913 efi_sync_low_kernel_mappings();
915 if (efi_is_native()) {
916 status = phys_efi_set_virtual_address_map(
917 efi.memmap.desc_size * count,
918 efi.memmap.desc_size,
919 efi.memmap.desc_version,
920 (efi_memory_desc_t *)__pa(new_memmap));
922 status = efi_thunk_set_virtual_address_map(
923 efi_phys.set_virtual_address_map,
924 efi.memmap.desc_size * count,
925 efi.memmap.desc_size,
926 efi.memmap.desc_version,
927 (efi_memory_desc_t *)__pa(new_memmap));
930 if (status != EFI_SUCCESS) {
931 pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
933 panic("EFI call to SetVirtualAddressMap() failed!");
937 * Now that EFI is in virtual mode, update the function
938 * pointers in the runtime service table to the new virtual addresses.
940 * Call EFI services through wrapper functions.
942 efi.runtime_version = efi_systab.hdr.revision;
945 efi_native_runtime_setup();
947 efi_thunk_runtime_setup();
949 efi.set_virtual_address_map = NULL;
952 * Apply more restrictive page table mapping attributes now that
953 * SVAM() has been called and the firmware has performed all
954 * necessary relocation fixups for the new virtual addresses.
956 efi_runtime_update_mappings();
957 efi_dump_pagetable();
960 * We mapped the descriptor array into the EFI pagetable above
961 * but we're not unmapping it here because if we're running in
962 * EFI mixed mode we need all of memory to be accessible when
963 * we pass parameters to the EFI runtime services in the
966 free_pages((unsigned long)new_memmap, pg_shift);
968 /* clean DUMMY object */
969 efi_delete_dummy_variable();
972 void __init efi_enter_virtual_mode(void)
974 if (efi_enabled(EFI_PARAVIRT))
978 kexec_enter_virtual_mode();
980 __efi_enter_virtual_mode();
984 * Convenience functions to obtain memory types and attributes
986 u32 efi_mem_type(unsigned long phys_addr)
988 efi_memory_desc_t *md;
990 if (!efi_enabled(EFI_MEMMAP))
993 for_each_efi_memory_desc(md) {
994 if ((md->phys_addr <= phys_addr) &&
995 (phys_addr < (md->phys_addr +
996 (md->num_pages << EFI_PAGE_SHIFT))))
1002 static int __init arch_parse_efi_cmdline(char *str)
1005 pr_warn("need at least one option\n");
1009 if (parse_option_str(str, "old_map"))
1010 set_bit(EFI_OLD_MEMMAP, &efi.flags);
1014 early_param("efi", arch_parse_efi_cmdline);