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>
57 static struct efi efi_phys __initdata;
58 static efi_system_table_t efi_systab __initdata;
60 static efi_config_table_type_t arch_tables[] __initdata = {
62 {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab},
64 {NULL_GUID, NULL, NULL},
67 u64 efi_setup; /* efi setup_data physical address */
69 static int add_efi_memmap __initdata;
70 static int __init setup_add_efi_memmap(char *arg)
75 early_param("add_efi_memmap", setup_add_efi_memmap);
77 static efi_status_t __init phys_efi_set_virtual_address_map(
78 unsigned long memory_map_size,
79 unsigned long descriptor_size,
80 u32 descriptor_version,
81 efi_memory_desc_t *virtual_map)
87 save_pgd = efi_call_phys_prolog();
89 /* Disable interrupts around EFI calls: */
90 local_irq_save(flags);
91 status = efi_call_phys(efi_phys.set_virtual_address_map,
92 memory_map_size, descriptor_size,
93 descriptor_version, virtual_map);
94 local_irq_restore(flags);
96 efi_call_phys_epilog(save_pgd);
101 void __init efi_find_mirror(void)
103 efi_memory_desc_t *md;
104 u64 mirror_size = 0, total_size = 0;
106 for_each_efi_memory_desc(md) {
107 unsigned long long start = md->phys_addr;
108 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
111 if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
112 memblock_mark_mirror(start, size);
117 pr_info("Memory: %lldM/%lldM mirrored memory\n",
118 mirror_size>>20, total_size>>20);
122 * Tell the kernel about the EFI memory map. This might include
123 * more than the max 128 entries that can fit in the e820 legacy
124 * (zeropage) memory map.
127 static void __init do_add_efi_memmap(void)
129 efi_memory_desc_t *md;
131 for_each_efi_memory_desc(md) {
132 unsigned long long start = md->phys_addr;
133 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
137 case EFI_LOADER_CODE:
138 case EFI_LOADER_DATA:
139 case EFI_BOOT_SERVICES_CODE:
140 case EFI_BOOT_SERVICES_DATA:
141 case EFI_CONVENTIONAL_MEMORY:
142 if (md->attribute & EFI_MEMORY_WB)
143 e820_type = E820_RAM;
145 e820_type = E820_RESERVED;
147 case EFI_ACPI_RECLAIM_MEMORY:
148 e820_type = E820_ACPI;
150 case EFI_ACPI_MEMORY_NVS:
151 e820_type = E820_NVS;
153 case EFI_UNUSABLE_MEMORY:
154 e820_type = E820_UNUSABLE;
156 case EFI_PERSISTENT_MEMORY:
157 e820_type = E820_PMEM;
161 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
162 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
163 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
165 e820_type = E820_RESERVED;
168 e820_add_region(start, size, e820_type);
170 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
173 int __init efi_memblock_x86_reserve_range(void)
175 struct efi_info *e = &boot_params.efi_info;
178 if (efi_enabled(EFI_PARAVIRT))
182 /* Can't handle data above 4GB at this time */
183 if (e->efi_memmap_hi) {
184 pr_err("Memory map is above 4GB, disabling EFI.\n");
187 pmap = e->efi_memmap;
189 pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
191 efi.memmap.phys_map = pmap;
192 efi.memmap.nr_map = e->efi_memmap_size /
194 efi.memmap.desc_size = e->efi_memdesc_size;
195 efi.memmap.desc_version = e->efi_memdesc_version;
197 WARN(efi.memmap.desc_version != 1,
198 "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
199 efi.memmap.desc_version);
201 memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size);
206 void __init efi_print_memmap(void)
208 efi_memory_desc_t *md;
211 for_each_efi_memory_desc(md) {
214 pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n",
215 i++, efi_md_typeattr_format(buf, sizeof(buf), md),
217 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1,
218 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
222 void __init efi_unmap_memmap(void)
226 clear_bit(EFI_MEMMAP, &efi.flags);
228 size = efi.memmap.nr_map * efi.memmap.desc_size;
229 if (efi.memmap.map) {
230 early_memunmap(efi.memmap.map, size);
231 efi.memmap.map = NULL;
235 static int __init efi_systab_init(void *phys)
237 if (efi_enabled(EFI_64BIT)) {
238 efi_system_table_64_t *systab64;
239 struct efi_setup_data *data = NULL;
243 data = early_memremap(efi_setup, sizeof(*data));
247 systab64 = early_memremap((unsigned long)phys,
249 if (systab64 == NULL) {
250 pr_err("Couldn't map the system table!\n");
252 early_memunmap(data, sizeof(*data));
256 efi_systab.hdr = systab64->hdr;
257 efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor :
259 tmp |= data ? data->fw_vendor : systab64->fw_vendor;
260 efi_systab.fw_revision = systab64->fw_revision;
261 efi_systab.con_in_handle = systab64->con_in_handle;
262 tmp |= systab64->con_in_handle;
263 efi_systab.con_in = systab64->con_in;
264 tmp |= systab64->con_in;
265 efi_systab.con_out_handle = systab64->con_out_handle;
266 tmp |= systab64->con_out_handle;
267 efi_systab.con_out = systab64->con_out;
268 tmp |= systab64->con_out;
269 efi_systab.stderr_handle = systab64->stderr_handle;
270 tmp |= systab64->stderr_handle;
271 efi_systab.stderr = systab64->stderr;
272 tmp |= systab64->stderr;
273 efi_systab.runtime = data ?
274 (void *)(unsigned long)data->runtime :
275 (void *)(unsigned long)systab64->runtime;
276 tmp |= data ? data->runtime : systab64->runtime;
277 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
278 tmp |= systab64->boottime;
279 efi_systab.nr_tables = systab64->nr_tables;
280 efi_systab.tables = data ? (unsigned long)data->tables :
282 tmp |= data ? data->tables : systab64->tables;
284 early_memunmap(systab64, sizeof(*systab64));
286 early_memunmap(data, sizeof(*data));
289 pr_err("EFI data located above 4GB, disabling EFI.\n");
294 efi_system_table_32_t *systab32;
296 systab32 = early_memremap((unsigned long)phys,
298 if (systab32 == NULL) {
299 pr_err("Couldn't map the system table!\n");
303 efi_systab.hdr = systab32->hdr;
304 efi_systab.fw_vendor = systab32->fw_vendor;
305 efi_systab.fw_revision = systab32->fw_revision;
306 efi_systab.con_in_handle = systab32->con_in_handle;
307 efi_systab.con_in = systab32->con_in;
308 efi_systab.con_out_handle = systab32->con_out_handle;
309 efi_systab.con_out = systab32->con_out;
310 efi_systab.stderr_handle = systab32->stderr_handle;
311 efi_systab.stderr = systab32->stderr;
312 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
313 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
314 efi_systab.nr_tables = systab32->nr_tables;
315 efi_systab.tables = systab32->tables;
317 early_memunmap(systab32, sizeof(*systab32));
320 efi.systab = &efi_systab;
323 * Verify the EFI Table
325 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
326 pr_err("System table signature incorrect!\n");
329 if ((efi.systab->hdr.revision >> 16) == 0)
330 pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n",
331 efi.systab->hdr.revision >> 16,
332 efi.systab->hdr.revision & 0xffff);
337 static int __init efi_runtime_init32(void)
339 efi_runtime_services_32_t *runtime;
341 runtime = early_memremap((unsigned long)efi.systab->runtime,
342 sizeof(efi_runtime_services_32_t));
344 pr_err("Could not map the runtime service table!\n");
349 * We will only need *early* access to the SetVirtualAddressMap
350 * EFI runtime service. All other runtime services will be called
351 * via the virtual mapping.
353 efi_phys.set_virtual_address_map =
354 (efi_set_virtual_address_map_t *)
355 (unsigned long)runtime->set_virtual_address_map;
356 early_memunmap(runtime, sizeof(efi_runtime_services_32_t));
361 static int __init efi_runtime_init64(void)
363 efi_runtime_services_64_t *runtime;
365 runtime = early_memremap((unsigned long)efi.systab->runtime,
366 sizeof(efi_runtime_services_64_t));
368 pr_err("Could not map the runtime service table!\n");
373 * We will only need *early* access to the SetVirtualAddressMap
374 * EFI runtime service. All other runtime services will be called
375 * via the virtual mapping.
377 efi_phys.set_virtual_address_map =
378 (efi_set_virtual_address_map_t *)
379 (unsigned long)runtime->set_virtual_address_map;
380 early_memunmap(runtime, sizeof(efi_runtime_services_64_t));
385 static int __init efi_runtime_init(void)
390 * Check out the runtime services table. We need to map
391 * the runtime services table so that we can grab the physical
392 * address of several of the EFI runtime functions, needed to
393 * set the firmware into virtual mode.
395 * When EFI_PARAVIRT is in force then we could not map runtime
396 * service memory region because we do not have direct access to it.
397 * However, runtime services are available through proxy functions
398 * (e.g. in case of Xen dom0 EFI implementation they call special
399 * hypercall which executes relevant EFI functions) and that is why
400 * they are always enabled.
403 if (!efi_enabled(EFI_PARAVIRT)) {
404 if (efi_enabled(EFI_64BIT))
405 rv = efi_runtime_init64();
407 rv = efi_runtime_init32();
413 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
418 static int __init efi_memmap_init(void)
420 unsigned long addr, size;
422 if (efi_enabled(EFI_PARAVIRT))
425 /* Map the EFI memory map */
426 size = efi.memmap.nr_map * efi.memmap.desc_size;
427 addr = (unsigned long)efi.memmap.phys_map;
429 efi.memmap.map = early_memremap(addr, size);
430 if (efi.memmap.map == NULL) {
431 pr_err("Could not map the memory map!\n");
435 efi.memmap.map_end = efi.memmap.map + size;
440 set_bit(EFI_MEMMAP, &efi.flags);
445 void __init efi_init(void)
448 char vendor[100] = "unknown";
453 if (boot_params.efi_info.efi_systab_hi ||
454 boot_params.efi_info.efi_memmap_hi) {
455 pr_info("Table located above 4GB, disabling EFI.\n");
458 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
460 efi_phys.systab = (efi_system_table_t *)
461 (boot_params.efi_info.efi_systab |
462 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
465 if (efi_systab_init(efi_phys.systab))
468 efi.config_table = (unsigned long)efi.systab->tables;
469 efi.fw_vendor = (unsigned long)efi.systab->fw_vendor;
470 efi.runtime = (unsigned long)efi.systab->runtime;
473 * Show what we know for posterity
475 c16 = tmp = early_memremap(efi.systab->fw_vendor, 2);
477 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
481 pr_err("Could not map the firmware vendor!\n");
482 early_memunmap(tmp, 2);
484 pr_info("EFI v%u.%.02u by %s\n",
485 efi.systab->hdr.revision >> 16,
486 efi.systab->hdr.revision & 0xffff, vendor);
488 if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables))
491 if (efi_config_init(arch_tables))
495 * Note: We currently don't support runtime services on an EFI
496 * that doesn't match the kernel 32/64-bit mode.
499 if (!efi_runtime_supported())
500 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
502 if (efi_runtime_disabled() || efi_runtime_init())
505 if (efi_memmap_init())
508 if (efi_enabled(EFI_DBG))
514 void __init efi_late_init(void)
519 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
523 addr = md->virt_addr;
524 npages = md->num_pages;
526 memrange_efi_to_native(&addr, &npages);
529 set_memory_x(addr, npages);
531 set_memory_nx(addr, npages);
534 void __init runtime_code_page_mkexec(void)
536 efi_memory_desc_t *md;
538 /* Make EFI runtime service code area executable */
539 for_each_efi_memory_desc(md) {
540 if (md->type != EFI_RUNTIME_SERVICES_CODE)
543 efi_set_executable(md, true);
547 void __init efi_memory_uc(u64 addr, unsigned long size)
549 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
552 npages = round_up(size, page_shift) / page_shift;
553 memrange_efi_to_native(&addr, &npages);
554 set_memory_uc(addr, npages);
557 void __init old_map_region(efi_memory_desc_t *md)
559 u64 start_pfn, end_pfn, end;
563 start_pfn = PFN_DOWN(md->phys_addr);
564 size = md->num_pages << PAGE_SHIFT;
565 end = md->phys_addr + size;
566 end_pfn = PFN_UP(end);
568 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
569 va = __va(md->phys_addr);
571 if (!(md->attribute & EFI_MEMORY_WB))
572 efi_memory_uc((u64)(unsigned long)va, size);
574 va = efi_ioremap(md->phys_addr, size,
575 md->type, md->attribute);
577 md->virt_addr = (u64) (unsigned long) va;
579 pr_err("ioremap of 0x%llX failed!\n",
580 (unsigned long long)md->phys_addr);
583 /* Merge contiguous regions of the same type and attribute */
584 static void __init efi_merge_regions(void)
586 efi_memory_desc_t *md, *prev_md = NULL;
588 for_each_efi_memory_desc(md) {
596 if (prev_md->type != md->type ||
597 prev_md->attribute != md->attribute) {
602 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
604 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
605 prev_md->num_pages += md->num_pages;
606 md->type = EFI_RESERVED_TYPE;
614 static void __init get_systab_virt_addr(efi_memory_desc_t *md)
619 size = md->num_pages << EFI_PAGE_SHIFT;
620 end = md->phys_addr + size;
621 systab = (u64)(unsigned long)efi_phys.systab;
622 if (md->phys_addr <= systab && systab < end) {
623 systab += md->virt_addr - md->phys_addr;
624 efi.systab = (efi_system_table_t *)(unsigned long)systab;
628 static void __init save_runtime_map(void)
630 #ifdef CONFIG_KEXEC_CORE
631 unsigned long desc_size;
632 efi_memory_desc_t *md;
633 void *tmp, *q = NULL;
636 if (efi_enabled(EFI_OLD_MEMMAP))
639 desc_size = efi.memmap.desc_size;
641 for_each_efi_memory_desc(md) {
642 if (!(md->attribute & EFI_MEMORY_RUNTIME) ||
643 (md->type == EFI_BOOT_SERVICES_CODE) ||
644 (md->type == EFI_BOOT_SERVICES_DATA))
646 tmp = krealloc(q, (count + 1) * desc_size, GFP_KERNEL);
651 memcpy(q + count * desc_size, md, desc_size);
655 efi_runtime_map_setup(q, count, desc_size);
660 pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
664 static void *realloc_pages(void *old_memmap, int old_shift)
668 ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
673 * A first-time allocation doesn't have anything to copy.
678 memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
681 free_pages((unsigned long)old_memmap, old_shift);
686 * Iterate the EFI memory map in reverse order because the regions
687 * will be mapped top-down. The end result is the same as if we had
688 * mapped things forward, but doesn't require us to change the
689 * existing implementation of efi_map_region().
691 static inline void *efi_map_next_entry_reverse(void *entry)
695 return efi.memmap.map_end - efi.memmap.desc_size;
697 entry -= efi.memmap.desc_size;
698 if (entry < efi.memmap.map)
705 * efi_map_next_entry - Return the next EFI memory map descriptor
706 * @entry: Previous EFI memory map descriptor
708 * This is a helper function to iterate over the EFI memory map, which
709 * we do in different orders depending on the current configuration.
711 * To begin traversing the memory map @entry must be %NULL.
713 * Returns %NULL when we reach the end of the memory map.
715 static void *efi_map_next_entry(void *entry)
717 if (!efi_enabled(EFI_OLD_MEMMAP) && efi_enabled(EFI_64BIT)) {
719 * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE
720 * config table feature requires us to map all entries
721 * in the same order as they appear in the EFI memory
722 * map. That is to say, entry N must have a lower
723 * virtual address than entry N+1. This is because the
724 * firmware toolchain leaves relative references in
725 * the code/data sections, which are split and become
726 * separate EFI memory regions. Mapping things
727 * out-of-order leads to the firmware accessing
728 * unmapped addresses.
730 * Since we need to map things this way whether or not
731 * the kernel actually makes use of
732 * EFI_PROPERTIES_TABLE, let's just switch to this
733 * scheme by default for 64-bit.
735 return efi_map_next_entry_reverse(entry);
740 return efi.memmap.map;
742 entry += efi.memmap.desc_size;
743 if (entry >= efi.memmap.map_end)
750 * Map the efi memory ranges of the runtime services and update new_mmap with
753 static void * __init efi_map_regions(int *count, int *pg_shift)
755 void *p, *new_memmap = NULL;
756 unsigned long left = 0;
757 unsigned long desc_size;
758 efi_memory_desc_t *md;
760 desc_size = efi.memmap.desc_size;
763 while ((p = efi_map_next_entry(p))) {
765 if (!(md->attribute & EFI_MEMORY_RUNTIME)) {
767 if (md->type != EFI_BOOT_SERVICES_CODE &&
768 md->type != EFI_BOOT_SERVICES_DATA)
774 get_systab_virt_addr(md);
776 if (left < desc_size) {
777 new_memmap = realloc_pages(new_memmap, *pg_shift);
781 left += PAGE_SIZE << *pg_shift;
785 memcpy(new_memmap + (*count * desc_size), md, desc_size);
794 static void __init kexec_enter_virtual_mode(void)
796 #ifdef CONFIG_KEXEC_CORE
797 efi_memory_desc_t *md;
798 unsigned int num_pages;
803 * We don't do virtual mode, since we don't do runtime services, on
806 if (!efi_is_native()) {
808 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
812 if (efi_alloc_page_tables()) {
813 pr_err("Failed to allocate EFI page tables\n");
814 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
819 * Map efi regions which were passed via setup_data. The virt_addr is a
820 * fixed addr which was used in first kernel of a kexec boot.
822 for_each_efi_memory_desc(md) {
823 efi_map_region_fixed(md); /* FIXME: add error handling */
824 get_systab_virt_addr(md);
831 num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE);
832 num_pages >>= PAGE_SHIFT;
834 if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) {
835 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
839 efi_sync_low_kernel_mappings();
842 * Now that EFI is in virtual mode, update the function
843 * pointers in the runtime service table to the new virtual addresses.
845 * Call EFI services through wrapper functions.
847 efi.runtime_version = efi_systab.hdr.revision;
849 efi_native_runtime_setup();
851 efi.set_virtual_address_map = NULL;
853 if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
854 runtime_code_page_mkexec();
856 /* clean DUMMY object */
857 efi_delete_dummy_variable();
862 * This function will switch the EFI runtime services to virtual mode.
863 * Essentially, we look through the EFI memmap and map every region that
864 * has the runtime attribute bit set in its memory descriptor into the
865 * efi_pgd page table.
867 * The old method which used to update that memory descriptor with the
868 * virtual address obtained from ioremap() is still supported when the
869 * kernel is booted with efi=old_map on its command line. Same old
870 * method enabled the runtime services to be called without having to
871 * thunk back into physical mode for every invocation.
873 * The new method does a pagetable switch in a preemption-safe manner
874 * so that we're in a different address space when calling a runtime
875 * function. For function arguments passing we do copy the PUDs of the
876 * kernel page table into efi_pgd prior to each call.
878 * Specially for kexec boot, efi runtime maps in previous kernel should
879 * be passed in via setup_data. In that case runtime ranges will be mapped
880 * to the same virtual addresses as the first kernel, see
881 * kexec_enter_virtual_mode().
883 static void __init __efi_enter_virtual_mode(void)
885 int count = 0, pg_shift = 0;
886 void *new_memmap = NULL;
891 if (efi_alloc_page_tables()) {
892 pr_err("Failed to allocate EFI page tables\n");
893 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
898 new_memmap = efi_map_regions(&count, &pg_shift);
900 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
901 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
909 if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) {
910 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
914 efi_sync_low_kernel_mappings();
916 if (efi_is_native()) {
917 status = phys_efi_set_virtual_address_map(
918 efi.memmap.desc_size * count,
919 efi.memmap.desc_size,
920 efi.memmap.desc_version,
921 (efi_memory_desc_t *)__pa(new_memmap));
923 status = efi_thunk_set_virtual_address_map(
924 efi_phys.set_virtual_address_map,
925 efi.memmap.desc_size * count,
926 efi.memmap.desc_size,
927 efi.memmap.desc_version,
928 (efi_memory_desc_t *)__pa(new_memmap));
931 if (status != EFI_SUCCESS) {
932 pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
934 panic("EFI call to SetVirtualAddressMap() failed!");
938 * Now that EFI is in virtual mode, update the function
939 * pointers in the runtime service table to the new virtual addresses.
941 * Call EFI services through wrapper functions.
943 efi.runtime_version = efi_systab.hdr.revision;
946 efi_native_runtime_setup();
948 efi_thunk_runtime_setup();
950 efi.set_virtual_address_map = NULL;
953 * Apply more restrictive page table mapping attributes now that
954 * SVAM() has been called and the firmware has performed all
955 * necessary relocation fixups for the new virtual addresses.
957 efi_runtime_update_mappings();
958 efi_dump_pagetable();
961 * We mapped the descriptor array into the EFI pagetable above
962 * but we're not unmapping it here because if we're running in
963 * EFI mixed mode we need all of memory to be accessible when
964 * we pass parameters to the EFI runtime services in the
967 free_pages((unsigned long)new_memmap, pg_shift);
969 /* clean DUMMY object */
970 efi_delete_dummy_variable();
973 void __init efi_enter_virtual_mode(void)
975 if (efi_enabled(EFI_PARAVIRT))
979 kexec_enter_virtual_mode();
981 __efi_enter_virtual_mode();
985 * Convenience functions to obtain memory types and attributes
987 u32 efi_mem_type(unsigned long phys_addr)
989 efi_memory_desc_t *md;
991 if (!efi_enabled(EFI_MEMMAP))
994 for_each_efi_memory_desc(md) {
995 if ((md->phys_addr <= phys_addr) &&
996 (phys_addr < (md->phys_addr +
997 (md->num_pages << EFI_PAGE_SHIFT))))
1003 static int __init arch_parse_efi_cmdline(char *str)
1006 pr_warn("need at least one option\n");
1010 if (parse_option_str(str, "old_map"))
1011 set_bit(EFI_OLD_MEMMAP, &efi.flags);
1015 early_param("efi", arch_parse_efi_cmdline);