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 efi_get_time(struct timespec *now)
106 status = efi.get_time(&eft, &cap);
107 if (status != EFI_SUCCESS)
108 pr_err("Oops: efitime: can't read time!\n");
110 now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour,
111 eft.minute, eft.second);
115 void __init efi_find_mirror(void)
117 efi_memory_desc_t *md;
118 u64 mirror_size = 0, total_size = 0;
120 for_each_efi_memory_desc(md) {
121 unsigned long long start = md->phys_addr;
122 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
125 if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
126 memblock_mark_mirror(start, size);
131 pr_info("Memory: %lldM/%lldM mirrored memory\n",
132 mirror_size>>20, total_size>>20);
136 * Tell the kernel about the EFI memory map. This might include
137 * more than the max 128 entries that can fit in the e820 legacy
138 * (zeropage) memory map.
141 static void __init do_add_efi_memmap(void)
143 efi_memory_desc_t *md;
145 for_each_efi_memory_desc(md) {
146 unsigned long long start = md->phys_addr;
147 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
151 case EFI_LOADER_CODE:
152 case EFI_LOADER_DATA:
153 case EFI_BOOT_SERVICES_CODE:
154 case EFI_BOOT_SERVICES_DATA:
155 case EFI_CONVENTIONAL_MEMORY:
156 if (md->attribute & EFI_MEMORY_WB)
157 e820_type = E820_RAM;
159 e820_type = E820_RESERVED;
161 case EFI_ACPI_RECLAIM_MEMORY:
162 e820_type = E820_ACPI;
164 case EFI_ACPI_MEMORY_NVS:
165 e820_type = E820_NVS;
167 case EFI_UNUSABLE_MEMORY:
168 e820_type = E820_UNUSABLE;
170 case EFI_PERSISTENT_MEMORY:
171 e820_type = E820_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_RESERVED;
182 e820_add_region(start, size, e820_type);
184 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
187 int __init efi_memblock_x86_reserve_range(void)
189 struct efi_info *e = &boot_params.efi_info;
192 if (efi_enabled(EFI_PARAVIRT))
196 /* Can't handle data above 4GB at this time */
197 if (e->efi_memmap_hi) {
198 pr_err("Memory map is above 4GB, disabling EFI.\n");
201 pmap = e->efi_memmap;
203 pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
205 efi.memmap.phys_map = pmap;
206 efi.memmap.nr_map = e->efi_memmap_size /
208 efi.memmap.desc_size = e->efi_memdesc_size;
209 efi.memmap.desc_version = e->efi_memdesc_version;
211 WARN(efi.memmap.desc_version != 1,
212 "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
213 efi.memmap.desc_version);
215 memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size);
220 void __init efi_print_memmap(void)
222 efi_memory_desc_t *md;
225 for_each_efi_memory_desc(md) {
228 pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n",
229 i++, efi_md_typeattr_format(buf, sizeof(buf), md),
231 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1,
232 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
236 void __init efi_unmap_memmap(void)
240 clear_bit(EFI_MEMMAP, &efi.flags);
242 size = efi.memmap.nr_map * efi.memmap.desc_size;
243 if (efi.memmap.map) {
244 early_memunmap(efi.memmap.map, size);
245 efi.memmap.map = NULL;
249 static int __init efi_systab_init(void *phys)
251 if (efi_enabled(EFI_64BIT)) {
252 efi_system_table_64_t *systab64;
253 struct efi_setup_data *data = NULL;
257 data = early_memremap(efi_setup, sizeof(*data));
261 systab64 = early_memremap((unsigned long)phys,
263 if (systab64 == NULL) {
264 pr_err("Couldn't map the system table!\n");
266 early_memunmap(data, sizeof(*data));
270 efi_systab.hdr = systab64->hdr;
271 efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor :
273 tmp |= data ? data->fw_vendor : systab64->fw_vendor;
274 efi_systab.fw_revision = systab64->fw_revision;
275 efi_systab.con_in_handle = systab64->con_in_handle;
276 tmp |= systab64->con_in_handle;
277 efi_systab.con_in = systab64->con_in;
278 tmp |= systab64->con_in;
279 efi_systab.con_out_handle = systab64->con_out_handle;
280 tmp |= systab64->con_out_handle;
281 efi_systab.con_out = systab64->con_out;
282 tmp |= systab64->con_out;
283 efi_systab.stderr_handle = systab64->stderr_handle;
284 tmp |= systab64->stderr_handle;
285 efi_systab.stderr = systab64->stderr;
286 tmp |= systab64->stderr;
287 efi_systab.runtime = data ?
288 (void *)(unsigned long)data->runtime :
289 (void *)(unsigned long)systab64->runtime;
290 tmp |= data ? data->runtime : systab64->runtime;
291 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
292 tmp |= systab64->boottime;
293 efi_systab.nr_tables = systab64->nr_tables;
294 efi_systab.tables = data ? (unsigned long)data->tables :
296 tmp |= data ? data->tables : systab64->tables;
298 early_memunmap(systab64, sizeof(*systab64));
300 early_memunmap(data, sizeof(*data));
303 pr_err("EFI data located above 4GB, disabling EFI.\n");
308 efi_system_table_32_t *systab32;
310 systab32 = early_memremap((unsigned long)phys,
312 if (systab32 == NULL) {
313 pr_err("Couldn't map the system table!\n");
317 efi_systab.hdr = systab32->hdr;
318 efi_systab.fw_vendor = systab32->fw_vendor;
319 efi_systab.fw_revision = systab32->fw_revision;
320 efi_systab.con_in_handle = systab32->con_in_handle;
321 efi_systab.con_in = systab32->con_in;
322 efi_systab.con_out_handle = systab32->con_out_handle;
323 efi_systab.con_out = systab32->con_out;
324 efi_systab.stderr_handle = systab32->stderr_handle;
325 efi_systab.stderr = systab32->stderr;
326 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
327 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
328 efi_systab.nr_tables = systab32->nr_tables;
329 efi_systab.tables = systab32->tables;
331 early_memunmap(systab32, sizeof(*systab32));
334 efi.systab = &efi_systab;
337 * Verify the EFI Table
339 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
340 pr_err("System table signature incorrect!\n");
343 if ((efi.systab->hdr.revision >> 16) == 0)
344 pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n",
345 efi.systab->hdr.revision >> 16,
346 efi.systab->hdr.revision & 0xffff);
351 static int __init efi_runtime_init32(void)
353 efi_runtime_services_32_t *runtime;
355 runtime = early_memremap((unsigned long)efi.systab->runtime,
356 sizeof(efi_runtime_services_32_t));
358 pr_err("Could not map the runtime service table!\n");
363 * We will only need *early* access to the SetVirtualAddressMap
364 * EFI runtime service. All other runtime services will be called
365 * via the virtual mapping.
367 efi_phys.set_virtual_address_map =
368 (efi_set_virtual_address_map_t *)
369 (unsigned long)runtime->set_virtual_address_map;
370 early_memunmap(runtime, sizeof(efi_runtime_services_32_t));
375 static int __init efi_runtime_init64(void)
377 efi_runtime_services_64_t *runtime;
379 runtime = early_memremap((unsigned long)efi.systab->runtime,
380 sizeof(efi_runtime_services_64_t));
382 pr_err("Could not map the runtime service table!\n");
387 * We will only need *early* access to the SetVirtualAddressMap
388 * EFI runtime service. All other runtime services will be called
389 * via the virtual mapping.
391 efi_phys.set_virtual_address_map =
392 (efi_set_virtual_address_map_t *)
393 (unsigned long)runtime->set_virtual_address_map;
394 early_memunmap(runtime, sizeof(efi_runtime_services_64_t));
399 static int __init efi_runtime_init(void)
404 * Check out the runtime services table. We need to map
405 * the runtime services table so that we can grab the physical
406 * address of several of the EFI runtime functions, needed to
407 * set the firmware into virtual mode.
409 * When EFI_PARAVIRT is in force then we could not map runtime
410 * service memory region because we do not have direct access to it.
411 * However, runtime services are available through proxy functions
412 * (e.g. in case of Xen dom0 EFI implementation they call special
413 * hypercall which executes relevant EFI functions) and that is why
414 * they are always enabled.
417 if (!efi_enabled(EFI_PARAVIRT)) {
418 if (efi_enabled(EFI_64BIT))
419 rv = efi_runtime_init64();
421 rv = efi_runtime_init32();
427 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
432 static int __init efi_memmap_init(void)
434 unsigned long addr, size;
436 if (efi_enabled(EFI_PARAVIRT))
439 /* Map the EFI memory map */
440 size = efi.memmap.nr_map * efi.memmap.desc_size;
441 addr = (unsigned long)efi.memmap.phys_map;
443 efi.memmap.map = early_memremap(addr, size);
444 if (efi.memmap.map == NULL) {
445 pr_err("Could not map the memory map!\n");
449 efi.memmap.map_end = efi.memmap.map + size;
454 set_bit(EFI_MEMMAP, &efi.flags);
459 void __init efi_init(void)
462 char vendor[100] = "unknown";
467 if (boot_params.efi_info.efi_systab_hi ||
468 boot_params.efi_info.efi_memmap_hi) {
469 pr_info("Table located above 4GB, disabling EFI.\n");
472 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
474 efi_phys.systab = (efi_system_table_t *)
475 (boot_params.efi_info.efi_systab |
476 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
479 if (efi_systab_init(efi_phys.systab))
482 efi.config_table = (unsigned long)efi.systab->tables;
483 efi.fw_vendor = (unsigned long)efi.systab->fw_vendor;
484 efi.runtime = (unsigned long)efi.systab->runtime;
487 * Show what we know for posterity
489 c16 = tmp = early_memremap(efi.systab->fw_vendor, 2);
491 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
495 pr_err("Could not map the firmware vendor!\n");
496 early_memunmap(tmp, 2);
498 pr_info("EFI v%u.%.02u by %s\n",
499 efi.systab->hdr.revision >> 16,
500 efi.systab->hdr.revision & 0xffff, vendor);
502 if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables))
505 if (efi_config_init(arch_tables))
509 * Note: We currently don't support runtime services on an EFI
510 * that doesn't match the kernel 32/64-bit mode.
513 if (!efi_runtime_supported())
514 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
516 if (efi_runtime_disabled() || efi_runtime_init())
519 if (efi_memmap_init())
522 if (efi_enabled(EFI_DBG))
528 void __init efi_late_init(void)
533 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
537 addr = md->virt_addr;
538 npages = md->num_pages;
540 memrange_efi_to_native(&addr, &npages);
543 set_memory_x(addr, npages);
545 set_memory_nx(addr, npages);
548 void __init runtime_code_page_mkexec(void)
550 efi_memory_desc_t *md;
552 /* Make EFI runtime service code area executable */
553 for_each_efi_memory_desc(md) {
554 if (md->type != EFI_RUNTIME_SERVICES_CODE)
557 efi_set_executable(md, true);
561 void __init efi_memory_uc(u64 addr, unsigned long size)
563 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
566 npages = round_up(size, page_shift) / page_shift;
567 memrange_efi_to_native(&addr, &npages);
568 set_memory_uc(addr, npages);
571 void __init old_map_region(efi_memory_desc_t *md)
573 u64 start_pfn, end_pfn, end;
577 start_pfn = PFN_DOWN(md->phys_addr);
578 size = md->num_pages << PAGE_SHIFT;
579 end = md->phys_addr + size;
580 end_pfn = PFN_UP(end);
582 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
583 va = __va(md->phys_addr);
585 if (!(md->attribute & EFI_MEMORY_WB))
586 efi_memory_uc((u64)(unsigned long)va, size);
588 va = efi_ioremap(md->phys_addr, size,
589 md->type, md->attribute);
591 md->virt_addr = (u64) (unsigned long) va;
593 pr_err("ioremap of 0x%llX failed!\n",
594 (unsigned long long)md->phys_addr);
597 /* Merge contiguous regions of the same type and attribute */
598 static void __init efi_merge_regions(void)
600 efi_memory_desc_t *md, *prev_md = NULL;
602 for_each_efi_memory_desc(md) {
610 if (prev_md->type != md->type ||
611 prev_md->attribute != md->attribute) {
616 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
618 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
619 prev_md->num_pages += md->num_pages;
620 md->type = EFI_RESERVED_TYPE;
628 static void __init get_systab_virt_addr(efi_memory_desc_t *md)
633 size = md->num_pages << EFI_PAGE_SHIFT;
634 end = md->phys_addr + size;
635 systab = (u64)(unsigned long)efi_phys.systab;
636 if (md->phys_addr <= systab && systab < end) {
637 systab += md->virt_addr - md->phys_addr;
638 efi.systab = (efi_system_table_t *)(unsigned long)systab;
642 static void __init save_runtime_map(void)
644 #ifdef CONFIG_KEXEC_CORE
645 unsigned long desc_size;
646 efi_memory_desc_t *md;
647 void *tmp, *q = NULL;
650 if (efi_enabled(EFI_OLD_MEMMAP))
653 desc_size = efi.memmap.desc_size;
655 for_each_efi_memory_desc(md) {
656 if (!(md->attribute & EFI_MEMORY_RUNTIME) ||
657 (md->type == EFI_BOOT_SERVICES_CODE) ||
658 (md->type == EFI_BOOT_SERVICES_DATA))
660 tmp = krealloc(q, (count + 1) * desc_size, GFP_KERNEL);
665 memcpy(q + count * desc_size, md, desc_size);
669 efi_runtime_map_setup(q, count, desc_size);
674 pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
678 static void *realloc_pages(void *old_memmap, int old_shift)
682 ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
687 * A first-time allocation doesn't have anything to copy.
692 memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
695 free_pages((unsigned long)old_memmap, old_shift);
700 * Iterate the EFI memory map in reverse order because the regions
701 * will be mapped top-down. The end result is the same as if we had
702 * mapped things forward, but doesn't require us to change the
703 * existing implementation of efi_map_region().
705 static inline void *efi_map_next_entry_reverse(void *entry)
709 return efi.memmap.map_end - efi.memmap.desc_size;
711 entry -= efi.memmap.desc_size;
712 if (entry < efi.memmap.map)
719 * efi_map_next_entry - Return the next EFI memory map descriptor
720 * @entry: Previous EFI memory map descriptor
722 * This is a helper function to iterate over the EFI memory map, which
723 * we do in different orders depending on the current configuration.
725 * To begin traversing the memory map @entry must be %NULL.
727 * Returns %NULL when we reach the end of the memory map.
729 static void *efi_map_next_entry(void *entry)
731 if (!efi_enabled(EFI_OLD_MEMMAP) && efi_enabled(EFI_64BIT)) {
733 * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE
734 * config table feature requires us to map all entries
735 * in the same order as they appear in the EFI memory
736 * map. That is to say, entry N must have a lower
737 * virtual address than entry N+1. This is because the
738 * firmware toolchain leaves relative references in
739 * the code/data sections, which are split and become
740 * separate EFI memory regions. Mapping things
741 * out-of-order leads to the firmware accessing
742 * unmapped addresses.
744 * Since we need to map things this way whether or not
745 * the kernel actually makes use of
746 * EFI_PROPERTIES_TABLE, let's just switch to this
747 * scheme by default for 64-bit.
749 return efi_map_next_entry_reverse(entry);
754 return efi.memmap.map;
756 entry += efi.memmap.desc_size;
757 if (entry >= efi.memmap.map_end)
764 * Map the efi memory ranges of the runtime services and update new_mmap with
767 static void * __init efi_map_regions(int *count, int *pg_shift)
769 void *p, *new_memmap = NULL;
770 unsigned long left = 0;
771 unsigned long desc_size;
772 efi_memory_desc_t *md;
774 desc_size = efi.memmap.desc_size;
777 while ((p = efi_map_next_entry(p))) {
779 if (!(md->attribute & EFI_MEMORY_RUNTIME)) {
781 if (md->type != EFI_BOOT_SERVICES_CODE &&
782 md->type != EFI_BOOT_SERVICES_DATA)
788 get_systab_virt_addr(md);
790 if (left < desc_size) {
791 new_memmap = realloc_pages(new_memmap, *pg_shift);
795 left += PAGE_SIZE << *pg_shift;
799 memcpy(new_memmap + (*count * desc_size), md, desc_size);
808 static void __init kexec_enter_virtual_mode(void)
810 #ifdef CONFIG_KEXEC_CORE
811 efi_memory_desc_t *md;
812 unsigned int num_pages;
817 * We don't do virtual mode, since we don't do runtime services, on
820 if (!efi_is_native()) {
822 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
826 if (efi_alloc_page_tables()) {
827 pr_err("Failed to allocate EFI page tables\n");
828 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
833 * Map efi regions which were passed via setup_data. The virt_addr is a
834 * fixed addr which was used in first kernel of a kexec boot.
836 for_each_efi_memory_desc(md) {
837 efi_map_region_fixed(md); /* FIXME: add error handling */
838 get_systab_virt_addr(md);
845 num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE);
846 num_pages >>= PAGE_SHIFT;
848 if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) {
849 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
853 efi_sync_low_kernel_mappings();
856 * Now that EFI is in virtual mode, update the function
857 * pointers in the runtime service table to the new virtual addresses.
859 * Call EFI services through wrapper functions.
861 efi.runtime_version = efi_systab.hdr.revision;
863 efi_native_runtime_setup();
865 efi.set_virtual_address_map = NULL;
867 if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
868 runtime_code_page_mkexec();
870 /* clean DUMMY object */
871 efi_delete_dummy_variable();
876 * This function will switch the EFI runtime services to virtual mode.
877 * Essentially, we look through the EFI memmap and map every region that
878 * has the runtime attribute bit set in its memory descriptor into the
879 * efi_pgd page table.
881 * The old method which used to update that memory descriptor with the
882 * virtual address obtained from ioremap() is still supported when the
883 * kernel is booted with efi=old_map on its command line. Same old
884 * method enabled the runtime services to be called without having to
885 * thunk back into physical mode for every invocation.
887 * The new method does a pagetable switch in a preemption-safe manner
888 * so that we're in a different address space when calling a runtime
889 * function. For function arguments passing we do copy the PUDs of the
890 * kernel page table into efi_pgd prior to each call.
892 * Specially for kexec boot, efi runtime maps in previous kernel should
893 * be passed in via setup_data. In that case runtime ranges will be mapped
894 * to the same virtual addresses as the first kernel, see
895 * kexec_enter_virtual_mode().
897 static void __init __efi_enter_virtual_mode(void)
899 int count = 0, pg_shift = 0;
900 void *new_memmap = NULL;
905 if (efi_alloc_page_tables()) {
906 pr_err("Failed to allocate EFI page tables\n");
907 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
912 new_memmap = efi_map_regions(&count, &pg_shift);
914 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
915 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
923 if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) {
924 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
928 efi_sync_low_kernel_mappings();
930 if (efi_is_native()) {
931 status = phys_efi_set_virtual_address_map(
932 efi.memmap.desc_size * count,
933 efi.memmap.desc_size,
934 efi.memmap.desc_version,
935 (efi_memory_desc_t *)__pa(new_memmap));
937 status = efi_thunk_set_virtual_address_map(
938 efi_phys.set_virtual_address_map,
939 efi.memmap.desc_size * count,
940 efi.memmap.desc_size,
941 efi.memmap.desc_version,
942 (efi_memory_desc_t *)__pa(new_memmap));
945 if (status != EFI_SUCCESS) {
946 pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
948 panic("EFI call to SetVirtualAddressMap() failed!");
952 * Now that EFI is in virtual mode, update the function
953 * pointers in the runtime service table to the new virtual addresses.
955 * Call EFI services through wrapper functions.
957 efi.runtime_version = efi_systab.hdr.revision;
960 efi_native_runtime_setup();
962 efi_thunk_runtime_setup();
964 efi.set_virtual_address_map = NULL;
967 * Apply more restrictive page table mapping attributes now that
968 * SVAM() has been called and the firmware has performed all
969 * necessary relocation fixups for the new virtual addresses.
971 efi_runtime_update_mappings();
972 efi_dump_pagetable();
975 * We mapped the descriptor array into the EFI pagetable above
976 * but we're not unmapping it here because if we're running in
977 * EFI mixed mode we need all of memory to be accessible when
978 * we pass parameters to the EFI runtime services in the
981 * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift);
983 free_pages((unsigned long)new_memmap, pg_shift);
985 /* clean DUMMY object */
986 efi_delete_dummy_variable();
989 void __init efi_enter_virtual_mode(void)
991 if (efi_enabled(EFI_PARAVIRT))
995 kexec_enter_virtual_mode();
997 __efi_enter_virtual_mode();
1001 * Convenience functions to obtain memory types and attributes
1003 u32 efi_mem_type(unsigned long phys_addr)
1005 efi_memory_desc_t *md;
1007 if (!efi_enabled(EFI_MEMMAP))
1010 for_each_efi_memory_desc(md) {
1011 if ((md->phys_addr <= phys_addr) &&
1012 (phys_addr < (md->phys_addr +
1013 (md->num_pages << EFI_PAGE_SHIFT))))
1019 static int __init arch_parse_efi_cmdline(char *str)
1022 pr_warn("need at least one option\n");
1026 if (parse_option_str(str, "old_map"))
1027 set_bit(EFI_OLD_MEMMAP, &efi.flags);
1031 early_param("efi", arch_parse_efi_cmdline);