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);
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)
130 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
131 efi_memory_desc_t *md = p;
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;
158 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
159 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
160 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
162 e820_type = E820_RESERVED;
165 e820_add_region(start, size, e820_type);
167 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
170 int __init efi_memblock_x86_reserve_range(void)
172 struct efi_info *e = &boot_params.efi_info;
175 if (efi_enabled(EFI_PARAVIRT))
179 /* Can't handle data above 4GB at this time */
180 if (e->efi_memmap_hi) {
181 pr_err("Memory map is above 4GB, disabling EFI.\n");
184 pmap = e->efi_memmap;
186 pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
188 memmap.phys_map = (void *)pmap;
189 memmap.nr_map = e->efi_memmap_size /
191 memmap.desc_size = e->efi_memdesc_size;
192 memmap.desc_version = e->efi_memdesc_version;
194 memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
196 efi.memmap = &memmap;
201 static void __init print_efi_memmap(void)
204 efi_memory_desc_t *md;
208 for (p = memmap.map, i = 0;
210 p += memmap.desc_size, i++) {
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),
218 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
220 #endif /* EFI_DEBUG */
223 void __init efi_unmap_memmap(void)
225 clear_bit(EFI_MEMMAP, &efi.flags);
227 early_memunmap(memmap.map, memmap.nr_map * memmap.desc_size);
232 static int __init efi_systab_init(void *phys)
234 if (efi_enabled(EFI_64BIT)) {
235 efi_system_table_64_t *systab64;
236 struct efi_setup_data *data = NULL;
240 data = early_memremap(efi_setup, sizeof(*data));
244 systab64 = early_memremap((unsigned long)phys,
246 if (systab64 == NULL) {
247 pr_err("Couldn't map the system table!\n");
249 early_memunmap(data, sizeof(*data));
253 efi_systab.hdr = systab64->hdr;
254 efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor :
256 tmp |= data ? data->fw_vendor : systab64->fw_vendor;
257 efi_systab.fw_revision = systab64->fw_revision;
258 efi_systab.con_in_handle = systab64->con_in_handle;
259 tmp |= systab64->con_in_handle;
260 efi_systab.con_in = systab64->con_in;
261 tmp |= systab64->con_in;
262 efi_systab.con_out_handle = systab64->con_out_handle;
263 tmp |= systab64->con_out_handle;
264 efi_systab.con_out = systab64->con_out;
265 tmp |= systab64->con_out;
266 efi_systab.stderr_handle = systab64->stderr_handle;
267 tmp |= systab64->stderr_handle;
268 efi_systab.stderr = systab64->stderr;
269 tmp |= systab64->stderr;
270 efi_systab.runtime = data ?
271 (void *)(unsigned long)data->runtime :
272 (void *)(unsigned long)systab64->runtime;
273 tmp |= data ? data->runtime : systab64->runtime;
274 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
275 tmp |= systab64->boottime;
276 efi_systab.nr_tables = systab64->nr_tables;
277 efi_systab.tables = data ? (unsigned long)data->tables :
279 tmp |= data ? data->tables : systab64->tables;
281 early_memunmap(systab64, sizeof(*systab64));
283 early_memunmap(data, sizeof(*data));
286 pr_err("EFI data located above 4GB, disabling EFI.\n");
291 efi_system_table_32_t *systab32;
293 systab32 = early_memremap((unsigned long)phys,
295 if (systab32 == NULL) {
296 pr_err("Couldn't map the system table!\n");
300 efi_systab.hdr = systab32->hdr;
301 efi_systab.fw_vendor = systab32->fw_vendor;
302 efi_systab.fw_revision = systab32->fw_revision;
303 efi_systab.con_in_handle = systab32->con_in_handle;
304 efi_systab.con_in = systab32->con_in;
305 efi_systab.con_out_handle = systab32->con_out_handle;
306 efi_systab.con_out = systab32->con_out;
307 efi_systab.stderr_handle = systab32->stderr_handle;
308 efi_systab.stderr = systab32->stderr;
309 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
310 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
311 efi_systab.nr_tables = systab32->nr_tables;
312 efi_systab.tables = systab32->tables;
314 early_memunmap(systab32, sizeof(*systab32));
317 efi.systab = &efi_systab;
320 * Verify the EFI Table
322 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
323 pr_err("System table signature incorrect!\n");
326 if ((efi.systab->hdr.revision >> 16) == 0)
327 pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n",
328 efi.systab->hdr.revision >> 16,
329 efi.systab->hdr.revision & 0xffff);
331 set_bit(EFI_SYSTEM_TABLES, &efi.flags);
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 if (efi_enabled(EFI_PARAVIRT))
422 /* Map the EFI memory map */
423 memmap.map = early_memremap((unsigned long)memmap.phys_map,
424 memmap.nr_map * memmap.desc_size);
425 if (memmap.map == NULL) {
426 pr_err("Could not map the memory map!\n");
429 memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
434 set_bit(EFI_MEMMAP, &efi.flags);
439 void __init efi_init(void)
442 char vendor[100] = "unknown";
447 if (boot_params.efi_info.efi_systab_hi ||
448 boot_params.efi_info.efi_memmap_hi) {
449 pr_info("Table located above 4GB, disabling EFI.\n");
452 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
454 efi_phys.systab = (efi_system_table_t *)
455 (boot_params.efi_info.efi_systab |
456 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
459 if (efi_systab_init(efi_phys.systab))
462 efi.config_table = (unsigned long)efi.systab->tables;
463 efi.fw_vendor = (unsigned long)efi.systab->fw_vendor;
464 efi.runtime = (unsigned long)efi.systab->runtime;
467 * Show what we know for posterity
469 c16 = tmp = early_memremap(efi.systab->fw_vendor, 2);
471 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
475 pr_err("Could not map the firmware vendor!\n");
476 early_memunmap(tmp, 2);
478 pr_info("EFI v%u.%.02u by %s\n",
479 efi.systab->hdr.revision >> 16,
480 efi.systab->hdr.revision & 0xffff, vendor);
482 if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables))
485 if (efi_config_init(arch_tables))
489 * Note: We currently don't support runtime services on an EFI
490 * that doesn't match the kernel 32/64-bit mode.
493 if (!efi_runtime_supported())
494 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
496 if (efi_runtime_disabled() || efi_runtime_init())
499 if (efi_memmap_init())
502 if (efi_enabled(EFI_DBG))
506 void __init efi_late_init(void)
511 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
515 addr = md->virt_addr;
516 npages = md->num_pages;
518 memrange_efi_to_native(&addr, &npages);
521 set_memory_x(addr, npages);
523 set_memory_nx(addr, npages);
526 void __init runtime_code_page_mkexec(void)
528 efi_memory_desc_t *md;
531 /* Make EFI runtime service code area executable */
532 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
535 if (md->type != EFI_RUNTIME_SERVICES_CODE)
538 efi_set_executable(md, true);
542 void __init efi_memory_uc(u64 addr, unsigned long size)
544 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
547 npages = round_up(size, page_shift) / page_shift;
548 memrange_efi_to_native(&addr, &npages);
549 set_memory_uc(addr, npages);
552 void __init old_map_region(efi_memory_desc_t *md)
554 u64 start_pfn, end_pfn, end;
558 start_pfn = PFN_DOWN(md->phys_addr);
559 size = md->num_pages << PAGE_SHIFT;
560 end = md->phys_addr + size;
561 end_pfn = PFN_UP(end);
563 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
564 va = __va(md->phys_addr);
566 if (!(md->attribute & EFI_MEMORY_WB))
567 efi_memory_uc((u64)(unsigned long)va, size);
569 va = efi_ioremap(md->phys_addr, size,
570 md->type, md->attribute);
572 md->virt_addr = (u64) (unsigned long) va;
574 pr_err("ioremap of 0x%llX failed!\n",
575 (unsigned long long)md->phys_addr);
578 /* Merge contiguous regions of the same type and attribute */
579 static void __init efi_merge_regions(void)
582 efi_memory_desc_t *md, *prev_md = NULL;
584 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
593 if (prev_md->type != md->type ||
594 prev_md->attribute != md->attribute) {
599 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
601 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
602 prev_md->num_pages += md->num_pages;
603 md->type = EFI_RESERVED_TYPE;
611 static void __init get_systab_virt_addr(efi_memory_desc_t *md)
616 size = md->num_pages << EFI_PAGE_SHIFT;
617 end = md->phys_addr + size;
618 systab = (u64)(unsigned long)efi_phys.systab;
619 if (md->phys_addr <= systab && systab < end) {
620 systab += md->virt_addr - md->phys_addr;
621 efi.systab = (efi_system_table_t *)(unsigned long)systab;
625 static void __init save_runtime_map(void)
628 efi_memory_desc_t *md;
629 void *tmp, *p, *q = NULL;
632 if (efi_enabled(EFI_OLD_MEMMAP))
635 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
638 if (!(md->attribute & EFI_MEMORY_RUNTIME) ||
639 (md->type == EFI_BOOT_SERVICES_CODE) ||
640 (md->type == EFI_BOOT_SERVICES_DATA))
642 tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL);
647 memcpy(q + count * memmap.desc_size, md, memmap.desc_size);
651 efi_runtime_map_setup(q, count, memmap.desc_size);
656 pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
660 static void *realloc_pages(void *old_memmap, int old_shift)
664 ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
669 * A first-time allocation doesn't have anything to copy.
674 memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
677 free_pages((unsigned long)old_memmap, old_shift);
682 * Map the efi memory ranges of the runtime services and update new_mmap with
685 static void * __init efi_map_regions(int *count, int *pg_shift)
687 void *p, *new_memmap = NULL;
688 unsigned long left = 0;
689 efi_memory_desc_t *md;
691 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
693 if (!(md->attribute & EFI_MEMORY_RUNTIME)) {
695 if (md->type != EFI_BOOT_SERVICES_CODE &&
696 md->type != EFI_BOOT_SERVICES_DATA)
702 get_systab_virt_addr(md);
704 if (left < memmap.desc_size) {
705 new_memmap = realloc_pages(new_memmap, *pg_shift);
709 left += PAGE_SIZE << *pg_shift;
713 memcpy(new_memmap + (*count * memmap.desc_size), md,
716 left -= memmap.desc_size;
723 static void __init kexec_enter_virtual_mode(void)
726 efi_memory_desc_t *md;
732 * We don't do virtual mode, since we don't do runtime services, on
735 if (!efi_is_native()) {
737 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
742 * Map efi regions which were passed via setup_data. The virt_addr is a
743 * fixed addr which was used in first kernel of a kexec boot.
745 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
747 efi_map_region_fixed(md); /* FIXME: add error handling */
748 get_systab_virt_addr(md);
755 efi_sync_low_kernel_mappings();
758 * Now that EFI is in virtual mode, update the function
759 * pointers in the runtime service table to the new virtual addresses.
761 * Call EFI services through wrapper functions.
763 efi.runtime_version = efi_systab.hdr.revision;
765 efi_native_runtime_setup();
767 efi.set_virtual_address_map = NULL;
769 if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
770 runtime_code_page_mkexec();
772 /* clean DUMMY object */
773 efi_delete_dummy_variable();
778 * This function will switch the EFI runtime services to virtual mode.
779 * Essentially, we look through the EFI memmap and map every region that
780 * has the runtime attribute bit set in its memory descriptor into the
781 * ->trampoline_pgd page table using a top-down VA allocation scheme.
783 * The old method which used to update that memory descriptor with the
784 * virtual address obtained from ioremap() is still supported when the
785 * kernel is booted with efi=old_map on its command line. Same old
786 * method enabled the runtime services to be called without having to
787 * thunk back into physical mode for every invocation.
789 * The new method does a pagetable switch in a preemption-safe manner
790 * so that we're in a different address space when calling a runtime
791 * function. For function arguments passing we do copy the PGDs of the
792 * kernel page table into ->trampoline_pgd prior to each call.
794 * Specially for kexec boot, efi runtime maps in previous kernel should
795 * be passed in via setup_data. In that case runtime ranges will be mapped
796 * to the same virtual addresses as the first kernel, see
797 * kexec_enter_virtual_mode().
799 static void __init __efi_enter_virtual_mode(void)
801 int count = 0, pg_shift = 0;
802 void *new_memmap = NULL;
808 new_memmap = efi_map_regions(&count, &pg_shift);
810 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
811 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
819 if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) {
820 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
824 efi_sync_low_kernel_mappings();
825 efi_dump_pagetable();
827 if (efi_is_native()) {
828 status = phys_efi_set_virtual_address_map(
829 memmap.desc_size * count,
832 (efi_memory_desc_t *)__pa(new_memmap));
834 status = efi_thunk_set_virtual_address_map(
835 efi_phys.set_virtual_address_map,
836 memmap.desc_size * count,
839 (efi_memory_desc_t *)__pa(new_memmap));
842 if (status != EFI_SUCCESS) {
843 pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
845 panic("EFI call to SetVirtualAddressMap() failed!");
849 * Now that EFI is in virtual mode, update the function
850 * pointers in the runtime service table to the new virtual addresses.
852 * Call EFI services through wrapper functions.
854 efi.runtime_version = efi_systab.hdr.revision;
857 efi_native_runtime_setup();
859 efi_thunk_runtime_setup();
861 efi.set_virtual_address_map = NULL;
863 efi_runtime_mkexec();
866 * We mapped the descriptor array into the EFI pagetable above but we're
867 * not unmapping it here. Here's why:
869 * We're copying select PGDs from the kernel page table to the EFI page
870 * table and when we do so and make changes to those PGDs like unmapping
871 * stuff from them, those changes appear in the kernel page table and we
874 * From setup_real_mode():
877 * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd;
879 * In this particular case, our allocation is in PGD 0 of the EFI page
880 * table but we've copied that PGD from PGD[272] of the EFI page table:
882 * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272
884 * where the direct memory mapping in kernel space is.
886 * new_memmap's VA comes from that direct mapping and thus clearing it,
887 * it would get cleared in the kernel page table too.
889 * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift);
891 free_pages((unsigned long)new_memmap, pg_shift);
893 /* clean DUMMY object */
894 efi_delete_dummy_variable();
897 void __init efi_enter_virtual_mode(void)
899 if (efi_enabled(EFI_PARAVIRT))
903 kexec_enter_virtual_mode();
905 __efi_enter_virtual_mode();
909 * Convenience functions to obtain memory types and attributes
911 u32 efi_mem_type(unsigned long phys_addr)
913 efi_memory_desc_t *md;
916 if (!efi_enabled(EFI_MEMMAP))
919 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
921 if ((md->phys_addr <= phys_addr) &&
922 (phys_addr < (md->phys_addr +
923 (md->num_pages << EFI_PAGE_SHIFT))))
929 u64 efi_mem_attributes(unsigned long phys_addr)
931 efi_memory_desc_t *md;
934 if (!efi_enabled(EFI_MEMMAP))
937 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
939 if ((md->phys_addr <= phys_addr) &&
940 (phys_addr < (md->phys_addr +
941 (md->num_pages << EFI_PAGE_SHIFT))))
942 return md->attribute;
947 static int __init arch_parse_efi_cmdline(char *str)
949 if (parse_option_str(str, "old_map"))
950 set_bit(EFI_OLD_MEMMAP, &efi.flags);
951 if (parse_option_str(str, "debug"))
952 set_bit(EFI_DBG, &efi.flags);
956 early_param("efi", arch_parse_efi_cmdline);