2 * Extensible Firmware Interface
4 * Based on Extensible Firmware Interface Specification version 2.4
6 * Copyright (C) 2013, 2014 Linaro Ltd.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 #include <linux/dmi.h>
15 #include <linux/efi.h>
17 #include <linux/memblock.h>
18 #include <linux/mm_types.h>
19 #include <linux/preempt.h>
20 #include <linux/rbtree.h>
21 #include <linux/rwsem.h>
22 #include <linux/sched.h>
23 #include <linux/slab.h>
24 #include <linux/spinlock.h>
26 #include <asm/cacheflush.h>
29 #include <asm/pgalloc.h>
30 #include <asm/pgtable.h>
32 extern u64 efi_system_table
;
34 #ifdef CONFIG_ARM64_PTDUMP_DEBUGFS
35 #include <asm/ptdump.h>
37 static struct ptdump_info efi_ptdump_info
= {
39 .markers
= (struct addr_marker
[]){
40 { 0, "UEFI runtime start" },
41 { TASK_SIZE_64
, "UEFI runtime end" }
46 static int __init
ptdump_init(void)
48 if (!efi_enabled(EFI_RUNTIME_SERVICES
))
51 return ptdump_debugfs_register(&efi_ptdump_info
, "efi_page_tables");
53 device_initcall(ptdump_init
);
57 static bool __init
efi_virtmap_init(void)
59 efi_memory_desc_t
*md
;
62 efi_mm
.pgd
= pgd_alloc(&efi_mm
);
63 mm_init_cpumask(&efi_mm
);
64 init_new_context(NULL
, &efi_mm
);
67 for_each_efi_memory_desc(md
) {
68 phys_addr_t phys
= md
->phys_addr
;
71 if (!(md
->attribute
& EFI_MEMORY_RUNTIME
))
73 if (md
->virt_addr
== 0)
76 ret
= efi_create_mapping(&efi_mm
, md
);
78 pr_warn(" EFI remap %pa: failed to create mapping (%d)\n",
83 * If this entry covers the address of the UEFI system table,
84 * calculate and record its virtual address.
86 if (efi_system_table
>= phys
&&
87 efi_system_table
< phys
+ (md
->num_pages
* EFI_PAGE_SIZE
)) {
88 efi
.systab
= (void *)(unsigned long)(efi_system_table
-
89 phys
+ md
->virt_addr
);
94 pr_err("No virtual mapping found for the UEFI System Table\n");
98 if (efi_memattr_apply_permissions(&efi_mm
, efi_set_mapping_permissions
))
105 * Enable the UEFI Runtime Services if all prerequisites are in place, i.e.,
106 * non-early mapping of the UEFI system table and virtual mappings for all
107 * EFI_MEMORY_RUNTIME regions.
109 static int __init
arm_enable_runtime_services(void)
113 if (!efi_enabled(EFI_BOOT
)) {
114 pr_info("EFI services will not be available.\n");
120 mapsize
= efi
.memmap
.desc_size
* efi
.memmap
.nr_map
;
122 if (efi_memmap_init_late(efi
.memmap
.phys_map
, mapsize
)) {
123 pr_err("Failed to remap EFI memory map\n");
127 if (efi_runtime_disabled()) {
128 pr_info("EFI runtime services will be disabled.\n");
132 if (efi_enabled(EFI_RUNTIME_SERVICES
)) {
133 pr_info("EFI runtime services access via paravirt.\n");
137 pr_info("Remapping and enabling EFI services.\n");
139 if (!efi_virtmap_init()) {
140 pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n");
144 /* Set up runtime services function pointers */
145 efi_native_runtime_setup();
146 set_bit(EFI_RUNTIME_SERVICES
, &efi
.flags
);
150 early_initcall(arm_enable_runtime_services
);
152 void efi_virtmap_load(void)
155 efi_set_pgd(&efi_mm
);
158 void efi_virtmap_unload(void)
160 efi_set_pgd(current
->active_mm
);
165 static int __init
arm_dmi_init(void)
168 * On arm64/ARM, DMI depends on UEFI, and dmi_scan_machine() needs to
169 * be called early because dmi_id_init(), which is an arch_initcall
170 * itself, depends on dmi_scan_machine() having been called already.
174 dmi_set_dump_stack_arch_desc();
177 core_initcall(arm_dmi_init
);