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e5bc22a4 AB |
1 | /* |
2 | * Extensible Firmware Interface | |
3 | * | |
4 | * Based on Extensible Firmware Interface Specification version 2.4 | |
5 | * | |
6 | * Copyright (C) 2013, 2014 Linaro Ltd. | |
7 | * | |
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. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/efi.h> | |
f7d92489 | 15 | #include <linux/io.h> |
e5bc22a4 AB |
16 | #include <linux/memblock.h> |
17 | #include <linux/mm_types.h> | |
18 | #include <linux/preempt.h> | |
19 | #include <linux/rbtree.h> | |
20 | #include <linux/rwsem.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/spinlock.h> | |
24 | ||
25 | #include <asm/cacheflush.h> | |
26 | #include <asm/efi.h> | |
e5bc22a4 | 27 | #include <asm/mmu.h> |
f7d92489 | 28 | #include <asm/pgalloc.h> |
e5bc22a4 AB |
29 | #include <asm/pgtable.h> |
30 | ||
e5bc22a4 AB |
31 | extern u64 efi_system_table; |
32 | ||
33 | static struct mm_struct efi_mm = { | |
34 | .mm_rb = RB_ROOT, | |
e5bc22a4 AB |
35 | .mm_users = ATOMIC_INIT(2), |
36 | .mm_count = ATOMIC_INIT(1), | |
37 | .mmap_sem = __RWSEM_INITIALIZER(efi_mm.mmap_sem), | |
38 | .page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock), | |
39 | .mmlist = LIST_HEAD_INIT(efi_mm.mmlist), | |
40 | }; | |
41 | ||
4ddb9bf8 | 42 | #ifdef CONFIG_ARM64_PTDUMP_DEBUGFS |
9d80448a AB |
43 | #include <asm/ptdump.h> |
44 | ||
45 | static struct ptdump_info efi_ptdump_info = { | |
46 | .mm = &efi_mm, | |
47 | .markers = (struct addr_marker[]){ | |
48 | { 0, "UEFI runtime start" }, | |
49 | { TASK_SIZE_64, "UEFI runtime end" } | |
50 | }, | |
51 | .base_addr = 0, | |
52 | }; | |
53 | ||
54 | static int __init ptdump_init(void) | |
55 | { | |
4ddb9bf8 | 56 | return ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables"); |
9d80448a AB |
57 | } |
58 | device_initcall(ptdump_init); | |
59 | ||
60 | #endif | |
61 | ||
e5bc22a4 AB |
62 | static bool __init efi_virtmap_init(void) |
63 | { | |
64 | efi_memory_desc_t *md; | |
14c43be6 | 65 | bool systab_found; |
e5bc22a4 | 66 | |
f7d92489 | 67 | efi_mm.pgd = pgd_alloc(&efi_mm); |
e5bc22a4 AB |
68 | init_new_context(NULL, &efi_mm); |
69 | ||
14c43be6 | 70 | systab_found = false; |
78ce248f | 71 | for_each_efi_memory_desc(md) { |
f7d92489 AB |
72 | phys_addr_t phys = md->phys_addr; |
73 | int ret; | |
e5bc22a4 AB |
74 | |
75 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) | |
76 | continue; | |
77 | if (md->virt_addr == 0) | |
78 | return false; | |
79 | ||
f7d92489 AB |
80 | ret = efi_create_mapping(&efi_mm, md); |
81 | if (!ret) { | |
82 | pr_info(" EFI remap %pa => %p\n", | |
83 | &phys, (void *)(unsigned long)md->virt_addr); | |
84 | } else { | |
85 | pr_warn(" EFI remap %pa: failed to create mapping (%d)\n", | |
86 | &phys, ret); | |
87 | return false; | |
88 | } | |
14c43be6 AB |
89 | /* |
90 | * If this entry covers the address of the UEFI system table, | |
91 | * calculate and record its virtual address. | |
92 | */ | |
93 | if (efi_system_table >= phys && | |
94 | efi_system_table < phys + (md->num_pages * EFI_PAGE_SIZE)) { | |
95 | efi.systab = (void *)(unsigned long)(efi_system_table - | |
96 | phys + md->virt_addr); | |
97 | systab_found = true; | |
98 | } | |
e5bc22a4 | 99 | } |
789957ef | 100 | if (!systab_found) { |
14c43be6 | 101 | pr_err("No virtual mapping found for the UEFI System Table\n"); |
789957ef AB |
102 | return false; |
103 | } | |
104 | ||
105 | if (efi_memattr_apply_permissions(&efi_mm, efi_set_mapping_permissions)) | |
106 | return false; | |
107 | ||
108 | return true; | |
e5bc22a4 AB |
109 | } |
110 | ||
111 | /* | |
112 | * Enable the UEFI Runtime Services if all prerequisites are in place, i.e., | |
113 | * non-early mapping of the UEFI system table and virtual mappings for all | |
114 | * EFI_MEMORY_RUNTIME regions. | |
115 | */ | |
f7d92489 | 116 | static int __init arm_enable_runtime_services(void) |
e5bc22a4 AB |
117 | { |
118 | u64 mapsize; | |
119 | ||
120 | if (!efi_enabled(EFI_BOOT)) { | |
121 | pr_info("EFI services will not be available.\n"); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | if (efi_runtime_disabled()) { | |
126 | pr_info("EFI runtime services will be disabled.\n"); | |
127 | return 0; | |
128 | } | |
129 | ||
0cac5c30 SZ |
130 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
131 | pr_info("EFI runtime services access via paravirt.\n"); | |
132 | return 0; | |
133 | } | |
134 | ||
e5bc22a4 AB |
135 | pr_info("Remapping and enabling EFI services.\n"); |
136 | ||
9479c7ce | 137 | mapsize = efi.memmap.desc_size * efi.memmap.nr_map; |
884f4f66 | 138 | |
dca0f971 | 139 | if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) { |
e5bc22a4 AB |
140 | pr_err("Failed to remap EFI memory map\n"); |
141 | return -ENOMEM; | |
142 | } | |
e5bc22a4 | 143 | |
e5bc22a4 | 144 | if (!efi_virtmap_init()) { |
14c43be6 | 145 | pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n"); |
e5bc22a4 AB |
146 | return -ENOMEM; |
147 | } | |
148 | ||
149 | /* Set up runtime services function pointers */ | |
150 | efi_native_runtime_setup(); | |
151 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
152 | ||
e5bc22a4 AB |
153 | return 0; |
154 | } | |
f7d92489 | 155 | early_initcall(arm_enable_runtime_services); |
e5bc22a4 AB |
156 | |
157 | void efi_virtmap_load(void) | |
158 | { | |
159 | preempt_disable(); | |
160 | efi_set_pgd(&efi_mm); | |
161 | } | |
162 | ||
163 | void efi_virtmap_unload(void) | |
164 | { | |
165 | efi_set_pgd(current->active_mm); | |
166 | preempt_enable(); | |
167 | } |