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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 - 2015 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> | |
15 | #include <linux/init.h> | |
16 | #include <linux/memblock.h> | |
17 | #include <linux/mm_types.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/of_fdt.h> | |
20 | ||
21 | #include <asm/efi.h> | |
22 | ||
23 | struct efi_memory_map memmap; | |
24 | ||
25 | u64 efi_system_table; | |
26 | ||
27 | static int __init is_normal_ram(efi_memory_desc_t *md) | |
28 | { | |
29 | if (md->attribute & EFI_MEMORY_WB) | |
30 | return 1; | |
31 | return 0; | |
32 | } | |
33 | ||
34 | /* | |
35 | * Translate a EFI virtual address into a physical address: this is necessary, | |
36 | * as some data members of the EFI system table are virtually remapped after | |
37 | * SetVirtualAddressMap() has been called. | |
38 | */ | |
39 | static phys_addr_t efi_to_phys(unsigned long addr) | |
40 | { | |
41 | efi_memory_desc_t *md; | |
42 | ||
43 | for_each_efi_memory_desc(&memmap, md) { | |
44 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) | |
45 | continue; | |
46 | if (md->virt_addr == 0) | |
47 | /* no virtual mapping has been installed by the stub */ | |
48 | break; | |
49 | if (md->virt_addr <= addr && | |
50 | (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT)) | |
51 | return md->phys_addr + addr - md->virt_addr; | |
52 | } | |
53 | return addr; | |
54 | } | |
55 | ||
56 | static int __init uefi_init(void) | |
57 | { | |
58 | efi_char16_t *c16; | |
59 | void *config_tables; | |
f7d92489 | 60 | size_t table_size; |
e5bc22a4 AB |
61 | char vendor[100] = "unknown"; |
62 | int i, retval; | |
63 | ||
2eec5ded AB |
64 | efi.systab = early_memremap_ro(efi_system_table, |
65 | sizeof(efi_system_table_t)); | |
e5bc22a4 AB |
66 | if (efi.systab == NULL) { |
67 | pr_warn("Unable to map EFI system table.\n"); | |
68 | return -ENOMEM; | |
69 | } | |
70 | ||
71 | set_bit(EFI_BOOT, &efi.flags); | |
f7d92489 AB |
72 | if (IS_ENABLED(CONFIG_64BIT)) |
73 | set_bit(EFI_64BIT, &efi.flags); | |
e5bc22a4 AB |
74 | |
75 | /* | |
76 | * Verify the EFI Table | |
77 | */ | |
78 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { | |
79 | pr_err("System table signature incorrect\n"); | |
80 | retval = -EINVAL; | |
81 | goto out; | |
82 | } | |
83 | if ((efi.systab->hdr.revision >> 16) < 2) | |
84 | pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n", | |
85 | efi.systab->hdr.revision >> 16, | |
86 | efi.systab->hdr.revision & 0xffff); | |
87 | ||
88 | /* Show what we know for posterity */ | |
2eec5ded AB |
89 | c16 = early_memremap_ro(efi_to_phys(efi.systab->fw_vendor), |
90 | sizeof(vendor) * sizeof(efi_char16_t)); | |
e5bc22a4 AB |
91 | if (c16) { |
92 | for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i) | |
93 | vendor[i] = c16[i]; | |
94 | vendor[i] = '\0'; | |
95 | early_memunmap(c16, sizeof(vendor) * sizeof(efi_char16_t)); | |
96 | } | |
97 | ||
98 | pr_info("EFI v%u.%.02u by %s\n", | |
99 | efi.systab->hdr.revision >> 16, | |
100 | efi.systab->hdr.revision & 0xffff, vendor); | |
101 | ||
102 | table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables; | |
2eec5ded AB |
103 | config_tables = early_memremap_ro(efi_to_phys(efi.systab->tables), |
104 | table_size); | |
e5bc22a4 AB |
105 | if (config_tables == NULL) { |
106 | pr_warn("Unable to map EFI config table array.\n"); | |
107 | retval = -ENOMEM; | |
108 | goto out; | |
109 | } | |
110 | retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables, | |
f7d92489 | 111 | sizeof(efi_config_table_t), NULL); |
e5bc22a4 AB |
112 | |
113 | early_memunmap(config_tables, table_size); | |
114 | out: | |
115 | early_memunmap(efi.systab, sizeof(efi_system_table_t)); | |
116 | return retval; | |
117 | } | |
118 | ||
119 | /* | |
120 | * Return true for RAM regions we want to permanently reserve. | |
121 | */ | |
122 | static __init int is_reserve_region(efi_memory_desc_t *md) | |
123 | { | |
124 | switch (md->type) { | |
125 | case EFI_LOADER_CODE: | |
126 | case EFI_LOADER_DATA: | |
127 | case EFI_BOOT_SERVICES_CODE: | |
128 | case EFI_BOOT_SERVICES_DATA: | |
129 | case EFI_CONVENTIONAL_MEMORY: | |
130 | case EFI_PERSISTENT_MEMORY: | |
131 | return 0; | |
132 | default: | |
133 | break; | |
134 | } | |
135 | return is_normal_ram(md); | |
136 | } | |
137 | ||
138 | static __init void reserve_regions(void) | |
139 | { | |
140 | efi_memory_desc_t *md; | |
141 | u64 paddr, npages, size; | |
142 | ||
143 | if (efi_enabled(EFI_DBG)) | |
144 | pr_info("Processing EFI memory map:\n"); | |
145 | ||
146 | for_each_efi_memory_desc(&memmap, md) { | |
147 | paddr = md->phys_addr; | |
148 | npages = md->num_pages; | |
149 | ||
150 | if (efi_enabled(EFI_DBG)) { | |
151 | char buf[64]; | |
152 | ||
153 | pr_info(" 0x%012llx-0x%012llx %s", | |
154 | paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1, | |
155 | efi_md_typeattr_format(buf, sizeof(buf), md)); | |
156 | } | |
157 | ||
158 | memrange_efi_to_native(&paddr, &npages); | |
159 | size = npages << PAGE_SHIFT; | |
160 | ||
161 | if (is_normal_ram(md)) | |
162 | early_init_dt_add_memory_arch(paddr, size); | |
163 | ||
164 | if (is_reserve_region(md)) { | |
165 | memblock_mark_nomap(paddr, size); | |
166 | if (efi_enabled(EFI_DBG)) | |
167 | pr_cont("*"); | |
168 | } | |
169 | ||
170 | if (efi_enabled(EFI_DBG)) | |
171 | pr_cont("\n"); | |
172 | } | |
173 | ||
174 | set_bit(EFI_MEMMAP, &efi.flags); | |
175 | } | |
176 | ||
177 | void __init efi_init(void) | |
178 | { | |
179 | struct efi_fdt_params params; | |
180 | ||
181 | /* Grab UEFI information placed in FDT by stub */ | |
182 | if (!efi_get_fdt_params(¶ms)) | |
183 | return; | |
184 | ||
185 | efi_system_table = params.system_table; | |
186 | ||
187 | memmap.phys_map = params.mmap; | |
2eec5ded | 188 | memmap.map = early_memremap_ro(params.mmap, params.mmap_size); |
e5bc22a4 AB |
189 | if (memmap.map == NULL) { |
190 | /* | |
191 | * If we are booting via UEFI, the UEFI memory map is the only | |
192 | * description of memory we have, so there is little point in | |
193 | * proceeding if we cannot access it. | |
194 | */ | |
195 | panic("Unable to map EFI memory map.\n"); | |
196 | } | |
197 | memmap.map_end = memmap.map + params.mmap_size; | |
198 | memmap.desc_size = params.desc_size; | |
199 | memmap.desc_version = params.desc_ver; | |
200 | ||
201 | if (uefi_init() < 0) | |
202 | return; | |
203 | ||
204 | reserve_regions(); | |
205 | early_memunmap(memmap.map, params.mmap_size); | |
7cc8cbcf AB |
206 | |
207 | if (IS_ENABLED(CONFIG_ARM)) { | |
208 | /* | |
209 | * ARM currently does not allow ioremap_cache() to be called on | |
210 | * memory regions that are covered by struct page. So remove the | |
211 | * UEFI memory map from the linear mapping. | |
212 | */ | |
213 | memblock_mark_nomap(params.mmap & PAGE_MASK, | |
214 | PAGE_ALIGN(params.mmap_size + | |
215 | (params.mmap & ~PAGE_MASK))); | |
216 | } else { | |
217 | memblock_reserve(params.mmap & PAGE_MASK, | |
218 | PAGE_ALIGN(params.mmap_size + | |
219 | (params.mmap & ~PAGE_MASK))); | |
220 | } | |
e5bc22a4 | 221 | } |