Commit | Line | Data |
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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 | ||
801820be AB |
14 | #define pr_fmt(fmt) "efi: " fmt |
15 | ||
e5bc22a4 AB |
16 | #include <linux/efi.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/memblock.h> | |
19 | #include <linux/mm_types.h> | |
20 | #include <linux/of.h> | |
21 | #include <linux/of_fdt.h> | |
e3271c96 | 22 | #include <linux/platform_device.h> |
801820be | 23 | #include <linux/screen_info.h> |
e5bc22a4 AB |
24 | |
25 | #include <asm/efi.h> | |
26 | ||
e5bc22a4 AB |
27 | u64 efi_system_table; |
28 | ||
29 | static int __init is_normal_ram(efi_memory_desc_t *md) | |
30 | { | |
31 | if (md->attribute & EFI_MEMORY_WB) | |
32 | return 1; | |
33 | return 0; | |
34 | } | |
35 | ||
36 | /* | |
37 | * Translate a EFI virtual address into a physical address: this is necessary, | |
38 | * as some data members of the EFI system table are virtually remapped after | |
39 | * SetVirtualAddressMap() has been called. | |
40 | */ | |
41 | static phys_addr_t efi_to_phys(unsigned long addr) | |
42 | { | |
43 | efi_memory_desc_t *md; | |
44 | ||
884f4f66 | 45 | for_each_efi_memory_desc(md) { |
e5bc22a4 AB |
46 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) |
47 | continue; | |
48 | if (md->virt_addr == 0) | |
49 | /* no virtual mapping has been installed by the stub */ | |
50 | break; | |
51 | if (md->virt_addr <= addr && | |
52 | (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT)) | |
53 | return md->phys_addr + addr - md->virt_addr; | |
54 | } | |
55 | return addr; | |
56 | } | |
57 | ||
801820be AB |
58 | static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR; |
59 | ||
60 | static __initdata efi_config_table_type_t arch_tables[] = { | |
61 | {LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, NULL, &screen_info_table}, | |
62 | {NULL_GUID, NULL, NULL} | |
63 | }; | |
64 | ||
65 | static void __init init_screen_info(void) | |
66 | { | |
67 | struct screen_info *si; | |
68 | ||
69 | if (screen_info_table != EFI_INVALID_TABLE_ADDR) { | |
70 | si = early_memremap_ro(screen_info_table, sizeof(*si)); | |
71 | if (!si) { | |
72 | pr_err("Could not map screen_info config table\n"); | |
73 | return; | |
74 | } | |
75 | screen_info = *si; | |
76 | early_memunmap(si, sizeof(*si)); | |
77 | ||
78 | /* dummycon on ARM needs non-zero values for columns/lines */ | |
79 | screen_info.orig_video_cols = 80; | |
80 | screen_info.orig_video_lines = 25; | |
81 | } | |
e3271c96 AB |
82 | |
83 | if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI && | |
84 | memblock_is_map_memory(screen_info.lfb_base)) | |
85 | memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size); | |
801820be AB |
86 | } |
87 | ||
e5bc22a4 AB |
88 | static int __init uefi_init(void) |
89 | { | |
90 | efi_char16_t *c16; | |
91 | void *config_tables; | |
f7d92489 | 92 | size_t table_size; |
e5bc22a4 AB |
93 | char vendor[100] = "unknown"; |
94 | int i, retval; | |
95 | ||
2eec5ded AB |
96 | efi.systab = early_memremap_ro(efi_system_table, |
97 | sizeof(efi_system_table_t)); | |
e5bc22a4 AB |
98 | if (efi.systab == NULL) { |
99 | pr_warn("Unable to map EFI system table.\n"); | |
100 | return -ENOMEM; | |
101 | } | |
102 | ||
103 | set_bit(EFI_BOOT, &efi.flags); | |
f7d92489 AB |
104 | if (IS_ENABLED(CONFIG_64BIT)) |
105 | set_bit(EFI_64BIT, &efi.flags); | |
e5bc22a4 AB |
106 | |
107 | /* | |
108 | * Verify the EFI Table | |
109 | */ | |
110 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { | |
111 | pr_err("System table signature incorrect\n"); | |
112 | retval = -EINVAL; | |
113 | goto out; | |
114 | } | |
115 | if ((efi.systab->hdr.revision >> 16) < 2) | |
116 | pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n", | |
117 | efi.systab->hdr.revision >> 16, | |
118 | efi.systab->hdr.revision & 0xffff); | |
119 | ||
14c43be6 AB |
120 | efi.runtime_version = efi.systab->hdr.revision; |
121 | ||
e5bc22a4 | 122 | /* Show what we know for posterity */ |
2eec5ded AB |
123 | c16 = early_memremap_ro(efi_to_phys(efi.systab->fw_vendor), |
124 | sizeof(vendor) * sizeof(efi_char16_t)); | |
e5bc22a4 AB |
125 | if (c16) { |
126 | for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i) | |
127 | vendor[i] = c16[i]; | |
128 | vendor[i] = '\0'; | |
129 | early_memunmap(c16, sizeof(vendor) * sizeof(efi_char16_t)); | |
130 | } | |
131 | ||
132 | pr_info("EFI v%u.%.02u by %s\n", | |
133 | efi.systab->hdr.revision >> 16, | |
134 | efi.systab->hdr.revision & 0xffff, vendor); | |
135 | ||
136 | table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables; | |
2eec5ded AB |
137 | config_tables = early_memremap_ro(efi_to_phys(efi.systab->tables), |
138 | table_size); | |
e5bc22a4 AB |
139 | if (config_tables == NULL) { |
140 | pr_warn("Unable to map EFI config table array.\n"); | |
141 | retval = -ENOMEM; | |
142 | goto out; | |
143 | } | |
144 | retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables, | |
801820be AB |
145 | sizeof(efi_config_table_t), |
146 | arch_tables); | |
e5bc22a4 AB |
147 | |
148 | early_memunmap(config_tables, table_size); | |
149 | out: | |
150 | early_memunmap(efi.systab, sizeof(efi_system_table_t)); | |
151 | return retval; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Return true for RAM regions we want to permanently reserve. | |
156 | */ | |
157 | static __init int is_reserve_region(efi_memory_desc_t *md) | |
158 | { | |
159 | switch (md->type) { | |
160 | case EFI_LOADER_CODE: | |
161 | case EFI_LOADER_DATA: | |
162 | case EFI_BOOT_SERVICES_CODE: | |
163 | case EFI_BOOT_SERVICES_DATA: | |
164 | case EFI_CONVENTIONAL_MEMORY: | |
165 | case EFI_PERSISTENT_MEMORY: | |
166 | return 0; | |
167 | default: | |
168 | break; | |
169 | } | |
170 | return is_normal_ram(md); | |
171 | } | |
172 | ||
173 | static __init void reserve_regions(void) | |
174 | { | |
175 | efi_memory_desc_t *md; | |
176 | u64 paddr, npages, size; | |
c7534397 | 177 | int resv; |
e5bc22a4 AB |
178 | |
179 | if (efi_enabled(EFI_DBG)) | |
180 | pr_info("Processing EFI memory map:\n"); | |
181 | ||
500899c2 AB |
182 | /* |
183 | * Discard memblocks discovered so far: if there are any at this | |
184 | * point, they originate from memory nodes in the DT, and UEFI | |
185 | * uses its own memory map instead. | |
186 | */ | |
187 | memblock_dump_all(); | |
7464b6e3 | 188 | memblock_remove(0, (phys_addr_t)ULLONG_MAX); |
500899c2 | 189 | |
884f4f66 | 190 | for_each_efi_memory_desc(md) { |
e5bc22a4 AB |
191 | paddr = md->phys_addr; |
192 | npages = md->num_pages; | |
193 | ||
c7534397 | 194 | resv = is_reserve_region(md); |
e5bc22a4 AB |
195 | if (efi_enabled(EFI_DBG)) { |
196 | char buf[64]; | |
197 | ||
c7534397 | 198 | pr_info(" 0x%012llx-0x%012llx %s%s\n", |
e5bc22a4 | 199 | paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1, |
c7534397 DC |
200 | efi_md_typeattr_format(buf, sizeof(buf), md), |
201 | resv ? "*" : ""); | |
e5bc22a4 AB |
202 | } |
203 | ||
204 | memrange_efi_to_native(&paddr, &npages); | |
205 | size = npages << PAGE_SHIFT; | |
206 | ||
207 | if (is_normal_ram(md)) | |
208 | early_init_dt_add_memory_arch(paddr, size); | |
209 | ||
c7534397 | 210 | if (resv) |
e5bc22a4 | 211 | memblock_mark_nomap(paddr, size); |
e5bc22a4 | 212 | |
e5bc22a4 AB |
213 | } |
214 | ||
215 | set_bit(EFI_MEMMAP, &efi.flags); | |
216 | } | |
217 | ||
218 | void __init efi_init(void) | |
219 | { | |
220 | struct efi_fdt_params params; | |
221 | ||
222 | /* Grab UEFI information placed in FDT by stub */ | |
223 | if (!efi_get_fdt_params(¶ms)) | |
224 | return; | |
225 | ||
226 | efi_system_table = params.system_table; | |
227 | ||
884f4f66 MF |
228 | efi.memmap.phys_map = params.mmap; |
229 | efi.memmap.map = early_memremap_ro(params.mmap, params.mmap_size); | |
230 | if (efi.memmap.map == NULL) { | |
e5bc22a4 AB |
231 | /* |
232 | * If we are booting via UEFI, the UEFI memory map is the only | |
233 | * description of memory we have, so there is little point in | |
234 | * proceeding if we cannot access it. | |
235 | */ | |
236 | panic("Unable to map EFI memory map.\n"); | |
237 | } | |
884f4f66 MF |
238 | efi.memmap.map_end = efi.memmap.map + params.mmap_size; |
239 | efi.memmap.desc_size = params.desc_size; | |
240 | efi.memmap.desc_version = params.desc_ver; | |
e5bc22a4 | 241 | |
0d054ad9 AB |
242 | WARN(efi.memmap.desc_version != 1, |
243 | "Unexpected EFI_MEMORY_DESCRIPTOR version %ld", | |
244 | efi.memmap.desc_version); | |
245 | ||
e5bc22a4 AB |
246 | if (uefi_init() < 0) |
247 | return; | |
248 | ||
249 | reserve_regions(); | |
789957ef | 250 | efi_memattr_init(); |
884f4f66 | 251 | early_memunmap(efi.memmap.map, params.mmap_size); |
7cc8cbcf | 252 | |
249f7632 AB |
253 | memblock_reserve(params.mmap & PAGE_MASK, |
254 | PAGE_ALIGN(params.mmap_size + | |
255 | (params.mmap & ~PAGE_MASK))); | |
801820be AB |
256 | |
257 | init_screen_info(); | |
e5bc22a4 | 258 | } |
e3271c96 AB |
259 | |
260 | static int __init register_gop_device(void) | |
261 | { | |
262 | void *pd; | |
263 | ||
264 | if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) | |
265 | return 0; | |
266 | ||
267 | pd = platform_device_register_data(NULL, "efi-framebuffer", 0, | |
268 | &screen_info, sizeof(screen_info)); | |
269 | return PTR_ERR_OR_ZERO(pd); | |
270 | } | |
271 | subsys_initcall(register_gop_device); |