Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 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 | |
Ard Biesheuvel | 801820b | 2016-04-25 21:06:53 +0100 | [diff] [blame^] | 14 | #define pr_fmt(fmt) "efi: " fmt |
| 15 | |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 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> |
Ard Biesheuvel | 801820b | 2016-04-25 21:06:53 +0100 | [diff] [blame^] | 22 | #include <linux/screen_info.h> |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 23 | |
| 24 | #include <asm/efi.h> |
| 25 | |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 26 | u64 efi_system_table; |
| 27 | |
| 28 | static int __init is_normal_ram(efi_memory_desc_t *md) |
| 29 | { |
| 30 | if (md->attribute & EFI_MEMORY_WB) |
| 31 | return 1; |
| 32 | return 0; |
| 33 | } |
| 34 | |
| 35 | /* |
| 36 | * Translate a EFI virtual address into a physical address: this is necessary, |
| 37 | * as some data members of the EFI system table are virtually remapped after |
| 38 | * SetVirtualAddressMap() has been called. |
| 39 | */ |
| 40 | static phys_addr_t efi_to_phys(unsigned long addr) |
| 41 | { |
| 42 | efi_memory_desc_t *md; |
| 43 | |
Matt Fleming | 884f4f6 | 2016-04-25 21:06:39 +0100 | [diff] [blame] | 44 | for_each_efi_memory_desc(md) { |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 45 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) |
| 46 | continue; |
| 47 | if (md->virt_addr == 0) |
| 48 | /* no virtual mapping has been installed by the stub */ |
| 49 | break; |
| 50 | if (md->virt_addr <= addr && |
| 51 | (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT)) |
| 52 | return md->phys_addr + addr - md->virt_addr; |
| 53 | } |
| 54 | return addr; |
| 55 | } |
| 56 | |
Ard Biesheuvel | 801820b | 2016-04-25 21:06:53 +0100 | [diff] [blame^] | 57 | static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR; |
| 58 | |
| 59 | static __initdata efi_config_table_type_t arch_tables[] = { |
| 60 | {LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, NULL, &screen_info_table}, |
| 61 | {NULL_GUID, NULL, NULL} |
| 62 | }; |
| 63 | |
| 64 | static void __init init_screen_info(void) |
| 65 | { |
| 66 | struct screen_info *si; |
| 67 | |
| 68 | if (screen_info_table != EFI_INVALID_TABLE_ADDR) { |
| 69 | si = early_memremap_ro(screen_info_table, sizeof(*si)); |
| 70 | if (!si) { |
| 71 | pr_err("Could not map screen_info config table\n"); |
| 72 | return; |
| 73 | } |
| 74 | screen_info = *si; |
| 75 | early_memunmap(si, sizeof(*si)); |
| 76 | |
| 77 | /* dummycon on ARM needs non-zero values for columns/lines */ |
| 78 | screen_info.orig_video_cols = 80; |
| 79 | screen_info.orig_video_lines = 25; |
| 80 | } |
| 81 | } |
| 82 | |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 83 | static int __init uefi_init(void) |
| 84 | { |
| 85 | efi_char16_t *c16; |
| 86 | void *config_tables; |
Ard Biesheuvel | f7d9248 | 2015-11-30 13:28:19 +0100 | [diff] [blame] | 87 | size_t table_size; |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 88 | char vendor[100] = "unknown"; |
| 89 | int i, retval; |
| 90 | |
Ard Biesheuvel | 2eec5de | 2016-02-17 12:36:00 +0000 | [diff] [blame] | 91 | efi.systab = early_memremap_ro(efi_system_table, |
| 92 | sizeof(efi_system_table_t)); |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 93 | if (efi.systab == NULL) { |
| 94 | pr_warn("Unable to map EFI system table.\n"); |
| 95 | return -ENOMEM; |
| 96 | } |
| 97 | |
| 98 | set_bit(EFI_BOOT, &efi.flags); |
Ard Biesheuvel | f7d9248 | 2015-11-30 13:28:19 +0100 | [diff] [blame] | 99 | if (IS_ENABLED(CONFIG_64BIT)) |
| 100 | set_bit(EFI_64BIT, &efi.flags); |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 101 | |
| 102 | /* |
| 103 | * Verify the EFI Table |
| 104 | */ |
| 105 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
| 106 | pr_err("System table signature incorrect\n"); |
| 107 | retval = -EINVAL; |
| 108 | goto out; |
| 109 | } |
| 110 | if ((efi.systab->hdr.revision >> 16) < 2) |
| 111 | pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n", |
| 112 | efi.systab->hdr.revision >> 16, |
| 113 | efi.systab->hdr.revision & 0xffff); |
| 114 | |
Ard Biesheuvel | 14c43be | 2016-04-25 21:06:34 +0100 | [diff] [blame] | 115 | efi.runtime_version = efi.systab->hdr.revision; |
| 116 | |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 117 | /* Show what we know for posterity */ |
Ard Biesheuvel | 2eec5de | 2016-02-17 12:36:00 +0000 | [diff] [blame] | 118 | c16 = early_memremap_ro(efi_to_phys(efi.systab->fw_vendor), |
| 119 | sizeof(vendor) * sizeof(efi_char16_t)); |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 120 | if (c16) { |
| 121 | for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i) |
| 122 | vendor[i] = c16[i]; |
| 123 | vendor[i] = '\0'; |
| 124 | early_memunmap(c16, sizeof(vendor) * sizeof(efi_char16_t)); |
| 125 | } |
| 126 | |
| 127 | pr_info("EFI v%u.%.02u by %s\n", |
| 128 | efi.systab->hdr.revision >> 16, |
| 129 | efi.systab->hdr.revision & 0xffff, vendor); |
| 130 | |
| 131 | table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables; |
Ard Biesheuvel | 2eec5de | 2016-02-17 12:36:00 +0000 | [diff] [blame] | 132 | config_tables = early_memremap_ro(efi_to_phys(efi.systab->tables), |
| 133 | table_size); |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 134 | if (config_tables == NULL) { |
| 135 | pr_warn("Unable to map EFI config table array.\n"); |
| 136 | retval = -ENOMEM; |
| 137 | goto out; |
| 138 | } |
| 139 | retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables, |
Ard Biesheuvel | 801820b | 2016-04-25 21:06:53 +0100 | [diff] [blame^] | 140 | sizeof(efi_config_table_t), |
| 141 | arch_tables); |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 142 | |
| 143 | early_memunmap(config_tables, table_size); |
| 144 | out: |
| 145 | early_memunmap(efi.systab, sizeof(efi_system_table_t)); |
| 146 | return retval; |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * Return true for RAM regions we want to permanently reserve. |
| 151 | */ |
| 152 | static __init int is_reserve_region(efi_memory_desc_t *md) |
| 153 | { |
| 154 | switch (md->type) { |
| 155 | case EFI_LOADER_CODE: |
| 156 | case EFI_LOADER_DATA: |
| 157 | case EFI_BOOT_SERVICES_CODE: |
| 158 | case EFI_BOOT_SERVICES_DATA: |
| 159 | case EFI_CONVENTIONAL_MEMORY: |
| 160 | case EFI_PERSISTENT_MEMORY: |
| 161 | return 0; |
| 162 | default: |
| 163 | break; |
| 164 | } |
| 165 | return is_normal_ram(md); |
| 166 | } |
| 167 | |
| 168 | static __init void reserve_regions(void) |
| 169 | { |
| 170 | efi_memory_desc_t *md; |
| 171 | u64 paddr, npages, size; |
| 172 | |
| 173 | if (efi_enabled(EFI_DBG)) |
| 174 | pr_info("Processing EFI memory map:\n"); |
| 175 | |
Matt Fleming | 884f4f6 | 2016-04-25 21:06:39 +0100 | [diff] [blame] | 176 | for_each_efi_memory_desc(md) { |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 177 | paddr = md->phys_addr; |
| 178 | npages = md->num_pages; |
| 179 | |
| 180 | if (efi_enabled(EFI_DBG)) { |
| 181 | char buf[64]; |
| 182 | |
| 183 | pr_info(" 0x%012llx-0x%012llx %s", |
| 184 | paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1, |
| 185 | efi_md_typeattr_format(buf, sizeof(buf), md)); |
| 186 | } |
| 187 | |
| 188 | memrange_efi_to_native(&paddr, &npages); |
| 189 | size = npages << PAGE_SHIFT; |
| 190 | |
| 191 | if (is_normal_ram(md)) |
| 192 | early_init_dt_add_memory_arch(paddr, size); |
| 193 | |
| 194 | if (is_reserve_region(md)) { |
| 195 | memblock_mark_nomap(paddr, size); |
| 196 | if (efi_enabled(EFI_DBG)) |
| 197 | pr_cont("*"); |
| 198 | } |
| 199 | |
| 200 | if (efi_enabled(EFI_DBG)) |
| 201 | pr_cont("\n"); |
| 202 | } |
| 203 | |
| 204 | set_bit(EFI_MEMMAP, &efi.flags); |
| 205 | } |
| 206 | |
| 207 | void __init efi_init(void) |
| 208 | { |
| 209 | struct efi_fdt_params params; |
| 210 | |
| 211 | /* Grab UEFI information placed in FDT by stub */ |
| 212 | if (!efi_get_fdt_params(¶ms)) |
| 213 | return; |
| 214 | |
| 215 | efi_system_table = params.system_table; |
| 216 | |
Matt Fleming | 884f4f6 | 2016-04-25 21:06:39 +0100 | [diff] [blame] | 217 | efi.memmap.phys_map = params.mmap; |
| 218 | efi.memmap.map = early_memremap_ro(params.mmap, params.mmap_size); |
| 219 | if (efi.memmap.map == NULL) { |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 220 | /* |
| 221 | * If we are booting via UEFI, the UEFI memory map is the only |
| 222 | * description of memory we have, so there is little point in |
| 223 | * proceeding if we cannot access it. |
| 224 | */ |
| 225 | panic("Unable to map EFI memory map.\n"); |
| 226 | } |
Matt Fleming | 884f4f6 | 2016-04-25 21:06:39 +0100 | [diff] [blame] | 227 | efi.memmap.map_end = efi.memmap.map + params.mmap_size; |
| 228 | efi.memmap.desc_size = params.desc_size; |
| 229 | efi.memmap.desc_version = params.desc_ver; |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 230 | |
Ard Biesheuvel | 0d054ad | 2016-04-25 21:06:40 +0100 | [diff] [blame] | 231 | WARN(efi.memmap.desc_version != 1, |
| 232 | "Unexpected EFI_MEMORY_DESCRIPTOR version %ld", |
| 233 | efi.memmap.desc_version); |
| 234 | |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 235 | if (uefi_init() < 0) |
| 236 | return; |
| 237 | |
| 238 | reserve_regions(); |
Ard Biesheuvel | 789957e | 2016-04-25 21:06:46 +0100 | [diff] [blame] | 239 | efi_memattr_init(); |
Matt Fleming | 884f4f6 | 2016-04-25 21:06:39 +0100 | [diff] [blame] | 240 | early_memunmap(efi.memmap.map, params.mmap_size); |
Ard Biesheuvel | 7cc8cbc | 2016-03-30 09:46:23 +0200 | [diff] [blame] | 241 | |
| 242 | if (IS_ENABLED(CONFIG_ARM)) { |
| 243 | /* |
| 244 | * ARM currently does not allow ioremap_cache() to be called on |
| 245 | * memory regions that are covered by struct page. So remove the |
| 246 | * UEFI memory map from the linear mapping. |
| 247 | */ |
| 248 | memblock_mark_nomap(params.mmap & PAGE_MASK, |
| 249 | PAGE_ALIGN(params.mmap_size + |
| 250 | (params.mmap & ~PAGE_MASK))); |
| 251 | } else { |
| 252 | memblock_reserve(params.mmap & PAGE_MASK, |
| 253 | PAGE_ALIGN(params.mmap_size + |
| 254 | (params.mmap & ~PAGE_MASK))); |
| 255 | } |
Ard Biesheuvel | 801820b | 2016-04-25 21:06:53 +0100 | [diff] [blame^] | 256 | |
| 257 | init_screen_info(); |
Ard Biesheuvel | e5bc22a | 2015-11-30 13:28:18 +0100 | [diff] [blame] | 258 | } |