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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 | // SPDX-License-Identifier: GPL-2.0 /* * Extensible Firmware Interface * * Based on Extensible Firmware Interface Specification version 2.4 * * Copyright (C) 2013 - 2015 Linaro Ltd. */ #define pr_fmt(fmt) "efi: " fmt #include <linux/efi.h> #include <linux/fwnode.h> #include <linux/init.h> #include <linux/memblock.h> #include <linux/mm_types.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_fdt.h> #include <linux/platform_device.h> #include <linux/screen_info.h> #include <asm/efi.h> unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR; static int __init is_memory(efi_memory_desc_t *md) { if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC)) return 1; return 0; } /* * Translate a EFI virtual address into a physical address: this is necessary, * as some data members of the EFI system table are virtually remapped after * SetVirtualAddressMap() has been called. */ static phys_addr_t __init efi_to_phys(unsigned long addr) { efi_memory_desc_t *md; for_each_efi_memory_desc(md) { if (!(md->attribute & EFI_MEMORY_RUNTIME)) continue; if (md->virt_addr == 0) /* no virtual mapping has been installed by the stub */ break; if (md->virt_addr <= addr && (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT)) return md->phys_addr + addr - md->virt_addr; } return addr; } extern __weak const efi_config_table_type_t efi_arch_tables[]; static void __init init_screen_info(void) { struct screen_info *si; if (screen_info_table != EFI_INVALID_TABLE_ADDR) { si = early_memremap(screen_info_table, sizeof(*si)); if (!si) { pr_err("Could not map screen_info config table\n"); return; } screen_info = *si; memset(si, 0, sizeof(*si)); early_memunmap(si, sizeof(*si)); if (memblock_is_map_memory(screen_info.lfb_base)) memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size); if (IS_ENABLED(CONFIG_EFI_EARLYCON)) efi_earlycon_reprobe(); } } static int __init uefi_init(u64 efi_system_table) { efi_config_table_t *config_tables; efi_system_table_t *systab; size_t table_size; int retval; systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t)); if (systab == NULL) { pr_warn("Unable to map EFI system table.\n"); return -ENOMEM; } set_bit(EFI_BOOT, &efi.flags); if (IS_ENABLED(CONFIG_64BIT)) set_bit(EFI_64BIT, &efi.flags); retval = efi_systab_check_header(&systab->hdr, 2); if (retval) goto out; efi.runtime = systab->runtime; efi.runtime_version = systab->hdr.revision; efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor)); table_size = sizeof(efi_config_table_t) * systab->nr_tables; config_tables = early_memremap_ro(efi_to_phys(systab->tables), table_size); if (config_tables == NULL) { pr_warn("Unable to map EFI config table array.\n"); retval = -ENOMEM; goto out; } retval = efi_config_parse_tables(config_tables, systab->nr_tables, efi_arch_tables); early_memunmap(config_tables, table_size); out: early_memunmap(systab, sizeof(efi_system_table_t)); return retval; } /* * Return true for regions that can be used as System RAM. */ static __init int is_usable_memory(efi_memory_desc_t *md) { switch (md->type) { case EFI_LOADER_CODE: case EFI_LOADER_DATA: case EFI_ACPI_RECLAIM_MEMORY: case EFI_BOOT_SERVICES_CODE: case EFI_BOOT_SERVICES_DATA: case EFI_CONVENTIONAL_MEMORY: case EFI_PERSISTENT_MEMORY: /* * Special purpose memory is 'soft reserved', which means it * is set aside initially, but can be hotplugged back in or * be assigned to the dax driver after boot. */ if (efi_soft_reserve_enabled() && (md->attribute & EFI_MEMORY_SP)) return false; /* * According to the spec, these regions are no longer reserved * after calling ExitBootServices(). However, we can only use * them as System RAM if they can be mapped writeback cacheable. */ return (md->attribute & EFI_MEMORY_WB); default: break; } return false; } static __init void reserve_regions(void) { efi_memory_desc_t *md; u64 paddr, npages, size; if (efi_enabled(EFI_DBG)) pr_info("Processing EFI memory map:\n"); /* * Discard memblocks discovered so far: if there are any at this * point, they originate from memory nodes in the DT, and UEFI * uses its own memory map instead. */ memblock_dump_all(); memblock_remove(0, PHYS_ADDR_MAX); for_each_efi_memory_desc(md) { paddr = md->phys_addr; npages = md->num_pages; if (efi_enabled(EFI_DBG)) { char buf[64]; pr_info(" 0x%012llx-0x%012llx %s\n", paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1, efi_md_typeattr_format(buf, sizeof(buf), md)); } memrange_efi_to_native(&paddr, &npages); size = npages << PAGE_SHIFT; if (is_memory(md)) { early_init_dt_add_memory_arch(paddr, size); if (!is_usable_memory(md)) memblock_mark_nomap(paddr, size); /* keep ACPI reclaim memory intact for kexec etc. */ if (md->type == EFI_ACPI_RECLAIM_MEMORY) memblock_reserve(paddr, size); } } } void __init efi_init(void) { struct efi_memory_map_data data; u64 efi_system_table; /* Grab UEFI information placed in FDT by stub */ efi_system_table = efi_get_fdt_params(&data); if (!efi_system_table) return; if (efi_memmap_init_early(&data) < 0) { /* * If we are booting via UEFI, the UEFI memory map is the only * description of memory we have, so there is little point in * proceeding if we cannot access it. */ panic("Unable to map EFI memory map.\n"); } WARN(efi.memmap.desc_version != 1, "Unexpected EFI_MEMORY_DESCRIPTOR version %ld", efi.memmap.desc_version); if (uefi_init(efi_system_table) < 0) { efi_memmap_unmap(); return; } reserve_regions(); /* * For memblock manipulation, the cap should come after the memblock_add(). * And now, memblock is fully populated, it is time to do capping. */ early_init_dt_check_for_usable_mem_range(); efi_find_mirror(); efi_esrt_init(); efi_mokvar_table_init(); memblock_reserve(data.phys_map & PAGE_MASK, PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK))); init_screen_info(); } |