1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * EFI initialization 4 * 5 * Author: Jianmin Lv <lvjianmin@loongson.cn> 6 * Huacai Chen <chenhuacai@loongson.cn> 7 * 8 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 9 */ 10 11 #include <linux/acpi.h> 12 #include <linux/efi.h> 13 #include <linux/efi-bgrt.h> 14 #include <linux/init.h> 15 #include <linux/kernel.h> 16 #include <linux/export.h> 17 #include <linux/io.h> 18 #include <linux/kobject.h> 19 #include <linux/memblock.h> 20 #include <linux/reboot.h> 21 #include <linux/uaccess.h> 22 23 #include <asm/early_ioremap.h> 24 #include <asm/efi.h> 25 #include <asm/loongson.h> 26 27 static unsigned long efi_nr_tables; 28 static unsigned long efi_config_table; 29 30 static unsigned long __initdata boot_memmap = EFI_INVALID_TABLE_ADDR; 31 static unsigned long __initdata fdt_pointer = EFI_INVALID_TABLE_ADDR; 32 33 static efi_system_table_t *efi_systab; 34 static efi_config_table_type_t arch_tables[] __initdata = { 35 {LINUX_EFI_BOOT_MEMMAP_GUID, &boot_memmap, "MEMMAP" }, 36 {DEVICE_TREE_GUID, &fdt_pointer, "FDTPTR" }, 37 {}, 38 }; 39 40 void __init *efi_fdt_pointer(void) 41 { 42 if (!efi_systab) 43 return NULL; 44 45 if (fdt_pointer == EFI_INVALID_TABLE_ADDR) 46 return NULL; 47 48 return early_memremap_ro(fdt_pointer, SZ_64K); 49 } 50 51 void __init efi_runtime_init(void) 52 { 53 if (!efi_enabled(EFI_BOOT) || !efi_systab->runtime) 54 return; 55 56 if (efi_runtime_disabled()) { 57 pr_info("EFI runtime services will be disabled.\n"); 58 return; 59 } 60 61 efi.runtime = (efi_runtime_services_t *)efi_systab->runtime; 62 efi.runtime_version = (unsigned int)efi.runtime->hdr.revision; 63 64 efi_native_runtime_setup(); 65 set_bit(EFI_RUNTIME_SERVICES, &efi.flags); 66 } 67 68 unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR; 69 70 static void __init init_screen_info(void) 71 { 72 struct screen_info *si; 73 74 if (screen_info_table == EFI_INVALID_TABLE_ADDR) 75 return; 76 77 si = early_memremap(screen_info_table, sizeof(*si)); 78 if (!si) { 79 pr_err("Could not map screen_info config table\n"); 80 return; 81 } 82 screen_info = *si; 83 memset(si, 0, sizeof(*si)); 84 early_memunmap(si, sizeof(*si)); 85 86 memblock_reserve(screen_info.lfb_base, screen_info.lfb_size); 87 } 88 89 void __init efi_init(void) 90 { 91 int size; 92 void *config_tables; 93 struct efi_boot_memmap *tbl; 94 95 if (!efi_system_table) 96 return; 97 98 efi_systab = (efi_system_table_t *)early_memremap_ro(efi_system_table, sizeof(*efi_systab)); 99 if (!efi_systab) { 100 pr_err("Can't find EFI system table.\n"); 101 return; 102 } 103 104 efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor); 105 106 set_bit(EFI_64BIT, &efi.flags); 107 efi_nr_tables = efi_systab->nr_tables; 108 efi_config_table = (unsigned long)efi_systab->tables; 109 110 size = sizeof(efi_config_table_t); 111 config_tables = early_memremap(efi_config_table, efi_nr_tables * size); 112 efi_config_parse_tables(config_tables, efi_systab->nr_tables, arch_tables); 113 early_memunmap(config_tables, efi_nr_tables * size); 114 115 set_bit(EFI_CONFIG_TABLES, &efi.flags); 116 117 init_screen_info(); 118 119 if (boot_memmap == EFI_INVALID_TABLE_ADDR) 120 return; 121 122 tbl = early_memremap_ro(boot_memmap, sizeof(*tbl)); 123 if (tbl) { 124 struct efi_memory_map_data data; 125 126 data.phys_map = boot_memmap + sizeof(*tbl); 127 data.size = tbl->map_size; 128 data.desc_size = tbl->desc_size; 129 data.desc_version = tbl->desc_ver; 130 131 if (efi_memmap_init_early(&data) < 0) 132 panic("Unable to map EFI memory map.\n"); 133 134 early_memunmap(tbl, sizeof(*tbl)); 135 } 136 } 137