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/screen_info.h> 22 #include <linux/uaccess.h> 23 24 #include <asm/early_ioremap.h> 25 #include <asm/efi.h> 26 #include <asm/loongson.h> 27 28 static unsigned long efi_nr_tables; 29 static unsigned long efi_config_table; 30 31 static unsigned long __initdata boot_memmap = EFI_INVALID_TABLE_ADDR; 32 static unsigned long __initdata fdt_pointer = EFI_INVALID_TABLE_ADDR; 33 34 static efi_system_table_t *efi_systab; 35 static efi_config_table_type_t arch_tables[] __initdata = { 36 {LINUX_EFI_BOOT_MEMMAP_GUID, &boot_memmap, "MEMMAP" }, 37 {DEVICE_TREE_GUID, &fdt_pointer, "FDTPTR" }, 38 {}, 39 }; 40 41 void __init *efi_fdt_pointer(void) 42 { 43 if (!efi_systab) 44 return NULL; 45 46 if (fdt_pointer == EFI_INVALID_TABLE_ADDR) 47 return NULL; 48 49 return early_memremap_ro(fdt_pointer, SZ_64K); 50 } 51 52 void __init efi_runtime_init(void) 53 { 54 if (!efi_enabled(EFI_BOOT) || !efi_systab->runtime) 55 return; 56 57 if (efi_runtime_disabled()) { 58 pr_info("EFI runtime services will be disabled.\n"); 59 return; 60 } 61 62 efi.runtime = (efi_runtime_services_t *)efi_systab->runtime; 63 efi.runtime_version = (unsigned int)efi.runtime->hdr.revision; 64 65 efi_native_runtime_setup(); 66 set_bit(EFI_RUNTIME_SERVICES, &efi.flags); 67 } 68 69 unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR; 70 71 static void __init init_screen_info(void) 72 { 73 struct screen_info *si; 74 75 if (screen_info_table == EFI_INVALID_TABLE_ADDR) 76 return; 77 78 si = early_memremap(screen_info_table, sizeof(*si)); 79 if (!si) { 80 pr_err("Could not map screen_info config table\n"); 81 return; 82 } 83 screen_info = *si; 84 memset(si, 0, sizeof(*si)); 85 early_memunmap(si, sizeof(*si)); 86 87 memblock_reserve(screen_info.lfb_base, screen_info.lfb_size); 88 } 89 90 void __init efi_init(void) 91 { 92 int size; 93 void *config_tables; 94 struct efi_boot_memmap *tbl; 95 96 if (!efi_system_table) 97 return; 98 99 efi_systab = (efi_system_table_t *)early_memremap_ro(efi_system_table, sizeof(*efi_systab)); 100 if (!efi_systab) { 101 pr_err("Can't find EFI system table.\n"); 102 return; 103 } 104 105 efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor); 106 107 set_bit(EFI_64BIT, &efi.flags); 108 efi_nr_tables = efi_systab->nr_tables; 109 efi_config_table = (unsigned long)efi_systab->tables; 110 111 size = sizeof(efi_config_table_t); 112 config_tables = early_memremap(efi_config_table, efi_nr_tables * size); 113 efi_config_parse_tables(config_tables, efi_systab->nr_tables, arch_tables); 114 early_memunmap(config_tables, efi_nr_tables * size); 115 116 set_bit(EFI_CONFIG_TABLES, &efi.flags); 117 118 init_screen_info(); 119 120 if (boot_memmap == EFI_INVALID_TABLE_ADDR) 121 return; 122 123 tbl = early_memremap_ro(boot_memmap, sizeof(*tbl)); 124 if (tbl) { 125 struct efi_memory_map_data data; 126 127 data.phys_map = boot_memmap + sizeof(*tbl); 128 data.size = tbl->map_size; 129 data.desc_size = tbl->desc_size; 130 data.desc_version = tbl->desc_ver; 131 132 if (efi_memmap_init_early(&data) < 0) 133 panic("Unable to map EFI memory map.\n"); 134 135 early_memunmap(tbl, sizeof(*tbl)); 136 } 137 } 138