| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * EFI initialization |
| * |
| * Author: Jianmin Lv <lvjianmin@loongson.cn> |
| * Huacai Chen <chenhuacai@loongson.cn> |
| * |
| * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/efi.h> |
| #include <linux/efi-bgrt.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/export.h> |
| #include <linux/io.h> |
| #include <linux/kobject.h> |
| #include <linux/memblock.h> |
| #include <linux/reboot.h> |
| #include <linux/uaccess.h> |
| |
| #include <asm/early_ioremap.h> |
| #include <asm/efi.h> |
| #include <asm/loongson.h> |
| |
| static unsigned long efi_nr_tables; |
| static unsigned long efi_config_table; |
| |
| static unsigned long __initdata boot_memmap = EFI_INVALID_TABLE_ADDR; |
| |
| static efi_system_table_t *efi_systab; |
| static efi_config_table_type_t arch_tables[] __initdata = { |
| {LINUX_EFI_BOOT_MEMMAP_GUID, &boot_memmap, "MEMMAP" }, |
| {}, |
| }; |
| |
| void __init efi_runtime_init(void) |
| { |
| if (!efi_enabled(EFI_BOOT)) |
| return; |
| |
| if (efi_runtime_disabled()) { |
| pr_info("EFI runtime services will be disabled.\n"); |
| return; |
| } |
| |
| efi.runtime = (efi_runtime_services_t *)efi_systab->runtime; |
| efi.runtime_version = (unsigned int)efi.runtime->hdr.revision; |
| |
| efi_native_runtime_setup(); |
| set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
| } |
| |
| unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR; |
| |
| static void __init init_screen_info(void) |
| { |
| struct screen_info *si; |
| |
| if (screen_info_table == EFI_INVALID_TABLE_ADDR) |
| return; |
| |
| 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)); |
| |
| memblock_reserve(screen_info.lfb_base, screen_info.lfb_size); |
| } |
| |
| void __init efi_init(void) |
| { |
| int size; |
| void *config_tables; |
| struct efi_boot_memmap *tbl; |
| |
| if (!efi_system_table) |
| return; |
| |
| efi_systab = (efi_system_table_t *)early_memremap_ro(efi_system_table, sizeof(*efi_systab)); |
| if (!efi_systab) { |
| pr_err("Can't find EFI system table.\n"); |
| return; |
| } |
| |
| efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor); |
| |
| set_bit(EFI_64BIT, &efi.flags); |
| efi_nr_tables = efi_systab->nr_tables; |
| efi_config_table = (unsigned long)efi_systab->tables; |
| |
| size = sizeof(efi_config_table_t); |
| config_tables = early_memremap(efi_config_table, efi_nr_tables * size); |
| efi_config_parse_tables(config_tables, efi_systab->nr_tables, arch_tables); |
| early_memunmap(config_tables, efi_nr_tables * size); |
| |
| set_bit(EFI_CONFIG_TABLES, &efi.flags); |
| |
| init_screen_info(); |
| |
| if (boot_memmap == EFI_INVALID_TABLE_ADDR) |
| return; |
| |
| tbl = early_memremap_ro(boot_memmap, sizeof(*tbl)); |
| if (tbl) { |
| struct efi_memory_map_data data; |
| |
| data.phys_map = boot_memmap + sizeof(*tbl); |
| data.size = tbl->map_size; |
| data.desc_size = tbl->desc_size; |
| data.desc_version = tbl->desc_ver; |
| |
| if (efi_memmap_init_early(&data) < 0) |
| panic("Unable to map EFI memory map.\n"); |
| |
| early_memunmap(tbl, sizeof(*tbl)); |
| } |
| } |