arch/loongarch/kernel/efi.c

// 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 efi_system_table_t *efi_systab;
static efi_config_table_type_t arch_tables[] __initdata = {{},};

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);
}

void __init efi_init(void)
{
	int size;
	void *config_tables;

	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;
	}

	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);
}