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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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628c3bb40e
Add basic boot, setup and reset routines for LoongArch. Now, LoongArch machines use UEFI-based firmware. The firmware passes configuration information to the kernel via ACPI and DMI/SMBIOS. Currently an existing interface between the kernel and the bootloader is implemented. Kernel gets 2 values from the bootloader, passed in registers a0 and a1; a0 is an "EFI boot flag" distinguishing UEFI and non-UEFI firmware, while a1 is a pointer to an FDT with systable, memmap, cmdline and initrd information. The standard UEFI boot protocol (EFISTUB) will be added later. Cc: linux-efi@vger.kernel.org Cc: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Co-developed-by: Yun Liu <liuyun@loongson.cn> Signed-off-by: Yun Liu <liuyun@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* EFI initialization
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*
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* Author: Jianmin Lv <lvjianmin@loongson.cn>
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* Huacai Chen <chenhuacai@loongson.cn>
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*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <linux/acpi.h>
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#include <linux/efi.h>
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#include <linux/efi-bgrt.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/io.h>
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#include <linux/kobject.h>
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#include <linux/memblock.h>
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#include <linux/reboot.h>
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#include <linux/uaccess.h>
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#include <asm/early_ioremap.h>
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#include <asm/efi.h>
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#include <asm/loongson.h>
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static unsigned long efi_nr_tables;
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static unsigned long efi_config_table;
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static efi_system_table_t *efi_systab;
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static efi_config_table_type_t arch_tables[] __initdata = {{},};
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void __init efi_runtime_init(void)
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{
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if (!efi_enabled(EFI_BOOT))
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return;
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if (efi_runtime_disabled()) {
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pr_info("EFI runtime services will be disabled.\n");
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return;
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}
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efi.runtime = (efi_runtime_services_t *)efi_systab->runtime;
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efi.runtime_version = (unsigned int)efi.runtime->hdr.revision;
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efi_native_runtime_setup();
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set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
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}
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void __init efi_init(void)
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{
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int size;
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void *config_tables;
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if (!efi_system_table)
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return;
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efi_systab = (efi_system_table_t *)early_memremap_ro(efi_system_table, sizeof(*efi_systab));
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if (!efi_systab) {
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pr_err("Can't find EFI system table.\n");
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return;
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}
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set_bit(EFI_64BIT, &efi.flags);
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efi_nr_tables = efi_systab->nr_tables;
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efi_config_table = (unsigned long)efi_systab->tables;
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size = sizeof(efi_config_table_t);
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config_tables = early_memremap(efi_config_table, efi_nr_tables * size);
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efi_config_parse_tables(config_tables, efi_systab->nr_tables, arch_tables);
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early_memunmap(config_tables, efi_nr_tables * size);
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}
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