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e688c22073
efi_shutdown_init() can register a general sys_off handler named efi_power_off(). Enable this by providing efi_poweroff_required(), like arm and x86. Since EFI poweroff is also supported on LoongArch, and the enablement makes the poweroff function usable for hardwares which lack ACPI S5. We prefer ACPI poweroff rather than EFI poweroff (like x86), so we only require EFI poweroff if acpi_gbl_reduced_hardware or acpi_no_s5 is true. Cc: stable@vger.kernel.org Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Miao Wang <shankerwangmiao@gmail.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
152 lines
3.6 KiB
C
152 lines
3.6 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/screen_info.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 unsigned long __initdata boot_memmap = EFI_INVALID_TABLE_ADDR;
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static unsigned long __initdata fdt_pointer = EFI_INVALID_TABLE_ADDR;
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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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{LINUX_EFI_BOOT_MEMMAP_GUID, &boot_memmap, "MEMMAP" },
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{DEVICE_TREE_GUID, &fdt_pointer, "FDTPTR" },
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{},
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};
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void __init *efi_fdt_pointer(void)
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{
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if (!efi_systab)
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return NULL;
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if (fdt_pointer == EFI_INVALID_TABLE_ADDR)
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return NULL;
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return early_memremap_ro(fdt_pointer, SZ_64K);
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}
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void __init efi_runtime_init(void)
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{
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if (!efi_enabled(EFI_BOOT) || !efi_systab->runtime)
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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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bool efi_poweroff_required(void)
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{
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return efi_enabled(EFI_RUNTIME_SERVICES) &&
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(acpi_gbl_reduced_hardware || acpi_no_s5);
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}
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unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
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#if defined(CONFIG_SYSFB) || defined(CONFIG_EFI_EARLYCON)
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struct screen_info screen_info __section(".data");
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EXPORT_SYMBOL_GPL(screen_info);
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#endif
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static void __init init_screen_info(void)
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{
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struct screen_info *si;
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if (screen_info_table == EFI_INVALID_TABLE_ADDR)
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return;
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si = early_memremap(screen_info_table, sizeof(*si));
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if (!si) {
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pr_err("Could not map screen_info config table\n");
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return;
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}
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screen_info = *si;
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memset(si, 0, sizeof(*si));
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early_memunmap(si, sizeof(*si));
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memblock_reserve(screen_info.lfb_base, screen_info.lfb_size);
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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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struct efi_boot_memmap *tbl;
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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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efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor);
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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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set_bit(EFI_CONFIG_TABLES, &efi.flags);
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if (IS_ENABLED(CONFIG_EFI_EARLYCON) || IS_ENABLED(CONFIG_SYSFB))
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init_screen_info();
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if (boot_memmap == EFI_INVALID_TABLE_ADDR)
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return;
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tbl = early_memremap_ro(boot_memmap, sizeof(*tbl));
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if (tbl) {
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struct efi_memory_map_data data;
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data.phys_map = boot_memmap + sizeof(*tbl);
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data.size = tbl->map_size;
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data.desc_size = tbl->desc_size;
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data.desc_version = tbl->desc_ver;
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if (efi_memmap_init_early(&data) < 0)
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panic("Unable to map EFI memory map.\n");
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early_memunmap(tbl, sizeof(*tbl));
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}
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efi_esrt_init();
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}
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