1153 lines
29 KiB
C
1153 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* efi.c - EFI subsystem
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*
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* Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
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* Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
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* Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
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*
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* This code registers /sys/firmware/efi{,/efivars} when EFI is supported,
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* allowing the efivarfs to be mounted or the efivars module to be loaded.
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* The existance of /sys/firmware/efi may also be used by userspace to
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* determine that the system supports EFI.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kobject.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/efi.h>
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#include <linux/of.h>
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#include <linux/initrd.h>
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#include <linux/io.h>
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#include <linux/kexec.h>
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#include <linux/platform_device.h>
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#include <linux/random.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/ucs2_string.h>
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#include <linux/memblock.h>
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#include <linux/security.h>
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#include <asm/early_ioremap.h>
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struct efi __read_mostly efi = {
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.runtime_supported_mask = EFI_RT_SUPPORTED_ALL,
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.acpi = EFI_INVALID_TABLE_ADDR,
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.acpi20 = EFI_INVALID_TABLE_ADDR,
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.smbios = EFI_INVALID_TABLE_ADDR,
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.smbios3 = EFI_INVALID_TABLE_ADDR,
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.esrt = EFI_INVALID_TABLE_ADDR,
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.tpm_log = EFI_INVALID_TABLE_ADDR,
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.tpm_final_log = EFI_INVALID_TABLE_ADDR,
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#ifdef CONFIG_LOAD_UEFI_KEYS
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.mokvar_table = EFI_INVALID_TABLE_ADDR,
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#endif
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#ifdef CONFIG_EFI_COCO_SECRET
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.coco_secret = EFI_INVALID_TABLE_ADDR,
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#endif
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#ifdef CONFIG_UNACCEPTED_MEMORY
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.unaccepted = EFI_INVALID_TABLE_ADDR,
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#endif
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};
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EXPORT_SYMBOL(efi);
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unsigned long __ro_after_init efi_rng_seed = EFI_INVALID_TABLE_ADDR;
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static unsigned long __initdata mem_reserve = EFI_INVALID_TABLE_ADDR;
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static unsigned long __initdata rt_prop = EFI_INVALID_TABLE_ADDR;
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static unsigned long __initdata initrd = EFI_INVALID_TABLE_ADDR;
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extern unsigned long screen_info_table;
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struct mm_struct efi_mm = {
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.mm_mt = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, efi_mm.mmap_lock),
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.mm_users = ATOMIC_INIT(2),
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.mm_count = ATOMIC_INIT(1),
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.write_protect_seq = SEQCNT_ZERO(efi_mm.write_protect_seq),
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MMAP_LOCK_INITIALIZER(efi_mm)
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.page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
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.mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
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.cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0},
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};
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struct workqueue_struct *efi_rts_wq;
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static bool disable_runtime = IS_ENABLED(CONFIG_EFI_DISABLE_RUNTIME);
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static int __init setup_noefi(char *arg)
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{
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disable_runtime = true;
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return 0;
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}
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early_param("noefi", setup_noefi);
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bool efi_runtime_disabled(void)
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{
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return disable_runtime;
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}
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bool __pure __efi_soft_reserve_enabled(void)
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{
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return !efi_enabled(EFI_MEM_NO_SOFT_RESERVE);
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}
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static int __init parse_efi_cmdline(char *str)
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{
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if (!str) {
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pr_warn("need at least one option\n");
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return -EINVAL;
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}
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if (parse_option_str(str, "debug"))
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set_bit(EFI_DBG, &efi.flags);
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if (parse_option_str(str, "noruntime"))
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disable_runtime = true;
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if (parse_option_str(str, "runtime"))
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disable_runtime = false;
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if (parse_option_str(str, "nosoftreserve"))
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set_bit(EFI_MEM_NO_SOFT_RESERVE, &efi.flags);
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return 0;
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}
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early_param("efi", parse_efi_cmdline);
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struct kobject *efi_kobj;
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/*
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* Let's not leave out systab information that snuck into
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* the efivars driver
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* Note, do not add more fields in systab sysfs file as it breaks sysfs
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* one value per file rule!
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*/
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static ssize_t systab_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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char *str = buf;
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if (!kobj || !buf)
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return -EINVAL;
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if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
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str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
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if (efi.acpi != EFI_INVALID_TABLE_ADDR)
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str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
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/*
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* If both SMBIOS and SMBIOS3 entry points are implemented, the
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* SMBIOS3 entry point shall be preferred, so we list it first to
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* let applications stop parsing after the first match.
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*/
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if (efi.smbios3 != EFI_INVALID_TABLE_ADDR)
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str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3);
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if (efi.smbios != EFI_INVALID_TABLE_ADDR)
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str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
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if (IS_ENABLED(CONFIG_IA64) || IS_ENABLED(CONFIG_X86))
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str = efi_systab_show_arch(str);
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return str - buf;
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}
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static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400);
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static ssize_t fw_platform_size_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
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}
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extern __weak struct kobj_attribute efi_attr_fw_vendor;
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extern __weak struct kobj_attribute efi_attr_runtime;
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extern __weak struct kobj_attribute efi_attr_config_table;
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static struct kobj_attribute efi_attr_fw_platform_size =
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__ATTR_RO(fw_platform_size);
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static struct attribute *efi_subsys_attrs[] = {
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&efi_attr_systab.attr,
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&efi_attr_fw_platform_size.attr,
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&efi_attr_fw_vendor.attr,
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&efi_attr_runtime.attr,
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&efi_attr_config_table.attr,
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NULL,
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};
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umode_t __weak efi_attr_is_visible(struct kobject *kobj, struct attribute *attr,
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int n)
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{
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return attr->mode;
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}
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static const struct attribute_group efi_subsys_attr_group = {
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.attrs = efi_subsys_attrs,
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.is_visible = efi_attr_is_visible,
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};
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static struct efivars generic_efivars;
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static struct efivar_operations generic_ops;
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static bool generic_ops_supported(void)
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{
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unsigned long name_size;
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efi_status_t status;
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efi_char16_t name;
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efi_guid_t guid;
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name_size = sizeof(name);
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status = efi.get_next_variable(&name_size, &name, &guid);
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if (status == EFI_UNSUPPORTED)
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return false;
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return true;
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}
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static int generic_ops_register(void)
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{
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if (!generic_ops_supported())
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return 0;
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generic_ops.get_variable = efi.get_variable;
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generic_ops.get_next_variable = efi.get_next_variable;
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generic_ops.query_variable_store = efi_query_variable_store;
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generic_ops.query_variable_info = efi.query_variable_info;
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if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE)) {
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generic_ops.set_variable = efi.set_variable;
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generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking;
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}
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return efivars_register(&generic_efivars, &generic_ops);
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}
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static void generic_ops_unregister(void)
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{
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if (!generic_ops.get_variable)
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return;
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efivars_unregister(&generic_efivars);
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}
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#ifdef CONFIG_EFI_CUSTOM_SSDT_OVERLAYS
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#define EFIVAR_SSDT_NAME_MAX 16UL
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static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
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static int __init efivar_ssdt_setup(char *str)
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{
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int ret = security_locked_down(LOCKDOWN_ACPI_TABLES);
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if (ret)
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return ret;
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if (strlen(str) < sizeof(efivar_ssdt))
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memcpy(efivar_ssdt, str, strlen(str));
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else
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pr_warn("efivar_ssdt: name too long: %s\n", str);
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return 1;
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}
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__setup("efivar_ssdt=", efivar_ssdt_setup);
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static __init int efivar_ssdt_load(void)
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{
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unsigned long name_size = 256;
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efi_char16_t *name = NULL;
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efi_status_t status;
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efi_guid_t guid;
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if (!efivar_ssdt[0])
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return 0;
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name = kzalloc(name_size, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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for (;;) {
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char utf8_name[EFIVAR_SSDT_NAME_MAX];
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unsigned long data_size = 0;
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void *data;
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int limit;
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status = efi.get_next_variable(&name_size, name, &guid);
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if (status == EFI_NOT_FOUND) {
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break;
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} else if (status == EFI_BUFFER_TOO_SMALL) {
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name = krealloc(name, name_size, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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continue;
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}
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limit = min(EFIVAR_SSDT_NAME_MAX, name_size);
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ucs2_as_utf8(utf8_name, name, limit - 1);
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if (strncmp(utf8_name, efivar_ssdt, limit) != 0)
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continue;
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pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt, &guid);
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status = efi.get_variable(name, &guid, NULL, &data_size, NULL);
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if (status != EFI_BUFFER_TOO_SMALL || !data_size)
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return -EIO;
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data = kmalloc(data_size, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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status = efi.get_variable(name, &guid, NULL, &data_size, data);
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if (status == EFI_SUCCESS) {
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acpi_status ret = acpi_load_table(data, NULL);
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if (ret)
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pr_err("failed to load table: %u\n", ret);
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else
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continue;
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} else {
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pr_err("failed to get var data: 0x%lx\n", status);
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}
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kfree(data);
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}
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return 0;
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}
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#else
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static inline int efivar_ssdt_load(void) { return 0; }
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#endif
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#ifdef CONFIG_DEBUG_FS
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#define EFI_DEBUGFS_MAX_BLOBS 32
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static struct debugfs_blob_wrapper debugfs_blob[EFI_DEBUGFS_MAX_BLOBS];
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static void __init efi_debugfs_init(void)
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{
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struct dentry *efi_debugfs;
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efi_memory_desc_t *md;
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char name[32];
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int type_count[EFI_BOOT_SERVICES_DATA + 1] = {};
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int i = 0;
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efi_debugfs = debugfs_create_dir("efi", NULL);
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if (IS_ERR_OR_NULL(efi_debugfs))
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return;
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for_each_efi_memory_desc(md) {
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switch (md->type) {
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case EFI_BOOT_SERVICES_CODE:
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snprintf(name, sizeof(name), "boot_services_code%d",
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type_count[md->type]++);
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break;
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case EFI_BOOT_SERVICES_DATA:
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snprintf(name, sizeof(name), "boot_services_data%d",
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type_count[md->type]++);
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break;
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default:
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continue;
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}
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if (i >= EFI_DEBUGFS_MAX_BLOBS) {
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pr_warn("More then %d EFI boot service segments, only showing first %d in debugfs\n",
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EFI_DEBUGFS_MAX_BLOBS, EFI_DEBUGFS_MAX_BLOBS);
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break;
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}
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debugfs_blob[i].size = md->num_pages << EFI_PAGE_SHIFT;
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debugfs_blob[i].data = memremap(md->phys_addr,
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debugfs_blob[i].size,
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MEMREMAP_WB);
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if (!debugfs_blob[i].data)
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continue;
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debugfs_create_blob(name, 0400, efi_debugfs, &debugfs_blob[i]);
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i++;
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}
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}
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#else
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static inline void efi_debugfs_init(void) {}
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#endif
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/*
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* We register the efi subsystem with the firmware subsystem and the
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* efivars subsystem with the efi subsystem, if the system was booted with
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* EFI.
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*/
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static int __init efisubsys_init(void)
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{
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int error;
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if (!efi_enabled(EFI_RUNTIME_SERVICES))
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efi.runtime_supported_mask = 0;
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if (!efi_enabled(EFI_BOOT))
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return 0;
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if (efi.runtime_supported_mask) {
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/*
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* Since we process only one efi_runtime_service() at a time, an
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* ordered workqueue (which creates only one execution context)
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* should suffice for all our needs.
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*/
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efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0);
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if (!efi_rts_wq) {
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pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n");
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clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
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efi.runtime_supported_mask = 0;
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return 0;
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}
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}
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if (efi_rt_services_supported(EFI_RT_SUPPORTED_TIME_SERVICES))
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platform_device_register_simple("rtc-efi", 0, NULL, 0);
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/* We register the efi directory at /sys/firmware/efi */
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efi_kobj = kobject_create_and_add("efi", firmware_kobj);
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if (!efi_kobj) {
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pr_err("efi: Firmware registration failed.\n");
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error = -ENOMEM;
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goto err_destroy_wq;
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}
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if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
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EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) {
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error = generic_ops_register();
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if (error)
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goto err_put;
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efivar_ssdt_load();
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platform_device_register_simple("efivars", 0, NULL, 0);
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}
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error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
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if (error) {
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pr_err("efi: Sysfs attribute export failed with error %d.\n",
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error);
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goto err_unregister;
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}
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/* and the standard mountpoint for efivarfs */
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error = sysfs_create_mount_point(efi_kobj, "efivars");
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if (error) {
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pr_err("efivars: Subsystem registration failed.\n");
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goto err_remove_group;
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}
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if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS))
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efi_debugfs_init();
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#ifdef CONFIG_EFI_COCO_SECRET
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if (efi.coco_secret != EFI_INVALID_TABLE_ADDR)
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platform_device_register_simple("efi_secret", 0, NULL, 0);
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#endif
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return 0;
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err_remove_group:
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sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
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err_unregister:
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if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
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EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME))
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generic_ops_unregister();
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err_put:
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kobject_put(efi_kobj);
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efi_kobj = NULL;
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err_destroy_wq:
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if (efi_rts_wq)
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destroy_workqueue(efi_rts_wq);
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return error;
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}
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subsys_initcall(efisubsys_init);
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void __init efi_find_mirror(void)
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{
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efi_memory_desc_t *md;
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u64 mirror_size = 0, total_size = 0;
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if (!efi_enabled(EFI_MEMMAP))
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return;
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for_each_efi_memory_desc(md) {
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unsigned long long start = md->phys_addr;
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unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
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total_size += size;
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if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
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memblock_mark_mirror(start, size);
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mirror_size += size;
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}
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}
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if (mirror_size)
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pr_info("Memory: %lldM/%lldM mirrored memory\n",
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mirror_size>>20, total_size>>20);
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}
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|
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/*
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* Find the efi memory descriptor for a given physical address. Given a
|
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* physical address, determine if it exists within an EFI Memory Map entry,
|
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* and if so, populate the supplied memory descriptor with the appropriate
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* data.
|
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*/
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int __efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
|
|
{
|
|
efi_memory_desc_t *md;
|
|
|
|
if (!efi_enabled(EFI_MEMMAP)) {
|
|
pr_err_once("EFI_MEMMAP is not enabled.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!out_md) {
|
|
pr_err_once("out_md is null.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
for_each_efi_memory_desc(md) {
|
|
u64 size;
|
|
u64 end;
|
|
|
|
/* skip bogus entries (including empty ones) */
|
|
if ((md->phys_addr & (EFI_PAGE_SIZE - 1)) ||
|
|
(md->num_pages <= 0) ||
|
|
(md->num_pages > (U64_MAX - md->phys_addr) >> EFI_PAGE_SHIFT))
|
|
continue;
|
|
|
|
size = md->num_pages << EFI_PAGE_SHIFT;
|
|
end = md->phys_addr + size;
|
|
if (phys_addr >= md->phys_addr && phys_addr < end) {
|
|
memcpy(out_md, md, sizeof(*out_md));
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
extern int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
|
|
__weak __alias(__efi_mem_desc_lookup);
|
|
|
|
/*
|
|
* Calculate the highest address of an efi memory descriptor.
|
|
*/
|
|
u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
|
|
{
|
|
u64 size = md->num_pages << EFI_PAGE_SHIFT;
|
|
u64 end = md->phys_addr + size;
|
|
return end;
|
|
}
|
|
|
|
void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
|
|
|
|
/**
|
|
* efi_mem_reserve - Reserve an EFI memory region
|
|
* @addr: Physical address to reserve
|
|
* @size: Size of reservation
|
|
*
|
|
* Mark a region as reserved from general kernel allocation and
|
|
* prevent it being released by efi_free_boot_services().
|
|
*
|
|
* This function should be called drivers once they've parsed EFI
|
|
* configuration tables to figure out where their data lives, e.g.
|
|
* efi_esrt_init().
|
|
*/
|
|
void __init efi_mem_reserve(phys_addr_t addr, u64 size)
|
|
{
|
|
/* efi_mem_reserve() does not work under Xen */
|
|
if (WARN_ON_ONCE(efi_enabled(EFI_PARAVIRT)))
|
|
return;
|
|
|
|
if (!memblock_is_region_reserved(addr, size))
|
|
memblock_reserve(addr, size);
|
|
|
|
/*
|
|
* Some architectures (x86) reserve all boot services ranges
|
|
* until efi_free_boot_services() because of buggy firmware
|
|
* implementations. This means the above memblock_reserve() is
|
|
* superfluous on x86 and instead what it needs to do is
|
|
* ensure the @start, @size is not freed.
|
|
*/
|
|
efi_arch_mem_reserve(addr, size);
|
|
}
|
|
|
|
static const efi_config_table_type_t common_tables[] __initconst = {
|
|
{ACPI_20_TABLE_GUID, &efi.acpi20, "ACPI 2.0" },
|
|
{ACPI_TABLE_GUID, &efi.acpi, "ACPI" },
|
|
{SMBIOS_TABLE_GUID, &efi.smbios, "SMBIOS" },
|
|
{SMBIOS3_TABLE_GUID, &efi.smbios3, "SMBIOS 3.0" },
|
|
{EFI_SYSTEM_RESOURCE_TABLE_GUID, &efi.esrt, "ESRT" },
|
|
{EFI_MEMORY_ATTRIBUTES_TABLE_GUID, &efi_mem_attr_table, "MEMATTR" },
|
|
{LINUX_EFI_RANDOM_SEED_TABLE_GUID, &efi_rng_seed, "RNG" },
|
|
{LINUX_EFI_TPM_EVENT_LOG_GUID, &efi.tpm_log, "TPMEventLog" },
|
|
{LINUX_EFI_TPM_FINAL_LOG_GUID, &efi.tpm_final_log, "TPMFinalLog" },
|
|
{LINUX_EFI_MEMRESERVE_TABLE_GUID, &mem_reserve, "MEMRESERVE" },
|
|
{LINUX_EFI_INITRD_MEDIA_GUID, &initrd, "INITRD" },
|
|
{EFI_RT_PROPERTIES_TABLE_GUID, &rt_prop, "RTPROP" },
|
|
#ifdef CONFIG_EFI_RCI2_TABLE
|
|
{DELLEMC_EFI_RCI2_TABLE_GUID, &rci2_table_phys },
|
|
#endif
|
|
#ifdef CONFIG_LOAD_UEFI_KEYS
|
|
{LINUX_EFI_MOK_VARIABLE_TABLE_GUID, &efi.mokvar_table, "MOKvar" },
|
|
#endif
|
|
#ifdef CONFIG_EFI_COCO_SECRET
|
|
{LINUX_EFI_COCO_SECRET_AREA_GUID, &efi.coco_secret, "CocoSecret" },
|
|
#endif
|
|
#ifdef CONFIG_UNACCEPTED_MEMORY
|
|
{LINUX_EFI_UNACCEPTED_MEM_TABLE_GUID, &efi.unaccepted, "Unaccepted" },
|
|
#endif
|
|
#ifdef CONFIG_EFI_GENERIC_STUB
|
|
{LINUX_EFI_SCREEN_INFO_TABLE_GUID, &screen_info_table },
|
|
#endif
|
|
{},
|
|
};
|
|
|
|
static __init int match_config_table(const efi_guid_t *guid,
|
|
unsigned long table,
|
|
const efi_config_table_type_t *table_types)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
|
|
if (efi_guidcmp(*guid, table_types[i].guid))
|
|
continue;
|
|
|
|
if (!efi_config_table_is_usable(guid, table)) {
|
|
if (table_types[i].name[0])
|
|
pr_cont("(%s=0x%lx unusable) ",
|
|
table_types[i].name, table);
|
|
return 1;
|
|
}
|
|
|
|
*(table_types[i].ptr) = table;
|
|
if (table_types[i].name[0])
|
|
pr_cont("%s=0x%lx ", table_types[i].name, table);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init efi_config_parse_tables(const efi_config_table_t *config_tables,
|
|
int count,
|
|
const efi_config_table_type_t *arch_tables)
|
|
{
|
|
const efi_config_table_64_t *tbl64 = (void *)config_tables;
|
|
const efi_config_table_32_t *tbl32 = (void *)config_tables;
|
|
const efi_guid_t *guid;
|
|
unsigned long table;
|
|
int i;
|
|
|
|
pr_info("");
|
|
for (i = 0; i < count; i++) {
|
|
if (!IS_ENABLED(CONFIG_X86)) {
|
|
guid = &config_tables[i].guid;
|
|
table = (unsigned long)config_tables[i].table;
|
|
} else if (efi_enabled(EFI_64BIT)) {
|
|
guid = &tbl64[i].guid;
|
|
table = tbl64[i].table;
|
|
|
|
if (IS_ENABLED(CONFIG_X86_32) &&
|
|
tbl64[i].table > U32_MAX) {
|
|
pr_cont("\n");
|
|
pr_err("Table located above 4GB, disabling EFI.\n");
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
guid = &tbl32[i].guid;
|
|
table = tbl32[i].table;
|
|
}
|
|
|
|
if (!match_config_table(guid, table, common_tables) && arch_tables)
|
|
match_config_table(guid, table, arch_tables);
|
|
}
|
|
pr_cont("\n");
|
|
set_bit(EFI_CONFIG_TABLES, &efi.flags);
|
|
|
|
if (efi_rng_seed != EFI_INVALID_TABLE_ADDR) {
|
|
struct linux_efi_random_seed *seed;
|
|
u32 size = 0;
|
|
|
|
seed = early_memremap(efi_rng_seed, sizeof(*seed));
|
|
if (seed != NULL) {
|
|
size = min_t(u32, seed->size, SZ_1K); // sanity check
|
|
early_memunmap(seed, sizeof(*seed));
|
|
} else {
|
|
pr_err("Could not map UEFI random seed!\n");
|
|
}
|
|
if (size > 0) {
|
|
seed = early_memremap(efi_rng_seed,
|
|
sizeof(*seed) + size);
|
|
if (seed != NULL) {
|
|
add_bootloader_randomness(seed->bits, size);
|
|
memzero_explicit(seed->bits, size);
|
|
early_memunmap(seed, sizeof(*seed) + size);
|
|
} else {
|
|
pr_err("Could not map UEFI random seed!\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!IS_ENABLED(CONFIG_X86_32) && efi_enabled(EFI_MEMMAP))
|
|
efi_memattr_init();
|
|
|
|
efi_tpm_eventlog_init();
|
|
|
|
if (mem_reserve != EFI_INVALID_TABLE_ADDR) {
|
|
unsigned long prsv = mem_reserve;
|
|
|
|
while (prsv) {
|
|
struct linux_efi_memreserve *rsv;
|
|
u8 *p;
|
|
|
|
/*
|
|
* Just map a full page: that is what we will get
|
|
* anyway, and it permits us to map the entire entry
|
|
* before knowing its size.
|
|
*/
|
|
p = early_memremap(ALIGN_DOWN(prsv, PAGE_SIZE),
|
|
PAGE_SIZE);
|
|
if (p == NULL) {
|
|
pr_err("Could not map UEFI memreserve entry!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rsv = (void *)(p + prsv % PAGE_SIZE);
|
|
|
|
/* reserve the entry itself */
|
|
memblock_reserve(prsv,
|
|
struct_size(rsv, entry, rsv->size));
|
|
|
|
for (i = 0; i < atomic_read(&rsv->count); i++) {
|
|
memblock_reserve(rsv->entry[i].base,
|
|
rsv->entry[i].size);
|
|
}
|
|
|
|
prsv = rsv->next;
|
|
early_memunmap(p, PAGE_SIZE);
|
|
}
|
|
}
|
|
|
|
if (rt_prop != EFI_INVALID_TABLE_ADDR) {
|
|
efi_rt_properties_table_t *tbl;
|
|
|
|
tbl = early_memremap(rt_prop, sizeof(*tbl));
|
|
if (tbl) {
|
|
efi.runtime_supported_mask &= tbl->runtime_services_supported;
|
|
early_memunmap(tbl, sizeof(*tbl));
|
|
}
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) &&
|
|
initrd != EFI_INVALID_TABLE_ADDR && phys_initrd_size == 0) {
|
|
struct linux_efi_initrd *tbl;
|
|
|
|
tbl = early_memremap(initrd, sizeof(*tbl));
|
|
if (tbl) {
|
|
phys_initrd_start = tbl->base;
|
|
phys_initrd_size = tbl->size;
|
|
early_memunmap(tbl, sizeof(*tbl));
|
|
}
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) &&
|
|
efi.unaccepted != EFI_INVALID_TABLE_ADDR) {
|
|
struct efi_unaccepted_memory *unaccepted;
|
|
|
|
unaccepted = early_memremap(efi.unaccepted, sizeof(*unaccepted));
|
|
if (unaccepted) {
|
|
unsigned long size;
|
|
|
|
if (unaccepted->version == 1) {
|
|
size = sizeof(*unaccepted) + unaccepted->size;
|
|
memblock_reserve(efi.unaccepted, size);
|
|
} else {
|
|
efi.unaccepted = EFI_INVALID_TABLE_ADDR;
|
|
}
|
|
|
|
early_memunmap(unaccepted, sizeof(*unaccepted));
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init efi_systab_check_header(const efi_table_hdr_t *systab_hdr)
|
|
{
|
|
if (systab_hdr->signature != EFI_SYSTEM_TABLE_SIGNATURE) {
|
|
pr_err("System table signature incorrect!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifndef CONFIG_IA64
|
|
static const efi_char16_t *__init map_fw_vendor(unsigned long fw_vendor,
|
|
size_t size)
|
|
{
|
|
const efi_char16_t *ret;
|
|
|
|
ret = early_memremap_ro(fw_vendor, size);
|
|
if (!ret)
|
|
pr_err("Could not map the firmware vendor!\n");
|
|
return ret;
|
|
}
|
|
|
|
static void __init unmap_fw_vendor(const void *fw_vendor, size_t size)
|
|
{
|
|
early_memunmap((void *)fw_vendor, size);
|
|
}
|
|
#else
|
|
#define map_fw_vendor(p, s) __va(p)
|
|
#define unmap_fw_vendor(v, s)
|
|
#endif
|
|
|
|
void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr,
|
|
unsigned long fw_vendor)
|
|
{
|
|
char vendor[100] = "unknown";
|
|
const efi_char16_t *c16;
|
|
size_t i;
|
|
u16 rev;
|
|
|
|
c16 = map_fw_vendor(fw_vendor, sizeof(vendor) * sizeof(efi_char16_t));
|
|
if (c16) {
|
|
for (i = 0; i < sizeof(vendor) - 1 && c16[i]; ++i)
|
|
vendor[i] = c16[i];
|
|
vendor[i] = '\0';
|
|
|
|
unmap_fw_vendor(c16, sizeof(vendor) * sizeof(efi_char16_t));
|
|
}
|
|
|
|
rev = (u16)systab_hdr->revision;
|
|
pr_info("EFI v%u.%u", systab_hdr->revision >> 16, rev / 10);
|
|
|
|
rev %= 10;
|
|
if (rev)
|
|
pr_cont(".%u", rev);
|
|
|
|
pr_cont(" by %s\n", vendor);
|
|
|
|
if (IS_ENABLED(CONFIG_X86_64) &&
|
|
systab_hdr->revision > EFI_1_10_SYSTEM_TABLE_REVISION &&
|
|
!strcmp(vendor, "Apple")) {
|
|
pr_info("Apple Mac detected, using EFI v1.10 runtime services only\n");
|
|
efi.runtime_version = EFI_1_10_SYSTEM_TABLE_REVISION;
|
|
}
|
|
}
|
|
|
|
static __initdata char memory_type_name[][13] = {
|
|
"Reserved",
|
|
"Loader Code",
|
|
"Loader Data",
|
|
"Boot Code",
|
|
"Boot Data",
|
|
"Runtime Code",
|
|
"Runtime Data",
|
|
"Conventional",
|
|
"Unusable",
|
|
"ACPI Reclaim",
|
|
"ACPI Mem NVS",
|
|
"MMIO",
|
|
"MMIO Port",
|
|
"PAL Code",
|
|
"Persistent",
|
|
"Unaccepted",
|
|
};
|
|
|
|
char * __init efi_md_typeattr_format(char *buf, size_t size,
|
|
const efi_memory_desc_t *md)
|
|
{
|
|
char *pos;
|
|
int type_len;
|
|
u64 attr;
|
|
|
|
pos = buf;
|
|
if (md->type >= ARRAY_SIZE(memory_type_name))
|
|
type_len = snprintf(pos, size, "[type=%u", md->type);
|
|
else
|
|
type_len = snprintf(pos, size, "[%-*s",
|
|
(int)(sizeof(memory_type_name[0]) - 1),
|
|
memory_type_name[md->type]);
|
|
if (type_len >= size)
|
|
return buf;
|
|
|
|
pos += type_len;
|
|
size -= type_len;
|
|
|
|
attr = md->attribute;
|
|
if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT |
|
|
EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO |
|
|
EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP |
|
|
EFI_MEMORY_NV | EFI_MEMORY_SP | EFI_MEMORY_CPU_CRYPTO |
|
|
EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE))
|
|
snprintf(pos, size, "|attr=0x%016llx]",
|
|
(unsigned long long)attr);
|
|
else
|
|
snprintf(pos, size,
|
|
"|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",
|
|
attr & EFI_MEMORY_RUNTIME ? "RUN" : "",
|
|
attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "",
|
|
attr & EFI_MEMORY_CPU_CRYPTO ? "CC" : "",
|
|
attr & EFI_MEMORY_SP ? "SP" : "",
|
|
attr & EFI_MEMORY_NV ? "NV" : "",
|
|
attr & EFI_MEMORY_XP ? "XP" : "",
|
|
attr & EFI_MEMORY_RP ? "RP" : "",
|
|
attr & EFI_MEMORY_WP ? "WP" : "",
|
|
attr & EFI_MEMORY_RO ? "RO" : "",
|
|
attr & EFI_MEMORY_UCE ? "UCE" : "",
|
|
attr & EFI_MEMORY_WB ? "WB" : "",
|
|
attr & EFI_MEMORY_WT ? "WT" : "",
|
|
attr & EFI_MEMORY_WC ? "WC" : "",
|
|
attr & EFI_MEMORY_UC ? "UC" : "");
|
|
return buf;
|
|
}
|
|
|
|
/*
|
|
* IA64 has a funky EFI memory map that doesn't work the same way as
|
|
* other architectures.
|
|
*/
|
|
#ifndef CONFIG_IA64
|
|
/*
|
|
* efi_mem_attributes - lookup memmap attributes for physical address
|
|
* @phys_addr: the physical address to lookup
|
|
*
|
|
* Search in the EFI memory map for the region covering
|
|
* @phys_addr. Returns the EFI memory attributes if the region
|
|
* was found in the memory map, 0 otherwise.
|
|
*/
|
|
u64 efi_mem_attributes(unsigned long phys_addr)
|
|
{
|
|
efi_memory_desc_t *md;
|
|
|
|
if (!efi_enabled(EFI_MEMMAP))
|
|
return 0;
|
|
|
|
for_each_efi_memory_desc(md) {
|
|
if ((md->phys_addr <= phys_addr) &&
|
|
(phys_addr < (md->phys_addr +
|
|
(md->num_pages << EFI_PAGE_SHIFT))))
|
|
return md->attribute;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* efi_mem_type - lookup memmap type for physical address
|
|
* @phys_addr: the physical address to lookup
|
|
*
|
|
* Search in the EFI memory map for the region covering @phys_addr.
|
|
* Returns the EFI memory type if the region was found in the memory
|
|
* map, -EINVAL otherwise.
|
|
*/
|
|
int efi_mem_type(unsigned long phys_addr)
|
|
{
|
|
const efi_memory_desc_t *md;
|
|
|
|
if (!efi_enabled(EFI_MEMMAP))
|
|
return -ENOTSUPP;
|
|
|
|
for_each_efi_memory_desc(md) {
|
|
if ((md->phys_addr <= phys_addr) &&
|
|
(phys_addr < (md->phys_addr +
|
|
(md->num_pages << EFI_PAGE_SHIFT))))
|
|
return md->type;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
int efi_status_to_err(efi_status_t status)
|
|
{
|
|
int err;
|
|
|
|
switch (status) {
|
|
case EFI_SUCCESS:
|
|
err = 0;
|
|
break;
|
|
case EFI_INVALID_PARAMETER:
|
|
err = -EINVAL;
|
|
break;
|
|
case EFI_OUT_OF_RESOURCES:
|
|
err = -ENOSPC;
|
|
break;
|
|
case EFI_DEVICE_ERROR:
|
|
err = -EIO;
|
|
break;
|
|
case EFI_WRITE_PROTECTED:
|
|
err = -EROFS;
|
|
break;
|
|
case EFI_SECURITY_VIOLATION:
|
|
err = -EACCES;
|
|
break;
|
|
case EFI_NOT_FOUND:
|
|
err = -ENOENT;
|
|
break;
|
|
case EFI_ABORTED:
|
|
err = -EINTR;
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efi_status_to_err);
|
|
|
|
static DEFINE_SPINLOCK(efi_mem_reserve_persistent_lock);
|
|
static struct linux_efi_memreserve *efi_memreserve_root __ro_after_init;
|
|
|
|
static int __init efi_memreserve_map_root(void)
|
|
{
|
|
if (mem_reserve == EFI_INVALID_TABLE_ADDR)
|
|
return -ENODEV;
|
|
|
|
efi_memreserve_root = memremap(mem_reserve,
|
|
sizeof(*efi_memreserve_root),
|
|
MEMREMAP_WB);
|
|
if (WARN_ON_ONCE(!efi_memreserve_root))
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static int efi_mem_reserve_iomem(phys_addr_t addr, u64 size)
|
|
{
|
|
struct resource *res, *parent;
|
|
int ret;
|
|
|
|
res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
|
|
if (!res)
|
|
return -ENOMEM;
|
|
|
|
res->name = "reserved";
|
|
res->flags = IORESOURCE_MEM;
|
|
res->start = addr;
|
|
res->end = addr + size - 1;
|
|
|
|
/* we expect a conflict with a 'System RAM' region */
|
|
parent = request_resource_conflict(&iomem_resource, res);
|
|
ret = parent ? request_resource(parent, res) : 0;
|
|
|
|
/*
|
|
* Given that efi_mem_reserve_iomem() can be called at any
|
|
* time, only call memblock_reserve() if the architecture
|
|
* keeps the infrastructure around.
|
|
*/
|
|
if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK) && !ret)
|
|
memblock_reserve(addr, size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size)
|
|
{
|
|
struct linux_efi_memreserve *rsv;
|
|
unsigned long prsv;
|
|
int rc, index;
|
|
|
|
if (efi_memreserve_root == (void *)ULONG_MAX)
|
|
return -ENODEV;
|
|
|
|
if (!efi_memreserve_root) {
|
|
rc = efi_memreserve_map_root();
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
/* first try to find a slot in an existing linked list entry */
|
|
for (prsv = efi_memreserve_root->next; prsv; ) {
|
|
rsv = memremap(prsv, sizeof(*rsv), MEMREMAP_WB);
|
|
if (!rsv)
|
|
return -ENOMEM;
|
|
index = atomic_fetch_add_unless(&rsv->count, 1, rsv->size);
|
|
if (index < rsv->size) {
|
|
rsv->entry[index].base = addr;
|
|
rsv->entry[index].size = size;
|
|
|
|
memunmap(rsv);
|
|
return efi_mem_reserve_iomem(addr, size);
|
|
}
|
|
prsv = rsv->next;
|
|
memunmap(rsv);
|
|
}
|
|
|
|
/* no slot found - allocate a new linked list entry */
|
|
rsv = (struct linux_efi_memreserve *)__get_free_page(GFP_ATOMIC);
|
|
if (!rsv)
|
|
return -ENOMEM;
|
|
|
|
rc = efi_mem_reserve_iomem(__pa(rsv), SZ_4K);
|
|
if (rc) {
|
|
free_page((unsigned long)rsv);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* The memremap() call above assumes that a linux_efi_memreserve entry
|
|
* never crosses a page boundary, so let's ensure that this remains true
|
|
* even when kexec'ing a 4k pages kernel from a >4k pages kernel, by
|
|
* using SZ_4K explicitly in the size calculation below.
|
|
*/
|
|
rsv->size = EFI_MEMRESERVE_COUNT(SZ_4K);
|
|
atomic_set(&rsv->count, 1);
|
|
rsv->entry[0].base = addr;
|
|
rsv->entry[0].size = size;
|
|
|
|
spin_lock(&efi_mem_reserve_persistent_lock);
|
|
rsv->next = efi_memreserve_root->next;
|
|
efi_memreserve_root->next = __pa(rsv);
|
|
spin_unlock(&efi_mem_reserve_persistent_lock);
|
|
|
|
return efi_mem_reserve_iomem(addr, size);
|
|
}
|
|
|
|
static int __init efi_memreserve_root_init(void)
|
|
{
|
|
if (efi_memreserve_root)
|
|
return 0;
|
|
if (efi_memreserve_map_root())
|
|
efi_memreserve_root = (void *)ULONG_MAX;
|
|
return 0;
|
|
}
|
|
early_initcall(efi_memreserve_root_init);
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
static int update_efi_random_seed(struct notifier_block *nb,
|
|
unsigned long code, void *unused)
|
|
{
|
|
struct linux_efi_random_seed *seed;
|
|
u32 size = 0;
|
|
|
|
if (!kexec_in_progress)
|
|
return NOTIFY_DONE;
|
|
|
|
seed = memremap(efi_rng_seed, sizeof(*seed), MEMREMAP_WB);
|
|
if (seed != NULL) {
|
|
size = min(seed->size, EFI_RANDOM_SEED_SIZE);
|
|
memunmap(seed);
|
|
} else {
|
|
pr_err("Could not map UEFI random seed!\n");
|
|
}
|
|
if (size > 0) {
|
|
seed = memremap(efi_rng_seed, sizeof(*seed) + size,
|
|
MEMREMAP_WB);
|
|
if (seed != NULL) {
|
|
seed->size = size;
|
|
get_random_bytes(seed->bits, seed->size);
|
|
memunmap(seed);
|
|
} else {
|
|
pr_err("Could not map UEFI random seed!\n");
|
|
}
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block efi_random_seed_nb = {
|
|
.notifier_call = update_efi_random_seed,
|
|
};
|
|
|
|
static int __init register_update_efi_random_seed(void)
|
|
{
|
|
if (efi_rng_seed == EFI_INVALID_TABLE_ADDR)
|
|
return 0;
|
|
return register_reboot_notifier(&efi_random_seed_nb);
|
|
}
|
|
late_initcall(register_update_efi_random_seed);
|
|
#endif
|