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![Daniel Drake](/assets/img/avatar_default.png)
The Intel Compute Stick STCK1A8LFC and Weibu F3C platforms both log 2 error messages during boot: efi: requested map not found. esrt: ESRT header is not in the memory map. Searching the web, this seems to affect many other platforms too. Since these messages are logged as errors, they appear on-screen during the boot process even when using the "quiet" boot parameter used by distros. Demote the ESRT error to a warning so that it does not appear on-screen, and delete the error logging from efi_mem_desc_lookup; both callsites of that function log more specific messages upon failure. Out of curiosity I looked closer at the Weibu F3C. There is no entry in the UEFI-provided memory map which corresponds to the ESRT pointer, but hacking the code to map it anyway, the ESRT does appear to be valid with 2 entries. Signed-off-by: Daniel Drake <drake@endlessm.com> Cc: Matt Fleming <matt@codeblueprint.co.uk> Acked-by: Peter Jones <pjones@redhat.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
899 lines
22 KiB
C
899 lines
22 KiB
C
/*
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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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* This file is released under the GPLv2.
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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/device.h>
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#include <linux/efi.h>
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#include <linux/of.h>
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#include <linux/of_fdt.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 <asm/early_ioremap.h>
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struct efi __read_mostly efi = {
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.mps = EFI_INVALID_TABLE_ADDR,
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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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.sal_systab = EFI_INVALID_TABLE_ADDR,
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.boot_info = EFI_INVALID_TABLE_ADDR,
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.hcdp = EFI_INVALID_TABLE_ADDR,
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.uga = EFI_INVALID_TABLE_ADDR,
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.uv_systab = EFI_INVALID_TABLE_ADDR,
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.fw_vendor = EFI_INVALID_TABLE_ADDR,
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.runtime = EFI_INVALID_TABLE_ADDR,
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.config_table = EFI_INVALID_TABLE_ADDR,
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.esrt = EFI_INVALID_TABLE_ADDR,
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.properties_table = EFI_INVALID_TABLE_ADDR,
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.mem_attr_table = EFI_INVALID_TABLE_ADDR,
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.rng_seed = EFI_INVALID_TABLE_ADDR,
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};
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EXPORT_SYMBOL(efi);
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static bool 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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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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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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*/
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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.mps != EFI_INVALID_TABLE_ADDR)
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str += sprintf(str, "MPS=0x%lx\n", efi.mps);
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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 (efi.hcdp != EFI_INVALID_TABLE_ADDR)
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str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
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if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
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str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info);
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if (efi.uga != EFI_INVALID_TABLE_ADDR)
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str += sprintf(str, "UGA=0x%lx\n", efi.uga);
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return str - buf;
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}
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static struct kobj_attribute efi_attr_systab =
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__ATTR(systab, 0400, systab_show, NULL);
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#define EFI_FIELD(var) efi.var
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#define EFI_ATTR_SHOW(name) \
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static ssize_t name##_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, "0x%lx\n", EFI_FIELD(name)); \
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}
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EFI_ATTR_SHOW(fw_vendor);
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EFI_ATTR_SHOW(runtime);
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EFI_ATTR_SHOW(config_table);
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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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static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
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static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
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static struct kobj_attribute efi_attr_config_table = __ATTR_RO(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_vendor.attr,
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&efi_attr_runtime.attr,
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&efi_attr_config_table.attr,
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&efi_attr_fw_platform_size.attr,
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NULL,
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};
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static umode_t efi_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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if (attr == &efi_attr_fw_vendor.attr) {
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if (efi_enabled(EFI_PARAVIRT) ||
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efi.fw_vendor == EFI_INVALID_TABLE_ADDR)
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return 0;
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} else if (attr == &efi_attr_runtime.attr) {
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if (efi.runtime == EFI_INVALID_TABLE_ADDR)
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return 0;
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} else if (attr == &efi_attr_config_table.attr) {
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if (efi.config_table == EFI_INVALID_TABLE_ADDR)
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return 0;
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}
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return attr->mode;
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}
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static 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 int generic_ops_register(void)
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{
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generic_ops.get_variable = efi.get_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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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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return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
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}
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static void generic_ops_unregister(void)
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{
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efivars_unregister(&generic_efivars);
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}
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#if IS_ENABLED(CONFIG_ACPI)
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#define EFIVAR_SSDT_NAME_MAX 16
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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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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 0;
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}
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__setup("efivar_ssdt=", efivar_ssdt_setup);
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static __init int efivar_ssdt_iter(efi_char16_t *name, efi_guid_t vendor,
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unsigned long name_size, void *data)
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{
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struct efivar_entry *entry;
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struct list_head *list = data;
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char utf8_name[EFIVAR_SSDT_NAME_MAX];
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int limit = min_t(unsigned long, 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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return 0;
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entry = kmalloc(sizeof(*entry), GFP_KERNEL);
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if (!entry)
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return 0;
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memcpy(entry->var.VariableName, name, name_size);
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memcpy(&entry->var.VendorGuid, &vendor, sizeof(efi_guid_t));
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efivar_entry_add(entry, list);
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return 0;
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}
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static __init int efivar_ssdt_load(void)
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{
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LIST_HEAD(entries);
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struct efivar_entry *entry, *aux;
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unsigned long size;
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void *data;
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int ret;
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ret = efivar_init(efivar_ssdt_iter, &entries, true, &entries);
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list_for_each_entry_safe(entry, aux, &entries, list) {
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pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt,
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&entry->var.VendorGuid);
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list_del(&entry->list);
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ret = efivar_entry_size(entry, &size);
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if (ret) {
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pr_err("failed to get var size\n");
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goto free_entry;
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}
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data = kmalloc(size, GFP_KERNEL);
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if (!data) {
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ret = -ENOMEM;
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goto free_entry;
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}
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ret = efivar_entry_get(entry, NULL, &size, data);
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if (ret) {
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pr_err("failed to get var data\n");
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goto free_data;
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}
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ret = acpi_load_table(data);
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if (ret) {
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pr_err("failed to load table: %d\n", ret);
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goto free_data;
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}
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goto free_entry;
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free_data:
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kfree(data);
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free_entry:
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kfree(entry);
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}
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return ret;
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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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/*
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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_BOOT))
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return 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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return -ENOMEM;
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}
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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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if (efi_enabled(EFI_RUNTIME_SERVICES))
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efivar_ssdt_load();
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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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error = efi_runtime_map_init(efi_kobj);
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if (error)
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goto err_remove_group;
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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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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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generic_ops_unregister();
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err_put:
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kobject_put(efi_kobj);
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return error;
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}
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subsys_initcall(efisubsys_init);
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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 __init efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
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{
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efi_memory_desc_t *md;
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if (!efi_enabled(EFI_MEMMAP)) {
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pr_err_once("EFI_MEMMAP is not enabled.\n");
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return -EINVAL;
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}
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if (!out_md) {
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pr_err_once("out_md is null.\n");
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return -EINVAL;
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}
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for_each_efi_memory_desc(md) {
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u64 size;
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u64 end;
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if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
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md->type != EFI_BOOT_SERVICES_DATA &&
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md->type != EFI_RUNTIME_SERVICES_DATA) {
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continue;
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}
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size = md->num_pages << EFI_PAGE_SHIFT;
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end = md->phys_addr + size;
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if (phys_addr >= md->phys_addr && phys_addr < end) {
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memcpy(out_md, md, sizeof(*out_md));
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return 0;
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}
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}
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return -ENOENT;
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}
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|
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/*
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* Calculate the highest address of an efi memory descriptor.
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*/
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u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
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{
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u64 size = md->num_pages << EFI_PAGE_SHIFT;
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u64 end = md->phys_addr + size;
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return end;
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}
|
|
|
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void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
|
|
|
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/**
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* efi_mem_reserve - Reserve an EFI memory region
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* @addr: Physical address to reserve
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* @size: Size of reservation
|
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*
|
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* Mark a region as reserved from general kernel allocation and
|
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* prevent it being released by efi_free_boot_services().
|
|
*
|
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* This function should be called drivers once they've parsed EFI
|
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* configuration tables to figure out where their data lives, e.g.
|
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* efi_esrt_init().
|
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*/
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void __init efi_mem_reserve(phys_addr_t addr, u64 size)
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|
{
|
|
if (!memblock_is_region_reserved(addr, size))
|
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memblock_reserve(addr, size);
|
|
|
|
/*
|
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* Some architectures (x86) reserve all boot services ranges
|
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* 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
|
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* ensure the @start, @size is not freed.
|
|
*/
|
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efi_arch_mem_reserve(addr, size);
|
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}
|
|
|
|
static __initdata efi_config_table_type_t common_tables[] = {
|
|
{ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
|
|
{ACPI_TABLE_GUID, "ACPI", &efi.acpi},
|
|
{HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
|
|
{MPS_TABLE_GUID, "MPS", &efi.mps},
|
|
{SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
|
|
{SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
|
|
{SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3},
|
|
{UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
|
|
{EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt},
|
|
{EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table},
|
|
{EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table},
|
|
{LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi.rng_seed},
|
|
{NULL_GUID, NULL, NULL},
|
|
};
|
|
|
|
static __init int match_config_table(efi_guid_t *guid,
|
|
unsigned long table,
|
|
efi_config_table_type_t *table_types)
|
|
{
|
|
int i;
|
|
|
|
if (table_types) {
|
|
for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
|
|
if (!efi_guidcmp(*guid, table_types[i].guid)) {
|
|
*(table_types[i].ptr) = table;
|
|
if (table_types[i].name)
|
|
pr_cont(" %s=0x%lx ",
|
|
table_types[i].name, table);
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init efi_config_parse_tables(void *config_tables, int count, int sz,
|
|
efi_config_table_type_t *arch_tables)
|
|
{
|
|
void *tablep;
|
|
int i;
|
|
|
|
tablep = config_tables;
|
|
pr_info("");
|
|
for (i = 0; i < count; i++) {
|
|
efi_guid_t guid;
|
|
unsigned long table;
|
|
|
|
if (efi_enabled(EFI_64BIT)) {
|
|
u64 table64;
|
|
guid = ((efi_config_table_64_t *)tablep)->guid;
|
|
table64 = ((efi_config_table_64_t *)tablep)->table;
|
|
table = table64;
|
|
#ifndef CONFIG_64BIT
|
|
if (table64 >> 32) {
|
|
pr_cont("\n");
|
|
pr_err("Table located above 4GB, disabling EFI.\n");
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
} else {
|
|
guid = ((efi_config_table_32_t *)tablep)->guid;
|
|
table = ((efi_config_table_32_t *)tablep)->table;
|
|
}
|
|
|
|
if (!match_config_table(&guid, table, common_tables))
|
|
match_config_table(&guid, table, arch_tables);
|
|
|
|
tablep += sz;
|
|
}
|
|
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 = seed->size;
|
|
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_device_randomness(seed->bits, seed->size);
|
|
early_memunmap(seed, sizeof(*seed) + size);
|
|
} else {
|
|
pr_err("Could not map UEFI random seed!\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
efi_memattr_init();
|
|
|
|
/* Parse the EFI Properties table if it exists */
|
|
if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {
|
|
efi_properties_table_t *tbl;
|
|
|
|
tbl = early_memremap(efi.properties_table, sizeof(*tbl));
|
|
if (tbl == NULL) {
|
|
pr_err("Could not map Properties table!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (tbl->memory_protection_attribute &
|
|
EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
|
|
set_bit(EFI_NX_PE_DATA, &efi.flags);
|
|
|
|
early_memunmap(tbl, sizeof(*tbl));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init efi_config_init(efi_config_table_type_t *arch_tables)
|
|
{
|
|
void *config_tables;
|
|
int sz, ret;
|
|
|
|
if (efi_enabled(EFI_64BIT))
|
|
sz = sizeof(efi_config_table_64_t);
|
|
else
|
|
sz = sizeof(efi_config_table_32_t);
|
|
|
|
/*
|
|
* Let's see what config tables the firmware passed to us.
|
|
*/
|
|
config_tables = early_memremap(efi.systab->tables,
|
|
efi.systab->nr_tables * sz);
|
|
if (config_tables == NULL) {
|
|
pr_err("Could not map Configuration table!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz,
|
|
arch_tables);
|
|
|
|
early_memunmap(config_tables, efi.systab->nr_tables * sz);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_EFI_VARS_MODULE
|
|
static int __init efi_load_efivars(void)
|
|
{
|
|
struct platform_device *pdev;
|
|
|
|
if (!efi_enabled(EFI_RUNTIME_SERVICES))
|
|
return 0;
|
|
|
|
pdev = platform_device_register_simple("efivars", 0, NULL, 0);
|
|
return IS_ERR(pdev) ? PTR_ERR(pdev) : 0;
|
|
}
|
|
device_initcall(efi_load_efivars);
|
|
#endif
|
|
|
|
#ifdef CONFIG_EFI_PARAMS_FROM_FDT
|
|
|
|
#define UEFI_PARAM(name, prop, field) \
|
|
{ \
|
|
{ name }, \
|
|
{ prop }, \
|
|
offsetof(struct efi_fdt_params, field), \
|
|
FIELD_SIZEOF(struct efi_fdt_params, field) \
|
|
}
|
|
|
|
struct params {
|
|
const char name[32];
|
|
const char propname[32];
|
|
int offset;
|
|
int size;
|
|
};
|
|
|
|
static __initdata struct params fdt_params[] = {
|
|
UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
|
|
UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
|
|
UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
|
|
UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
|
|
UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
|
|
};
|
|
|
|
static __initdata struct params xen_fdt_params[] = {
|
|
UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
|
|
UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
|
|
UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
|
|
UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
|
|
UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
|
|
};
|
|
|
|
#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params)
|
|
|
|
static __initdata struct {
|
|
const char *uname;
|
|
const char *subnode;
|
|
struct params *params;
|
|
} dt_params[] = {
|
|
{ "hypervisor", "uefi", xen_fdt_params },
|
|
{ "chosen", NULL, fdt_params },
|
|
};
|
|
|
|
struct param_info {
|
|
int found;
|
|
void *params;
|
|
const char *missing;
|
|
};
|
|
|
|
static int __init __find_uefi_params(unsigned long node,
|
|
struct param_info *info,
|
|
struct params *params)
|
|
{
|
|
const void *prop;
|
|
void *dest;
|
|
u64 val;
|
|
int i, len;
|
|
|
|
for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
|
|
prop = of_get_flat_dt_prop(node, params[i].propname, &len);
|
|
if (!prop) {
|
|
info->missing = params[i].name;
|
|
return 0;
|
|
}
|
|
|
|
dest = info->params + params[i].offset;
|
|
info->found++;
|
|
|
|
val = of_read_number(prop, len / sizeof(u32));
|
|
|
|
if (params[i].size == sizeof(u32))
|
|
*(u32 *)dest = val;
|
|
else
|
|
*(u64 *)dest = val;
|
|
|
|
if (efi_enabled(EFI_DBG))
|
|
pr_info(" %s: 0x%0*llx\n", params[i].name,
|
|
params[i].size * 2, val);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
struct param_info *info = data;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
|
|
const char *subnode = dt_params[i].subnode;
|
|
|
|
if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
|
|
info->missing = dt_params[i].params[0].name;
|
|
continue;
|
|
}
|
|
|
|
if (subnode) {
|
|
int err = of_get_flat_dt_subnode_by_name(node, subnode);
|
|
|
|
if (err < 0)
|
|
return 0;
|
|
|
|
node = err;
|
|
}
|
|
|
|
return __find_uefi_params(node, info, dt_params[i].params);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init efi_get_fdt_params(struct efi_fdt_params *params)
|
|
{
|
|
struct param_info info;
|
|
int ret;
|
|
|
|
pr_info("Getting EFI parameters from FDT:\n");
|
|
|
|
info.found = 0;
|
|
info.params = params;
|
|
|
|
ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
|
|
if (!info.found)
|
|
pr_info("UEFI not found.\n");
|
|
else if (!ret)
|
|
pr_err("Can't find '%s' in device tree!\n",
|
|
info.missing);
|
|
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_EFI_PARAMS_FROM_FDT */
|
|
|
|
static __initdata char memory_type_name[][20] = {
|
|
"Reserved",
|
|
"Loader Code",
|
|
"Loader Data",
|
|
"Boot Code",
|
|
"Boot Data",
|
|
"Runtime Code",
|
|
"Runtime Data",
|
|
"Conventional Memory",
|
|
"Unusable Memory",
|
|
"ACPI Reclaim Memory",
|
|
"ACPI Memory NVS",
|
|
"Memory Mapped I/O",
|
|
"MMIO Port Space",
|
|
"PAL Code",
|
|
"Persistent Memory",
|
|
};
|
|
|
|
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_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|%3s|%2s|%2s|%2s|%2s]",
|
|
attr & EFI_MEMORY_RUNTIME ? "RUN" : "",
|
|
attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "",
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* Despite being marked __weak, most architectures should *not*
|
|
* override this function. It is __weak solely for the benefit
|
|
* of ia64 which has a funky EFI memory map that doesn't work
|
|
* the same way as other architectures.
|
|
*/
|
|
u64 __weak 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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#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, 32U);
|
|
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 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
|