menu "EFI (Extensible Firmware Interface) Support"
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depends on EFI
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config EFI_VARS
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tristate "EFI Variable Support via sysfs"
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depends on EFI
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default n
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help
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If you say Y here, you are able to get EFI (Extensible Firmware
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Interface) variable information via sysfs. You may read,
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write, create, and destroy EFI variables through this interface.
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Note that using this driver in concert with efibootmgr requires
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at least test release version 0.5.0-test3 or later, which is
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available from:
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<http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz>
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Subsequent efibootmgr releases may be found at:
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<http://github.com/vathpela/efibootmgr>
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config EFI_ESRT
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bool
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depends on EFI && !IA64
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default y
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config EFI_VARS_PSTORE
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tristate "Register efivars backend for pstore"
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depends on EFI_VARS && PSTORE
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default y
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help
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Say Y here to enable use efivars as a backend to pstore. This
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will allow writing console messages, crash dumps, or anything
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else supported by pstore to EFI variables.
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config EFI_VARS_PSTORE_DEFAULT_DISABLE
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bool "Disable using efivars as a pstore backend by default"
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depends on EFI_VARS_PSTORE
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default n
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help
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Saying Y here will disable the use of efivars as a storage
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backend for pstore by default. This setting can be overridden
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using the efivars module's pstore_disable parameter.
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config EFI_RUNTIME_MAP
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bool "Export efi runtime maps to sysfs"
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depends on X86 && EFI && KEXEC_CORE
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default y
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help
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Export efi runtime memory maps to /sys/firmware/efi/runtime-map.
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That memory map is used for example by kexec to set up efi virtual
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mapping the 2nd kernel, but can also be used for debugging purposes.
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See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
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config EFI_FAKE_MEMMAP
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bool "Enable EFI fake memory map"
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depends on EFI && X86
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default n
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help
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Saying Y here will enable "efi_fake_mem" boot option.
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By specifying this parameter, you can add arbitrary attribute
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to specific memory range by updating original (firmware provided)
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EFI memmap.
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This is useful for debugging of EFI memmap related feature.
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e.g. Address Range Mirroring feature.
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config EFI_MAX_FAKE_MEM
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int "maximum allowable number of ranges in efi_fake_mem boot option"
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depends on EFI_FAKE_MEMMAP
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range 1 128
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default 8
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help
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Maximum allowable number of ranges in efi_fake_mem boot option.
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Ranges can be set up to this value using comma-separated list.
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The default value is 8.
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config EFI_PARAMS_FROM_FDT
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bool
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help
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Select this config option from the architecture Kconfig if
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the EFI runtime support gets system table address, memory
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map address, and other parameters from the device tree.
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config EFI_RUNTIME_WRAPPERS
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bool
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config EFI_ARMSTUB
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bool
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config EFI_ARMSTUB_DTB_LOADER
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bool "Enable the DTB loader"
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depends on EFI_ARMSTUB
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default y
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help
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Select this config option to add support for the dtb= command
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line parameter, allowing a device tree blob to be loaded into
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memory from the EFI System Partition by the stub.
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If the device tree is provided by the platform or by
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the bootloader this option may not be needed.
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But, for various development reasons and to maintain existing
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functionality for bootloaders that do not have such support
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this option is necessary.
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config EFI_BOOTLOADER_CONTROL
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tristate "EFI Bootloader Control"
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depends on EFI_VARS
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default n
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---help---
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This module installs a reboot hook, such that if reboot() is
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invoked with a string argument NNN, "NNN" is copied to the
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"LoaderEntryOneShot" EFI variable, to be read by the
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bootloader. If the string matches one of the boot labels
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defined in its configuration, the bootloader will boot once
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to that label. The "LoaderEntryRebootReason" EFI variable is
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set with the reboot reason: "reboot" or "shutdown". The
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bootloader reads this reboot reason and takes particular
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action according to its policy.
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config EFI_CAPSULE_LOADER
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tristate "EFI capsule loader"
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depends on EFI
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help
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This option exposes a loader interface "/dev/efi_capsule_loader" for
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users to load EFI capsules. This driver requires working runtime
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capsule support in the firmware, which many OEMs do not provide.
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Most users should say N.
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config EFI_CAPSULE_QUIRK_QUARK_CSH
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bool "Add support for Quark capsules with non-standard headers"
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depends on X86 && !64BIT
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select EFI_CAPSULE_LOADER
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default y
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help
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Add support for processing Quark X1000 EFI capsules, whose header
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layout deviates from the layout mandated by the UEFI specification.
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config EFI_TEST
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tristate "EFI Runtime Service Tests Support"
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depends on EFI
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default n
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help
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This driver uses the efi.<service> function pointers directly instead
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of going through the efivar API, because it is not trying to test the
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kernel subsystem, just for testing the UEFI runtime service
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interfaces which are provided by the firmware. This driver is used
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by the Firmware Test Suite (FWTS) for testing the UEFI runtime
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interfaces readiness of the firmware.
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Details for FWTS are available from:
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<https://wiki.ubuntu.com/FirmwareTestSuite>
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Say Y here to enable the runtime services support via /dev/efi_test.
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If unsure, say N.
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config APPLE_PROPERTIES
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bool "Apple Device Properties"
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depends on EFI_STUB && X86
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select EFI_DEV_PATH_PARSER
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select UCS2_STRING
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help
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Retrieve properties from EFI on Apple Macs and assign them to
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devices, allowing for improved support of Apple hardware.
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Properties that would otherwise be missing include the
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Thunderbolt Device ROM and GPU configuration data.
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If unsure, say Y if you have a Mac. Otherwise N.
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config RESET_ATTACK_MITIGATION
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bool "Reset memory attack mitigation"
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depends on EFI_STUB
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help
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Request that the firmware clear the contents of RAM after a reboot
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using the TCG Platform Reset Attack Mitigation specification. This
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protects against an attacker forcibly rebooting the system while it
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still contains secrets in RAM, booting another OS and extracting the
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secrets. This should only be enabled when userland is configured to
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clear the MemoryOverwriteRequest flag on clean shutdown after secrets
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have been evicted, since otherwise it will trigger even on clean
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reboots.
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config EFI_CUSTOM_SSDT_OVERLAYS
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bool "Load custom ACPI SSDT overlay from an EFI variable"
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depends on EFI_VARS && ACPI
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default ACPI_TABLE_UPGRADE
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help
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Allow loading of an ACPI SSDT overlay from an EFI variable specified
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by a kernel command line option.
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See Documentation/admin-guide/acpi/ssdt-overlays.rst for more
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information.
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endmenu
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config UEFI_CPER
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bool
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config UEFI_CPER_ARM
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bool
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depends on UEFI_CPER && ( ARM || ARM64 )
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default y
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config UEFI_CPER_X86
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bool
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depends on UEFI_CPER && X86
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default y
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config EFI_DEV_PATH_PARSER
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bool
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depends on ACPI
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default n
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