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36a237526c
CONFIG_EFI_EARLYCON defaults to yes, and thus is enabled on systems that
do not support EFI, or do not have EFI support enabled, but do satisfy
the symbol's other dependencies.
While drivers/firmware/efi/ won't be entered during the build phase if
CONFIG_EFI=n, and drivers/firmware/efi/earlycon.c itself thus won't be
built, enabling EFI_EARLYCON does force-enable CONFIG_FONT_SUPPORT and
CONFIG_ARCH_USE_MEMREMAP_PROT, and CONFIG_FONT_8x16, which is
undesirable.
Fix this by making CONFIG_EFI_EARLYCON depend on CONFIG_EFI.
This reduces kernel size on headless systems by more than 4 KiB.
Fixes: 69c1f396f2 ("efi/x86: Convert x86 EFI earlyprintk into generic earlycon implementation")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20201124191646.3559757-1-geert@linux-m68k.org
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
287 lines
9.8 KiB
Plaintext
287 lines
9.8 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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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 && (X86 || IA64)
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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 this driver is only retained for compatibility with
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legacy users: new users should use the efivarfs filesystem
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instead.
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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 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_SOFT_RESERVE
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bool "Reserve EFI Specific Purpose Memory"
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depends on EFI && EFI_STUB && ACPI_HMAT
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default ACPI_HMAT
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help
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On systems that have mixed performance classes of memory EFI
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may indicate specific purpose memory with an attribute (See
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EFI_MEMORY_SP in UEFI 2.8). A memory range tagged with this
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attribute may have unique performance characteristics compared
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to the system's general purpose "System RAM" pool. On the
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expectation that such memory has application specific usage,
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and its base EFI memory type is "conventional" answer Y to
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arrange for the kernel to reserve it as a "Soft Reserved"
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resource, and set aside for direct-access (device-dax) by
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default. The memory range can later be optionally assigned to
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the page allocator by system administrator policy via the
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device-dax kmem facility. Say N to have the kernel treat this
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memory as "System RAM" by default.
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If unsure, say Y.
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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_GENERIC_STUB
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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_GENERIC_STUB && !RISCV
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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_GENERIC_STUB_INITRD_CMDLINE_LOADER
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bool "Enable the command line initrd loader" if !X86
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depends on EFI_STUB && (EFI_GENERIC_STUB || X86)
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default y
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depends on !RISCV
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help
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Select this config option to add support for the initrd= command
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line parameter, allowing an initrd that resides on the same volume
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as the kernel image to be loaded into memory.
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This method is deprecated.
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config EFI_BOOTLOADER_CONTROL
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tristate "EFI Bootloader Control"
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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_RCI2_TABLE
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bool "EFI Runtime Configuration Interface Table Version 2 Support"
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depends on X86 || COMPILE_TEST
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help
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Displays the content of the Runtime Configuration Interface
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Table version 2 on Dell EMC PowerEdge systems as a binary
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attribute 'rci2' under /sys/firmware/efi/tables directory.
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RCI2 table contains BIOS HII in XML format and is used to populate
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BIOS setup page in Dell EMC OpenManage Server Administrator tool.
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The BIOS setup page contains BIOS tokens which can be configured.
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Say Y here for Dell EMC PowerEdge systems.
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config EFI_DISABLE_PCI_DMA
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bool "Clear Busmaster bit on PCI bridges during ExitBootServices()"
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help
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Disable the busmaster bit in the control register on all PCI bridges
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while calling ExitBootServices() and passing control to the runtime
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kernel. System firmware may configure the IOMMU to prevent malicious
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PCI devices from being able to attack the OS via DMA. However, since
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firmware can't guarantee that the OS is IOMMU-aware, it will tear
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down IOMMU configuration when ExitBootServices() is called. This
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leaves a window between where a hostile device could still cause
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damage before Linux configures the IOMMU again.
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If you say Y here, the EFI stub will clear the busmaster bit on all
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PCI bridges before ExitBootServices() is called. This will prevent
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any malicious PCI devices from being able to perform DMA until the
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kernel reenables busmastering after configuring the IOMMU.
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This option will cause failures with some poorly behaved hardware
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and should not be enabled without testing. The kernel commandline
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options "efi=disable_early_pci_dma" or "efi=no_disable_early_pci_dma"
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may be used to override this option.
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endmenu
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config EFI_EMBEDDED_FIRMWARE
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bool
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depends on EFI
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select CRYPTO_LIB_SHA256
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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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config EFI_EARLYCON
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def_bool y
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depends on EFI && SERIAL_EARLYCON && !ARM && !IA64
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select FONT_SUPPORT
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select ARCH_USE_MEMREMAP_PROT
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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 && 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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