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This module installs a reboot callback, such that if reboot() is invoked with a string argument NNN, "NNN" is copied to the "LoaderEntryOneShot" EFI variable, to be read by the bootloader. If the string matches one of the boot labels defined in its configuration, the bootloader will boot once to that label. The "LoaderEntryRebootReason" EFI variable is set with the reboot reason: "reboot", "shutdown". The bootloader reads this reboot reason and takes particular action according to its policy. There are reboot implementations that do "reboot <reason>", such as Android's reboot command and Upstart's reboot replacement, which pass the reason as an argument to the reboot syscall. There is no platform-agnostic way how those could be modified to pass the reason to the bootloader, regardless of platform or bootloader. Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stefan Stanacar <stefan.stanacar@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/1461614832-17633-26-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
109 lines
3.4 KiB
Plaintext
109 lines
3.4 KiB
Plaintext
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_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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endmenu
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config UEFI_CPER
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bool
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