1menu "EFI (Extensible Firmware Interface) Support" 2 depends on EFI 3 4config EFI_VARS 5 tristate "EFI Variable Support via sysfs" 6 depends on EFI 7 default n 8 help 9 If you say Y here, you are able to get EFI (Extensible Firmware 10 Interface) variable information via sysfs. You may read, 11 write, create, and destroy EFI variables through this interface. 12 13 Note that using this driver in concert with efibootmgr requires 14 at least test release version 0.5.0-test3 or later, which is 15 available from: 16 <http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz> 17 18 Subsequent efibootmgr releases may be found at: 19 <http://github.com/vathpela/efibootmgr> 20 21config EFI_ESRT 22 bool 23 depends on EFI && !IA64 24 default y 25 26config EFI_VARS_PSTORE 27 tristate "Register efivars backend for pstore" 28 depends on EFI_VARS && PSTORE 29 default y 30 help 31 Say Y here to enable use efivars as a backend to pstore. This 32 will allow writing console messages, crash dumps, or anything 33 else supported by pstore to EFI variables. 34 35config EFI_VARS_PSTORE_DEFAULT_DISABLE 36 bool "Disable using efivars as a pstore backend by default" 37 depends on EFI_VARS_PSTORE 38 default n 39 help 40 Saying Y here will disable the use of efivars as a storage 41 backend for pstore by default. This setting can be overridden 42 using the efivars module's pstore_disable parameter. 43 44config EFI_RUNTIME_MAP 45 bool "Export efi runtime maps to sysfs" 46 depends on X86 && EFI && KEXEC_CORE 47 default y 48 help 49 Export efi runtime memory maps to /sys/firmware/efi/runtime-map. 50 That memory map is used for example by kexec to set up efi virtual 51 mapping the 2nd kernel, but can also be used for debugging purposes. 52 53 See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map. 54 55config EFI_FAKE_MEMMAP 56 bool "Enable EFI fake memory map" 57 depends on EFI && X86 58 default n 59 help 60 Saying Y here will enable "efi_fake_mem" boot option. 61 By specifying this parameter, you can add arbitrary attribute 62 to specific memory range by updating original (firmware provided) 63 EFI memmap. 64 This is useful for debugging of EFI memmap related feature. 65 e.g. Address Range Mirroring feature. 66 67config EFI_MAX_FAKE_MEM 68 int "maximum allowable number of ranges in efi_fake_mem boot option" 69 depends on EFI_FAKE_MEMMAP 70 range 1 128 71 default 8 72 help 73 Maximum allowable number of ranges in efi_fake_mem boot option. 74 Ranges can be set up to this value using comma-separated list. 75 The default value is 8. 76 77config EFI_PARAMS_FROM_FDT 78 bool 79 help 80 Select this config option from the architecture Kconfig if 81 the EFI runtime support gets system table address, memory 82 map address, and other parameters from the device tree. 83 84config EFI_RUNTIME_WRAPPERS 85 bool 86 87config EFI_ARMSTUB 88 bool 89 90config EFI_BOOTLOADER_CONTROL 91 tristate "EFI Bootloader Control" 92 depends on EFI_VARS 93 default n 94 ---help--- 95 This module installs a reboot hook, such that if reboot() is 96 invoked with a string argument NNN, "NNN" is copied to the 97 "LoaderEntryOneShot" EFI variable, to be read by the 98 bootloader. If the string matches one of the boot labels 99 defined in its configuration, the bootloader will boot once 100 to that label. The "LoaderEntryRebootReason" EFI variable is 101 set with the reboot reason: "reboot" or "shutdown". The 102 bootloader reads this reboot reason and takes particular 103 action according to its policy. 104 105config EFI_CAPSULE_LOADER 106 tristate "EFI capsule loader" 107 depends on EFI 108 help 109 This option exposes a loader interface "/dev/efi_capsule_loader" for 110 users to load EFI capsules. This driver requires working runtime 111 capsule support in the firmware, which many OEMs do not provide. 112 113 Most users should say N. 114 115config EFI_CAPSULE_QUIRK_QUARK_CSH 116 bool "Add support for Quark capsules with non-standard headers" 117 depends on X86 && !64BIT 118 select EFI_CAPSULE_LOADER 119 default y 120 help 121 Add support for processing Quark X1000 EFI capsules, whose header 122 layout deviates from the layout mandated by the UEFI specification. 123 124config EFI_TEST 125 tristate "EFI Runtime Service Tests Support" 126 depends on EFI 127 default n 128 help 129 This driver uses the efi.<service> function pointers directly instead 130 of going through the efivar API, because it is not trying to test the 131 kernel subsystem, just for testing the UEFI runtime service 132 interfaces which are provided by the firmware. This driver is used 133 by the Firmware Test Suite (FWTS) for testing the UEFI runtime 134 interfaces readiness of the firmware. 135 Details for FWTS are available from: 136 <https://wiki.ubuntu.com/FirmwareTestSuite> 137 138 Say Y here to enable the runtime services support via /dev/efi_test. 139 If unsure, say N. 140 141config APPLE_PROPERTIES 142 bool "Apple Device Properties" 143 depends on EFI_STUB && X86 144 select EFI_DEV_PATH_PARSER 145 select UCS2_STRING 146 help 147 Retrieve properties from EFI on Apple Macs and assign them to 148 devices, allowing for improved support of Apple hardware. 149 Properties that would otherwise be missing include the 150 Thunderbolt Device ROM and GPU configuration data. 151 152 If unsure, say Y if you have a Mac. Otherwise N. 153 154config RESET_ATTACK_MITIGATION 155 bool "Reset memory attack mitigation" 156 depends on EFI_STUB 157 help 158 Request that the firmware clear the contents of RAM after a reboot 159 using the TCG Platform Reset Attack Mitigation specification. This 160 protects against an attacker forcibly rebooting the system while it 161 still contains secrets in RAM, booting another OS and extracting the 162 secrets. This should only be enabled when userland is configured to 163 clear the MemoryOverwriteRequest flag on clean shutdown after secrets 164 have been evicted, since otherwise it will trigger even on clean 165 reboots. 166 167endmenu 168 169config UEFI_CPER 170 bool 171 172config UEFI_CPER_ARM 173 bool 174 depends on UEFI_CPER && ( ARM || ARM64 ) 175 default y 176 177config UEFI_CPER_X86 178 bool 179 depends on UEFI_CPER && X86 180 default y 181 182config EFI_DEV_PATH_PARSER 183 bool 184 depends on ACPI 185 default n 186