| Heinrich Schuchardt | 653a547 | 2018-07-29 13:45:47 +0200 | [diff] [blame] | 1 | .. SPDX-License-Identifier: GPL-2.0+ |
| 2 | |
| Heinrich Schuchardt | ef06570 | 2019-07-14 14:05:37 +0200 | [diff] [blame] | 3 | UEFI subsystem |
| 4 | ============== |
| 5 | |
| 6 | Lauching UEFI images |
| 7 | -------------------- |
| 8 | |
| 9 | Bootefi command |
| 10 | ~~~~~~~~~~~~~~~ |
| 11 | |
| 12 | The bootefi command is used to start UEFI applications or to install UEFI |
| 13 | drivers. It takes two parameters |
| 14 | |
| 15 | bootefi <image address> [fdt address] |
| 16 | |
| 17 | * image address - the memory address of the UEFI binary |
| 18 | * fdt address - the memory address of the flattened device tree |
| 19 | |
| 20 | The environment variable 'bootargs' is passed as load options in the UEFI system |
| 21 | table. The Linux kernel EFI stub uses the load options as command line |
| 22 | arguments. |
| 23 | |
| 24 | .. kernel-doc:: cmd/bootefi.c |
| 25 | :internal: |
| 26 | |
| 27 | Boot manager |
| 28 | ~~~~~~~~~~~~ |
| 29 | |
| 30 | The UEFI specification foresees to define boot entries and boot sequence via UEFI |
| 31 | variables. Booting according to these variables is possible via |
| 32 | |
| 33 | bootefi bootmgr [fdt address] |
| 34 | |
| 35 | * fdt address - the memory address of the flattened device tree |
| 36 | |
| 37 | The relevant variables are: |
| 38 | |
| 39 | * Boot0000-BootFFFF define boot entries |
| 40 | * BootNext specifies next boot option to be booted |
| 41 | * BootOrder specifies in which sequence the boot options shall be tried if |
| 42 | BootNext is not defined or booting via BootNext fails |
| 43 | |
| 44 | .. kernel-doc:: lib/efi_loader/efi_bootmgr.c |
| 45 | :internal: |
| 46 | |
| 47 | Efidebug command |
| 48 | ~~~~~~~~~~~~~~~~ |
| 49 | |
| 50 | The efidebug command is used to set and display boot options as well as to |
| 51 | display information about internal data of the UEFI subsystem (devices, |
| 52 | drivers, handles, loaded images, and the memory map). |
| 53 | |
| 54 | .. kernel-doc:: cmd/efidebug.c |
| 55 | :internal: |
| 56 | |
| 57 | Initialization of the UEFI sub-system |
| 58 | ------------------------------------- |
| 59 | |
| 60 | .. kernel-doc:: lib/efi_loader/efi_setup.c |
| 61 | :internal: |
| Heinrich Schuchardt | 653a547 | 2018-07-29 13:45:47 +0200 | [diff] [blame] | 62 | |
| 63 | Boot services |
| 64 | ------------- |
| 65 | |
| 66 | .. kernel-doc:: lib/efi_loader/efi_boottime.c |
| 67 | :internal: |
| 68 | |
| Heinrich Schuchardt | 0fcdb7a | 2019-02-16 15:22:13 +0100 | [diff] [blame] | 69 | Image relocation |
| 70 | ~~~~~~~~~~~~~~~~ |
| 71 | |
| 72 | .. kernel-doc:: lib/efi_loader/efi_image_loader.c |
| 73 | :internal: |
| 74 | |
| Heinrich Schuchardt | ef06570 | 2019-07-14 14:05:37 +0200 | [diff] [blame] | 75 | Memory services |
| 76 | ~~~~~~~~~~~~~~~ |
| 77 | |
| 78 | .. kernel-doc:: lib/efi_loader/efi_memory.c |
| 79 | :internal: |
| 80 | |
| Heinrich Schuchardt | 653a547 | 2018-07-29 13:45:47 +0200 | [diff] [blame] | 81 | Runtime services |
| 82 | ---------------- |
| 83 | |
| 84 | .. kernel-doc:: lib/efi_loader/efi_runtime.c |
| 85 | :internal: |
| Heinrich Schuchardt | ef06570 | 2019-07-14 14:05:37 +0200 | [diff] [blame] | 86 | |
| 87 | Variable services |
| 88 | ~~~~~~~~~~~~~~~~~ |
| 89 | |
| 90 | .. kernel-doc:: lib/efi_loader/efi_variable.c |
| 91 | :internal: |
| 92 | |
| 93 | UEFI drivers |
| 94 | ------------ |
| 95 | |
| 96 | UEFI driver uclass |
| 97 | ~~~~~~~~~~~~~~~~~~ |
| 98 | .. kernel-doc:: lib/efi_driver/efi_uclass.c |
| 99 | :internal: |
| 100 | |
| 101 | Block device driver |
| 102 | ~~~~~~~~~~~~~~~~~~~ |
| 103 | |
| 104 | .. kernel-doc:: lib/efi_driver/efi_block_device.c |
| 105 | :internal: |