From 4e65ca00f3a30791752529fe9ffe8c02da104c62 Mon Sep 17 00:00:00 2001 From: AKASHI Takahiro Date: Thu, 28 Apr 2022 17:09:39 +0900 Subject: efi_loader: bootmgr: add booting from removable media Under the current implementation, booting from removable media using a architecture-specific default image name, say BOOTAA64.EFI, is supported only in distro_bootcmd script. See the commit 74522c898b35 ("efi_loader: Add distro boot script for removable media"). This is, however, half-baked implementation because 1) UEFI specification requires this feature to be implemented as part of Boot Manager's responsibility: 3 - Boot Manager 3.5.1 Boot via the Simple File Protocol When booting via the EFI_SIMPLE_FILE_SYSTEM_PROTOCOL, the FilePath will start with a device path that points to the device that implements the EFI_SIMPLE_FILE_SYSTEM_PROTOCOL or the EFI_BLOCK_IO_PROTOCOL. The next part of the FilePath may point to the file name, including subdirectories, which contain the bootable image. If the file name is a null device path, the file name must be generated from the rules defined below. ... 3.5.1.1 Removable Media Boot Behavior To generate a file name when none is present in the FilePath, the firmware must append a default file name in the form \EFI\BOOT\BOOT{machine type short-name}.EFI ... 2) So (1) entails the hehavior that the user's preference of boot media order should be determined by Boot#### and BootOrder variables. With this patch, the semantics mentioned above is fully implemented. For example, if you want to boot the system from USB and SCSI in this order, * define Boot0001 which contains only a device path to the USB device (without any file path/name) * define Boot0002 which contains only a device path to the SCSI device, and * set BootOrder to Boot0001:Boot0002 To avoid build error for sandbox, default file name "BOOTSANDBOX.efi" is defined even if it is out of scope of UEFI specification. Signed-off-by: AKASHI Takahiro Signed-off-by: Masahisa Kojima On sandbox use binary name corresponding to host architecture. Reviewed-by: Heinrich Schuchardt --- include/efi_default_filename.h | 45 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 include/efi_default_filename.h (limited to 'include') diff --git a/include/efi_default_filename.h b/include/efi_default_filename.h new file mode 100644 index 00000000000..13b9de8754a --- /dev/null +++ b/include/efi_default_filename.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * When a boot option does not provide a file path the EFI file to be + * booted is \EFI\BOOT\$(BOOTEFI_NAME).EFI. The architecture specific + * file name is defined in this include. + * + * Copyright (c) 2022, Heinrich Schuchardt + */ + +#ifndef _EFI_DEFAULT_FILENAME_H +#define _EFI_DEFAULT_FILENAME_H + +#include + +#undef BOOTEFI_NAME + +#if HOST_ARCH == HOST_ARCH_X86_64 +#define BOOTEFI_NAME "BOOTX64.EFI" +#endif + +#if HOST_ARCH == HOST_ARCH_X86 +#define BOOTEFI_NAME "BOOTIA32.EFI" +#endif + +#if HOST_ARCH == HOST_ARCH_AARCH64 +#define BOOTEFI_NAME "BOOTAA64.EFI" +#endif + +#if HOST_ARCH == HOST_ARCH_ARM +#define BOOTEFI_NAME "BOOTARM.EFI" +#endif + +#if HOST_ARCH == HOST_ARCH_RISCV32 +#define BOOTEFI_NAME "BOOTRISCV32.EFI" +#endif + +#if HOST_ARCH == HOST_ARCH_RISCV64 +#define BOOTEFI_NAME "BOOTRISCV64.EFI" +#endif + +#ifndef BOOTEFI_NAME +#error Unsupported UEFI architecture +#endif + +#endif -- cgit v1.2.3