uefi: Implement path#135475
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nicholasbishop
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UEFI paths can be of 4 types: 1. Absolute Shell Path: Uses shell mappings 2. Absolute Device Path: this is what we want 3: Relative root: path relative to the current root. 4: Relative Absolute shell path can be identified with `:` and Absolute Device path can be identified with `/`. Relative root path will start with `\`. The algorithm is mostly taken from edk2 UEFI shell implementation and is somewhat simple. Check for the path type in order. For Absolute Shell path, use `EFI_SHELL->GetDevicePathFromMap` to get a BorrowedDevicePath for the volume. For Relative paths, we use the current working directory to construct the new path. BorrowedDevicePath abstraction is needed to interact with `EFI_SHELL->GetDevicePathFromMap` which returns a Device Path Protocol with the lifetime of UEFI shell. Absolute Shell paths cannot exist if UEFI shell is missing. Signed-off-by: Ayush Singh <ayush@beagleboard.org>
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cc @tgross35 |
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r? @jhpratt |
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As a target maintainer has already given this the okay, this LGTM. @bors r+ |
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This PR is split off from #135368 to reduce noise.
UEFI paths can be of 4 types:
Absolute shell path can be identified with
:and Absolute Device path can be identified with/. Relative root path will start with\.The algorithm is mostly taken from edk2 UEFI shell implementation and is somewhat simple. Check for the path type in order.
For Absolute Shell path, use
EFI_SHELL->GetDevicePathFromMapto get a BorrowedDevicePath for the volume.For Relative paths, we use the current working directory to construct the new path.
BorrowedDevicePath abstraction is needed to interact with
EFI_SHELL->GetDevicePathFromMapwhich returns a Device Path Protocol with the lifetime of UEFI shell.Absolute Shell paths cannot exist if UEFI shell is missing.
cc @nicholasbishop