1 // Copyright 2023, The Android Open Source Project
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 //! High-level FDT functions.
16
17 use core::ops::Range;
18 use libfdt::{Fdt, FdtError};
19
20 /// Reads the DICE data range from the given `fdt`.
read_dice_range_from(fdt: &Fdt) -> libfdt::Result<Range<usize>>21 pub fn read_dice_range_from(fdt: &Fdt) -> libfdt::Result<Range<usize>> {
22 let node = fdt.node(c"/reserved-memory")?.ok_or(FdtError::NotFound)?;
23 let node = node.next_compatible(c"google,open-dice")?.ok_or(FdtError::NotFound)?;
24 node.first_reg()?.try_into()
25 }
26
read_vendor_hashtree_root_digest(fdt: &Fdt) -> libfdt::Result<Option<&[u8]>>27 pub(crate) fn read_vendor_hashtree_root_digest(fdt: &Fdt) -> libfdt::Result<Option<&[u8]>> {
28 let node = fdt.node(c"/avf")?.ok_or(FdtError::NotFound)?;
29 node.getprop(c"vendor_hashtree_descriptor_root_digest")
30 }
31
read_is_strict_boot(fdt: &Fdt) -> libfdt::Result<bool>32 pub(crate) fn read_is_strict_boot(fdt: &Fdt) -> libfdt::Result<bool> {
33 match fdt.chosen()? {
34 Some(node) => Ok(node.getprop(c"avf,strict-boot")?.is_some()),
35 None => Ok(false),
36 }
37 }
38