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 cstr::cstr;
19 use libfdt::{Fdt, FdtError};
20 
21 /// Reads the DICE data range from the given `fdt`.
read_dice_range_from(fdt: &Fdt) -> libfdt::Result<Range<usize>>22 pub fn read_dice_range_from(fdt: &Fdt) -> libfdt::Result<Range<usize>> {
23     let node = fdt.node(cstr!("/reserved-memory"))?.ok_or(FdtError::NotFound)?;
24     let node = node.next_compatible(cstr!("google,open-dice"))?.ok_or(FdtError::NotFound)?;
25     node.first_reg()?.try_into()
26 }
27 
read_vendor_hashtree_root_digest(fdt: &Fdt) -> libfdt::Result<Option<&[u8]>>28 pub(crate) fn read_vendor_hashtree_root_digest(fdt: &Fdt) -> libfdt::Result<Option<&[u8]>> {
29     let node = fdt.node(cstr!("/avf"))?.ok_or(FdtError::NotFound)?;
30     node.getprop(cstr!("vendor_hashtree_descriptor_root_digest"))
31 }
32