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Chosen: convey kernel info inside chosen node #15

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Chosen: convey kernel info inside chosen node #15

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26 changes: 25 additions & 1 deletion src/standard_nodes.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,10 +8,15 @@ use crate::{
Fdt,
};

pub struct KernelInfo {
address: u64,
size: u64,
}

/// Represents the `/chosen` node with specific helper methods
#[derive(Debug, Clone, Copy)]
pub struct Chosen<'b, 'a: 'b> {
pub(crate) node: FdtNode<'b, 'a>,
node: FdtNode<'b, 'a>,
}

impl<'b, 'a: 'b> Chosen<'b, 'a> {
Expand All @@ -23,6 +28,25 @@ impl<'b, 'a: 'b> Chosen<'b, 'a> {
.and_then(|n| core::str::from_utf8(&n.value[..n.value.len() - 1]).ok())
}

/// Get kernel image location and size
pub fn kernel_info(self) -> Option<KernelInfo> {
let address = self.node
.properties()
.find(|n| n.name == "linux,kernel-start")
.and_then(|n| n.value)

if address.is_none() {
return None;
}

let size = self.node
.properties()
.find(|n| n.name == "linux,kernel-size")
.and_then(|n| n.value)

Some(KernelInfo(address, size))
}

/// Searches for the node representing `stdout`, if the property exists,
/// attempting to resolve aliases if the node name doesn't exist as-is
pub fn stdout(self) -> Option<StdInOutPath<'b, 'a>> {
Expand Down