ydrmaster/dtb-walker

遍历设备树二进制对象

你好

近期主要关注 Rust 和 RISCV。也许这些开源项目能够帮得上忙：

• 下列库不需要 std 和 alloc，零开销抽象，因此可用于几乎任何软件

  • crates.io/dtb-walker: 遍历设备树二进制对象（dtb）。
  • crates.io/page-table: 页表。目前提供 RISCV sv32/sv39/sv48/sv57 页表的定义和操作。

• 其他项目

  

  这个项目实现适用于 qemu virt 虚拟设备的特权运行环境（SEE）。SEE 向特权软件（Supervisor）提供由 RISCV 标准定义的特权态二进制接口（SBI：Supervisor Binary Interface）。

---

这个语言统计没什么意义，因为我大部分提交在组织里

dtb-walker's Issues

Dependency Dashboard

This issue lists Renovate updates and detected dependencies. Read the Dependency Dashboard docs to learn more.

Open

These updates have all been created already. Click a checkbox below to force a retry/rebase of any.

• chore(deps): update actions/checkout action to v4
• chore(deps): update github/codeql-action action to v3

Detected dependencies

github-actions

.github/workflows/workflow.yml

• actions/checkout v3
• actions-rs/toolchain v1
• actions-rs/cargo v1
• actions-rs/install v0.1
• actions-rs/install v0.1
• actions-rs/cargo v1
• github/codeql-action v2

---

• Check this box to trigger a request for Renovate to run again on this repository

带上下文遍历

当前版本保证遍历是无开销的，但也无法携带上下文。使用时得每次通过当前的 path 判断所在的节点。

应该可以实现一个带上下文的遍历，根据节点进入或退出自动在栈上创建上下文对象。

如果实现这个效果将极大简化遍历的代码。

这个功能将包含在 0.2.0 版本中。

Panic in FdtHeader::verify() when using with QEMU and RISC-V virt machine

I get a panic in FdtHeader::verify() when using with QEMU and RISC-V virt machine:

called 'Result::unwrap()' on an 'Err' value: LastCompVersion

which occurs at line 60 while checking the header's minimum compatibility version. Note that this is the standard QEMU FDT for the RISC-V virt machine.

Version info:

• dtb-walker 0.1.0
• QEMU emulator version 6.0.0 (Debian 1:6.0+dfsg-2expubuntu1.2)

I run QEMU like this:

qemu-system-riscv64 -M virt -m 256M -nographic \
  -bios ../opensbi/build/platform/generic/firmware/fw_jump.elf \
  -kernel <path/to/my/binary>

My code looks like this:

pub fn dump(fdt: &*const u8) {
  use dtb_walker::{Dtb, DtbObj, WalkOperation};
  let dtb = unsafe { Dtb::from_raw_parts(*fdt) }.unwrap();
  ...

If I change it to:

pub fn dump(fdt: &*const u8) {
  use dtb_walker::{Dtb, DtbObj, WalkOperation};
  let dtb = unsafe { Dtb::from_raw_parts_unchecked(*fdt) };
  ...

It seems to work, since I get a dump of the FDT. Is it possible that this library is compatible with FDT versions older than 16? Maybe you can reduce the number?

If this library is compatible only with 16 or later, what parts don't work with older versions?

Thanks.