[wip] try to use fdt-rs for DTB parsing

Cargo.lock

@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
 [[package]]
 name = "bit_field"
 version = "0.10.1"
@@ -35,18 +41,40 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
 
-[[package]]
-name = "dtb"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be6c6e1672a044abd9652045ba11beb1c7fbec7e5262dcba54795e82aa577971"
-
 [[package]]
 name = "either"
 version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
+[[package]]
+name = "endian-type-rs"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6419a5c75e40011b9fe0174db3fe24006ab122fbe1b7e9cc5974b338a755c76"
+
+[[package]]
+name = "fallible-iterator"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4443176a9f2c162692bd3d352d745ef9413eec5782a80d8fd6f8a1ac692a07f7"
+
+[[package]]
+name = "fdt-rs"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99a40cabc11c8258822a593f5c51f2d9f4923e715ca9e2a0630cf77ae15f390b"
+dependencies = [
+ "endian-type-rs",
+ "fallible-iterator",
+ "memoffset",
+ "num-derive",
+ "num-traits",
+ "rustc_version",
+ "static_assertions",
+ "unsafe_unwrap",
+]
+
 [[package]]
 name = "itertools"
 version = "0.8.2"
@@ -56,6 +84,35 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "memoffset"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "043175f069eda7b85febe4a74abbaeff828d9f8b448515d3151a14a3542811aa"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "num-derive"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.27"
@@ -86,6 +143,30 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bd7a31eed1591dcbc95d92ad7161908e72f4677f8fabf2a32ca49b4237cbf211"
 
+[[package]]
+name = "rustc_version"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "semver"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
+dependencies = [
+ "semver-parser",
+]
+
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
+
 [[package]]
 name = "shrinkwraprs"
 version = "0.3.0"
@@ -120,6 +201,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
 [[package]]
 name = "syn"
 version = "1.0.73"
@@ -143,6 +230,12 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
 
+[[package]]
+name = "unsafe_unwrap"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1230ec65f13e0f9b28d789da20d2d419511893ea9dac2c1f4ef67b8b14e5da80"
+
 [[package]]
 name = "usize_conversions"
 version = "0.2.0"
@@ -163,7 +256,7 @@ dependencies = [
  "bitflags",
  "cfg-if",
  "cortex-a",
- "dtb",
+ "fdt-rs",
  "qemu-exit",
  "r0",
  "shrinkwraprs",

nucleus/Cargo.toml

@@ -35,7 +35,9 @@ bitflags = "1.2"
 cfg-if = "1.0"
 snafu = { version = "0.7.0-beta.0", default-features = false }
 shrinkwraprs = { version = "0.3", default-features = false }
-dtb = "0.2" # Dec 2019 by Simon Prikhodko
+#dtb = "0.2" # Dec 2019 by Simon Prikhodko
 # Alternatives to dtb to look at:
 #device_tree = "1.1.0" # Jun 2016 by Marc Brinkmann
-#fdt-rs = "0.4.2" # Aug 2020 by Sean Wilson
+# fdt-rs latest 0.4.3 Jul 2021 by Sean Wilson -- interface is more basic than in dtb
+fdt-rs = { version = "0.4", default-features = false }
+# @todo Added from_raw_pointer() finally

nucleus/src/main.rs

@@ -52,6 +52,7 @@ use {
         vc::VC,
     },
     cfg_if::cfg_if,
+    fdt_rs::base::DevTree,
 };
 
 entry!(kmain);
@@ -168,12 +169,11 @@ pub fn kmain(dtb: u32) -> ! {
     println!("DTB loaded at {:x}", dtb);
 
     // Safety: we got the address from the bootloader, if it lied - well, we're screwed!
-    let device_tree = crate::device_tree::DeadTree::new(unsafe {
-        dtb::Reader::read_from_address(dtb as usize).expect("DeviceTree not found")
-    });
+    let device_tree =
+        unsafe { DevTree::from_raw_pointer(dtb as *const _).expect("DeviceTree failed to read") };
 
     // List unusable memory, and remove it from the memory regions for the allocator.
-    for entry in device_tree.reserved_mem_entries() {
+    for entry in device_tree.compatible_nodes("memory") {
         println!("reserved: {:?} bytes at {:?}", entry.size, entry.address);
     }
     // Also, remove the DTB memory region.