Initial, buildable code and repo layout

Two MIPS III N32 ABI executables are produced; requires this patch:
rust-lang/rust#113497

See the readme for instructions and other notes.

.cargo/config.toml

@@ -0,0 +1,58 @@
+# ---
+# Configuration for Cargo inherited by all virtual workspaces
+# ---
+
+# The Nintendo 64 is not an officially supported platform by Rust. To target
+# this platform, normally available out of the box modules and intrinsics for
+# officially supported platforms (e.g. memset) must be compiled alongside the
+# packages in this repo.
+#
+# Docs:
+#   - https://doc.rust-lang.org/cargo/reference/unstable.html#build-std
+#   - https://doc.rust-lang.org/cargo/reference/unstable.html#build-std-features
+#   - https://github.com/rust-lang/compiler-builtins
+#
+[unstable]
+build-std = [
+    "core",
+    "compiler_builtins",
+]
+build-std-features = [
+    "compiler-builtins-mem",
+]
+
+# Linking "freestanding" binaries requires special incantations on most platforms,
+# see: https://os.phil-opp.com/freestanding-rust-binary/#linker-errors
+#
+[target.'cfg(target_os = "linux")']
+rustflags = [
+    "-C", "link-arg=-nostartfiles",
+]
+
+[target.'cfg(target_os = "macos")']
+rustflags = [
+    "-C", "link-args=-e __start -static -nostartfiles",
+]
+
+# This project targets the platform's central processor and graphics coprocessor,
+# which have different microarchitectures (despite both being MIPS processors).
+# Target-specific rustc flags are defined below if they're needed. Example args
+# useful for debugging code generate are left commented.
+#
+[target.mips-ultra64-cpu]
+rustflags = [
+    # "--verbose",
+    # "--print", "link-args",
+    # "--emit=llvm-ir,llvm-bc",
+    # "-C", "save-temps",
+]
+
+[target.mips-ultra64-rcp]
+rustflags = [
+    # "--verbose",
+    # "--print", "link-args",
+    # "--emit=llvm-ir,llvm-bc",
+    # "-C", "save-temps",
+]
+
+# eof

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "rust-analyzer.linkedProjects": [
+        "${workspaceFolder}/Cargo.toml"
+    ]
+}

Cargo.toml

@@ -0,0 +1,22 @@
+[workspace]
+resolver = "2"
+members = [
+    "lib-kernel",
+    "rcp-kernel",
+    "cpu-kernel",
+]
+
+[workspace.package]
+version = "0.0.1"
+edition = "2021"
+license = "GPL-3.0+"
+repository = "https://github.com/xSetech/Summer"
+authors = [
+    "Seth Junot <xsetech@gmail.com>",
+]
+
+[profile.dev]
+panic = "abort"
+
+[profile.release]
+panic = "abort"