From c8de43bf43242c4ebac3d0ecb8e7951fe2371506 Mon Sep 17 00:00:00 2001
From: Nathan Ringo <nathan@remexre.com>
Date: Sat, 24 Feb 2024 22:03:49 -0600
Subject: Initial commit

---
 flake.nix | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 flake.nix

(limited to 'flake.nix')

diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..9e812b8
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,103 @@
+{
+  inputs = {
+    fenix-flake = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+  outputs = { self, fenix-flake, flake-utils, nixpkgs }:
+    flake-utils.lib.eachSystem [ "aarch64-linux" "x86_64-linux" ] (system:
+      let
+        pkgsBuild = nixpkgs.legacyPackages.${system};
+        pkgsHost = import nixpkgs {
+          inherit system;
+          crossSystem.config = "riscv64-unknown-none-elf";
+        };
+        fenix = fenix-flake.packages.${system};
+
+        toolchain = fenix.combine [
+          fenix.stable.cargo
+          fenix.stable.rustc
+          fenix.stable.clippy
+          fenix.targets.riscv64gc-unknown-none-elf.stable.rust-std
+        ];
+        rust = pkgsHost.makeRustPlatform {
+          cargo = toolchain;
+          rustc = toolchain;
+        };
+
+        packages = rec {
+          boards = import ./boards {
+            inherit libkernel;
+            pkgs = pkgsHost;
+          };
+          libkernel = pkgsBuild.callPackage ./kernel { inherit rust; };
+        };
+        run-vm = pkgsBuild.writeShellApplication {
+          name = "run-vm";
+
+          runtimeInputs = [ pkgsBuild.qemu ];
+
+          text = ''
+            set -x
+            qemu-system-riscv64 \
+              -machine virt \
+              -m 1G \
+              -nographic \
+              -bios none \
+              -kernel ${packages.boards.qemu-virt}/kernel.elf \
+              "$@"
+          '';
+        };
+      in {
+        apps = {
+          default = {
+            type = "app";
+            program = pkgsBuild.lib.getExe run-vm;
+          };
+
+          debug = {
+            type = "app";
+            program = pkgsBuild.lib.getExe (pkgsBuild.writeShellApplication {
+              name = "run-vm-debug";
+              runtimeInputs = [ run-vm ];
+              text = ''
+                port=$(( 1000 * ("$(id -u)" - 990) ))
+                run-vm -gdb tcp::$port -S "$@"
+              '';
+            });
+          };
+
+          gdb = {
+            type = "app";
+            program = pkgsBuild.lib.getExe (pkgsBuild.writeShellApplication {
+              name = "gdb";
+              runtimeInputs = [ toolchain ];
+              text = ''
+                port=$(( 1000 * ("$(id -u)" - 990) ))
+                rust-gdb ${packages.boards.qemu-virt}/kernel.elf \
+                  -ex "target remote 127.0.0.1:$port" \
+                  -ex "set riscv use-compressed-breakpoints yes" \
+                  -ex "layout src" \
+                  -ex "focus cmd" \
+                  -ex "tbreak hart0_boot" \
+                  -ex "c"
+              '';
+            });
+          };
+        };
+
+        devShells.default = pkgsBuild.mkShell {
+          inputsFrom =
+            builtins.attrValues (flake-utils.lib.flattenTree packages);
+          nativeBuildInputs = [
+            pkgsBuild.cargo-watch
+            pkgsBuild.qemu
+            pkgsHost.stdenv.cc.bintools.bintools
+          ];
+          CARGO_BUILD_TARGET = "riscv64gc-unknown-none-elf";
+        };
+
+        packages = flake-utils.lib.flattenTree packages;
+      });
+}
-- 
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