From bf8e05fa2b283cd1761b23bf50d1730344cc060d Mon Sep 17 00:00:00 2001
From: wangfiox <wangfiox@gmail.com>
Date: Wed, 18 Mar 2026 01:15:24 +0800
Subject: [PATCH] nix

---
 flake.lock      | 61 ++++++++++++++++++++++++++++++++++++++++
 flake.nix       | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
 nix/overlay.nix |  9 ++++++
 3 files changed, 144 insertions(+)
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 create mode 100644 nix/overlay.nix

diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000..1f675e1e
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1773646010,
+        "narHash": "sha256-iYrs97hS7p5u4lQzuNWzuALGIOdkPXvjz7bviiBjUu8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5b2c2d84341b2afb5647081c1386a80d7a8d8605",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 00000000..0dd1b241
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,74 @@
+{
+  description = "NutShell (果壳) RISC-V 处理器开发环境";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ (import ./nix/overlay.nix) ];
+        };
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          name = "nutshell-dev";
+
+          packages = with pkgs; [
+            # ========================
+            # 基础构建工具
+            # ========================
+            gnumake
+            git
+            zip
+
+            # ========================
+            # Scala/Chisel 工具链
+            # ========================
+            jdk21
+            mill_0_11_7
+            circt # 包含 firtool，Chisel 7 生成 Verilog 需要
+            metals
+            scalafmt
+
+            # ========================
+            # Verilog 仿真
+            # ========================
+            verilator
+            gcc
+
+          ];
+
+          # 环境变量
+          VERILATOR_ROOT = "${pkgs.verilator}/share/verilator";
+
+          shellHook = ''
+            export NUTSHELL_HOME="$(pwd)"
+            export NOOP_HOME="$(pwd)"
+
+            # Java
+            export JAVA_HOME="${pkgs.jdk21}"
+
+            # Chisel/CIRCT: 使用 Nix 提供的 firtool
+            export FIRTOOL="${pkgs.circt}/bin/firtool"
+            export CHISEL_FIRTOOL_PATH="${pkgs.circt}/bin"
+
+            echo "🚀 NutShell 开发环境已加载!"
+            echo "   NUTSHELL_HOME: $NUTSHELL_HOME"
+            echo ""
+            echo "📦 常用命令:"
+            echo "   make              - 生成 Verilog (build/TopMain.v)"
+            echo "   make emu          - 构建仿真器并运行"
+            echo "   make init         - 初始化 git 子模块 (difftest)"
+            echo "   make help         - 查看配置选项"
+            echo ""
+            echo "📌 可选参数: BOARD=sim|pynq|axu3cg  CORE=inorder|ooo|embedded"
+          '';
+        };
+      }
+    );
+}
diff --git a/nix/overlay.nix b/nix/overlay.nix
new file mode 100644
index 00000000..22bb1b36
--- /dev/null
+++ b/nix/overlay.nix
@@ -0,0 +1,9 @@
+final: prev: {
+  mill_0_11_7 = prev.mill.overrideAttrs (oldAttrs: rec {
+    version = "0.11.7";
+    src = prev.fetchurl {
+      url = "https://repo1.maven.org/maven2/com/lihaoyi/mill-dist/${version}/mill-dist-${version}-assembly.jar";
+      hash = "sha256-55HM/P7pwNKZ0HR02b/L/L6/EYEyO+YBIgyKgjBiq5k=";
+    };
+  });
+}