first commit

build.zig

@@ -0,0 +1,41 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const optimize = b.standardOptimizeOption(.{});
+
+    const target = b.resolveTargetQuery(.{
+        .cpu_arch = .riscv64,
+        .os_tag = .freestanding,
+        .abi = .none,
+    });
+
+    const kernel = b.addExecutable(.{
+        .name = "kernel",
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/main.zig"),
+            .target = target,
+            .optimize = optimize,
+            .code_model = .medium,
+        }),
+    });
+
+    kernel.setLinkerScript(b.path("linker.ld"));
+
+    b.installArtifact(kernel);
+
+    const run_cmd = b.addSystemCommand(&.{
+        "qemu-system-riscv64",
+        "-machine",
+        "virt",
+        "-bios",
+        "default",
+        "-kernel",
+    });
+    run_cmd.addArtifactArg(kernel);
+    run_cmd.addArgs(&.{
+        "-nographic",
+    });
+
+    const run_step = b.step("run", "Run the kernel in QEMU");
+    run_step.dependOn(&run_cmd.step);
+}