const std = @import("std");

pub fn build(b: *std.Build) void {
    const target = b.resolveTargetQuery(.{
        .cpu_arch = .riscv64,
        .abi = .none,
        .os_tag = .freestanding,
        .ofmt = .elf,
    });
    const optimize = b.standardOptimizeOption(.{});

    const exe = b.addExecutable(.{
        .name = "kernel",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/main.zig"),
            .target = target,
            .optimize = optimize,
            .code_model = .medany,
        }),
    });
    exe.root_module.addAssemblyFile(b.path("src/asm/boot.S"));
    exe.root_module.addAssemblyFile(b.path("src/asm/trap.S"));
    exe.linker_script = b.path("src/ld/virt.ld");
    b.installArtifact(exe);

    const run_step = b.step("run", "Run the app");
    const run_cmd = b.addSystemCommand(&.{
        // zig fmt: off
        "qemu-system-riscv64",
        "-machine", "virt",
        "-cpu", "rv64",
        "-smp", "4",
        "-m", "128M",
        // "-drive", "if=none,format=raw,file=hdd.dsk,id=foo",
        // "-device", "virtio-blk-device,scsi=off,drive=foo",
        "-nographic",
        "-serial", "mon:stdio",
        "-bios", "none",
        "-device", "virtio-rng-device",
        "-device", "virtio-net-device",
        "-device", "virtio-tablet-device",
        "-device", "virtio-keyboard-device",
        "-S", "-s", 
        "-kernel"
        // zig fmt: on
    });
    run_cmd.addArtifactArg(exe);
    run_step.dependOn(&run_cmd.step);
    run_cmd.step.dependOn(b.getInstallStep());
}