build.zig

const std = @import("std");

pub fn build(builder: *std.Build) void {
    const target = builder.resolveTargetQuery(.{
        .cpu_arch = .x86_64,
        .os_tag = .uefi,
        .cpu_features_sub = std.Target.x86.featureSet(&.{ .mmx, .sse, .sse2, .sse3, .ssse3, .sse4_1, .sse4_2, .avx, .avx2, .avx512f }),
    });
    const optimize = builder.standardOptimizeOption(.{});

    const exe = builder.addExecutable(.{
        .name = "bootx64",
        .root_module = builder.createModule(.{
            .root_source_file = builder.path("src/main.zig"),
            .target = target,
            .optimize = optimize,
        }),
    });

    builder.installArtifact(exe);

    const run_step = builder.step("run", "Run in QEMU");
    const qemu = builder.addSystemCommand(&.{"qemu-system-x86_64"});

    const disk = builder.addWriteFiles();
    const boot_file = disk.addCopyFile(exe.getEmittedBin(), "EFI/BOOT/BOOTX64.EFI");

    qemu.stdio = .inherit;
    qemu.addArgs(&.{
        "-serial",
        "stdio",
        "-m",
        "2G",
        "-drive",
        "if=pflash,format=raw,readonly=on,file=ovmf.fd",
        "-drive",
    });
    qemu.addPrefixedDirectoryArg("format=raw,file=fat:rw:", boot_file.dirname().dirname().dirname());
    run_step.dependOn(&qemu.step);
}