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const std = @import("std");
const fs = std.fs;
const Build = @import("std").Build;
const Target = @import("std").Target;
const CrossTarget = @import("std").zig.CrossTarget;
const Feature = @import("std").Target.Cpu.Feature;
pub fn build(b: *Build) !void {
const debug = b.option(bool, "debug", "Enable debug") orelse false;
const features = Target.x86.Feature;
var disabled_features = Feature.Set.empty;
var enabled_features = Feature.Set.empty;
disabled_features.addFeature(@intFromEnum(features.mmx));
disabled_features.addFeature(@intFromEnum(features.sse));
disabled_features.addFeature(@intFromEnum(features.sse2));
disabled_features.addFeature(@intFromEnum(features.avx));
disabled_features.addFeature(@intFromEnum(features.avx2));
enabled_features.addFeature(@intFromEnum(features.soft_float));
const kernel_target_query = Target.Query{
.cpu_arch = Target.Cpu.Arch.x86_64,
.os_tag = Target.Os.Tag.freestanding,
.abi = Target.Abi.none,
.cpu_features_sub = disabled_features,
.cpu_features_add = enabled_features,
};
const kernel_target = b.resolveTargetQuery(kernel_target_query);
var optimize = std.builtin.OptimizeMode.Debug;
if (!debug) {
optimize = b.standardOptimizeOption(.{});
}
const kernel = b.addExecutable(.{
.name = "kernel.elf",
.root_source_file = b.path("src/main.zig"),
.optimize = optimize,
.target = kernel_target,
});
kernel.setLinkerScript(b.path("src/linker.ld"));
kernel.entry = .disabled;
b.installArtifact(kernel);
const kernel_step = b.step("kernel", "Build the kernel");
kernel_step.dependOn(&kernel.step);
const iso_dir = b.fmt("{?s}/iso_root", .{b.cache_root.path});
const kernel_path = try fs.path.join(b.allocator, &[_][]const u8{ b.install_path, "bin", kernel.out_filename });
const iso_path = b.fmt("{s}/disk.iso", .{b.exe_dir});
const iso_cmd_str = &[_][]const u8{ "/bin/sh", "-c", std.mem.concat(b.allocator, u8, &[_][]const u8{ "mkdir -p ", iso_dir, "/boot/grub", " && ", "cp ", kernel_path, " ", iso_dir, "/boot", " && ", "cp src/boot/grub.cfg ", iso_dir, "/boot/grub", " && ", "grub-mkrescue -o ", iso_path, " ", iso_dir }) catch unreachable };
const iso_cmd = b.addSystemCommand(iso_cmd_str);
iso_cmd.step.dependOn(kernel_step);
const iso_step = b.step("iso", "Build an ISO image");
iso_step.dependOn(&iso_cmd.step);
b.default_step.dependOn(iso_step);
const run_cmd_str = &[_][]const u8{ "qemu-system-x86_64", "-cdrom", iso_path, "-debugcon", "stdio", "-vga", "virtio", "-m", "128M", "-machine", "q35,accel=kvm:tcg", "-no-reboot", "-no-shutdown" };
const run_cmd = b.addSystemCommand(run_cmd_str);
run_cmd.step.dependOn(b.getInstallStep());
const run_step = b.step("run", "Run the kernel");
run_step.dependOn(&run_cmd.step);
}
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