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const std = @import("std");
const aarch64 = std.Target.aarch64;
pub fn build(b: *std.Build) void {
const target = b.resolveTargetQuery(.{
.cpu_arch = .aarch64,
.os_tag = .freestanding,
.cpu_features_add = aarch64.featureSet(&.{
.strict_align,
}),
.cpu_model = .{
.explicit = &aarch64.cpu.cortex_a72,
},
});
const optimize = b.standardOptimizeOption(.{});
const kernel_mod = b.addModule("kernel", .{
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
});
const kernel = b.addExecutable(.{
.name = "kernel.elf",
.root_module = kernel_mod,
});
kernel.setLinkerScript(b.path("src/Link.ld"));
kernel.addAssemblyFile(b.path("src/startup.s"));
b.installArtifact(kernel);
// workaround for zig objcopy regression in 0.15.1 v_v
const kernel_copy = b.addSystemCommand(&.{ "llvm-objcopy", "-O", "binary" });
kernel_copy.addArtifactArg(kernel);
const kernel_bin = kernel_copy.addOutputFileArg("kernel.img");
const install_kernel = b.addInstallFile(
kernel_bin,
"boot/kernel8.img",
);
b.getInstallStep().dependOn(&install_kernel.step);
const firmware = b.dependency("rpi_firmware", .{});
b.installDirectory(.{
.source_dir = firmware.path("boot"),
.install_dir = .prefix,
.install_subdir = "boot",
.include_extensions = &.{
"start4.elf",
"start4db.elf",
"fixup4.dat",
"bcm2711-rpi-4-b.dtb",
},
});
b.installFile("config.txt", "boot/config.txt");
}
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