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build.zig
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const std = @import("std");
const Build = std.Build;
const Step = Build.Step;
const Target = std.Target;
const builtin = @import("builtin");
// imageBuilder dependences references
const imageBuilder = @import("dependencies/image-builder/image-builder/main.zig");
const MiB = imageBuilder.size_constants.MiB;
const GPTr = imageBuilder.size_constants.GPT_reserved_sectors;
const Arch = Target.Cpu.Arch;
const TargetArch = enum {
x86_64,
aarch64
};
const BiosMode = enum {
bios,
uefi
};
const DiskLayout = enum {
MBR, GPT
};
const Bootloader = enum {
limine
};
pub fn build(b: *std.Build) void {
b.exe_dir = "zig-out/";
const target_arch = b.option(TargetArch, "tarch", "Target archtecture (Default is host)") orelse switch (builtin.cpu.arch) {
.x86_64 => .x86_64,
.aarch64 => .aarch64,
else => std.debug.panic("System not implemented to host archtectore {s}!", .{@tagName(builtin.cpu.arch)})
};
const target_bldr = b.option(Bootloader, "bootloader", "Desired bootloader (Default is Limine)") orelse .limine;
const target_bios = b.option(BiosMode, "biosMode", "BIOS or UEFI (Default is BIOS)") orelse .bios;
const disk_layout_temp = b.option(DiskLayout, "diskLayout", "Desired disk layout");
// qemu options
const memory = b.option([]const u8, "memory", "How much memory the machine has") orelse "512M";
const use_gdb = b.option(bool, "useGDB", "use GDB for debugging") orelse false;
if (target_bios == .uefi and disk_layout_temp == .MBR) @panic("MBR disk layout is not compatible with UEFI!");
const arch: Arch = switch (target_arch) {
.aarch64 => .aarch64,
.x86_64 => .x86_64,
};
const disk_layout: DiskLayout = disk_layout_temp orelse switch (target_bios) {
.bios => .MBR,
.uefi => .GPT
};
// boot partition
const bootloader_step = install_bootloader(b, "disk/boot/", arch, target_bios, target_bldr);
const kernel_step = install_kernel(b, "disk/boot/", arch, target_bios, target_bldr);
// main partition
const fs_step = install_fs(b, "disk/main/", arch, target_bios, target_bldr);
// generate disk image
const install_disk = addDummyStep(b, "Install Disk Image");
var disk_step: *Build.Step = undefined;
// TODO put these in option flags
const disk_boot_size = 5*MiB;
const disk_main_size = 5*MiB;
switch (disk_layout) {
.MBR => {
const disk_total_size = disk_boot_size + disk_main_size + 65;
var disk = imageBuilder.addBuildDiskImage(b, .MBR, disk_total_size, "SystemElva.img");
disk.addGap(64); // limine bios-install needs this gap in MBR
disk.addPartition(.vFAT, "boot", "zig-out/disk/boot", disk_boot_size);
disk.addPartition(.vFAT, "main", "zig-out/disk/main", disk_main_size);
const bios_install = b.addSystemCommand(&.{
if (builtin.os.tag == .windows) "limine.exe" else "limine",
"bios-install",
"zig-out/SystemElva.img"
});
bios_install.step.dependOn(&disk.step);
install_disk.dependOn(&bios_install.step);
disk_step = &disk.step;
},
.GPT => {
const total_size = disk_boot_size + disk_main_size + GPTr + 64;
var disk = imageBuilder.addBuildDiskImage(b, .GPT, total_size, "SystemElva.img");
disk.addPartition(.vFAT, "boot", "zig-out/disk/boot", disk_boot_size);
disk.addPartition(.vFAT, "main", "zig-out/disk/main", disk_main_size);
disk.addPartition(.empty, "limine", "", 64);
const bios_install = b.addSystemCommand(&.{
if (builtin.os.tag == .windows) "limine.exe" else "limine",
"bios-install", "zig-out/SystemElva.img", "3"
});
bios_install.step.dependOn(&disk.step);
install_disk.dependOn(&bios_install.step);
disk_step = &disk.step;
}
}
disk_step.dependOn(bootloader_step);
disk_step.dependOn(kernel_step);
disk_step.dependOn(fs_step);
// Generate qemu args and run it
const Rope = std.ArrayList([]const u8);
var qemu_args = Rope.init(b.allocator);
defer qemu_args.deinit();
switch (target_arch) {
.aarch64 => {
qemu_args.append("qemu-system-aarch64") catch @panic("OOM");
qemu_args.appendSlice(&.{"-cpu", "cortex-a57"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-machine", "virt"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-device", "virtio-blk-device,drive=hd0,id=blk1"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-drive", "id=hd0,file=zig-out/SystemElva.img,format=raw,if=none"}) catch @panic("OOM");
// for UEFI emulation
if (target_bios == .uefi) qemu_args.appendSlice(&.{"-bios", "dependencies/debug/aarch64_OVMF.fd"}) catch @panic("OOM");
// as aarch64 don't have PS/2
qemu_args.appendSlice(&.{"-device", "qemu-xhci,id=usb"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-device", "usb-mouse"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-device", "usb-kbd"}) catch @panic("OOM");
// as aarch64 don't have framebuffer
qemu_args.appendSlice(&.{"-device", "ramfb"}) catch @panic("OOM");
},
.x86_64 => {
qemu_args.append("qemu-system-x86_64") catch @panic("OOM");
qemu_args.appendSlice(&.{"-machine", "q35"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-device", "ahci,id=ahci"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-device", "ide-hd,drive=drive0,bus=ahci.0"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-drive", "id=drive0,file=zig-out/SystemElva.img,format=raw,if=none"}) catch @panic("OOM");
// for UEFI emulation
if (target_bios == .uefi) qemu_args.appendSlice(&.{"-bios", "dependencies/debug/x86_64_OVMF.fd"}) catch @panic("OOM");
},
}
// general options
qemu_args.appendSlice(&.{"-m", memory}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-serial", "file:zig-out/stdout.txt"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-serial", "file:zig-out/stderr.txt"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-monitor", "mon:stdio"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-display", "gtk,zoom-to-fit=on"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-D", "zig-out/log.txt"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-d", "int,mmu,fpu,cpu_reset,guest_errors,strace"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"--no-reboot"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"--no-shutdown"}) catch @panic("OOM");
//qemu_args.appendSlice(&.{"-trace", "*xhci*"}) catch @panic("OOM");
if (use_gdb) qemu_args.appendSlice(&.{"-s", "-S"}) catch @panic("OOM");
qemu_args.appendSlice(&.{"-qmp", "unix:qmp.socket,server,nowait"}) catch @panic("OOM");
const run_qemu = b.addSystemCommand(qemu_args.items);
const after_run = b.addSystemCommand(&.{"bash", "afterrun.sh"});
// default (only build)
b.getInstallStep().dependOn(install_disk);
run_qemu.step.dependOn(b.getInstallStep());
after_run.step.dependOn(&run_qemu.step);
// build and run
const run_step = b.step("run", "Run the OS in qemu");
run_step.dependOn(&after_run.step);
}
fn install_bootloader(b: *std.Build, path: []const u8, arch: Arch, bios: BiosMode, bldr: Bootloader) *Step {
_ = bios;
_ = bldr;
var arena = std.heap.ArenaAllocator.init(b.allocator);
const alloc = arena.allocator();
defer arena.deinit();
var install_bootloader_step = addDummyStep(b, "Install Bootloader");
const bootloader = brk: switch (arch) {
.aarch64 => {
const dest = std.fs.path.join(alloc, &.{ path, "EFI/BOOT/BOOTAA64.EFI" }) catch @panic("OOM");
break :brk b.addInstallFile(b.path("dependencies/limine/BOOTAA64.EFI"), dest);
},
.x86_64 => {
const dest = std.fs.path.join(alloc, &.{ path, "EFI/BOOT/BOOTX64.EFI" }) catch @panic("OOM");
break :brk b.addInstallFile(b.path("dependencies/limine/BOOTX64.EFI"), dest);
},
else => unreachable
};
const limine_bios = brk: {
const dest = std.fs.path.join(alloc, &.{ path, "boot/limine/limine-bios.sys" }) catch @panic("OOM");
break :brk b.addInstallFile(b.path("dependencies/limine/limine-bios.sys"), dest);
};
const limine_config = brk: {
const dest = std.fs.path.join(alloc, &.{ path, "boot/limine/limine.conf" }) catch @panic("OOM");
break :brk b.addInstallFile(b.path("dependencies/limine/config.txt"), dest);
};
install_bootloader_step.dependOn(&bootloader.step);
install_bootloader_step.dependOn(&limine_bios.step);
install_bootloader_step.dependOn(&limine_config.step);
return install_bootloader_step;
}
fn install_kernel(b: *std.Build, path: []const u8, arch: Arch, bios: BiosMode, bldr: Bootloader) *Step {
_ = arch;
_ = bios;
_ = bldr;
const install_path = std.fs.path.join(b.allocator, &.{ path, "/kernel" }) catch @panic("OOM");
defer b.allocator.free(install_path);
const kernel_dep = b.dependency("kernel", .{});
const kernel = kernel_dep.artifact("kernel");
const kernel_install = b.addInstallFile(kernel.getEmittedBin(), install_path);
return &kernel_install.step;
}
fn install_fs(b: *std.Build, path: []const u8, arch: Arch, bios: BiosMode, bldr: Bootloader) *Step {
_ = arch;
_ = bios;
_ = bldr;
const install_fs_step = addDummyStep(b, "Install File System Root");
const install_root = b.addInstallDirectory(.{
.source_dir = b.path("fs_root/"),
.install_dir = .prefix,
.install_subdir = path,
});
install_fs_step.dependOn(&install_root.step);
return install_fs_step;
}
fn addDummyStep(b: *Build, name: []const u8) *Step {
const step = b.allocator.create(Step) catch unreachable;
step.* = Step.init(.{
.id = .custom,
.name = name,
.owner = b
});
return step;
}