This commit is contained in:
Dario48 2025-07-15 18:26:34 +02:00
parent b8c7fc5674
commit 5be9186a2d

View file

@ -7,14 +7,21 @@ pub fn build(b: *std.Build) void {
const initramfs = addNasmFiles(b, AddNasmFilesOptions{
.filename = "src/initramfs.asm",
.outputname = "initramfs.bin",
.addAsObjFile = false,
.flags = &.{"-f bin"},
});
const kernel = addNasmFiles(b, AddNasmFilesOptions{
.filename = "src/kernel.asm",
.outputname = "kernel.bin",
.flags = &.{"-f bin"},
});
const initramfs_install = b.addInstallBinFile(initramfs.obj, "initramfs.img");
initramfs_install.step.dependOn(&truncate(b, initramfs).step);
var floppy = createFloppy(b, "main_floppy.img");
floppy.run = formatFloppyFat12(b, floppy);
b.getInstallStep().dependOn(&initramfs_install.step);
const img_install = b.addInstallBinFile(floppy.obj, "main_floppy.img");
img_install.step.dependOn(&installImgToFloppy(b, floppy, initramfs, kernel).step);
b.getInstallStep().dependOn(&img_install.step);
const run = b.addSystemCommand(&.{ "qemu-system-i386", "-fda" });
run.addFileArg(b.path("zig-out/bin/initramfs.img"));
@ -26,7 +33,6 @@ pub fn build(b: *std.Build) void {
const AddNasmFilesOptions = struct {
filename: []const u8,
outputname: ?[]const u8 = null,
addAsObjFile: bool = true,
flags: []const []const u8 = &.{},
};
@ -35,6 +41,46 @@ const NasmFile = struct {
obj: std.Build.LazyPath,
};
const Floppydisk = NasmFile;
fn createFloppy(b: *std.Build, name: []const u8) Floppydisk {
const dd = b.addSystemCommand(&.{ "dd", "if=/dev/zero" });
const Floppy = dd.addPrefixedOutputFileArg("of=", name);
dd.addArgs(&.{ "bs=512", "count=2880" });
return Floppydisk{
.run = dd,
.obj = Floppy,
};
}
fn formatFloppyFat12(b: *std.Build, floppy: Floppydisk) *std.Build.Step.Run {
const mkfs = b.addSystemCommand(&.{ "mkfs.fat", "-F12", "-nNBOS" });
mkfs.addFileArg(floppy.obj);
mkfs.step.dependOn(&floppy.run.step);
return mkfs;
}
fn installImgToFloppy(b: *std.Build, floppy: Floppydisk, bootloader: NasmFile, kernel: NasmFile) *std.Build.Step.Run {
const dd = b.addSystemCommand(&.{"dd"});
dd.addPrefixedFileArg("if=", bootloader.obj);
dd.addPrefixedFileArg("of=", floppy.obj);
dd.addArg("conv=notrunc");
dd.step.dependOn(&floppy.run.step);
dd.step.dependOn(&bootloader.run.step);
const mcopy = b.addSystemCommand(&.{"mcopy"});
mcopy.addPrefixedFileArg("-i", floppy.obj);
mcopy.addFileArg(kernel.obj);
mcopy.addArg("::kernel.bin");
mcopy.step.dependOn(&dd.step);
mcopy.step.dependOn(&kernel.run.step);
return mcopy;
}
// adapted from https://codeberg.org/raddari/zig-nasm-lib.git
fn addNasmFiles(b: *std.Build, options: AddNasmFilesOptions) NasmFile {
std.debug.assert(!std.fs.path.isAbsolute(options.filename));
@ -52,12 +98,3 @@ fn addNasmFiles(b: *std.Build, options: AddNasmFilesOptions) NasmFile {
.obj = obj,
};
}
fn truncate(b: *std.Build, bin: NasmFile) *std.Build.Step.Run {
const exec = b.addSystemCommand(&.{"truncate"});
exec.addArgs(&.{ "-s", "1440k" });
exec.addFileArg(bin.obj);
exec.step.dependOn(&bin.run.step);
return exec;
}