rework
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parent
b8c7fc5674
commit
5be9186a2d
1 changed files with 51 additions and 14 deletions
65
build.zig
65
build.zig
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@ -7,14 +7,21 @@ pub fn build(b: *std.Build) void {
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const initramfs = addNasmFiles(b, AddNasmFilesOptions{
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.filename = "src/initramfs.asm",
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.outputname = "initramfs.bin",
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.addAsObjFile = false,
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.flags = &.{"-f bin"},
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});
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const kernel = addNasmFiles(b, AddNasmFilesOptions{
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.filename = "src/kernel.asm",
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.outputname = "kernel.bin",
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.flags = &.{"-f bin"},
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});
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const initramfs_install = b.addInstallBinFile(initramfs.obj, "initramfs.img");
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initramfs_install.step.dependOn(&truncate(b, initramfs).step);
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var floppy = createFloppy(b, "main_floppy.img");
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floppy.run = formatFloppyFat12(b, floppy);
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b.getInstallStep().dependOn(&initramfs_install.step);
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const img_install = b.addInstallBinFile(floppy.obj, "main_floppy.img");
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img_install.step.dependOn(&installImgToFloppy(b, floppy, initramfs, kernel).step);
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b.getInstallStep().dependOn(&img_install.step);
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const run = b.addSystemCommand(&.{ "qemu-system-i386", "-fda" });
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run.addFileArg(b.path("zig-out/bin/initramfs.img"));
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@ -26,7 +33,6 @@ pub fn build(b: *std.Build) void {
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const AddNasmFilesOptions = struct {
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filename: []const u8,
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outputname: ?[]const u8 = null,
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addAsObjFile: bool = true,
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flags: []const []const u8 = &.{},
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};
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@ -35,6 +41,46 @@ const NasmFile = struct {
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obj: std.Build.LazyPath,
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};
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const Floppydisk = NasmFile;
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fn createFloppy(b: *std.Build, name: []const u8) Floppydisk {
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const dd = b.addSystemCommand(&.{ "dd", "if=/dev/zero" });
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const Floppy = dd.addPrefixedOutputFileArg("of=", name);
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dd.addArgs(&.{ "bs=512", "count=2880" });
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return Floppydisk{
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.run = dd,
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.obj = Floppy,
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};
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}
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fn formatFloppyFat12(b: *std.Build, floppy: Floppydisk) *std.Build.Step.Run {
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const mkfs = b.addSystemCommand(&.{ "mkfs.fat", "-F12", "-nNBOS" });
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mkfs.addFileArg(floppy.obj);
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mkfs.step.dependOn(&floppy.run.step);
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return mkfs;
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}
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fn installImgToFloppy(b: *std.Build, floppy: Floppydisk, bootloader: NasmFile, kernel: NasmFile) *std.Build.Step.Run {
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const dd = b.addSystemCommand(&.{"dd"});
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dd.addPrefixedFileArg("if=", bootloader.obj);
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dd.addPrefixedFileArg("of=", floppy.obj);
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dd.addArg("conv=notrunc");
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dd.step.dependOn(&floppy.run.step);
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dd.step.dependOn(&bootloader.run.step);
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const mcopy = b.addSystemCommand(&.{"mcopy"});
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mcopy.addPrefixedFileArg("-i", floppy.obj);
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mcopy.addFileArg(kernel.obj);
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mcopy.addArg("::kernel.bin");
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mcopy.step.dependOn(&dd.step);
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mcopy.step.dependOn(&kernel.run.step);
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return mcopy;
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}
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// adapted from https://codeberg.org/raddari/zig-nasm-lib.git
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fn addNasmFiles(b: *std.Build, options: AddNasmFilesOptions) NasmFile {
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std.debug.assert(!std.fs.path.isAbsolute(options.filename));
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@ -52,12 +98,3 @@ fn addNasmFiles(b: *std.Build, options: AddNasmFilesOptions) NasmFile {
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.obj = obj,
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};
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}
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fn truncate(b: *std.Build, bin: NasmFile) *std.Build.Step.Run {
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const exec = b.addSystemCommand(&.{"truncate"});
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exec.addArgs(&.{ "-s", "1440k" });
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exec.addFileArg(bin.obj);
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exec.step.dependOn(&bin.run.step);
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return exec;
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}
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