started project with basic efi setup

.gitignore

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+# Zig build outputs
+.zig-cache/
+zig-out/
+
+# JetBrains IDE
+.idea/

README.md

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+DanOS
+====
+
+Operating System written for me

build.zig

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+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const mod = b.addModule("danos", .{
+        .root_source_file = b.path("src/root.zig"),
+        .target = target,
+    });
+
+    const exe = b.addExecutable(.{
+        .name = "danos",
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/main.zig"),
+            .target = target,
+            .optimize = optimize,
+            .imports = &.{
+                .{ .name = "danos", .module = mod },
+            },
+        }),
+    });
+
+    b.installArtifact(exe);
+
+    const efiexe = b.addExecutable(.{
+        .name = "BOOTX64",
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/efi.zig"),
+            .target = b.resolveTargetQuery(.{
+                .cpu_arch = .x86_64,
+                .os_tag = .uefi,
+            }),
+            .optimize = optimize,
+        }),
+    });
+
+    b.installArtifact(efiexe);
+
+    // --- run-efi: boot BOOTX64.efi in QEMU with OVMF firmware ---
+    // OVMF paths follow the Arch (edk2-ovmf) layout; override with -Dovmf-code
+    // and -Dovmf-vars if your distro installs them elsewhere.
+    const ovmf_code = b.option(
+        []const u8,
+        "ovmf-code",
+        "Path to the OVMF_CODE firmware image",
+    ) orelse "/usr/share/edk2/x64/OVMF_CODE.4m.fd";
+    const ovmf_vars = b.option(
+        []const u8,
+        "ovmf-vars",
+        "Path to the OVMF_VARS firmware image (a writable copy is made)",
+    ) orelse "/usr/share/edk2/x64/OVMF_VARS.4m.fd";
+
+    // Assemble an EFI System Partition layout: esp/EFI/BOOT/BOOTX64.efi
+    const efi_install = b.addInstallArtifact(efiexe, .{
+        .dest_dir = .{ .override = .{ .custom = "esp/EFI/BOOT" } },
+    });
+
+    // The firmware needs to write NVRAM, so give it a writable copy of the vars.
+    const vars_copy = b.addSystemCommand(&.{ "cp", "-f", ovmf_vars });
+    const vars_out = vars_copy.addOutputFileArg("OVMF_VARS.4m.fd");
+
+    const run_efi = b.addSystemCommand(&.{
+        "qemu-system-x86_64",
+        "-machine",
+        "q35",
+        "-m",
+        "128M",
+        "-drive",
+        b.fmt("if=pflash,format=raw,readonly=on,file={s}", .{ovmf_code}),
+    });
+    run_efi.addArg("-drive");
+    run_efi.addPrefixedFileArg("if=pflash,format=raw,file=", vars_out);
+    // Present the ESP directory to the guest as a FAT drive.
+    run_efi.addArgs(&.{
+        "-drive",
+        b.fmt("format=raw,file=fat:rw:{s}/esp", .{b.install_path}),
+        "-net",
+        "none",
+    });
+    run_efi.step.dependOn(&efi_install.step);
+
+    const run_efi_step = b.step("run-efi", "Boot the EFI app in QEMU (OVMF)");
+    run_efi_step.dependOn(&run_efi.step);
+
+    // const run_cmd = b.addRunArtifact(exe);
+    // const run_step = b.step("run", "Run the app");
+    // run_step.dependOn(&run_cmd.step);
+    // run_cmd.step.dependOn(b.getInstallStep());
+    //
+    // if (b.args) |args| {
+    //     run_cmd.addArgs(args);
+    // }
+
+    const mod_tests = b.addTest(.{
+        .root_module = mod,
+    });
+
+    const run_mod_tests = b.addRunArtifact(mod_tests);
+
+    const exe_tests = b.addTest(.{
+        .root_module = exe.root_module,
+    });
+
+    const run_exe_tests = b.addRunArtifact(exe_tests);
+
+    const test_step = b.step("test", "Run tests");
+    test_step.dependOn(&run_mod_tests.step);
+    test_step.dependOn(&run_exe_tests.step);
+}

build.zig.zon

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+.{
+    // This is the default name used by packages depending on this one. For
+    // example, when a user runs `zig fetch --save <url>`, this field is used
+    // as the key in the `dependencies` table. Although the user can choose a
+    // different name, most users will stick with this provided value.
+    //
+    // It is redundant to include "zig" in this name because it is already
+    // within the Zig package namespace.
+    .name = .danos,
+    // This is a [Semantic Version](https://semver.org/).
+    // In a future version of Zig it will be used for package deduplication.
+    .version = "0.0.0",
+    // Together with name, this represents a globally unique package
+    // identifier. This field is generated by the Zig toolchain when the
+    // package is first created, and then *never changes*. This allows
+    // unambiguous detection of one package being an updated version of
+    // another.
+    //
+    // When forking a Zig project, this id should be regenerated (delete the
+    // field and run `zig build`) if the upstream project is still maintained.
+    // Otherwise, the fork is *hostile*, attempting to take control over the
+    // original project's identity. Thus it is recommended to leave the comment
+    // on the following line intact, so that it shows up in code reviews that
+    // modify the field.
+    .fingerprint = 0x402a07325b01d626, // Changing this has security and trust implications.
+    // Tracks the earliest Zig version that the package considers to be a
+    // supported use case.
+    .minimum_zig_version = "0.16.0",
+    // This field is optional.
+    // Each dependency must either provide a `url` and `hash`, or a `path`.
+    // `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
+    // Once all dependencies are fetched, `zig build` no longer requires
+    // internet connectivity.
+    .dependencies = .{
+        // See `zig fetch --save <url>` for a command-line interface for adding dependencies.
+        //.example = .{
+        //    // When updating this field to a new URL, be sure to delete the corresponding
+        //    // `hash`, otherwise you are communicating that you expect to find the old hash at
+        //    // the new URL. If the contents of a URL change this will result in a hash mismatch
+        //    // which will prevent zig from using it.
+        //    .url = "https://example.com/foo.tar.gz",
+        //
+        //    // This is computed from the file contents of the directory of files that is
+        //    // obtained after fetching `url` and applying the inclusion rules given by
+        //    // `paths`.
+        //    //
+        //    // This field is the source of truth; packages do not come from a `url`; they
+        //    // come from a `hash`. `url` is just one of many possible mirrors for how to
+        //    // obtain a package matching this `hash`.
+        //    //
+        //    // Uses the [multihash](https://multiformats.io/multihash/) format.
+        //    .hash = "...",
+        //
+        //    // When this is provided, the package is found in a directory relative to the
+        //    // build root. In this case the package's hash is irrelevant and therefore not
+        //    // computed. This field and `url` are mutually exclusive.
+        //    .path = "foo",
+        //
+        //    // When this is set to `true`, a package is declared to be lazily
+        //    // fetched. This makes the dependency only get fetched if it is
+        //    // actually used.
+        //    .lazy = false,
+        //},
+    },
+    // Specifies the set of files and directories that are included in this package.
+    // Only files and directories listed here are included in the `hash` that
+    // is computed for this package. Only files listed here will remain on disk
+    // when using the zig package manager. As a rule of thumb, one should list
+    // files required for compilation plus any license(s).
+    // Paths are relative to the build root. Use the empty string (`""`) to refer to
+    // the build root itself.
+    // A directory listed here means that all files within, recursively, are included.
+    .paths = .{
+        "build.zig",
+        "build.zig.zon",
+        "src",
+        // For example...
+        //"LICENSE",
+        //"README.md",
+    },
+}

src/efi.zig

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+const std = @import("std");
+const uefi = std.os.uefi;
+
+pub fn main() uefi.Status {
+    // std's start code populates these globals before calling main.
+    const con_out = uefi.system_table.con_out orelse return .device_error;
+
+    // UEFI console output expects a null-terminated UTF-16 string.
+    const message = std.unicode.utf8ToUtf16LeStringLiteral("Hello from Zig UEFI!\r\n");
+    _ = con_out.outputString(message) catch {};
+
+    while (true) {}
+
+    return .success;
+}

src/main.zig

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+const std = @import("std");
+const Io = std.Io;
+
+const danos = @import("danos");
+
+pub fn main() !void {
+
+}

src/root.zig

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+//! By convention, root.zig is the root source file when making a package.