started project with basic efi setup

2026-07-01 18:32:56 +01:00
commit 3c8656fb25
7 changed files with 225 additions and 0 deletions
@@ -0,0 +1,110 @@
+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);
+}