diff options
Diffstat (limited to 'build.zig')
| -rw-r--r-- | build.zig | 319 |
1 files changed, 229 insertions, 90 deletions
@@ -1,136 +1,275 @@ const std = @import("std"); -// the gils coreutils -const gils_tools = .{ "gils", "ls", "tree", "cat", "rm", "mkdir", "touch", "cp", "mv", "wc", "head", "tail", "ed" }; +const boot_gils = [_][]const u8{ "gils", "ed" }; + +const user_cc = [_][]const u8{ + "zig", "cc", + "-target", "x86_64-freestanding", + "-ffreestanding", "-nostdlib", + "-static", "-no-pie", + "-fno-stack-protector", "-fno-sanitize=all", + "-Wall", "-Wextra", + "-Werror", "-Wpedantic", + "-I", "sysroot/usr/include", + "-Wl,-T,user/link.ld", "-Wl,--build-id=none", + "-o", +}; pub fn build(b: *std.Build) void { - // Default to ReleaseSafe because Debug pulls Zig's UBSan runtime and other - // sanitization, which needs f128/SSE ops, which i don't provide. const optimize = b.option(std.builtin.OptimizeMode, "optimize", "optimize mode") orelse .safe; + const target = kernelTarget(b); + + const kernel = buildKernel(b, target, optimize); + kernel.root_module.addImport("kasset", buildKernelAssets(b, target, optimize)); + kernel.root_module.addImport("bridge", buildBridge(b, target, optimize)); + + b.installArtifact(kernel); +} - // The kernel must NOT touch SSE/MMX/AVX until it has enabled them itself, so - // I strip those features and let the compiler use a soft-float ABI - // `code_model = .kernel` keeps relocations valid for the higher-half load - // address in boot/linker.ld. - // - // In other words. Going raw baby +fn kernelTarget(b: *std.Build) std.Build.ResolvedTarget { var query: std.Target.Query = .{ .cpu_arch = .x86_64, .os_tag = .freestanding, .abi = .none, }; - const Feature = std.Target.x86.Feature; query.cpu_features_sub.addFeature(@backingInt(Feature.mmx)); query.cpu_features_sub.addFeature(@backingInt(Feature.avx)); query.cpu_features_sub.addFeature(@backingInt(Feature.avx2)); + return b.resolveTargetQuery(query); +} - const target = b.resolveTargetQuery(query); +fn kernelModule( + b: *std.Build, + target: std.Build.ResolvedTarget, + optimize: std.builtin.OptimizeMode, + root: std.Build.LazyPath, +) *std.Build.Module { + return b.createModule(.{ + .root_source_file = root, + .target = target, + .optimize = optimize, + .code_model = .kernel, + .red_zone = false, + .single_threaded = true, + .link_libc = false, + }); +} +fn buildKernel( + b: *std.Build, + target: std.Build.ResolvedTarget, + optimize: std.builtin.OptimizeMode, +) *std.Build.Step.Compile { const kernel = b.addExecutable(.{ .name = "revel", - .root_module = b.createModule(.{ - .root_source_file = b.path("boot/boot.zig"), - .target = target, - .optimize = optimize, - .code_model = .kernel, - .red_zone = false, - .single_threaded = true, - .link_libc = false, - }), + .root_module = kernelModule(b, target, optimize, b.path("boot/boot.zig")), }); kernel.entry = .{ .symbol_name = "_start" }; kernel.pie = false; kernel.setLinkerScript(b.path("boot/linker.ld")); + return kernel; +} + +fn buildBridge( + b: *std.Build, + target: std.Build.ResolvedTarget, + optimize: std.builtin.OptimizeMode, +) *std.Build.Module { + const bridge = kernelModule(b, target, optimize, b.path("bridge/bridge.zig")); - // the big guns - const revo_dep = b.dependency("revo", .{ + const revo = b.dependency("revo", .{ .target = target, .optimize = optimize, .features = "regex", - }); - const revo_mod = revo_dep.module("revo"); - + }).module("revo"); var visited: std.AutoHashMap(*std.Build.Module, void) = .init(b.allocator); defer visited.deinit(); - kernelize(revo_mod, &visited); + kernelize(revo, &visited); + bridge.addImport("revo", revo); - // the thin guns - const bridge_mod = b.createModule(.{ - .root_source_file = b.path("bridge/bridge.zig"), - .target = target, - .optimize = optimize, - .code_model = .kernel, - .red_zone = false, - .single_threaded = true, - .link_libc = false, - }); - bridge_mod.addImport("revo", revo_mod); - inline for (.{ - .{ "k_font", "kernel/font.rv" }, - .{ "k_console", "kernel/console.rv" }, - .{ "k_vmm", "kernel/vmm.rv" }, - .{ "k_fs", "kernel/fs.rv" }, - .{ "k_io", "kernel/io.rv" }, - .{ "k_vfs", "kernel/vfs.rv" }, - .{ "k_seed", "kernel/seed.rv" }, - .{ "k_proc", "kernel/proc.rv" }, - .{ "k_ttf", "kernel/ttf.rv" }, - .{ "k_shell", "kernel/shell.rv" }, - .{ "k_tty", "kernel/tty.rv" }, - .{ "k_input", "kernel/input.rv" }, - .{ "k_main", "kernel/main.rv" }, - }) |e| { - bridge_mod.addAnonymousImport(e[0], .{ .root_source_file = b.path(e[1]) }); + for (scan(b, "kernel", ".rv")) |file| { + const name = stripExt(file); + bridge.addAnonymousImport(b.fmt("k_{s}", .{name}), .{ + .root_source_file = b.path(b.fmt("kernel/{s}", .{file})), + }); + } + for (boot_gils) |name| { + bridge.addAnonymousImport(b.fmt("k_gils_{s}", .{name}), .{ + .root_source_file = b.path(b.fmt("gils/{s}.rv", .{name})), + }); } - // load gils - inline for (gils_tools) |g| { - bridge_mod.addAnonymousImport("k_gils_" ++ g, .{ .root_source_file = b.path("gils/" ++ g ++ ".rv") }); + bridge.addImport("basset", buildBridgeAssets(b, target, optimize)); + return bridge; +} + +fn buildBridgeAssets( + b: *std.Build, + target: std.Build.ResolvedTarget, + optimize: std.builtin.OptimizeMode, +) *std.Build.Module { + var embeds = Embeds{ .b = b }; + var src: []const u8 = + \\// generated by build.zig + \\pub const Blob = struct { name: []const u8, src: []const u8 }; + \\ + \\ + ; + + src = b.fmt("{s}pub const gils = [_]Blob{{\n", .{src}); + for (scan(b, "gils", ".rv")) |file| { + const name = stripExt(file); + if (contains(&boot_gils, name)) continue; + const key = b.fmt("k_gils_{s}", .{name}); + embeds.add(key, b.path(b.fmt("gils/{s}", .{file}))); + src = b.fmt("{s} .{{ .name = \"{s}\", .src = @embedFile(\"{s}\") }},\n", .{ src, name, key }); } - // /etc/ bullshit - inline for (.{ "motd", "profile", "lung" }) |name| { - bridge_mod.addAnonymousImport("k_etc_" ++ name, .{ .root_source_file = b.path("etc/" ++ name) }); + src = b.fmt("{s}}};\n\npub const etc = [_]Blob{{\n", .{src}); + for (scan(b, "sysroot/etc", "")) |file| { + const key = b.fmt("k_etc_{s}", .{sanitize(b, file)}); + embeds.add(key, b.path(b.fmt("sysroot/etc/{s}", .{file}))); + src = b.fmt("{s} .{{ .name = \"{s}\", .src = @embedFile(\"{s}\") }},\n", .{ src, file, key }); } - kernel.root_module.addImport("bridge", bridge_mod); + src = b.fmt("{s}}};\n\npub const include = [_]Blob{{\n", .{src}); + for (headers(b)) |path| { + const key = b.fmt("k_inc_{s}", .{sanitize(b, path)}); + embeds.add(key, b.path(b.fmt("sysroot/usr/include/{s}", .{path}))); + src = b.fmt("{s} .{{ .name = \"{s}\", .src = @embedFile(\"{s}\") }},\n", .{ src, path, key }); + } - inline for (.{ - .{ "font_vga16", "fonts/vga16.psf" }, - .{ "font_vga8", "fonts/vga8.psf" }, - .{ "font_sun16", "fonts/sun16.psf" }, - .{ "font_acorn8", "fonts/acorn8.psf" }, - .{ "font_pearl8", "fonts/pearl8.psf" }, - .{ "font_dejavu", "fonts/dejavu.ttf" }, - .{ "font_terminess", "fonts/terminess.ttf" }, - }) |e| { - kernel.root_module.addAnonymousImport(e[0], .{ .root_source_file = b.path(e[1]) }); + src = b.fmt("{s}}};\n", .{src}); + const mod = kernelModule(b, target, optimize, b.addWriteFiles().add("basset.zig", src)); + embeds.apply(mod); + return mod; +} + +fn buildKernelAssets( + b: *std.Build, + target: std.Build.ResolvedTarget, + optimize: std.builtin.OptimizeMode, +) *std.Build.Module { + var embeds = Embeds{ .b = b }; + var src: []const u8 = + \\// generated by build.zig + \\pub const Blob = struct { name: []const u8, bytes: []const u8 }; + \\ + \\ + ; + + src = b.fmt("{s}pub const fonts = [_]Blob{{\n", .{src}); + for (scan(b, "sysroot/usr/share", "")) |file| { + const key = b.fmt("font_{s}", .{sanitize(b, file)}); + embeds.add(key, b.path(b.fmt("sysroot/usr/share/{s}", .{file}))); + src = b.fmt("{s} .{{ .name = \"{s}\", .bytes = @embedFile(\"{s}\") }},\n", .{ src, file, key }); + } + src = b.fmt("{s}}};\n\npub const programs = [_]Blob{{\n", .{src}); + for (scan(b, "user", ".c")) |file| { + const name = stripExt(file); + const key = b.fmt("user_{s}", .{name}); + embeds.add(key, compileProgram(b, name)); + src = b.fmt("{s} .{{ .name = \"{s}\", .bytes = @embedFile(\"{s}\") }},\n", .{ src, name, key }); } + src = b.fmt("{s}}};\n", .{src}); - inline for (.{ "hexview", "calc", "primes", "save", "chat", "membrk" }) |prog| { - const cc = b.addSystemCommand(&.{ - "zig", "cc", - "-target", "x86_64-freestanding", - "-ffreestanding", "-nostdlib", - "-static", "-no-pie", - "-fno-stack-protector", "-fno-sanitize=all", - "-Wall", "-Wextra", - "-Werror", "-Wpedantic", - "-Wl,-T,user/link.ld", "-Wl,--build-id=none", - "-o", - }); - const prog_elf = cc.addOutputFileArg(prog ++ ".elf"); - cc.addFileArg(b.path("user/" ++ prog ++ ".c")); - cc.addFileInput(b.path("user/user.h")); - cc.addFileInput(b.path("user/link.ld")); - kernel.root_module.addAnonymousImport("user_" ++ prog, .{ .root_source_file = prog_elf }); + const mod = kernelModule(b, target, optimize, b.addWriteFiles().add("kasset.zig", src)); + embeds.apply(mod); + return mod; +} + +fn compileProgram(b: *std.Build, name: []const u8) std.Build.LazyPath { + const cc = b.addSystemCommand(&user_cc); + const elf = cc.addOutputFileArg(b.fmt("{s}.elf", .{name})); + + cc.addFileArg(b.path(b.fmt("user/{s}.c", .{name}))); + for (scan(b, "sysroot/usr/lib/libc", ".c")) |unit| + cc.addFileArg(b.path(b.fmt("sysroot/usr/lib/libc/{s}", .{unit}))); + + for (headers(b)) |path| + cc.addFileInput(b.path(b.fmt("sysroot/usr/include/{s}", .{path}))); + cc.addFileInput(b.path("user/link.ld")); + + return elf; +} + +fn scan(b: *std.Build, dir_path: []const u8, ext: []const u8) [][]const u8 { + const io = b.graph.io; + var dir = std.Io.Dir.cwd().openDir(io, dir_path, .{ .iterate = true }) catch |err| + std.debug.panic("build: cannot scan {s}: {s}", .{ dir_path, @errorName(err) }); + defer dir.close(io); + + var buf: [128][]const u8 = undefined; + var count: usize = 0; + var it = dir.iterate(); + while (it.next(io) catch @panic("build: dir iterate failed")) |entry| { + if (entry.kind != .file) continue; + if (!std.mem.endsWith(u8, entry.name, ext)) continue; + buf[count] = b.allocator.dupe(u8, entry.name) catch @panic("OOM"); + count += 1; } - b.installArtifact(kernel); + const names = b.allocator.dupe([]const u8, buf[0..count]) catch @panic("OOM"); + std.mem.sort([]const u8, names, {}, lessThan); + return names; +} + +fn headers(b: *std.Build) [][]const u8 { + var buf: [128][]const u8 = undefined; + var count: usize = 0; + for (scan(b, "sysroot/usr/include", ".h")) |name| { + buf[count] = name; + count += 1; + } + for (scan(b, "sysroot/usr/include/sys", ".h")) |name| { + buf[count] = b.fmt("sys/{s}", .{name}); + count += 1; + } + return b.allocator.dupe([]const u8, buf[0..count]) catch @panic("OOM"); +} + +fn lessThan(_: void, a: []const u8, c: []const u8) bool { + return std.mem.lessThan(u8, a, c); +} + +fn stripExt(name: []const u8) []const u8 { + const dot = std.mem.lastIndexOfScalar(u8, name, '.') orelse return name; + return name[0..dot]; +} + +fn sanitize(b: *std.Build, name: []const u8) []const u8 { + const out = b.allocator.dupe(u8, name) catch @panic("OOM"); + for (out) |*ch| { + if (!std.ascii.isAlphanumeric(ch.*)) ch.* = '_'; + } + return out; +} + +const Embeds = struct { + b: *std.Build, + keys: [128][]const u8 = undefined, + paths: [128]std.Build.LazyPath = undefined, + count: usize = 0, + + fn add(self: *Embeds, key: []const u8, path: std.Build.LazyPath) void { + self.keys[self.count] = key; + self.paths[self.count] = path; + self.count += 1; + } + + fn apply(self: *Embeds, module: *std.Build.Module) void { + for (0..self.count) |i| + module.addAnonymousImport(self.keys[i], .{ .root_source_file = self.paths[i] }); + } +}; + +fn contains(haystack: []const []const u8, needle: []const u8) bool { + for (haystack) |item| + if (std.mem.eql(u8, item, needle)) return true; + return false; } -// force a module and everything it imports to the kernel's codegen settings fn kernelize(mod: *std.Build.Module, visited: *std.AutoHashMap(*std.Build.Module, void)) void { if (visited.contains(mod)) return; visited.put(mod, {}) catch @panic("OOM building module graph"); |