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//! Copyright (c) 2025 Freya Murphy <freya@freyacat.org>
const std = @import("std");
const builtin = @import("builtin");
const c_flags = &[_][]const u8{
// lang
"-std=c11",
// warnings
"-Wall",
"-Wextra",
"-pedantic",
// flags
"-fno-pie",
"-fno-stack-protector",
"-fno-omit-frame-pointer",
"-ffreestanding",
"-fno-builtin",
// symbols
"-ggdb",
};
const kernel_src = &[_][]const u8{
"kernel/entry.S", // must be first
"kernel/main.c", // main function
"kernel/cpu/cpu.c",
"kernel/cpu/fpu.c",
"kernel/cpu/idt.c",
"kernel/cpu/idt.S",
"kernel/cpu/pic.c",
"kernel/drivers/acpi.c",
"kernel/drivers/clock.c",
"kernel/drivers/drivers.c",
"kernel/drivers/pci.c",
"kernel/drivers/term.c",
"kernel/drivers/uart.c",
"kernel/fs/fs.c",
"kernel/lib/atox.c",
"kernel/lib/backtrace.c",
"kernel/lib/bound.c",
"kernel/lib/btoa.c",
"kernel/lib/ctoi.c",
"kernel/lib/isdigit.c",
"kernel/lib/isspace.c",
"kernel/lib/itoc.c",
"kernel/lib/kalloc.c",
"kernel/lib/kprintf.c",
"kernel/lib/memcmp.c",
"kernel/lib/memcpy.c",
"kernel/lib/memcpyv.c",
"kernel/lib/memmove.c",
"kernel/lib/memmovev.c",
"kernel/lib/memset.c",
"kernel/lib/memsetv.c",
"kernel/lib/panic.c",
"kernel/lib/stpcpy.c",
"kernel/lib/stpncpy.c",
"kernel/lib/strcat.c",
"kernel/lib/strcpy.c",
"kernel/lib/strlen.c",
"kernel/lib/strncmp.c",
"kernel/lib/strncpy.c",
"kernel/lib/strtoux.c",
"kernel/lib/strtox.c",
"kernel/lib/uxtoa.c",
"kernel/lib/xtoa.c",
"kernel/mboot/mboot.c",
"kernel/mboot/mmap.c",
"kernel/mboot/rsdp.c",
"kernel/memory/memory.c",
"kernel/memory/paging.c",
"kernel/memory/physalloc.c",
"kernel/memory/virtalloc.c",
};
const Prog = struct {
name: []const u8,
source: []const []const u8,
};
const AddSourcesOpts = struct { exe: *std.Build.Step.Compile, sources: []const []const []const u8, c_flags: []const []const u8 };
fn add_sources(b: *std.Build, opts: AddSourcesOpts) void {
// add asm and c source files
for (opts.sources) |source| {
for (source) |file| {
if (std.mem.endsWith(u8, file, ".c")) {
// c file
opts.exe.addCSourceFile(.{ .file = b.path(file), .flags = opts.c_flags });
} else {
// assembly file
opts.exe.addAssemblyFile(b.path(file));
}
}
}
}
const BuildKernBinaryOpts = struct {
name: []const u8,
target: std.Build.ResolvedTarget,
optimize: std.builtin.OptimizeMode,
sources: []const []const []const u8,
linker: ?[]const u8 = null,
entry: []const u8 = "_start",
strip: bool = false,
include: ?[]const u8 = null,
};
fn build_kern_binary(b: *std.Build, opts: BuildKernBinaryOpts) void {
// create compile step
const exe = b.addExecutable(.{
.name = opts.name,
.target = opts.target,
.optimize = opts.optimize,
.strip = opts.strip,
});
// add include path
if (opts.include != null) {
exe.addIncludePath(b.path(opts.include.?));
}
// set entry
exe.entry = .{ .symbol_name = opts.entry };
// add asm and c source files
add_sources(b, .{
.exe = exe,
.sources = opts.sources,
.c_flags = c_flags,
});
if (opts.linker != null) {
exe.setLinkerScript(b.path(opts.linker.?));
}
const step = b.addInstallArtifact(exe, .{ .dest_dir = .{
.override = .{ .custom = "../bin" },
} });
b.getInstallStep().dependOn(&step.step);
}
const BuildNativeBinaryOpts = struct {
name: []const u8,
optimize: std.builtin.OptimizeMode,
sources: []const []const []const u8,
};
fn build_native_binary(b: *std.Build, opts: BuildNativeBinaryOpts) void {
// create compile step
const exe = b.addExecutable(.{
.name = opts.name,
.target = b.graph.host,
.optimize = opts.optimize,
.strip = true,
});
// include libc
exe.linkLibC();
// add asm and c source files
add_sources(b, .{
.exe = exe,
.sources = opts.sources,
.c_flags = &.{},
});
const step = b.addInstallArtifact(exe, .{ .dest_dir = .{
.override = .{ .custom = "../bin" },
} });
b.getInstallStep().dependOn(&step.step);
}
pub fn build(b: *std.Build) !void {
// context
const target64 = std.Build.resolveTargetQuery(b, .{
.cpu_arch = std.Target.Cpu.Arch.x86_64,
.os_tag = std.Target.Os.Tag.freestanding,
.abi = std.Target.Abi.gnu,
.ofmt = std.Target.ObjectFormat.elf,
});
const optimize = std.builtin.OptimizeMode.ReleaseFast;
// kernel
build_kern_binary(b, .{
.name = "kernel",
.target = target64,
.optimize = optimize,
.sources = &.{
kernel_src,
},
.linker = "config/kernel.ld",
.include = "kernel/include",
});
}
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