pluto/src/kernel/arch.zig

const builtin = @import("builtin");
const is_test = builtin.is_test;
const build_options = @import("build_options");

pub const internals = if (is_test) @import(build_options.mock_path ++ "arch_mock.zig") else switch (builtin.arch) {
    .i386 => @import("arch/x86/arch.zig"),
    else => unreachable,
};