page_size_min_default

const page_size_min_default: ?usize = switch (builtin.os.tag) {
    .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => switch (builtin.cpu.arch) {
        .x86_64 => 4 << 10,
        .aarch64 => 16 << 10,
        else => null,
    },
    .windows => switch (builtin.cpu.arch) {
        // -- <https://devblogs.microsoft.com/oldnewthing/20210510-00/?p=105200>
        .x86, .x86_64 => 4 << 10,
        // SuperH => 4 << 10,
        .mips, .mipsel, .mips64, .mips64el => 4 << 10,
        .powerpc, .powerpcle, .powerpc64, .powerpc64le => 4 << 10,
        // DEC Alpha => 8 << 10,
        // Itanium => 8 << 10,
        .thumb, .thumbeb, .arm, .armeb, .aarch64, .aarch64_be => 4 << 10,
        else => null,
    },
    .wasi => switch (builtin.cpu.arch) {
        .wasm32, .wasm64 => 64 << 10,
        else => null,
    },
    // https://github.com/tianocore/edk2/blob/b158dad150bf02879668f72ce306445250838201/MdePkg/Include/Uefi/UefiBaseType.h#L180-L187
    .uefi => 4 << 10,
    .freebsd => switch (builtin.cpu.arch) {
        // FreeBSD/sys/*
        .x86, .x86_64 => 4 << 10,
        .thumb, .thumbeb, .arm, .armeb => 4 << 10,
        .aarch64, .aarch64_be => 4 << 10,
        .powerpc, .powerpc64, .powerpc64le, .powerpcle => 4 << 10,
        .riscv32, .riscv64 => 4 << 10,
        else => null,
    },
    .netbsd => switch (builtin.cpu.arch) {
        // NetBSD/sys/arch/*
        .alpha => 8 << 10,
        .x86, .x86_64 => 4 << 10,
        .thumb, .thumbeb, .arm, .armeb => 4 << 10,
        .aarch64, .aarch64_be => 4 << 10,
        .hppa => 4 << 10,
        .mips, .mipsel, .mips64, .mips64el => 4 << 10,
        .powerpc, .powerpc64, .powerpc64le, .powerpcle => 4 << 10,
        .sh, .sheb => 4 << 10,
        .sparc => 4 << 10,
        .sparc64 => 8 << 10,
        .riscv32, .riscv64 => 4 << 10,
        // Sun-2
        .m68k => 2 << 10,
        else => null,
    },
    .dragonfly => switch (builtin.cpu.arch) {
        .x86, .x86_64 => 4 << 10,
        else => null,
    },
    .openbsd => switch (builtin.cpu.arch) {
        // OpenBSD/sys/arch/*
        .alpha => 8 << 10,
        .hppa => 4 << 10,
        .x86, .x86_64 => 4 << 10,
        .thumb, .thumbeb, .arm, .armeb, .aarch64, .aarch64_be => 4 << 10,
        .m88k => 4 << 10,
        .mips64, .mips64el => 4 << 10,
        .powerpc, .powerpc64, .powerpc64le, .powerpcle => 4 << 10,
        .riscv64 => 4 << 10,
        .sh, .sheb => 4 << 10,
        .sparc64 => 8 << 10,
        else => null,
    },
    .illumos => switch (builtin.cpu.arch) {
        // src/uts/*/sys/machparam.h
        .x86, .x86_64 => 4 << 10,
        .sparc, .sparc64 => 8 << 10,
        else => null,
    },
    .fuchsia => switch (builtin.cpu.arch) {
        // fuchsia/kernel/arch/*/include/arch/defines.h
        .x86_64 => 4 << 10,
        .aarch64, .aarch64_be => 4 << 10,
        .riscv64 => 4 << 10,
        else => null,
    },
    // https://github.com/SerenityOS/serenity/blob/62b938b798dc009605b5df8a71145942fc53808b/Kernel/API/POSIX/sys/limits.h#L11-L13
    .serenity => 4 << 10,
    .haiku => switch (builtin.cpu.arch) {
        // haiku/headers/posix/arch/*/limits.h
        .thumb, .thumbeb, .arm, .armeb => 4 << 10,
        .aarch64, .aarch64_be => 4 << 10,
        .m68k => 4 << 10,
        .mips, .mipsel, .mips64, .mips64el => 4 << 10,
        .powerpc, .powerpc64, .powerpc64le, .powerpcle => 4 << 10,
        .riscv64 => 4 << 10,
        .sparc64 => 8 << 10,
        .x86, .x86_64 => 4 << 10,
        else => null,
    },
    .hurd => switch (builtin.cpu.arch) {
        // gnumach/*/include/mach/*/vm_param.h
        .x86, .x86_64 => 4 << 10,
        .aarch64 => null,
        else => null,
    },
    .plan9 => switch (builtin.cpu.arch) {
        // 9front/sys/src/9/*/mem.h
        .x86, .x86_64 => 4 << 10,
        .thumb, .thumbeb, .arm, .armeb => 4 << 10,
        .aarch64, .aarch64_be => 4 << 10,
        .mips, .mipsel, .mips64, .mips64el => 4 << 10,
        .powerpc, .powerpcle, .powerpc64, .powerpc64le => 4 << 10,
        .sparc => 4 << 10,
        else => null,
    },
    .ps3 => switch (builtin.cpu.arch) {
        // cell/SDK_doc/en/html/C_and_C++_standard_libraries/stdlib.html
        .powerpc64 => 1 << 20, // 1 MiB
        else => null,
    },
    .ps4 => switch (builtin.cpu.arch) {
        // https://github.com/ps4dev/ps4sdk/blob/4df9d001b66ae4ec07d9a51b62d1e4c5e270eecc/include/machine/param.h#L95
        .x86, .x86_64 => 4 << 10,
        else => null,
    },
    .ps5 => switch (builtin.cpu.arch) {
        // https://github.com/PS5Dev/PS5SDK/blob/a2e03a2a0231a3a3397fa6cd087a01ca6d04f273/include/machine/param.h#L95
        .x86, .x86_64 => 16 << 10,
        else => null,
    },
    .psp => switch (builtin.cpu.arch) {
        // minimum block allocation by testing sceKernel
        .mips, .mipsel => 1 << 8, // 256
        else => null,
    },
    // system/lib/libc/musl/arch/emscripten/bits/limits.h
    .emscripten => 64 << 10,
    .linux => switch (builtin.cpu.arch) {
        // Linux/arch/*/Kconfig
        .alpha => 8 << 10,
        .arc, .arceb => 4 << 10,
        .thumb, .thumbeb, .arm, .armeb => 4 << 10,
        .aarch64, .aarch64_be => 4 << 10,
        .csky => 4 << 10,
        .hexagon => 4 << 10,
        .hppa => 4 << 10,
        .loongarch32, .loongarch64 => 4 << 10,
        .m68k => 4 << 10,
        .microblaze, .microblazeel => 4 << 10,
        .mips, .mipsel, .mips64, .mips64el => 4 << 10,
        .or1k => 8 << 10,
        .powerpc, .powerpc64, .powerpc64le, .powerpcle => 4 << 10,
        .riscv32, .riscv64 => 4 << 10,
        .s390x => 4 << 10,
        .sh, .sheb => 4 << 10,
        .sparc => 4 << 10,
        .sparc64 => 8 << 10,
        .x86, .x86_64 => 4 << 10,
        .xtensa, .xtensaeb => 4 << 10,
        else => null,
    },
    .freestanding, .other => switch (builtin.cpu.arch) {
        .wasm32, .wasm64 => 64 << 10,
        .x86, .x86_64 => 4 << 10,
        .aarch64, .aarch64_be => 4 << 10,
        else => null,
    },
    else => null,
}