pub const VM = struct {
    pub const INHERIT = struct {
        pub const SHARE: vm_inherit_t = 0;
        pub const COPY: vm_inherit_t = 1;
        pub const NONE: vm_inherit_t = 2;
        pub const DONATE_COPY: vm_inherit_t = 3;
        pub const DEFAULT = COPY;
    };

    pub const BEHAVIOR = struct {
        pub const DEFAULT: vm_behavior_t = 0;
        pub const RANDOM: vm_behavior_t = 1;
        pub const SEQUENTIAL: vm_behavior_t = 2;
        pub const RSEQNTL: vm_behavior_t = 3;
        pub const WILLNEED: vm_behavior_t = 4;
        pub const DONTNEED: vm_behavior_t = 5;
        pub const FREE: vm_behavior_t = 6;
        pub const ZERO_WIRED_PAGES: vm_behavior_t = 7;
        pub const REUSABLE: vm_behavior_t = 8;
        pub const REUSE: vm_behavior_t = 9;
        pub const CAN_REUSE: vm_behavior_t = 10;
        pub const PAGEOUT: vm_behavior_t = 11;
    };

    pub const REGION = struct {
        pub const BASIC_INFO_64 = 9;
        pub const EXTENDED_INFO = 13;
        pub const TOP_INFO = 12;
        pub const SUBMAP_INFO_COUNT_64: mach_msg_type_number_t = @sizeOf(vm_region_submap_info_64) / @sizeOf(natural_t);
        pub const SUBMAP_SHORT_INFO_COUNT_64: mach_msg_type_number_t = @sizeOf(vm_region_submap_short_info_64) / @sizeOf(natural_t);
        pub const BASIC_INFO_COUNT: mach_msg_type_number_t = @sizeOf(vm_region_basic_info_64) / @sizeOf(c_int);
        pub const EXTENDED_INFO_COUNT: mach_msg_type_number_t = @sizeOf(vm_region_extended_info) / @sizeOf(natural_t);
        pub const TOP_INFO_COUNT: mach_msg_type_number_t = @sizeOf(vm_region_top_info) / @sizeOf(natural_t);
    };

    pub fn MAKE_TAG(tag: u8) u32 {
        return @as(u32, tag) << 24;
    }
}