- vm_allocate()
- vm_deallocate()
- vm_map()
- mach_make_memory_entry()

I think they're meant to be used interchangeably, just typedefed to have more
clear names for certain contexts

procs:
| type          | old  | new (matching c api)|
| ---           | ---- | ------------------- |
| kern_return_t | u64  | c.int               |
| thread_t      | u64  | mach_port_t         |
| task_t        | u64  | mach_port_t         |
| semaphore_t   | u64  | mach_port_t         |

for mach_task_self(), return mach_port_t instead of task_t

for semaphore_signal_thread(), accept a thread_t instead of a thread_act_t