Module mmap 

Memory-management syscall handlers: mmap, munmap, brk.

Implements:

• sys_mmap – map anonymous virtual memory (SYS_MMAP = 100)
• sys_munmap – unmap a virtual memory range (SYS_MUNMAP = 101)
• sys_brk – set / query the program break / heap top (SYS_BRK = 102)
• sys_mremap – resize/remap an existing region (SYS_MREMAP = 103)
• sys_mprotect – change page permissions (SYS_MPROTECT = 104)

Constants

BRK_BASE

Base virtual address for the heap (brk-managed region).

MMAP_BASE

Initial hint address for anonymous mmap allocations.

Functions

sys_brk

SYS_BRK (102): set or query the program break (top of heap).

sys_mmap

SYS_MMAP (100): map anonymous virtual memory.

sys_mprotect

SYS_MPROTECT (104): change permissions in an existing mapping range.

sys_mremap

SYS_MREMAP (103): resize an existing mapping.

sys_munmap

SYS_MUNMAP (101): unmap a virtual memory range.