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).

MAP_ANONYMOUS 🔒

MAP_FIXED 🔒

MAP_FIXED_NOREPLACE 🔒

MAP_HUGETLB 🔒

MAP_PRIVATE 🔒

MAP_SHARED 🔒

MMAP_BASE

Initial hint address for anonymous mmap allocations.

MREMAP_MAYMOVE 🔒

PROT_EXEC 🔒

PROT_READ 🔒

PROT_WRITE 🔒

USER_SPACE_END 🔒

Exclusive upper bound of the canonical user-space address range.

Functions

huge_page_align_up 🔒

Round addr up to the nearest 2 MiB boundary.

page_align_up 🔒

Round addr up to the nearest 4 KiB page boundary.

prot_to_vma_flags 🔒

Convert POSIX protection flags to VmaFlags.

sys_brk

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

sys_mem_region_export

SYS_MEM_REGION_EXPORT (105): export a tracked region as a public handle.

sys_mem_region_info

SYS_MEM_REGION_INFO (107): query metadata about an exported region.

sys_mem_region_map

SYS_MEM_REGION_MAP (106): map an exported region into the caller.

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.

vma_flags_to_prot 🔒

Convert VmaFlags into ABI protection bits.