first commit

2026-01-19 17:35:37 +01:00
commit 57814ce683
7 changed files with 646 additions and 0 deletions
--- a/include/mmap.inc
+++ b/include/mmap.inc
@@ -0,0 +1,45 @@
+; -----------------------------------------------------------------------------
+; Memory Management Definitions
+; Constants derived from <sys/mman.h> and Linux Kernel documentation.
+; -----------------------------------------------------------------------------
+
+; Memory Protection Flags
+PROT_NONE           equ 0x0         ; Page cannot be accessed
+PROT_READ           equ 0x1         ; Page can be read
+PROT_WRITE          equ 0x2         ; Page can be written
+PROT_EXEC           equ 0x4         ; Page can be executed (Code)
+
+; --- MMAP Flags (x86-64 Linux) ---
+
+; Sharing types (Choose one)
+MAP_SHARED          equ 0x01        ; Share changes
+MAP_PRIVATE         equ 0x02        ; Private copy-on-write
+MAP_SHARED_VALIDATE equ 0x03        ; Validate flags
+
+; Basic flags
+MAP_FIXED           equ 0x10        ; Interpret addr exactly
+MAP_ANONYMOUS       equ 0x20        ; No file backing (RAM only)
+MAP_ANON            equ 0x20        ; Alias for MAP_ANONYMOUS
+MAP_32BIT           equ 0x40        ; Allocate in first 2GB (x86-64 only)
+
+; Advanced flags
+MAP_GROWSDOWN       equ 0x0100      ; Stack-like segment
+MAP_DENYWRITE       equ 0x0800      ; Ignored by modern kernels
+MAP_EXECUTABLE      equ 0x1000      ; Ignored by modern kernels
+MAP_LOCKED          equ 0x2000      ; Lock pages in memory
+MAP_NORESERVE       equ 0x4000      ; Don't reserve swap space
+MAP_POPULATE        equ 0x8000      ; Pre-fault read ahead
+MAP_NONBLOCK        equ 0x10000     ; Do not block on IO
+MAP_STACK           equ 0x20000     ; Allocation is a stack
+MAP_HUGETLB         equ 0x40000     ; Create a huge page
+MAP_SYNC            equ 0x80000     ; Perform synchronous page faults
+MAP_FIXED_NOREPLACE equ 0x100000    ; MAP_FIXED but don't clobber
+
+; Huge Page Sizes (Use with MAP_HUGETLB)
+; Derived from (log2(size) << 26)
+MAP_HUGE_2MB        equ 21 << 26    ; 2MB Huge Page
+MAP_HUGE_1GB        equ 30 << 26    ; 1GB Huge Page
+
+; Legacy / Unused
+MAP_FILE            equ 0
+MAP_UNINITIALIZED   equ 0           ; Usually not implemented