early allocator prototypes

include/util/arena_alloc.nasm

@@ -0,0 +1,66 @@
+%ifndef __INC_ARENA_ALLOC_FUNC
+
+%define __ARENA_HEAP_START 0x8000
+%define __ARENA_HEAP_SIZE  0x6000   ; 0x8000 -> 0xE000 = 24KiB of Heap
+
+struc ArenaStateStruc_t
+    .start resw 1
+    .end resw 1
+    .mark resw 1
+endstruc
+
+; void arena_init(void *mem, size_t bytes)
+;
+arena_init:
+    __CDECL16_ENTRY
+.func:
+
+.endp:
+    __CDECL16_EXIT
+    ret
+
+; size_t align_up(size_t x, size_t a)
+arena_align_up:
+    __CDECL16_ENTRY
+.func:
+    ; align the mark to the nearest specified alignment
+.endp:
+    __CDECL16_EXIT
+    ret
+
+; void* arena_alloc(void* a, size_t bytes, size_t align)
+arena_alloc:
+    __CDECL16_ENTRY
+.func:
+    ; remove bytes from pool and increment mark to the new cursor location
+    ; return a pointer to the begining of  allocated segment
+.endp:
+    __CDECL16_EXIT
+    ret
+
+arena_mark:
+    __CDECL16_ENTRY
+.func:
+    ; return the current location of the 'cursor' in the allocator
+.endp:
+    __CDECL16_EXIT
+    ret
+
+arena_reset_to:
+    __CDECL16_ENTRY
+.func:
+    ; rewind the arena to a previously marked point
+.endp:
+    __CDECL16_EXIT
+    ret
+
+arena_reset:
+    __CDECL16_ENTRY
+.func:
+    ; reset the entire heap to a fresh state
+.endp:
+    __CDECL16_EXIT
+    ret
+
+%endif
+%define __INC_ARENA_ALLOC_FUNC