Elaina Claus
f5e4927d70
Some checks failed
Daily Build and trunk tester / debian_update (push) Failing after 1m14s
84 lines
1.8 KiB
NASM
84 lines
1.8 KiB
NASM
%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(ArenaState *a)
|
|
;
|
|
arena_init:
|
|
__CDECL16_ENTRY
|
|
.func:
|
|
movzx eax, word [bp + 4] ; ptr to state structure
|
|
mov di, ax
|
|
|
|
xor eax, eax
|
|
mov word [di + ArenaStateStruc_t.mark], eax
|
|
mov word [di + ArenaStateStruc_t.end], word (__ARENA_HEAP_START + __ARENA_HEAP_SIZE)
|
|
mov word [di + ArenaStateStruc_t.start], __ARENA_HEAP_START
|
|
|
|
; zero out heap area on init
|
|
; void* kmemset_byte(void* dst, uint8_t val, uint16_t len);
|
|
mov ax, __ARENA_HEAP_SIZE
|
|
push ax ; len
|
|
xor ax, ax
|
|
push ax ; val = 0
|
|
mov ax, __ARENA_HEAP_START
|
|
push ax ; dst
|
|
call kmemset
|
|
add sp, 0x6
|
|
|
|
.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 |