Drop MCBs as mean to manage memory

kernel/mcb.asm

@@ -1,70 +0,0 @@
-	; First MCB block is always at 00540
-mcb_first:
-	mov ax, 0x54
-	mov ds, ax
-	ret
-
-mcb_init:
-	call mcb_first
-	mov dx, ds
-	inc dx
-	xor si, si
-	int 0x12
-	mov cl, 6
-	shl ax, cl
-	sub ax, dx
-	mov byte [si+0], 'Z'
-	mov word [si+1], 0
-	mov word [si+3], ax
-	mov dx, cs
-	call mcb_split
-	mov word [si+1], 8
-	ret
-
-	; split mcb block into two
-	; IN	dx	segment of second block
-mcb_split:
-	call mcb_find
-	dec dx
-	push dx
-	; Calculate size of first block
-	; dx = dx - ds - 1
-	stc
-	mov ax, ds
-	sbb dx, ax
-	;
-	push dx
-	; swap old size with new size
-	xchg dx, [si+3]
-	; if current mcb is last, its not anymore
-	mov cl, 'M'
-	xchg cl, byte [si+0]
-	; advance DS to begin of first block
-	pop ax
-	stc
-	sbb dx, ax
-	pop ax
-	mov ds, ax
-	; write MCB data
-	mov byte [si+0], cl
-	mov word [si+1], 0
-	mov word [si+3], dx
-	ret
-
-	; IN	dx	segment we look for
-	; OUT	ds	segment where mcb starts
-mcb_find:
-	call mcb_first
-	xor si, si
-.loop:	stc
-	adc ax, [si+3]
-	cmp dx, ax
-	jc .found
-	cmp byte [si+0], 'Z'
-	jz .fail
-	mov ds, ax
-	jmp .loop
-.fail:	stc
-	ret
-.found:	clc
-	ret