Remove unused hma and heap code

kernel/heap.asm

@@ -1,84 +0,0 @@
-heap_size:
-  ; 1 step here means 1 byte heap alloc table + 16 byte heap data
-  ; 0x0400 = 1kB table, 16kb data
-  dw 0x0400
-
-heap_init:
-  push ax ; byte value (0)
-  push cx ; loop counter
-  push di ; target ptr
-  push es
-  mov ax, cs
-  mov es, ax
-  xor ax, ax
-  mov cx, [heap_size]
-  mov di, heap
-  rep stosb ; rep makes this loop cx times, incrementing di, writing al
-  pop es
-  pop di
-  pop cx
-  pop ax
-  ret
-
-; in	ax	number of bytes to alloc
-; out	ds:di
-malloc:
-  push cx ; number of blocks to allocate
-  push bp ; base offset for block table
-  push es
-
-  ; transfer 12 MSB from ax to cx
-  add ax, 0x000F
-  mov cl, 0x04
-  shr ax, cl
-  mov cx, ax
-
-  mov bp, heap
-  mov di, 0x0000
-  mov ax, ds
-  mov es, ax
-  xor ah, ah ; we use ax for reading from al once
-  jmp .firstblock
-
-.testlength:
-  push cx
-  push di
-  add di, bp ; scasb doesn't add bp on its own
-  repe scasb
-  pop di
-  pop cx
-  je .found
-  ; find next free item
-  mov al, 0x01
-.nextblock:
-  add di, ax
-.firstblock:
-  mov al, [bp+di]
-  cmp al, 0x00
-  jne .nextblock
-  cmp cx, 0x0001 ; fast case: 1 block allocation, skip test if length fits
-  jne .testlength
-.found:
-  mov [bp+di], cl
-  mov cl, 0x04
-  shl di, cl
-  add di, bp
-  add di, [heap_size]
-  pop es
-  pop bp
-  pop cx
-  ret
-
-; in	ds:di	begin of data block to free (di trashed)
-free:
-  push cx
-  push bp
-  mov bp, heap
-  sub di, [heap_size]
-  sub di, bp
-  mov cl, 0x04
-  shr di, cl
-  mov byte [bp+di], 0x00
-  pop bp
-  pop cx
-  ret

kernel/hma.asm

@@ -1,32 +0,0 @@
-; Code related to memory segment from 0xFFFF0 - 0x10FFEF
-
-; Check if 0000:0000 and FFFF:0010 point to the same memory
-; ZF=1 when A20 disabled and HMA unusable
-; ZF=0 when A20 enabled
-a20_enabled:
-  mov ax, 0x0000
-  mov ds, ax
-  mov si, ax
-  mov ax, 0xFFFF
-  mov di, 0x0010
-  mov cx, 0x0200
-  repe cmpsw
-  ret
-
-; Relocate kernel code to HMA
-hma_relocate:
-  call a20_enabled
-  ; TODO: talk to hw to enable a20
-  jz .end
-  mov ax, cs
-  mov ds, ax
-  mov si, 0x0010
-  mov ax, 0xFFFF
-  mov es, ax ; new code segment
-  mov ss, ax ; new stack segment
-  mov di, 0x0010
-  mov cx, 0x7FF8 ; 0xFFF0 divided by 2
-  repe movsw
-  jmp 0xFFFF:.end
-.end:
-  ret