kernel: relocate to HMA if available

kernel/main.asm

@@ -4,55 +4,27 @@ org 0x0000
 
 _startup:
   mov ax, cs
-  mov ds, ax
-  mov es, ax
   mov ss, ax
   mov sp, 0x0000
+  ; <0x0010 is BIOS segment when relocated to HMA
+  ; so we need a nop sled
+  times (0x10 - ($-$$)) nop
 main:
-  xor ax, ax
-  mov ds, ax
-  mov si, ax
-  mov cx, ax
-
-  call debug_init
-  int 0x2E
-
+  call hma_relocate
   call ivt_backup
+  call debug_init
 
-  xor ax, ax
-  mov ds, ax
-  mov es, ax
-  xor cx, cx
-  mov si, ax
-.loop:
-  mov ax, cx
-  call kprint8
-  mov al, '='
-  call kputc
-  lodsw
-  xchg ax, dx
-  lodsw
+  int 0x2E
+  mov ax,0x1234
+  int 0x2E
   call kprint16
-  mov al, ':'
-  call kputc
-  xchg ax, dx
-  call kprint16
-  mov al, ' '
-  call kputc
-  inc cx
-  test cx, 0x0003
-  jnz .loop
-  mov al, 0x0A
-  call kputc
-  mov al, 0x0D
-  call kputc
-  cmp cx, 0x0060
-  jl .loop
 
 .halt:
   hlt
   jmp .halt
 
+%include "hma.asm"
+
 %include "heap.asm"
 %include "intr.asm"
 %include "debug.asm"