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hd_phys_read:
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;eax - sector number
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;ebx - destination
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  pushad
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  call  wait_for_hd_idle
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  popad
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  push  edx
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  push  eax
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  cli
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  xor   eax,eax
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  mov   edx,[hdbase]
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  inc   edx
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  out   dx,al
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  inc   edx
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  inc   eax
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  out   dx,al
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  inc   edx
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;write sector number.
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  mov   eax,[esp]
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  out   dx,al
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  shr   eax,8
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  inc   edx
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  out   dx,al
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  shr   eax,8
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  inc   edx
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  out   dx,al
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  shr   eax,8
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  inc   edx
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  and   al,1+2+4+8
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  add   al,byte [hdid] ;+0 or +16
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  or    al,32+64+128
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  out   dx,al
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  inc   edx
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  mov   al,0x20
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  out   dx,al
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  sti
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  call  wait_for_sector_buffer
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  cmp   [hd_error],0
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  jnz   hd_read_error
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  cli
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  push  edi
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  mov   edi,ebx
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  mov   ecx,256
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  mov   edx,[hdbase]
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  cld
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  rep   insw
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  pop   edi
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  sti
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  pop   edx
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  pop   eax
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  ret
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hd_phys_write:
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;eax - sector number
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;ebx - destination
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  cmp   eax,[partition_start]
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  jb    .ret
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  cmp   eax,[partition_end]
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  ja    .ret
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  pushad
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  call  wait_for_hd_idle
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  popad
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  push  edx
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  push  eax
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  cli
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  xor   eax,eax
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  mov   edx,[hdbase]
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  inc   edx
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  out   dx,al
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  inc   edx
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  inc   eax
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  out   dx,al
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;write sector number
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  inc   edx
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  mov   eax,[esp]
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  out   dx,al
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  shr   eax,8
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  inc   edx
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  out   dx,al
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  shr   eax,8
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  inc   edx
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  out   dx,al
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  shr   eax,8
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  inc   edx
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  and   al,1+2+4+8
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  add   al,byte [hdid] ;+0 or +16
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  or    al,32+64+128
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  out   dx,al
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  inc   edx
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  mov   al,0x30
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  out   dx,al
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  sti
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  call  wait_for_sector_buffer
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  cmp   [hd_error],0
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  jnz   hd_write_error
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  cli
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  push  esi
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  mov   esi,ebx
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  mov   ecx,256
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  mov   edx,[hdbase]
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  cld
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  rep   outsw
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  pop   esi
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  sti
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  pop   edx
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  pop   eax
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.ret:
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  ret