source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH1h_HStatus.asm @ 35

; File name     :   AH1h_HStatus.asm
; Project name  :   IDE BIOS
; Created date  :   27.9.2007
; Last update   :   24.8.2010
; Author        :   Tomi Tilli
; Description   :   Int 13h function AH=1h, Read Disk Status.

; Section containing code
SECTION .text

;--------------------------------------------------------------------
; Int 13h function AH=1h, Read Disk Status.
;
; AH1h_HandlerForReadDiskStatus
;   Parameters:
;       AH:     Bios function 1h
;       DL:     Drive number (8xh)
;   Parameters loaded by Int13h_Jump:
;       DS:     RAMVARS segment
;   Returns:
;       AH:     Int 13h floppy return status
;       CF:     0 if AH = RET_HD_SUCCESS, 1 otherwise (error)
;       IF:     1
;   Corrupts registers:
;       Flags
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
AH1h_HandlerForReadDiskStatus:
    push    ds

    LOAD_BDA_SEGMENT_TO ds, di
    xor     ah, ah                  ; Zero AH
    cmp     ah, [BDA.bHDLastSt]     ; Set CF if error code is non-zero
    mov     ah, [BDA.bHDLastSt]     ; Last error to AH

    pop     ds
    jmp     Int13h_PopDiDsAndReturn