source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH2h_HRead.asm@ 151

; Project name  :   XTIDE Universal BIOS
; Description   :   Int 13h function AH=2h, Read Disk Sectors.

; Section containing code
SECTION .text

;--------------------------------------------------------------------
; Int 13h function AH=2h, Read Disk Sectors.
;
; AH2h_HandlerForReadDiskSectors
;   Parameters:
;       AL, CX, DH, ES: Same as in INTPACK
;       DL:     Translated Drive number
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;       SS:BP:  Ptr to IDEPACK
;   Parameters on INTPACK:
;       AL:     Number of sectors to read (1...255, 0=256)
;       CH:     Cylinder number, bits 7...0
;       CL:     Bits 7...6: Cylinder number bits 9 and 8
;               Bits 5...0: Starting sector number (1...63)
;       DH:     Starting head number (0...255)
;       ES:BX:  Pointer to buffer recieving data
;   Returns with INTPACK:
;       AH:     Int 13h/40h floppy return status
;       AL:     Burst error length if AH returns 11h, undefined otherwise
;       CF:     0 if successfull, 1 if error
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
AH2h_HandlerForReadDiskSectors:
    mov     ah, COMMAND_READ_SECTORS    ; Load sector mode command
    test    WORD [di+DPT.wFlags], FLG_DPT_BLOCK_MODE_SUPPORTED
    eCMOVNZ ah, COMMAND_READ_MULTIPLE   ; Load block mode command
    mov     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
    mov     si, [bp+IDEPACK.intpack+INTPACK.bx]
%ifdef USE_186
    push    Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
    jmp     Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
%else
    call    Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
    jmp     Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
%endif