source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH2h_HRead.asm @ 526

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

;
; XTIDE Universal BIOS and Associated Tools
; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.
; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;

; 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...128)
;       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 receiving data
;   Returns with INTPACK:
;       AH:     Int 13h/40h floppy return status
;       AL:     Burst error length if AH returns 11h (we never return error code 11h)
;               Number of sectors actually read (only valid if CF set for someBIOSes)
;       CF:     0 if successful, 1 if error
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
AH2h_HandlerForReadDiskSectors:
    call    Prepare_BufferToESSIforOldInt13hTransfer
    call    Prepare_GetOldInt13hCommandIndexToBX
    mov     ah, [cs:bx+g_rgbReadCommandLookup]
    mov     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
%ifdef USE_186
    push    Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL
    jmp     Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
%else
    call    Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
    jmp     Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL
%endif