source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH42h_ExtendedReadSectors.asm @ 249

Last change on this file since 249 was 249, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • Number of successfully transferred sectors is now returned by all transfer functions (instead of requested sector count).
  • Added INT 19h handler for proper reboot.
File size: 1.8 KB
Line 
1; Project name  :   XTIDE Universal BIOS
2; Description   :   Int 13h function AH=42h, Extended Read Sectors.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Int 13h function AH=42h, Extended Read Sectors.
9;
10; AH42h_HandlerForExtendedReadSectors
11;   Parameters:
12;       SI:     Same as in INTPACK
13;       DL:     Translated Drive number
14;       DS:DI:  Ptr to DPT (in RAMVARS segment)
15;       SS:BP:  Ptr to IDEPACK
16;   Parameters on INTPACK:
17;       DS:SI:  Ptr to Disk Address Packet
18;   Returns with INTPACK:
19;       AH:     Int 13h return status
20;       CF:     0 if succesfull, 1 if error
21;   Return with Disk Address Packet in INTPACK:
22;       .wSectorCount   Number of sectors read successfully
23;--------------------------------------------------------------------
24ALIGN JUMP_ALIGN
25AH42h_HandlerForExtendedReadSectors:
26    call    Prepare_ByLoadingDapToESSIandVerifyingForTransfer
27    mov     ah, [cs:bx+g_rgbReadCommandLookup]
28    mov     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
29    call    Idepack_ConvertDapToIdepackAndIssueCommandFromAH
30    ; Fall to AH42h_ReturnFromInt13hAfterStoringErrorCodeFromAHandTransferredSectorsFromCX
31
32
33;--------------------------------------------------------------------
34; AH42h_ReturnFromInt13hAfterStoringErrorCodeFromAHandTransferredSectorsFromCX
35;   Parameters:
36;       AH:     INT 13h Error Code
37;       CX:     Number of successfully transferred sectors
38;       SS:BP:  Ptr to IDEPACK
39;   Returns:
40;       Nothing, jumps to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
41;   Corrupts registers:
42;       SI, DS
43;--------------------------------------------------------------------
44AH42h_ReturnFromInt13hAfterStoringErrorCodeFromAHandTransferredSectorsFromCX:
45    mov     ds, [bp+IDEPACK.intpack+INTPACK.ds]
46    mov     si, [bp+IDEPACK.intpack+INTPACK.si]
47    mov     [si+DAP.wSectorCount], cx
48    jmp     Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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