source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm @ 332

Last change on this file since 332 was 332, checked in by krille_n_@…, 12 years ago

Changes:

  • Fixed a bug in the new BIOS Drive Information Tool.
  • Very small changes to improve speed (I hope).
  • Changed AH48h_GetExtendedDriveParameters.asm to allow AT builds with USE_386 (won't affect any other builds).
  • Verified that most define combinations can be built and changed Strings.asm accordingly. "Most" meaning with or without any combination of EBIOS and/or Serial code defines.
File size: 2.0 KB
Line 
1; Project name  :   XTIDE Universal BIOS
2; Description   :   Int 13h function AH=48h, Get Extended Drive Parameters.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Int 13h function AH=48h, Get Extended Drive Parameters.
9;
10; AH48h_GetExtendedDriveParameters
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 Extended Drive Information Table to fill
18;   Returns with INTPACK:
19;       AH:     Int 13h return status
20;       DS:SI:  Ptr to Extended Drive Information Table
21;       CF:     0 if successful, 1 if error
22;--------------------------------------------------------------------
23AH48h_HandlerForGetExtendedDriveParameters:
24    call    AccessDPT_GetPointerToDRVPARAMStoCSBX
25    push    bx
26    call    AccessDPT_GetLbaSectorCountToBXDXAX
27    pop     di          ; CS:DI now points to DRVPARAMS
28
29    ; Point DS:SI to Extended Drive Information Table to fill
30    mov     ds, [bp+IDEPACK.intpack+INTPACK.ds]
31    mov     cx, MINIMUM_EDRIVEINFO_SIZE
32    cmp     [si+EDRIVE_INFO.wSize], cx
33    jb      Prepare_ReturnFromInt13hWithInvalidFunctionError
34    je      SHORT .SkipEddConfigurationParameters
35
36    ; We do not support EDD Configuration Parameters so set to FFFF:FFFFh
37    mov     cx, -1      ; FFFFh
38    mov     [si+EDRIVE_INFO.fpEDDparams], cx
39    mov     [si+EDRIVE_INFO.fpEDDparams+2], cx
40    mov     cx, EDRIVE_INFO_size
41
42    ; Fill Extended Drive Information Table in DS:SI
43.SkipEddConfigurationParameters:
44    mov     [si+EDRIVE_INFO.wSize], cx
45    mov     WORD [si+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS
46
47    ; Store total sector count
48    mov     [si+EDRIVE_INFO.qwTotalSectors], ax
49    xor     ax, ax                                  ; Return with success
50    mov     [si+EDRIVE_INFO.qwTotalSectors+2], dx
51    mov     [si+EDRIVE_INFO.qwTotalSectors+4], bx
52    mov     [si+EDRIVE_INFO.qwTotalSectors+6], ax   ; Always zero
53    mov     WORD [si+EDRIVE_INFO.wSectorSize], 512
54
55.ReturnWithError:
56    jmp     Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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