source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH1h_HStatus.asm@ 277

Last change on this file since 277 was 258, checked in by gregli@…, 12 years ago

Added floppy drive emulation over the serial connection (MODULE_SERIAL_FLOPPY). Along the way, various optimizations were made to stay within the 8K ROM size target. Also, serial code now returns the number of sectors transferred.

File size: 1.1 KB
RevLine 
[116]1; Project name : XTIDE Universal BIOS
[3]2; Description : Int 13h function AH=1h, Read Disk Status.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Int 13h function AH=1h, Read Disk Status.
9;
10; AH1h_HandlerForReadDiskStatus
11; Parameters:
[148]12; DL: Translated Drive number
13; DS:DI: Ptr to DPT (in RAMVARS segment)
[150]14; SS:BP: Ptr to IDEREGS_AND_INTPACK
15; Returns with INTPACK:
[3]16; AH: Int 13h floppy return status
17; CF: 0 if AH = RET_HD_SUCCESS, 1 otherwise (error)
18;--------------------------------------------------------------------
19ALIGN JUMP_ALIGN
20AH1h_HandlerForReadDiskStatus:
[148]21 LOAD_BDA_SEGMENT_TO ds, ax, !
[258]22
23%ifdef MODULE_SERIAL_FLOPPY
24 test dl, dl
25 jns .HardDisk
26 mov ah, [BDA.bFDRetST] ; Unlike for hard disks below, floppy version does not clear the status
27 jmp .done
28.HardDisk:
29%endif
30
[148]31 xchg ah, [BDA.bHDLastSt] ; Load and clear last error
[258]32 ; Note that AH is cleared with the LOAD_BDA_SEGMENT above
33
34.done:
[150]35 call Int13h_SetErrorCodeToIntpackInSSBPfromAH
[148]36 jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode
Note: See TracBrowser for help on using the repository browser.