source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AHCh_HSeek.asm@ 229

Last change on this file since 229 was 162, checked in by krille_n_@…, 13 years ago

Changes to all parts of the project:

  • Size optimizations, mostly by excluding code from the BIOS.
  • Cleaned the source a bit, fixed spelling and grammar mistakes.
File size: 1.7 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Int 13h function AH=Ch, Seek.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Int 13h function AH=Ch, Seek.
9;
10; AHCh_HandlerForSeek
11; Parameters:
12; CX, DH: Same as in INTPACK
13; DL: Translated Drive number
14; DS:DI: Ptr to DPT (in RAMVARS segment)
15; SS:BP: Ptr to IDEREGS_AND_INTPACK
16; Parameters on INTPACK:
17; CH: Cylinder number, bits 7...0
18; CL: Bits 7...6: Cylinder number bits 9 and 8
19; Bits 5...0: Starting sector number (1...63)
20; DH: Starting head number (0...255)
21; Returns with INTPACK:
22; AH: BIOS Error code
23; CF: 0 if succesfull, 1 if error
24;--------------------------------------------------------------------
25ALIGN JUMP_ALIGN
26AHCh_HandlerForSeek:
27%ifndef USE_186
28 call AHCh_SeekToCylinder
29 jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
30%else
31 push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
32 ; Fall to AHCh_SeekToCylinder
33%endif
34
35;--------------------------------------------------------------------
36; AHCh_SeekToCylinder
37; Parameters:
38; CH: Cylinder number, bits 7...0
39; CL: Bits 7...6: Cylinder number bits 9 and 8
40; Bits 5...0: Starting sector number (1...63)
41; DH: Starting head number (0...255)
42; DS:DI: Ptr to DPT (in RAMVARS segment)
43; SS:BP: Ptr to IDEREGS_AND_INTPACK
44; Returns:
45; AH: BIOS Error code
46; CF: 0 if succesfull, 1 if error
47; Corrupts registers:
48; AL, BX, CX, DX
49;--------------------------------------------------------------------
50AHCh_SeekToCylinder:
51 mov ah, COMMAND_SEEK
52 mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY)
53 jmp Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
Note: See TracBrowser for help on using the repository browser.