source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AHCh_HSeek.asm@ 62

Last change on this file since 62 was 3, checked in by Tomi Tilli, 15 years ago
File size: 1.9 KB
Line 
1; File name : AHCh_HSeek.asm
2; Project name : IDE BIOS
3; Created date : 13.12.2007
4; Last update : 12.4.2010
5; Author : Tomi Tilli
6; Description : Int 13h function AH=Ch, Seek.
7
8; Section containing code
9SECTION .text
10
11;--------------------------------------------------------------------
12; Int 13h function AH=Ch, Seek.
13;
14; AHCh_HandlerForSeek
15; Parameters:
16; AH: Bios function Ch
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; DL: Drive number
22; Parameters loaded by Int13h_Jump:
23; DS: RAMVARS segment
24; Returns:
25; AH: BIOS Error code
26; CF: 0 if succesfull, 1 if error
27; IF: 1
28; Corrupts registers:
29; Flags
30;--------------------------------------------------------------------
31ALIGN JUMP_ALIGN
32AHCh_HandlerForSeek:
33 push dx
34 push cx
35 push bx
36 push ax
37 call AHCh_SeekToCylinder
38 jmp Int13h_PopXRegsAndReturn
39
40
41;--------------------------------------------------------------------
42; Seeks to a cylinder.
43;
44; AHCh_SeekToCylinder
45; Parameters:
46; CH: Cylinder number, bits 7...0
47; CL: Bits 7...6: Cylinder number bits 9 and 8
48; Bits 5...0: Starting sector number (1...63)
49; DH: Starting head number (0...255)
50; DL: Drive Number
51; DS: RAMVARS segment
52; Returns:
53; DS:DI: Ptr to DPT
54; AH: BIOS Error code
55; CF: 0 if succesfull, 1 if error
56; Corrupts registers:
57; AL, BX, CX, DX
58;--------------------------------------------------------------------
59ALIGN JUMP_ALIGN
60AHCh_SeekToCylinder:
61 call FindDPT_ForDriveNumber ; DS:DI now points to DPT
62 mov ax, HCMD_SEEK<<8 ; Load cmd to AH, AL=zero sector cnt
63 call HCommand_OutputCountAndLCHSandCommand
64 jc SHORT .Return ; Return if error
65 mov bx, di ; DS:BX now points to DPT
66 jmp HStatus_WaitIrqOrRdy ; Wait for IRQ or RDY
67.Return:
68 ret
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