1 | ; Project name : XTIDE Universal BIOS |
---|
2 | ; Description : Int 13h function AH=Ch, Seek. |
---|
3 | |
---|
4 | ; Section containing code |
---|
5 | SECTION .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 | ;-------------------------------------------------------------------- |
---|
25 | ALIGN JUMP_ALIGN |
---|
26 | AHCh_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 | ;-------------------------------------------------------------------- |
---|
50 | AHCh_SeekToCylinder: |
---|
51 | mov ah, COMMAND_SEEK |
---|
52 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY) |
---|
53 | jmp Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH |
---|