Last change
on this file since 258 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
|
Rev | Line | |
---|
[116] | 1 | ; Project name : XTIDE Universal BIOS |
---|
[3] | 2 | ; Description : Int 13h function AH=1h, Read Disk Status. |
---|
| 3 | |
---|
| 4 | ; Section containing code |
---|
| 5 | SECTION .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 | ;-------------------------------------------------------------------- |
---|
| 19 | ALIGN JUMP_ALIGN |
---|
| 20 | AH1h_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.