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Last change
on this file since 272 was 258, checked in by gregli@…, 13 years ago |
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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.
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File size:
1.1 KB
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| [150] | 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Sets Serial Device specific parameters to DPT.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; SerialDPT_Finalize
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| 9 | ; Parameters:
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| 10 | ; DS:DI: Ptr to Disk Parameter Table
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| 11 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 12 | ; Returns:
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| [258] | 13 | ; CF: Set, indicates that this is a floppy disk
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| 14 | ; Clear, indicates that this is a hard disk
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| [150] | 15 | ; Corrupts registers:
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| [242] | 16 | ; AX
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| [150] | 17 | ;--------------------------------------------------------------------
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| [179] | 18 | SerialDPT_Finalize:
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| [258] | 19 | mov ax, [es:si+ATA6.wSerialPortAndBaud]
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| [242] | 20 | mov [di+DPT_SERIAL.wSerialPortAndBaud], ax
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| [258] | 21 |
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| 22 | ;
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| 23 | ; Note that this section is not under %ifdef MODULE_SERIAL_FLOPPY. It is important to
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| 24 | ; detect floppy disks presented by the server and not treat them like hard disks, even
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| 25 | ; if the floppy support is disabled.
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| 26 | ;
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| 27 | mov al, [es:si+ATA6.wSerialFloppyFlagAndType]
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| 28 | or al, FLGH_DPT_SERIAL_DEVICE
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| 29 | or byte [di+DPT.bFlagsHigh], al
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| 30 |
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| 31 | test al, FLGH_DPT_SERIAL_FLOPPY ; clears CF
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| 32 | jz .notfloppy
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| 33 | stc
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| 34 | .notfloppy:
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| 35 |
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| [179] | 36 | ret
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| 37 |
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