58 lines
1.2 KiB
Forth
58 lines
1.2 KiB
Forth
# ATA (Hard Disk) Driver
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The code here works (at least under qemu), but is *very*
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dangerous to use. It will allow you to read or write a
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sector to/from a dedicated `ata:Sector` buffer. No checks
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are made to validate the sector number. Using these (esp.
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`ata:write`) is likely to cause data loss.
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# Constants
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~~~
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0x20 'ata:READ const
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0x30 'ata:WRITE const
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0x1F0 'ata:PRIMARY const
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~~~
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# Buffer
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~~~
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'ata:Sector d:create #513 allot
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~~~
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# Common
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~~~
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:ata:clear-bsy (-)
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[ 0x1F7 pio:in-byte 0x80 and n:zero? ] until ;
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:ata:set-sector (n-)
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0xE0 0x1F6 pio:out-byte
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0x00 0x1F1 pio:out-byte
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0x01 0x1F2 pio:out-byte
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dup 0x1F3 pio:out-byte
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dup #8 shift 0x1F4 pio:out-byte
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#16 shift 0x1F5 pio:out-byte ;
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~~~
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# Reading a Sector
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~~~
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:ata:read (an-)
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ata:set-sector
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ata:READ 0x1F7 pio:out-byte
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#10000 [ ] times
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#256 [ ata:PRIMARY pio:in-word [ 0xFF and over store n:inc ] sip #8 shift over store n:inc ] times drop ;
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~~~
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# Writing a Sector
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~~~
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:ata:write (n-)
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ata:set-sector
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ata:WRITE 0x1F7 pio:out-byte
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#10000 [ ] times
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#256 [ fetch-next [ fetch-next #-8 shift ] dip + ata:PRIMARY pio:out-word ] times drop
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0xE7 (cache_flush) 0x1F7 pio:out-byte ata:clear-bsy ;
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~~~
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