retroforth/vm/nga-c-native-x86/x86/ata.retro

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