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module Suem (Config(..), ConfigSocket(..), suem) where
import qualified Data.Vector.Unboxed as V
import qualified Data.ByteString as B
import Data.Word
import Data.Bits
data Registers = Registers {
pc :: Word32,
sr :: Word16,
drs :: [Word32], -- d0 to d7
ars :: [Word32], -- a0 to a6
usp :: Word32, -- this is a7 in user mode
ssp :: Word32 -- this is a7 in supermode
}
data Machine = Machine {
regs :: Registers,
ram :: V.Vector Word8,
rom :: V.Vector Word8
}
getByte :: Machine -> Int -> Word8
getByte m a | a < 0x8 = rom m V.! a
| a < 0x7e0000 = if V.length (ram m) >= a then ram m V.! a
else 0xff
| a < 0x800000 = rom m V.! (a - 0x7e0000)
| otherwise = 0xff
getWord :: Machine -> Int -> Word16 -- TODO: only even addresses are allowed
getWord m a = (fromIntegral $ getByte m a) * 256 +
(fromIntegral $ getByte m (a + 1))
getLong :: Machine -> Int -> Word32 -- TODO: only even addresses are allowed
getLong m a = (fromIntegral $ getWord m a) * 256 * 256 +
(fromIntegral $ getWord m (a + 2))
data ConfigSocket = ConfigInet String | ConfigUnix String
data Config = Config Int -- frequence
Int -- size of RAM
FilePath -- path to ROM
(Maybe ConfigSocket)
(Maybe ConfigSocket)
(Maybe ConfigSocket)
(Maybe ConfigSocket)
(Maybe ConfigSocket)
(Maybe ConfigSocket)
(Maybe ConfigSocket)
(Maybe ConfigSocket)
doCommand :: Word16 -> Machine -> Machine
doCommand cmd m = case cmd .&. 0xf000 of
0 -> if testBit cmd 7
then let rega = (shiftR cmd 9) .&. 0x7 in
m
else m
0x1000 -> m
0x2000 -> m
0x3000 -> m
0x4000 -> m
0x5000 -> m
0x6000 -> m
0x7000 -> m
0x8000 -> m
0x9000 -> m
0xb000 -> m
0xc000 -> m
0xd000 -> m
0xe000 -> m
_ -> error "Bad command"
runMachine :: Machine -> IO ()
runMachine m = do
runMachine $ doCommand (getWord m $ fromIntegral $ pc $ regs m) m
makeMachine :: V.Vector Word8 -> Int -> Machine
makeMachine romData ramSize = Machine rs rd romData
where rd = V.replicate ramSize 0
rs = Registers (getLong m 0x7e0004) 0x2700 (replicate 8 0)
(replicate 7 0) 0 (getLong m 0x7e0000)
m = Machine (Registers 0 0 [] [] 0 0) V.empty romData
suem :: Config -> IO ()
suem (Config _ ramSize romPath _ _ _ _ _ _ _ _) = do
romData <- B.readFile romPath
runMachine (makeMachine (V.fromList $ B.unpack $ romData) ramSize)
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