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module Suem (Config(..), ConfigSocket(..), suem) where
import qualified Data.ByteString as B
import Data.Word
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 :: B.ByteString,
rom :: B.ByteString
}
getByte :: Machine -> Int -> Word8
getByte m a | a < 0x8 = B.index (rom m) a
| a < 0x7e0000 = if B.length (ram m) >= a then B.index (ram m) a
else 0xff
| a < 0x800000 = B.index (rom m) (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)
runMachine :: Machine -> IO ()
runMachine _ = do
putStrLn "Machine created."
makeMachine :: B.ByteString -> Int -> Machine
makeMachine romData ramSize = Machine regs ramData romData
where ramData = (B.replicate ramSize 0)
regs = (Registers (getLong m 0x7e0004) 0x2700 (replicate 8 0)
(replicate 7 0) 0 (getLong m 0x7e0000))
m = Machine (Registers 0 0 [] [] 0 0) B.empty romData
suem :: Config -> IO ()
suem (Config _ ramSize romPath _ _ _ _ _ _ _ _) = do
romData <- B.readFile romPath
runMachine (makeMachine romData ramSize)
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