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authorAleksey Veresov <aleksey@veresov.pro>2021-02-13 22:58:01 +0300
committerAleksey Veresov <aleksey@veresov.pro>2021-02-13 22:58:01 +0300
commit1ad10fab38c4be9dac68fba9c8249591d883d699 (patch)
tree54eadca77a2f94573e7c6d302890761e564c9405 /src
parentdcbdb1df0cba8e5ff187900f0a9b03e8fd9fe757 (diff)
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Start of deciphering.
Diffstat (limited to 'src')
-rw-r--r--src/Suem.hs52
1 files changed, 38 insertions, 14 deletions
diff --git a/src/Suem.hs b/src/Suem.hs
index 0288d62..0602196 100644
--- a/src/Suem.hs
+++ b/src/Suem.hs
@@ -1,7 +1,9 @@
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 {
@@ -15,15 +17,15 @@ data Registers = Registers {
data Machine = Machine {
regs :: Registers,
- ram :: B.ByteString,
- rom :: B.ByteString
+ ram :: V.Vector Word8,
+ rom :: V.Vector Word8
}
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
+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 = B.index (rom m) (a - 0x7e0000)
+ | a < 0x800000 = rom m V.! (a - 0x7e0000)
| otherwise = 0xff
getWord :: Machine -> Int -> Word16 -- TODO: only even addresses are allowed
@@ -49,18 +51,40 @@ data Config = Config Int -- frequence
(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 _ = do
- putStrLn "Machine created."
+runMachine m = do
+ runMachine $ doCommand (getWord m $ fromIntegral $ pc $ regs m) m
-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
+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 romData ramSize)
+ runMachine (makeMachine (V.fromList $ B.unpack $ romData) ramSize)