From 1ad10fab38c4be9dac68fba9c8249591d883d699 Mon Sep 17 00:00:00 2001
From: Aleksey Veresov <aleksey@veresov.pro>
Date: Sat, 13 Feb 2021 22:58:01 +0300
Subject: Start of deciphering.

---
 src/Suem.hs | 52 ++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 38 insertions(+), 14 deletions(-)

(limited to 'src')

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)
-- 
cgit v1.2.3