Refactor: Restructure project package hierarchy and add initial implementation for assembler instructions, shell commands, and exception handling.

src/jvmMain/kotlin/mtmc/os/SysCall.kt

@@ -0,0 +1,74 @@
+package mtmc.os
+
+import java.util.*
+
+enum class SysCall(value: Int) {
+  EXIT(0x00),
+  RINT(0x01),
+  WINT(0x02),
+  RSTR(0x03),
+  WCHR(0x04),
+  RCHR(0x05),
+  WSTR(0x06),
+  PRINTF(0x07),
+  ATOI(0x08),
+
+  RFILE(0x10),
+  WFILE(0x11),
+  CWD(0x12),
+  CHDIR(0x13),
+  DIRENT(0x14),
+  DFILE(0x15),
+
+  RND(0x20),
+  SLEEP(0x21),
+  TIMER(0x22),
+
+  FBRESET(0x30),
+  FBSTAT(0x31),
+  FBSET(0x32),
+  FBLINE(0x33),
+  FBRECT(0x34),
+  FBFLUSH(0x35),
+  JOYSTICK(0x3A),
+  SCOLOR(0x3B),
+
+  MEMCPY(0x40),
+
+  DRAWIMG(0x50),
+  DRAWIMGSZ(0x51),
+  DRAWIMGCLIP(0x52),
+
+  ERROR(0xFF);
+
+  val value: Byte
+
+  init {
+    this.value = value.toByte()
+  }
+
+  companion object {
+    fun isSysCall(call: String): Boolean {
+      try {
+        valueOf(call.uppercase(Locale.getDefault()))
+        return true
+      } catch (e: IllegalArgumentException) {
+        return false
+      }
+    }
+
+    @JvmStatic
+    fun getValue(call: String): Byte {
+      return valueOf(call.uppercase(Locale.getDefault())).value
+    }
+
+    fun getString(syscallCode: Byte): String? {
+      for (o in entries) {
+        if (o.value == syscallCode) {
+          return o.name.lowercase(Locale.getDefault())
+        }
+      }
+      return null
+    }
+  }
+}