1 files changed, 119 insertions, 0 deletions
diff --git a/src/devices/system_device.rs b/src/devices/system_device.rs
new file mode 100644
index 0000000..097c616
--- /dev/null
+++ b/src/devices/system_device.rs
@@ -0,0 +1,119 @@
+use crate::*;
+
+
+pub struct SystemDevice {
+    /// Name and version of this system.
+    pub name: StringBuffer,
+    /// Authors of this system.
+    pub authors: StringBuffer,
+    /// Mask of all devices permitted to wake from sleep.
+    pub wake_mask: u16,
+    /// Slot number of device that most recently woke the system.
+    pub wake_slot: u8,
+    /// True if the system has been put to sleep.
+    pub asleep: bool,
+    /// Mask of all connected devices.
+    pub connected_devices: u16,
+    /// Name of the first custom device.
+    pub custom1: StringBuffer,
+    /// Name of the second custom device.
+    pub custom2: StringBuffer,
+    /// Name of the third custom device.
+    pub custom3: StringBuffer,
+    /// Name of the fourth custom device.
+    pub custom4: StringBuffer,
+}
+
+
+impl Device for SystemDevice {
+    fn read(&mut self, port: u8) -> u8 {
+        match port {
+            0x0 => 0x00,
+            0x1 => 0x00,
+            0x2 => self.wake_slot,
+            0x3 => 0x00,
+            0x4 => self.custom1.read(),
+            0x5 => self.custom2.read(),
+            0x6 => self.custom3.read(),
+            0x7 => self.custom4.read(),
+            0x8 => self.name.read(),
+            0x9 => self.authors.read(),
+            0xA => 0x00,
+            0xB => 0x00,
+            0xC => 0x00,
+            0xD => 0x00,
+            0xE => read_h!(self.connected_devices),
+            0xF => read_l!(self.connected_devices),
+            _ => unreachable!(),
+        }
+    }
+
+    fn write(&mut self, port: u8, value: u8) -> Option<Signal> {
+        match port {
+            0x0 => write_h!(self.wake_mask, value),
+            0x1 => {
+                write_l!(self.wake_mask, value);
+                self.asleep = true;
+                return Some(Signal::Sleep);
+            }
+            0x2 =>  (),
+            0x3 => match value {
+                0 => return Some(Signal::Reset),
+                _ => return Some(Signal::Fork),
+            }
+            0x4 => self.custom1.restart(),
+            0x5 => self.custom2.restart(),
+            0x6 => self.custom3.restart(),
+            0x7 => self.custom4.restart(),
+            0x8 => self.name.restart(),
+            0x9 => self.authors.restart(),
+            0xA => (),
+            0xB => (),
+            0xC => (),
+            0xD => (),
+            0xE => (),
+            0xF => (),
+            _ => unreachable!(),
+        };
+        return None;
+    }
+
+    fn wake(&mut self) -> bool {
+        true
+    }
+
+    fn reset(&mut self) {
+        self.wake_mask = 0;
+        self.wake_slot = 0;
+        self.custom1.restart();
+        self.custom2.restart();
+        self.custom3.restart();
+        self.custom4.restart();
+        self.name.restart();
+        self.authors.restart();
+    }
+}
+
+
+impl SystemDevice {
+    pub fn new(connected_devices: u16) -> Self {
+        let pkg_name = env!("CARGO_PKG_NAME");
+        let pkg_version = env!("CARGO_PKG_VERSION");
+        let pkg_authors = env!("CARGO_PKG_AUTHORS");
+        let name = format!("{pkg_name}/{pkg_version}");
+        let authors = pkg_authors.replace(':', "\n");
+
+        Self {
+            name: StringBuffer::from_str(&name),
+            authors: StringBuffer::from_str(&authors),
+            wake_mask: 0,
+            wake_slot: 0,
+            asleep: false,
+            connected_devices,
+            custom1: StringBuffer::new(),
+            custom2: StringBuffer::new(),
+            custom3: StringBuffer::new(),
+            custom4: StringBuffer::new(),
+        }
+    }
+}