PR-04 - CAP fixes

crates/prometeu-core/src/model/cartridge.rs

@@ -1,7 +1,14 @@
 use crate::virtual_machine::Program;
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum AppMode {
+    Game,
+    System,
+}
+
 #[derive(Debug, Clone)]
 pub struct AppHeader {
+    pub mode: AppMode,
     pub app_id: String,
     pub magic: u32,
     pub version: u16,

crates/prometeu-core/src/model/mod.rs

@@ -8,7 +8,7 @@ mod sample;
 mod cartridge;
 
 pub use button::Button;
-pub use cartridge::Cartridge;
+pub use cartridge::{AppHeader, AppMode, Cartridge};
 pub use color::Color;
 pub use sample::Sample;
 pub use sprite::Sprite;

crates/prometeu-core/src/prometeu_os/prometeu_os.rs

@@ -9,7 +9,8 @@ use std::sync::Arc;
 pub struct PrometeuOS {
     pub tick_index: u64,
     pub logical_frame_index: u64,
-    pub logical_frame_open: bool,
+    pub logical_frame_active: bool,
+    pub logical_frame_remaining_cycles: u64,
     pub last_frame_cpu_time_us: u64,
 
     // Assets de exemplo (mantidos para compatibilidade com syscalls de áudio v0)
@@ -19,13 +20,15 @@ pub struct PrometeuOS {
 }
 
 impl PrometeuOS {
-    pub const CYCLES_PER_FRAME: u64 = 100_000;
+    pub const CYCLES_PER_LOGICAL_FRAME: u64 = 100_000;
+    pub const SLICE_PER_TICK: u64 = 100_000; // Por enquanto, o mesmo, mas permite granularidade diferente
 
     pub fn new() -> Self {
         let mut os = Self {
             tick_index: 0,
             logical_frame_index: 0,
-            logical_frame_open: false,
+            logical_frame_active: false,
+            logical_frame_remaining_cycles: 0,
             last_frame_cpu_time_us: 0,
             sample_square: None,
             sample_kick: None,
@@ -42,7 +45,8 @@ impl PrometeuOS {
         *vm = VirtualMachine::default();
         self.tick_index = 0;
         self.logical_frame_index = 0;
-        self.logical_frame_open = false;
+        self.logical_frame_active = false;
+        self.logical_frame_remaining_cycles = 0;
         self.last_frame_cpu_time_us = 0;
     }
 
@@ -56,25 +60,34 @@ impl PrometeuOS {
         let start = std::time::Instant::now();
         self.tick_index += 1;
 
-        if !self.logical_frame_open {
-            self.logical_frame_open = true;
+        if !self.logical_frame_active {
+            self.logical_frame_active = true;
+            self.logical_frame_remaining_cycles = Self::CYCLES_PER_LOGICAL_FRAME;
             self.begin_logical_frame(signals, hw);
         }
 
-        // Executa budget
-        let run_result = vm.run_budget(Self::CYCLES_PER_FRAME, self, hw);
+        // Budget para este tick: o mínimo entre a fatia do tick e o que resta no frame lógico
+        let budget = std::cmp::min(Self::SLICE_PER_TICK, self.logical_frame_remaining_cycles);
 
-        match run_result {
-            Ok(run) => {
-                if run.reason == crate::virtual_machine::LogicalFrameEndingReason::FrameSync {
-                    hw.gfx_mut().render_all();
-                    self.end_logical_frame(hw);
-                    self.logical_frame_index += 1;
-                    self.logical_frame_open = false;
+        if budget > 0 {
+            // Executa budget
+            let run_result = vm.run_budget(budget, self, hw);
+
+            match run_result {
+                Ok(run) => {
+                    self.logical_frame_remaining_cycles = self.logical_frame_remaining_cycles.saturating_sub(run.cycles_used);
+
+                    if run.reason == crate::virtual_machine::LogicalFrameEndingReason::FrameSync {
+                        hw.gfx_mut().render_all();
+                        self.end_logical_frame(hw);
+                        self.logical_frame_index += 1;
+                        self.logical_frame_active = false;
+                        self.logical_frame_remaining_cycles = 0;
+                    }
+                }
+                Err(e) => {
+                    return Some(format!("PVM Fault: {:?}", e));
                 }
-            }
-            Err(e) => {
-                return Some(format!("PVM Fault: {:?}", e));
             }
         }
 
@@ -150,6 +163,98 @@ impl PrometeuOS {
     }
 }
 
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::hardware::InputSignals;
+    use crate::model::{AppHeader, AppMode, Cartridge};
+    use crate::virtual_machine::{Program, VirtualMachine};
+    use crate::Hardware;
+
+    #[test]
+    fn test_infinite_loop_budget_reset_bug() {
+        let mut os = PrometeuOS::new();
+        let mut vm = VirtualMachine::default();
+        let mut hw = Hardware::new();
+        let signals = InputSignals::default();
+
+        // JMP 0 (Loop infinito)
+        // OpCode::Jmp = 0x02, seguido por u32 0 (0x00, 0x00, 0x00, 0x00)
+        let rom = vec![0x02, 0x00, 0x00, 0x00, 0x00, 0x00];
+        let program = Program::new(rom, vec![]);
+        let cartridge = Cartridge {
+            header: AppHeader {
+                mode: AppMode::Game,
+                app_id: "test".to_string(),
+                magic: 0,
+                version: 1,
+                title: "test".to_string(),
+                entrypoint: 0,
+            },
+            program,
+        };
+        os.initialize_vm(&mut vm, &cartridge);
+
+        // Primeiro tick
+        os.step_frame(&mut vm, &signals, &mut hw);
+        let cycles_after_tick_1 = vm.cycles;
+        assert!(cycles_after_tick_1 >= PrometeuOS::CYCLES_PER_LOGICAL_FRAME);
+
+        // Segundo tick - Agora ele NÃO deve ganhar mais budget
+        os.step_frame(&mut vm, &signals, &mut hw);
+        let cycles_after_tick_2 = vm.cycles;
+        
+        // CORREÇÃO: Ele não deve ter consumido ciclos no segundo tick porque o budget do frame lógico acabou
+        println!("Cycles after tick 1: {}, tick 2: {}", cycles_after_tick_1, cycles_after_tick_2);
+        assert_eq!(cycles_after_tick_2, cycles_after_tick_1, "VM should NOT have consumed more cycles in the second tick because logical frame budget is exhausted");
+    }
+
+    #[test]
+    fn test_budget_reset_on_frame_sync() {
+        let mut os = PrometeuOS::new();
+        let mut vm = VirtualMachine::default();
+        let mut hw = Hardware::new();
+        let signals = InputSignals::default();
+
+        // Loop que chama FrameSync:
+        // PUSH_CONST 0 (dummy)
+        // FrameSync (0x80)
+        // JMP 0
+        let rom = vec![
+            0x10, 0x00, 0x00, 0x00, 0x00, 0x00, // PUSH const 0 (2 bytes opcode + 4 bytes u32)
+            0x80, 0x00,                         // FrameSync (2 bytes opcode)
+            0x02, 0x00, 0x00, 0x00, 0x00, 0x00, // JMP 0 (2 bytes opcode + 4 bytes u32)
+        ];
+        let program = Program::new(rom, vec![Value::Integer(0)]);
+        let cartridge = Cartridge {
+            header: AppHeader {
+                mode: AppMode::Game,
+                app_id: "test".to_string(),
+                magic: 0,
+                version: 1,
+                title: "test".to_string(),
+                entrypoint: 0,
+            },
+            program,
+        };
+        os.initialize_vm(&mut vm, &cartridge);
+
+        // Primeiro tick
+        os.step_frame(&mut vm, &signals, &mut hw);
+        let cycles_after_tick_1 = vm.cycles;
+        
+        // Deve ter parado no FrameSync
+        assert!(cycles_after_tick_1 > 0, "VM should have consumed some cycles");
+        assert!(cycles_after_tick_1 < PrometeuOS::CYCLES_PER_LOGICAL_FRAME);
+
+        // Segundo tick - Deve resetar o budget e rodar mais um pouco até o próximo FrameSync
+        os.step_frame(&mut vm, &signals, &mut hw);
+        let cycles_after_tick_2 = vm.cycles;
+        
+        assert!(cycles_after_tick_2 > cycles_after_tick_1, "VM should have consumed more cycles because FrameSync reset the budget");
+    }
+}
+
 impl NativeInterface for PrometeuOS {
     fn syscall(&mut self, id: u32, vm: &mut VirtualMachine, hw: &mut dyn HardwareBridge) -> Result<u64, String> {
         match id {

crates/prometeu-core/src/virtual_machine/virtual_machine.rs

@@ -51,6 +51,7 @@ impl VirtualMachine {
         self.call_stack.clear();
         self.globals.clear();
         self.heap.clear();
+        self.cycles = 0;
         self.halted = false;
     }
 }