Merge branch 'thread_scheduler' of gitlab.istic.univ-rennes1.fr:simpleos/burritos into thread_scheduler

src/simulator/machine.rs

@@ -23,6 +23,10 @@ use crate::simulator::{
 	register::*
 };
 
+use crate::kernel::{
+	exception
+};
+
 /// # Exceptions
 /// 
 /// Textual names of the exceptions that can be generated by user program
@@ -48,6 +52,16 @@ pub enum ExceptionType {
 	NumExceptionTypes
 }
 
+/// # Machine Status
+/// 
+/// The machine can be running kernel code (SystemMode), user code (UserMode), 
+/// or there can be no running thread if the ready list is empty (IdleMode). 
+pub enum MachineStatus {
+	IdleMode,
+	SystemMode,
+	UserMode
+}
+
 /// ID of the stack register
 pub const STACK_REG: usize = 2;
 /// Number of available Integer registers
@@ -78,9 +92,12 @@ pub struct Machine {
 	/// Debug data
 	pub registers_trace : String, // for tests
 	/// todo: document Interrupts
-	pub interrupt: Interrupt
+	pub interrupt: Interrupt,
 	// futur taille à calculer int memSize = g_cfg->NumPhysPages * g_cfg->PageSize;
 	//creer une struct cfg(configuration) qui s'initialise avec valeur dans un fichier cfg
+	
+	/// Current machine status
+	pub status: MachineStatus
 }
 
 
@@ -105,7 +122,8 @@ impl Machine {
 			main_memory : vec![0_u8; MEM_SIZE],
 			shiftmask,
 			interrupt: Interrupt::new(),
-			registers_trace : String::from("")
+			registers_trace : String::from(""),
+			status: MachineStatus::SystemMode
 		}
 	}
 
@@ -206,6 +224,15 @@ impl Machine {
 		s
 	}
 
+	pub fn raise_exception(&mut self, exception: ExceptionType, address : u64) -> Result<(), MachineError>{
+
+		self.set_status(MachineStatus::SystemMode);
+		// Handle the interruption
+		exception::call(exception, self); // todo: return error if the syscall code is invalid 
+		self.set_status(MachineStatus::UserMode);
+		Ok(())
+	}
+
 	/// Execute the instructions table of a machine putted in param
 	/// 
 	/// ### Parameters
@@ -298,7 +325,7 @@ impl Machine {
 			RISCV_FP =>	self.fp_instruction(inst),
 
 			// Treatment for: SYSTEM CALLS
-			RISCV_SYSTEM => Err(format!("{:x}: System opcode\npc: {:x}", inst.opcode, self.pc))?,
+			RISCV_SYSTEM => self.raise_exception(ExceptionType::SyscallException, self.pc),
 
 			// Default case
 			_ => Err(format!("{:x}: Unknown opcode\npc: {:x}", inst.opcode, self.pc))?
@@ -640,6 +667,14 @@ impl Machine {
 	pub fn write_fp_register(&mut self, index: usize, value: f32) {
 		self.fp_reg.set_reg(index as u8, value);
 	}
+
+	pub fn get_status(&self) -> MachineStatus {
+		todo!()
+	}
+
+	pub fn set_status(&mut self, new_status: MachineStatus) {
+		self.status = new_status;
+	}
 }
 
 #[cfg(test)]