int main()
{
pcb_t *init;
int i;
/* Populate the processor state areas into the ROM Reserved Frame */
populateArea(SYSBK_NEWAREA, (memaddr) sysBpHandler); /* SYS/BP Exception Handling */
populateArea(PGMTRAP_NEWAREA, (memaddr) pgmTrapHandler); /* PgmTrap Exception Handling */
populateArea(INT_NEWAREA, (memaddr) intHandler); /* Interrupt Exception Handling */
populateArea(TLB_NEWAREA, (memaddr) tlbHandler); /* TLB Exception Handling */
/* Initialize data structures */
initPcbs();
initASL();
/* Initialize global variables */
ReadyQueue = mkEmptyProcQ();
CurrentProcess = NULL;
ProcessCount = SoftBlockCount = TimerTick = PseudoClock = 0;
/* Initialize device semaphores */
for (i = 0; i < DEV_PER_INT; i++)
Semaphore.disk[i] =
Semaphore.tape[i] =
Semaphore.network[i] =
Semaphore.printer[i] =
Semaphore.terminalR[i] =
Semaphore.terminalT[i] = 0;
/* Initialize init method */
if (!(init = allocPcb()))
PANIC(); /* Anomaly */
/* Enable interrupts; enable Kernel-Mode; disable Virtual Memory */
init->p_s.CP15_Control &= ~(0x1);
init->p_s.cpsr = STATUS_SYS_MODE | STATUS_ALL_INT_ENABLE(init->p_s.cpsr);
/* Initialize Stack Pointer */
init->p_s.sp = RAM_TOP - BUS_REG_RAM_SIZE;
/* Initialize Program Counter with the test process */
init->p_s.pc = (memaddr) test;
/* Insert init in ProcQ */
insertProcQ(&ReadyQueue, init);
/* Initialize Process Id */
ProcessCount++;
/* Start the timer tick */
StartTimerTick = getTODLO();
/* Call the scheduler */
scheduler();
/* Anomaly */
PANIC();
return 0;
}
pcb_t *makeInit() {
// Init the first process
pcb_t *pcb = allocPcb();
pcb->p_pid = 1;
// Processor Status Register
pcb->p_s.cpsr = STATUS_SYS_MODE;
pcb->p_s.cpsr = STATUS_ALL_INT_ENABLE(pcb->p_s.cpsr);
pcb->p_s.cpsr = STATUS_ENABLE_TIMER(pcb->p_s.cpsr);
// System Control Register
pcb->p_s.CP15_Control = CP15_CONTROL_NULL;
// Other registers
pcb->p_s.pc = (memaddr) init;
pcb->p_s.sp = RAM_TOP-FRAMESIZE;
return pcb;
}
void processSet( struct pcb_t *p, memaddr start, int priority){
// Abilita gli interrupt, il Local Timer e la kernel-mode
p->p_s.cpsr = STATUS_ALL_INT_ENABLE(p->p_s.cpsr) | STATUS_SYS_MODE;
// Disabilita la memoria virtuale
p->p_s.CP15_Control = (p->p_s.CP15_Control) & ~(ENABLE_VM);
p->p_s.cpsr = STATUS_ENABLE_TIMER(p->p_s.cpsr);
p->p_s.sp = RAM_TOP - FRAME_SIZE;
// Assegna a PC l'indirizzo della funzione esterna test()
p->p_s.pc = (memaddr) start;
p->priority = priority;
//assegno un pid al processo
p->pid = newpid();
activeProcesses[first->pid-1] = p;
//inserisco il processo dove di competenza
insertProcQ(priority_queue( priority ), p);
}
