int main() {
GDT::init();
Console::init();
IDT::init();
ExceptionHandler::init_dispatcher();
IRQ::init();
InterruptHandler::init_dispatcher();
/* -- EXAMPLE OF AN EXCEPTION HANDLER -- */
class DBZ_Handler : public ExceptionHandler {
public:
virtual void handle_exception(REGS * _regs) {
Console::puts("DIVISION BY ZERO!\n");
for(;;);
}
} dbz_handler;
ExceptionHandler::register_handler(0, &dbz_handler);
/* -- INITIALIZE FRAME POOLS -- */
FramePool kernel_mem_pool(KERNEL_POOL_START_FRAME,
KERNEL_POOL_SIZE,
0);
unsigned long process_mem_pool_info_frame = kernel_mem_pool.get_frame();
FramePool process_mem_pool(PROCESS_POOL_START_FRAME,
PROCESS_POOL_SIZE,
process_mem_pool_info_frame);
process_mem_pool.mark_inaccessible(MEM_HOLE_START_FRAME, MEM_HOLE_SIZE);
/* -- INITIALIZE MEMORY (PAGING) -- */
/* ---- INSTALL PAGE FAULT HANDLER -- */
class PageFault_Handler : public ExceptionHandler {
public:
virtual void handle_exception(REGS * _regs) {
PageTable::handle_fault(_regs);
}
} pagefault_handler;
ExceptionHandler::register_handler(14, &pagefault_handler);
/* ---- INITIALIZE THE PAGE TABLE -- */
PageTable::init_paging(&kernel_mem_pool,
&process_mem_pool,
4 MB);
PageTable pt;
pt.load();
PageTable::enable_paging();
/* -- INITIALIZE THE TIMER (we use a very simple timer).-- */
SimpleTimer timer(100); /* timer ticks every 10ms. */
InterruptHandler::register_handler(0, &timer);
/* NOTE: The timer chip starts periodically firing as
soon as we enable interrupts.
It is important to install a timer handler, as we
would get a lot of uncaptured interrupts otherwise. */
/* -- ENABLE INTERRUPTS -- */
Machine::enable_interrupts();
/* -- MOST OF WHAT WE NEED IS SETUP. THE KERNEL CAN START. */
Console::puts("Hello World!\n");
/* -- GENERATE MEMORY REFERENCES */
int *foo = (int *) FAULT_ADDR;
int i;
for (i=0; i<NACCESS; i++) {
foo[i] = i;
}
for (i=0; i<NACCESS; i++) {
if(foo[i] != i) {
Console::puts("TEST FAILED for access number:");
Console::putui(i);
Console::puts("\n");
break;
}
}
if(i == NACCESS) {
Console::puts("TEST PASSED\n");
}
/* -- NOW LOOP FOREVER */
for(;;);
/* -- WE DO THE FOLLOWING TO KEEP THE COMPILER HAPPY. */
return 1;
}
