KOS() {
/* Semaphores */
writeOK = make_kt_sem(0);
writers = make_kt_sem(1);
readers = make_kt_sem(1);
nElem = make_kt_sem(0);
consoleWait = make_kt_sem(0);
/* Generics */
sys_stop_read = 0;
current_pid = 0;
console_size = 256;
buffer_head, buffer_tail;
// Zero out memory
bzero(main_memory, MemorySize);
bzero(memory_space_array, 8);
/* Initializers */
currentProcess = (PCB *) malloc(sizeof(PCB));
initialize_console_buffer(&buffer_head, &buffer_tail);
readyQ = new_dllist();
found_node = make_jrb();
pid_tree = make_jrb();
kt_fork(initialize_user_process, (void *)kos_argv);
kt_fork(console_buf_read, (void *)kos_argv[0]);
kt_joinall();
start_timer(10);
scheduler();
}
//static char *Argv[5] = {"argtest","Rex", "my", "man",NULL};
KOS()
{
//exitSignal = 0;
// printf("Starting kos\n");
bzero(main_memory, MemorySize);
//make a PCB
curProc = (PCB *) malloc(sizeof(PCB));
//make a dllist(readyq) which holds user processes to be run
readyq = new_dllist();
//circular console size, head, and tail
cbSize = 256; //Step 16
cbHead = 0;
cbTail = 0;
//step 14: should be initialized to 1
writers = make_kt_sem(1);
readers = make_kt_sem(1);
writeok = make_kt_sem(0);
//step 17:
consoleWait= make_kt_sem(0);
nelem = make_kt_sem(0);
nslots = make_kt_sem(256);
//printf("Before Forking\n");
//Step 10: pids
curpid = 0;
rbtree = make_jrb();
foundPid = make_jrb(); //has to be its own mini tree
//Lab4
globalFD = 0;
//Step 12: Memory splitting 8
bzero(mem8,8);
//fork to the file with args provided, just loading it
kt_fork(initialize_user_process, kos_argv);
//Step 4: fork to the file with args provided, now reading it, start from the very beginning kos_argv[0]
kt_fork(console_buffer, kos_argv[0]);
//now join all the threads
kt_joinall();
//call the scheduler
// start_timer(10);
//scheduler();
scheduler();
}
KOS() {
writeok = make_kt_sem(0);
writers = make_kt_sem(1);
readers = make_kt_sem(1);
nelem = make_kt_sem(0);
consoleWait = make_kt_sem(0);
sysStopRead = 0;
consoleSize = BUFSIZE;
bzero(main_memory, MemorySize);
current = (PCB *) malloc(sizeof(PCB));
initialize_console_buffer(&consoleBufferHead, &consoleBufferTail);
queue = new_dllist();
kt_fork(initialize_user_process, NULL);
kt_fork(console_buf_read, NULL);
kt_joinall();
scheduler();
}
void
exceptionHandler(ExceptionType which)
{
int type, r5, r6, r7, newPC;
int buf[NumTotalRegs];
examine_registers(buf);
type = buf[4];
r5 = buf[5];
r6 = buf[6];
r7 = buf[7];
newPC = buf[NextPCReg];
/*
* for system calls type is in r4, arg1 is in r5, arg2 is in r6, and
* arg3 is in r7 put result in r2 and don't forget to increment the
* pc before returning!
*/
//set current register to buf.
setReg(current, buf);
switch (which) {
case SyscallException:
/* the numbers for system calls is in <sys/syscall.h> */
switch (type) {
case 0:
/* 0 is our halt system call number */
DEBUG('e', "Halt initiated by user program\n");
SYSHalt();
case SYS_exit:
/* this is the _exit() system call */
DEBUG('e', "SYS Exit\n");
kt_fork(do_exit,current);
break;
case SYS_read:
DEBUG('e', "SYS Read\n");
kt_fork(do_read,current);
break;
case SYS_write:
DEBUG('e', "SYS Write\n");
kt_fork(do_write,current);
break;
case SYS_ioctl:
DEBUG('e',"Sys ioctl\n");
kt_fork(do_ioctl,current);
break;
case SYS_fstat:
DEBUG('e',"Sys fstat\n");
kt_fork(do_fstat,current);
break;
case SYS_getpagesize:
DEBUG('e', "Sys getpagesize\n");
kt_fork(do_getpagesize,current);
break;
case SYS_sbrk:
DEBUG('e',"Sys_sbrk\n");
kt_fork(do_sbrk,current);
break;
case SYS_execve:
DEBUG('e',"Sys execve\n");
kt_fork(do_execve,current);
break;
case SYS_getpid:
DEBUG('e',"SYS_getpid\n");
kt_fork(do_getpid,current);
break;
case SYS_fork:
DEBUG('e', "SYS_fork\n");
kt_fork(do_fork,current);
break;
case SYS_getppid:
DEBUG('e', "SYS_getppid\n");
kt_fork(do_getppid,current);
//SYSHalt();//STUB
break;
case SYS_wait:
DEBUG('e', "SYS_wait\n");
//SYSHalt();//STUB
kt_fork(do_wait,current);
break;
case SYS_getdtablesize:
DEBUG('e', "SYS_getdtablesize\n");
kt_fork(do_getdtablesize,current);
break;
case SYS_close:
DEBUG('e', "SYS_close\n");
kt_fork(do_close,current);
break;
case SYS_pipe:
DEBUG('e', "SYS_pipe\n");
kt_fork(do_pipe,current);
break;
case SYS_dup:
DEBUG('e', "SYS_dup\n");
kt_fork(do_dup,current);
break;
case SYS_dup2:
DEBUG('e', "SYS_dup2\n");
kt_fork(do_dup2,current);
break;
default:
DEBUG('e', "Unknown system call\n");
SYSHalt();
break;
}
break;
case PageFaultException:
DEBUG('e', "Exception PageFaultException\n");
break;
case BusErrorException:
DEBUG('e', "Exception BusErrorException\n");
break;
case AddressErrorException:
DEBUG('e', "Exception AddressErrorException\n");
break;
case OverflowException:
DEBUG('e', "Exception OverflowException\n");
break;
case IllegalInstrException:
DEBUG('e', "Exception IllegalInstrException\n");
break;
default:
printf("Unexpected user mode exception %d %d\n", which, type);
exit(1);
}
scheduler();
}