void
startup()
{
USLOSS_Console("startup\n");
USLOSS_IntVec[USLOSS_CLOCK_INT] = dummy;
USLOSS_Console("1 psr = %d\n", USLOSS_PsrGet());
USLOSS_PsrSet(USLOSS_PsrGet() | USLOSS_PSR_CURRENT_INT);
USLOSS_Console("2 psr = %d\n", USLOSS_PsrGet());
USLOSS_PsrSet(USLOSS_PsrGet() & ~USLOSS_PSR_CURRENT_INT);
USLOSS_Console("3 psr = %d\n", USLOSS_PsrGet());
USLOSS_PsrSet((USLOSS_PsrGet() & ~USLOSS_PSR_CURRENT_MODE) | USLOSS_PSR_CURRENT_INT);
USLOSS_Console("4 psr = %d\n", USLOSS_PsrGet());
USLOSS_Console("This will cause a trap.\n");
USLOSS_PsrSet(3);
}
/* ------------------------------------------------------------------------
Name - launch
Purpose - Dummy function to enable interrupts and launch a given process
upon startup.
Parameters - none
Returns - nothing
Side Effects - enable interrupts
------------------------------------------------------------------------ */
void launch(void){
Check_Your_Privilege();
int rc;
USLOSS_PsrSet(USLOSS_PsrGet() | USLOSS_PSR_CURRENT_INT);
rc = procTable[currPid].startFunc(procTable[currPid].startArg);
// USLOSS_Console("Laung Ending for %s\n",procTable[currPid].name);
/* quit if we ever come back */
P1_Quit(rc);
} /* End of launch */
/*
* Disables the interrupts.
*/
static void disableInterrupts()
{
/* turn the interrupts OFF iff we are in kernel mode */
if( (USLOSS_PSR_CURRENT_MODE & USLOSS_PsrGet()) == 0 ) {
//not in kernel mode
USLOSS_Console("Kernel Error: Not in kernel mode, may not ");
USLOSS_Console("disable interrupts\n");
USLOSS_Halt(1);
} else
/* We ARE in kernel mode */
USLOSS_PsrSet( USLOSS_PsrGet() & ~USLOSS_PSR_CURRENT_INT );
} /* disableInterrupts */
/*
* Enables the interrupts
*/
static void enableInterrupts(int dev, void *args)
{
/* turn the interrupts ON iff we are in kernel mode */
if ( (USLOSS_PSR_CURRENT_MODE & USLOSS_PsrGet()) == 0 ) {
//not in kernel mode
USLOSS_Console("Kernel Error: Not in kernel mode, may not ");
USLOSS_Console("disable interrupts\n");
USLOSS_Halt(1);
} else {
/* We ARE in kernel mode */
USLOSS_PsrSet( USLOSS_PsrGet() | USLOSS_PSR_CURRENT_INT);
}
}
void
startup()
{
int status;
int i, j, k;
FILE *f;
char name[50];
int n;
// Compute the inputs and write them to the term*.in file. Each terminal reads unique content.
k = 0;
for(i = 0; i < USLOSS_TERM_UNITS; i++) {
memset(buffers[i], '\0', NUMCHARS);
counts[i] = 0;
snprintf(name, sizeof(name), "term%d.in", i);
f = fopen(name, "w");
assert(f != NULL);
for (j = 0; j < NUMCHARS; j++) {
inputs[i][j] = 'a' + k++;
}
n = fwrite(inputs[i], 1, NUMCHARS, f);
assert(n == NUMCHARS);
fclose(f);
}
for (i = 0; i < USLOSS_NUM_INTS; i++) {
USLOSS_IntVec[i] = dummy_handler;
}
// Turn on receive interrupts.
for(i = 0; i < USLOSS_TERM_UNITS; i++) {
status = USLOSS_DeviceOutput(USLOSS_TERM_DEV, i, (void *) USLOSS_TERM_CTRL_RECV_INT(0));
}
USLOSS_IntVec[USLOSS_TERM_INT] = term_handler;
// Turn on interrupts.
USLOSS_PsrSet(USLOSS_PsrGet() | USLOSS_PSR_CURRENT_INT);
// Read from the terminals.
while(done < USLOSS_TERM_UNITS ) {
USLOSS_WaitInt();
}
USLOSS_Halt(0);
}
static void syscallHandler(int dev, void *args) {
// get args
systemArgs *sysPtr = (systemArgs *) args;
// check if valid dev
if (dev != USLOSS_SYSCALL_INT) {
USLOSS_Console("syscallHandler(): Bad call\n");
USLOSS_Halt(1);
}
// check if valid range of args
if (sysPtr->number < 0 || sysPtr->number >= MAXSYSCALLS) {
USLOSS_Console("syscallHandler(): sys number %d is wrong. Halting...\n", sysPtr->number);
USLOSS_Halt(1);
}
USLOSS_PsrSet( USLOSS_PsrGet() | USLOSS_PSR_CURRENT_INT);
sys_vec[sysPtr->number](sysPtr);
}
void
startup()
{
int status;
int i;
for (i = 0; i < USLOSS_NUM_INTS; i++) {
USLOSS_IntVec[i] = dummy_handler;
}
// Turn on receive interrupts for terminal 0.
status = USLOSS_DeviceOutput(USLOSS_TERM_DEV, 0, (void *) USLOSS_TERM_CTRL_RECV_INT(0));
USLOSS_IntVec[USLOSS_TERM_INT] = term_handler;
// Turn on interrupts.
USLOSS_PsrSet(USLOSS_PsrGet() | USLOSS_PSR_CURRENT_INT);
// Wait in an infinite loops for interrupts.
while(1) {
USLOSS_WaitInt();
}
}
static void userMode(void) {
USLOSS_PsrSet(USLOSS_PsrGet() & ~(USLOSS_PSR_CURRENT_MODE));
}
static void interruptsOn(void) {
USLOSS_PsrSet(USLOSS_PsrGet() | USLOSS_PSR_CURRENT_INT);
}
void int_enable(){
USLOSS_PsrSet(USLOSS_PsrGet() | USLOSS_PSR_CURRENT_INT);
}
void int_disable(){
USLOSS_PsrSet(USLOSS_PsrGet() & ~(USLOSS_PSR_CURRENT_INT));
}
