//write a 512 byte sector to the current track
int P2_DiskWrite(int unit, int track, int first, int sectors, void *buffer) {
if(permissionCheck() || track < 0 || track >= DISK_TRACKS[unit] || first < 0 ||
first > 15 || unit < 0 || unit > 1 || sectors <= 0){
return -1;
}
P1_P(diskSem[unit]);
int status = 0;
//first make a device request struct for a seek
USLOSS_DeviceRequest seekRequest;
seekRequest.opr = USLOSS_DISK_SEEK;
seekRequest.reg1 = (void *)track; //track number where the r/w head should be moved
//make device request struct for write
USLOSS_DeviceRequest writeRequest;
writeRequest.opr = USLOSS_DISK_WRITE;
USLOSS_DeviceOutput(USLOSS_DISK_DEV,unit,&seekRequest);
P1_WaitDevice(USLOSS_DISK_DEV,unit,&status);
int i = 0;
while (sectors != 0 && status == 0) {
writeRequest.reg1 = (void *)first;
writeRequest.reg2 = buffer + (i * USLOSS_DISK_SECTOR_SIZE);
USLOSS_DeviceOutput(USLOSS_DISK_DEV,unit,&writeRequest);
P1_WaitDevice(USLOSS_DISK_DEV,unit,&status);
if (status == USLOSS_DEV_ERROR) {
USLOSS_Console("Error with disk write request, unit %d, track %d, sector %d\n",unit, track, first);
}
first++;
sectors--;
if (first == 16 && sectors > 0) {
//need to move on to next track.
track++;
seekRequest.reg1 = (void *) track;
USLOSS_DeviceOutput(USLOSS_DISK_DEV,unit,&seekRequest);
P1_WaitDevice(USLOSS_DISK_DEV,unit,&status);
first = 0; //set first to 0 sector of new track
}
writeRequest.reg1 = (void *)first;
i++;
}
P1_V(diskSem[unit]);
return status;
}
int TermDriver(void *arg){
int unit = (int) arg;
termReaderMB[unit] = P2_MboxCreate(1,INT_SIZE);
termLookAhead[unit] = P2_MboxCreate(10,MAX_LINE);
termCharToWrite[unit] = P2_MboxCreate(1,INT_SIZE);
termWriteSem[unit] = P1_SemCreate(1);
termRunningSem[unit] = P1_SemCreate(0);
P1_Fork("Term Reader", TermReader, (void *) unit,USLOSS_MIN_STACK, 2);
P1_P(termRunningSem[unit]);
/*Turn on Terminal interrupts*/
int ctrl = 0;
int ctrl2 = 0;
ctrl = USLOSS_TERM_CTRL_RECV_INT(ctrl);
USLOSS_DeviceOutput(USLOSS_TERM_DEV,unit,(void *)ctrl);
P1_V(running);
int status = 0;
int c = 0;
int result;
while(1){
result = P1_WaitDevice(USLOSS_TERM_DEV,unit,&status);
if(result != 0 || done != 0){
break;
}
if(USLOSS_TERM_STAT_RECV(status) == USLOSS_DEV_BUSY){
P2_MboxSend(termReaderMB[unit],&status,&INT_SIZE);
}
if(USLOSS_TERM_STAT_XMIT(status) == USLOSS_DEV_READY){
if(P2_MboxCondReceive(termCharToWrite[unit],&c,&INT_SIZE) != -2){
ctrl2 = 0;
ctrl2 = USLOSS_TERM_CTRL_XMIT_INT(ctrl2);
ctrl2 = USLOSS_TERM_CTRL_RECV_INT(ctrl2);
ctrl2 = USLOSS_TERM_CTRL_CHAR(ctrl2, c);
ctrl2 = USLOSS_TERM_CTRL_XMIT_CHAR(ctrl2);
USLOSS_DeviceOutput(USLOSS_TERM_DEV, unit, (void *)ctrl2);
}else{
ctrl2 = 0;
ctrl2 = USLOSS_TERM_CTRL_RECV_INT(ctrl2);
USLOSS_DeviceOutput(USLOSS_TERM_DEV, unit, (void *)ctrl2);
}
}
}
status = 0;
P2_MboxCondSend(termReaderMB[unit],&ctrl,&status);
P1_Join(&status);
return unit;
}
/*P2_DiskSize() returns info about the size of the disk indicated by unit*/
int P2_DiskSize(int unit, int *sector, int *track, int *disk) {
if(permissionCheck() || unit < 0 || unit > 1){
return -1;
}
P1_P(diskSem[unit]);
int status;
*sector = USLOSS_DISK_SECTOR_SIZE;
*track = USLOSS_DISK_TRACK_SIZE;
// Make device request for finding number of tracks in disk
USLOSS_DeviceRequest request;
request.opr = USLOSS_DISK_TRACKS;
//reg1 contains pointer to integer where number of disk tracks will be stored
request.reg1 = disk;
USLOSS_DeviceOutput(USLOSS_DISK_DEV,unit,&request);
P1_WaitDevice(USLOSS_DISK_DEV,unit,&status);
P1_V(diskSem[unit]);
return 0;
}
int P2_Startup(void *arg){
USLOSS_Console(" \n---------Starting Test 11 ----------\n");
int status;
int r;
int temp;
int i=0;
while(i<10){
//USLOSS_Console("before: %d\t", temp=USLOSS_Clock());
++i;
temp=USLOSS_Clock();
r=P1_WaitDevice(USLOSS_CLOCK_DEV, 0, &status);
USLOSS_Console("wait period : %d\n", USLOSS_Clock()-temp);
}
USLOSS_Console(" ---------Ending Test 11 ----------\n");
return 0;
}
static int ClockDriver(void *arg) {
interruptsOn();
int result;
int status;
int rc = 0;
/*
* Let the parent know we are running and enable interrupts.
*/
P1_V(running);
while (1) {
result = P1_WaitDevice(USLOSS_CLOCK_DEV, 0, &status);
if (result != 0) {
rc = 1;
goto done;
}
/*
* Compute the current time and wake up any processes
* whose time has come.
*/
wakeUpProcesses();
}
wakeUpProcesses();
done: return rc;
}
