void PrintDriver(){
int i, code;
char *p;
msg_t msg;
msg.recipient = 2;
printing_semaphore = SemGet(0);
outportb(LPT1_BASE+LPT_CONTROL, PC_SLCTIN);
code = inportb(LPT1_BASE+LPT_STATUS);
for(i=0; i<50; i++)IO_DELAY();
outportb(LPT1_BASE+LPT_CONTROL, PC_INIT|PC_SLCTIN|PC_IRQEN);
Sleep(1);
for(;;){
MsgRcv(&msg);
cons_printf("PrintDriver (PID %d) now prints...\n",GetPid());
p = msg.data;
while(*p){
SemWait(printing_semaphore);
outportb(LPT1_BASE+LPT_DATA, *p);
code = inportb(LPT1_BASE+LPT_CONTROL);
outportb(LPT1_BASE+LPT_CONTROL, code|PC_STROBE);
for(i=0; i<50; i++)IO_DELAY();
outportb(LPT1_BASE+LPT_CONTROL, code);
p++;
}
}
}
//*********************************************************************
// This serves as a shell's stdin, the terminal input/keyboard process
//*********************************************************************
//process to test the get_serial_char
void Stdin()
{
msg_t msg;
int term_num, shell_pid;
char ch;
MsgRcv(&msg); // sent from Init() for info below:
term_num = msg.numbers[1];
shell_pid = msg.numbers[2];
printf("....\n");
while(1) // loop of service, servicing shell_pid only actually
{
//MsgRcv(&msg); // request from shell to read terminal keyboard input
//bzero(msg.bytes, NUM_BYTE); // filled with zeroes (nulls)
ch = get_serial_char();
printf("_%c_",ch);
}
}
void ConsumerProc()
{
int i, my_pid;
msg_t my_msg;
my_pid = GetPid();
while(1) //loop forever
{
my_msg.recipient = 0;
MsgRcv(&my_msg);
cons_printf("\n-- Consumer (%d) consuming data %d...\n", my_pid, my_msg.data);
for(i = 0; i < 3333333; i++)
{
IO_DELAY(); //busy loop for 2 seconds
}
}
}
void PrintDriver()
{
int i, code;
char *p;
msg_t temp_msg;
printing_semaphore = SemGet(0); //request semaphore printing_semaphore, limit 0.
// reset printer (check printer power, cable, and paper), it will jitter
outportb(LPT1_BASE+LPT_CONTROL, PC_SLCTIN); // CONTROL reg, SeLeCT INterrupt
code = inportb(LPT1_BASE+LPT_STATUS); // read STATUS
for(i = 0; i < 50; i++) //loop 50 times of IO_DELAY();
{
IO_DELAY();
}
outportb(LPT1_BASE+LPT_CONTROL, PC_INIT|PC_SLCTIN|PC_IRQEN); // IRQ ENable
Sleep(1); //Sleep for a second, needs time resetting
while(1)//forever loop:
{
temp_msg.recipient = running_pid;
MsgRcv(&temp_msg);//receive a message, get if msg to print *******
p = temp_msg.data;
cons_printf("PrintDriver (PID %d) now prints...\n", GetPid()); //a notification msg (match how demo runs)
//set p to point to start of character string in message
while (*p != '\0') //"what p points to" is not null/empty/(char)0,
{
outportb(LPT1_BASE+LPT_DATA, *p); // write char to DATA reg
code = inportb(LPT1_BASE+LPT_CONTROL); // read CONTROL reg
outportb(LPT1_BASE+LPT_CONTROL, code|PC_STROBE); // write CONTROL, STROBE added
for(i = 0; i < 50; i++) //do 50 times of IO_DELAY
{
IO_DELAY();
}
outportb(LPT1_BASE+LPT_CONTROL, code); // send back original CONTROL
SemWait(printing_semaphore);//semaphore-wait on the printing semaphore
p++; //move p to next character to print
}
}
}
//put_serial_char test process
void Stdout()
{
msg_t msg;
int term_num, shell_pid;
int i=0;
MsgRcv(&msg); // msg provided by Init() for this process to know:
term_num = msg.numbers[1]; // need info which terminal structure to use
shell_pid = msg.numbers[2]; // need to know mbox ID of shell servicing
printf("\nStd out ready");
while(1) // service loop, servicing shell_pid only actually
{
//MsgRcv(&msg);
//printf(".");
//if(msg.numbers[3]==ECHO_OFF)
//terminals[term_num].echo_mode=FALSE;
put_serial_char('A'+i); // bytes is str to display
i++;
if(i>24) i=0;
//MsgSnd(shell_pid, &msg); // completion msg, content not important
}
}
// *********************************************************************
// File System, a process to answer queries and return file contents
// via message passing
// *********************************************************************
void FileSystem() {
int SHELL, // the shell that's asking FileSystem for service
result, // the result to be included to return to shell
i, my_pid;
msg_t msg;
// after all the directory entries have been assigned, then fill in the size
// of this "directory". _dir[1] is ".." which must point to parent dir
root_dir[0].size = sizeof( root_dir );
bin_dir[0].size = sizeof( bin_dir );
bin_dir[1].size = root_dir[0].size;
www_dir[0].size = sizeof( www_dir );
www_dir[1].size = root_dir[0].size;
// mark all file descriptors as available, make sure UNUSED in FileSystem.h
for(i=0; i<MAX_FD; i++) fd_array[i].owner = UNUSED;
my_pid = GetPid();
while(1) { // start serving requests for shells
MsgRcv(my_pid, &msg);
SHELL = msg.sender; // shell's pid to return query results
switch( msg.code ) { // depending on what's requested
// CHK_OBJ: Shell wants to "check" obj (name in msg.data),
// and attr of it will be returned via msg in msg.data as well
case CHK_OBJ:
result = ChkObj( msg.data, (attr_t *)msg.data );
break;
// OPEN_OBJ: Shell wants to open obj, an FD will be returned
// in msg.number[0], the ownership (SHELL) will be recorded
case OPEN_OBJ:
result = OpenObj( msg.data, SHELL, &msg.number[0] );
break;
// READ_OBJ: Shell wants content of obj FD (msg.number[0])
// return (msg.data) and # of bytes read (msg.number[1])
case READ_OBJ:
result = ReadObj( msg.number[0], msg.data, SHELL, &msg.number[1] );
break;
// CLOSE_OBJ: Shell wants to close FD (msg.number[0])
// check if the owner of FD is Shell (SHELL)
case CLOSE_OBJ:
result = CloseObj( msg.number[0], SHELL );
break;
default: // unknown code received
result = UNKNOWN;
cons_printf( "FileSystem: Bad code %d in message from PID #%d\n",
msg.code, SHELL );
}
msg.code = result;
MsgSnd( SHELL, &msg );
}
}
void Shell()
{
int term_num, stdin_pid, stdout_pid, print_driver_pid,
file_system_pid;
char login[50], passwd[50], cmd_str[50];
msg_t msg;
MsgRcv(&msg);
msg.sender = msg.nums[0];
term_num = msg.nums[1];
print_driver_pid = msg.nums[2];
file_system_pid = msg.nums[3];
msg.nums[4] = ECHO_ON;
stdin_pid = Spawn(Stdin);
stdout_pid = Spawn(Stdout);
MsgSnd(stdin_pid, &msg);
MsgSnd(stdout_pid, &msg);
TerminalInit(term_num);
while(1){
while(1){
MyStrCpy(msg.bytes, "login : "******"password: "******"Illegal login and password!\n");
MsgSnd(stdout_pid, &msg);
MsgRcv(&msg);
}
while(1){
MyStrCpy(msg.bytes, "\nOS Alpha > ");
MsgSnd(stdout_pid, &msg);
MsgRcv(&msg);
MsgSnd(stdin_pid, &msg);
MsgRcv(&msg);
MyStrCpy(cmd_str, msg.bytes);
if( StrCmpLen(cmd_str, "print", 5) == 1 ){
ShellPrint(cmd_str, print_driver_pid, file_system_pid);
MyStrCpy(msg.bytes, cmd_str);
MsgSnd(stdout_pid, &msg);
MsgRcv(&msg);
}
else if( StrCmp(cmd_str, "bye") == 1){
break;
}
else if( StrCmp(cmd_str, "\n")){
continue;
}
else if(StrCmp(cmd_str, "help")){
ShellHelp(stdout_pid);
}
else if(StrCmp(cmd_str, "who")){
ShellWho(stdout_pid);
}
else if(StrCmpLen(cmd_str, "dir", 3)){
ShellDir(cmd_str, stdout_pid,file_system_pid);
}
else if(StrCmpLen(cmd_str, "type", 4)){
ShellType(cmd_str, stdout_pid, file_system_pid);
}
else {
MyStrCpy(msg.bytes, "Invalid command!\n");
MsgSnd(stdout_pid, &msg);
MsgRcv(&msg);
}
}
}
}
