void
start(void)
{
int i;
// Set up hardware (schedos-x86.c)
segments_init();
interrupt_controller_init(0);
console_clear();
// Initialize process descriptors as empty
memset(proc_array, 0, sizeof(proc_array));
for (i = 0; i < NPROCS; i++) {
proc_array[i].p_pid = i;
proc_array[i].p_state = P_EMPTY;
}
// Set up process descriptors (the proc_array[])
queue_t frontground = initQueue();
queue_t background = initQueue();
for (i = 1; i < NPROCS; i++) {
process_t *proc = &proc_array[i];
uint32_t stack_ptr = PROC1_START + i * PROC_SIZE;
// Initialize the process descriptor
special_registers_init(proc);
// Set ESP
proc->p_registers.reg_esp = stack_ptr;
// Load process and set EIP, based on ELF image
program_loader(i - 1, &proc->p_registers.reg_eip);
// Mark the process as runnable!
proc->p_state = P_RUNNABLE;
}
// Initialize the cursor-position shared variable to point to the
// console's first character (the upper left).
cursorpos = (uint16_t *) 0xB8000;
// Initialize the scheduling algorithm.
// USE THE FOLLOWING VALUES:
// 0 = the initial algorithm
// 2 = strict priority scheduling (exercise 2)
// 41 = p_priority algorithm (exercise 4.a)
// 42 = p_share algorithm (exercise 4.b)
// 7 = any algorithm that you may implement for exercise 7
scheduling_algorithm = 7;
// Switch to the first process.
run(&proc_array[1]);
// Should never get here!
while (1)
/* do nothing */;
}
void
start(void)
{
int i;
// Set up hardware (schedos-x86.c)
segments_init();
interrupt_controller_init(1);
console_clear();
// Initialize process descriptors as empty
memset(proc_array, 0, sizeof(proc_array));
for (i = 0; i < NPROCS; i++) {
proc_array[i].p_pid = i;
proc_array[i].p_state = P_EMPTY;
}
// Set up process descriptors (the proc_array[])
for (i = 1; i < NPROCS; i++) {
process_t *proc = &proc_array[i];
uint32_t stack_ptr = PROC1_START + i * PROC_SIZE;
// Initialize proportional scheduling vars
proc->p_share = 1;
proc->p_run_t = 0;
// Initialize the process descriptor
special_registers_init(proc);
// Set ESP
proc->p_registers.reg_esp = stack_ptr;
// Load process and set EIP, based on ELF image
program_loader(i - 1, &proc->p_registers.reg_eip);
// Mark the process as runnable!
proc->p_state = P_RUNNABLE;
}
// Initialize the cursor-position shared variable to point to the
// console's first character (the upper left).
cursorpos = (uint16_t *) 0xB8000;
// Initialize the scheduling algorithm.
scheduling_algorithm = 0;
// Switch to the first process.
run(&proc_array[1]);
// Should never get here!
while (1)
/* do nothing */;
}
void
start(void)
{
const char *s;
int whichprocess;
pid_t i;
// Initialize process descriptors as empty
memset(proc_array, 0, sizeof(proc_array));
for (i = 0; i < NPROCS; i++) {
proc_array[i].p_pid = i;
proc_array[i].p_state = P_EMPTY;
}
// The first process has process ID 1.
current = &proc_array[1];
// Set up x86 hardware, and initialize the first process's
// special registers. This only needs to be done once, at boot time.
// All other processes' special registers can be copied from the
// first process.
segments_init();
special_registers_init(current);
// Erase the console, and initialize the cursor-position shared
// variable to point to its upper left.
console_clear();
// Figure out which program to run.
cursorpos = console_printf(cursorpos, 0x0700, "Type '1' to run mpos-app, or '2' to run mpos-app2.");
do {
whichprocess = console_read_digit();
} while (whichprocess != 1 && whichprocess != 2);
console_clear();
// Load the process application code and data into memory.
// Store its entry point into the first process's EIP
// (instruction pointer).
program_loader(whichprocess - 1, ¤t->p_registers.reg_eip);
// Set the main process's stack pointer, ESP.
current->p_registers.reg_esp = PROC1_STACK_ADDR + PROC_STACK_SIZE;
// Mark the process as runnable!
current->p_state = P_RUNNABLE;
// Switch to the main process using run().
run(current);
}