/**
* Creates a new process structure. This will have one thread created for it,
* but with no information populated.
*/
scheduler_pcb_t *scheduler_new_process(void) {
unsigned int frame = find_free_frame();
set_frame(frame);
frame *= 0x1000;
frame += TCB_START;
// allocate the memory for this structure
uintptr_t phys = vm_allocate_phys();
platform_pm_map(platform_pm_get_kernel_table(), frame, phys, VM_FLAGS_KERNEL);
// allocate the process struct here
scheduler_pcb_t *pcb = (scheduler_pcb_t *) frame;
pcb->process_id = scheduler_new_pid();
// allocate a TCB
scheduler_tcb_t *tcb = scheduler_new_tcb(pcb);
// initialise process struct
pcb->thread = tcb;
// initialise thread struct
return pcb;
}
/**
* Creates a new thread structure. If @process is not NULL, the thread is added
* to the linked list of threads for the given process.
*/
scheduler_tcb_t *scheduler_new_tcb(scheduler_pcb_t *process) {
unsigned int frame = find_free_frame();
set_frame(frame);
frame *= 0x1000;
frame += TCB_START;
// allocate the memory for this structure
uintptr_t phys = vm_allocate_phys();
platform_pm_map(platform_pm_get_kernel_table(), frame, phys, VM_FLAGS_KERNEL);
// allocate a thread struct
scheduler_tcb_t *tcb = (scheduler_tcb_t *) frame;
tcb->thread_id = scheduler_new_tid();
// add it to the linked list of threads
if(process) {
scheduler_tcb_t *thread = process->thread;
while(thread) {
// next thread NULL?
if(!thread->next) {
thread->next = tcb;
break;
}
// check the next thread
thread = thread->next;
}
}
return tcb;
}
void allocate_page(void) {
int framenumb;
vmem->adm.pf_count++;
framenumb = find_free_frame();
// wenn alle Frames schon besetzt -> löschen ein frame
if (framenumb == VOID_IDX) {
framenumb = find_remove_frame();
}
vmem->adm.next_alloc_idx = framenumb;
update_pt(framenumb);
// "Pagefault" note
event.alloc_frame=vmem->adm.next_alloc_idx;
event.g_count=vmem->adm.g_count;
event.pf_count=vmem->adm.pf_count;
event.req_pageno=vmem->adm.req_pageno;
logger(event);
}
