void zero_process_structure(process_t *proc, int new_pid)
{
if (!proc)
return;
proc->name[0] = 0;
if ( new_pid < 0 )
proc->pid = generate_pid();
else
proc->pid = new_pid;
proc->ppid = -1;
proc->page_table_base = NULL;
proc->state = PROCESS_NONE;
memset(&proc->registers, 0, sizeof(proc->registers));
proc->next = NULL;
proc->mm.vma_list = NULL;
proc->kernel_stack = NULL;
proc->currentDirectory = root;
proc->homeDirectory = root;
}
void build_process_address_space(struct PCB* process)
{
uint64_t entry = 0;
uint64_t e_rsp = UXSTACKTOP;
struct page* page_temp;
//struct vma* vma_temp;
//int ab=0;
//Allocate for user pml4 table and initialize it
//Since its in user space, will already be mapped.
if(!process->pml4)
{
page_temp = page_alloc();
if(page_temp->ref_count==1)
printf("PANIC\n");
memset((void *)getVA(page_temp),0,PAGE_SIZE);
process->cr3 = (uint64_t *)getPA(page_temp);
process->pml4 = (uint64_t *)getVA(page_temp);
//Copy 1 entry from kernel_pml4 to this pml4
*(process->pml4 + PML4OFF(KERNBASE)) = *(kernel_pml4 + PML4OFF(KERNBASE));
}
//printf("K: %x , U: %x\n", *(kernel_pml4 + PML4OFF(KERNBASE)), *(process->pml4 + PML4OFF(KERNBASE)));
//New cr3
//loadcr3((void *)process->cr3);
//ELF
entry = getELF(process -> fileName, process);
//printf("entry = %x\n", entry);
(process -> reg).rip = entry;
add_heap_vma(process);
add_stack_vma(process);
//AADY: 30 Apr
if(process->processID < 0)
{
process -> processID = generate_pid();
e_rsp = UXSTACKTOP - (process->processID * PAGE_SIZE);
(process -> ersp) = e_rsp;
process -> hasRan = 0; //Already done in pcb_alloc, a safety check here.
}
/*
//TEMP: 26th APR
//ASM to set up tss
__asm__ __volatile__("movq %%rsp, %0; \
movq $0x28,%%rax; \
ltr %%ax;"
: "=r" (tss.rsp0)
:
: "rax");
//tss.rsp0 = process->ersp;
//ASM to set up tss
__asm__ __volatile__("movq $0x28,%%rax; \
ltr %%ax;"
:
:
: "rax");
//printf("tss setting: %x\n",tss.rsp0);
*/
//switch_to_user_space(entry);
}
