//uint64_t exception_stack;
void start(uint32_t* modulep, void* physbase, void* physfree)
{
uint64_t address = (uint64_t)(&idt);
uint16_t size_idt = (uint16_t)(sizeof(idt));
int my_variable = 0;
// int i = 922222895;
//int i =0;
struct smap_t {
uint64_t base, length;
uint32_t type;
}__attribute__((packed)) *smap;
struct process *newproc1,*newproc2,*newproc3;
cls();
// while(--i>0);
while(modulep[0] != 0x9001) modulep += modulep[1]+2;
for(smap = (struct smap_t*)(modulep+2); smap < (struct smap_t*)((char*)modulep+modulep[1]+2*4); ++smap) {
if (smap->type == 1 /* memory */ && smap->length != 0) {
kprintf("Available Physical Memory [%x-%x]\n", smap->base, smap->base + smap->length);
}
}
kprintf("tarfs in [%p:%p]\n", &_binary_tarfs_start, &_binary_tarfs_end);
set_all_handlers();
setup_idtr(address,size_idt);
npages_determine(134205440);
set_consts((uint64_t)physbase,(uint64_t)physfree);
mm_init();
loadcr3(katopa((uint64_t)pml4e),(uint64_t)physbase,(uint64_t)physfree);
my_variable++;
newproc1 = (struct process*)process_setup((uint64_t)physbase,(uint64_t)physfree,"bin/newhello");
curproc_count++;
newproc2 = process_setup((uint64_t)physbase,(uint64_t)physfree,"bin/sacrifice");
curproc_count++;
newproc3 = process_setup((uint64_t)physbase,(uint64_t)physfree,"bin/pragathi");
proc_status(newproc1);
proc_status(newproc2);
proc_status(newproc3);
cur_proc = newproc1;
/*while(i<10000)
{
kmalloc(30);
i++;
}*/
exception_stack = page_alloc();
first_sched();
while(1){}
}
void copy_on_write_handler(uint64_t faultAddr)
{
uint64_t * pte=NULL;
struct page* newPage=NULL;
struct page* faultPage=NULL;;
void * buffer = kmalloc(PAGE_SIZE);
pte = pml4Walk(current_pcb->pml4, faultAddr);
//printf("In COW HANDLER\n");
if(*pte & BIT_COW)
{
faultPage = getStrPtrFromPA((void *)(*pte));
if(faultPage->ref_count==2)//Allocate new writeable page and map it
{
//Important: Copy bytes from faulting page to temp buffer
memcpy(buffer, alignDown((void *)faultAddr), PAGE_SIZE);
page_remove(current_pcb->pml4, (void *)faultAddr);
newPage=page_alloc();
page_insert(current_pcb->pml4, (void *)faultAddr, newPage, BIT_PRESENT | BIT_RW | BIT_USER);
//Invalidate tlb?, included in page_remove
loadcr3(current_pcb->cr3);
//Copy back bytes from temp buffer
memcpy(alignDown((void *)faultAddr), buffer, PAGE_SIZE);
//printf("Inserted new page %x on COW fault on page ref=2\n", getPA(newPage));
}
else
{
//Make page rightable
*pte = (*pte & ~BIT_COW) | BIT_RW;
//printf("Made page writeable on COW fault, page ref=1\n");
}
}
}
