int TLBhandlePageFault(struct proc* p, void* va){
// cprintf("%d | [%s] page fault for process: %d with virtual address: 0x%x \n",proc->pid, __FUNCTION__, p->pid, va);
//Getting the pte from the process page directory
pte_t* desiredPageTableEntry = walkpgdir(p->pgdir, (const void*)va, 0);
if(desiredPageTableEntry == 0 || ( (*desiredPageTableEntry & PTE_P)==0) ){ //todo : should panic?
//cprintf("%d | [%s] error finding page table entry \n",proc->pid, __FUNCTION__);
return - 1;
}
// cprintf("%d | [%s] found page table entry. loading into TLB \n",proc->pid, __FUNCTION__);
//Making space for the pte in the tlb
pte_t* emptySpaceInTLB = walkpgdir(cpu->kpgdir, (const void*)va, 1);
if(emptySpaceInTLB == 0){ //todo : should panic?
cprintf("%d | [%s] error - no free space in TLB! \n",proc->pid, __FUNCTION__);
return -1;
}
//Copying the pte to the TLB
*emptySpaceInTLB = *desiredPageTableEntry;
//register in the TLB structure
tlb_insert(va);
return 0;
}
hwaddr_t page_translate(lnaddr_t addr, size_t len)
{
hwaddr_t hwaddr = -1;
hwaddr_t __hwaddr = -1;
if ( tlb_read(addr, &hwaddr) ) {
test(hwaddr != -1, "tlb hit and wrong: return %x", hwaddr);
return hwaddr;
}
test(hwaddr == -1, "tlb miss and wrong");
Lnaddr lnaddr;
PDE dir_entry;
PTE page_entry;
lnaddr.val = addr;
hwaddr_t dir_addr = cpu.cr3.page_directory_base << 12;
dir_entry.val = hwaddr_read(dir_addr + 4 * lnaddr.dir, 4);
if (!dir_entry.present) {
Test(0, "dir fault: eip %#x, vaddr %#x, dir %#x, page %#x, offset %#x", cpu.eip, addr, lnaddr.dir, lnaddr.page, lnaddr.offset);
assert(0);
}
page_entry.val = hwaddr_read((dir_entry.page_frame << 12) + 4 * lnaddr.page, 4);
if (!page_entry.present) {
Test(0, "page fault: eip %#x, vaddr %#x, dir %#x, page %#x, offset %#x", cpu.eip, addr, lnaddr.dir, lnaddr.page, lnaddr.offset);
assert(0);
}
__hwaddr = (page_entry.page_frame << 12) + lnaddr.offset;
tlb_insert(addr, page_entry);
return __hwaddr;
}
