Function pmap_pti_init

freebsd/amd64/amd64/pmap.c:10601–10643

}

static void
pmap_pti_init(void)
{
	vm_page_t pml4_pg;
	pdp_entry_t *pdpe;
	vm_offset_t va;
	int i;

	if (!pti)
		return;
	pti_obj = vm_pager_allocate(OBJT_PHYS, NULL, 0, VM_PROT_ALL, 0, NULL);
	VM_OBJECT_WLOCK(pti_obj);
	pml4_pg = pmap_pti_alloc_page();
	pti_pml4 = (pml4_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(pml4_pg));
	for (va = VM_MIN_KERNEL_ADDRESS; va <= VM_MAX_KERNEL_ADDRESS &&
	    va >= VM_MIN_KERNEL_ADDRESS && va > NBPML4; va += NBPML4) {
		pdpe = pmap_pti_pdpe(va);
		pmap_pti_wire_pte(pdpe);
	}
	pmap_pti_add_kva_locked((vm_offset_t)&__pcpu[0],
	    (vm_offset_t)&__pcpu[0] + sizeof(__pcpu[0]) * MAXCPU, false);
	pmap_pti_add_kva_locked((vm_offset_t)idt, (vm_offset_t)idt +
	    sizeof(struct gate_descriptor) * NIDT, false);
	CPU_FOREACH(i) {
		/* Doublefault stack IST 1 */
		va = __pcpu[i].pc_common_tss.tss_ist1 + sizeof(struct nmi_pcpu);
		pmap_pti_add_kva_locked(va - DBLFAULT_STACK_SIZE, va, false);
		/* NMI stack IST 2 */
		va = __pcpu[i].pc_common_tss.tss_ist2 + sizeof(struct nmi_pcpu);
		pmap_pti_add_kva_locked(va - NMI_STACK_SIZE, va, false);
		/* MC# stack IST 3 */
		va = __pcpu[i].pc_common_tss.tss_ist3 +
		    sizeof(struct nmi_pcpu);
		pmap_pti_add_kva_locked(va - MCE_STACK_SIZE, va, false);
		/* DB# stack IST 4 */
		va = __pcpu[i].pc_common_tss.tss_ist4 + sizeof(struct nmi_pcpu);
		pmap_pti_add_kva_locked(va - DBG_STACK_SIZE, va, false);
	}
	pmap_pti_add_kva_locked((vm_offset_t)kernphys + KERNBASE,
	    (vm_offset_t)etext, true);
	pti_finalized = true;
	VM_OBJECT_WUNLOCK(pti_obj);
}
SYSINIT(pmap_pti, SI_SUB_CPU + 1, SI_ORDER_ANY, pmap_pti_init, NULL);

static pdp_entry_t *