Function pmap_kextract

freebsd/mips/mips/pmap.c:3579–3640

* Routine: pmap_kextract * Function: * Extract the physical page address associated * virtual address. */

 *		virtual address.
 */
vm_paddr_t
pmap_kextract(vm_offset_t va)
{
	int mapped;

	/*
	 * First, the direct-mapped regions.
	 */
#if defined(__mips_n64)
	if (va >= MIPS_XKPHYS_START && va < MIPS_XKPHYS_END)
		return (MIPS_XKPHYS_TO_PHYS(va));
#endif
	if (va >= MIPS_KSEG0_START && va < MIPS_KSEG0_END)
		return (MIPS_KSEG0_TO_PHYS(va));

	if (va >= MIPS_KSEG1_START && va < MIPS_KSEG1_END)
		return (MIPS_KSEG1_TO_PHYS(va));

	/*
	 * User virtual addresses.
	 */
	if (va < VM_MAXUSER_ADDRESS) {
		pt_entry_t *ptep;

		if (curproc && curproc->p_vmspace) {
			ptep = pmap_pte(&curproc->p_vmspace->vm_pmap, va);
			if (ptep) {
				return (TLBLO_PTE_TO_PA(*ptep) |
				    (va & PAGE_MASK));
			}
			return (0);
		}
	}

	/*
	 * Should be kernel virtual here, otherwise fail
	 */
	mapped = (va >= MIPS_KSEG2_START || va < MIPS_KSEG2_END);
#if defined(__mips_n64)
	mapped = mapped || (va >= MIPS_XKSEG_START || va < MIPS_XKSEG_END);
#endif
	/*
	 * Kernel virtual.
	 */

	if (mapped) {
		pt_entry_t *ptep;

		/* Is the kernel pmap initialized? */
		if (!CPU_EMPTY(&kernel_pmap->pm_active)) {
			/* It's inside the virtual address range */
			ptep = pmap_pte(kernel_pmap, va);
			if (ptep) {
				return (TLBLO_PTE_TO_PA(*ptep) |
				    (va & PAGE_MASK));
			}
		}
		return (0);