Function kmem_alloc_attr_domain

freebsd/vm/vm_kern.c:210–250

* Allocates a region from the kernel address map and physical pages * within the specified address range to the kernel object. Creates a * wired mapping from this region to these pages, and returns the * region's starting virtual address. The allocated pages are not * necessarily physically contiguous. If M_ZERO is specified through the * given flags, then the pages are zeroed before they

 *	given flags, then the pages are zeroed before they are mapped.
 */
static vm_offset_t
kmem_alloc_attr_domain(int domain, vm_size_t size, int flags, vm_paddr_t low,
    vm_paddr_t high, vm_memattr_t memattr)
{
	vmem_t *vmem;
	vm_object_t object;
	vm_offset_t addr, i, offset;
	vm_page_t m;
	int pflags;
	vm_prot_t prot;

	object = kernel_object;
	size = round_page(size);
	vmem = vm_dom[domain].vmd_kernel_arena;
	if (vmem_alloc(vmem, size, M_BESTFIT | flags, &addr))
		return (0);
	offset = addr - VM_MIN_KERNEL_ADDRESS;
	pflags = malloc2vm_flags(flags) | VM_ALLOC_WIRED;
	prot = (flags & M_EXEC) != 0 ? VM_PROT_ALL : VM_PROT_RW;
	VM_OBJECT_WLOCK(object);
	for (i = 0; i < size; i += PAGE_SIZE) {
		m = kmem_alloc_contig_pages(object, atop(offset + i),
		    domain, pflags, 1, low, high, PAGE_SIZE, 0, memattr);
		if (m == NULL) {
			VM_OBJECT_WUNLOCK(object);
			kmem_unback(object, addr, i);
			vmem_free(vmem, addr, size);
			return (0);
		}
		KASSERT(vm_page_domain(m) == domain,
		    ("kmem_alloc_attr_domain: Domain mismatch %d != %d",
		    vm_page_domain(m), domain));
		if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
			pmap_zero_page(m);
		vm_page_valid(m);
		pmap_enter(kernel_pmap, addr + i, m, prot,
		    prot | PMAP_ENTER_WIRED, 0);
	}
	VM_OBJECT_WUNLOCK(object);
	return (addr);
}

vm_offset_t
kmem_alloc_attr(vm_size_t size, int flags, vm_paddr_t low, vm_paddr_t high,