Function kmem_subinit

freebsd/vm/vm_kern.c:375–393

* kmem_subinit: * * Initializes a map to manage a subrange * of the kernel virtual address space. * * Arguments are as follows: * * parent Map to take range from * min, max Returned endpoints of map * size Size of range to find * superpage_align Request that min is superpage aligned */

 *	superpage_align	Request that min is superpage aligned
 */
void
kmem_subinit(vm_map_t map, vm_map_t parent, vm_offset_t *min, vm_offset_t *max,
    vm_size_t size, bool superpage_align)
{
	int ret;

	size = round_page(size);

	*min = vm_map_min(parent);
	ret = vm_map_find(parent, NULL, 0, min, size, 0, superpage_align ?
	    VMFS_SUPER_SPACE : VMFS_ANY_SPACE, VM_PROT_ALL, VM_PROT_ALL,
	    MAP_ACC_NO_CHARGE);
	if (ret != KERN_SUCCESS)
		panic("kmem_subinit: bad status return of %d", ret);
	*max = *min + size;
	vm_map_init(map, vm_map_pmap(parent), *min, *max);
	if (vm_map_submap(parent, *min, *max, map) != KERN_SUCCESS)
		panic("kmem_subinit: unable to change range to submap");
}

/*
 *	kmem_malloc_domain: