void kmem_submap( vm_map_t map, vm_map_t parent, vm_offset_t *min, vm_offset_t *max, vm_size_t size, boolean_t pageable) { vm_offset_t addr; kern_return_t kr; size = round_page(size); /* * Need reference on submap object because it is internal * to the vm_system. vm_object_enter will never be called * on it (usual source of reference for vm_map_enter). */ vm_object_reference(vm_submap_object); addr = vm_map_min(parent); kr = vm_map_enter(parent, &addr, size, (vm_offset_t) 0, TRUE, vm_submap_object, (vm_offset_t) 0, FALSE, VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT); if (kr != KERN_SUCCESS) panic("kmem_submap"); pmap_reference(vm_map_pmap(parent)); vm_map_setup(map, vm_map_pmap(parent), addr, addr + size, pageable); kr = vm_map_submap(parent, addr, addr + size, map); if (kr != KERN_SUCCESS) panic("kmem_submap"); *min = addr; *max = addr + size; }
/* * kmem_suballoc: * * Allocates 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 */ vm_map_t kmem_suballoc(vm_map_t parent, vm_offset_t *min, vm_offset_t *max, vm_size_t size, boolean_t superpage_align) { int ret; vm_map_t result; 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_suballoc: bad status return of %d", ret); *max = *min + size; result = vm_map_create(vm_map_pmap(parent), *min, *max); if (result == NULL) panic("kmem_suballoc: cannot create submap"); if (vm_map_submap(parent, *min, *max, result) != KERN_SUCCESS) panic("kmem_suballoc: unable to change range to submap"); return (result); }