# CreateMapping Maps the contents of the memory block to the address space of the current process. ``` virtual kern_return_t CreateMapping(uint64_t options, uint64_t address, uint64_t offset, uint64_t length, uint64_t alignment, IOMemoryMap **map); ``` ## Parameters `options` The options to use when mapping the memory into this process. For a list of possible values, see [Memory Map Options](/documentation/DriverKit/3325558-memory_map_options). `address` The address in the current process’ memory space at which to place the memory block. Specify a value for this parameter only if you also specified the [`kIOMemoryMapFixedAddress`](/documentation/DriverKit/kIOMemoryMapFixedAddress) option; otherwise, specify `0`. `offset` The offset into the buffer to use as the first byte. Specify a value for this parameter only if you want to map from somewhere other than the first byte of the buffer; otherwise, specify `0`. `length` The number of bytes accessible to the memory mapping. Specify `0` to map the entire buffer into memory, or specify a value that is less than the current length of the buffer. `alignment` The byte alignment to use when mapping the memory into your process. Specify only 0 for this parameter. `map` A variable in which to store the newly created [`IOMemoryMap`](/documentation/DriverKit/IOMemoryMap) object. The returned object has a retain count of 1. You are responsible for releasing this object when you are finished with it. ## Return Value [`kIOReturnSuccess`](/documentation/DriverKit/kIOReturnSuccess) on success, or another value if an error occurs. See [Error Codes](/documentation/DriverKit/error-codes). ## Discussion Use this method to map a memory buffer created by another process into the address space of the current process. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)