---
title: simpleRWFixed
framework: kernel
role: pseudoSymbol
path: kernel/iofwpseudoaddressspace/1813874-simplerwfixed
---

# simpleRWFixed

Create a Read/Write fixed address space at top of kCSRRegisterSpaceBaseAddressHi.

## Declaration

```occ
static IOFWPseudoAddressSpace * simpleRWFixed(
 IOFireWireBus *control,
 FWAddressaddr,
 UInt32len,
 const void *data ); 
```

## Parameters

- `control`: Points to IOFireWireBus object.
- `addr`: Points to starting address for the Pseudo Address Space.
- `len`: Length of the address range.
- `data`: The virtual address of the first byte in the memory.

## Return Value

Return Value returns valid IOFWPseudoAddressSpace on success, null on failure

## See Also

### Miscellaneous

- [contains](kernel/iofwpseudoaddressspace/1813836-contains.md)
- [doRead](kernel/iofwpseudoaddressspace/1813839-doread.md)
- [doWrite](kernel/iofwpseudoaddressspace/1813844-dowrite.md)
- [initAll](kernel/iofwpseudoaddressspace/1813848-initall.md)
- [initFixed](kernel/iofwpseudoaddressspace/1813852-initfixed.md)
- [setARxReqIntCompleteHandler](kernel/iofwpseudoaddressspace/1813855-setarxreqintcompletehandler.md)
- [simpleRead](kernel/iofwpseudoaddressspace/1813859-simpleread.md)
- [simpleReader](kernel/iofwpseudoaddressspace/1813862-simplereader.md)
- [simpleReadFixed](kernel/iofwpseudoaddressspace/1813866-simplereadfixed.md)
- [simpleRW(IOFireWireBus *, FWAddress *, IOMemoryDescriptor *)](kernel/iofwpseudoaddressspace/1813868-simplerw.md)
- [simpleRW(IOFireWireBus *, FWAddress *, UInt32, void *)](kernel/iofwpseudoaddressspace/1813871-simplerw.md)
- [simpleWriter](kernel/iofwpseudoaddressspace/1813878-simplewriter.md)