---
title: Bridge Header Offsets
framework: pcidriverkit
role: collectionGroup
role_heading: API Collection
path: pcidriverkit/bridge-header-offsets-enum
---

# Bridge Header Offsets

Constants that specify offsets to distinct registers in a memory range.

## Topics

### Offsets

- [kPCI2PCIOffsetPrimaryBus](pcidriverkit/kpci2pcioffsetprimarybus.md)
- [kPCI2PCIOffsetSecondaryBus](pcidriverkit/kpci2pcioffsetsecondarybus.md)
- [kPCI2PCIOffsetSubordinateBus](pcidriverkit/kpci2pcioffsetsubordinatebus.md)
- [kPCI2PCIOffsetSecondaryLT](pcidriverkit/kpci2pcioffsetsecondarylt.md)
- [kPCI2PCIOffsetIORange](pcidriverkit/kpci2pcioffsetiorange.md)
- [kPCI2PCIOffsetMemoryRange](pcidriverkit/kpci2pcioffsetmemoryrange.md)
- [kPCI2PCIOffsetPrefetchMemoryRange](pcidriverkit/kpci2pcioffsetprefetchmemoryrange.md)
- [kPCI2PCIOffsetPrefetchUpperBase](pcidriverkit/kpci2pcioffsetprefetchupperbase.md)
- [kPCI2PCIOffsetPrefetchUpperLimit](pcidriverkit/kpci2pcioffsetprefetchupperlimit.md)
- [kPCI2PCIOffsetUpperIORange](pcidriverkit/kpci2pcioffsetupperiorange.md)
- [kPCI2PCIOffsetBridgeControl](pcidriverkit/kpci2pcioffsetbridgecontrol.md)

## See Also

### Reading and Writing Configuration Data

- [ConfigurationRead8](pcidriverkit/iopcidevice/configurationread8.md)
- [ConfigurationRead16](pcidriverkit/iopcidevice/configurationread16.md)
- [ConfigurationRead32](pcidriverkit/iopcidevice/configurationread32.md)
- [ConfigurationWrite8](pcidriverkit/iopcidevice/configurationwrite8.md)
- [ConfigurationWrite16](pcidriverkit/iopcidevice/configurationwrite16.md)
- [ConfigurationWrite32](pcidriverkit/iopcidevice/configurationwrite32.md)
- [Configuration Data Offsets](pcidriverkit/configuration-data-offsets-enum.md)
- [Command Register Bits](pcidriverkit/command-register-bits-enum.md)
- [Status Register Bits](pcidriverkit/status-register-bits-enum.md)