PCI configuration space is the underlying way that the Conventional PCI, PCI-X and PCI Express perform auto configuration of the cards inserted into their bus.

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Overview[edit]

PCI devices have a set of registers referred to as configuration space and PCI Express introduces extended configuration space for devices. Configuration space registers are mapped to memory locations. Device drivers and diagnostic software must have access to the configuration space, and operating systems typically use APIs to allow access to device configuration space. When the operating system does not have access methods defined or APIs for memory mapped configuration space requests, the driver or diagnostic software has the burden to access the configuration space in a manner that is compatible with the operating system's underlying access rules. In all systems, device drivers are encouraged to use APIs provided by the operating system to access the configuration space of the device.

Technical information[edit]

One of the major improvements the PCI Local Bus had over other I/O architectures was its configuration mechanism. In addition to the normal memory-mapped and I/O port spaces, each device function on the bus has a configuration space, which is 256 bytes long, addressable by knowing the eight-bit PCI bus, five-bit device, and three-bit function numbers for the device (commonly referred to as the BDF or B/D/F, as abbreviated from bus/device/function). This allows up to 256 buses, each with up to 32 devices, each supporting eight functions. A single PCI expansion card can respond as a device and must implement at least function number zero. The first 64 bytes of configuration space are standardized; the remainder are available for vendor-defined purposes.

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In order to allow more parts of configuration space to be standardized without conflicting with existing uses, there can be a list of capabilities defined within the first 192 bytes of PCI configuration space. Each capability has one byte that describes which capability it is, and one byte to point to the next capability. The number of additional bytes depends on the capability ID. If capabilities are being used, a bit in the Status register is set, and a pointer to the first in a linked list of capabilities is provided in the Cap. pointer register defined in the Standardized Registers.

PCI-X 2.0 introduced an extended configuration space, up to 4096 bytes. The only standardized part of extended configuration space is the first four bytes at 0x100 which are the start of an extended capability list. Extended capabilities are very much like normal capabilities except that they can refer to any byte in the extended configuration space (by using 12 bits instead of eight), have a four-bit version number and a 16-bit capability ID. Extended capability IDs overlap with normal capability IDs, but there is no chance of confusion as they are in separate lists.

Standardized registers[edit]

Standard registers of PCI Type 0 (Non-Bridge) Configuration Space Header

The Device ID (DID) and Vendor ID (VID) registers identify the device (such as an IC), and are commonly called the PCI ID. The 16-bit vendor ID is allocated by the PCI-SIG. The 16-bit device ID is then assigned by the vendor. There is an ongoing project to collect all known Vendor and Device IDs. (See the external links below.)

The Status register is used to report which features are supported and whether certain kinds of errors have occurred. The Command register contains a bitmask of features that can be individually enabled and disabled. The Header Type register values determine the different layouts of remaining 48 bytes (64-16) of the header, depending on the function of the device. That is, Type 1 headers for Root Complex, switches, and bridges. Then Type 0 for endpoints. The Cache Line Size register must be programmed before the device is told it can use the memory-write-and-invalidate transaction. This should normally match the CPU's cache line size, but the correct setting is system dependent. This register does not apply to PCI Express.

The Subsystem ID (SSID) and the Subsystem Vendor ID (SVID) differentiate specific model (such as an add-in card). While the Vendor ID is that of the chipset manufacturer, the Subsystem Vendor ID is that of the card manufacturer. The Subsystem ID is assigned by the subsystem vendor from the same number space as the Device ID. As an example, in the case of wireless network cards, the chipset manufacturer might be Broadcom or Atheros, and the card manufacturer might be Netgear or D-Link. Generally, the Vendor ID–Device ID combination designates which driver the host should load in order to handle the device, as all cards with the same VID:DID combination can be handled by the same driver. The Subsystem Vendor ID–Subsystem ID combination identifies the card, which is the kind of information the driver may use to apply a minor card-specific change in its operation.

Bus enumeration[edit]

To address a PCI device, it must be enabled by being mapped into the system's I/O port address space or memory-mapped address space. The system's firmware, device drivers or the operating system program the Base Address Registers (commonly called BARs) to inform the device of its address mapping by writing configuration commands to the PCI controller. Because all PCI devices are in an inactive state upon system reset, they will have no addresses assigned to them by which the operating system or device drivers can communicate with them. Either the BIOS or the operating system geographically addresses the PCI slots (for example, the first PCI slot, the second PCI slot, or the third PCI slot, etc., on the motherboard) through the PCI controller using the per slot IDSEL (Initialization Device Select) signals.

PCI BAR Bits
Bits	Description	Values
For all PCI BARs
0	Region Type	0 = Memory 1 = I/O (deprecated)
For Memory BARs
2-1	Locatable	0 = any 32-bit 1 = < 1 MiB 2 = any 64-bit
3	Prefetchable	0 = no 1 = yes
31-4	Base Address	16-byte aligned
For I/O BARs (Deprecated)
1	Reserved
31-2	Base Address	4-byte aligned

Since there is no direct met

Slot Configuration Is Calculated By