PCI_COMMON_CONFIG

PCI_COMMON_CONFIG

typedef struct _PCI_COMMON_CONFIG {

USHORT VendorID;

USHORT DeviceID;

USHORT Command;

USHORT Status;

UCHAR RevisionID;

UCHAR ProgIf;

UCHAR SubClass;

UCHAR BaseClass;

UCHAR CacheLineSize;

UCHAR LatencyTimer;

UCHAR HeaderType;

UCHAR BIST;

union {

struct _PCI_HEADER_TYPE_0 {

ULONG BaseAddresses[PCI_TYPE0_ADDRESSES];

ULONG Reserved1[2];

ULONG ROMBaseAddress;

ULONG Reserved2[2];

UCHAR InterruptLine;

UCHAR InterruptPin;

UCHAR MinimumGrant;

UCHAR MaximumLatency;

} type0;

} u;

UCHAR DeviceSpecific[192];

} PCI_COMMON_CONFIG, *PPCI_COMMON_CONFIG;

PCI_COMMON_CONFIG defines standard PCI configuration information returned by HalGetBusData or HalGetBusDataByOffset for the input BusDataType PCIConfiguration, assuming the caller-allocated Buffer is of sufficient Length.

Members

VendorID

Identifies the manufacturer of the device. This must be a value allocated by the PCI SIG.

DeviceID

Identifies the particular device. This value is assigned by the manufacturer.

Command

Accesses the PCI device’s control register. Writing a zero to this register renders the device logically disconnected from the PCI bus except for configuration access. Otherwise, the functionality of the register is device-dependent. Possible system-defined bit encodings for this member include:

PCI_ENABLE_IO_SPACE
PCI_ENABLE_MEMORY_SPACE
PCI_ENABLE_BUS_MASTER
PCI_ENABLE_SPECIAL_CYCLES
PCI_ENABLE_WRITE_AND_VALIDATE
PCI_ENABLE_VGA_COMPATIBLE_PALETTE
PCI_ENABLE_PARITY
PCI_ENABLE_WAIT_CYCLE
PCI_ENABLE_SERR
PCI_ENABLE_FAST_BACK_TO_BACK

Status

Accesses the PCI device’s status register. The functionality of this register is device-dependent. Possible system-defined bit encodings for this member include:

PCI_STATUS_FAST_BACK_TO_BACK // read-only
PCI_STATUS_DATA_PARITY_DETECTED
PCI_STATUS_DEVSEL// 2 bits wide
PCI_STATUS_SIGNALED_TARGET_ABORT
PCI_STATUS_RECEIVED_TARGET_ABORT
PCI_STATUS_RECEIVED_MASTER_ABORT
PCI_STATUS_SIGNALED_SYSTEM_ERROR
PCI_STATUS_DETECTED_PARITY_ERROR

RevisionID

Specifies the revision level of the device described by the DeviceID member. This value is assigned by the manufacturer.

ProgIf

Identifies the register-level programming interface, if any, for the device, according to the PCI classification scheme.

SubClass

Identifies the subtype, if any, of the device, according to the PCI classification scheme.

BaseClass

Identifies type of the device, according to the PCI classification scheme.

CacheLineSize

Contains the system cache line size in 32-bit units. This member is relevant only for PCI busmaster devices. The system determines this value during the boot process.

LatencyTimer

Contains the value of the latency timer in units of PCI bus clocks. This member is relevant only for PCI busmaster devices. The system determines this value during the boot process.

HeaderType

The system ORs the value of this member with PCI_MULTIFUNCTION, if appropriate to the device. The value of this member indicates the PCI_HEADER_TYPE_0 layout that follows.

BIST

Zero indicates that the device does not support built-in self test. Otherwise, the device supports built-in self test according to the PCI standard.

u.type0

Drivers call HalAssignSlotResources to configure these values and to get back the bus-relative values passed to other configuration routines.

DeviceSpecific

Contains any device-specific initialization information that is available.

Comments

Certain members of this structure have read-only values, so attempts to reset them are ignored. These members include the following: VendorID, DeviceID, RevisionID, ProgIf, SubClass, BaseClass, HeaderType, InterruptPin, MinimumGrant, and MaximumLatency.

Other members are provisionally read-only: that is, the system initializes them to their correct values, so drivers can safely treat them as read-only. However, they can be reset if a busmaster driver finds it necessary. These members include the following: CacheLineSize and LatencyTimer.