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windows-nt/Source/XPSP1/NT/base/busdrv/pci/id.c

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/*++
Copyright (c) 1997-2000 Microsoft Corporation
Module Name:
id.c
Abstract:
This module contains functions used in the generation of responses
to a IRP_MN_QUERY_ID IRP.
Author:
Peter Johnston (peterj) 08-Mar-1997
Revision History:
--*/
#include "pcip.h"
//++
//
// PciQueryId returns UNICODE strings when the ID type is DeviceID
// or InstanceID. For HardwareIDs and CompatibleIDs it returns a
// a zero terminated list of zero terminated UNICODE strings (MULTI_SZ).
//
// The normal process of converting a string to a unicode string involves
// taking it's length, allocating pool memory for the new string and
// calling RtlAnsiStringToUnicodeString to do the conversion. The following
// is an attempt to be a little more efficient in terms of both size and
// speed by keeping track of the relevant string data as it goes past in
// the process of creating the set of strings.
//
//--
#define MAX_ANSI_STRINGS 8
#define MAX_ANSI_BUFFER 256
typedef struct _PCI_ID_BUFFER {
ULONG Count; // number of ansi strings
ANSI_STRING AnsiStrings[MAX_ANSI_STRINGS];
USHORT UnicodeSZSize[MAX_ANSI_STRINGS];
USHORT UnicodeBufferSize;
PUCHAR NextFree; // first unused byte in buffer
UCHAR Bytes[MAX_ANSI_BUFFER];// buffer start address
} PCI_ID_BUFFER, *PPCI_ID_BUFFER;
//
// All functins in this module are pageable.
//
// Define prototypes for module local functions.
//
VOID
PciIdPrintf(
IN PPCI_ID_BUFFER IdBuffer,
PCCHAR Format,
...
);
VOID
PciIdPrintfAppend(
IN PPCI_ID_BUFFER IdBuffer,
PCCHAR Format,
...
);
VOID
PciInitIdBuffer(
IN PPCI_ID_BUFFER IdBuffer
);
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, PciGetDeviceDescriptionMessage)
#pragma alloc_text(PAGE, PciIdPrintf)
#pragma alloc_text(PAGE, PciIdPrintfAppend)
#pragma alloc_text(PAGE, PciInitIdBuffer)
#pragma alloc_text(PAGE, PciQueryId)
#pragma alloc_text(PAGE, PciQueryDeviceText)
#endif
VOID
PciInitIdBuffer(
IN PPCI_ID_BUFFER IdBuffer
)
{
IdBuffer->NextFree = IdBuffer->Bytes;
IdBuffer->UnicodeBufferSize = 0;
IdBuffer->Count = 0;
}
VOID
PciIdPrintf(
IN PPCI_ID_BUFFER IdBuffer,
PCCHAR Format,
...
)
{
LONG length;
ULONG index;
PUCHAR buffer;
LONG maxLength;
va_list ap;
PANSI_STRING ansiString;
ASSERT(IdBuffer->Count < MAX_ANSI_STRINGS);
//
// Make my life easier, keep repeated values in locals.
//
index = IdBuffer->Count;
buffer = IdBuffer->NextFree;
maxLength = MAX_ANSI_BUFFER - (LONG)(buffer - IdBuffer->Bytes);
ansiString = &IdBuffer->AnsiStrings[index];
//
// Pass the format string and subsequent data into (effectively)
// sprintf.
//
va_start(ap, Format);
length = _vsnprintf(buffer, maxLength, Format, ap);
va_end(ap);
ASSERT(length < maxLength);
//
// RtlInitAnsiString without the strlen.
//
ansiString->Buffer = buffer;
ansiString->Length = (USHORT)length;
ansiString->MaximumLength = (USHORT)length;
//
// Get the length of this string in a unicode world and record it
// for later when the whole set of strings gets converted (keep
// the total size also).
//
IdBuffer->UnicodeSZSize[index] =
(USHORT)RtlAnsiStringToUnicodeSize(ansiString);
IdBuffer->UnicodeBufferSize += IdBuffer->UnicodeSZSize[index];
//
// Bump buffer pointer for next iteration and the count.
//
IdBuffer->NextFree += length + 1;
IdBuffer->Count++;
}
VOID
PciIdPrintfAppend(
IN PPCI_ID_BUFFER IdBuffer,
PCCHAR Format,
...
)
{
LONG length;
ULONG index;
PUCHAR buffer;
LONG maxLength;
va_list ap;
PANSI_STRING ansiString;
ASSERT(IdBuffer->Count);
//
// Make my life easier, keep repeated values in locals.
//
index = IdBuffer->Count - 1;
buffer = IdBuffer->NextFree - 1;
maxLength = MAX_ANSI_BUFFER - (LONG)(buffer - IdBuffer->Bytes);
ansiString = &IdBuffer->AnsiStrings[index];
//
// Pass the format string and subsequent data into (effectively)
// sprintf.
//
va_start(ap, Format);
length = _vsnprintf(buffer, maxLength, Format, ap);
va_end(ap);
ASSERT(length < maxLength);
//
// Increase the ansi string length by the length of the new
// portion of the string.
//
ansiString->Length += (USHORT)length;
ansiString->MaximumLength += (USHORT)length;
//
// Get the length of this string in a unicode world and record it
// for later when the whole set of strings gets converted (keep
// the total size also).
//
IdBuffer->UnicodeSZSize[index] =
(USHORT)RtlAnsiStringToUnicodeSize(ansiString);
IdBuffer->UnicodeBufferSize += IdBuffer->UnicodeSZSize[index];
//
// Bump buffer pointer for next iteration.
//
IdBuffer->NextFree += length;
}
NTSTATUS
PciQueryId(
IN PPCI_PDO_EXTENSION PdoExtension,
IN BUS_QUERY_ID_TYPE IdType,
IN OUT PWSTR *BusQueryId
)
{
PCI_ID_BUFFER idBuffer;
UCHAR venDevString[sizeof("PCI\\VEN_vvvv&DEV_dddd")];
NTSTATUS status;
UNICODE_STRING unicodeId;
PVOID unicodeBuffer;
ULONG i;
ULONG subsystem;
PPCI_PDO_EXTENSION current;
PAGED_CODE();
*BusQueryId = NULL;
//
// In all the following we want PCI\VEN_vvvv&DEV_dddd.
//
sprintf(venDevString,
"PCI\\VEN_%04X&DEV_%04X",
PdoExtension->VendorId,
PdoExtension->DeviceId);
PciInitIdBuffer(&idBuffer);
subsystem = (PdoExtension->SubsystemId << 16) |
PdoExtension->SubsystemVendorId;
switch (IdType) {
case BusQueryInstanceID:
//
// Caller wants an instance ID for this device. The PCI
// driver reports that it does NOT generate unique IDs for
// devices so PnP Manager will prepend bus information.
//
// The instance ID is of the form-
//
// AABBCCDDEEFF...XXYYZZ
//
// Where AA is the slot number (device/function) of the device
// on the bus, BB, CC,... XX, YY, ZZ are the slot number of the
// PCI-to-PCI bridges on their parent busses all the way up to
// the root. A device on the root bus will have only one entry,
// AA.
//
current = PdoExtension;
//
// Initialize empty buffer.
//
PciIdPrintf(&idBuffer,"");
for (;;) {
PciIdPrintfAppend(&idBuffer,
"%02X",
PCI_DEVFUNC(current)
);
if (PCI_PDO_ON_ROOT(current)) {
break;
}
current = PCI_PARENT_PDO(current)->DeviceExtension;
}
break;
case BusQueryHardwareIDs:
case BusQueryDeviceID:
//
// Hardware and Compatible IDs are generated as specified
// in the ACPI spec (section 6.1.2 in version 0.9).
//
// Hardware IDs are a list of identifiers of the form
//
// PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss&REV_rr
// PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss
// PCI\VEN_vvvv&DEV_dddd&REV_rr
// PCI\VEN_vvvv&DEV_dddd
//
// Where vvvv is the Vendor ID from config space,
// dddd is the Device ID,
// ssssssss is the Subsystem ID/Subsystem Vendor ID, and
// rr is the Revision ID.
//
// Device ID is the same as the first Hardware ID (ie most
// specific of all possible IDs).
//
PciIdPrintf(&idBuffer,
"%s&SUBSYS_%08X&REV_%02X",
venDevString,
subsystem,
PdoExtension->RevisionId);
if (IdType == BusQueryDeviceID) {
break;
}
PciIdPrintf(&idBuffer,
"%s&SUBSYS_%08X",
venDevString,
subsystem);
//
// Fall thru.
//
case BusQueryCompatibleIDs:
//
// If the subsystem is non-zero, the second two are compatible
// IDs, otherwise they are hardware IDs.
//
if (((subsystem == 0) && (IdType == BusQueryHardwareIDs)) ||
((subsystem != 0) && (IdType == BusQueryCompatibleIDs))) {
PciIdPrintf(&idBuffer,
"%s&REV_%02X",
venDevString,
PdoExtension->RevisionId);
//
// Device ID is PCI\VEN_vvvv&DEV_dddd
//
PciIdPrintf(&idBuffer,
"%s",
venDevString);
}
if (IdType == BusQueryHardwareIDs) {
//
// The comment in the Memphis code says "Add
// special Intel entry". Odd that these entries
// are absent from the spec. They are added for
// PIIX4 which has the same vendor and device IDs
// for two different sub class codes.
//
// These two entries are
//
// PCI\VEN_vvvv&DEV_dddd&CC_ccsspp
// PCI\VEN_vvvv&DEV_dddd&CC_ccss
//
// (See below for cc, ss and pp explanaitions).
//
PciIdPrintf(&idBuffer,
"%s&CC_%02X%02X%02X",
venDevString,
PdoExtension->BaseClass,
PdoExtension->SubClass,
PdoExtension->ProgIf);
PciIdPrintf(&idBuffer,
"%s&CC_%02X%02X",
venDevString,
PdoExtension->BaseClass,
PdoExtension->SubClass);
}
if (IdType == BusQueryCompatibleIDs) {
//
// The Compatible IDs list, consists of the above plus
//
// PCI\VEN_vvvv&CC_ccsspp
// PCI\VEN_vvvv&CC_ccss
// PCI\VEN_vvvv
// PCI\CC_ccsspp
// PCI\CC_ccss
//
// Where cc is the Class Code from config space,
// ss is the Sub-Class Code, and
// pp is the programming interface.
//
// WARNING: Revise the size of the buffer if you increase
// the above list.
//
PciIdPrintf(&idBuffer,
"PCI\\VEN_%04X&CC_%02X%02X%02X",
PdoExtension->VendorId,
PdoExtension->BaseClass,
PdoExtension->SubClass,
PdoExtension->ProgIf);
PciIdPrintf(&idBuffer,
"PCI\\VEN_%04X&CC_%02X%02X",
PdoExtension->VendorId,
PdoExtension->BaseClass,
PdoExtension->SubClass);
PciIdPrintf(&idBuffer,
"PCI\\VEN_%04X",
PdoExtension->VendorId);
PciIdPrintf(&idBuffer,
"PCI\\CC_%02X%02X%02X",
PdoExtension->BaseClass,
PdoExtension->SubClass,
PdoExtension->ProgIf);
PciIdPrintf(&idBuffer,
"PCI\\CC_%02X%02X",
PdoExtension->BaseClass,
PdoExtension->SubClass);
}
//
// HardwareIDs and CompatibleIDs are MULTI_SZ, add a
// NULL list to terminate it all.
//
PciIdPrintf(&idBuffer, "");
break;
default:
PciDebugPrint(PciDbgVerbose,
"PciQueryId expected ID type = %d\n",
IdType);
//ASSERT(0 && "Unexpected BUS_QUERY_ID_TYPE");
return STATUS_NOT_SUPPORTED;
}
ASSERT(idBuffer.Count > 0);
//
// What we have is a (bunch of) ansi strings. What we need is a
// (bunch of) unicode strings.
//
unicodeBuffer = ExAllocatePool(PagedPool | POOL_COLD_ALLOCATION, idBuffer.UnicodeBufferSize);
if (unicodeBuffer == NULL) {
return STATUS_INSUFFICIENT_RESOURCES;
}
//
// Build the (possibly MULTI_SZ) unicode string(s).
//
PciDebugPrint(PciDbgPrattling,
"PciQueryId(%d)\n",
IdType);
unicodeId.Buffer = unicodeBuffer;
unicodeId.MaximumLength = idBuffer.UnicodeBufferSize;
for (i = 0; i < idBuffer.Count; i++) {
PciDebugPrint(PciDbgPrattling,
" <- \"%s\"\n",
idBuffer.AnsiStrings[i].Buffer);
status = RtlAnsiStringToUnicodeString(&unicodeId,
&idBuffer.AnsiStrings[i],
FALSE);
if (!NT_SUCCESS(status)) {
ASSERT(NT_SUCCESS(status));
ExFreePool(unicodeBuffer);
return status;
}
//
// Bump the base pointer and decrement the max length for the
// next trip thru the loop.
//
(ULONG_PTR)unicodeId.Buffer += idBuffer.UnicodeSZSize[i];
unicodeId.MaximumLength -= idBuffer.UnicodeSZSize[i];
}
*BusQueryId = unicodeBuffer;
return status;
}
PWSTR
PciGetDescriptionMessage(
IN ULONG MessageNumber
)
{
PWSTR description = NULL;
NTSTATUS status;
PMESSAGE_RESOURCE_ENTRY messageEntry;
status = RtlFindMessage(PciDriverObject->DriverStart,
11, // <-- I wonder what this is.
LANG_NEUTRAL,
MessageNumber,
&messageEntry);
if (NT_SUCCESS(status)) {
if (messageEntry->Flags & MESSAGE_RESOURCE_UNICODE) {
//
// Our caller wants a copy they can free, also we need to
// strip the trailing CR/LF. The Length field of the
// message structure includes both the header and the
// actual text.
//
// Note: The message resource entry length will always be a
// multiple of 4 bytes in length. The 2 byte null terminator
// could be in either the last or second last WCHAR position.
//
ULONG textLength;
textLength = messageEntry->Length -
FIELD_OFFSET(MESSAGE_RESOURCE_ENTRY, Text) -
2 * sizeof(WCHAR);
description = (PWSTR)(messageEntry->Text);
if (description[textLength / sizeof(WCHAR)] == 0) {
textLength -= sizeof(WCHAR);
}
ASSERT((LONG)textLength > 1);
ASSERT(description[textLength / sizeof(WCHAR)] == 0x000a);
description = ExAllocatePool(PagedPool | POOL_COLD_ALLOCATION, textLength);
if (description) {
//
// Copy the text except for the CR/LF/NULL
//
textLength -= sizeof(WCHAR);
RtlCopyMemory(description, messageEntry->Text, textLength);
//
// New NULL terminator.
//
description[textLength / sizeof(WCHAR)] = 0;
}
} else {
//
// RtlFindMessage returns a string? Wierd.
//
ANSI_STRING ansiDescription;
UNICODE_STRING unicodeDescription;
RtlInitAnsiString(&ansiDescription, messageEntry->Text);
//
// Strip CR/LF off the end of the string.
//
ansiDescription.Length -= 2;
//
// Turn it all into a unicode string so we can grab the buffer
// and return that to our caller.
//
status = RtlAnsiStringToUnicodeString(
&unicodeDescription,
&ansiDescription,
TRUE
);
description = unicodeDescription.Buffer;
}
}
return description;
}
PWSTR
PciGetDeviceDescriptionMessage(
IN UCHAR BaseClass,
IN UCHAR SubClass
)
{
PWSTR deviceDescription = NULL;
ULONG messageNumber;
messageNumber = (BaseClass << 8) | SubClass;
deviceDescription = PciGetDescriptionMessage(messageNumber);
if (!deviceDescription) {
#define TEMP_DESCRIPTION L"PCI Device"
deviceDescription = ExAllocatePool(PagedPool, sizeof(TEMP_DESCRIPTION));
if (deviceDescription) {
RtlCopyMemory(deviceDescription,
TEMP_DESCRIPTION,
sizeof(TEMP_DESCRIPTION));
}
}
return deviceDescription;
}
NTSTATUS
PciQueryDeviceText(
IN PPCI_PDO_EXTENSION PdoExtension,
IN DEVICE_TEXT_TYPE TextType,
IN LCID LocaleId,
IN OUT PWSTR *DeviceText
)
{
PWSTR locationFormat;
ULONG textLength;
PAGED_CODE();
switch (TextType) {
case DeviceTextDescription:
*DeviceText = PciGetDeviceDescriptionMessage(PdoExtension->BaseClass,
PdoExtension->SubClass);
if (*DeviceText) {
return STATUS_SUCCESS;
}
return STATUS_NOT_SUPPORTED;
case DeviceTextLocationInformation:
locationFormat = PciGetDescriptionMessage(PCI_LOCATION_TEXT);
if (locationFormat) {
// Compute max size for location information string
textLength = wcslen(locationFormat) + 2 + 2 + 2 + 1;
*DeviceText = ExAllocatePool(PagedPool | POOL_COLD_ALLOCATION,
textLength * sizeof(WCHAR));
if (*DeviceText) {
swprintf(*DeviceText, locationFormat,
(ULONG) PdoExtension->ParentFdoExtension->BaseBus,
(ULONG) PdoExtension->Slot.u.bits.DeviceNumber,
(ULONG) PdoExtension->Slot.u.bits.FunctionNumber);
}
ExFreePool(locationFormat);
if (*DeviceText) {
return STATUS_SUCCESS;
} else {
return STATUS_INSUFFICIENT_RESOURCES;
}
}
// fall thru if we couldn't get format string
default:
return STATUS_NOT_SUPPORTED;
}
}
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