Add config interface start (PciReadWriteConfigSpace, PciReadSlotConfig)

[reactos.git] / reactos / drivers / bus / pcix / pci / id.c

diff --git a/reactos/drivers/bus/pcix/pci/id.c b/reactos/drivers/bus/pcix/pci/id.c
index d4fd910..c1d711b 100644 (file)
--- a/reactos/drivers/bus/pcix/pci/id.c
+++ b/reactos/drivers/bus/pcix/pci/id.c
@@ -16,4 +16,95 @@
 
 /* FUNCTIONS ******************************************************************/
 
+PWCHAR
+NTAPI
+PciGetDescriptionMessage(IN ULONG Identifier,
+                         OUT PULONG Length)
+{
+    PMESSAGE_RESOURCE_ENTRY Entry;
+    ULONG TextLength;
+    PWCHAR Description, Buffer;
+    ANSI_STRING MessageString;
+    UNICODE_STRING UnicodeString;
+    NTSTATUS Status;
+
+    /* Find the message identifier in the message table */
+    MessageString.Buffer = NULL;
+    Status = RtlFindMessage(PciDriverObject->DriverStart,
+                            11, // RT_MESSAGETABLE
+                            LANG_NEUTRAL,
+                            Identifier,
+                            &Entry);
+    if (!NT_SUCCESS(Status)) return NULL;
+
+    /* Check if the resource data is Unicode or ANSI */
+    if (Entry->Flags & MESSAGE_RESOURCE_UNICODE)
+    {
+        /* Subtract one space for the end-of-message terminator */
+        TextLength = Entry->Length -
+                     FIELD_OFFSET(MESSAGE_RESOURCE_ENTRY, Text) -
+                     sizeof(WCHAR);
+
+        /* Grab the text */
+        Description = (PWCHAR)Entry->Text;
+
+        /* Validate valid message length, ending with a newline character */
+        ASSERT(TextLength > 1);
+        ASSERT(Description[TextLength / sizeof(WCHAR) == L'\n']);
+
+        /* Allocate the buffer to hold the message string */
+        Buffer = ExAllocatePoolWithTag(PagedPool, TextLength, 'BicP');
+        if (!Buffer) return NULL;
+
+        /* Copy the message, minus the newline character, and terminate it */
+        RtlCopyMemory(Buffer, Entry->Text, TextLength - 1);
+        Buffer[TextLength / sizeof(WCHAR)] = UNICODE_NULL;
+
+        /* Return the length to the caller */
+        if (Length) *Length = UnicodeString.Length;
+    }
+    else
+    {
+        /* Initialize the entry as a string */
+        RtlInitAnsiString(&MessageString, (PCHAR)Entry->Text);
+
+        /* Remove the newline character */
+        MessageString.Length -= sizeof(CHAR);
+
+        /* Convert it to Unicode */
+        RtlAnsiStringToUnicodeString(&UnicodeString, &MessageString, TRUE);
+        Buffer = UnicodeString.Buffer;
+
+        /* Return the length to the caller */
+        if (Length) *Length = UnicodeString.Length;
+    }
+
+    /* Return the message buffer to the caller */
+    return Buffer;
+}
+
+PWCHAR
+NTAPI
+PciGetDeviceDescriptionMessage(IN UCHAR BaseClass,
+                               IN UCHAR SubClass)
+{
+    PWCHAR Message;
+    ULONG Identifier;
+
+    /* The message identifier in the table is encoded based on the PCI class */
+    Identifier = (BaseClass << 8) | SubClass;
+
+    /* Go grab the description message for this device */
+    Message = PciGetDescriptionMessage(Identifier, NULL);
+    if (!Message)
+    {
+        /* It wasn't found, allocate a buffer for a generic description */
+        Message = ExAllocatePoolWithTag(PagedPool, sizeof(L"PCI Device"), 'bicP');
+        if (Message) RtlCopyMemory(Message, L"PCI Device", sizeof(L"PCI Device"));
+    }
+
+    /* Return the description message */
+    return Message;
+}
+
 /* EOF */