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716992c8c7
Do not use the "LoaderBlock->u.I386.CommonDataArea;" hack to use FreeLdr's DbgPrint function inside KDCOM, for the simple reason that while it works when KDCOM just initializes, the memory area where FreeLdr's DbgPrint function is, gets erased when ReactOS is running. As a result, all attempts to call the DbgPrint function when tracing something in KDCOM at the end of life of ReactOS, just fails lamentably (it hangs). We therefore cannot rely on external code to provide us with DbgPrint. Instead, implement a very simple DbgPrint function inside KDCOM, as done by KDGDB. The KD serial port serving for debugging KDCOM is chosen dynamically amongst the other free COM ports. This needs to be also fixed in KDVM. [KDGDB] Instead of hardcoding the KD serial port number serving for debugging KDGDB, determine it dynamically amongst the other free COM ports. svn path=/trunk/; revision=70405
150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/*
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* COPYRIGHT: GPL, see COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: drivers/base/kddll/kdserial.c
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* PURPOSE: Serial communication functions for the kernel debugger.
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* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
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*/
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#include "kddll.h"
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/* FUNCTIONS ******************************************************************/
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/******************************************************************************
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* \name KdpSendBuffer
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* \brief Sends a buffer of data to the serial KD port.
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* \param Buffer Pointer to the data.
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* \param Size Size of data in bytes.
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*/
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VOID
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NTAPI
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KdpSendBuffer(
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IN PVOID Buffer,
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IN ULONG Size)
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{
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PUCHAR ByteBuffer = Buffer;
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while (Size-- > 0)
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{
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KdpSendByte(*ByteBuffer++);
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}
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}
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/******************************************************************************
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* \name KdpReceiveBuffer
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* \brief Receives data from the KD port and fills a buffer.
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* \param Buffer Pointer to a buffer that receives the data.
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* \param Size Size of data to receive in bytes.
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* \return KDP_PACKET_RECEIVED if successful.
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* KDP_PACKET_TIMEOUT if the receice timed out.
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*/
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KDP_STATUS
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NTAPI
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KdpReceiveBuffer(
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OUT PVOID Buffer,
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IN ULONG Size)
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{
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PUCHAR ByteBuffer = Buffer;
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UCHAR Byte;
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KDP_STATUS Status;
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while (Size-- > 0)
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{
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/* Try to get a byte from the port */
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Status = KdpReceiveByte(&Byte);
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if (Status != KDP_PACKET_RECEIVED)
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return Status;
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*ByteBuffer++ = Byte;
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}
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return KDP_PACKET_RECEIVED;
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}
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/******************************************************************************
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* \name KdpReceivePacketLeader
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* \brief Receives a packet leadr from the KD port.
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* \param PacketLeader Pointer to an ULONG that receives the packet leader.
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* \return KDP_PACKET_RECEIVED if successful.
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* KDP_PACKET_TIMEOUT if the receive timed out.
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* KDP_PACKET_RESEND if a breakin byte was detected.
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*/
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KDP_STATUS
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NTAPI
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KdpReceivePacketLeader(
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OUT PULONG PacketLeader)
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{
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UCHAR Index = 0, Byte, Buffer[4];
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KDP_STATUS KdStatus;
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/* Set first character to 0 */
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Buffer[0] = 0;
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do
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{
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/* Receive a single byte */
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KdStatus = KdpReceiveByte(&Byte);
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/* Check for timeout */
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if (KdStatus == KDP_PACKET_TIMEOUT)
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{
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/* Check if we already got a breakin byte */
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if (Buffer[0] == BREAKIN_PACKET_BYTE)
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{
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return KDP_PACKET_RESEND;
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}
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/* Report timeout */
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return KDP_PACKET_TIMEOUT;
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}
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/* Check if we received a byte */
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if (KdStatus == KDP_PACKET_RECEIVED)
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{
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/* Check if this is a valid packet leader byte */
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if (Byte == PACKET_LEADER_BYTE ||
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Byte == CONTROL_PACKET_LEADER_BYTE)
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{
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/* Check if we match the first byte */
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if (Byte != Buffer[0])
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{
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/* No, this is the new byte 0! */
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Index = 0;
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}
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/* Store the byte in the buffer */
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Buffer[Index] = Byte;
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/* Continue with next byte */
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Index++;
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continue;
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}
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/* Check for breakin byte */
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if (Byte == BREAKIN_PACKET_BYTE)
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{
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KDDBGPRINT("BREAKIN_PACKET_BYTE\n");
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Index = 0;
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Buffer[0] = Byte;
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continue;
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}
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}
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/* Restart */
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Index = 0;
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Buffer[0] = 0;
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}
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while (Index < 4);
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/* Enable the debugger */
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KD_DEBUGGER_NOT_PRESENT = FALSE;
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SharedUserData->KdDebuggerEnabled |= 0x00000002;
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/* Return the received packet leader */
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*PacketLeader = *(PULONG)Buffer;
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return KDP_PACKET_RECEIVED;
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}
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/* EOF */
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