mirror of
https://github.com/reactos/reactos.git
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149 lines
3.8 KiB
C
149 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@ewactos.org)
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*/
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#include "kddll.h"
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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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INT i;
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for (i = 0; i < Size; i++)
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{
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KdpSendByte(((PUCHAR)Buffer)[i]);
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}
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}
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/******************************************************************************
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* \name KdpReceiveBuffer
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* \brief Recieves 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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ULONG i;
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PUCHAR ByteBuffer = Buffer;
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KDP_STATUS Status;
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for (i = 0; i < Size; i++)
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{
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/* Try to get a byte from the port */
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Status = KdpReceiveByte(&ByteBuffer[i]);
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if (Status != KDP_PACKET_RECEIVED)
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{
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return Status;
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}
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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 Recieves 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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KdDebuggerNotPresent = 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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