mirror of
https://github.com/reactos/reactos.git
synced 2024-11-18 13:01:40 +00:00
150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/*
|
|
* COPYRIGHT: GPL, see COPYING in the top level directory
|
|
* PROJECT: ReactOS kernel
|
|
* FILE: drivers/base/kddll/kdserial.c
|
|
* PURPOSE: Serial communication functions for the kernel debugger.
|
|
* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
|
|
*/
|
|
|
|
#include "kddll.h"
|
|
|
|
/* FUNCTIONS ******************************************************************/
|
|
|
|
/******************************************************************************
|
|
* \name KdpSendBuffer
|
|
* \brief Sends a buffer of data to the serial KD port.
|
|
* \param Buffer Pointer to the data.
|
|
* \param Size Size of data in bytes.
|
|
*/
|
|
VOID
|
|
NTAPI
|
|
KdpSendBuffer(
|
|
IN PVOID Buffer,
|
|
IN ULONG Size)
|
|
{
|
|
PUCHAR ByteBuffer = Buffer;
|
|
|
|
while (Size-- > 0)
|
|
{
|
|
KdpSendByte(*ByteBuffer++);
|
|
}
|
|
}
|
|
|
|
/******************************************************************************
|
|
* \name KdpReceiveBuffer
|
|
* \brief Receives data from the KD port and fills a buffer.
|
|
* \param Buffer Pointer to a buffer that receives the data.
|
|
* \param Size Size of data to receive in bytes.
|
|
* \return KDP_PACKET_RECEIVED if successful.
|
|
* KDP_PACKET_TIMEOUT if the receive timed out.
|
|
*/
|
|
KDP_STATUS
|
|
NTAPI
|
|
KdpReceiveBuffer(
|
|
OUT PVOID Buffer,
|
|
IN ULONG Size)
|
|
{
|
|
PUCHAR ByteBuffer = Buffer;
|
|
UCHAR Byte;
|
|
KDP_STATUS Status;
|
|
|
|
while (Size-- > 0)
|
|
{
|
|
/* Try to get a byte from the port */
|
|
Status = KdpReceiveByte(&Byte);
|
|
if (Status != KDP_PACKET_RECEIVED)
|
|
return Status;
|
|
|
|
*ByteBuffer++ = Byte;
|
|
}
|
|
|
|
return KDP_PACKET_RECEIVED;
|
|
}
|
|
|
|
|
|
/******************************************************************************
|
|
* \name KdpReceivePacketLeader
|
|
* \brief Receives a packet leader from the KD port.
|
|
* \param PacketLeader Pointer to an ULONG that receives the packet leader.
|
|
* \return KDP_PACKET_RECEIVED if successful.
|
|
* KDP_PACKET_TIMEOUT if the receive timed out.
|
|
* KDP_PACKET_RESEND if a breakin byte was detected.
|
|
*/
|
|
KDP_STATUS
|
|
NTAPI
|
|
KdpReceivePacketLeader(
|
|
OUT PULONG PacketLeader)
|
|
{
|
|
UCHAR Index = 0, Byte, Buffer[4];
|
|
KDP_STATUS KdStatus;
|
|
|
|
/* Set first character to 0 */
|
|
Buffer[0] = 0;
|
|
|
|
do
|
|
{
|
|
/* Receive a single byte */
|
|
KdStatus = KdpReceiveByte(&Byte);
|
|
|
|
/* Check for timeout */
|
|
if (KdStatus == KDP_PACKET_TIMEOUT)
|
|
{
|
|
/* Check if we already got a breakin byte */
|
|
if (Buffer[0] == BREAKIN_PACKET_BYTE)
|
|
{
|
|
return KDP_PACKET_RESEND;
|
|
}
|
|
|
|
/* Report timeout */
|
|
return KDP_PACKET_TIMEOUT;
|
|
}
|
|
|
|
/* Check if we received a byte */
|
|
if (KdStatus == KDP_PACKET_RECEIVED)
|
|
{
|
|
/* Check if this is a valid packet leader byte */
|
|
if (Byte == PACKET_LEADER_BYTE ||
|
|
Byte == CONTROL_PACKET_LEADER_BYTE)
|
|
{
|
|
/* Check if we match the first byte */
|
|
if (Byte != Buffer[0])
|
|
{
|
|
/* No, this is the new byte 0! */
|
|
Index = 0;
|
|
}
|
|
|
|
/* Store the byte in the buffer */
|
|
Buffer[Index] = Byte;
|
|
|
|
/* Continue with next byte */
|
|
Index++;
|
|
continue;
|
|
}
|
|
|
|
/* Check for breakin byte */
|
|
if (Byte == BREAKIN_PACKET_BYTE)
|
|
{
|
|
KDDBGPRINT("BREAKIN_PACKET_BYTE\n");
|
|
Index = 0;
|
|
Buffer[0] = Byte;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Restart */
|
|
Index = 0;
|
|
Buffer[0] = 0;
|
|
}
|
|
while (Index < 4);
|
|
|
|
/* Enable the debugger */
|
|
KD_DEBUGGER_NOT_PRESENT = FALSE;
|
|
SharedUserData->KdDebuggerEnabled |= 0x00000002;
|
|
|
|
/* Return the received packet leader */
|
|
*PacketLeader = *(PULONG)Buffer;
|
|
|
|
return KDP_PACKET_RECEIVED;
|
|
}
|
|
|
|
/* EOF */
|