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reactos/drivers/base/kdgdb/kdcom.c
Dmitry Borisov 4501bbac8f
[KDCOM][NTOS:INBV][FREELDR] Decrease default baud rate for PC-98 target (#2601) 
According to PC-9801 Bible p. 50, divisor for PIT will become unsupported in some cases after having removed the fractional part. Replace 19200 value with 9600 which is supported by both 10 MHz and 8 MHz machines.
2020-04-21 23:22:42 +03:00

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/*
* COPYRIGHT: GPL, see COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/base/kdgdb/kdcom.c
* PURPOSE: COM port functions for the kernel debugger.
*/
#include "kdgdb.h"
#include <cportlib/cportlib.h>
#include <arc/arc.h>
#include <stdlib.h>
#include <ndk/halfuncs.h>
/* Serial debug connection */
#if defined(SARCH_PC98)
#define DEFAULT_DEBUG_PORT 2 /* COM2 */
#define DEFAULT_DEBUG_COM1_IRQ 4
#define DEFAULT_DEBUG_COM2_IRQ 5
#define DEFAULT_DEBUG_BAUD_RATE 9600
#define DEFAULT_BAUD_RATE 9600
#else
#define DEFAULT_DEBUG_PORT 2 /* COM2 */
#define DEFAULT_DEBUG_COM1_IRQ 4
#define DEFAULT_DEBUG_COM2_IRQ 3
#define DEFAULT_DEBUG_BAUD_RATE 115200
#define DEFAULT_BAUD_RATE 19200
#endif
#if defined(_M_IX86) || defined(_M_AMD64)
#if defined(SARCH_PC98)
const ULONG BaseArray[] = {0, 0x30, 0x238};
#else
const ULONG BaseArray[] = {0, 0x3F8, 0x2F8, 0x3E8, 0x2E8};
#endif
#elif defined(_M_PPC)
const ULONG BaseArray[] = {0, 0x800003F8};
#elif defined(_M_MIPS)
const ULONG BaseArray[] = {0, 0x80006000, 0x80007000};
#elif defined(_M_ARM)
const ULONG BaseArray[] = {0, 0xF1012000};
#else
#error Unknown architecture
#endif
#define MAX_COM_PORTS (sizeof(BaseArray) / sizeof(BaseArray[0]) - 1)
/* GLOBALS ********************************************************************/
CPPORT KdComPort;
ULONG KdComPortIrq = 0; // Not used at the moment.
#ifdef KDDEBUG
CPPORT KdDebugComPort;
#endif
/* DEBUGGING ******************************************************************/
#ifdef KDDEBUG
ULONG KdpDbgPrint(const char *Format, ...)
{
va_list ap;
int Length;
char* ptr;
CHAR Buffer[512];
va_start(ap, Format);
Length = _vsnprintf(Buffer, sizeof(Buffer), Format, ap);
va_end(ap);
/* Check if we went past the buffer */
if (Length == -1)
{
/* Terminate it if we went over-board */
Buffer[sizeof(Buffer) - 1] = '\n';
/* Put maximum */
Length = sizeof(Buffer);
}
ptr = Buffer;
while (Length--)
{
if (*ptr == '\n')
CpPutByte(&KdDebugComPort, '\r');
CpPutByte(&KdDebugComPort, *ptr++);
}
return 0;
}
#endif
/* FUNCTIONS ******************************************************************/
NTSTATUS
NTAPI
KdD0Transition(VOID)
{
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
KdD3Transition(VOID)
{
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
KdSave(IN BOOLEAN SleepTransition)
{
/* Nothing to do on COM ports */
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
KdRestore(IN BOOLEAN SleepTransition)
{
/* Nothing to do on COM ports */
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
KdpPortInitialize(IN ULONG ComPortNumber,
IN ULONG ComPortBaudRate)
{
NTSTATUS Status;
Status = CpInitialize(&KdComPort,
UlongToPtr(BaseArray[ComPortNumber]),
ComPortBaudRate);
if (!NT_SUCCESS(Status))
{
return STATUS_INVALID_PARAMETER;
}
KdComPortInUse = KdComPort.Address;
return STATUS_SUCCESS;
}
/******************************************************************************
* \name KdDebuggerInitialize0
* \brief Phase 0 initialization.
* \param [opt] LoaderBlock Pointer to the Loader parameter block. Can be NULL.
* \return Status
*/
NTSTATUS
NTAPI
KdDebuggerInitialize0(IN PLOADER_PARAMETER_BLOCK LoaderBlock OPTIONAL)
{
ULONG ComPortNumber = DEFAULT_DEBUG_PORT;
ULONG ComPortBaudRate = DEFAULT_DEBUG_BAUD_RATE;
PCHAR CommandLine, PortString, BaudString, IrqString;
ULONG Value;
/* Check if we have a LoaderBlock */
if (LoaderBlock)
{
/* Get the Command Line */
CommandLine = LoaderBlock->LoadOptions;
/* Upcase it */
_strupr(CommandLine);
/* Get the port and baud rate */
PortString = strstr(CommandLine, "DEBUGPORT");
BaudString = strstr(CommandLine, "BAUDRATE");
IrqString = strstr(CommandLine, "IRQ");
/* Check if we got the /DEBUGPORT parameter */
if (PortString)
{
/* Move past the actual string, to reach the port*/
PortString += strlen("DEBUGPORT");
/* Now get past any spaces and skip the equal sign */
while (*PortString == ' ') PortString++;
PortString++;
/* Do we have a serial port? */
if (strncmp(PortString, "COM", 3) != 0)
{
return STATUS_INVALID_PARAMETER;
}
/* Check for a valid Serial Port */
PortString += 3;
Value = atol(PortString);
if (Value >= sizeof(BaseArray) / sizeof(BaseArray[0]))
{
return STATUS_INVALID_PARAMETER;
}
/* Set the port to use */
ComPortNumber = Value;
}
/* Check if we got a baud rate */
if (BaudString)
{
/* Move past the actual string, to reach the rate */
BaudString += strlen("BAUDRATE");
/* Now get past any spaces */
while (*BaudString == ' ') BaudString++;
/* And make sure we have a rate */
if (*BaudString)
{
/* Read and set it */
Value = atol(BaudString + 1);
if (Value) ComPortBaudRate = Value;
}
}
/* Check Serial Port Settings [IRQ] */
if (IrqString)
{
/* Move past the actual string, to reach the rate */
IrqString += strlen("IRQ");
/* Now get past any spaces */
while (*IrqString == ' ') IrqString++;
/* And make sure we have an IRQ */
if (*IrqString)
{
/* Read and set it */
Value = atol(IrqString + 1);
if (Value) KdComPortIrq = Value;
}
}
}
#ifdef KDDEBUG
/*
* Try to find a free COM port and use it as the KD debugging port.
* NOTE: Inspired by reactos/boot/freeldr/freeldr/comm/rs232.c, Rs232PortInitialize(...)
*/
{
/*
* Start enumerating COM ports from the last one to the first one,
* and break when we find a valid port.
* If we reach the first element of the list, the invalid COM port,
* then it means that no valid port was found.
*/
ULONG ComPort;
for (ComPort = MAX_COM_PORTS; ComPort > 0; ComPort--)
{
/* Check if the port exist; skip the KD port */
if ((ComPort != ComPortNumber) && CpDoesPortExist(UlongToPtr(BaseArray[ComPort])))
break;
}
if (ComPort != 0)
CpInitialize(&KdDebugComPort, UlongToPtr(BaseArray[ComPort]), DEFAULT_BAUD_RATE);
}
#endif
/* Initialize the port */
return KdpPortInitialize(ComPortNumber, ComPortBaudRate);
}
/******************************************************************************
* \name KdDebuggerInitialize1
* \brief Phase 1 initialization.
* \param [opt] LoaderBlock Pointer to the Loader parameter block. Can be NULL.
* \return Status
*/
NTSTATUS
NTAPI
KdDebuggerInitialize1(IN PLOADER_PARAMETER_BLOCK LoaderBlock OPTIONAL)
{
return STATUS_SUCCESS;
}
VOID
NTAPI
KdpSendByte(_In_ UCHAR Byte)
{
/* Send the byte */
CpPutByte(&KdComPort, Byte);
}
KDSTATUS
NTAPI
KdpPollByte(OUT PUCHAR OutByte)
{
/* Poll the byte */
if (CpGetByte(&KdComPort, OutByte, FALSE, FALSE) == CP_GET_SUCCESS)
{
return KdPacketReceived;
}
else
{
return KdPacketTimedOut;
}
}
KDSTATUS
NTAPI
KdpReceiveByte(_Out_ PUCHAR OutByte)
{
USHORT CpStatus;
do
{
CpStatus = CpGetByte(&KdComPort, OutByte, TRUE, FALSE);
} while (CpStatus == CP_GET_NODATA);
/* Get the byte */
if (CpStatus == CP_GET_SUCCESS)
{
return KdPacketReceived;
}
return KdPacketTimedOut;
}
KDSTATUS
NTAPI
KdpPollBreakIn(VOID)
{
KDSTATUS KdStatus;
UCHAR Byte;
KdStatus = KdpPollByte(&Byte);
if (KdStatus == KdPacketReceived)
{
if (Byte == 0x03)
{
KDDBGPRINT("BreakIn Polled.\n");
return KdPacketReceived;
}
else if (Byte == '$')
{
/* GDB tried to send a new packet. N-ack it. */
KdpSendByte('-');
}
}
return KdPacketTimedOut;
}
/* EOF */
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