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4501bbac8f
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.
150 lines
4 KiB
C
150 lines
4 KiB
C
/*
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* FreeLoader
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* Copyright (C) 2001 Brian Palmer <brianp@sginet.com>
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* Copyright (C) 2001 Eric Kohl
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* Copyright (C) 2001 Emanuele Aliberti
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _M_ARM
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/* INCLUDES *******************************************************************/
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#include <freeldr.h>
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#include <cportlib/cportlib.h>
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#if DBG
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/* STATIC VARIABLES ***********************************************************/
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#if defined(SARCH_PC98)
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#define DEFAULT_BAUD_RATE 9600
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#else
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#define DEFAULT_BAUD_RATE 19200
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#endif
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#if defined(_M_IX86) || defined(_M_AMD64)
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#if defined(SARCH_PC98)
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static const ULONG BaseArray[] = {0, 0x30, 0x238};
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#else
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static const ULONG BaseArray[] = {0, 0x3F8, 0x2F8, 0x3E8, 0x2E8};
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#endif
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#elif defined(_M_PPC)
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static const ULONG BaseArray[] = {0, 0x800003F8};
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#elif defined(_M_MIPS)
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static const ULONG BaseArray[] = {0, 0x80006000, 0x80007000};
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#elif defined(_M_ARM)
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static const ULONG BaseArray[] = {0, 0xF1012000};
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#else
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#error Unknown architecture
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#endif
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#define MAX_COM_PORTS (sizeof(BaseArray) / sizeof(BaseArray[0]) - 1)
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/* The COM port must only be initialized once! */
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static ULONG Rs232ComPort = 0;
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static CPPORT Rs232ComPortInfo;
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/* FUNCTIONS ******************************************************************/
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BOOLEAN Rs232PortInitialize(IN ULONG ComPort,
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IN ULONG BaudRate)
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{
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NTSTATUS Status;
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PUCHAR Address;
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/*
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* Check whether it's the first time we initialize a COM port.
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* If not, check whether the specified one was already initialized.
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*/
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if ((Rs232ComPort != 0) && (Rs232ComPort == ComPort))
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return TRUE;
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if (BaudRate == 0)
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BaudRate = DEFAULT_BAUD_RATE;
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if (ComPort == 0)
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{
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/*
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* Start enumerating COM ports from the last one to the first one,
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* and break when we find a valid port.
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* If we reach the first element of the list, the invalid COM port,
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* then it means that no valid port was found.
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*/
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for (ComPort = MAX_COM_PORTS; ComPort > 0; ComPort--)
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{
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if (CpDoesPortExist(UlongToPtr(BaseArray[ComPort])))
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{
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Address = UlongToPtr(BaseArray[ComPort]);
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break;
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}
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}
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if (ComPort == 0)
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return FALSE;
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}
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else if (ComPort <= MAX_COM_PORTS)
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{
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if (CpDoesPortExist(UlongToPtr(BaseArray[ComPort])))
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Address = UlongToPtr(BaseArray[ComPort]);
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else
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return FALSE;
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}
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else
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{
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return FALSE;
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}
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Status = CpInitialize(&Rs232ComPortInfo, Address, BaudRate);
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if (!NT_SUCCESS(Status)) return FALSE;
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Rs232ComPort = ComPort;
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return TRUE;
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}
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BOOLEAN Rs232PortGetByte(PUCHAR ByteReceived)
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{
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if (Rs232ComPort == 0) return FALSE;
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return (CpGetByte(&Rs232ComPortInfo, ByteReceived, TRUE, FALSE) == CP_GET_SUCCESS);
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}
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/*
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BOOLEAN Rs232PortPollByte(PUCHAR ByteReceived)
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{
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if (Rs232ComPort == 0) return FALSE;
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return (CpGetByte(&Rs232ComPortInfo, ByteReceived, FALSE, FALSE) == CP_GET_SUCCESS);
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}
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*/
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VOID Rs232PortPutByte(UCHAR ByteToSend)
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{
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if (Rs232ComPort == 0) return;
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CpPutByte(&Rs232ComPortInfo, ByteToSend);
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}
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#endif /* DBG */
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BOOLEAN Rs232PortInUse(PUCHAR Base)
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{
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#if DBG
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return ( ((Rs232ComPort != 0) && (Rs232ComPortInfo.Address == Base)) ? TRUE : FALSE );
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#else
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return FALSE;
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#endif
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}
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#endif /* not _M_ARM */
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