boot/freeldr/freeldr/lib/comm/rs232.c

   1 /*
   2  *  FreeLoader
   3  *  Copyright (C) 2001  Brian Palmer  <brianp@sginet.com>
   4  *  Copyright (C) 2001  Eric Kohl
   5  *  Copyright (C) 2001  Emanuele Aliberti
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #ifndef _M_ARM
  23
  24 /* INCLUDES *******************************************************************/
  25
  26 #include <freeldr.h>
  27 #include <cportlib/cportlib.h>
  28
  29 #if DBG
  30
  31 /* STATIC VARIABLES ***********************************************************/
  32
  33 #define DEFAULT_BAUD_RATE   19200
  34
  35 #if defined(_M_IX86) || defined(_M_AMD64)
  36 static const ULONG BaseArray[] = {0, 0x3F8, 0x2F8, 0x3E8, 0x2E8};
  37 #elif defined(_M_PPC)
  38 static const ULONG BaseArray[] = {0, 0x800003F8};
  39 #elif defined(_M_MIPS)
  40 static const ULONG BaseArray[] = {0, 0x80006000, 0x80007000};
  41 #elif defined(_M_ARM)
  42 static const ULONG BaseArray[] = {0, 0xF1012000};
  43 #else
  44 #error Unknown architecture
  45 #endif
  46
  47 #define MAX_COM_PORTS   (sizeof(BaseArray) / sizeof(BaseArray[0]) - 1)
  48
  49 /* The COM port must only be initialized once! */
  50 static ULONG Rs232ComPort = 0;
  51 static CPPORT Rs232ComPortInfo;
  52
  53 /* FUNCTIONS ******************************************************************/
  54
  55 BOOLEAN Rs232PortInitialize(IN ULONG ComPort,
  56                             IN ULONG BaudRate)
  57 {
  58     NTSTATUS Status;
  59     PUCHAR Address;
  60
  61     /*
  62      * Check whether it's the first time we initialize a COM port.
  63      * If not, check whether the specified one was already initialized.
  64      */
  65     if ((Rs232ComPort != 0) && (Rs232ComPort == ComPort))
  66         return TRUE;
  67
  68     if (BaudRate == 0)
  69         BaudRate = DEFAULT_BAUD_RATE;
  70
  71     if (ComPort == 0)
  72     {
  73         /*
  74          * Start enumerating COM ports from the last one to the first one,
  75          * and break when we find a valid port.
  76          * If we reach the first element of the list, the invalid COM port,
  77          * then it means that no valid port was found.
  78          */
  79         for (ComPort = MAX_COM_PORTS; ComPort > 0; ComPort--)
  80         {
  81             if (CpDoesPortExist(UlongToPtr(BaseArray[ComPort])))
  82             {
  83                 Address = UlongToPtr(BaseArray[ComPort]);
  84                 break;
  85             }
  86         }
  87         if (ComPort == 0)
  88             return FALSE;
  89     }
  90     else if (ComPort <= MAX_COM_PORTS)
  91     {
  92         if (CpDoesPortExist(UlongToPtr(BaseArray[ComPort])))
  93             Address = UlongToPtr(BaseArray[ComPort]);
  94         else
  95             return FALSE;
  96     }
  97     else
  98     {
  99         return FALSE;
 100     }
 101
 102     Status = CpInitialize(&Rs232ComPortInfo, Address, BaudRate);
 103     if (!NT_SUCCESS(Status)) return FALSE;
 104
 105     Rs232ComPort = ComPort;
 106
 107     return TRUE;
 108 }
 109
 110 BOOLEAN Rs232PortGetByte(PUCHAR ByteReceived)
 111 {
 112     if (Rs232ComPort == 0) return FALSE;
 113     return (CpGetByte(&Rs232ComPortInfo, ByteReceived, TRUE, FALSE) == CP_GET_SUCCESS);
 114 }
 115
 116 /*
 117 BOOLEAN Rs232PortPollByte(PUCHAR ByteReceived)
 118 {
 119     if (Rs232ComPort == 0) return FALSE;
 120     return (CpGetByte(&Rs232ComPortInfo, ByteReceived, FALSE, FALSE) == CP_GET_SUCCESS);
 121 }
 122 */
 123
 124 VOID Rs232PortPutByte(UCHAR ByteToSend)
 125 {
 126     if (Rs232ComPort == 0) return;
 127     CpPutByte(&Rs232ComPortInfo, ByteToSend);
 128 }
 129
 130 #endif /* DBG */
 131
 132 BOOLEAN Rs232PortInUse(PUCHAR Base)
 133 {
 134 #if DBG
 135     return ( ((Rs232ComPort != 0) && (Rs232ComPortInfo.Address == Base)) ? TRUE : FALSE );
 136 #else
 137     return FALSE;
 138 #endif
 139 }
 140
 141 #endif /* not _M_ARM */