reactos/boot/freeldr/freeldr/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 #include <freeldr.h>
  25 #include <cportlib/cportlib.h>
  26
  27 /* MACROS *******************************************************************/
  28
  29 #if DBG
  30
  31 #define DEFAULT_BAUD_RATE   19200
  32
  33
  34 /* STATIC VARIABLES *********************************************************/
  35
  36 static ULONG BaseArray[] = {0, 0x3F8, 0x2F8, 0x3E8, 0x2E8};
  37
  38 /* The COM port must only be initialized once! */
  39 static CPPORT Rs232ComPort;
  40 static BOOLEAN PortInitialized = FALSE;
  41
  42
  43 /* FUNCTIONS *********************************************************/
  44
  45 BOOLEAN Rs232PortInitialize(IN ULONG ComPort,
  46                             IN ULONG BaudRate)
  47 {
  48     NTSTATUS Status;
  49     PUCHAR Address;
  50
  51     if (PortInitialized == FALSE)
  52     {
  53         if (BaudRate == 0)
  54         {
  55             BaudRate = DEFAULT_BAUD_RATE;
  56         }
  57
  58         if (ComPort == 0)
  59         {
  60             if (CpDoesPortExist(UlongToPtr(BaseArray[2])))
  61             {
  62                 Address = UlongToPtr(BaseArray[2]);
  63             }
  64             else if (CpDoesPortExist(UlongToPtr(BaseArray[1])))
  65             {
  66                 Address = UlongToPtr(BaseArray[1]);
  67             }
  68             else
  69             {
  70                 return FALSE;
  71             }
  72         }
  73         else if (ComPort <= 4) // 4 == MAX_COM_PORTS
  74         {
  75             if (CpDoesPortExist(UlongToPtr(BaseArray[ComPort])))
  76             {
  77                 Address = UlongToPtr(BaseArray[ComPort]);
  78             }
  79             else
  80             {
  81                 return FALSE;
  82             }
  83         }
  84         else
  85         {
  86             return FALSE;
  87         }
  88
  89         Status = CpInitialize(&Rs232ComPort, Address, BaudRate);
  90         if (!NT_SUCCESS(Status)) return FALSE;
  91
  92         PortInitialized = TRUE;
  93     }
  94
  95     return TRUE;
  96 }
  97
  98 BOOLEAN Rs232PortGetByte(PUCHAR ByteReceived)
  99 {
 100     if (PortInitialized == FALSE)
 101         return FALSE;
 102
 103     return (CpGetByte(&Rs232ComPort, ByteReceived, TRUE, FALSE) == CP_GET_SUCCESS);
 104 }
 105
 106 /*
 107 BOOLEAN Rs232PortPollByte(PUCHAR ByteReceived)
 108 {
 109     if (PortInitialized == FALSE)
 110         return FALSE;
 111
 112     return (CpGetByte(&Rs232ComPort, ByteReceived, FALSE) == CP_GET_SUCCESS);
 113 }
 114 */
 115
 116 VOID Rs232PortPutByte(UCHAR ByteToSend)
 117 {
 118     if (PortInitialized == FALSE)
 119         return;
 120
 121     CpPutByte(&Rs232ComPort, ByteToSend);
 122 }
 123
 124 #endif /* DBG */
 125
 126 BOOLEAN Rs232PortInUse(PUCHAR Base)
 127 {
 128 #if DBG
 129     return ( (PortInitialized && (Rs232ComPort.Address == Base)) ? TRUE : FALSE );
 130 #else
 131     return FALSE;
 132 #endif
 133 }
 134
 135 #endif /* not _M_ARM */