ntoskrnl/inbv/inbvport.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         BSD - See COPYING.ARM in the top level directory
   4  * FILE:            ntoskrnl/inbv/inbvport.c
   5  * PURPOSE:         Serial Port Boot Driver for Headless Terminal Support
   6  * PROGRAMMERS:     ReactOS Portable Systems Group
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #include <debug.h>
  13
  14 /* GLOBALS *******************************************************************/
  15
  16 CPPORT Port[4] =
  17 {
  18     {NULL, 0, TRUE},
  19     {NULL, 0, TRUE},
  20     {NULL, 0, TRUE},
  21     {NULL, 0, TRUE}
  22 };
  23
  24 /* FUNCTIONS *****************************************************************/
  25
  26 VOID
  27 NTAPI
  28 InbvPortEnableFifo(IN ULONG   PortId,
  29                    IN BOOLEAN Enable)
  30 {
  31     /* Set FIFO as requested */
  32     CpEnableFifo(Port[PortId].Address, Enable);
  33 }
  34
  35 VOID
  36 NTAPI
  37 InbvPortPutByte(IN ULONG   PortId,
  38                 IN BOOLEAN Output)
  39 {
  40     /* Send the byte */
  41     CpPutByte(&Port[PortId], Output);
  42 }
  43
  44 VOID
  45 NTAPI
  46 InbvPortTerminate(IN ULONG PortId)
  47 {
  48     /* The port is now available */
  49     Port[PortId].Address = NULL;
  50 }
  51
  52 BOOLEAN
  53 NTAPI
  54 InbvPortInitialize(IN  ULONG   BaudRate,
  55                    IN  ULONG   PortNumber,
  56                    IN  PUCHAR  PortAddress,
  57                    OUT PULONG  PortId,
  58                    IN  BOOLEAN IsMMIODevice)
  59 {
  60     /* Not yet supported */
  61     ASSERT(IsMMIODevice == FALSE);
  62
  63     /* Set default baud rate */
  64     if (BaudRate == 0) BaudRate = 19200;
  65
  66     /* Check if port or address given */
  67     if (PortNumber)
  68     {
  69         /* Pick correct address for port */
  70         if (!PortAddress)
  71         {
  72             switch (PortNumber)
  73             {
  74                 case 1:
  75                     PortAddress = (PUCHAR)0x3F8;
  76                     break;
  77
  78                 case 2:
  79                     PortAddress = (PUCHAR)0x2F8;
  80                     break;
  81
  82                 case 3:
  83                     PortAddress = (PUCHAR)0x3E8;
  84                     break;
  85
  86                 default:
  87                     PortNumber = 4;
  88                     PortAddress = (PUCHAR)0x2E8;
  89             }
  90         }
  91     }
  92     else
  93     {
  94         /* Pick correct port for address */
  95         PortAddress = (PUCHAR)0x2F8;
  96         if (CpDoesPortExist(PortAddress))
  97         {
  98             PortNumber = 2;
  99         }
 100         else
 101         {
 102             PortAddress = (PUCHAR)0x3F8;
 103             if (!CpDoesPortExist(PortAddress)) return FALSE;
 104             PortNumber = 1;
 105         }
 106     }
 107
 108     /* Initialize the port unless it's already up, and then return it */
 109     if (Port[PortNumber - 1].Address) return FALSE;
 110
 111     CpInitialize(&Port[PortNumber - 1], PortAddress, BaudRate);
 112     *PortId = PortNumber - 1;
 113
 114     return TRUE;
 115 }
 116
 117 /* EOF */