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 BOOLEAN
  27 NTAPI
  28 InbvPortPollOnly(IN ULONG PortId)
  29 {
  30     UCHAR Dummy;
  31
  32     /* Poll a byte from the port */
  33     return CpGetByte(&Port[PortId], &Dummy, FALSE, TRUE) == CP_GET_SUCCESS;
  34 }
  35
  36 BOOLEAN
  37 NTAPI
  38 InbvPortGetByte(IN  ULONG  PortId,
  39                 OUT PUCHAR Byte)
  40 {
  41     /* Read a byte from the port */
  42     return CpGetByte(&Port[PortId], Byte, TRUE, FALSE) == CP_GET_SUCCESS;
  43 }
  44
  45 VOID
  46 NTAPI
  47 InbvPortPutByte(IN ULONG PortId,
  48                 IN UCHAR Byte)
  49 {
  50     /* Send the byte */
  51     CpPutByte(&Port[PortId], Byte);
  52 }
  53
  54 VOID
  55 NTAPI
  56 InbvPortEnableFifo(IN ULONG   PortId,
  57                    IN BOOLEAN Enable)
  58 {
  59     /* Set FIFO as requested */
  60     CpEnableFifo(Port[PortId].Address, Enable);
  61 }
  62
  63 VOID
  64 NTAPI
  65 InbvPortTerminate(IN ULONG PortId)
  66 {
  67     /* The port is now available */
  68     Port[PortId].Address = NULL;
  69 }
  70
  71 BOOLEAN
  72 NTAPI
  73 InbvPortInitialize(IN  ULONG   BaudRate,
  74                    IN  ULONG   PortNumber,
  75                    IN  PUCHAR  PortAddress,
  76                    OUT PULONG  PortId,
  77                    IN  BOOLEAN IsMMIODevice)
  78 {
  79     /* Not yet supported */
  80     ASSERT(IsMMIODevice == FALSE);
  81
  82     /* Set default baud rate */
  83     if (BaudRate == 0) BaudRate = 19200;
  84
  85     /* Check if port or address given */
  86     if (PortNumber)
  87     {
  88         /* Pick correct address for port */
  89         if (!PortAddress)
  90         {
  91             switch (PortNumber)
  92             {
  93                 case 1:
  94                     PortAddress = (PUCHAR)0x3F8;
  95                     break;
  96
  97                 case 2:
  98                     PortAddress = (PUCHAR)0x2F8;
  99                     break;
 100
 101                 case 3:
 102                     PortAddress = (PUCHAR)0x3E8;
 103                     break;
 104
 105                 default:
 106                     PortNumber = 4;
 107                     PortAddress = (PUCHAR)0x2E8;
 108             }
 109         }
 110     }
 111     else
 112     {
 113         /* Pick correct port for address */
 114         PortAddress = (PUCHAR)0x2F8;
 115         if (CpDoesPortExist(PortAddress))
 116         {
 117             PortNumber = 2;
 118         }
 119         else
 120         {
 121             PortAddress = (PUCHAR)0x3F8;
 122             if (!CpDoesPortExist(PortAddress)) return FALSE;
 123             PortNumber = 1;
 124         }
 125     }
 126
 127     /* Initialize the port unless it's already up, and then return it */
 128     if (Port[PortNumber - 1].Address) return FALSE;
 129
 130     CpInitialize(&Port[PortNumber - 1], PortAddress, BaudRate);
 131     *PortId = PortNumber - 1;
 132
 133     return TRUE;
 134 }
 135
 136 /* EOF */