sim/i960/devices.c

   1 /* i960 device support
   2    Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
   3    Contributed by Cygnus Solutions.
   4
   5 This file is part of GDB, the GNU debugger.
   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, or (at your option)
  10 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 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "sim-main.h"
  22
  23 #ifdef HAVE_DV_SOCKSER
  24 #include "dv-sockser.h"
  25 #endif
  26
  27 /* Handling the MSPR register is done by creating a device in the core
  28    mapping that winds up here.  */
  29
  30 device i960_devices;
  31
  32 int
  33 device_io_read_buffer (device *me, void *source, int space,
  34                        address_word addr, unsigned nr_bytes,
  35                        SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)
  36 {
  37   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
  38     return nr_bytes;
  39
  40 #ifdef HAVE_DV_SOCKSER
  41   if (addr == UART_INCHAR_ADDR)
  42     {
  43       int c = dv_sockser_read (sd);
  44       if (c == -1)
  45         return 0;
  46       *(char *) source = c;
  47       return 1;
  48     }
  49   if (addr == UART_STATUS_ADDR)
  50     {
  51       int status = dv_sockser_status (sd);
  52       unsigned char *p = source;
  53       p[0] = 0;
  54       p[1] = (((status & DV_SOCKSER_INPUT_EMPTY)
  55 #ifdef UART_INPUT_READY0
  56                ? UART_INPUT_READY : 0)
  57 #else
  58                ? 0 : UART_INPUT_READY)
  59 #endif
  60               + ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0));
  61       return 2;
  62     }
  63 #endif
  64
  65   return nr_bytes;
  66 }
  67
  68 int
  69 device_io_write_buffer (device *me, const void *source, int space,
  70                         address_word addr, unsigned nr_bytes,
  71                         SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)
  72 {
  73 #if WITH_SCACHE
  74   /* MSPR support is deprecated but is kept in for upward compatibility
  75      with existing overlay support.  */
  76   if (addr == MSPR_ADDR)
  77     {
  78       if ((*(const char *) source & MSPR_PURGE) != 0)
  79         scache_flush (sd);
  80       return nr_bytes;
  81     }
  82   if (addr == MCCR_ADDR)
  83     {
  84       if ((*(const char *) source & MCCR_CP) != 0)
  85         scache_flush (sd);
  86       return nr_bytes;
  87     }
  88 #endif
  89
  90   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
  91     return nr_bytes;
  92
  93 #if HAVE_DV_SOCKSER
  94   if (addr == UART_OUTCHAR_ADDR)
  95     {
  96       int rc = dv_sockser_write (sd, *(char *) source);
  97       return rc == 1;
  98     }
  99 #endif
 100
 101   return nr_bytes;
 102 }
 103
 104 void
 105 device_error (device *me, char *message, ...)
 106 {
 107 }