sim/frv/devices.c

   1 /* frv device support
   2    Copyright (C) 1998-2013 Free Software Foundation, Inc.
   3    Contributed by Red Hat.
   4
   5 This file is part of the GNU simulators.
   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 3 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
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* ??? All of this is just to get something going.  wip!  */
  21
  22 #include "sim-main.h"
  23
  24 #ifdef HAVE_DV_SOCKSER
  25 #include "dv-sockser.h"
  26 #endif
  27
  28 device frv_devices;
  29
  30 int
  31 device_io_read_buffer (device *me, void *source, int space,
  32                        address_word addr, unsigned nr_bytes,
  33                        SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)
  34 {
  35   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
  36     return nr_bytes;
  37
  38 #ifdef HAVE_DV_SOCKSER
  39   if (addr == UART_INCHAR_ADDR)
  40     {
  41       int c = dv_sockser_read (sd);
  42       if (c == -1)
  43         return 0;
  44       *(char *) source = c;
  45       return 1;
  46     }
  47   if (addr == UART_STATUS_ADDR)
  48     {
  49       int status = dv_sockser_status (sd);
  50       unsigned char *p = source;
  51       p[0] = 0;
  52       p[1] = (((status & DV_SOCKSER_INPUT_EMPTY)
  53 #ifdef UART_INPUT_READY0
  54                ? UART_INPUT_READY : 0)
  55 #else
  56                ? 0 : UART_INPUT_READY)
  57 #endif
  58               + ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0));
  59       return 2;
  60     }
  61 #endif
  62
  63   return nr_bytes;
  64 }
  65
  66 int
  67 device_io_write_buffer (device *me, const void *source, int space,
  68                         address_word addr, unsigned nr_bytes,
  69                         SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)
  70 {
  71
  72 #if WITH_SCACHE
  73   if (addr == MCCR_ADDR)
  74     {
  75       if ((*(const char *) source & MCCR_CP) != 0)
  76         scache_flush (sd);
  77       return nr_bytes;
  78     }
  79 #endif
  80
  81   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
  82     return nr_bytes;
  83
  84 #if HAVE_DV_SOCKSER
  85   if (addr == UART_OUTCHAR_ADDR)
  86     {
  87       int rc = dv_sockser_write (sd, *(char *) source);
  88       return rc == 1;
  89     }
  90 #endif
  91
  92   return nr_bytes;
  93 }
  94
  95 void device_error (device *me, const char *message, ...) {}