gnu/dist/gdb6/sim/frv/devices.c

   1 /* frv device support
   2    Copyright (C) 1998, 1999 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 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 /* ??? All of this is just to get something going.  wip!  */
  22
  23 #include "sim-main.h"
  24
  25 #ifdef HAVE_DV_SOCKSER
  26 #include "dv-sockser.h"
  27 #endif
  28
  29 device frv_devices;
  30
  31 int
  32 device_io_read_buffer (device *me, void *source, int space,
  33                        address_word addr, unsigned nr_bytes,
  34                        SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)
  35 {
  36   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
  37     return nr_bytes;
  38
  39 #ifdef HAVE_DV_SOCKSER
  40   if (addr == UART_INCHAR_ADDR)
  41     {
  42       int c = dv_sockser_read (sd);
  43       if (c == -1)
  44         return 0;
  45       *(char *) source = c;
  46       return 1;
  47     }
  48   if (addr == UART_STATUS_ADDR)
  49     {
  50       int status = dv_sockser_status (sd);
  51       unsigned char *p = source;
  52       p[0] = 0;
  53       p[1] = (((status & DV_SOCKSER_INPUT_EMPTY)
  54 #ifdef UART_INPUT_READY0
  55                ? UART_INPUT_READY : 0)
  56 #else
  57                ? 0 : UART_INPUT_READY)
  58 #endif
  59               + ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0));
  60       return 2;
  61     }
  62 #endif
  63
  64   return nr_bytes;
  65 }
  66
  67 int
  68 device_io_write_buffer (device *me, const void *source, int space,
  69                         address_word addr, unsigned nr_bytes,
  70                         SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)
  71 {
  72
  73 #if WITH_SCACHE
  74   if (addr == MCCR_ADDR)
  75     {
  76       if ((*(const char *) source & MCCR_CP) != 0)
  77         scache_flush (sd);
  78       return nr_bytes;
  79     }
  80 #endif
  81
  82   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
  83     return nr_bytes;
  84
  85 #if HAVE_DV_SOCKSER
  86   if (addr == UART_OUTCHAR_ADDR)
  87     {
  88       int rc = dv_sockser_write (sd, *(char *) source);
  89       return rc == 1;
  90     }
  91 #endif
  92
  93   return nr_bytes;
  94 }
  95
  96 void device_error (device *me, char* message, ...) {}