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_CPU *cpu, sim_cia cia)
  36 {
  37   SIM_DESC sd = CPU_STATE (cpu);
  38
  39   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
  40     return nr_bytes;
  41
  42 #ifdef HAVE_DV_SOCKSER
  43   if (addr == UART_INCHAR_ADDR)
  44     {
  45       int c = dv_sockser_read (sd);
  46       if (c == -1)
  47         return 0;
  48       *(char *) source = c;
  49       return 1;
  50     }
  51   if (addr == UART_STATUS_ADDR)
  52     {
  53       int status = dv_sockser_status (sd);
  54       unsigned char *p = source;
  55       p[0] = 0;
  56       p[1] = (((status & DV_SOCKSER_INPUT_EMPTY)
  57 #ifdef UART_INPUT_READY0
  58                ? UART_INPUT_READY : 0)
  59 #else
  60                ? 0 : UART_INPUT_READY)
  61 #endif
  62               + ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0));
  63       return 2;
  64     }
  65 #endif
  66
  67   return nr_bytes;
  68 }
  69
  70 int
  71 device_io_write_buffer (device *me, const void *source, int space,
  72                         address_word addr, unsigned nr_bytes,
  73                         SIM_CPU *cpu, sim_cia cia)
  74 {
  75   SIM_DESC sd = CPU_STATE (cpu);
  76
  77 #if WITH_SCACHE
  78   /* MSPR support is deprecated but is kept in for upward compatibility
  79      with existing overlay support.  */
  80   if (addr == MSPR_ADDR)
  81     {
  82       if ((*(const char *) source & MSPR_PURGE) != 0)
  83         scache_flush (sd);
  84       return nr_bytes;
  85     }
  86   if (addr == MCCR_ADDR)
  87     {
  88       if ((*(const char *) source & MCCR_CP) != 0)
  89         scache_flush (sd);
  90       return nr_bytes;
  91     }
  92 #endif
  93
  94   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
  95     return nr_bytes;
  96
  97 #if HAVE_DV_SOCKSER
  98   if (addr == UART_OUTCHAR_ADDR)
  99     {
 100       int rc = dv_sockser_write (sd, *(char *) source);
 101       return rc == 1;
 102     }
 103 #endif
 104
 105   return nr_bytes;
 106 }
 107
 108 void device_error () {}