sim/common/dv-core.c

   1 /*  This file is part of the program psim.
   2
   3     Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19     */
  20
  21
  22 #include "sim-main.h"
  23 #include "hw-main.h"
  24
  25 /* DEVICE
  26
  27    core - root of the device tree
  28
  29    DESCRIPTION
  30
  31    The core device, positioned at the root of the device tree appears
  32    to its child devices as a normal device just like every other
  33    device in the tree.
  34
  35    Internally it is implemented using a core object.  Requests to
  36    attach (or detach) address spaces are passed to that core object.
  37    Requests to transfer (DMA) data are reflected back down the device
  38    tree using the core_map data transfer methods.
  39
  40    PROPERTIES
  41
  42    None.
  43
  44    */
  45
  46
  47 static void
  48 dv_core_attach_address_callback (struct hw *me,
  49                                  int level,
  50                                  int space,
  51                                  address_word addr,
  52                                  address_word nr_bytes,
  53                                  struct hw *client)
  54 {
  55   HW_TRACE ((me, "attach - level=%d, space=%d, addr=0x%lx, nr_bytes=%ld, client=%s",
  56              level, space, (unsigned long) addr, (unsigned long) nr_bytes, hw_path (client)));
  57   /* NOTE: At preset the space is assumed to be zero.  Perhaphs the
  58      space should be mapped onto something for instance: space0 -
  59      unified memory; space1 - IO memory; ... */
  60   if (space != 0)
  61     hw_abort (me, "Hey! Unknown space %d", space);
  62   sim_core_attach (hw_system (me),
  63                    NULL, /*cpu*/
  64                    level,
  65                    access_read_write_exec,
  66                    space, addr,
  67                    nr_bytes,
  68                    0, /* modulo */
  69                    client,
  70                    NULL);
  71 }
  72
  73
  74 static unsigned
  75 dv_core_dma_read_buffer_callback (struct hw *me,
  76                                   void *dest,
  77                                   int space,
  78                                   unsigned_word addr,
  79                                   unsigned nr_bytes)
  80 {
  81   return sim_core_read_buffer (hw_system (me),
  82                                NULL, /*CPU*/
  83                                space, /*???*/
  84                                dest,
  85                                addr,
  86                                nr_bytes);
  87 }
  88
  89
  90 static unsigned
  91 dv_core_dma_write_buffer_callback (struct hw *me,
  92                                    const void *source,
  93                                    int space,
  94                                    unsigned_word addr,
  95                                    unsigned nr_bytes,
  96                                    int violate_read_only_section)
  97 {
  98   return sim_core_write_buffer (hw_system (me),
  99                                 NULL, /*cpu*/
 100                                 space, /*???*/
 101                                 source,
 102                                 addr,
 103                                 nr_bytes);
 104 }
 105
 106
 107 static void
 108 dv_core_finish (struct hw *me)
 109 {
 110   set_hw_attach_address (me, dv_core_attach_address_callback);
 111   set_hw_dma_write_buffer (me, dv_core_dma_write_buffer_callback);
 112   set_hw_dma_read_buffer (me, dv_core_dma_read_buffer_callback);
 113 }
 114
 115 const struct hw_descriptor dv_core_descriptor[] = {
 116   { "core", dv_core_finish, },
 117   { NULL },
 118 };