sim/ppc/hw_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 #ifndef _HW_CORE_C_
  23 #define _HW_CORE_C_
  24
  25 #include "device_table.h"
  26
  27 #include "corefile.h"
  28
  29
  30 /* DEVICE
  31
  32    core - root of the device tree
  33
  34    DESCRIPTION
  35
  36    The core device positioned at the root of the device tree appears
  37    to its child devices as a normal device just like every other
  38    device in the tree.
  39
  40    Internally it is implemented using a core object.  Requests to
  41    attach (or detach) address spaces are passed to that core object.
  42    Requests to transfer (DMA) data are reflected back down the device
  43    tree using the core_map data transfer methods.
  44
  45    PROPERTIES
  46
  47    None.
  48
  49    */
  50
  51
  52 static void
  53 hw_core_init_address_callback(device *me)
  54 {
  55   core *memory = (core*)device_data(me);
  56   core_init(memory);
  57 }
  58
  59
  60 static void
  61 hw_core_attach_address_callback(device *me,
  62                                 attach_type attach,
  63                                 int space,
  64                                 unsigned_word addr,
  65                                 unsigned nr_bytes,
  66                                 access_type access,
  67                                 device *client) /*callback/default*/
  68 {
  69   core *memory = (core*)device_data(me);
  70   if (space != 0)
  71     error("core_attach_address_callback() invalid address space\n");
  72   core_attach(memory,
  73               attach,
  74               space,
  75               access,
  76               addr,
  77               nr_bytes,
  78               client);
  79 }
  80
  81
  82 static unsigned
  83 hw_core_dma_read_buffer_callback(device *me,
  84                                  void *dest,
  85                                  int space,
  86                                  unsigned_word addr,
  87                                  unsigned nr_bytes)
  88 {
  89   core *memory = (core*)device_data(me);
  90   return core_map_read_buffer(core_readable(memory),
  91                               dest,
  92                               addr,
  93                               nr_bytes);
  94 }
  95
  96
  97 static unsigned
  98 hw_core_dma_write_buffer_callback(device *me,
  99                                   const void *source,
 100                                   int space,
 101                                   unsigned_word addr,
 102                                   unsigned nr_bytes,
 103                                   int violate_read_only_section)
 104 {
 105   core *memory = (core*)device_data(me);
 106   core_map *map = (violate_read_only_section
 107                    ? core_readable(memory)
 108                    : core_writeable(memory));
 109   return core_map_write_buffer(map,
 110                                source,
 111                                addr,
 112                                nr_bytes);
 113 }
 114
 115 static device_callbacks const hw_core_callbacks = {
 116   { hw_core_init_address_callback, },
 117   { hw_core_attach_address_callback, },
 118   { NULL, }, /* IO */
 119   { hw_core_dma_read_buffer_callback,
 120     hw_core_dma_write_buffer_callback, },
 121   { NULL, }, /* interrupt */
 122   { generic_device_unit_decode,
 123     generic_device_unit_encode,
 124     generic_device_address_to_attach_address,
 125     generic_device_size_to_attach_size, },
 126 };
 127
 128
 129 static void *
 130 hw_core_create(const char *name,
 131                const device_unit *unit_address,
 132                const char *args)
 133 {
 134   core *memory = core_create();
 135   return memory;
 136 }
 137
 138 const device_descriptor hw_core_device_descriptor[] = {
 139   { "core", hw_core_create, &hw_core_callbacks },
 140   { NULL },
 141 };
 142
 143 #endif /* _HW_CORE_C_ */