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 3 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, see <http://www.gnu.org/licenses/>.
  17
  18     */
  19
  20
  21 #ifndef _HW_CORE_C_
  22 #define _HW_CORE_C_
  23
  24 #include "device_table.h"
  25
  26 #include "corefile.h"
  27
  28
  29 /* DEVICE
  30
  31    core - root of the device tree
  32
  33    DESCRIPTION
  34
  35    The core device positioned at the root of the device tree appears
  36    to its child devices as a normal device just like every other
  37    device in the tree.
  38
  39    Internally it is implemented using a core object.  Requests to
  40    attach (or detach) address spaces are passed to that core object.
  41    Requests to transfer (DMA) data are reflected back down the device
  42    tree using the core_map data transfer methods.
  43
  44    PROPERTIES
  45
  46    None.
  47
  48    */
  49
  50
  51 static void
  52 hw_core_init_address_callback(device *me)
  53 {
  54   core *memory = (core*)device_data(me);
  55   core_init(memory);
  56 }
  57
  58
  59 static void
  60 hw_core_attach_address_callback(device *me,
  61                                 attach_type attach,
  62                                 int space,
  63                                 unsigned_word addr,
  64                                 unsigned nr_bytes,
  65                                 access_type access,
  66                                 device *client) /*callback/default*/
  67 {
  68   core *memory = (core*)device_data(me);
  69   if (space != 0)
  70     error("core_attach_address_callback() invalid address space\n");
  71   core_attach(memory,
  72               attach,
  73               space,
  74               access,
  75               addr,
  76               nr_bytes,
  77               client);
  78 }
  79
  80
  81 static unsigned
  82 hw_core_dma_read_buffer_callback(device *me,
  83                                  void *dest,
  84                                  int space,
  85                                  unsigned_word addr,
  86                                  unsigned nr_bytes)
  87 {
  88   core *memory = (core*)device_data(me);
  89   return core_map_read_buffer(core_readable(memory),
  90                               dest,
  91                               addr,
  92                               nr_bytes);
  93 }
  94
  95
  96 static unsigned
  97 hw_core_dma_write_buffer_callback(device *me,
  98                                   const void *source,
  99                                   int space,
 100                                   unsigned_word addr,
 101                                   unsigned nr_bytes,
 102                                   int violate_read_only_section)
 103 {
 104   core *memory = (core*)device_data(me);
 105   core_map *map = (violate_read_only_section
 106                    ? core_readable(memory)
 107                    : core_writeable(memory));
 108   return core_map_write_buffer(map,
 109                                source,
 110                                addr,
 111                                nr_bytes);
 112 }
 113
 114 static device_callbacks const hw_core_callbacks = {
 115   { hw_core_init_address_callback, },
 116   { hw_core_attach_address_callback, },
 117   { NULL, }, /* IO */
 118   { hw_core_dma_read_buffer_callback,
 119     hw_core_dma_write_buffer_callback, },
 120   { NULL, }, /* interrupt */
 121   { generic_device_unit_decode,
 122     generic_device_unit_encode,
 123     generic_device_address_to_attach_address,
 124     generic_device_size_to_attach_size, },
 125 };
 126
 127
 128 static void *
 129 hw_core_create(const char *name,
 130                const device_unit *unit_address,
 131                const char *args)
 132 {
 133   core *memory = core_create();
 134   return memory;
 135 }
 136
 137 const device_descriptor hw_core_device_descriptor[] = {
 138   { "core", hw_core_create, &hw_core_callbacks },
 139   { NULL },
 140 };
 141
 142 #endif /* _HW_CORE_C_ */