sim/common/dv-core.c

   1 /* The common simulator framework for GDB, the GNU Debugger.
   2
   3    Copyright 2002-2019 Free Software Foundation, Inc.
   4
   5    Contributed by Andrew Cagney and Red Hat.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22
  23 #include "sim-main.h"
  24 #include "hw-main.h"
  25
  26 /* DEVICE
  27
  28    core - root of the device tree
  29
  30    DESCRIPTION
  31
  32    The core device, positioned at the root of the device tree appears
  33    to its child devices as a normal device just like every other
  34    device in the tree.
  35
  36    Internally it is implemented using a core object.  Requests to
  37    attach (or detach) address spaces are passed to that core object.
  38    Requests to transfer (DMA) data are reflected back down the device
  39    tree using the core_map data transfer methods.
  40
  41    PROPERTIES
  42
  43    None.
  44
  45    */
  46
  47
  48 static void
  49 dv_core_attach_address_callback (struct hw *me,
  50                                  int level,
  51                                  int space,
  52                                  address_word addr,
  53                                  address_word nr_bytes,
  54                                  struct hw *client)
  55 {
  56   HW_TRACE ((me, "attach - level=%d, space=%d, addr=0x%lx, nr_bytes=%ld, client=%s",
  57              level, space, (unsigned long) addr, (unsigned long) nr_bytes, hw_path (client)));
  58   /* NOTE: At preset the space is assumed to be zero.  Perhaphs the
  59      space should be mapped onto something for instance: space0 -
  60      unified memory; space1 - IO memory; ... */
  61   sim_core_attach (hw_system (me),
  62                    NULL, /*cpu*/
  63                    level,
  64                    access_read_write_exec,
  65                    space, addr,
  66                    nr_bytes,
  67                    0, /* modulo */
  68                    client,
  69                    NULL);
  70 }
  71
  72
  73 static unsigned
  74 dv_core_dma_read_buffer_callback (struct hw *me,
  75                                   void *dest,
  76                                   int space,
  77                                   unsigned_word addr,
  78                                   unsigned nr_bytes)
  79 {
  80   return sim_core_read_buffer (hw_system (me),
  81                                NULL, /*CPU*/
  82                                space, /*???*/
  83                                dest,
  84                                addr,
  85                                nr_bytes);
  86 }
  87
  88
  89 static unsigned
  90 dv_core_dma_write_buffer_callback (struct hw *me,
  91                                    const void *source,
  92                                    int space,
  93                                    unsigned_word addr,
  94                                    unsigned nr_bytes,
  95                                    int violate_read_only_section)
  96 {
  97   return sim_core_write_buffer (hw_system (me),
  98                                 NULL, /*cpu*/
  99                                 space, /*???*/
 100                                 source,
 101                                 addr,
 102                                 nr_bytes);
 103 }
 104
 105
 106 static void
 107 dv_core_finish (struct hw *me)
 108 {
 109   set_hw_attach_address (me, dv_core_attach_address_callback);
 110   set_hw_dma_write_buffer (me, dv_core_dma_write_buffer_callback);
 111   set_hw_dma_read_buffer (me, dv_core_dma_read_buffer_callback);
 112 }
 113
 114 const struct hw_descriptor dv_core_descriptor[] = {
 115   { "core", dv_core_finish, },
 116   { NULL, NULL },
 117 };