| 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 | const char *name, |
| 63 | attach_type attach, |
| 64 | int space, |
| 65 | unsigned_word addr, |
| 66 | unsigned nr_bytes, |
| 67 | access_type access, |
| 68 | device *who) /*callback/default*/ |
| 69 | { |
| 70 | core *memory = (core*)device_data(me); |
| 71 | if (space != 0) |
| 72 | error("core_attach_address_callback() invalid address space\n"); |
| 73 | core_attach(memory, |
| 74 | attach, |
| 75 | space, |
| 76 | access, |
| 77 | addr, |
| 78 | nr_bytes, |
| 79 | who); |
| 80 | } |
| 81 | |
| 82 | |
| 83 | static unsigned |
| 84 | hw_core_dma_read_buffer_callback(device *me, |
| 85 | void *dest, |
| 86 | int space, |
| 87 | unsigned_word addr, |
| 88 | unsigned nr_bytes) |
| 89 | { |
| 90 | core *memory = (core*)device_data(me); |
| 91 | return core_map_read_buffer(core_readable(memory), |
| 92 | dest, |
| 93 | addr, |
| 94 | nr_bytes); |
| 95 | } |
| 96 | |
| 97 | |
| 98 | static unsigned |
| 99 | hw_core_dma_write_buffer_callback(device *me, |
| 100 | const void *source, |
| 101 | int space, |
| 102 | unsigned_word addr, |
| 103 | unsigned nr_bytes, |
| 104 | int violate_read_only_section) |
| 105 | { |
| 106 | core *memory = (core*)device_data(me); |
| 107 | core_map *map = (violate_read_only_section |
| 108 | ? core_readable(memory) |
| 109 | : core_writeable(memory)); |
| 110 | return core_map_write_buffer(map, |
| 111 | source, |
| 112 | addr, |
| 113 | nr_bytes); |
| 114 | } |
| 115 | |
| 116 | static device_callbacks const hw_core_callbacks = { |
| 117 | { hw_core_init_address_callback, }, |
| 118 | { hw_core_attach_address_callback, }, |
| 119 | { NULL, }, /* IO */ |
| 120 | { hw_core_dma_read_buffer_callback, |
| 121 | hw_core_dma_write_buffer_callback, }, |
| 122 | { NULL, }, /* interrupt */ |
| 123 | { generic_device_unit_decode, |
| 124 | generic_device_unit_encode, } |
| 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_ */ |