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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_ */ |