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c906108c SS |
1 | /* This file is part of the program psim. |
2 | ||
601cecf0 | 3 | Copyright 1994, 1995, 1996, 2003 Andrew Cagney |
c906108c SS |
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_REGISTER_C_ | |
23 | #define _HW_REGISTER_C_ | |
24 | ||
25 | #include "device_table.h" | |
26 | #include <stdlib.h> | |
27 | #include "psim.h" | |
28 | ||
29 | /* DEVICE | |
30 | ||
31 | ||
32 | register - dummy device to initialize processor registers | |
33 | ||
34 | ||
35 | DESCRIPTION | |
36 | ||
37 | The properties of this device are used, during initialization, to | |
38 | specify the initial value of various processor registers. The | |
39 | property name specifying the register to be initialized with the | |
40 | special form <cpu-nr>.<register> being used to initialize a | |
41 | specific processor's register (eg 0.pc). | |
42 | ||
43 | Because, when the device tree is created, overriding properties are | |
44 | entered into the tree before any default values, this device must | |
45 | initialize registers in newest (default) to oldest (overriding) | |
46 | property order. | |
47 | ||
48 | The actual registers (for a given target) are defined in the file | |
49 | registers.c. | |
50 | ||
51 | This device is normally a child of the /openprom/init node. | |
52 | ||
53 | ||
54 | EXAMPLES | |
55 | ||
56 | ||
57 | Given a device tree containing the entry: | |
58 | ||
59 | | /openprom/init/register/pc 0xfff00cf0 | |
60 | ||
61 | then specifying the command line option: | |
62 | ||
63 | | -o '/openprom/init/register/pc 0x0' | |
64 | ||
65 | would override the initial value of processor zero's program | |
66 | counter. The resultant device tree tree containing: | |
67 | ||
68 | | /openprom/init/register/0.pc 0x0 | |
69 | | /openprom/init/register/pc 0xfff00cf0 | |
70 | ||
71 | and would be processed last to first resulting in the sequence: set | |
72 | all program counters to 0xfff00cf0; set processor zero's program | |
73 | counter to zero. | |
74 | ||
75 | */ | |
76 | ||
77 | static void | |
78 | do_register_init(device *me, | |
79 | const device_property *prop) | |
80 | { | |
81 | psim *system = device_system(me); | |
82 | if (prop != NULL) { | |
83 | const char *name = prop->name; | |
84 | unsigned32 value = device_find_integer_property(me, name); | |
85 | int processor; | |
86 | ||
87 | do_register_init(me, device_next_property(prop)); | |
88 | ||
89 | if (strchr(name, '.') == NULL) { | |
90 | processor = -1; | |
91 | DTRACE(register, ("%s=0x%lx\n", name, (unsigned long)value)); | |
92 | } | |
93 | else { | |
94 | char *end; | |
95 | processor = strtoul(name, &end, 0); | |
96 | ASSERT(end[0] == '.'); | |
97 | name = end+1; | |
98 | DTRACE(register, ("%d.%s=0x%lx\n", processor, name, | |
99 | (unsigned long)value)); | |
100 | } | |
601cecf0 AC |
101 | if (psim_write_register(system, processor, /* all processors */ |
102 | &value, | |
103 | name, | |
104 | cooked_transfer) <= 0) | |
105 | error("Invalid register name %s\n", name); | |
c906108c SS |
106 | } |
107 | } | |
108 | ||
109 | ||
110 | static void | |
111 | register_init_data_callback(device *me) | |
112 | { | |
113 | const device_property *prop = device_find_property(me, NULL); | |
114 | do_register_init(me, prop); | |
115 | } | |
116 | ||
117 | ||
118 | static device_callbacks const register_callbacks = { | |
119 | { NULL, register_init_data_callback, }, | |
120 | { NULL, }, /* address */ | |
121 | { NULL, }, /* IO */ | |
122 | { NULL, }, /* DMA */ | |
123 | { NULL, }, /* interrupt */ | |
124 | { NULL, }, /* unit */ | |
125 | }; | |
126 | ||
127 | const device_descriptor hw_register_device_descriptor[] = { | |
128 | { "register", NULL, ®ister_callbacks }, | |
129 | { NULL }, | |
130 | }; | |
131 | ||
50427dbf | 132 | #endif /* _HW_REGISTER_C_ */ |