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