1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* This file is part of the program psim.
Copyright 1994, 1995, 1996, 2003 Andrew Cagney
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _HW_REGISTER_C_
#define _HW_REGISTER_C_
#include "device_table.h"
#include <stdlib.h>
#include "psim.h"
/* DEVICE
register - dummy device to initialize processor registers
DESCRIPTION
The properties of this device are used, during initialization, to
specify the initial value of various processor registers. The
property name specifying the register to be initialized with the
special form <cpu-nr>.<register> being used to initialize a
specific processor's register (eg 0.pc).
Because, when the device tree is created, overriding properties are
entered into the tree before any default values, this device must
initialize registers in newest (default) to oldest (overriding)
property order.
The actual registers (for a given target) are defined in the file
registers.c.
This device is normally a child of the /openprom/init node.
EXAMPLES
Given a device tree containing the entry:
| /openprom/init/register/pc 0xfff00cf0
then specifying the command line option:
| -o '/openprom/init/register/pc 0x0'
would override the initial value of processor zero's program
counter. The resultant device tree tree containing:
| /openprom/init/register/0.pc 0x0
| /openprom/init/register/pc 0xfff00cf0
and would be processed last to first resulting in the sequence: set
all program counters to 0xfff00cf0; set processor zero's program
counter to zero.
*/
static void
do_register_init(device *me,
const device_property *prop)
{
psim *system = device_system(me);
if (prop != NULL) {
const char *name = prop->name;
unsigned32 value = device_find_integer_property(me, name);
int processor;
do_register_init(me, device_next_property(prop));
if (strchr(name, '.') == NULL) {
processor = -1;
DTRACE(register, ("%s=0x%lx\n", name, (unsigned long)value));
}
else {
char *end;
processor = strtoul(name, &end, 0);
ASSERT(end[0] == '.');
name = end+1;
DTRACE(register, ("%d.%s=0x%lx\n", processor, name,
(unsigned long)value));
}
if (psim_write_register(system, processor, /* all processors */
&value,
name,
cooked_transfer) <= 0)
error("Invalid register name %s\n", name);
}
}
static void
register_init_data_callback(device *me)
{
const device_property *prop = device_find_property(me, NULL);
do_register_init(me, prop);
}
static device_callbacks const register_callbacks = {
{ NULL, register_init_data_callback, },
{ NULL, }, /* address */
{ NULL, }, /* IO */
{ NULL, }, /* DMA */
{ NULL, }, /* interrupt */
{ NULL, }, /* unit */
};
const device_descriptor hw_register_device_descriptor[] = {
{ "register", NULL, ®ister_callbacks },
{ NULL },
};
#endif /* _HW_REGISTER_C_ */
|
