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 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
77static void
78do_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    }
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);
106  }
107}
108
109
110static void
111register_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
118static 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
127const device_descriptor hw_register_device_descriptor[] = {
128  { "register", NULL, &register_callbacks },
129  { NULL },
130};
131
132#endif /* _HW_REGISTER_C_ */
133