1 /* This file is part of the program psim.
3 Copyright 1994, 1995, 1996, 2003 Andrew Cagney
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.
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.
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.
22 #ifndef _HW_REGISTER_C_
23 #define _HW_REGISTER_C_
25 #include "device_table.h"
32 register - dummy device to initialize processor registers
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).
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)
48 The actual registers (for a given target) are defined in the file
51 This device is normally a child of the /openprom/init node.
57 Given a device tree containing the entry:
59 | /openprom/init/register/pc 0xfff00cf0
61 then specifying the command line option:
63 | -o '/openprom/init/register/pc 0x0'
65 would override the initial value of processor zero's program
66 counter. The resultant device tree tree containing:
68 | /openprom/init/register/0.pc 0x0
69 | /openprom/init/register/pc 0xfff00cf0
71 and would be processed last to first resulting in the sequence: set
72 all program counters to 0xfff00cf0; set processor zero's program
78 do_register_init(device
*me
,
79 const device_property
*prop
)
81 psim
*system
= device_system(me
);
83 const char *name
= prop
->name
;
84 unsigned32 value
= device_find_integer_property(me
, name
);
87 do_register_init(me
, device_next_property(prop
));
89 if (strchr(name
, '.') == NULL
) {
91 DTRACE(register, ("%s=0x%lx\n", name
, (unsigned long)value
));
95 processor
= strtoul(name
, &end
, 0);
96 ASSERT(end
[0] == '.');
98 DTRACE(register, ("%d.%s=0x%lx\n", processor
, name
,
99 (unsigned long)value
));
101 if (psim_write_register(system
, processor
, /* all processors */
104 cooked_transfer
) <= 0)
105 error("Invalid register name %s\n", name
);
111 register_init_data_callback(device
*me
)
113 const device_property
*prop
= device_find_property(me
, NULL
);
114 do_register_init(me
, prop
);
118 static device_callbacks
const register_callbacks
= {
119 { NULL
, register_init_data_callback
, },
120 { NULL
, }, /* address */
123 { NULL
, }, /* interrupt */
124 { NULL
, }, /* unit */
127 const device_descriptor hw_register_device_descriptor
[] = {
128 { "register", NULL
, ®ister_callbacks
},
132 #endif /* _HW_REGISTER_C_ */