132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _HW_REGISTER_C_
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#define _HW_REGISTER_C_
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#include "device_table.h"
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#include <stdlib.h>
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#include "psim.h"
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/* DEVICE
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register - dummy device to initialize processor registers
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DESCRIPTION
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The properties of this device are used, during initialization, to
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specify the initial value of various processor registers. The
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property name specifying the register to be initialized with the
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special form <cpu-nr>.<register> being used to initialize a
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specific processor's register (eg 0.pc).
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Because, when the device tree is created, overriding properties are
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entered into the tree before any default values, this device must
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initialize registers in newest (default) to oldest (overriding)
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property order.
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The actual registers (for a given target) are defined in the file
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registers.c.
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This device is normally a child of the /openprom/init node.
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EXAMPLES
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Given a device tree containing the entry:
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| /openprom/init/register/pc 0xfff00cf0
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then specifying the command line option:
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| -o '/openprom/init/register/pc 0x0'
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would override the initial value of processor zero's program
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counter. The resultant device tree tree containing:
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| /openprom/init/register/0.pc 0x0
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| /openprom/init/register/pc 0xfff00cf0
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and would be processed last to first resulting in the sequence: set
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all program counters to 0xfff00cf0; set processor zero's program
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counter to zero.
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*/
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static void
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do_register_init(device *me,
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const device_property *prop)
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{
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psim *system = device_system(me);
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if (prop != NULL) {
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const char *name = prop->name;
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unsigned32 value = device_find_integer_property(me, name);
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int processor;
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do_register_init(me, device_next_property(prop));
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if (strchr(name, '.') == NULL) {
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processor = -1;
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DTRACE(register, ("%s=0x%lx\n", name, (unsigned long)value));
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}
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else {
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char *end;
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processor = strtoul(name, &end, 0);
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ASSERT(end[0] == '.');
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name = end+1;
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DTRACE(register, ("%d.%s=0x%lx\n", processor, name,
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(unsigned long)value));
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}
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psim_write_register(system, processor, /* all processors */
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&value,
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name,
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cooked_transfer);
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}
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}
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static void
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register_init_data_callback(device *me)
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{
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const device_property *prop = device_find_property(me, NULL);
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do_register_init(me, prop);
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}
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static device_callbacks const register_callbacks = {
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{ NULL, register_init_data_callback, },
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{ NULL, }, /* address */
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{ NULL, }, /* IO */
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{ NULL, }, /* DMA */
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{ NULL, }, /* interrupt */
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{ NULL, }, /* unit */
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};
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const device_descriptor hw_register_device_descriptor[] = {
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{ "register", NULL, ®ister_callbacks },
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{ NULL },
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};
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#endif _HW_REGISTER_C_
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