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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [sim/] [ppc/] [hw_register.c] - Blame information for rev 157

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1 24 jeremybenn
/*  This file is part of the program psim.
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    Copyright 1994, 1995, 1996, 2003 Andrew Cagney
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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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    if (psim_write_register(system, processor, /* all processors */
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                            &value,
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                            name,
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                            cooked_transfer) <= 0)
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      error("Invalid register name %s\n", name);
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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, &register_callbacks },
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  { NULL },
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};
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#endif /* _HW_REGISTER_C_ */

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