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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [sim/] [ppc/] [hw_register.c] - Rev 285
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/* 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 2 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #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_ */
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