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, ®ister_callbacks }, 129 { NULL }, 130}; 131 132#endif /* _HW_REGISTER_C_ */ 133