| 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 3 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, see <http://www.gnu.org/licenses/>. |
| 17 | |
| 18 | */ |
| 19 | |
| 20 | |
| 21 | #ifndef _HW_REGISTER_C_ |
| 22 | #define _HW_REGISTER_C_ |
| 23 | |
| 24 | #include "device_table.h" |
| 25 | #include <stdlib.h> |
| 26 | #include "psim.h" |
| 27 | |
| 28 | /* DEVICE |
| 29 | |
| 30 | |
| 31 | register - dummy device to initialize processor registers |
| 32 | |
| 33 | |
| 34 | DESCRIPTION |
| 35 | |
| 36 | The properties of this device are used, during initialization, to |
| 37 | specify the initial value of various processor registers. The |
| 38 | property name specifying the register to be initialized with the |
| 39 | special form <cpu-nr>.<register> being used to initialize a |
| 40 | specific processor's register (eg 0.pc). |
| 41 | |
| 42 | Because, when the device tree is created, overriding properties are |
| 43 | entered into the tree before any default values, this device must |
| 44 | initialize registers in newest (default) to oldest (overriding) |
| 45 | property order. |
| 46 | |
| 47 | The actual registers (for a given target) are defined in the file |
| 48 | registers.c. |
| 49 | |
| 50 | This device is normally a child of the /openprom/init node. |
| 51 | |
| 52 | |
| 53 | EXAMPLES |
| 54 | |
| 55 | |
| 56 | Given a device tree containing the entry: |
| 57 | |
| 58 | | /openprom/init/register/pc 0xfff00cf0 |
| 59 | |
| 60 | then specifying the command line option: |
| 61 | |
| 62 | | -o '/openprom/init/register/pc 0x0' |
| 63 | |
| 64 | would override the initial value of processor zero's program |
| 65 | counter. The resultant device tree tree containing: |
| 66 | |
| 67 | | /openprom/init/register/0.pc 0x0 |
| 68 | | /openprom/init/register/pc 0xfff00cf0 |
| 69 | |
| 70 | and would be processed last to first resulting in the sequence: set |
| 71 | all program counters to 0xfff00cf0; set processor zero's program |
| 72 | counter to zero. |
| 73 | |
| 74 | */ |
| 75 | |
| 76 | static void |
| 77 | do_register_init(device *me, |
| 78 | const device_property *prop) |
| 79 | { |
| 80 | psim *system = device_system(me); |
| 81 | if (prop != NULL) { |
| 82 | const char *name = prop->name; |
| 83 | unsigned32 value = device_find_integer_property(me, name); |
| 84 | int processor; |
| 85 | |
| 86 | do_register_init(me, device_next_property(prop)); |
| 87 | |
| 88 | if (strchr(name, '.') == NULL) { |
| 89 | processor = -1; |
| 90 | DTRACE(register, ("%s=0x%lx\n", name, (unsigned long)value)); |
| 91 | } |
| 92 | else { |
| 93 | char *end; |
| 94 | processor = strtoul(name, &end, 0); |
| 95 | ASSERT(end[0] == '.'); |
| 96 | name = end+1; |
| 97 | DTRACE(register, ("%d.%s=0x%lx\n", processor, name, |
| 98 | (unsigned long)value)); |
| 99 | } |
| 100 | if (psim_write_register(system, processor, /* all processors */ |
| 101 | &value, |
| 102 | name, |
| 103 | cooked_transfer) <= 0) |
| 104 | error("Invalid register name %s\n", name); |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | |
| 109 | static void |
| 110 | register_init_data_callback(device *me) |
| 111 | { |
| 112 | const device_property *prop = device_find_property(me, NULL); |
| 113 | do_register_init(me, prop); |
| 114 | } |
| 115 | |
| 116 | |
| 117 | static device_callbacks const register_callbacks = { |
| 118 | { NULL, register_init_data_callback, }, |
| 119 | { NULL, }, /* address */ |
| 120 | { NULL, }, /* IO */ |
| 121 | { NULL, }, /* DMA */ |
| 122 | { NULL, }, /* interrupt */ |
| 123 | { NULL, }, /* unit */ |
| 124 | }; |
| 125 | |
| 126 | const device_descriptor hw_register_device_descriptor[] = { |
| 127 | { "register", NULL, ®ister_callbacks }, |
| 128 | { NULL }, |
| 129 | }; |
| 130 | |
| 131 | #endif /* _HW_REGISTER_C_ */ |