Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the libpayload project. |
| 3 | * |
| 4 | * Copyright (C) 2008 coresystems GmbH |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #include <libpayload.h> |
| 31 | #include <coreboot_tables.h> |
| 32 | |
Patrick Georgi | 5febb00 | 2012-02-02 15:51:29 +0100 | [diff] [blame^] | 33 | u8 *mem_accessor_base; |
| 34 | |
| 35 | static u8 mem_read(u8 reg) |
| 36 | { |
| 37 | return mem_accessor_base[reg]; |
| 38 | } |
| 39 | |
| 40 | static void mem_write(u8 val, u8 reg) |
| 41 | { |
| 42 | mem_accessor_base[reg] = val; |
| 43 | } |
| 44 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 45 | struct nvram_accessor *use_nvram = &(struct nvram_accessor) { |
| 46 | nvram_read, |
| 47 | nvram_write |
| 48 | }; |
| 49 | |
Patrick Georgi | 5febb00 | 2012-02-02 15:51:29 +0100 | [diff] [blame^] | 50 | struct nvram_accessor *use_mem = &(struct nvram_accessor) { |
| 51 | mem_read, |
| 52 | mem_write |
| 53 | }; |
| 54 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 55 | struct cb_cmos_option_table *get_system_option_table(void) |
| 56 | { |
| 57 | return phys_to_virt(lib_sysinfo.option_table); |
| 58 | } |
| 59 | |
| 60 | static int options_checksum_valid(const struct nvram_accessor *nvram) |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 61 | { |
| 62 | int i; |
Stefan Reinauer | 71c006f | 2008-09-26 18:39:06 +0000 | [diff] [blame] | 63 | int range_start = lib_sysinfo.cmos_range_start / 8; |
| 64 | int range_end = lib_sysinfo.cmos_range_end / 8; |
| 65 | int checksum_location = lib_sysinfo.cmos_checksum_location / 8; |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 66 | u16 checksum = 0, checksum_old; |
| 67 | |
| 68 | for(i = range_start; i <= range_end; i++) { |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 69 | checksum += nvram->read(i); |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 70 | } |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 71 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 72 | checksum_old = ((nvram->read(checksum_location)<<8) | nvram->read(checksum_location+1)); |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 73 | |
| 74 | return (checksum_old == checksum); |
| 75 | } |
| 76 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 77 | void fix_options_checksum_with(const struct nvram_accessor *nvram) |
Stefan Reinauer | 59a1b7f | 2010-08-17 10:14:50 +0000 | [diff] [blame] | 78 | { |
| 79 | int i; |
| 80 | int range_start = lib_sysinfo.cmos_range_start / 8; |
| 81 | int range_end = lib_sysinfo.cmos_range_end / 8; |
| 82 | int checksum_location = lib_sysinfo.cmos_checksum_location / 8; |
| 83 | u16 checksum = 0; |
| 84 | |
| 85 | for(i = range_start; i <= range_end; i++) { |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 86 | checksum += nvram->read(i); |
Stefan Reinauer | 59a1b7f | 2010-08-17 10:14:50 +0000 | [diff] [blame] | 87 | } |
Stefan Reinauer | 59a1b7f | 2010-08-17 10:14:50 +0000 | [diff] [blame] | 88 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 89 | nvram->write((checksum >> 8), checksum_location); |
| 90 | nvram->write((checksum & 0xff), checksum_location + 1); |
Stefan Reinauer | 59a1b7f | 2010-08-17 10:14:50 +0000 | [diff] [blame] | 91 | } |
| 92 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 93 | void fix_options_checksum(void) |
| 94 | { |
| 95 | fix_options_checksum_with(use_nvram); |
| 96 | } |
| 97 | |
| 98 | static int get_cmos_value(const struct nvram_accessor *nvram, u32 bitnum, u32 len, void *valptr) |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 99 | { |
| 100 | u8 *value = (u8 *)valptr; |
| 101 | int offs = 0; |
| 102 | u32 addr, bit; |
| 103 | u8 reg8; |
| 104 | |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 105 | /* Convert to byte borders */ |
| 106 | addr=(bitnum / 8); |
| 107 | bit=(bitnum % 8); |
| 108 | |
| 109 | /* Handle single byte or less */ |
| 110 | if(len <= 8) { |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 111 | reg8 = nvram->read(addr); |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 112 | reg8 >>= bit; |
| 113 | value[0] = reg8 & ((1 << len) -1); |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | /* When handling more than a byte, copy whole bytes */ |
| 118 | while (len > 0) { |
| 119 | len -= 8; |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 120 | value[offs++]=nvram->read(addr++); |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 121 | } |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 126 | static int set_cmos_value(const struct nvram_accessor *nvram, u32 bitnum, u32 len, void *valptr) |
Patrick Georgi | dbde809 | 2011-11-22 13:07:45 +0100 | [diff] [blame] | 127 | { |
| 128 | u8 *value = (u8 *)valptr; |
| 129 | int offs = 0; |
| 130 | u32 addr, bit; |
| 131 | u8 reg8; |
| 132 | |
| 133 | /* Convert to byte borders */ |
| 134 | addr=(bitnum / 8); |
| 135 | bit=(bitnum % 8); |
| 136 | |
| 137 | /* Handle single byte or less */ |
| 138 | if (len <= 8) { |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 139 | reg8 = nvram->read(addr); |
Patrick Georgi | dbde809 | 2011-11-22 13:07:45 +0100 | [diff] [blame] | 140 | reg8 &= ~(((1 << len) - 1) << bit); |
| 141 | reg8 |= (value[0] & ((1 << len) - 1)) << bit; |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 142 | nvram->write(reg8, addr); |
Patrick Georgi | dbde809 | 2011-11-22 13:07:45 +0100 | [diff] [blame] | 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | /* When handling more than a byte, copy whole bytes */ |
| 147 | while (len > 0) { |
| 148 | len -= 8; |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 149 | nvram->write(value[offs++], addr++); |
Patrick Georgi | dbde809 | 2011-11-22 13:07:45 +0100 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | static struct cb_cmos_entries *lookup_cmos_entry(struct cb_cmos_option_table *option_table, char *name) |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 156 | { |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 157 | struct cb_cmos_entries *cmos_entry; |
| 158 | int len = strnlen(name, CMOS_MAX_NAME_LENGTH); |
Stefan Reinauer | 14e2277 | 2010-04-27 06:56:47 +0000 | [diff] [blame] | 159 | |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 160 | /* cmos entries are located right after the option table */ |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 161 | |
| 162 | for ( cmos_entry = (struct cb_cmos_entries*)((unsigned char *)option_table + option_table->header_length); |
| 163 | cmos_entry->tag == CB_TAG_OPTION; |
| 164 | cmos_entry = (struct cb_cmos_entries*)((unsigned char *)cmos_entry + cmos_entry->size)) { |
Stefan Reinauer | 34b9f86 | 2008-08-19 17:51:30 +0000 | [diff] [blame] | 165 | if (memcmp((const char*)cmos_entry->name, name, len)) |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 166 | continue; |
Patrick Georgi | dbde809 | 2011-11-22 13:07:45 +0100 | [diff] [blame] | 167 | return cmos_entry; |
| 168 | } |
| 169 | |
| 170 | printf("ERROR: No such CMOS option (%s)\n", name); |
| 171 | return NULL; |
| 172 | } |
| 173 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 174 | int get_option_with(const struct nvram_accessor *nvram, struct cb_cmos_option_table *option_table, void *dest, char *name) |
Patrick Georgi | dbde809 | 2011-11-22 13:07:45 +0100 | [diff] [blame] | 175 | { |
| 176 | struct cb_cmos_entries *cmos_entry = lookup_cmos_entry(option_table, name); |
| 177 | if (cmos_entry) { |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 178 | if(get_cmos_value(nvram, cmos_entry->bit, cmos_entry->length, dest)) |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 179 | return 1; |
| 180 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 181 | if(!options_checksum_valid(nvram)) |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 182 | return 1; |
| 183 | |
| 184 | return 0; |
| 185 | } |
Stefan Reinauer | 95a6e1c | 2008-08-07 10:21:05 +0000 | [diff] [blame] | 186 | return 1; |
| 187 | } |
Patrick Georgi | c230058 | 2011-07-12 11:40:29 +0200 | [diff] [blame] | 188 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 189 | int get_option_from(struct cb_cmos_option_table *option_table, void *dest, char *name) |
| 190 | { |
| 191 | return get_option_with(use_nvram, option_table, dest, name); |
| 192 | } |
| 193 | |
Patrick Georgi | c230058 | 2011-07-12 11:40:29 +0200 | [diff] [blame] | 194 | int get_option(void *dest, char *name) |
| 195 | { |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 196 | return get_option_from(get_system_option_table(), dest, name); |
Patrick Georgi | c230058 | 2011-07-12 11:40:29 +0200 | [diff] [blame] | 197 | } |
Patrick Georgi | dbde809 | 2011-11-22 13:07:45 +0100 | [diff] [blame] | 198 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 199 | int set_option_with(const struct nvram_accessor *nvram, struct cb_cmos_option_table *option_table, void *value, char *name) |
Patrick Georgi | dbde809 | 2011-11-22 13:07:45 +0100 | [diff] [blame] | 200 | { |
Patrick Georgi | dbde809 | 2011-11-22 13:07:45 +0100 | [diff] [blame] | 201 | struct cb_cmos_entries *cmos_entry = lookup_cmos_entry(option_table, name); |
| 202 | if (cmos_entry) { |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 203 | set_cmos_value(nvram, cmos_entry->bit, cmos_entry->length, value); |
| 204 | fix_options_checksum_with(nvram); |
Patrick Georgi | dbde809 | 2011-11-22 13:07:45 +0100 | [diff] [blame] | 205 | return 0; |
| 206 | } |
| 207 | return 1; |
| 208 | } |
| 209 | |
Patrick Georgi | 317ca0d | 2012-01-16 10:14:24 +0100 | [diff] [blame] | 210 | int set_option(void *value, char *name) |
| 211 | { |
| 212 | return set_option_with(use_nvram, get_system_option_table(), value, name); |
| 213 | } |