Patrick Georgi | 55189c9 | 2020-05-10 20:09:31 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 2 | |
| 3 | #include "common.h" |
| 4 | #include "layout.h" |
| 5 | #include "cmos_lowlevel.h" |
| 6 | |
| 7 | typedef struct cmos_entry_item_t cmos_entry_item_t; |
| 8 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 9 | struct cmos_entry_item_t { |
| 10 | cmos_entry_t item; |
| 11 | cmos_entry_item_t *next; |
| 12 | }; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 13 | |
| 14 | typedef struct cmos_enum_item_t cmos_enum_item_t; |
| 15 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 16 | struct cmos_enum_item_t { |
| 17 | cmos_enum_t item; |
| 18 | cmos_enum_item_t *next; |
| 19 | }; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 20 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 21 | static void default_cmos_layout_get_fn(void); |
| 22 | static int areas_overlap(unsigned area_0_start, unsigned area_0_length, |
| 23 | unsigned area_1_start, unsigned area_1_length); |
| 24 | static int entries_overlap(const cmos_entry_t * p, const cmos_entry_t * q); |
| 25 | static const cmos_enum_item_t *find_first_cmos_enum_id(unsigned config_id); |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 26 | |
| 27 | const char checksum_param_name[] = "check_sum"; |
| 28 | |
Stefan Reinauer | f527e70 | 2008-01-18 15:33:49 +0000 | [diff] [blame] | 29 | /* Newer versions of coreboot store the 3 pieces of information below in the |
| 30 | * coreboot table so we don't have to rely on hardcoded values. |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 31 | */ |
| 32 | |
| 33 | /* This is the offset from the start of CMOS of the first byte that the |
| 34 | * checksum is calculated over. |
| 35 | */ |
| 36 | #define CMOS_CHECKSUM_START 49 |
| 37 | |
| 38 | /* This is the offset from the start of CMOS of the last byte that the |
| 39 | * checksum is calculated over. |
| 40 | */ |
| 41 | #define CMOS_CHECKSUM_END 125 |
| 42 | |
Stefan Reinauer | f527e70 | 2008-01-18 15:33:49 +0000 | [diff] [blame] | 43 | /* This is the offset from the start of CMOS where the coreboot checksum is |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 44 | * stored. |
| 45 | */ |
| 46 | #define CMOS_CHECKSUM_INDEX 126 |
| 47 | |
| 48 | /* index of first byte of checksummed area */ |
| 49 | unsigned cmos_checksum_start = CMOS_CHECKSUM_START; |
| 50 | |
| 51 | /* index of last byte of checksummed area */ |
| 52 | unsigned cmos_checksum_end = CMOS_CHECKSUM_END; |
| 53 | |
| 54 | /* index of first byte of CMOS checksum (a big-endian 16-bit value) */ |
| 55 | unsigned cmos_checksum_index = CMOS_CHECKSUM_INDEX; |
| 56 | |
| 57 | /* List is sorted in ascending order according to 'bit' field in |
| 58 | * cmos_entry_t. |
| 59 | */ |
| 60 | static cmos_entry_item_t *cmos_entry_list = NULL; |
| 61 | |
| 62 | /* List is sorted in ascending order: first by 'config_id' and then by |
| 63 | * 'value'. |
| 64 | */ |
| 65 | static cmos_enum_item_t *cmos_enum_list = NULL; |
| 66 | |
| 67 | static cmos_layout_get_fn_t cmos_layout_get_fn = default_cmos_layout_get_fn; |
| 68 | |
| 69 | /**************************************************************************** |
| 70 | * entries_overlap |
| 71 | * |
Elyes HAOUAS | 2119d0b | 2020-02-16 10:01:33 +0100 | [diff] [blame] | 72 | * Return 1 if CMOS entries 'p' and 'q' overlap. Else return 0. |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 73 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 74 | static inline int entries_overlap(const cmos_entry_t * p, |
| 75 | const cmos_entry_t * q) |
| 76 | { |
| 77 | return areas_overlap(p->bit, p->length, q->bit, q->length); |
| 78 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 79 | |
| 80 | /**************************************************************************** |
| 81 | * cmos_entry_to_const_item |
| 82 | * |
| 83 | * Return a pointer to the cmos_entry_item_t that 'p' is embedded within. |
| 84 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 85 | static inline const cmos_entry_item_t *cmos_entry_to_const_item |
| 86 | (const cmos_entry_t * p) { |
| 87 | static const cmos_entry_t *pos = &((cmos_entry_item_t *) 0)->item; |
| 88 | unsigned long offset, address; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 89 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 90 | offset = (unsigned long)pos; |
| 91 | address = ((unsigned long)p) - offset; |
| 92 | return (const cmos_entry_item_t *)address; |
| 93 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 94 | |
| 95 | /**************************************************************************** |
| 96 | * cmos_enum_to_const_item |
| 97 | * |
| 98 | * Return a pointer to the cmos_enum_item_t that 'p' is embedded within. |
| 99 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 100 | static inline const cmos_enum_item_t *cmos_enum_to_const_item |
| 101 | (const cmos_enum_t * p) { |
| 102 | static const cmos_enum_t *pos = &((cmos_enum_item_t *) 0)->item; |
| 103 | unsigned long offset, address; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 104 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 105 | offset = (unsigned long)pos; |
| 106 | address = ((unsigned long)p) - offset; |
| 107 | return (const cmos_enum_item_t *)address; |
| 108 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 109 | |
| 110 | /**************************************************************************** |
| 111 | * register_cmos_layout_get_fn |
| 112 | * |
| 113 | * Set 'fn' as the function that will be called to retrieve CMOS layout |
| 114 | * information. |
| 115 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 116 | void register_cmos_layout_get_fn(cmos_layout_get_fn_t fn) |
| 117 | { |
| 118 | cmos_layout_get_fn = fn; |
| 119 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 120 | |
| 121 | /**************************************************************************** |
| 122 | * get_cmos_layout |
| 123 | * |
| 124 | * Retrieve CMOS layout information and store it in our internal repository. |
| 125 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 126 | void get_cmos_layout(void) |
| 127 | { |
| 128 | cmos_layout_get_fn(); |
| 129 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 130 | |
| 131 | /**************************************************************************** |
| 132 | * add_cmos_entry |
| 133 | * |
| 134 | * Attempt to add CMOS entry 'e' to our internal repository of layout |
| 135 | * information. Return OK on success or an error code on failure. If |
| 136 | * operation fails because 'e' overlaps an existing CMOS entry, '*conflict' |
| 137 | * will be set to point to the overlapping entry. |
| 138 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 139 | int add_cmos_entry(const cmos_entry_t * e, const cmos_entry_t ** conflict) |
| 140 | { |
| 141 | cmos_entry_item_t *item, *prev, *new_entry; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 142 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 143 | *conflict = NULL; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 144 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 145 | if (e->length < 1) |
| 146 | return LAYOUT_ENTRY_BAD_LENGTH; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 147 | |
Nico Huber | 3af6985 | 2017-01-26 23:22:46 +0100 | [diff] [blame] | 148 | if (e->bit % 8 && e->bit / 8 != (e->bit + e->length - 1) / 8) |
| 149 | return LAYOUT_MULTIBYTE_ENTRY_NOT_ALIGNED; |
| 150 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 151 | if ((new_entry = |
| 152 | (cmos_entry_item_t *) malloc(sizeof(*new_entry))) == NULL) |
| 153 | out_of_memory(); |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 154 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 155 | new_entry->item = *e; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 156 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 157 | if (cmos_entry_list == NULL) { |
| 158 | new_entry->next = NULL; |
| 159 | cmos_entry_list = new_entry; |
| 160 | return OK; |
| 161 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 162 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 163 | /* Find place in list to insert new entry. List is sorted in ascending |
| 164 | * order. |
| 165 | */ |
| 166 | for (item = cmos_entry_list, prev = NULL; |
| 167 | (item != NULL) && (item->item.bit < e->bit); |
| 168 | prev = item, item = item->next) ; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 169 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 170 | if (prev == NULL) { |
| 171 | if (entries_overlap(e, &cmos_entry_list->item)) { |
| 172 | *conflict = &cmos_entry_list->item; |
| 173 | goto fail; |
| 174 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 175 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 176 | new_entry->next = cmos_entry_list; |
| 177 | cmos_entry_list = new_entry; |
| 178 | return OK; |
| 179 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 180 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 181 | if (entries_overlap(&prev->item, e)) { |
| 182 | *conflict = &prev->item; |
| 183 | goto fail; |
| 184 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 185 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 186 | if ((item != NULL) && entries_overlap(e, &item->item)) { |
| 187 | *conflict = &item->item; |
| 188 | goto fail; |
| 189 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 190 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 191 | new_entry->next = item; |
| 192 | prev->next = new_entry; |
| 193 | return OK; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 194 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 195 | fail: |
| 196 | free(new_entry); |
| 197 | return LAYOUT_ENTRY_OVERLAP; |
| 198 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 199 | |
| 200 | /**************************************************************************** |
| 201 | * find_cmos_entry |
| 202 | * |
| 203 | * Search for a CMOS entry whose name is 'name'. Return pointer to matching |
| 204 | * entry or NULL if entry not found. |
| 205 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 206 | const cmos_entry_t *find_cmos_entry(const char name[]) |
| 207 | { |
| 208 | cmos_entry_item_t *item; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 209 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 210 | for (item = cmos_entry_list; item != NULL; item = item->next) { |
| 211 | if (!strcmp(item->item.name, name)) |
| 212 | return &item->item; |
| 213 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 214 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 215 | return NULL; |
| 216 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 217 | |
| 218 | /**************************************************************************** |
| 219 | * first_cmos_entry |
| 220 | * |
| 221 | * Return a pointer to the first CMOS entry in our list or NULL if list is |
| 222 | * empty. |
| 223 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 224 | const cmos_entry_t *first_cmos_entry(void) |
| 225 | { |
| 226 | return (cmos_entry_list == NULL) ? NULL : &cmos_entry_list->item; |
| 227 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 228 | |
| 229 | /**************************************************************************** |
| 230 | * next_cmos_entry |
| 231 | * |
| 232 | * Return a pointer to next entry in list after 'last' or NULL if no more |
| 233 | * entries. |
| 234 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 235 | const cmos_entry_t *next_cmos_entry(const cmos_entry_t * last) |
| 236 | { |
| 237 | const cmos_entry_item_t *last_item, *next_item; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 238 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 239 | last_item = cmos_entry_to_const_item(last); |
| 240 | next_item = last_item->next; |
| 241 | return (next_item == NULL) ? NULL : &next_item->item; |
| 242 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 243 | |
| 244 | /**************************************************************************** |
| 245 | * add_cmos_enum |
| 246 | * |
| 247 | * Attempt to add CMOS enum 'e' to our internal repository of layout |
| 248 | * information. Return OK on success or an error code on failure. |
| 249 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 250 | int add_cmos_enum(const cmos_enum_t * e) |
| 251 | { |
| 252 | cmos_enum_item_t *item, *prev, *new_enum; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 253 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 254 | if ((new_enum = (cmos_enum_item_t *) malloc(sizeof(*new_enum))) == NULL) |
| 255 | out_of_memory(); |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 256 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 257 | new_enum->item = *e; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 258 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 259 | if (cmos_enum_list == NULL) { |
| 260 | new_enum->next = NULL; |
| 261 | cmos_enum_list = new_enum; |
| 262 | return OK; |
| 263 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 264 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 265 | /* The list of enums is sorted in ascending order, first by |
| 266 | * 'config_id' and then by 'value'. Look for the first enum |
| 267 | * whose 'config_id' field matches 'e'. |
| 268 | */ |
| 269 | for (item = cmos_enum_list, prev = NULL; |
| 270 | (item != NULL) && (item->item.config_id < e->config_id); |
| 271 | prev = item, item = item->next) ; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 272 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 273 | if (item == NULL) { |
| 274 | new_enum->next = NULL; |
| 275 | prev->next = new_enum; |
| 276 | return OK; |
| 277 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 278 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 279 | if (item->item.config_id > e->config_id) { |
| 280 | new_enum->next = item; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 281 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 282 | if (prev == NULL) |
| 283 | cmos_enum_list = new_enum; |
| 284 | else |
| 285 | prev->next = new_enum; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 286 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 287 | return OK; |
| 288 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 289 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 290 | /* List already contains at least one enum whose 'config_id' |
| 291 | * matches 'e'. Now find proper place to insert 'e' based on |
| 292 | * 'value'. |
| 293 | */ |
| 294 | while (item->item.value < e->value) { |
| 295 | prev = item; |
| 296 | item = item->next; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 297 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 298 | if ((item == NULL) || (item->item.config_id != e->config_id)) { |
| 299 | new_enum->next = item; |
| 300 | prev->next = new_enum; |
| 301 | return OK; |
| 302 | } |
| 303 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 304 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 305 | if (item->item.value == e->value) { |
| 306 | free(new_enum); |
| 307 | return LAYOUT_DUPLICATE_ENUM; |
| 308 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 309 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 310 | new_enum->next = item; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 311 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 312 | if (prev == NULL) |
| 313 | cmos_enum_list = new_enum; |
| 314 | else |
| 315 | prev->next = new_enum; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 316 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 317 | return OK; |
| 318 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 319 | |
| 320 | /**************************************************************************** |
| 321 | * find_cmos_enum |
| 322 | * |
| 323 | * Search for an enum that matches 'config_id' and 'value'. If found, return |
| 324 | * a pointer to the mathcing enum. Else return NULL. |
| 325 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 326 | const cmos_enum_t *find_cmos_enum(unsigned config_id, unsigned long long value) |
| 327 | { |
| 328 | const cmos_enum_item_t *item; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 329 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 330 | if ((item = find_first_cmos_enum_id(config_id)) == NULL) |
| 331 | return NULL; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 332 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 333 | while (item->item.value < value) { |
| 334 | item = item->next; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 335 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 336 | if ((item == NULL) || (item->item.config_id != config_id)) |
| 337 | return NULL; |
| 338 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 339 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 340 | return (item->item.value == value) ? &item->item : NULL; |
| 341 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 342 | |
| 343 | /**************************************************************************** |
| 344 | * first_cmos_enum |
| 345 | * |
| 346 | * Return a pointer to the first CMOS enum in our list or NULL if list is |
| 347 | * empty. |
| 348 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 349 | const cmos_enum_t *first_cmos_enum(void) |
| 350 | { |
| 351 | return (cmos_enum_list == NULL) ? NULL : &cmos_enum_list->item; |
| 352 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 353 | |
| 354 | /**************************************************************************** |
| 355 | * next_cmos_enum |
| 356 | * |
| 357 | * Return a pointer to next enum in list after 'last' or NULL if no more |
| 358 | * enums. |
| 359 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 360 | const cmos_enum_t *next_cmos_enum(const cmos_enum_t * last) |
| 361 | { |
| 362 | const cmos_enum_item_t *last_item, *next_item; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 363 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 364 | last_item = cmos_enum_to_const_item(last); |
| 365 | next_item = last_item->next; |
| 366 | return (next_item == NULL) ? NULL : &next_item->item; |
| 367 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 368 | |
| 369 | /**************************************************************************** |
| 370 | * first_cmos_enum_id |
| 371 | * |
| 372 | * Return a pointer to the first CMOS enum in our list that matches |
| 373 | * 'config_id' or NULL if there are no matching enums. |
| 374 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 375 | const cmos_enum_t *first_cmos_enum_id(unsigned config_id) |
| 376 | { |
| 377 | const cmos_enum_item_t *item; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 378 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 379 | item = find_first_cmos_enum_id(config_id); |
| 380 | return (item == NULL) ? NULL : &item->item; |
| 381 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 382 | |
| 383 | /**************************************************************************** |
| 384 | * next_cmos_enum_id |
| 385 | * |
| 386 | * Return a pointer to next enum in list after 'last' that matches the |
| 387 | * 'config_id' field of 'last' or NULL if there are no more matching enums. |
| 388 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 389 | const cmos_enum_t *next_cmos_enum_id(const cmos_enum_t * last) |
| 390 | { |
| 391 | const cmos_enum_item_t *item; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 392 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 393 | item = cmos_enum_to_const_item(last)->next; |
| 394 | return ((item == NULL) || (item->item.config_id != last->config_id)) ? |
| 395 | NULL : &item->item; |
| 396 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 397 | |
| 398 | /**************************************************************************** |
| 399 | * is_checksum_name |
| 400 | * |
| 401 | * Return 1 if 'name' matches the name of the parameter representing the CMOS |
| 402 | * checksum. Else return 0. |
| 403 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 404 | int is_checksum_name(const char name[]) |
| 405 | { |
| 406 | return !strcmp(name, checksum_param_name); |
| 407 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 408 | |
| 409 | /**************************************************************************** |
| 410 | * checksum_layout_to_bytes |
| 411 | * |
| 412 | * On entry, '*layout' contains checksum-related layout information expressed |
| 413 | * in bits. Perform sanity checking on the information and convert it from |
| 414 | * bit positions to byte positions. Return OK on success or an error code if |
| 415 | * a sanity check fails. |
| 416 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 417 | int checksum_layout_to_bytes(cmos_checksum_layout_t * layout) |
| 418 | { |
| 419 | unsigned start, end, index; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 420 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 421 | start = layout->summed_area_start; |
| 422 | end = layout->summed_area_end; |
| 423 | index = layout->checksum_at; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 424 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 425 | if (start % 8) |
| 426 | return LAYOUT_SUMMED_AREA_START_NOT_ALIGNED; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 427 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 428 | if ((end % 8) != 7) |
| 429 | return LAYOUT_SUMMED_AREA_END_NOT_ALIGNED; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 430 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 431 | if (index % 8) |
| 432 | return LAYOUT_CHECKSUM_LOCATION_NOT_ALIGNED; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 433 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 434 | if (end <= start) |
| 435 | return LAYOUT_INVALID_SUMMED_AREA; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 436 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 437 | /* Convert bit positions to byte positions. */ |
| 438 | start /= 8; |
| 439 | end /= 8; /* equivalent to "end = ((end - 7) / 8)" */ |
| 440 | index /= 8; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 441 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 442 | if (verify_cmos_byte_index(start) || verify_cmos_byte_index(end)) |
| 443 | return LAYOUT_SUMMED_AREA_OUT_OF_RANGE; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 444 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 445 | if (verify_cmos_byte_index(index)) |
| 446 | return LAYOUT_CHECKSUM_LOCATION_OUT_OF_RANGE; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 447 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 448 | /* checksum occupies 16 bits */ |
| 449 | if (areas_overlap(start, end - start + 1, index, index + 1)) |
| 450 | return LAYOUT_CHECKSUM_OVERLAPS_SUMMED_AREA; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 451 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 452 | layout->summed_area_start = start; |
| 453 | layout->summed_area_end = end; |
| 454 | layout->checksum_at = index; |
| 455 | return OK; |
| 456 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 457 | |
| 458 | /**************************************************************************** |
| 459 | * checksum_layout_to_bits |
| 460 | * |
| 461 | * On entry, '*layout' contains checksum-related layout information expressed |
| 462 | * in bytes. Convert this information to bit positions. |
| 463 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 464 | void checksum_layout_to_bits(cmos_checksum_layout_t * layout) |
| 465 | { |
| 466 | layout->summed_area_start *= 8; |
| 467 | layout->summed_area_end = (layout->summed_area_end * 8) + 7; |
| 468 | layout->checksum_at *= 8; |
| 469 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 470 | |
| 471 | /**************************************************************************** |
| 472 | * default_cmos_layout_get_fn |
| 473 | * |
| 474 | * If this function is ever called, it means that an appropriate callback for |
| 475 | * obtaining CMOS layout information was not set before attempting to |
| 476 | * retrieve layout information. |
| 477 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 478 | static void default_cmos_layout_get_fn(void) |
| 479 | { |
| 480 | BUG(); |
| 481 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 482 | |
| 483 | /**************************************************************************** |
| 484 | * areas_overlap |
| 485 | * |
| 486 | * Return 1 if the two given areas overlap. Else return 0. |
| 487 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 488 | static int areas_overlap(unsigned area_0_start, unsigned area_0_length, |
| 489 | unsigned area_1_start, unsigned area_1_length) |
| 490 | { |
| 491 | unsigned area_0_end, area_1_end; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 492 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 493 | area_0_end = area_0_start + area_0_length - 1; |
| 494 | area_1_end = area_1_start + area_1_length - 1; |
| 495 | return ((area_1_start <= area_0_end) && (area_0_start <= area_1_end)); |
| 496 | } |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 497 | |
| 498 | /**************************************************************************** |
| 499 | * find_first_cmos_enum_id |
| 500 | * |
| 501 | * Return a pointer to the first item in our list of enums that matches |
| 502 | * 'config_id'. Return NULL if there is no matching enum. |
| 503 | ****************************************************************************/ |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 504 | static const cmos_enum_item_t *find_first_cmos_enum_id(unsigned config_id) |
| 505 | { |
| 506 | cmos_enum_item_t *item; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 507 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 508 | for (item = cmos_enum_list; |
| 509 | (item != NULL) && (item->item.config_id < config_id); |
| 510 | item = item->next) ; |
Stefan Reinauer | 6540ae5 | 2007-07-12 16:35:42 +0000 | [diff] [blame] | 511 | |
Stefan Reinauer | 90b96b6 | 2010-01-13 21:00:23 +0000 | [diff] [blame] | 512 | return ((item == NULL) || (item->item.config_id > config_id)) ? |
| 513 | NULL : item; |
| 514 | } |