Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 1 | /* sfi_core.c Simple Firmware Interface - core internals */ |
| 2 | |
| 3 | /* |
| 4 | |
| 5 | This file is provided under a dual BSD/GPLv2 license. When using or |
| 6 | redistributing this file, you may do so under either license. |
| 7 | |
| 8 | GPL LICENSE SUMMARY |
| 9 | |
| 10 | Copyright(c) 2009 Intel Corporation. All rights reserved. |
| 11 | |
| 12 | This program is free software; you can redistribute it and/or modify |
| 13 | it under the terms of version 2 of the GNU General Public License as |
| 14 | published by the Free Software Foundation. |
| 15 | |
| 16 | This program is distributed in the hope that it will be useful, but |
| 17 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 19 | General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License |
| 22 | along with this program; if not, write to the Free Software |
| 23 | Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| 24 | The full GNU General Public License is included in this distribution |
| 25 | in the file called LICENSE.GPL. |
| 26 | |
| 27 | BSD LICENSE |
| 28 | |
| 29 | Copyright(c) 2009 Intel Corporation. All rights reserved. |
| 30 | |
| 31 | Redistribution and use in source and binary forms, with or without |
| 32 | modification, are permitted provided that the following conditions |
| 33 | are met: |
| 34 | |
| 35 | * Redistributions of source code must retain the above copyright |
| 36 | notice, this list of conditions and the following disclaimer. |
| 37 | * Redistributions in binary form must reproduce the above copyright |
| 38 | notice, this list of conditions and the following disclaimer in |
| 39 | the documentation and/or other materials provided with the |
| 40 | distribution. |
| 41 | * Neither the name of Intel Corporation nor the names of its |
| 42 | contributors may be used to endorse or promote products derived |
| 43 | from this software without specific prior written permission. |
| 44 | |
| 45 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 46 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 47 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 48 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 49 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 50 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 51 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 52 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 53 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 54 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 55 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 56 | |
| 57 | */ |
| 58 | |
| 59 | #define KMSG_COMPONENT "SFI" |
| 60 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 61 | |
| 62 | #include <linux/bootmem.h> |
| 63 | #include <linux/kernel.h> |
| 64 | #include <linux/module.h> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 65 | #include <linux/errno.h> |
| 66 | #include <linux/types.h> |
| 67 | #include <linux/acpi.h> |
| 68 | #include <linux/init.h> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 69 | #include <linux/sfi.h> |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 70 | #include <linux/slab.h> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 71 | |
| 72 | #include "sfi_core.h" |
| 73 | |
| 74 | #define ON_SAME_PAGE(addr1, addr2) \ |
| 75 | (((unsigned long)(addr1) & PAGE_MASK) == \ |
| 76 | ((unsigned long)(addr2) & PAGE_MASK)) |
| 77 | #define TABLE_ON_PAGE(page, table, size) (ON_SAME_PAGE(page, table) && \ |
| 78 | ON_SAME_PAGE(page, table + size)) |
| 79 | |
| 80 | int sfi_disabled __read_mostly; |
| 81 | EXPORT_SYMBOL(sfi_disabled); |
| 82 | |
| 83 | static u64 syst_pa __read_mostly; |
| 84 | static struct sfi_table_simple *syst_va __read_mostly; |
| 85 | |
| 86 | /* |
| 87 | * FW creates and saves the SFI tables in memory. When these tables get |
| 88 | * used, they may need to be mapped to virtual address space, and the mapping |
| 89 | * can happen before or after the ioremap() is ready, so a flag is needed |
| 90 | * to indicating this |
| 91 | */ |
| 92 | static u32 sfi_use_ioremap __read_mostly; |
| 93 | |
Rakib Mullick | 01674da | 2009-09-30 16:09:55 -0700 | [diff] [blame] | 94 | /* |
| 95 | * sfi_un/map_memory calls early_ioremap/iounmap which is a __init function |
| 96 | * and introduces section mismatch. So use __ref to make it calm. |
| 97 | */ |
| 98 | static void __iomem * __ref sfi_map_memory(u64 phys, u32 size) |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 99 | { |
| 100 | if (!phys || !size) |
| 101 | return NULL; |
| 102 | |
| 103 | if (sfi_use_ioremap) |
| 104 | return ioremap(phys, size); |
| 105 | else |
| 106 | return early_ioremap(phys, size); |
| 107 | } |
| 108 | |
Rakib Mullick | 01674da | 2009-09-30 16:09:55 -0700 | [diff] [blame] | 109 | static void __ref sfi_unmap_memory(void __iomem *virt, u32 size) |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 110 | { |
| 111 | if (!virt || !size) |
| 112 | return; |
| 113 | |
| 114 | if (sfi_use_ioremap) |
| 115 | iounmap(virt); |
| 116 | else |
| 117 | early_iounmap(virt, size); |
| 118 | } |
| 119 | |
| 120 | static void sfi_print_table_header(unsigned long long pa, |
| 121 | struct sfi_table_header *header) |
| 122 | { |
| 123 | pr_info("%4.4s %llX, %04X (v%d %6.6s %8.8s)\n", |
| 124 | header->sig, pa, |
| 125 | header->len, header->rev, header->oem_id, |
| 126 | header->oem_table_id); |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * sfi_verify_table() |
| 131 | * Sanity check table lengh, calculate checksum |
| 132 | */ |
Arjan van de Ven | 011a606 | 2009-10-02 07:29:47 -0700 | [diff] [blame] | 133 | static int sfi_verify_table(struct sfi_table_header *table) |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 134 | { |
| 135 | |
| 136 | u8 checksum = 0; |
| 137 | u8 *puchar = (u8 *)table; |
| 138 | u32 length = table->len; |
| 139 | |
| 140 | /* Sanity check table length against arbitrary 1MB limit */ |
| 141 | if (length > 0x100000) { |
| 142 | pr_err("Invalid table length 0x%x\n", length); |
| 143 | return -1; |
| 144 | } |
| 145 | |
| 146 | while (length--) |
| 147 | checksum += *puchar++; |
| 148 | |
| 149 | if (checksum) { |
| 150 | pr_err("Checksum %2.2X should be %2.2X\n", |
| 151 | table->csum, table->csum - checksum); |
| 152 | return -1; |
| 153 | } |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * sfi_map_table() |
| 159 | * |
| 160 | * Return address of mapped table |
| 161 | * Check for common case that we can re-use mapping to SYST, |
| 162 | * which requires syst_pa, syst_va to be initialized. |
| 163 | */ |
| 164 | struct sfi_table_header *sfi_map_table(u64 pa) |
| 165 | { |
| 166 | struct sfi_table_header *th; |
| 167 | u32 length; |
| 168 | |
| 169 | if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header))) |
| 170 | th = sfi_map_memory(pa, sizeof(struct sfi_table_header)); |
| 171 | else |
| 172 | th = (void *)syst_va + (pa - syst_pa); |
| 173 | |
| 174 | /* If table fits on same page as its header, we are done */ |
| 175 | if (TABLE_ON_PAGE(th, th, th->len)) |
| 176 | return th; |
| 177 | |
| 178 | /* Entire table does not fit on same page as SYST */ |
| 179 | length = th->len; |
| 180 | if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header))) |
| 181 | sfi_unmap_memory(th, sizeof(struct sfi_table_header)); |
| 182 | |
| 183 | return sfi_map_memory(pa, length); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * sfi_unmap_table() |
| 188 | * |
| 189 | * Undoes effect of sfi_map_table() by unmapping table |
| 190 | * if it did not completely fit on same page as SYST. |
| 191 | */ |
| 192 | void sfi_unmap_table(struct sfi_table_header *th) |
| 193 | { |
| 194 | if (!TABLE_ON_PAGE(syst_va, th, th->len)) |
| 195 | sfi_unmap_memory(th, TABLE_ON_PAGE(th, th, th->len) ? |
| 196 | sizeof(*th) : th->len); |
| 197 | } |
| 198 | |
| 199 | static int sfi_table_check_key(struct sfi_table_header *th, |
| 200 | struct sfi_table_key *key) |
| 201 | { |
| 202 | |
| 203 | if (strncmp(th->sig, key->sig, SFI_SIGNATURE_SIZE) |
| 204 | || (key->oem_id && strncmp(th->oem_id, |
| 205 | key->oem_id, SFI_OEM_ID_SIZE)) |
| 206 | || (key->oem_table_id && strncmp(th->oem_table_id, |
| 207 | key->oem_table_id, SFI_OEM_TABLE_ID_SIZE))) |
| 208 | return -1; |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * This function will be used in 2 cases: |
| 215 | * 1. used to enumerate and verify the tables addressed by SYST/XSDT, |
| 216 | * thus no signature will be given (in kernel boot phase) |
| 217 | * 2. used to parse one specific table, signature must exist, and |
| 218 | * the mapped virt address will be returned, and the virt space |
| 219 | * will be released by call sfi_put_table() later |
| 220 | * |
Rakib Mullick | 01674da | 2009-09-30 16:09:55 -0700 | [diff] [blame] | 221 | * This two cases are from two different functions with two different |
| 222 | * sections and causes section mismatch warning. So use __ref to tell |
| 223 | * modpost not to make any noise. |
| 224 | * |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 225 | * Return value: |
| 226 | * NULL: when can't find a table matching the key |
| 227 | * ERR_PTR(error): error value |
| 228 | * virt table address: when a matched table is found |
| 229 | */ |
Rakib Mullick | 01674da | 2009-09-30 16:09:55 -0700 | [diff] [blame] | 230 | struct sfi_table_header * |
| 231 | __ref sfi_check_table(u64 pa, struct sfi_table_key *key) |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 232 | { |
| 233 | struct sfi_table_header *th; |
| 234 | void *ret = NULL; |
| 235 | |
| 236 | th = sfi_map_table(pa); |
| 237 | if (!th) |
| 238 | return ERR_PTR(-ENOMEM); |
| 239 | |
| 240 | if (!key->sig) { |
| 241 | sfi_print_table_header(pa, th); |
| 242 | if (sfi_verify_table(th)) |
| 243 | ret = ERR_PTR(-EINVAL); |
| 244 | } else { |
| 245 | if (!sfi_table_check_key(th, key)) |
| 246 | return th; /* Success */ |
| 247 | } |
| 248 | |
| 249 | sfi_unmap_table(th); |
| 250 | return ret; |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * sfi_get_table() |
| 255 | * |
| 256 | * Search SYST for the specified table with the signature in |
| 257 | * the key, and return the mapped table |
| 258 | */ |
| 259 | struct sfi_table_header *sfi_get_table(struct sfi_table_key *key) |
| 260 | { |
| 261 | struct sfi_table_header *th; |
| 262 | u32 tbl_cnt, i; |
| 263 | |
| 264 | tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64); |
| 265 | for (i = 0; i < tbl_cnt; i++) { |
| 266 | th = sfi_check_table(syst_va->pentry[i], key); |
| 267 | if (!IS_ERR(th) && th) |
| 268 | return th; |
| 269 | } |
| 270 | |
| 271 | return NULL; |
| 272 | } |
| 273 | |
| 274 | void sfi_put_table(struct sfi_table_header *th) |
| 275 | { |
| 276 | sfi_unmap_table(th); |
| 277 | } |
| 278 | |
| 279 | /* Find table with signature, run handler on it */ |
| 280 | int sfi_table_parse(char *signature, char *oem_id, char *oem_table_id, |
| 281 | sfi_table_handler handler) |
| 282 | { |
| 283 | struct sfi_table_header *table = NULL; |
| 284 | struct sfi_table_key key; |
| 285 | int ret = -EINVAL; |
| 286 | |
| 287 | if (sfi_disabled || !handler || !signature) |
| 288 | goto exit; |
| 289 | |
| 290 | key.sig = signature; |
| 291 | key.oem_id = oem_id; |
| 292 | key.oem_table_id = oem_table_id; |
| 293 | |
| 294 | table = sfi_get_table(&key); |
| 295 | if (!table) |
| 296 | goto exit; |
| 297 | |
| 298 | ret = handler(table); |
| 299 | sfi_put_table(table); |
| 300 | exit: |
| 301 | return ret; |
| 302 | } |
| 303 | EXPORT_SYMBOL_GPL(sfi_table_parse); |
| 304 | |
| 305 | /* |
| 306 | * sfi_parse_syst() |
| 307 | * Checksum all the tables in SYST and print their headers |
| 308 | * |
| 309 | * success: set syst_va, return 0 |
| 310 | */ |
| 311 | static int __init sfi_parse_syst(void) |
| 312 | { |
| 313 | struct sfi_table_key key = SFI_ANY_KEY; |
| 314 | int tbl_cnt, i; |
| 315 | void *ret; |
| 316 | |
| 317 | syst_va = sfi_map_memory(syst_pa, sizeof(struct sfi_table_simple)); |
| 318 | if (!syst_va) |
| 319 | return -ENOMEM; |
| 320 | |
| 321 | tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64); |
| 322 | for (i = 0; i < tbl_cnt; i++) { |
| 323 | ret = sfi_check_table(syst_va->pentry[i], &key); |
| 324 | if (IS_ERR(ret)) |
| 325 | return PTR_ERR(ret); |
| 326 | } |
| 327 | |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * The OS finds the System Table by searching 16-byte boundaries between |
| 333 | * physical address 0x000E0000 and 0x000FFFFF. The OS shall search this region |
| 334 | * starting at the low address and shall stop searching when the 1st valid SFI |
| 335 | * System Table is found. |
| 336 | * |
| 337 | * success: set syst_pa, return 0 |
| 338 | * fail: return -1 |
| 339 | */ |
| 340 | static __init int sfi_find_syst(void) |
| 341 | { |
| 342 | unsigned long offset, len; |
| 343 | void *start; |
| 344 | |
| 345 | len = SFI_SYST_SEARCH_END - SFI_SYST_SEARCH_BEGIN; |
| 346 | start = sfi_map_memory(SFI_SYST_SEARCH_BEGIN, len); |
| 347 | if (!start) |
| 348 | return -1; |
| 349 | |
| 350 | for (offset = 0; offset < len; offset += 16) { |
| 351 | struct sfi_table_header *syst_hdr; |
| 352 | |
| 353 | syst_hdr = start + offset; |
| 354 | if (strncmp(syst_hdr->sig, SFI_SIG_SYST, |
| 355 | SFI_SIGNATURE_SIZE)) |
| 356 | continue; |
| 357 | |
| 358 | if (syst_hdr->len > PAGE_SIZE) |
| 359 | continue; |
| 360 | |
| 361 | sfi_print_table_header(SFI_SYST_SEARCH_BEGIN + offset, |
| 362 | syst_hdr); |
| 363 | |
| 364 | if (sfi_verify_table(syst_hdr)) |
| 365 | continue; |
| 366 | |
| 367 | /* |
| 368 | * Enforce SFI spec mandate that SYST reside within a page. |
| 369 | */ |
| 370 | if (!ON_SAME_PAGE(syst_pa, syst_pa + syst_hdr->len)) { |
| 371 | pr_info("SYST 0x%llx + 0x%x crosses page\n", |
| 372 | syst_pa, syst_hdr->len); |
| 373 | continue; |
| 374 | } |
| 375 | |
| 376 | /* Success */ |
| 377 | syst_pa = SFI_SYST_SEARCH_BEGIN + offset; |
| 378 | sfi_unmap_memory(start, len); |
| 379 | return 0; |
| 380 | } |
| 381 | |
| 382 | sfi_unmap_memory(start, len); |
| 383 | return -1; |
| 384 | } |
| 385 | |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 386 | static struct kobject *sfi_kobj; |
| 387 | static struct kobject *tables_kobj; |
| 388 | |
| 389 | static ssize_t sfi_table_show(struct file *filp, struct kobject *kobj, |
| 390 | struct bin_attribute *bin_attr, char *buf, |
| 391 | loff_t offset, size_t count) |
| 392 | { |
| 393 | struct sfi_table_attr *tbl_attr = |
| 394 | container_of(bin_attr, struct sfi_table_attr, attr); |
| 395 | struct sfi_table_header *th = NULL; |
| 396 | struct sfi_table_key key; |
| 397 | ssize_t cnt; |
| 398 | |
| 399 | key.sig = tbl_attr->name; |
| 400 | key.oem_id = NULL; |
| 401 | key.oem_table_id = NULL; |
| 402 | |
| 403 | if (strncmp(SFI_SIG_SYST, tbl_attr->name, SFI_SIGNATURE_SIZE)) { |
| 404 | th = sfi_get_table(&key); |
| 405 | if (!th) |
| 406 | return 0; |
| 407 | |
| 408 | cnt = memory_read_from_buffer(buf, count, &offset, |
| 409 | th, th->len); |
| 410 | sfi_put_table(th); |
| 411 | } else |
| 412 | cnt = memory_read_from_buffer(buf, count, &offset, |
| 413 | syst_va, syst_va->header.len); |
| 414 | |
| 415 | return cnt; |
| 416 | } |
| 417 | |
| 418 | struct sfi_table_attr __init *sfi_sysfs_install_table(u64 pa) |
| 419 | { |
| 420 | struct sfi_table_attr *tbl_attr; |
| 421 | struct sfi_table_header *th; |
| 422 | int ret; |
| 423 | |
| 424 | tbl_attr = kzalloc(sizeof(struct sfi_table_attr), GFP_KERNEL); |
| 425 | if (!tbl_attr) |
| 426 | return NULL; |
| 427 | |
| 428 | th = sfi_map_table(pa); |
| 429 | if (!th || !th->sig[0]) { |
| 430 | kfree(tbl_attr); |
| 431 | return NULL; |
| 432 | } |
| 433 | |
| 434 | sysfs_attr_init(&tbl_attr->attr.attr); |
| 435 | memcpy(tbl_attr->name, th->sig, SFI_SIGNATURE_SIZE); |
| 436 | |
| 437 | tbl_attr->attr.size = 0; |
| 438 | tbl_attr->attr.read = sfi_table_show; |
| 439 | tbl_attr->attr.attr.name = tbl_attr->name; |
| 440 | tbl_attr->attr.attr.mode = 0400; |
| 441 | |
| 442 | ret = sysfs_create_bin_file(tables_kobj, |
| 443 | &tbl_attr->attr); |
Dan Carpenter | e29df91 | 2010-05-28 12:33:15 +0200 | [diff] [blame^] | 444 | if (ret) { |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 445 | kfree(tbl_attr); |
Dan Carpenter | e29df91 | 2010-05-28 12:33:15 +0200 | [diff] [blame^] | 446 | tbl_attr = NULL; |
| 447 | } |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 448 | |
| 449 | sfi_unmap_table(th); |
| 450 | return tbl_attr; |
| 451 | } |
| 452 | |
| 453 | static int __init sfi_sysfs_init(void) |
| 454 | { |
| 455 | int tbl_cnt, i; |
| 456 | |
| 457 | if (sfi_disabled) |
| 458 | return 0; |
| 459 | |
| 460 | sfi_kobj = kobject_create_and_add("sfi", firmware_kobj); |
| 461 | if (!sfi_kobj) |
| 462 | return 0; |
| 463 | |
| 464 | tables_kobj = kobject_create_and_add("tables", sfi_kobj); |
| 465 | if (!tables_kobj) { |
| 466 | kobject_put(sfi_kobj); |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | sfi_sysfs_install_table(syst_pa); |
| 471 | |
| 472 | tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64); |
| 473 | |
| 474 | for (i = 0; i < tbl_cnt; i++) |
| 475 | sfi_sysfs_install_table(syst_va->pentry[i]); |
| 476 | |
| 477 | sfi_acpi_sysfs_init(); |
| 478 | kobject_uevent(sfi_kobj, KOBJ_ADD); |
| 479 | kobject_uevent(tables_kobj, KOBJ_ADD); |
| 480 | pr_info("SFI sysfs interfaces init success\n"); |
| 481 | return 0; |
| 482 | } |
| 483 | |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 484 | void __init sfi_init(void) |
| 485 | { |
| 486 | if (!acpi_disabled) |
| 487 | disable_sfi(); |
| 488 | |
| 489 | if (sfi_disabled) |
| 490 | return; |
| 491 | |
Feng Tang | 5487ab4 | 2010-05-25 16:40:47 +0800 | [diff] [blame] | 492 | pr_info("Simple Firmware Interface v0.81 http://simplefirmware.org\n"); |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 493 | |
| 494 | if (sfi_find_syst() || sfi_parse_syst() || sfi_platform_init()) |
| 495 | disable_sfi(); |
| 496 | |
| 497 | return; |
| 498 | } |
| 499 | |
| 500 | void __init sfi_init_late(void) |
| 501 | { |
| 502 | int length; |
| 503 | |
| 504 | if (sfi_disabled) |
| 505 | return; |
| 506 | |
| 507 | length = syst_va->header.len; |
| 508 | sfi_unmap_memory(syst_va, sizeof(struct sfi_table_simple)); |
| 509 | |
| 510 | /* Use ioremap now after it is ready */ |
| 511 | sfi_use_ioremap = 1; |
| 512 | syst_va = sfi_map_memory(syst_pa, length); |
| 513 | |
| 514 | sfi_acpi_init(); |
| 515 | } |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 516 | |
| 517 | /* |
| 518 | * The reason we put it here becasue we need wait till the /sys/firmware |
| 519 | * is setup, then our interface can be registered in /sys/firmware/sfi |
| 520 | */ |
| 521 | core_initcall(sfi_sysfs_init); |