1 /* 2 * CMOS/NV-RAM driver for Linux 3 * 4 * Copyright (C) 1997 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> 5 * idea by and with help from Richard Jelinek <rj@suse.de> 6 * Portions copyright (c) 2001,2002 Sun Microsystems (thockin@sun.com) 7 * 8 * This driver allows you to access the contents of the non-volatile memory in 9 * the mc146818rtc.h real-time clock. This chip is built into all PCs and into 10 * many Atari machines. In the former it's called "CMOS-RAM", in the latter 11 * "NVRAM" (NV stands for non-volatile). 12 * 13 * The data are supplied as a (seekable) character device, /dev/nvram. The 14 * size of this file is dependent on the controller. The usual size is 114, 15 * the number of freely available bytes in the memory (i.e., not used by the 16 * RTC itself). 17 * 18 * Checksums over the NVRAM contents are managed by this driver. In case of a 19 * bad checksum, reads and writes return -EIO. The checksum can be initialized 20 * to a sane state either by ioctl(NVRAM_INIT) (clear whole NVRAM) or 21 * ioctl(NVRAM_SETCKS) (doesn't change contents, just makes checksum valid 22 * again; use with care!) 23 * 24 * This file also provides some functions for other parts of the kernel that 25 * want to access the NVRAM: nvram_{read,write,check_checksum,set_checksum}. 26 * Obviously this can be used only if this driver is always configured into 27 * the kernel and is not a module. Since the functions are used by some Atari 28 * drivers, this is the case on the Atari. 29 * 30 * 31 * 1.1 Cesar Barros: SMP locking fixes 32 * added changelog 33 * 1.2 Erik Gilling: Cobalt Networks support 34 * Tim Hockin: general cleanup, Cobalt support 35 */ 36 37 #define NVRAM_VERSION "1.2" 38 39 #include <linux/module.h> 40 #include <linux/sched.h> 41 #include <linux/smp_lock.h> 42 #include <linux/nvram.h> 43 44 #define PC 1 45 #define ATARI 2 46 #define COBALT 3 47 48 /* select machine configuration */ 49 #if defined(CONFIG_ATARI) 50 # define MACH ATARI 51 #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */ 52 #define MACH PC 53 # if defined(CONFIG_COBALT) 54 # include <linux/cobalt-nvram.h> 55 # define MACH COBALT 56 # else 57 # define MACH PC 58 # endif 59 #else 60 # error Cannot build nvram driver for this machine configuration. 61 #endif 62 63 #if MACH == PC 64 65 /* RTC in a PC */ 66 #define CHECK_DRIVER_INIT() 1 67 68 /* On PCs, the checksum is built only over bytes 2..31 */ 69 #define PC_CKS_RANGE_START 2 70 #define PC_CKS_RANGE_END 31 71 #define PC_CKS_LOC 32 72 #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) 73 74 #define mach_check_checksum pc_check_checksum 75 #define mach_set_checksum pc_set_checksum 76 #define mach_proc_infos pc_proc_infos 77 78 #endif 79 80 #if MACH == COBALT 81 82 #define CHECK_DRIVER_INIT() 1 83 84 #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) 85 86 #define mach_check_checksum cobalt_check_checksum 87 #define mach_set_checksum cobalt_set_checksum 88 #define mach_proc_infos cobalt_proc_infos 89 90 #endif 91 92 #if MACH == ATARI 93 94 /* Special parameters for RTC in Atari machines */ 95 #include <asm/atarihw.h> 96 #include <asm/atariints.h> 97 #define RTC_PORT(x) (TT_RTC_BAS + 2*(x)) 98 #define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK)) 99 100 #define NVRAM_BYTES 50 101 102 /* On Ataris, the checksum is over all bytes except the checksum bytes 103 * themselves; these are at the very end */ 104 #define ATARI_CKS_RANGE_START 0 105 #define ATARI_CKS_RANGE_END 47 106 #define ATARI_CKS_LOC 48 107 108 #define mach_check_checksum atari_check_checksum 109 #define mach_set_checksum atari_set_checksum 110 #define mach_proc_infos atari_proc_infos 111 112 #endif 113 114 /* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with 115 * rtc_lock held. Due to the index-port/data-port design of the RTC, we 116 * don't want two different things trying to get to it at once. (e.g. the 117 * periodic 11 min sync from time.c vs. this driver.) 118 */ 119 120 #include <linux/types.h> 121 #include <linux/errno.h> 122 #include <linux/miscdevice.h> 123 #include <linux/slab.h> 124 #include <linux/ioport.h> 125 #include <linux/fcntl.h> 126 #include <linux/mc146818rtc.h> 127 #include <linux/init.h> 128 #include <linux/proc_fs.h> 129 #include <linux/spinlock.h> 130 131 #include <asm/io.h> 132 #include <asm/uaccess.h> 133 #include <asm/system.h> 134 135 static DEFINE_SPINLOCK(nvram_state_lock); 136 static int nvram_open_cnt; /* #times opened */ 137 static int nvram_open_mode; /* special open modes */ 138 #define NVRAM_WRITE 1 /* opened for writing (exclusive) */ 139 #define NVRAM_EXCL 2 /* opened with O_EXCL */ 140 141 static int mach_check_checksum(void); 142 static void mach_set_checksum(void); 143 144 #ifdef CONFIG_PROC_FS 145 static int mach_proc_infos(unsigned char *contents, char *buffer, int *len, 146 off_t *begin, off_t offset, int size); 147 #endif 148 149 /* 150 * These functions are provided to be called internally or by other parts of 151 * the kernel. It's up to the caller to ensure correct checksum before reading 152 * or after writing (needs to be done only once). 153 * 154 * It is worth noting that these functions all access bytes of general 155 * purpose memory in the NVRAM - that is to say, they all add the 156 * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not 157 * know about the RTC cruft. 158 */ 159 160 unsigned char 161 __nvram_read_byte(int i) 162 { 163 return CMOS_READ(NVRAM_FIRST_BYTE + i); 164 } 165 166 unsigned char 167 nvram_read_byte(int i) 168 { 169 unsigned long flags; 170 unsigned char c; 171 172 spin_lock_irqsave(&rtc_lock, flags); 173 c = __nvram_read_byte(i); 174 spin_unlock_irqrestore(&rtc_lock, flags); 175 return c; 176 } 177 178 /* This races nicely with trying to read with checksum checking (nvram_read) */ 179 void 180 __nvram_write_byte(unsigned char c, int i) 181 { 182 CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); 183 } 184 185 void 186 nvram_write_byte(unsigned char c, int i) 187 { 188 unsigned long flags; 189 190 spin_lock_irqsave(&rtc_lock, flags); 191 __nvram_write_byte(c, i); 192 spin_unlock_irqrestore(&rtc_lock, flags); 193 } 194 195 int 196 __nvram_check_checksum(void) 197 { 198 return mach_check_checksum(); 199 } 200 201 int 202 nvram_check_checksum(void) 203 { 204 unsigned long flags; 205 int rv; 206 207 spin_lock_irqsave(&rtc_lock, flags); 208 rv = __nvram_check_checksum(); 209 spin_unlock_irqrestore(&rtc_lock, flags); 210 return rv; 211 } 212 213 static void 214 __nvram_set_checksum(void) 215 { 216 mach_set_checksum(); 217 } 218 219 #if 0 220 void 221 nvram_set_checksum(void) 222 { 223 unsigned long flags; 224 225 spin_lock_irqsave(&rtc_lock, flags); 226 __nvram_set_checksum(); 227 spin_unlock_irqrestore(&rtc_lock, flags); 228 } 229 #endif /* 0 */ 230 231 /* 232 * The are the file operation function for user access to /dev/nvram 233 */ 234 235 static loff_t nvram_llseek(struct file *file,loff_t offset, int origin ) 236 { 237 lock_kernel(); 238 switch (origin) { 239 case 0: 240 /* nothing to do */ 241 break; 242 case 1: 243 offset += file->f_pos; 244 break; 245 case 2: 246 offset += NVRAM_BYTES; 247 break; 248 } 249 unlock_kernel(); 250 return (offset >= 0) ? (file->f_pos = offset) : -EINVAL; 251 } 252 253 static ssize_t 254 nvram_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 255 { 256 unsigned char contents[NVRAM_BYTES]; 257 unsigned i = *ppos; 258 unsigned char *tmp; 259 260 spin_lock_irq(&rtc_lock); 261 262 if (!__nvram_check_checksum()) 263 goto checksum_err; 264 265 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) 266 *tmp = __nvram_read_byte(i); 267 268 spin_unlock_irq(&rtc_lock); 269 270 if (copy_to_user(buf, contents, tmp - contents)) 271 return -EFAULT; 272 273 *ppos = i; 274 275 return tmp - contents; 276 277 checksum_err: 278 spin_unlock_irq(&rtc_lock); 279 return -EIO; 280 } 281 282 static ssize_t 283 nvram_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 284 { 285 unsigned char contents[NVRAM_BYTES]; 286 unsigned i = *ppos; 287 unsigned char *tmp; 288 int len; 289 290 len = (NVRAM_BYTES - i) < count ? (NVRAM_BYTES - i) : count; 291 if (copy_from_user(contents, buf, len)) 292 return -EFAULT; 293 294 spin_lock_irq(&rtc_lock); 295 296 if (!__nvram_check_checksum()) 297 goto checksum_err; 298 299 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) 300 __nvram_write_byte(*tmp, i); 301 302 __nvram_set_checksum(); 303 304 spin_unlock_irq(&rtc_lock); 305 306 *ppos = i; 307 308 return tmp - contents; 309 310 checksum_err: 311 spin_unlock_irq(&rtc_lock); 312 return -EIO; 313 } 314 315 static int 316 nvram_ioctl(struct inode *inode, struct file *file, 317 unsigned int cmd, unsigned long arg) 318 { 319 int i; 320 321 switch (cmd) { 322 323 case NVRAM_INIT: 324 /* initialize NVRAM contents and checksum */ 325 if (!capable(CAP_SYS_ADMIN)) 326 return -EACCES; 327 328 spin_lock_irq(&rtc_lock); 329 330 for (i = 0; i < NVRAM_BYTES; ++i) 331 __nvram_write_byte(0, i); 332 __nvram_set_checksum(); 333 334 spin_unlock_irq(&rtc_lock); 335 return 0; 336 337 case NVRAM_SETCKS: 338 /* just set checksum, contents unchanged (maybe useful after 339 * checksum garbaged somehow...) */ 340 if (!capable(CAP_SYS_ADMIN)) 341 return -EACCES; 342 343 spin_lock_irq(&rtc_lock); 344 __nvram_set_checksum(); 345 spin_unlock_irq(&rtc_lock); 346 return 0; 347 348 default: 349 return -ENOTTY; 350 } 351 } 352 353 static int 354 nvram_open(struct inode *inode, struct file *file) 355 { 356 spin_lock(&nvram_state_lock); 357 358 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || 359 (nvram_open_mode & NVRAM_EXCL) || 360 ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) { 361 spin_unlock(&nvram_state_lock); 362 return -EBUSY; 363 } 364 365 if (file->f_flags & O_EXCL) 366 nvram_open_mode |= NVRAM_EXCL; 367 if (file->f_mode & 2) 368 nvram_open_mode |= NVRAM_WRITE; 369 nvram_open_cnt++; 370 371 spin_unlock(&nvram_state_lock); 372 373 return 0; 374 } 375 376 static int 377 nvram_release(struct inode *inode, struct file *file) 378 { 379 spin_lock(&nvram_state_lock); 380 381 nvram_open_cnt--; 382 383 /* if only one instance is open, clear the EXCL bit */ 384 if (nvram_open_mode & NVRAM_EXCL) 385 nvram_open_mode &= ~NVRAM_EXCL; 386 if (file->f_mode & 2) 387 nvram_open_mode &= ~NVRAM_WRITE; 388 389 spin_unlock(&nvram_state_lock); 390 391 return 0; 392 } 393 394 #ifndef CONFIG_PROC_FS 395 static int 396 nvram_read_proc(char *buffer, char **start, off_t offset, 397 int size, int *eof, void *data) 398 { 399 return 0; 400 } 401 #else 402 403 static int 404 nvram_read_proc(char *buffer, char **start, off_t offset, 405 int size, int *eof, void *data) 406 { 407 unsigned char contents[NVRAM_BYTES]; 408 int i, len = 0; 409 off_t begin = 0; 410 411 spin_lock_irq(&rtc_lock); 412 for (i = 0; i < NVRAM_BYTES; ++i) 413 contents[i] = __nvram_read_byte(i); 414 spin_unlock_irq(&rtc_lock); 415 416 *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size); 417 418 if (offset >= begin + len) 419 return 0; 420 *start = buffer + (offset - begin); 421 return (size < begin + len - offset) ? size : begin + len - offset; 422 423 } 424 425 /* This macro frees the machine specific function from bounds checking and 426 * this like that... */ 427 #define PRINT_PROC(fmt,args...) \ 428 do { \ 429 *len += sprintf(buffer+*len, fmt, ##args); \ 430 if (*begin + *len > offset + size) \ 431 return 0; \ 432 if (*begin + *len < offset) { \ 433 *begin += *len; \ 434 *len = 0; \ 435 } \ 436 } while(0) 437 438 #endif /* CONFIG_PROC_FS */ 439 440 static const struct file_operations nvram_fops = { 441 .owner = THIS_MODULE, 442 .llseek = nvram_llseek, 443 .read = nvram_read, 444 .write = nvram_write, 445 .ioctl = nvram_ioctl, 446 .open = nvram_open, 447 .release = nvram_release, 448 }; 449 450 static struct miscdevice nvram_dev = { 451 NVRAM_MINOR, 452 "nvram", 453 &nvram_fops 454 }; 455 456 static int __init 457 nvram_init(void) 458 { 459 int ret; 460 461 /* First test whether the driver should init at all */ 462 if (!CHECK_DRIVER_INIT()) 463 return -ENXIO; 464 465 ret = misc_register(&nvram_dev); 466 if (ret) { 467 printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", 468 NVRAM_MINOR); 469 goto out; 470 } 471 if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc, 472 NULL)) { 473 printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); 474 ret = -ENOMEM; 475 goto outmisc; 476 } 477 ret = 0; 478 printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); 479 out: 480 return ret; 481 outmisc: 482 misc_deregister(&nvram_dev); 483 goto out; 484 } 485 486 static void __exit 487 nvram_cleanup_module(void) 488 { 489 remove_proc_entry("driver/nvram", NULL); 490 misc_deregister(&nvram_dev); 491 } 492 493 module_init(nvram_init); 494 module_exit(nvram_cleanup_module); 495 496 /* 497 * Machine specific functions 498 */ 499 500 #if MACH == PC 501 502 static int 503 pc_check_checksum(void) 504 { 505 int i; 506 unsigned short sum = 0; 507 unsigned short expect; 508 509 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) 510 sum += __nvram_read_byte(i); 511 expect = __nvram_read_byte(PC_CKS_LOC)<<8 | 512 __nvram_read_byte(PC_CKS_LOC+1); 513 return ((sum & 0xffff) == expect); 514 } 515 516 static void 517 pc_set_checksum(void) 518 { 519 int i; 520 unsigned short sum = 0; 521 522 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) 523 sum += __nvram_read_byte(i); 524 __nvram_write_byte(sum >> 8, PC_CKS_LOC); 525 __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); 526 } 527 528 #ifdef CONFIG_PROC_FS 529 530 static char *floppy_types[] = { 531 "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", 532 "3.5'' 2.88M", "3.5'' 2.88M" 533 }; 534 535 static char *gfx_types[] = { 536 "EGA, VGA, ... (with BIOS)", 537 "CGA (40 cols)", 538 "CGA (80 cols)", 539 "monochrome", 540 }; 541 542 static int 543 pc_proc_infos(unsigned char *nvram, char *buffer, int *len, 544 off_t *begin, off_t offset, int size) 545 { 546 int checksum; 547 int type; 548 549 spin_lock_irq(&rtc_lock); 550 checksum = __nvram_check_checksum(); 551 spin_unlock_irq(&rtc_lock); 552 553 PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); 554 555 PRINT_PROC("# floppies : %d\n", 556 (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); 557 PRINT_PROC("Floppy 0 type : "); 558 type = nvram[2] >> 4; 559 if (type < ARRAY_SIZE(floppy_types)) 560 PRINT_PROC("%s\n", floppy_types[type]); 561 else 562 PRINT_PROC("%d (unknown)\n", type); 563 PRINT_PROC("Floppy 1 type : "); 564 type = nvram[2] & 0x0f; 565 if (type < ARRAY_SIZE(floppy_types)) 566 PRINT_PROC("%s\n", floppy_types[type]); 567 else 568 PRINT_PROC("%d (unknown)\n", type); 569 570 PRINT_PROC("HD 0 type : "); 571 type = nvram[4] >> 4; 572 if (type) 573 PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type); 574 else 575 PRINT_PROC("none\n"); 576 577 PRINT_PROC("HD 1 type : "); 578 type = nvram[4] & 0x0f; 579 if (type) 580 PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type); 581 else 582 PRINT_PROC("none\n"); 583 584 PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", 585 nvram[18] | (nvram[19] << 8), 586 nvram[20], nvram[25], 587 nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); 588 PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", 589 nvram[39] | (nvram[40] << 8), 590 nvram[41], nvram[46], 591 nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); 592 593 PRINT_PROC("DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); 594 PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n", 595 nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); 596 597 PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]); 598 599 PRINT_PROC("FPU : %sinstalled\n", 600 (nvram[6] & 2) ? "" : "not "); 601 602 return 1; 603 } 604 #endif 605 606 #endif /* MACH == PC */ 607 608 #if MACH == COBALT 609 610 /* the cobalt CMOS has a wider range of its checksum */ 611 static int cobalt_check_checksum(void) 612 { 613 int i; 614 unsigned short sum = 0; 615 unsigned short expect; 616 617 for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) { 618 if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1))) 619 continue; 620 621 sum += __nvram_read_byte(i); 622 } 623 expect = __nvram_read_byte(COBT_CMOS_CHECKSUM) << 8 | 624 __nvram_read_byte(COBT_CMOS_CHECKSUM+1); 625 return ((sum & 0xffff) == expect); 626 } 627 628 static void cobalt_set_checksum(void) 629 { 630 int i; 631 unsigned short sum = 0; 632 633 for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) { 634 if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1))) 635 continue; 636 637 sum += __nvram_read_byte(i); 638 } 639 640 __nvram_write_byte(sum >> 8, COBT_CMOS_CHECKSUM); 641 __nvram_write_byte(sum & 0xff, COBT_CMOS_CHECKSUM+1); 642 } 643 644 #ifdef CONFIG_PROC_FS 645 646 static int cobalt_proc_infos(unsigned char *nvram, char *buffer, int *len, 647 off_t *begin, off_t offset, int size) 648 { 649 int i; 650 unsigned int checksum; 651 unsigned int flags; 652 char sernum[14]; 653 char *key = "cNoEbTaWlOtR!"; 654 unsigned char bto_csum; 655 656 spin_lock_irq(&rtc_lock); 657 checksum = __nvram_check_checksum(); 658 spin_unlock_irq(&rtc_lock); 659 660 PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); 661 662 flags = nvram[COBT_CMOS_FLAG_BYTE_0] << 8 663 | nvram[COBT_CMOS_FLAG_BYTE_1]; 664 665 PRINT_PROC("Console: %s\n", 666 flags & COBT_CMOS_CONSOLE_FLAG ? "on": "off"); 667 668 PRINT_PROC("Firmware Debug Messages: %s\n", 669 flags & COBT_CMOS_DEBUG_FLAG ? "on": "off"); 670 671 PRINT_PROC("Auto Prompt: %s\n", 672 flags & COBT_CMOS_AUTO_PROMPT_FLAG ? "on": "off"); 673 674 PRINT_PROC("Shutdown Status: %s\n", 675 flags & COBT_CMOS_CLEAN_BOOT_FLAG ? "clean": "dirty"); 676 677 PRINT_PROC("Hardware Probe: %s\n", 678 flags & COBT_CMOS_HW_NOPROBE_FLAG ? "partial": "full"); 679 680 PRINT_PROC("System Fault: %sdetected\n", 681 flags & COBT_CMOS_SYSFAULT_FLAG ? "": "not "); 682 683 PRINT_PROC("Panic on OOPS: %s\n", 684 flags & COBT_CMOS_OOPSPANIC_FLAG ? "yes": "no"); 685 686 PRINT_PROC("Delayed Cache Initialization: %s\n", 687 flags & COBT_CMOS_DELAY_CACHE_FLAG ? "yes": "no"); 688 689 PRINT_PROC("Show Logo at Boot: %s\n", 690 flags & COBT_CMOS_NOLOGO_FLAG ? "no": "yes"); 691 692 PRINT_PROC("Boot Method: "); 693 switch (nvram[COBT_CMOS_BOOT_METHOD]) { 694 case COBT_CMOS_BOOT_METHOD_DISK: 695 PRINT_PROC("disk\n"); 696 break; 697 698 case COBT_CMOS_BOOT_METHOD_ROM: 699 PRINT_PROC("rom\n"); 700 break; 701 702 case COBT_CMOS_BOOT_METHOD_NET: 703 PRINT_PROC("net\n"); 704 break; 705 706 default: 707 PRINT_PROC("unknown\n"); 708 break; 709 } 710 711 PRINT_PROC("Primary Boot Device: %d:%d\n", 712 nvram[COBT_CMOS_BOOT_DEV0_MAJ], 713 nvram[COBT_CMOS_BOOT_DEV0_MIN] ); 714 PRINT_PROC("Secondary Boot Device: %d:%d\n", 715 nvram[COBT_CMOS_BOOT_DEV1_MAJ], 716 nvram[COBT_CMOS_BOOT_DEV1_MIN] ); 717 PRINT_PROC("Tertiary Boot Device: %d:%d\n", 718 nvram[COBT_CMOS_BOOT_DEV2_MAJ], 719 nvram[COBT_CMOS_BOOT_DEV2_MIN] ); 720 721 PRINT_PROC("Uptime: %d\n", 722 nvram[COBT_CMOS_UPTIME_0] << 24 | 723 nvram[COBT_CMOS_UPTIME_1] << 16 | 724 nvram[COBT_CMOS_UPTIME_2] << 8 | 725 nvram[COBT_CMOS_UPTIME_3]); 726 727 PRINT_PROC("Boot Count: %d\n", 728 nvram[COBT_CMOS_BOOTCOUNT_0] << 24 | 729 nvram[COBT_CMOS_BOOTCOUNT_1] << 16 | 730 nvram[COBT_CMOS_BOOTCOUNT_2] << 8 | 731 nvram[COBT_CMOS_BOOTCOUNT_3]); 732 733 /* 13 bytes of serial num */ 734 for (i=0 ; i<13 ; i++) { 735 sernum[i] = nvram[COBT_CMOS_SYS_SERNUM_0 + i]; 736 } 737 sernum[13] = '\0'; 738 739 checksum = 0; 740 for (i=0 ; i<13 ; i++) { 741 checksum += sernum[i] ^ key[i]; 742 } 743 checksum = ((checksum & 0x7f) ^ (0xd6)) & 0xff; 744 745 PRINT_PROC("Serial Number: %s", sernum); 746 if (checksum != nvram[COBT_CMOS_SYS_SERNUM_CSUM]) { 747 PRINT_PROC(" (invalid checksum)"); 748 } 749 PRINT_PROC("\n"); 750 751 PRINT_PROC("Rom Revison: %d.%d.%d\n", nvram[COBT_CMOS_ROM_REV_MAJ], 752 nvram[COBT_CMOS_ROM_REV_MIN], nvram[COBT_CMOS_ROM_REV_REV]); 753 754 PRINT_PROC("BTO Server: %d.%d.%d.%d", nvram[COBT_CMOS_BTO_IP_0], 755 nvram[COBT_CMOS_BTO_IP_1], nvram[COBT_CMOS_BTO_IP_2], 756 nvram[COBT_CMOS_BTO_IP_3]); 757 bto_csum = nvram[COBT_CMOS_BTO_IP_0] + nvram[COBT_CMOS_BTO_IP_1] 758 + nvram[COBT_CMOS_BTO_IP_2] + nvram[COBT_CMOS_BTO_IP_3]; 759 if (bto_csum != nvram[COBT_CMOS_BTO_IP_CSUM]) { 760 PRINT_PROC(" (invalid checksum)"); 761 } 762 PRINT_PROC("\n"); 763 764 if (flags & COBT_CMOS_VERSION_FLAG 765 && nvram[COBT_CMOS_VERSION] >= COBT_CMOS_VER_BTOCODE) { 766 PRINT_PROC("BTO Code: 0x%x\n", 767 nvram[COBT_CMOS_BTO_CODE_0] << 24 | 768 nvram[COBT_CMOS_BTO_CODE_1] << 16 | 769 nvram[COBT_CMOS_BTO_CODE_2] << 8 | 770 nvram[COBT_CMOS_BTO_CODE_3]); 771 } 772 773 return 1; 774 } 775 #endif /* CONFIG_PROC_FS */ 776 777 #endif /* MACH == COBALT */ 778 779 #if MACH == ATARI 780 781 static int 782 atari_check_checksum(void) 783 { 784 int i; 785 unsigned char sum = 0; 786 787 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) 788 sum += __nvram_read_byte(i); 789 return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) && 790 __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); 791 } 792 793 static void 794 atari_set_checksum(void) 795 { 796 int i; 797 unsigned char sum = 0; 798 799 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) 800 sum += __nvram_read_byte(i); 801 __nvram_write_byte(~sum, ATARI_CKS_LOC); 802 __nvram_write_byte(sum, ATARI_CKS_LOC + 1); 803 } 804 805 #ifdef CONFIG_PROC_FS 806 807 static struct { 808 unsigned char val; 809 char *name; 810 } boot_prefs[] = { 811 { 0x80, "TOS" }, 812 { 0x40, "ASV" }, 813 { 0x20, "NetBSD (?)" }, 814 { 0x10, "Linux" }, 815 { 0x00, "unspecified" } 816 }; 817 818 static char *languages[] = { 819 "English (US)", 820 "German", 821 "French", 822 "English (UK)", 823 "Spanish", 824 "Italian", 825 "6 (undefined)", 826 "Swiss (French)", 827 "Swiss (German)" 828 }; 829 830 static char *dateformat[] = { 831 "MM%cDD%cYY", 832 "DD%cMM%cYY", 833 "YY%cMM%cDD", 834 "YY%cDD%cMM", 835 "4 (undefined)", 836 "5 (undefined)", 837 "6 (undefined)", 838 "7 (undefined)" 839 }; 840 841 static char *colors[] = { 842 "2", "4", "16", "256", "65536", "??", "??", "??" 843 }; 844 845 static int 846 atari_proc_infos(unsigned char *nvram, char *buffer, int *len, 847 off_t *begin, off_t offset, int size) 848 { 849 int checksum = nvram_check_checksum(); 850 int i; 851 unsigned vmode; 852 853 PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not "); 854 855 PRINT_PROC("Boot preference : "); 856 for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) { 857 if (nvram[1] == boot_prefs[i].val) { 858 PRINT_PROC("%s\n", boot_prefs[i].name); 859 break; 860 } 861 } 862 if (i < 0) 863 PRINT_PROC("0x%02x (undefined)\n", nvram[1]); 864 865 PRINT_PROC("SCSI arbitration : %s\n", 866 (nvram[16] & 0x80) ? "on" : "off"); 867 PRINT_PROC("SCSI host ID : "); 868 if (nvram[16] & 0x80) 869 PRINT_PROC("%d\n", nvram[16] & 7); 870 else 871 PRINT_PROC("n/a\n"); 872 873 /* the following entries are defined only for the Falcon */ 874 if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) 875 return 1; 876 877 PRINT_PROC("OS language : "); 878 if (nvram[6] < ARRAY_SIZE(languages)) 879 PRINT_PROC("%s\n", languages[nvram[6]]); 880 else 881 PRINT_PROC("%u (undefined)\n", nvram[6]); 882 PRINT_PROC("Keyboard language: "); 883 if (nvram[7] < ARRAY_SIZE(languages)) 884 PRINT_PROC("%s\n", languages[nvram[7]]); 885 else 886 PRINT_PROC("%u (undefined)\n", nvram[7]); 887 PRINT_PROC("Date format : "); 888 PRINT_PROC(dateformat[nvram[8] & 7], 889 nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); 890 PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12); 891 PRINT_PROC("Boot delay : "); 892 if (nvram[10] == 0) 893 PRINT_PROC("default"); 894 else 895 PRINT_PROC("%ds%s\n", nvram[10], 896 nvram[10] < 8 ? ", no memory test" : ""); 897 898 vmode = (nvram[14] << 8) || nvram[15]; 899 PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n", 900 colors[vmode & 7], 901 vmode & 8 ? 80 : 40, 902 vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); 903 PRINT_PROC(" %soverscan, compat. mode %s%s\n", 904 vmode & 64 ? "" : "no ", 905 vmode & 128 ? "on" : "off", 906 vmode & 256 ? 907 (vmode & 16 ? ", line doubling" : ", half screen") : ""); 908 909 return 1; 910 } 911 #endif 912 913 #endif /* MACH == ATARI */ 914 915 MODULE_LICENSE("GPL"); 916 917 EXPORT_SYMBOL(__nvram_read_byte); 918 EXPORT_SYMBOL(nvram_read_byte); 919 EXPORT_SYMBOL(__nvram_write_byte); 920 EXPORT_SYMBOL(nvram_write_byte); 921 EXPORT_SYMBOL(__nvram_check_checksum); 922 EXPORT_SYMBOL(nvram_check_checksum); 923 MODULE_ALIAS_MISCDEV(NVRAM_MINOR); 924