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