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