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 * 1.3 Wim Van Sebroeck: convert PRINT_PROC to seq_file 36 */ 37 38 #define NVRAM_VERSION "1.3" 39 40 #include <linux/module.h> 41 #include <linux/nvram.h> 42 43 #define PC 1 44 #define ATARI 2 45 46 /* select machine configuration */ 47 #if defined(CONFIG_ATARI) 48 # define MACH ATARI 49 #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and ?? */ 50 # define MACH PC 51 #else 52 # error Cannot build nvram driver for this machine configuration. 53 #endif 54 55 #if MACH == PC 56 57 /* RTC in a PC */ 58 #define CHECK_DRIVER_INIT() 1 59 60 /* On PCs, the checksum is built only over bytes 2..31 */ 61 #define PC_CKS_RANGE_START 2 62 #define PC_CKS_RANGE_END 31 63 #define PC_CKS_LOC 32 64 #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) 65 66 #define mach_check_checksum pc_check_checksum 67 #define mach_set_checksum pc_set_checksum 68 #define mach_proc_infos pc_proc_infos 69 70 #endif 71 72 #if MACH == ATARI 73 74 /* Special parameters for RTC in Atari machines */ 75 #include <asm/atarihw.h> 76 #include <asm/atariints.h> 77 #define RTC_PORT(x) (TT_RTC_BAS + 2*(x)) 78 #define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK)) 79 80 #define NVRAM_BYTES 50 81 82 /* On Ataris, the checksum is over all bytes except the checksum bytes 83 * themselves; these are at the very end */ 84 #define ATARI_CKS_RANGE_START 0 85 #define ATARI_CKS_RANGE_END 47 86 #define ATARI_CKS_LOC 48 87 88 #define mach_check_checksum atari_check_checksum 89 #define mach_set_checksum atari_set_checksum 90 #define mach_proc_infos atari_proc_infos 91 92 #endif 93 94 /* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with 95 * rtc_lock held. Due to the index-port/data-port design of the RTC, we 96 * don't want two different things trying to get to it at once. (e.g. the 97 * periodic 11 min sync from time.c vs. this driver.) 98 */ 99 100 #include <linux/types.h> 101 #include <linux/errno.h> 102 #include <linux/miscdevice.h> 103 #include <linux/ioport.h> 104 #include <linux/fcntl.h> 105 #include <linux/mc146818rtc.h> 106 #include <linux/init.h> 107 #include <linux/proc_fs.h> 108 #include <linux/seq_file.h> 109 #include <linux/spinlock.h> 110 #include <linux/io.h> 111 #include <linux/uaccess.h> 112 #include <linux/smp_lock.h> 113 114 #include <asm/system.h> 115 116 static DEFINE_SPINLOCK(nvram_state_lock); 117 static int nvram_open_cnt; /* #times opened */ 118 static int nvram_open_mode; /* special open modes */ 119 #define NVRAM_WRITE 1 /* opened for writing (exclusive) */ 120 #define NVRAM_EXCL 2 /* opened with O_EXCL */ 121 122 static int mach_check_checksum(void); 123 static void mach_set_checksum(void); 124 125 #ifdef CONFIG_PROC_FS 126 static void mach_proc_infos(unsigned char *contents, struct seq_file *seq, 127 void *offset); 128 #endif 129 130 /* 131 * These functions are provided to be called internally or by other parts of 132 * the kernel. It's up to the caller to ensure correct checksum before reading 133 * or after writing (needs to be done only once). 134 * 135 * It is worth noting that these functions all access bytes of general 136 * purpose memory in the NVRAM - that is to say, they all add the 137 * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not 138 * know about the RTC cruft. 139 */ 140 141 unsigned char __nvram_read_byte(int i) 142 { 143 return CMOS_READ(NVRAM_FIRST_BYTE + i); 144 } 145 EXPORT_SYMBOL(__nvram_read_byte); 146 147 unsigned char nvram_read_byte(int i) 148 { 149 unsigned long flags; 150 unsigned char c; 151 152 spin_lock_irqsave(&rtc_lock, flags); 153 c = __nvram_read_byte(i); 154 spin_unlock_irqrestore(&rtc_lock, flags); 155 return c; 156 } 157 EXPORT_SYMBOL(nvram_read_byte); 158 159 /* This races nicely with trying to read with checksum checking (nvram_read) */ 160 void __nvram_write_byte(unsigned char c, int i) 161 { 162 CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); 163 } 164 EXPORT_SYMBOL(__nvram_write_byte); 165 166 void nvram_write_byte(unsigned char c, int i) 167 { 168 unsigned long flags; 169 170 spin_lock_irqsave(&rtc_lock, flags); 171 __nvram_write_byte(c, i); 172 spin_unlock_irqrestore(&rtc_lock, flags); 173 } 174 EXPORT_SYMBOL(nvram_write_byte); 175 176 int __nvram_check_checksum(void) 177 { 178 return mach_check_checksum(); 179 } 180 EXPORT_SYMBOL(__nvram_check_checksum); 181 182 int nvram_check_checksum(void) 183 { 184 unsigned long flags; 185 int rv; 186 187 spin_lock_irqsave(&rtc_lock, flags); 188 rv = __nvram_check_checksum(); 189 spin_unlock_irqrestore(&rtc_lock, flags); 190 return rv; 191 } 192 EXPORT_SYMBOL(nvram_check_checksum); 193 194 static void __nvram_set_checksum(void) 195 { 196 mach_set_checksum(); 197 } 198 199 #if 0 200 void nvram_set_checksum(void) 201 { 202 unsigned long flags; 203 204 spin_lock_irqsave(&rtc_lock, flags); 205 __nvram_set_checksum(); 206 spin_unlock_irqrestore(&rtc_lock, flags); 207 } 208 #endif /* 0 */ 209 210 /* 211 * The are the file operation function for user access to /dev/nvram 212 */ 213 214 static loff_t nvram_llseek(struct file *file, loff_t offset, int origin) 215 { 216 switch (origin) { 217 case 0: 218 /* nothing to do */ 219 break; 220 case 1: 221 offset += file->f_pos; 222 break; 223 case 2: 224 offset += NVRAM_BYTES; 225 break; 226 } 227 228 return (offset >= 0) ? (file->f_pos = offset) : -EINVAL; 229 } 230 231 static ssize_t nvram_read(struct file *file, char __user *buf, 232 size_t count, loff_t *ppos) 233 { 234 unsigned char contents[NVRAM_BYTES]; 235 unsigned i = *ppos; 236 unsigned char *tmp; 237 238 spin_lock_irq(&rtc_lock); 239 240 if (!__nvram_check_checksum()) 241 goto checksum_err; 242 243 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) 244 *tmp = __nvram_read_byte(i); 245 246 spin_unlock_irq(&rtc_lock); 247 248 if (copy_to_user(buf, contents, tmp - contents)) 249 return -EFAULT; 250 251 *ppos = i; 252 253 return tmp - contents; 254 255 checksum_err: 256 spin_unlock_irq(&rtc_lock); 257 return -EIO; 258 } 259 260 static ssize_t nvram_write(struct file *file, const char __user *buf, 261 size_t count, loff_t *ppos) 262 { 263 unsigned char contents[NVRAM_BYTES]; 264 unsigned i = *ppos; 265 unsigned char *tmp; 266 267 if (i >= NVRAM_BYTES) 268 return 0; /* Past EOF */ 269 270 if (count > NVRAM_BYTES - i) 271 count = NVRAM_BYTES - i; 272 if (count > NVRAM_BYTES) 273 return -EFAULT; /* Can't happen, but prove it to gcc */ 274 275 if (copy_from_user(contents, buf, count)) 276 return -EFAULT; 277 278 spin_lock_irq(&rtc_lock); 279 280 if (!__nvram_check_checksum()) 281 goto checksum_err; 282 283 for (tmp = contents; count--; ++i, ++tmp) 284 __nvram_write_byte(*tmp, i); 285 286 __nvram_set_checksum(); 287 288 spin_unlock_irq(&rtc_lock); 289 290 *ppos = i; 291 292 return tmp - contents; 293 294 checksum_err: 295 spin_unlock_irq(&rtc_lock); 296 return -EIO; 297 } 298 299 static int nvram_ioctl(struct inode *inode, struct file *file, 300 unsigned int cmd, unsigned long arg) 301 { 302 int i; 303 304 switch (cmd) { 305 306 case NVRAM_INIT: 307 /* initialize NVRAM contents and checksum */ 308 if (!capable(CAP_SYS_ADMIN)) 309 return -EACCES; 310 311 spin_lock_irq(&rtc_lock); 312 313 for (i = 0; i < NVRAM_BYTES; ++i) 314 __nvram_write_byte(0, i); 315 __nvram_set_checksum(); 316 317 spin_unlock_irq(&rtc_lock); 318 return 0; 319 320 case NVRAM_SETCKS: 321 /* just set checksum, contents unchanged (maybe useful after 322 * checksum garbaged somehow...) */ 323 if (!capable(CAP_SYS_ADMIN)) 324 return -EACCES; 325 326 spin_lock_irq(&rtc_lock); 327 __nvram_set_checksum(); 328 spin_unlock_irq(&rtc_lock); 329 return 0; 330 331 default: 332 return -ENOTTY; 333 } 334 } 335 336 static int nvram_open(struct inode *inode, struct file *file) 337 { 338 spin_lock(&nvram_state_lock); 339 340 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || 341 (nvram_open_mode & NVRAM_EXCL) || 342 ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) { 343 spin_unlock(&nvram_state_lock); 344 return -EBUSY; 345 } 346 347 if (file->f_flags & O_EXCL) 348 nvram_open_mode |= NVRAM_EXCL; 349 if (file->f_mode & FMODE_WRITE) 350 nvram_open_mode |= NVRAM_WRITE; 351 nvram_open_cnt++; 352 353 spin_unlock(&nvram_state_lock); 354 355 return 0; 356 } 357 358 static int nvram_release(struct inode *inode, struct file *file) 359 { 360 spin_lock(&nvram_state_lock); 361 362 nvram_open_cnt--; 363 364 /* if only one instance is open, clear the EXCL bit */ 365 if (nvram_open_mode & NVRAM_EXCL) 366 nvram_open_mode &= ~NVRAM_EXCL; 367 if (file->f_mode & FMODE_WRITE) 368 nvram_open_mode &= ~NVRAM_WRITE; 369 370 spin_unlock(&nvram_state_lock); 371 372 return 0; 373 } 374 375 #ifndef CONFIG_PROC_FS 376 static int nvram_add_proc_fs(void) 377 { 378 return 0; 379 } 380 381 #else 382 383 static int nvram_proc_read(struct seq_file *seq, void *offset) 384 { 385 unsigned char contents[NVRAM_BYTES]; 386 int i = 0; 387 388 spin_lock_irq(&rtc_lock); 389 for (i = 0; i < NVRAM_BYTES; ++i) 390 contents[i] = __nvram_read_byte(i); 391 spin_unlock_irq(&rtc_lock); 392 393 mach_proc_infos(contents, seq, offset); 394 395 return 0; 396 } 397 398 static int nvram_proc_open(struct inode *inode, struct file *file) 399 { 400 return single_open(file, nvram_proc_read, NULL); 401 } 402 403 static const struct file_operations nvram_proc_fops = { 404 .owner = THIS_MODULE, 405 .open = nvram_proc_open, 406 .read = seq_read, 407 .llseek = seq_lseek, 408 .release = single_release, 409 }; 410 411 static int nvram_add_proc_fs(void) 412 { 413 if (!proc_create("driver/nvram", 0, NULL, &nvram_proc_fops)) 414 return -ENOMEM; 415 return 0; 416 } 417 418 #endif /* CONFIG_PROC_FS */ 419 420 static const struct file_operations nvram_fops = { 421 .owner = THIS_MODULE, 422 .llseek = nvram_llseek, 423 .read = nvram_read, 424 .write = nvram_write, 425 .ioctl = nvram_ioctl, 426 .open = nvram_open, 427 .release = nvram_release, 428 }; 429 430 static struct miscdevice nvram_dev = { 431 NVRAM_MINOR, 432 "nvram", 433 &nvram_fops 434 }; 435 436 static int __init nvram_init(void) 437 { 438 int ret; 439 440 /* First test whether the driver should init at all */ 441 if (!CHECK_DRIVER_INIT()) 442 return -ENODEV; 443 444 ret = misc_register(&nvram_dev); 445 if (ret) { 446 printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", 447 NVRAM_MINOR); 448 goto out; 449 } 450 ret = nvram_add_proc_fs(); 451 if (ret) { 452 printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); 453 goto outmisc; 454 } 455 ret = 0; 456 printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); 457 out: 458 return ret; 459 outmisc: 460 misc_deregister(&nvram_dev); 461 goto out; 462 } 463 464 static void __exit nvram_cleanup_module(void) 465 { 466 remove_proc_entry("driver/nvram", NULL); 467 misc_deregister(&nvram_dev); 468 } 469 470 module_init(nvram_init); 471 module_exit(nvram_cleanup_module); 472 473 /* 474 * Machine specific functions 475 */ 476 477 #if MACH == PC 478 479 static int pc_check_checksum(void) 480 { 481 int i; 482 unsigned short sum = 0; 483 unsigned short expect; 484 485 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) 486 sum += __nvram_read_byte(i); 487 expect = __nvram_read_byte(PC_CKS_LOC)<<8 | 488 __nvram_read_byte(PC_CKS_LOC+1); 489 return (sum & 0xffff) == expect; 490 } 491 492 static void pc_set_checksum(void) 493 { 494 int i; 495 unsigned short sum = 0; 496 497 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) 498 sum += __nvram_read_byte(i); 499 __nvram_write_byte(sum >> 8, PC_CKS_LOC); 500 __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); 501 } 502 503 #ifdef CONFIG_PROC_FS 504 505 static char *floppy_types[] = { 506 "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", 507 "3.5'' 2.88M", "3.5'' 2.88M" 508 }; 509 510 static char *gfx_types[] = { 511 "EGA, VGA, ... (with BIOS)", 512 "CGA (40 cols)", 513 "CGA (80 cols)", 514 "monochrome", 515 }; 516 517 static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq, 518 void *offset) 519 { 520 int checksum; 521 int type; 522 523 spin_lock_irq(&rtc_lock); 524 checksum = __nvram_check_checksum(); 525 spin_unlock_irq(&rtc_lock); 526 527 seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not "); 528 529 seq_printf(seq, "# floppies : %d\n", 530 (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); 531 seq_printf(seq, "Floppy 0 type : "); 532 type = nvram[2] >> 4; 533 if (type < ARRAY_SIZE(floppy_types)) 534 seq_printf(seq, "%s\n", floppy_types[type]); 535 else 536 seq_printf(seq, "%d (unknown)\n", type); 537 seq_printf(seq, "Floppy 1 type : "); 538 type = nvram[2] & 0x0f; 539 if (type < ARRAY_SIZE(floppy_types)) 540 seq_printf(seq, "%s\n", floppy_types[type]); 541 else 542 seq_printf(seq, "%d (unknown)\n", type); 543 544 seq_printf(seq, "HD 0 type : "); 545 type = nvram[4] >> 4; 546 if (type) 547 seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type); 548 else 549 seq_printf(seq, "none\n"); 550 551 seq_printf(seq, "HD 1 type : "); 552 type = nvram[4] & 0x0f; 553 if (type) 554 seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type); 555 else 556 seq_printf(seq, "none\n"); 557 558 seq_printf(seq, "HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", 559 nvram[18] | (nvram[19] << 8), 560 nvram[20], nvram[25], 561 nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); 562 seq_printf(seq, "HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", 563 nvram[39] | (nvram[40] << 8), 564 nvram[41], nvram[46], 565 nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); 566 567 seq_printf(seq, "DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); 568 seq_printf(seq, "Extended memory: %d kB (configured), %d kB (tested)\n", 569 nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); 570 571 seq_printf(seq, "Gfx adapter : %s\n", 572 gfx_types[(nvram[6] >> 4) & 3]); 573 574 seq_printf(seq, "FPU : %sinstalled\n", 575 (nvram[6] & 2) ? "" : "not "); 576 577 return; 578 } 579 #endif 580 581 #endif /* MACH == PC */ 582 583 #if MACH == ATARI 584 585 static int atari_check_checksum(void) 586 { 587 int i; 588 unsigned char sum = 0; 589 590 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) 591 sum += __nvram_read_byte(i); 592 return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) && 593 (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); 594 } 595 596 static void atari_set_checksum(void) 597 { 598 int i; 599 unsigned char sum = 0; 600 601 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) 602 sum += __nvram_read_byte(i); 603 __nvram_write_byte(~sum, ATARI_CKS_LOC); 604 __nvram_write_byte(sum, ATARI_CKS_LOC + 1); 605 } 606 607 #ifdef CONFIG_PROC_FS 608 609 static struct { 610 unsigned char val; 611 char *name; 612 } boot_prefs[] = { 613 { 0x80, "TOS" }, 614 { 0x40, "ASV" }, 615 { 0x20, "NetBSD (?)" }, 616 { 0x10, "Linux" }, 617 { 0x00, "unspecified" } 618 }; 619 620 static char *languages[] = { 621 "English (US)", 622 "German", 623 "French", 624 "English (UK)", 625 "Spanish", 626 "Italian", 627 "6 (undefined)", 628 "Swiss (French)", 629 "Swiss (German)" 630 }; 631 632 static char *dateformat[] = { 633 "MM%cDD%cYY", 634 "DD%cMM%cYY", 635 "YY%cMM%cDD", 636 "YY%cDD%cMM", 637 "4 (undefined)", 638 "5 (undefined)", 639 "6 (undefined)", 640 "7 (undefined)" 641 }; 642 643 static char *colors[] = { 644 "2", "4", "16", "256", "65536", "??", "??", "??" 645 }; 646 647 static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq, 648 void *offset) 649 { 650 int checksum = nvram_check_checksum(); 651 int i; 652 unsigned vmode; 653 654 seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not "); 655 656 seq_printf(seq, "Boot preference : "); 657 for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) { 658 if (nvram[1] == boot_prefs[i].val) { 659 seq_printf(seq, "%s\n", boot_prefs[i].name); 660 break; 661 } 662 } 663 if (i < 0) 664 seq_printf(seq, "0x%02x (undefined)\n", nvram[1]); 665 666 seq_printf(seq, "SCSI arbitration : %s\n", 667 (nvram[16] & 0x80) ? "on" : "off"); 668 seq_printf(seq, "SCSI host ID : "); 669 if (nvram[16] & 0x80) 670 seq_printf(seq, "%d\n", nvram[16] & 7); 671 else 672 seq_printf(seq, "n/a\n"); 673 674 /* the following entries are defined only for the Falcon */ 675 if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) 676 return; 677 678 seq_printf(seq, "OS language : "); 679 if (nvram[6] < ARRAY_SIZE(languages)) 680 seq_printf(seq, "%s\n", languages[nvram[6]]); 681 else 682 seq_printf(seq, "%u (undefined)\n", nvram[6]); 683 seq_printf(seq, "Keyboard language: "); 684 if (nvram[7] < ARRAY_SIZE(languages)) 685 seq_printf(seq, "%s\n", languages[nvram[7]]); 686 else 687 seq_printf(seq, "%u (undefined)\n", nvram[7]); 688 seq_printf(seq, "Date format : "); 689 seq_printf(seq, dateformat[nvram[8] & 7], 690 nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); 691 seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12); 692 seq_printf(seq, "Boot delay : "); 693 if (nvram[10] == 0) 694 seq_printf(seq, "default"); 695 else 696 seq_printf(seq, "%ds%s\n", nvram[10], 697 nvram[10] < 8 ? ", no memory test" : ""); 698 699 vmode = (nvram[14] << 8) || nvram[15]; 700 seq_printf(seq, 701 "Video mode : %s colors, %d columns, %s %s monitor\n", 702 colors[vmode & 7], 703 vmode & 8 ? 80 : 40, 704 vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); 705 seq_printf(seq, " %soverscan, compat. mode %s%s\n", 706 vmode & 64 ? "" : "no ", 707 vmode & 128 ? "on" : "off", 708 vmode & 256 ? 709 (vmode & 16 ? ", line doubling" : ", half screen") : ""); 710 711 return; 712 } 713 #endif 714 715 #endif /* MACH == ATARI */ 716 717 MODULE_LICENSE("GPL"); 718 MODULE_ALIAS_MISCDEV(NVRAM_MINOR); 719