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 long nvram_ioctl(struct file *file, unsigned int cmd, 300 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 lock_kernel(); 312 spin_lock_irq(&rtc_lock); 313 314 for (i = 0; i < NVRAM_BYTES; ++i) 315 __nvram_write_byte(0, i); 316 __nvram_set_checksum(); 317 318 spin_unlock_irq(&rtc_lock); 319 unlock_kernel(); 320 return 0; 321 322 case NVRAM_SETCKS: 323 /* just set checksum, contents unchanged (maybe useful after 324 * checksum garbaged somehow...) */ 325 if (!capable(CAP_SYS_ADMIN)) 326 return -EACCES; 327 328 lock_kernel(); 329 spin_lock_irq(&rtc_lock); 330 __nvram_set_checksum(); 331 spin_unlock_irq(&rtc_lock); 332 unlock_kernel(); 333 return 0; 334 335 default: 336 return -ENOTTY; 337 } 338 } 339 340 static int nvram_open(struct inode *inode, struct file *file) 341 { 342 spin_lock(&nvram_state_lock); 343 344 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || 345 (nvram_open_mode & NVRAM_EXCL) || 346 ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) { 347 spin_unlock(&nvram_state_lock); 348 return -EBUSY; 349 } 350 351 if (file->f_flags & O_EXCL) 352 nvram_open_mode |= NVRAM_EXCL; 353 if (file->f_mode & FMODE_WRITE) 354 nvram_open_mode |= NVRAM_WRITE; 355 nvram_open_cnt++; 356 357 spin_unlock(&nvram_state_lock); 358 359 return 0; 360 } 361 362 static int nvram_release(struct inode *inode, struct file *file) 363 { 364 spin_lock(&nvram_state_lock); 365 366 nvram_open_cnt--; 367 368 /* if only one instance is open, clear the EXCL bit */ 369 if (nvram_open_mode & NVRAM_EXCL) 370 nvram_open_mode &= ~NVRAM_EXCL; 371 if (file->f_mode & FMODE_WRITE) 372 nvram_open_mode &= ~NVRAM_WRITE; 373 374 spin_unlock(&nvram_state_lock); 375 376 return 0; 377 } 378 379 #ifndef CONFIG_PROC_FS 380 static int nvram_add_proc_fs(void) 381 { 382 return 0; 383 } 384 385 #else 386 387 static int nvram_proc_read(struct seq_file *seq, void *offset) 388 { 389 unsigned char contents[NVRAM_BYTES]; 390 int i = 0; 391 392 spin_lock_irq(&rtc_lock); 393 for (i = 0; i < NVRAM_BYTES; ++i) 394 contents[i] = __nvram_read_byte(i); 395 spin_unlock_irq(&rtc_lock); 396 397 mach_proc_infos(contents, seq, offset); 398 399 return 0; 400 } 401 402 static int nvram_proc_open(struct inode *inode, struct file *file) 403 { 404 return single_open(file, nvram_proc_read, NULL); 405 } 406 407 static const struct file_operations nvram_proc_fops = { 408 .owner = THIS_MODULE, 409 .open = nvram_proc_open, 410 .read = seq_read, 411 .llseek = seq_lseek, 412 .release = single_release, 413 }; 414 415 static int nvram_add_proc_fs(void) 416 { 417 if (!proc_create("driver/nvram", 0, NULL, &nvram_proc_fops)) 418 return -ENOMEM; 419 return 0; 420 } 421 422 #endif /* CONFIG_PROC_FS */ 423 424 static const struct file_operations nvram_fops = { 425 .owner = THIS_MODULE, 426 .llseek = nvram_llseek, 427 .read = nvram_read, 428 .write = nvram_write, 429 .unlocked_ioctl = nvram_ioctl, 430 .open = nvram_open, 431 .release = nvram_release, 432 }; 433 434 static struct miscdevice nvram_dev = { 435 NVRAM_MINOR, 436 "nvram", 437 &nvram_fops 438 }; 439 440 static int __init nvram_init(void) 441 { 442 int ret; 443 444 /* First test whether the driver should init at all */ 445 if (!CHECK_DRIVER_INIT()) 446 return -ENODEV; 447 448 ret = misc_register(&nvram_dev); 449 if (ret) { 450 printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", 451 NVRAM_MINOR); 452 goto out; 453 } 454 ret = nvram_add_proc_fs(); 455 if (ret) { 456 printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); 457 goto outmisc; 458 } 459 ret = 0; 460 printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); 461 out: 462 return ret; 463 outmisc: 464 misc_deregister(&nvram_dev); 465 goto out; 466 } 467 468 static void __exit nvram_cleanup_module(void) 469 { 470 remove_proc_entry("driver/nvram", NULL); 471 misc_deregister(&nvram_dev); 472 } 473 474 module_init(nvram_init); 475 module_exit(nvram_cleanup_module); 476 477 /* 478 * Machine specific functions 479 */ 480 481 #if MACH == PC 482 483 static int pc_check_checksum(void) 484 { 485 int i; 486 unsigned short sum = 0; 487 unsigned short expect; 488 489 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) 490 sum += __nvram_read_byte(i); 491 expect = __nvram_read_byte(PC_CKS_LOC)<<8 | 492 __nvram_read_byte(PC_CKS_LOC+1); 493 return (sum & 0xffff) == expect; 494 } 495 496 static void pc_set_checksum(void) 497 { 498 int i; 499 unsigned short sum = 0; 500 501 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) 502 sum += __nvram_read_byte(i); 503 __nvram_write_byte(sum >> 8, PC_CKS_LOC); 504 __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); 505 } 506 507 #ifdef CONFIG_PROC_FS 508 509 static char *floppy_types[] = { 510 "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", 511 "3.5'' 2.88M", "3.5'' 2.88M" 512 }; 513 514 static char *gfx_types[] = { 515 "EGA, VGA, ... (with BIOS)", 516 "CGA (40 cols)", 517 "CGA (80 cols)", 518 "monochrome", 519 }; 520 521 static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq, 522 void *offset) 523 { 524 int checksum; 525 int type; 526 527 spin_lock_irq(&rtc_lock); 528 checksum = __nvram_check_checksum(); 529 spin_unlock_irq(&rtc_lock); 530 531 seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not "); 532 533 seq_printf(seq, "# floppies : %d\n", 534 (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); 535 seq_printf(seq, "Floppy 0 type : "); 536 type = nvram[2] >> 4; 537 if (type < ARRAY_SIZE(floppy_types)) 538 seq_printf(seq, "%s\n", floppy_types[type]); 539 else 540 seq_printf(seq, "%d (unknown)\n", type); 541 seq_printf(seq, "Floppy 1 type : "); 542 type = nvram[2] & 0x0f; 543 if (type < ARRAY_SIZE(floppy_types)) 544 seq_printf(seq, "%s\n", floppy_types[type]); 545 else 546 seq_printf(seq, "%d (unknown)\n", type); 547 548 seq_printf(seq, "HD 0 type : "); 549 type = nvram[4] >> 4; 550 if (type) 551 seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type); 552 else 553 seq_printf(seq, "none\n"); 554 555 seq_printf(seq, "HD 1 type : "); 556 type = nvram[4] & 0x0f; 557 if (type) 558 seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type); 559 else 560 seq_printf(seq, "none\n"); 561 562 seq_printf(seq, "HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", 563 nvram[18] | (nvram[19] << 8), 564 nvram[20], nvram[25], 565 nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); 566 seq_printf(seq, "HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", 567 nvram[39] | (nvram[40] << 8), 568 nvram[41], nvram[46], 569 nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); 570 571 seq_printf(seq, "DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); 572 seq_printf(seq, "Extended memory: %d kB (configured), %d kB (tested)\n", 573 nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); 574 575 seq_printf(seq, "Gfx adapter : %s\n", 576 gfx_types[(nvram[6] >> 4) & 3]); 577 578 seq_printf(seq, "FPU : %sinstalled\n", 579 (nvram[6] & 2) ? "" : "not "); 580 581 return; 582 } 583 #endif 584 585 #endif /* MACH == PC */ 586 587 #if MACH == ATARI 588 589 static int atari_check_checksum(void) 590 { 591 int i; 592 unsigned char sum = 0; 593 594 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) 595 sum += __nvram_read_byte(i); 596 return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) && 597 (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); 598 } 599 600 static void atari_set_checksum(void) 601 { 602 int i; 603 unsigned char sum = 0; 604 605 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) 606 sum += __nvram_read_byte(i); 607 __nvram_write_byte(~sum, ATARI_CKS_LOC); 608 __nvram_write_byte(sum, ATARI_CKS_LOC + 1); 609 } 610 611 #ifdef CONFIG_PROC_FS 612 613 static struct { 614 unsigned char val; 615 char *name; 616 } boot_prefs[] = { 617 { 0x80, "TOS" }, 618 { 0x40, "ASV" }, 619 { 0x20, "NetBSD (?)" }, 620 { 0x10, "Linux" }, 621 { 0x00, "unspecified" } 622 }; 623 624 static char *languages[] = { 625 "English (US)", 626 "German", 627 "French", 628 "English (UK)", 629 "Spanish", 630 "Italian", 631 "6 (undefined)", 632 "Swiss (French)", 633 "Swiss (German)" 634 }; 635 636 static char *dateformat[] = { 637 "MM%cDD%cYY", 638 "DD%cMM%cYY", 639 "YY%cMM%cDD", 640 "YY%cDD%cMM", 641 "4 (undefined)", 642 "5 (undefined)", 643 "6 (undefined)", 644 "7 (undefined)" 645 }; 646 647 static char *colors[] = { 648 "2", "4", "16", "256", "65536", "??", "??", "??" 649 }; 650 651 static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq, 652 void *offset) 653 { 654 int checksum = nvram_check_checksum(); 655 int i; 656 unsigned vmode; 657 658 seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not "); 659 660 seq_printf(seq, "Boot preference : "); 661 for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) { 662 if (nvram[1] == boot_prefs[i].val) { 663 seq_printf(seq, "%s\n", boot_prefs[i].name); 664 break; 665 } 666 } 667 if (i < 0) 668 seq_printf(seq, "0x%02x (undefined)\n", nvram[1]); 669 670 seq_printf(seq, "SCSI arbitration : %s\n", 671 (nvram[16] & 0x80) ? "on" : "off"); 672 seq_printf(seq, "SCSI host ID : "); 673 if (nvram[16] & 0x80) 674 seq_printf(seq, "%d\n", nvram[16] & 7); 675 else 676 seq_printf(seq, "n/a\n"); 677 678 /* the following entries are defined only for the Falcon */ 679 if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) 680 return; 681 682 seq_printf(seq, "OS language : "); 683 if (nvram[6] < ARRAY_SIZE(languages)) 684 seq_printf(seq, "%s\n", languages[nvram[6]]); 685 else 686 seq_printf(seq, "%u (undefined)\n", nvram[6]); 687 seq_printf(seq, "Keyboard language: "); 688 if (nvram[7] < ARRAY_SIZE(languages)) 689 seq_printf(seq, "%s\n", languages[nvram[7]]); 690 else 691 seq_printf(seq, "%u (undefined)\n", nvram[7]); 692 seq_printf(seq, "Date format : "); 693 seq_printf(seq, dateformat[nvram[8] & 7], 694 nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); 695 seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12); 696 seq_printf(seq, "Boot delay : "); 697 if (nvram[10] == 0) 698 seq_printf(seq, "default"); 699 else 700 seq_printf(seq, "%ds%s\n", nvram[10], 701 nvram[10] < 8 ? ", no memory test" : ""); 702 703 vmode = (nvram[14] << 8) || nvram[15]; 704 seq_printf(seq, 705 "Video mode : %s colors, %d columns, %s %s monitor\n", 706 colors[vmode & 7], 707 vmode & 8 ? 80 : 40, 708 vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); 709 seq_printf(seq, " %soverscan, compat. mode %s%s\n", 710 vmode & 64 ? "" : "no ", 711 vmode & 128 ? "on" : "off", 712 vmode & 256 ? 713 (vmode & 16 ? ", line doubling" : ", half screen") : ""); 714 715 return; 716 } 717 #endif 718 719 #endif /* MACH == ATARI */ 720 721 MODULE_LICENSE("GPL"); 722 MODULE_ALIAS_MISCDEV(NVRAM_MINOR); 723