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