nvram.c
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上传日期:2013-04-10
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文件大小:22k
- /*
- * CMOS/NV-RAM driver for Linux
- *
- * Copyright (C) 1997 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
- * idea by and with help from Richard Jelinek <rj@suse.de>
- * Portions copyright (c) 2001,2002 Sun Microsystems (thockin@sun.com)
- *
- * This driver allows you to access the contents of the non-volatile memory in
- * the mc146818rtc.h real-time clock. This chip is built into all PCs and into
- * many Atari machines. In the former it's called "CMOS-RAM", in the latter
- * "NVRAM" (NV stands for non-volatile).
- *
- * The data are supplied as a (seekable) character device, /dev/nvram. The
- * size of this file is dependant on the controller. The usual size is 114,
- * the number of freely available bytes in the memory (i.e., not used by the
- * RTC itself).
- *
- * Checksums over the NVRAM contents are managed by this driver. In case of a
- * bad checksum, reads and writes return -EIO. The checksum can be initialized
- * to a sane state either by ioctl(NVRAM_INIT) (clear whole NVRAM) or
- * ioctl(NVRAM_SETCKS) (doesn't change contents, just makes checksum valid
- * again; use with care!)
- *
- * This file also provides some functions for other parts of the kernel that
- * want to access the NVRAM: nvram_{read,write,check_checksum,set_checksum}.
- * Obviously this can be used only if this driver is always configured into
- * the kernel and is not a module. Since the functions are used by some Atari
- * drivers, this is the case on the Atari.
- *
- *
- * 1.1 Cesar Barros: SMP locking fixes
- * added changelog
- * 1.2 Erik Gilling: Cobalt Networks support
- * Tim Hockin: general cleanup, Cobalt support
- */
- #define NVRAM_VERSION "1.2"
- #include <linux/module.h>
- #include <linux/config.h>
- #include <linux/sched.h>
- #include <linux/smp_lock.h>
- #include <linux/nvram.h>
- #define PC 1
- #define ATARI 2
- #define COBALT 3
- /* select machine configuration */
- #if defined(CONFIG_ATARI)
- # define MACH ATARI
- #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */
- #define MACH PC
- # if defined(CONFIG_COBALT)
- # include <linux/cobalt-nvram.h>
- # define MACH COBALT
- # else
- # define MACH PC
- # endif
- #else
- # error Cannot build nvram driver for this machine configuration.
- #endif
- #if MACH == PC
- /* RTC in a PC */
- #define CHECK_DRIVER_INIT() 1
- /* On PCs, the checksum is built only over bytes 2..31 */
- #define PC_CKS_RANGE_START 2
- #define PC_CKS_RANGE_END 31
- #define PC_CKS_LOC 32
- #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
- #define mach_check_checksum pc_check_checksum
- #define mach_set_checksum pc_set_checksum
- #define mach_proc_infos pc_proc_infos
- #endif
- #if MACH == COBALT
- #define CHECK_DRIVER_INIT() 1
- #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
- #define mach_check_checksum cobalt_check_checksum
- #define mach_set_checksum cobalt_set_checksum
- #define mach_proc_infos cobalt_proc_infos
- #endif
- #if MACH == ATARI
- /* Special parameters for RTC in Atari machines */
- #include <asm/atarihw.h>
- #include <asm/atariints.h>
- #define RTC_PORT(x) (TT_RTC_BAS + 2*(x))
- #define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK))
- /* On Ataris, the checksum is over all bytes except the checksum bytes
- * themselves; these are at the very end */
- #define ATARI_CKS_RANGE_START 0
- #define ATARI_CKS_RANGE_END 47
- #define ATARI_CKS_LOC 48
- #define mach_check_checksum atari_check_checksum
- #define mach_set_checksum atari_set_checksum
- #define mach_proc_infos atari_proc_infos
- #endif
- /* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
- * rtc_lock held. Due to the index-port/data-port design of the RTC, we
- * don't want two different things trying to get to it at once. (e.g. the
- * periodic 11 min sync from time.c vs. this driver.)
- */
- #include <linux/types.h>
- #include <linux/errno.h>
- #include <linux/miscdevice.h>
- #include <linux/slab.h>
- #include <linux/ioport.h>
- #include <linux/fcntl.h>
- #include <linux/mc146818rtc.h>
- #include <linux/init.h>
- #include <linux/proc_fs.h>
- #include <linux/spinlock.h>
- #include <asm/io.h>
- #include <asm/uaccess.h>
- #include <asm/system.h>
- static spinlock_t nvram_state_lock = SPIN_LOCK_UNLOCKED;
- static int nvram_open_cnt; /* #times opened */
- static int nvram_open_mode; /* special open modes */
- #define NVRAM_WRITE 1 /* opened for writing (exclusive) */
- #define NVRAM_EXCL 2 /* opened with O_EXCL */
- static int mach_check_checksum(void);
- static void mach_set_checksum(void);
- #ifdef CONFIG_PROC_FS
- static int mach_proc_infos(unsigned char *contents, char *buffer, int *len,
- off_t *begin, off_t offset, int size);
- #endif
- /*
- * These functions are provided to be called internally or by other parts of
- * the kernel. It's up to the caller to ensure correct checksum before reading
- * or after writing (needs to be done only once).
- *
- * It is worth noting that these functions all access bytes of general
- * purpose memory in the NVRAM - that is to say, they all add the
- * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not
- * know about the RTC cruft.
- */
- unsigned char
- __nvram_read_byte(int i)
- {
- return CMOS_READ(NVRAM_FIRST_BYTE + i);
- }
- unsigned char
- nvram_read_byte(int i)
- {
- unsigned long flags;
- unsigned char c;
- spin_lock_irqsave(&rtc_lock, flags);
- c = __nvram_read_byte(i);
- spin_unlock_irqrestore(&rtc_lock, flags);
- return c;
- }
- /* This races nicely with trying to read with checksum checking (nvram_read) */
- void
- __nvram_write_byte(unsigned char c, int i)
- {
- CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);
- }
- void
- nvram_write_byte(unsigned char c, int i)
- {
- unsigned long flags;
- spin_lock_irqsave(&rtc_lock, flags);
- __nvram_write_byte(c, i);
- spin_unlock_irqrestore(&rtc_lock, flags);
- }
- int
- __nvram_check_checksum(void)
- {
- return mach_check_checksum();
- }
- int
- nvram_check_checksum(void)
- {
- unsigned long flags;
- int rv;
- spin_lock_irqsave(&rtc_lock, flags);
- rv = __nvram_check_checksum();
- spin_unlock_irqrestore(&rtc_lock, flags);
- return rv;
- }
- void
- __nvram_set_checksum(void)
- {
- mach_set_checksum();
- }
- void
- nvram_set_checksum(void)
- {
- unsigned long flags;
- spin_lock_irqsave(&rtc_lock, flags);
- __nvram_set_checksum();
- spin_unlock_irqrestore(&rtc_lock, flags);
- }
- /*
- * The are the file operation function for user access to /dev/nvram
- */
- static long long
- nvram_llseek(struct file *file, loff_t offset, int origin)
- {
- switch (origin) {
- case 0:
- /* nothing to do */
- break;
- case 1:
- offset += file->f_pos;
- break;
- case 2:
- offset += NVRAM_BYTES;
- break;
- }
- return (offset >= 0) ? (file->f_pos = offset) : -EINVAL;
- }
- static ssize_t
- nvram_read(struct file *file, char *buf, size_t count, loff_t *ppos)
- {
- unsigned char contents[NVRAM_BYTES];
- unsigned i = *ppos;
- unsigned char *tmp;
- spin_lock_irq(&rtc_lock);
- if (!__nvram_check_checksum())
- goto checksum_err;
- for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
- *tmp = __nvram_read_byte(i);
- spin_unlock_irq(&rtc_lock);
- if (copy_to_user(buf, contents, tmp - contents))
- return -EFAULT;
- *ppos = i;
- return tmp - contents;
- checksum_err:
- spin_unlock_irq(&rtc_lock);
- return -EIO;
- }
- static ssize_t
- nvram_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
- {
- unsigned char contents[NVRAM_BYTES];
- unsigned i = *ppos;
- unsigned char *tmp;
- int len;
- len = (NVRAM_BYTES - i) < count ? (NVRAM_BYTES - i) : count;
- if (copy_from_user(contents, buf, len))
- return -EFAULT;
- spin_lock_irq(&rtc_lock);
- if (!__nvram_check_checksum())
- goto checksum_err;
- for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
- __nvram_write_byte(*tmp, i);
- __nvram_set_checksum();
- spin_unlock_irq(&rtc_lock);
- *ppos = i;
- return tmp - contents;
- checksum_err:
- spin_unlock_irq(&rtc_lock);
- return -EIO;
- }
- static int
- nvram_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
- {
- int i;
- switch (cmd) {
- case NVRAM_INIT:
- /* initialize NVRAM contents and checksum */
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
- spin_lock_irq(&rtc_lock);
- for (i = 0; i < NVRAM_BYTES; ++i)
- __nvram_write_byte(0, i);
- __nvram_set_checksum();
- spin_unlock_irq(&rtc_lock);
- return 0;
- case NVRAM_SETCKS:
- /* just set checksum, contents unchanged (maybe useful after
- * checksum garbaged somehow...) */
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
- spin_lock_irq(&rtc_lock);
- __nvram_set_checksum();
- spin_unlock_irq(&rtc_lock);
- return 0;
- default:
- return -ENOTTY;
- }
- }
- static int
- nvram_open(struct inode *inode, struct file *file)
- {
- spin_lock(&nvram_state_lock);
- if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
- (nvram_open_mode & NVRAM_EXCL) ||
- ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) {
- spin_unlock(&nvram_state_lock);
- return -EBUSY;
- }
- if (file->f_flags & O_EXCL)
- nvram_open_mode |= NVRAM_EXCL;
- if (file->f_mode & 2)
- nvram_open_mode |= NVRAM_WRITE;
- nvram_open_cnt++;
- spin_unlock(&nvram_state_lock);
- return 0;
- }
- static int
- nvram_release(struct inode *inode, struct file *file)
- {
- spin_lock(&nvram_state_lock);
- nvram_open_cnt--;
- /* if only one instance is open, clear the EXCL bit */
- if (nvram_open_mode & NVRAM_EXCL)
- nvram_open_mode &= ~NVRAM_EXCL;
- if (file->f_mode & 2)
- nvram_open_mode &= ~NVRAM_WRITE;
- spin_unlock(&nvram_state_lock);
- return 0;
- }
- #ifndef CONFIG_PROC_FS
- static int
- nvram_read_proc(char *buffer, char **start, off_t offset,
- int size, int *eof, void *data)
- {
- return 0;
- }
- #else
- static int
- nvram_read_proc(char *buffer, char **start, off_t offset,
- int size, int *eof, void *data)
- {
- unsigned char contents[NVRAM_BYTES];
- int i, len = 0;
- off_t begin = 0;
- spin_lock_irq(&rtc_lock);
- for (i = 0; i < NVRAM_BYTES; ++i)
- contents[i] = __nvram_read_byte(i);
- spin_unlock_irq(&rtc_lock);
- *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size);
- if (offset >= begin + len)
- return 0;
- *start = buffer + (offset - begin);
- return (size < begin + len - offset) ? size : begin + len - offset;
- }
- /* This macro frees the machine specific function from bounds checking and
- * this like that... */
- #define PRINT_PROC(fmt,args...)
- do {
- *len += sprintf(buffer+*len, fmt, ##args);
- if (*begin + *len > offset + size)
- return 0;
- if (*begin + *len < offset) {
- *begin += *len;
- *len = 0;
- }
- } while(0)
- #endif /* CONFIG_PROC_FS */
- static struct file_operations nvram_fops = {
- owner: THIS_MODULE,
- llseek: nvram_llseek,
- read: nvram_read,
- write: nvram_write,
- ioctl: nvram_ioctl,
- open: nvram_open,
- release: nvram_release,
- };
- static struct miscdevice nvram_dev = {
- NVRAM_MINOR,
- "nvram",
- &nvram_fops
- };
- static int __init
- nvram_init(void)
- {
- int ret;
- /* First test whether the driver should init at all */
- if (!CHECK_DRIVER_INIT())
- return -ENXIO;
- ret = misc_register(&nvram_dev);
- if (ret) {
- printk(KERN_ERR "nvram: can't misc_register on minor=%dn",
- NVRAM_MINOR);
- goto out;
- }
- if (!create_proc_read_entry("driver/nvram", 0, 0, nvram_read_proc,
- NULL)) {
- printk(KERN_ERR "nvram: can't create /proc/driver/nvramn");
- ret = -ENOMEM;
- goto outmisc;
- }
- ret = 0;
- printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "n");
- out:
- return ret;
- outmisc:
- misc_deregister(&nvram_dev);
- goto out;
- }
- static void __exit
- nvram_cleanup_module(void)
- {
- remove_proc_entry("driver/nvram", 0);
- misc_deregister(&nvram_dev);
- }
- module_init(nvram_init);
- module_exit(nvram_cleanup_module);
- /*
- * Machine specific functions
- */
- #if MACH == PC
- static int
- pc_check_checksum(void)
- {
- int i;
- unsigned short sum = 0;
- unsigned short expect;
- for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
- sum += __nvram_read_byte(i);
- expect = __nvram_read_byte(PC_CKS_LOC)<<8 |
- __nvram_read_byte(PC_CKS_LOC+1);
- return ((sum & 0xffff) == expect);
- }
- static void
- pc_set_checksum(void)
- {
- int i;
- unsigned short sum = 0;
- for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
- sum += __nvram_read_byte(i);
- __nvram_write_byte(sum >> 8, PC_CKS_LOC);
- __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1);
- }
- #ifdef CONFIG_PROC_FS
- static char *floppy_types[] = {
- "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M",
- "3.5'' 2.88M", "3.5'' 2.88M"
- };
- static char *gfx_types[] = {
- "EGA, VGA, ... (with BIOS)",
- "CGA (40 cols)",
- "CGA (80 cols)",
- "monochrome",
- };
- static int
- pc_proc_infos(unsigned char *nvram, char *buffer, int *len,
- off_t *begin, off_t offset, int size)
- {
- int checksum;
- int type;
- spin_lock_irq(&rtc_lock);
- checksum = __nvram_check_checksum();
- spin_unlock_irq(&rtc_lock);
- PRINT_PROC("Checksum status: %svalidn", checksum ? "" : "not ");
- PRINT_PROC("# floppies : %dn",
- (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
- PRINT_PROC("Floppy 0 type : ");
- type = nvram[2] >> 4;
- if (type < sizeof (floppy_types) / sizeof (*floppy_types))
- PRINT_PROC("%sn", floppy_types[type]);
- else
- PRINT_PROC("%d (unknown)n", type);
- PRINT_PROC("Floppy 1 type : ");
- type = nvram[2] & 0x0f;
- if (type < sizeof (floppy_types) / sizeof (*floppy_types))
- PRINT_PROC("%sn", floppy_types[type]);
- else
- PRINT_PROC("%d (unknown)n", type);
- PRINT_PROC("HD 0 type : ");
- type = nvram[4] >> 4;
- if (type)
- PRINT_PROC("%02xn", type == 0x0f ? nvram[11] : type);
- else
- PRINT_PROC("nonen");
- PRINT_PROC("HD 1 type : ");
- type = nvram[4] & 0x0f;
- if (type)
- PRINT_PROC("%02xn", type == 0x0f ? nvram[12] : type);
- else
- PRINT_PROC("nonen");
- PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %dn",
- nvram[18] | (nvram[19] << 8),
- nvram[20], nvram[25],
- nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8));
- PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %dn",
- nvram[39] | (nvram[40] << 8),
- nvram[41], nvram[46],
- nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8));
- PRINT_PROC("DOS base memory: %d kBn", nvram[7] | (nvram[8] << 8));
- PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)n",
- nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8));
- PRINT_PROC("Gfx adapter : %sn", gfx_types[(nvram[6] >> 4) & 3]);
- PRINT_PROC("FPU : %sinstalledn",
- (nvram[6] & 2) ? "" : "not ");
- return 1;
- }
- #endif
- #endif /* MACH == PC */
- #if MACH == COBALT
- /* the cobalt CMOS has a wider range of it's checksum */
- static int cobalt_check_checksum(void)
- {
- int i;
- unsigned short sum = 0;
- unsigned short expect;
- for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) {
- if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1)))
- continue;
- sum += __nvram_read_byte(i);
- }
- expect = __nvram_read_byte(COBT_CMOS_CHECKSUM) << 8 |
- __nvram_read_byte(COBT_CMOS_CHECKSUM+1);
- return ((sum & 0xffff) == expect);
- }
- static void cobalt_set_checksum(void)
- {
- int i;
- unsigned short sum = 0;
- for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) {
- if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1)))
- continue;
- sum += __nvram_read_byte(i);
- }
- __nvram_write_byte(sum >> 8, COBT_CMOS_CHECKSUM);
- __nvram_write_byte(sum & 0xff, COBT_CMOS_CHECKSUM+1);
- }
- #ifdef CONFIG_PROC_FS
- static int cobalt_proc_infos(unsigned char *nvram, char *buffer, int *len,
- off_t *begin, off_t offset, int size)
- {
- int i;
- unsigned int checksum;
- unsigned int flags;
- char sernum[14];
- char *key = "cNoEbTaWlOtR!";
- unsigned char bto_csum;
- spin_lock_irq(&rtc_lock);
- checksum = __nvram_check_checksum();
- spin_unlock_irq(&rtc_lock);
- PRINT_PROC("Checksum status: %svalidn", checksum ? "" : "not ");
- flags = nvram[COBT_CMOS_FLAG_BYTE_0] << 8
- | nvram[COBT_CMOS_FLAG_BYTE_1];
- PRINT_PROC("Console: %sn",
- flags & COBT_CMOS_CONSOLE_FLAG ? "on": "off");
- PRINT_PROC("Firmware Debug Messages: %sn",
- flags & COBT_CMOS_DEBUG_FLAG ? "on": "off");
- PRINT_PROC("Auto Prompt: %sn",
- flags & COBT_CMOS_AUTO_PROMPT_FLAG ? "on": "off");
- PRINT_PROC("Shutdown Status: %sn",
- flags & COBT_CMOS_CLEAN_BOOT_FLAG ? "clean": "dirty");
- PRINT_PROC("Hardware Probe: %sn",
- flags & COBT_CMOS_HW_NOPROBE_FLAG ? "partial": "full");
- PRINT_PROC("System Fault: %sdetectedn",
- flags & COBT_CMOS_SYSFAULT_FLAG ? "": "not ");
- PRINT_PROC("Panic on OOPS: %sn",
- flags & COBT_CMOS_OOPSPANIC_FLAG ? "yes": "no");
- PRINT_PROC("Delayed Cache Initialization: %sn",
- flags & COBT_CMOS_DELAY_CACHE_FLAG ? "yes": "no");
- PRINT_PROC("Show Logo at Boot: %sn",
- flags & COBT_CMOS_NOLOGO_FLAG ? "no": "yes");
- PRINT_PROC("Boot Method: ");
- switch (nvram[COBT_CMOS_BOOT_METHOD]) {
- case COBT_CMOS_BOOT_METHOD_DISK:
- PRINT_PROC("diskn");
- break;
- case COBT_CMOS_BOOT_METHOD_ROM:
- PRINT_PROC("romn");
- break;
- case COBT_CMOS_BOOT_METHOD_NET:
- PRINT_PROC("netn");
- break;
- default:
- PRINT_PROC("unknownn");
- break;
- }
- PRINT_PROC("Primary Boot Device: %d:%dn",
- nvram[COBT_CMOS_BOOT_DEV0_MAJ],
- nvram[COBT_CMOS_BOOT_DEV0_MIN] );
- PRINT_PROC("Secondary Boot Device: %d:%dn",
- nvram[COBT_CMOS_BOOT_DEV1_MAJ],
- nvram[COBT_CMOS_BOOT_DEV1_MIN] );
- PRINT_PROC("Tertiary Boot Device: %d:%dn",
- nvram[COBT_CMOS_BOOT_DEV2_MAJ],
- nvram[COBT_CMOS_BOOT_DEV2_MIN] );
- PRINT_PROC("Uptime: %dn",
- nvram[COBT_CMOS_UPTIME_0] << 24 |
- nvram[COBT_CMOS_UPTIME_1] << 16 |
- nvram[COBT_CMOS_UPTIME_2] << 8 |
- nvram[COBT_CMOS_UPTIME_3]);
- PRINT_PROC("Boot Count: %dn",
- nvram[COBT_CMOS_BOOTCOUNT_0] << 24 |
- nvram[COBT_CMOS_BOOTCOUNT_1] << 16 |
- nvram[COBT_CMOS_BOOTCOUNT_2] << 8 |
- nvram[COBT_CMOS_BOOTCOUNT_3]);
- /* 13 bytes of serial num */
- for (i=0 ; i<13 ; i++) {
- sernum[i] = nvram[COBT_CMOS_SYS_SERNUM_0 + i];
- }
- sernum[13] = ' ';
- checksum = 0;
- for (i=0 ; i<13 ; i++) {
- checksum += sernum[i] ^ key[i];
- }
- checksum = ((checksum & 0x7f) ^ (0xd6)) & 0xff;
- PRINT_PROC("Serial Number: %s", sernum);
- if (checksum != nvram[COBT_CMOS_SYS_SERNUM_CSUM]) {
- PRINT_PROC(" (invalid checksum)");
- }
- PRINT_PROC("n");
- PRINT_PROC("Rom Revison: %d.%d.%dn", nvram[COBT_CMOS_ROM_REV_MAJ],
- nvram[COBT_CMOS_ROM_REV_MIN], nvram[COBT_CMOS_ROM_REV_REV]);
- PRINT_PROC("BTO Server: %d.%d.%d.%d", nvram[COBT_CMOS_BTO_IP_0],
- nvram[COBT_CMOS_BTO_IP_1], nvram[COBT_CMOS_BTO_IP_2],
- nvram[COBT_CMOS_BTO_IP_3]);
- bto_csum = nvram[COBT_CMOS_BTO_IP_0] + nvram[COBT_CMOS_BTO_IP_1]
- + nvram[COBT_CMOS_BTO_IP_2] + nvram[COBT_CMOS_BTO_IP_3];
- if (bto_csum != nvram[COBT_CMOS_BTO_IP_CSUM]) {
- PRINT_PROC(" (invalid checksum)");
- }
- PRINT_PROC("n");
- if (flags & COBT_CMOS_VERSION_FLAG
- && nvram[COBT_CMOS_VERSION] >= COBT_CMOS_VER_BTOCODE) {
- PRINT_PROC("BTO Code: 0x%xn",
- nvram[COBT_CMOS_BTO_CODE_0] << 24 |
- nvram[COBT_CMOS_BTO_CODE_1] << 16 |
- nvram[COBT_CMOS_BTO_CODE_2] << 8 |
- nvram[COBT_CMOS_BTO_CODE_3]);
- }
- return 1;
- }
- #endif /* CONFIG_PROC_FS */
- #endif /* MACH == COBALT */
- #if MACH == ATARI
- static int
- atari_check_checksum(void)
- {
- int i;
- unsigned char sum = 0;
- for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
- sum += __nvram_read_byte(i);
- return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) &&
- __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
- }
- static void
- atari_set_checksum(void)
- {
- int i;
- unsigned char sum = 0;
- for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
- sum += __nvram_read_byte(i);
- __nvram_write_byte(~sum, ATARI_CKS_LOC);
- __nvram_write_byte(sum, ATARI_CKS_LOC + 1);
- }
- #ifdef CONFIG_PROC_FS
- static struct {
- unsigned char val;
- char *name;
- } boot_prefs[] = {
- { 0x80, "TOS" },
- { 0x40, "ASV" },
- { 0x20, "NetBSD (?)" },
- { 0x10, "Linux" },
- { 0x00, "unspecified" }
- };
- static char *languages[] = {
- "English (US)",
- "German",
- "French",
- "English (UK)",
- "Spanish",
- "Italian",
- "6 (undefined)",
- "Swiss (French)",
- "Swiss (German)"
- };
- static char *dateformat[] = {
- "MM%cDD%cYY",
- "DD%cMM%cYY",
- "YY%cMM%cDD",
- "YY%cDD%cMM",
- "4 (undefined)",
- "5 (undefined)",
- "6 (undefined)",
- "7 (undefined)"
- };
- static char *colors[] = {
- "2", "4", "16", "256", "65536", "??", "??", "??"
- };
- #define fieldsize(a) (sizeof(a)/sizeof(*a))
- static int
- atari_proc_infos(unsigned char *nvram, char *buffer, int *len,
- off_t *begin, off_t offset, int size)
- {
- int checksum = nvram_check_checksum();
- int i;
- unsigned vmode;
- PRINT_PROC("Checksum status : %svalidn", checksum ? "" : "not ");
- PRINT_PROC("Boot preference : ");
- for (i = fieldsize(boot_prefs) - 1; i >= 0; --i) {
- if (nvram[1] == boot_prefs[i].val) {
- PRINT_PROC("%sn", boot_prefs[i].name);
- break;
- }
- }
- if (i < 0)
- PRINT_PROC("0x%02x (undefined)n", nvram[1]);
- PRINT_PROC("SCSI arbitration : %sn",
- (nvram[16] & 0x80) ? "on" : "off");
- PRINT_PROC("SCSI host ID : ");
- if (nvram[16] & 0x80)
- PRINT_PROC("%dn", nvram[16] & 7);
- else
- PRINT_PROC("n/an");
- /* the following entries are defined only for the Falcon */
- if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)
- return 1;
- PRINT_PROC("OS language : ");
- if (nvram[6] < fieldsize(languages))
- PRINT_PROC("%sn", languages[nvram[6]]);
- else
- PRINT_PROC("%u (undefined)n", nvram[6]);
- PRINT_PROC("Keyboard language: ");
- if (nvram[7] < fieldsize(languages))
- PRINT_PROC("%sn", languages[nvram[7]]);
- else
- PRINT_PROC("%u (undefined)n", nvram[7]);
- PRINT_PROC("Date format : ");
- PRINT_PROC(dateformat[nvram[8] & 7],
- nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
- PRINT_PROC(", %dh clockn", nvram[8] & 16 ? 24 : 12);
- PRINT_PROC("Boot delay : ");
- if (nvram[10] == 0)
- PRINT_PROC("default");
- else
- PRINT_PROC("%ds%sn", nvram[10],
- nvram[10] < 8 ? ", no memory test" : "");
- vmode = (nvram[14] << 8) || nvram[15];
- PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitorn",
- colors[vmode & 7],
- vmode & 8 ? 80 : 40,
- vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
- PRINT_PROC(" %soverscan, compat. mode %s%sn",
- vmode & 64 ? "" : "no ",
- vmode & 128 ? "on" : "off",
- vmode & 256 ?
- (vmode & 16 ? ", line doubling" : ", half screen") : "");
- return 1;
- }
- #endif
- #endif /* MACH == ATARI */
- MODULE_LICENSE("GPL");
- EXPORT_SYMBOL(__nvram_read_byte);
- EXPORT_SYMBOL(nvram_read_byte);
- EXPORT_SYMBOL(__nvram_write_byte);
- EXPORT_SYMBOL(nvram_write_byte);
- EXPORT_SYMBOL(__nvram_check_checksum);
- EXPORT_SYMBOL(nvram_check_checksum);
- EXPORT_SYMBOL(__nvram_set_checksum);
- EXPORT_SYMBOL(nvram_set_checksum);