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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [char/] [nvram.c] - Blame information for rev 62

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/*
 * 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 dependent 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/smp_lock.h>
#include <linux/nvram.h>
 
#define PC              1
#define ATARI           2
 
/* select machine configuration */
#if defined(CONFIG_ATARI)
#  define MACH ATARI
#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__)  /* and others?? */
#  define MACH PC
#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 == 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))
 
#define NVRAM_BYTES             50
 
/* 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 DEFINE_SPINLOCK(nvram_state_lock);
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;
}
 
static void
__nvram_set_checksum(void)
{
        mach_set_checksum();
}
 
#if 0
void
nvram_set_checksum(void)
{
        unsigned long flags;
 
        spin_lock_irqsave(&rtc_lock, flags);
        __nvram_set_checksum();
        spin_unlock_irqrestore(&rtc_lock, flags);
}
#endif  /*  0  */
 
/*
 * The are the file operation function for user access to /dev/nvram
 */
 
static loff_t nvram_llseek(struct file *file,loff_t offset, int origin )
{
        lock_kernel();
        switch (origin) {
        case 0:
                /* nothing to do */
                break;
        case 1:
                offset += file->f_pos;
                break;
        case 2:
                offset += NVRAM_BYTES;
                break;
        }
        unlock_kernel();
        return (offset >= 0) ? (file->f_pos = offset) : -EINVAL;
}
 
static ssize_t
nvram_read(struct file *file, char __user *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 __user *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 const 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=%d\n",
                    NVRAM_MINOR);
                goto out;
        }
        if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc,
                NULL)) {
                printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");
                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", NULL);
        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: %svalid\n", checksum ? "" : "not ");
 
        PRINT_PROC("# floppies     : %d\n",
            (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
        PRINT_PROC("Floppy 0 type  : ");
        type = nvram[2] >> 4;
        if (type < ARRAY_SIZE(floppy_types))
                PRINT_PROC("%s\n", floppy_types[type]);
        else
                PRINT_PROC("%d (unknown)\n", type);
        PRINT_PROC("Floppy 1 type  : ");
        type = nvram[2] & 0x0f;
        if (type < ARRAY_SIZE(floppy_types))
                PRINT_PROC("%s\n", floppy_types[type]);
        else
                PRINT_PROC("%d (unknown)\n", type);
 
        PRINT_PROC("HD 0 type      : ");
        type = nvram[4] >> 4;
        if (type)
                PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type);
        else
                PRINT_PROC("none\n");
 
        PRINT_PROC("HD 1 type      : ");
        type = nvram[4] & 0x0f;
        if (type)
                PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type);
        else
                PRINT_PROC("none\n");
 
        PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
            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 %d\n",
            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 kB\n", 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    : %s\n", gfx_types[(nvram[6] >> 4) & 3]);
 
        PRINT_PROC("FPU            : %sinstalled\n",
            (nvram[6] & 2) ? "" : "not ");
 
        return 1;
}
#endif
 
#endif /* MACH == PC */
 
#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", "??", "??", "??"
};
 
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  : %svalid\n", checksum ? "" : "not ");
 
        PRINT_PROC("Boot preference  : ");
        for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) {
                if (nvram[1] == boot_prefs[i].val) {
                        PRINT_PROC("%s\n", boot_prefs[i].name);
                        break;
                }
        }
        if (i < 0)
                PRINT_PROC("0x%02x (undefined)\n", nvram[1]);
 
        PRINT_PROC("SCSI arbitration : %s\n",
            (nvram[16] & 0x80) ? "on" : "off");
        PRINT_PROC("SCSI host ID     : ");
        if (nvram[16] & 0x80)
                PRINT_PROC("%d\n", nvram[16] & 7);
        else
                PRINT_PROC("n/a\n");
 
        /* 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] < ARRAY_SIZE(languages))
                PRINT_PROC("%s\n", languages[nvram[6]]);
        else
                PRINT_PROC("%u (undefined)\n", nvram[6]);
        PRINT_PROC("Keyboard language: ");
        if (nvram[7] < ARRAY_SIZE(languages))
                PRINT_PROC("%s\n", 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 clock\n", nvram[8] & 16 ? 24 : 12);
        PRINT_PROC("Boot delay       : ");
        if (nvram[10] == 0)
                PRINT_PROC("default");
        else
                PRINT_PROC("%ds%s\n", nvram[10],
                    nvram[10] < 8 ? ", no memory test" : "");
 
        vmode = (nvram[14] << 8) || nvram[15];
        PRINT_PROC("Video mode       : %s colors, %d columns, %s %s monitor\n",
            colors[vmode & 7],
            vmode & 8 ? 80 : 40,
            vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
        PRINT_PROC("                   %soverscan, compat. mode %s%s\n",
            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);
MODULE_ALIAS_MISCDEV(NVRAM_MINOR);

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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [char/] [nvram.c] - Blame information for rev 62

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
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			`*/`
36
37			`#define NVRAM_VERSION "1.2"`
38
39			`#include <linux/module.h>`
40			`#include <linux/smp_lock.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 others?? */`
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/slab.h>`
104			`#include <linux/ioport.h>`
105			`#include <linux/fcntl.h>`
106			`#include <linux/mc146818rtc.h>`
107			`#include <linux/init.h>`
108			`#include <linux/proc_fs.h>`
109			`#include <linux/spinlock.h>`
110
111			`#include <asm/io.h>`
112			`#include <asm/uaccess.h>`
113			`#include <asm/system.h>`
114
115			`static DEFINE_SPINLOCK(nvram_state_lock);`
116			`static int nvram_open_cnt; /* #times opened */`
117			`static int nvram_open_mode; /* special open modes */`
118			`#define NVRAM_WRITE 1 /* opened for writing (exclusive) */`
119			`#define NVRAM_EXCL 2 /* opened with O_EXCL */`
120
121			`static int mach_check_checksum(void);`
122			`static void mach_set_checksum(void);`
123
124			`#ifdef CONFIG_PROC_FS`
125			`static int mach_proc_infos(unsigned char contents, char buffer, int *len,`
126			`off_t *begin, off_t offset, int size);`
127			`#endif`
128
129			`/*`
130			`* These functions are provided to be called internally or by other parts of`
131			`* the kernel. It's up to the caller to ensure correct checksum before reading`
132			`* or after writing (needs to be done only once).`
133			`*`
134			`* It is worth noting that these functions all access bytes of general`
135			`* purpose memory in the NVRAM - that is to say, they all add the`
136			`* NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not`
137			`* know about the RTC cruft.`
138			`*/`
139
140			`unsigned char`
141			`__nvram_read_byte(int i)`
142			`{`
143			`return CMOS_READ(NVRAM_FIRST_BYTE + i);`
144			`}`
145
146			`unsigned char`
147			`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
158			`/* This races nicely with trying to read with checksum checking (nvram_read) */`
159			`void`
160			`__nvram_write_byte(unsigned char c, int i)`
161			`{`
162			`CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);`
163			`}`
164
165			`void`
166			`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
175			`int`
176			`__nvram_check_checksum(void)`
177			`{`
178			`return mach_check_checksum();`
179			`}`
180
181			`int`
182			`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
193			`static void`
194			`__nvram_set_checksum(void)`
195			`{`
196			`mach_set_checksum();`
197			`}`
198
199			`#if 0`
200			`void`
201			`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`
234			`nvram_read(struct file file, char __user buf, 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`
263			`nvram_write(struct file file, const char __user buf, 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`
296			`nvram_ioctl(struct inode inode, struct file file,`
297			`unsigned int cmd, unsigned long arg)`
298			`{`
299			`int i;`
300
301			`switch (cmd) {`
302
303			`case NVRAM_INIT:`
304			`/* initialize NVRAM contents and checksum */`
305			`if (!capable(CAP_SYS_ADMIN))`
306			`return -EACCES;`
307
308			`spin_lock_irq(&rtc_lock);`
309
310			`for (i = 0; i < NVRAM_BYTES; ++i)`
311			`__nvram_write_byte(0, i);`
312			`__nvram_set_checksum();`
313
314			`spin_unlock_irq(&rtc_lock);`
315			`return 0;`
316
317			`case NVRAM_SETCKS:`
318			`/* just set checksum, contents unchanged (maybe useful after`
319			`* checksum garbaged somehow...) */`
320			`if (!capable(CAP_SYS_ADMIN))`
321			`return -EACCES;`
322
323			`spin_lock_irq(&rtc_lock);`
324			`__nvram_set_checksum();`
325			`spin_unlock_irq(&rtc_lock);`
326			`return 0;`
327
328			`default:`
329			`return -ENOTTY;`
330			`}`
331			`}`
332
333			`static int`
334			`nvram_open(struct inode inode, struct file file)`
335			`{`
336			`spin_lock(&nvram_state_lock);`
337
338			`if ((nvram_open_cnt && (file->f_flags & O_EXCL)) \|\|`
339			`(nvram_open_mode & NVRAM_EXCL) \|\|`
340			`((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) {`
341			`spin_unlock(&nvram_state_lock);`
342			`return -EBUSY;`
343			`}`
344
345			`if (file->f_flags & O_EXCL)`
346			`nvram_open_mode \|= NVRAM_EXCL;`
347			`if (file->f_mode & 2)`
348			`nvram_open_mode \|= NVRAM_WRITE;`
349			`nvram_open_cnt++;`
350
351			`spin_unlock(&nvram_state_lock);`
352
353			`return 0;`
354			`}`
355
356			`static int`
357			`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 & 2)`
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`
376			`nvram_read_proc(char buffer, char *start, off_t offset,`
377			`int size, int eof, void data)`
378			`{`
379			`return 0;`
380			`}`
381			`#else`
382
383			`static int`
384			`nvram_read_proc(char buffer, char *start, off_t offset,`
385			`int size, int eof, void data)`
386			`{`
387			`unsigned char contents[NVRAM_BYTES];`
388			`int i, len = 0;`
389			`off_t begin = 0;`
390
391			`spin_lock_irq(&rtc_lock);`
392			`for (i = 0; i < NVRAM_BYTES; ++i)`
393			`contents[i] = __nvram_read_byte(i);`
394			`spin_unlock_irq(&rtc_lock);`
395
396			`*eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size);`
397
398			`if (offset >= begin + len)`
399			`return 0;`
400			`*start = buffer + (offset - begin);`
401			`return (size < begin + len - offset) ? size : begin + len - offset;`
402
403			`}`
404
405			`/* This macro frees the machine specific function from bounds checking and`
406			`* this like that... */`
407			`#define PRINT_PROC(fmt,args...) \`
408			`do { \`
409			`len += sprintf(buffer+len, fmt, ##args); \`
410			`if (begin + len > offset + size) \`
411			`return 0; \`
412			`if (begin + len < offset) { \`
413			`begin += len; \`
414			`*len = 0; \`
415			`} \`
416			`} while(0)`
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`
437			`nvram_init(void)`
438			`{`
439			`int ret;`
440
441			`/* First test whether the driver should init at all */`
442			`if (!CHECK_DRIVER_INIT())`
443			`return -ENXIO;`
444
445			`ret = misc_register(&nvram_dev);`
446			`if (ret) {`
447			`printk(KERN_ERR "nvram: can't misc_register on minor=%d\n",`
448			`NVRAM_MINOR);`
449			`goto out;`
450			`}`
451			`if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc,`
452			`NULL)) {`
453			`printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");`
454			`ret = -ENOMEM;`
455			`goto outmisc;`
456			`}`
457			`ret = 0;`
458			`printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n");`
459			`out:`
460			`return ret;`
461			`outmisc:`
462			`misc_deregister(&nvram_dev);`
463			`goto out;`
464			`}`
465
466			`static void __exit`
467			`nvram_cleanup_module(void)`
468			`{`
469			`remove_proc_entry("driver/nvram", NULL);`
470			`misc_deregister(&nvram_dev);`
471			`}`
472
473			`module_init(nvram_init);`
474			`module_exit(nvram_cleanup_module);`
475
476			`/*`
477			`* Machine specific functions`
478			`*/`
479
480			`#if MACH == PC`
481
482			`static int`
483			`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`
497			`pc_set_checksum(void)`
498			`{`
499			`int i;`
500			`unsigned short sum = 0;`
501
502			`for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)`
503			`sum += __nvram_read_byte(i);`
504			`__nvram_write_byte(sum >> 8, PC_CKS_LOC);`
505			`__nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1);`
506			`}`
507
508			`#ifdef CONFIG_PROC_FS`
509
510			`static char *floppy_types[] = {`
511			`"none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M",`
512			`"3.5'' 2.88M", "3.5'' 2.88M"`
513			`};`
514
515			`static char *gfx_types[] = {`
516			`"EGA, VGA, ... (with BIOS)",`
517			`"CGA (40 cols)",`
518			`"CGA (80 cols)",`
519			`"monochrome",`
520			`};`
521
522			`static int`
523			`pc_proc_infos(unsigned char nvram, char buffer, int *len,`
524			`off_t *begin, off_t offset, int size)`
525			`{`
526			`int checksum;`
527			`int type;`
528
529			`spin_lock_irq(&rtc_lock);`
530			`checksum = __nvram_check_checksum();`
531			`spin_unlock_irq(&rtc_lock);`
532
533			`PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");`
534
535			`PRINT_PROC("# floppies : %d\n",`
536			`(nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);`
537			`PRINT_PROC("Floppy 0 type : ");`
538			`type = nvram[2] >> 4;`
539			`if (type < ARRAY_SIZE(floppy_types))`
540			`PRINT_PROC("%s\n", floppy_types[type]);`
541			`else`
542			`PRINT_PROC("%d (unknown)\n", type);`
543			`PRINT_PROC("Floppy 1 type : ");`
544			`type = nvram[2] & 0x0f;`
545			`if (type < ARRAY_SIZE(floppy_types))`
546			`PRINT_PROC("%s\n", floppy_types[type]);`
547			`else`
548			`PRINT_PROC("%d (unknown)\n", type);`
549
550			`PRINT_PROC("HD 0 type : ");`
551			`type = nvram[4] >> 4;`
552			`if (type)`
553			`PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type);`
554			`else`
555			`PRINT_PROC("none\n");`
556
557			`PRINT_PROC("HD 1 type : ");`
558			`type = nvram[4] & 0x0f;`
559			`if (type)`
560			`PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type);`
561			`else`
562			`PRINT_PROC("none\n");`
563
564			`PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",`
565			`nvram[18] \| (nvram[19] << 8),`
566			`nvram[20], nvram[25],`
567			`nvram[21] \| (nvram[22] << 8), nvram[23] \| (nvram[24] << 8));`
568			`PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",`
569			`nvram[39] \| (nvram[40] << 8),`
570			`nvram[41], nvram[46],`
571			`nvram[42] \| (nvram[43] << 8), nvram[44] \| (nvram[45] << 8));`
572
573			`PRINT_PROC("DOS base memory: %d kB\n", nvram[7] \| (nvram[8] << 8));`
574			`PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n",`
575			`nvram[9] \| (nvram[10] << 8), nvram[34] \| (nvram[35] << 8));`
576
577			`PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]);`
578
579			`PRINT_PROC("FPU : %sinstalled\n",`
580			`(nvram[6] & 2) ? "" : "not ");`
581
582			`return 1;`
583			`}`
584			`#endif`
585
586			`#endif /* MACH == PC */`
587
588			`#if MACH == ATARI`
589
590			`static int`
591			`atari_check_checksum(void)`
592			`{`
593			`int i;`
594			`unsigned char sum = 0;`
595
596			`for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)`
597			`sum += __nvram_read_byte(i);`
598			`return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) &&`
599			`__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));`
600			`}`
601
602			`static void`
603			`atari_set_checksum(void)`
604			`{`
605			`int i;`
606			`unsigned char sum = 0;`
607
608			`for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)`
609			`sum += __nvram_read_byte(i);`
610			`__nvram_write_byte(~sum, ATARI_CKS_LOC);`
611			`__nvram_write_byte(sum, ATARI_CKS_LOC + 1);`
612			`}`
613
614			`#ifdef CONFIG_PROC_FS`
615
616			`static struct {`
617			`unsigned char val;`
618			`char *name;`
619			`} boot_prefs[] = {`
620			`{ 0x80, "TOS" },`
621			`{ 0x40, "ASV" },`
622			`{ 0x20, "NetBSD (?)" },`
623			`{ 0x10, "Linux" },`
624			`{ 0x00, "unspecified" }`
625			`};`
626
627			`static char *languages[] = {`
628			`"English (US)",`
629			`"German",`
630			`"French",`
631			`"English (UK)",`
632			`"Spanish",`
633			`"Italian",`
634			`"6 (undefined)",`
635			`"Swiss (French)",`
636			`"Swiss (German)"`
637			`};`
638
639			`static char *dateformat[] = {`
640			`"MM%cDD%cYY",`
641			`"DD%cMM%cYY",`
642			`"YY%cMM%cDD",`
643			`"YY%cDD%cMM",`
644			`"4 (undefined)",`
645			`"5 (undefined)",`
646			`"6 (undefined)",`
647			`"7 (undefined)"`
648			`};`
649
650			`static char *colors[] = {`
651			`"2", "4", "16", "256", "65536", "??", "??", "??"`
652			`};`
653
654			`static int`
655			`atari_proc_infos(unsigned char nvram, char buffer, int *len,`
656			`off_t *begin, off_t offset, int size)`
657			`{`
658			`int checksum = nvram_check_checksum();`
659			`int i;`
660			`unsigned vmode;`
661
662			`PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not ");`
663
664			`PRINT_PROC("Boot preference : ");`
665			`for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) {`
666			`if (nvram[1] == boot_prefs[i].val) {`
667			`PRINT_PROC("%s\n", boot_prefs[i].name);`
668			`break;`
669			`}`
670			`}`
671			`if (i < 0)`
672			`PRINT_PROC("0x%02x (undefined)\n", nvram[1]);`
673
674			`PRINT_PROC("SCSI arbitration : %s\n",`
675			`(nvram[16] & 0x80) ? "on" : "off");`
676			`PRINT_PROC("SCSI host ID : ");`
677			`if (nvram[16] & 0x80)`
678			`PRINT_PROC("%d\n", nvram[16] & 7);`
679			`else`
680			`PRINT_PROC("n/a\n");`
681
682			`/* the following entries are defined only for the Falcon */`
683			`if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)`
684			`return 1;`
685
686			`PRINT_PROC("OS language : ");`
687			`if (nvram[6] < ARRAY_SIZE(languages))`
688			`PRINT_PROC("%s\n", languages[nvram[6]]);`
689			`else`
690			`PRINT_PROC("%u (undefined)\n", nvram[6]);`
691			`PRINT_PROC("Keyboard language: ");`
692			`if (nvram[7] < ARRAY_SIZE(languages))`
693			`PRINT_PROC("%s\n", languages[nvram[7]]);`
694			`else`
695			`PRINT_PROC("%u (undefined)\n", nvram[7]);`
696			`PRINT_PROC("Date format : ");`
697			`PRINT_PROC(dateformat[nvram[8] & 7],`
698			`nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');`
699			`PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12);`
700			`PRINT_PROC("Boot delay : ");`
701			`if (nvram[10] == 0)`
702			`PRINT_PROC("default");`
703			`else`
704			`PRINT_PROC("%ds%s\n", nvram[10],`
705			`nvram[10] < 8 ? ", no memory test" : "");`
706
707			`vmode = (nvram[14] << 8) \|\| nvram[15];`
708			`PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n",`
709			`colors[vmode & 7],`
710			`vmode & 8 ? 80 : 40,`
711			`vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");`
712			`PRINT_PROC(" %soverscan, compat. mode %s%s\n",`
713			`vmode & 64 ? "" : "no ",`
714			`vmode & 128 ? "on" : "off",`
715			`vmode & 256 ?`
716			`(vmode & 16 ? ", line doubling" : ", half screen") : "");`
717
718			`return 1;`
719			`}`
720			`#endif`
721
722			`#endif /* MACH == ATARI */`
723
724			`MODULE_LICENSE("GPL");`
725
726			`EXPORT_SYMBOL(__nvram_read_byte);`
727			`EXPORT_SYMBOL(nvram_read_byte);`
728			`EXPORT_SYMBOL(__nvram_write_byte);`
729			`EXPORT_SYMBOL(nvram_write_byte);`
730			`EXPORT_SYMBOL(__nvram_check_checksum);`
731			`EXPORT_SYMBOL(nvram_check_checksum);`
732			`MODULE_ALIAS_MISCDEV(NVRAM_MINOR);`