Release 4.11 drivers/char/nvram.c

Directory: drivers/char
/*
 * 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
 *      1.3     Wim Van Sebroeck: convert PRINT_PROC to seq_file
 */


#define NVRAM_VERSION	"1.3"

#include <linux/module.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 ?? */

#  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 kernel/time/ntp.c vs. this driver.)
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <linux/mc146818rtc.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/mutex.h>
#include <linux/pagemap.h>


static DEFINE_MUTEX(nvram_mutex);
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 void mach_proc_infos(unsigned char *contents, struct seq_file *seq,
								void *offset);
#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);
}
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Tim Hockin 2 11.76% 1 50.00%
Total 17 100.00% 2 100.00%


EXPORT_SYMBOL(__nvram_read_byte);



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;
}
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Tim Hockin 1 2.33% 1 33.33%
Total 43 100.00% 3 100.00%


EXPORT_SYMBOL(nvram_read_byte);

/* 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);
}
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Wim Van Sebroeck 1 4.76% 1 50.00%
Total 21 100.00% 2 100.00%


EXPORT_SYMBOL(__nvram_write_byte);



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);
}
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Tim Hockin 1 2.56% 1 25.00%
Wim Van Sebroeck 1 2.56% 1 25.00%
Total 39 100.00% 4 100.00%


EXPORT_SYMBOL(nvram_write_byte);



int __nvram_check_checksum(void)
{
	return mach_check_checksum();
}
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Wim Van Sebroeck 1 9.09% 1 50.00%
Total 11 100.00% 2 100.00%


EXPORT_SYMBOL(__nvram_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;
}
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Linus Torvalds (pre-git) 36 94.74% 2 50.00%
Tim Hockin 1 2.63% 1 25.00%
Wim Van Sebroeck 1 2.63% 1 25.00%
Total 38 100.00% 4 100.00%


EXPORT_SYMBOL(nvram_check_checksum);



static void __nvram_set_checksum(void)
{
	mach_set_checksum();
}

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Tim Hockin 9 81.82% 1 33.33%
Linus Torvalds (pre-git) 1 9.09% 1 33.33%
Adrian Bunk 1 9.09% 1 33.33%
Total 11 100.00% 3 100.00%

#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)
{
	return generic_file_llseek_size(file, offset, origin, MAX_LFS_FILESIZE,
					NVRAM_BYTES);
}

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Linus Torvalds (pre-git) 18 58.06% 1 25.00%
Al Viro 10 32.26% 1 25.00%
Dave Jones 2 6.45% 1 25.00%
Josef Bacik 1 3.23% 1 25.00%
Total 31 100.00% 4 100.00%



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;
}

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Linus Torvalds (pre-git) 125 96.15% 4 66.67%
Tim Hockin 4 3.08% 1 16.67%
Al Viro 1 0.77% 1 16.67%
Total 130 100.00% 6 100.00%



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;

	if (i >= NVRAM_BYTES)
		return 0;	/* Past EOF */

	if (count > NVRAM_BYTES - i)
		count = NVRAM_BYTES - i;
	if (count > NVRAM_BYTES)
		return -EFAULT;	/* Can't happen, but prove it to gcc */

	if (copy_from_user(contents, buf, count))
		return -EFAULT;

	spin_lock_irq(&rtc_lock);

	if (!__nvram_check_checksum())
		goto checksum_err;

	for (tmp = contents; count--; ++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;
}

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Linus Torvalds (pre-git) 112 69.57% 4 57.14%
H. Peter Anvin 28 17.39% 1 14.29%
Tim Hockin 20 12.42% 1 14.29%
Al Viro 1 0.62% 1 14.29%
Total 161 100.00% 7 100.00%



static long nvram_ioctl(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;

		mutex_lock(&nvram_mutex);
		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);
		mutex_unlock(&nvram_mutex);
		return 0;

	case NVRAM_SETCKS:
		/* just set checksum, contents unchanged (maybe useful after
                 * checksum garbaged somehow...) */
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;

		mutex_lock(&nvram_mutex);
		spin_lock_irq(&rtc_lock);
		__nvram_set_checksum();
		spin_unlock_irq(&rtc_lock);
		mutex_unlock(&nvram_mutex);
		return 0;

	default:
		return -ENOTTY;
	}
}

Contributors
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Linus Torvalds (pre-git) 115 79.31% 3 37.50%
Arnd Bergmann 25 17.24% 2 25.00%
Tim Hockin 3 2.07% 1 12.50%
Rusty Russell 1 0.69% 1 12.50%
Wim Van Sebroeck 1 0.69% 1 12.50%
Total 145 100.00% 8 100.00%



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 & FMODE_WRITE) && (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 & FMODE_WRITE)
		nvram_open_mode |= NVRAM_WRITE;
	nvram_open_cnt++;

	spin_unlock(&nvram_state_lock);

	return 0;
}

Contributors
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Linus Torvalds (pre-git) 84 79.25% 1 25.00%
Linus Torvalds 17 16.04% 1 25.00%
Tim Hockin 3 2.83% 1 25.00%
Al Viro 2 1.89% 1 25.00%
Total 106 100.00% 4 100.00%



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 & FMODE_WRITE)
		nvram_open_mode &= ~NVRAM_WRITE;

	spin_unlock(&nvram_state_lock);

	return 0;
}

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Linus Torvalds (pre-git) 45 76.27% 2 40.00%
Linus Torvalds 8 13.56% 1 20.00%
Tim Hockin 5 8.47% 1 20.00%
Al Viro 1 1.69% 1 20.00%
Total 59 100.00% 5 100.00%

#ifndef CONFIG_PROC_FS


static int nvram_add_proc_fs(void)
{
	return 0;
}

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Wim Van Sebroeck 1 9.09% 1 33.33%
Total 11 100.00% 3 100.00%

#else



static int nvram_proc_read(struct seq_file *seq, void *offset)
{
	unsigned char contents[NVRAM_BYTES];
	int i = 0;

	spin_lock_irq(&rtc_lock);
	for (i = 0; i < NVRAM_BYTES; ++i)
		contents[i] = __nvram_read_byte(i);
	spin_unlock_irq(&rtc_lock);

	mach_proc_infos(contents, seq, offset);

	return 0;
}

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Linus Torvalds (pre-git) 66 89.19% 2 50.00%
Wim Van Sebroeck 7 9.46% 1 25.00%
Tim Hockin 1 1.35% 1 25.00%
Total 74 100.00% 4 100.00%



static int nvram_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, nvram_proc_read, NULL);
}

Contributors
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Wim Van Sebroeck 23 88.46% 1 50.00%
Linus Torvalds (pre-git) 3 11.54% 1 50.00%
Total 26 100.00% 2 100.00%


static const struct file_operations nvram_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= nvram_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};



static int nvram_add_proc_fs(void)
{
	if (!proc_create("driver/nvram", 0, NULL, &nvram_proc_fops))
		return -ENOMEM;
	return 0;
}

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Linus Torvalds (pre-git) 2 6.67% 1 50.00%
Total 30 100.00% 2 100.00%

#endif /* CONFIG_PROC_FS */


static const struct file_operations nvram_fops = {
	.owner		= THIS_MODULE,
	.llseek		= nvram_llseek,
	.read		= nvram_read,
	.write		= nvram_write,
	.unlocked_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 -ENODEV;

	ret = misc_register(&nvram_dev);
	if (ret) {
		printk(KERN_ERR "nvram: can't misc_register on minor=%d\n",
		    NVRAM_MINOR);
		goto out;
	}
	ret = nvram_add_proc_fs();
	if (ret) {
		printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");
		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;
}

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Wim Van Sebroeck 6 6.25% 1 16.67%
Geert Uytterhoeven 1 1.04% 1 16.67%
Total 96 100.00% 6 100.00%



static void __exit nvram_cleanup_module(void)
{
	remove_proc_entry("driver/nvram", NULL);
	misc_deregister(&nvram_dev);
}

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Al Viro 1 4.55% 1 33.33%
Total 22 100.00% 3 100.00%


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;
}

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Linus Torvalds (pre-git) 49 74.24% 1 50.00%
Tim Hockin 17 25.76% 1 50.00%
Total 66 100.00% 2 100.00%



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);
}

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Linus Torvalds (pre-git) 54 94.74% 1 50.00%
Tim Hockin 3 5.26% 1 50.00%
Total 57 100.00% 2 100.00%

#ifdef CONFIG_PROC_FS


static const char * const 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 const char * const gfx_types[] = {
	"EGA, VGA, ... (with BIOS)",
	"CGA (40 cols)",
	"CGA (80 cols)",
	"monochrome",
};



static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq,
								void *offset)
{
	int checksum;
	int type;

	spin_lock_irq(&rtc_lock);
	checksum = __nvram_check_checksum();
	spin_unlock_irq(&rtc_lock);

	seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not ");

	seq_printf(seq, "# floppies     : %d\n",
	    (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
	seq_printf(seq, "Floppy 0 type  : ");
	type = nvram[2] >> 4;
	if (type < ARRAY_SIZE(floppy_types))
		seq_printf(seq, "%s\n", floppy_types[type]);
	else
		seq_printf(seq, "%d (unknown)\n", type);
	seq_printf(seq, "Floppy 1 type  : ");
	type = nvram[2] & 0x0f;
	if (type < ARRAY_SIZE(floppy_types))
		seq_printf(seq, "%s\n", floppy_types[type]);
	else
		seq_printf(seq, "%d (unknown)\n", type);

	seq_printf(seq, "HD 0 type      : ");
	type = nvram[4] >> 4;
	if (type)
		seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type);
	else
		seq_printf(seq, "none\n");

	seq_printf(seq, "HD 1 type      : ");
	type = nvram[4] & 0x0f;
	if (type)
		seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type);
	else
		seq_printf(seq, "none\n");

	seq_printf(seq, "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));
	seq_printf(seq, "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));

	seq_printf(seq, "DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8));
	seq_printf(seq, "Extended memory: %d kB (configured), %d kB (tested)\n",
	    nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8));

	seq_printf(seq, "Gfx adapter    : %s\n",
	    gfx_types[(nvram[6] >> 4) & 3]);

	seq_printf(seq, "FPU            : %sinstalled\n",
	    (nvram[6] & 2) ? "" : "not ");

	return;
}
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Linus Torvalds (pre-git) 184 37.78% 3 50.00%
Wim Van Sebroeck 66 13.55% 1 16.67%
Tobias Klauser 2 0.41% 1 16.67%
Total 487 100.00% 6 100.00%

#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));
}

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Linus Torvalds (pre-git) 62 92.54% 1 33.33%
Tim Hockin 3 4.48% 1 33.33%
Wim Van Sebroeck 2 2.99% 1 33.33%
Total 67 100.00% 3 100.00%



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);
}

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Linus Torvalds (pre-git) 51 94.44% 1 50.00%
Tim Hockin 3 5.56% 1 50.00%
Total 54 100.00% 2 100.00%

#ifdef CONFIG_PROC_FS

static struct {
	
unsigned char val;
	
const char *name;
} 
boot_prefs[] = {
	{ 0x80, "TOS" },
	{ 0x40, "ASV" },
	{ 0x20, "NetBSD (?)" },
	{ 0x10, "Linux" },
	{ 0x00, "unspecified" }
};


static const char * const languages[] = {
	"English (US)",
	"German",
	"French",
	"English (UK)",
	"Spanish",
	"Italian",
	"6 (undefined)",
	"Swiss (French)",
	"Swiss (German)"
};


static const char * const dateformat[] = {
	"MM%cDD%cYY",
	"DD%cMM%cYY",
	"YY%cMM%cDD",
	"YY%cDD%cMM",
	"4 (undefined)",
	"5 (undefined)",
	"6 (undefined)",
	"7 (undefined)"
};


static const char * const colors[] = {
	"2", "4", "16", "256", "65536", "??", "??", "??"
};



static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq,
								void *offset)
{
	int checksum = nvram_check_checksum();
	int i;
	unsigned vmode;

	seq_printf(seq, "Checksum status  : %svalid\n", checksum ? "" : "not ");

	seq_printf(seq, "Boot preference  : ");
	for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) {
		if (nvram[1] == boot_prefs[i].val) {
			seq_printf(seq, "%s\n", boot_prefs[i].name);
			break;
		}
	}
	if (i < 0)
		seq_printf(seq, "0x%02x (undefined)\n", nvram[1]);

	seq_printf(seq, "SCSI arbitration : %s\n",
	    (nvram[16] & 0x80) ? "on" : "off");
	seq_printf(seq, "SCSI host ID     : ");
	if (nvram[16] & 0x80)
		seq_printf(seq, "%d\n", nvram[16] & 7);
	else
		seq_printf(seq, "n/a\n");

	/* the following entries are defined only for the Falcon */
	if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)
		return;

	seq_printf(seq, "OS language      : ");
	if (nvram[6] < ARRAY_SIZE(languages))
		seq_printf(seq, "%s\n", languages[nvram[6]]);
	else
		seq_printf(seq, "%u (undefined)\n", nvram[6]);
	seq_printf(seq, "Keyboard language: ");
	if (nvram[7] < ARRAY_SIZE(languages))
		seq_printf(seq, "%s\n", languages[nvram[7]]);
	else
		seq_printf(seq, "%u (undefined)\n", nvram[7]);
	seq_printf(seq, "Date format      : ");
	seq_printf(seq, dateformat[nvram[8] & 7],
	    nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
	seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12);
	seq_printf(seq, "Boot delay       : ");
	if (nvram[10] == 0)
		seq_printf(seq, "default");
	else
		seq_printf(seq, "%ds%s\n", nvram[10],
		    nvram[10] < 8 ? ", no memory test" : "");

	vmode = (nvram[14] << 8) | nvram[15];
	seq_printf(seq,
	    "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");
	seq_printf(seq, "                   %soverscan, compat. mode %s%s\n",
	    vmode & 64 ? "" : "no ",
	    vmode & 128 ? "on" : "off",
	    vmode & 256 ?
	    (vmode & 16 ? ", line doubling" : ", half screen") : "");

	return;
}
Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 413 84.29% 1 25.00%
Wim Van Sebroeck 73 14.90% 1 25.00%
Tobias Klauser 3 0.61% 1 25.00%
Finn Thain 1 0.20% 1 25.00%
Total 490 100.00% 4 100.00%

#endif

#endif /* MACH == ATARI */

MODULE_LICENSE("GPL");

MODULE_ALIAS_MISCDEV(NVRAM_MINOR);
Overall Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 2094 71.84% 15 34.88%
Tim Hockin 357 12.25% 1 2.33%
Wim Van Sebroeck 288 9.88% 2 4.65%
Linus Torvalds 37 1.27% 4 9.30%
Arnd Bergmann 33 1.13% 2 4.65%
H. Peter Anvin 28 0.96% 1 2.33%
Al Viro 19 0.65% 4 9.30%
Art Haas 14 0.48% 1 2.33%
Corentin Labbe 11 0.38% 1 2.33%
Adrian Bunk 8 0.27% 1 2.33%
Andrew Morton 5 0.17% 1 2.33%
Tobias Klauser 5 0.17% 1 2.33%
Geert Uytterhoeven 5 0.17% 2 4.65%
Thomas Gleixner 4 0.14% 1 2.33%
Dave Jones 2 0.07% 1 2.33%
Rusty Russell 1 0.03% 1 2.33%
Finn Thain 1 0.03% 1 2.33%
Josef Bacik 1 0.03% 1 2.33%
Michael Witten 1 0.03% 1 2.33%
Arjan van de Ven 1 0.03% 1 2.33%
Total 2915 100.00% 43 100.00%
Directory: drivers/char

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Linus Torvalds (pre-git)	15	88.24%	1	50.00%
Tim Hockin	2	11.76%	1	50.00%
Total	17	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 drivers/char/nvram.c

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