Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 926 insertions, 0 deletions

diff --git a/drivers/char/nvram.c b/drivers/char/nvram.c
new file mode 100644
index 00000000000..f63a3fd7ca6
--- /dev/null
+++ b/drivers/char/nvram.c
@@ -0,0 +1,926 @@
+/*
+ * 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/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))
+
+#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;
+}
+
+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 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 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 < sizeof (floppy_types) / sizeof (*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 < sizeof (floppy_types) / sizeof (*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 == COBALT
+
+/* the cobalt CMOS has a wider range of its 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: %svalid\n", checksum ? "" : "not ");
+
+	flags = nvram[COBT_CMOS_FLAG_BYTE_0] << 8 
+	    | nvram[COBT_CMOS_FLAG_BYTE_1];
+
+	PRINT_PROC("Console: %s\n",
+		flags & COBT_CMOS_CONSOLE_FLAG ?  "on": "off");
+
+	PRINT_PROC("Firmware Debug Messages: %s\n",
+		flags & COBT_CMOS_DEBUG_FLAG ? "on": "off");
+
+	PRINT_PROC("Auto Prompt: %s\n",
+		flags & COBT_CMOS_AUTO_PROMPT_FLAG ? "on": "off");
+
+	PRINT_PROC("Shutdown Status: %s\n",
+		flags & COBT_CMOS_CLEAN_BOOT_FLAG ? "clean": "dirty");
+
+	PRINT_PROC("Hardware Probe: %s\n",
+		flags & COBT_CMOS_HW_NOPROBE_FLAG ? "partial": "full");
+
+	PRINT_PROC("System Fault: %sdetected\n",
+		flags & COBT_CMOS_SYSFAULT_FLAG ? "": "not ");
+
+	PRINT_PROC("Panic on OOPS: %s\n",
+		flags & COBT_CMOS_OOPSPANIC_FLAG ? "yes": "no");
+
+	PRINT_PROC("Delayed Cache Initialization: %s\n",
+		flags & COBT_CMOS_DELAY_CACHE_FLAG ? "yes": "no");
+
+	PRINT_PROC("Show Logo at Boot: %s\n",
+		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("disk\n");
+		break;
+
+	case COBT_CMOS_BOOT_METHOD_ROM:
+		PRINT_PROC("rom\n");
+		break;
+
+	case COBT_CMOS_BOOT_METHOD_NET:
+		PRINT_PROC("net\n");
+		break;
+
+	default:
+		PRINT_PROC("unknown\n");
+		break;
+	}
+
+	PRINT_PROC("Primary Boot Device: %d:%d\n",
+		nvram[COBT_CMOS_BOOT_DEV0_MAJ],
+		nvram[COBT_CMOS_BOOT_DEV0_MIN] );
+	PRINT_PROC("Secondary Boot Device: %d:%d\n",
+		nvram[COBT_CMOS_BOOT_DEV1_MAJ],
+		nvram[COBT_CMOS_BOOT_DEV1_MIN] );
+	PRINT_PROC("Tertiary Boot Device: %d:%d\n",
+		nvram[COBT_CMOS_BOOT_DEV2_MAJ],
+		nvram[COBT_CMOS_BOOT_DEV2_MIN] );
+
+	PRINT_PROC("Uptime: %d\n",
+		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: %d\n",
+		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] = '\0';
+
+	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.%d\n", 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%x\n",
+			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  : %svalid\n", checksum ? "" : "not ");
+
+	PRINT_PROC("Boot preference  : ");
+	for (i = fieldsize(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] < fieldsize(languages))
+		PRINT_PROC("%s\n", languages[nvram[6]]);
+	else
+		PRINT_PROC("%u (undefined)\n", nvram[6]);
+	PRINT_PROC("Keyboard language: ");
+	if (nvram[7] < fieldsize(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);
+EXPORT_SYMBOL(__nvram_set_checksum);
+EXPORT_SYMBOL(nvram_set_checksum);
+MODULE_ALIAS_MISCDEV(NVRAM_MINOR);