nvram.c

linux和2410结合开发 用他可以生成2410所需的zImage文件

#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_int( 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",0,0,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", 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;
	
	for( i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i )
		sum += nvram_read_int( i );
	return( (sum & 0xffff) ==
			((nvram_read_int(PC_CKS_LOC) << 8) |
			 nvram_read_int(PC_CKS_LOC+1)) );
}

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_int( i );
	nvram_write_int( sum >> 8, PC_CKS_LOC );
	nvram_write_int( 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_int();
	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 == 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_int( i );
	return( nvram_read_int( ATARI_CKS_LOC ) == (~sum & 0xff) &&
			nvram_read_int( 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_int( i );
	nvram_write_int( ~sum, ATARI_CKS_LOC );
	nvram_write_int( 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_NO_SYMBOLS;

/*
 * Local variables:
 *  c-indent-level: 4
 *  tab-width: 4
 * End:
 */