nvram.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 927 行 · 第 1/2 页

	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);