zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/firmware/dmi_scan.c b/ap/os/linux/linux-3.4.x/drivers/firmware/dmi_scan.c
new file mode 100644
index 0000000..4cd392d
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/firmware/dmi_scan.c
@@ -0,0 +1,795 @@
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/dmi.h>
+#include <linux/efi.h>
+#include <linux/bootmem.h>
+#include <linux/random.h>
+#include <asm/dmi.h>
+
+/*
+ * DMI stands for "Desktop Management Interface". It is part
+ * of and an antecedent to, SMBIOS, which stands for System
+ * Management BIOS. See further: http://www.dmtf.org/standards
+ */
+static char dmi_empty_string[] = " ";
+
+static u16 __initdata dmi_ver;
+/*
+ * Catch too early calls to dmi_check_system():
+ */
+static int dmi_initialized;
+
+static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
+{
+ const u8 *bp = ((u8 *) dm) + dm->length;
+
+ if (s) {
+ s--;
+ while (s > 0 && *bp) {
+ bp += strlen(bp) + 1;
+ s--;
+ }
+
+ if (*bp != 0) {
+ size_t len = strlen(bp)+1;
+ size_t cmp_len = len > 8 ? 8 : len;
+
+ if (!memcmp(bp, dmi_empty_string, cmp_len))
+ return dmi_empty_string;
+ return bp;
+ }
+ }
+
+ return "";
+}
+
+static char * __init dmi_string(const struct dmi_header *dm, u8 s)
+{
+ const char *bp = dmi_string_nosave(dm, s);
+ char *str;
+ size_t len;
+
+ if (bp == dmi_empty_string)
+ return dmi_empty_string;
+
+ len = strlen(bp) + 1;
+ str = dmi_alloc(len);
+ if (str != NULL)
+ strcpy(str, bp);
+ else
+ printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len);
+
+ return str;
+}
+
+/*
+ * We have to be cautious here. We have seen BIOSes with DMI pointers
+ * pointing to completely the wrong place for example
+ */
+static void dmi_table(u8 *buf, int len, int num,
+ void (*decode)(const struct dmi_header *, void *),
+ void *private_data)
+{
+ u8 *data = buf;
+ int i = 0;
+
+ /*
+ * Stop when we see all the items the table claimed to have
+ * OR we run off the end of the table (also happens)
+ */
+ while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
+ const struct dmi_header *dm = (const struct dmi_header *)data;
+
+ /*
+ * We want to know the total length (formatted area and
+ * strings) before decoding to make sure we won't run off the
+ * table in dmi_decode or dmi_string
+ */
+ data += dm->length;
+ while ((data - buf < len - 1) && (data[0] || data[1]))
+ data++;
+ if (data - buf < len - 1)
+ decode(dm, private_data);
+ data += 2;
+ i++;
+ }
+}
+
+static u32 dmi_base;
+static u16 dmi_len;
+static u16 dmi_num;
+
+static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
+ void *))
+{
+ u8 *buf;
+
+ buf = dmi_ioremap(dmi_base, dmi_len);
+ if (buf == NULL)
+ return -1;
+
+ dmi_table(buf, dmi_len, dmi_num, decode, NULL);
+
+ add_device_randomness(buf, dmi_len);
+
+ dmi_iounmap(buf, dmi_len);
+ return 0;
+}
+
+static int __init dmi_checksum(const u8 *buf, u8 len)
+{
+ u8 sum = 0;
+ int a;
+
+ for (a = 0; a < len; a++)
+ sum += buf[a];
+
+ return sum == 0;
+}
+
+static char *dmi_ident[DMI_STRING_MAX];
+static LIST_HEAD(dmi_devices);
+int dmi_available;
+
+/*
+ * Save a DMI string
+ */
+static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)
+{
+ const char *d = (const char*) dm;
+ char *p;
+
+ if (dmi_ident[slot])
+ return;
+
+ p = dmi_string(dm, d[string]);
+ if (p == NULL)
+ return;
+
+ dmi_ident[slot] = p;
+}
+
+static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)
+{
+ const u8 *d = (u8*) dm + index;
+ char *s;
+ int is_ff = 1, is_00 = 1, i;
+
+ if (dmi_ident[slot])
+ return;
+
+ for (i = 0; i < 16 && (is_ff || is_00); i++) {
+ if (d[i] != 0x00)
+ is_00 = 0;
+ if (d[i] != 0xFF)
+ is_ff = 0;
+ }
+
+ if (is_ff || is_00)
+ return;
+
+ s = dmi_alloc(16*2+4+1);
+ if (!s)
+ return;
+
+ /*
+ * As of version 2.6 of the SMBIOS specification, the first 3 fields of
+ * the UUID are supposed to be little-endian encoded. The specification
+ * says that this is the defacto standard.
+ */
+ if (dmi_ver >= 0x0206)
+ sprintf(s, "%pUL", d);
+ else
+ sprintf(s, "%pUB", d);
+
+ dmi_ident[slot] = s;
+}
+
+static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
+{
+ const u8 *d = (u8*) dm + index;
+ char *s;
+
+ if (dmi_ident[slot])
+ return;
+
+ s = dmi_alloc(4);
+ if (!s)
+ return;
+
+ sprintf(s, "%u", *d & 0x7F);
+ dmi_ident[slot] = s;
+}
+
+static void __init dmi_save_one_device(int type, const char *name)
+{
+ struct dmi_device *dev;
+
+ /* No duplicate device */
+ if (dmi_find_device(type, name, NULL))
+ return;
+
+ dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
+ if (!dev) {
+ printk(KERN_ERR "dmi_save_one_device: out of memory.\n");
+ return;
+ }
+
+ dev->type = type;
+ strcpy((char *)(dev + 1), name);
+ dev->name = (char *)(dev + 1);
+ dev->device_data = NULL;
+ list_add(&dev->list, &dmi_devices);
+}
+
+static void __init dmi_save_devices(const struct dmi_header *dm)
+{
+ int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
+
+ for (i = 0; i < count; i++) {
+ const char *d = (char *)(dm + 1) + (i * 2);
+
+ /* Skip disabled device */
+ if ((*d & 0x80) == 0)
+ continue;
+
+ dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
+ }
+}
+
+static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
+{
+ int i, count = *(u8 *)(dm + 1);
+ struct dmi_device *dev;
+
+ for (i = 1; i <= count; i++) {
+ char *devname = dmi_string(dm, i);
+
+ if (devname == dmi_empty_string)
+ continue;
+
+ dev = dmi_alloc(sizeof(*dev));
+ if (!dev) {
+ printk(KERN_ERR
+ "dmi_save_oem_strings_devices: out of memory.\n");
+ break;
+ }
+
+ dev->type = DMI_DEV_TYPE_OEM_STRING;
+ dev->name = devname;
+ dev->device_data = NULL;
+
+ list_add(&dev->list, &dmi_devices);
+ }
+}
+
+static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
+{
+ struct dmi_device *dev;
+ void * data;
+
+ data = dmi_alloc(dm->length);
+ if (data == NULL) {
+ printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
+ return;
+ }
+
+ memcpy(data, dm, dm->length);
+
+ dev = dmi_alloc(sizeof(*dev));
+ if (!dev) {
+ printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
+ return;
+ }
+
+ dev->type = DMI_DEV_TYPE_IPMI;
+ dev->name = "IPMI controller";
+ dev->device_data = data;
+
+ list_add_tail(&dev->list, &dmi_devices);
+}
+
+static void __init dmi_save_dev_onboard(int instance, int segment, int bus,
+ int devfn, const char *name)
+{
+ struct dmi_dev_onboard *onboard_dev;
+
+ onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1);
+ if (!onboard_dev) {
+ printk(KERN_ERR "dmi_save_dev_onboard: out of memory.\n");
+ return;
+ }
+ onboard_dev->instance = instance;
+ onboard_dev->segment = segment;
+ onboard_dev->bus = bus;
+ onboard_dev->devfn = devfn;
+
+ strcpy((char *)&onboard_dev[1], name);
+ onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD;
+ onboard_dev->dev.name = (char *)&onboard_dev[1];
+ onboard_dev->dev.device_data = onboard_dev;
+
+ list_add(&onboard_dev->dev.list, &dmi_devices);
+}
+
+static void __init dmi_save_extended_devices(const struct dmi_header *dm)
+{
+ const u8 *d = (u8*) dm + 5;
+
+ /* Skip disabled device */
+ if ((*d & 0x80) == 0)
+ return;
+
+ dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5),
+ dmi_string_nosave(dm, *(d-1)));
+ dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
+}
+
+/*
+ * Process a DMI table entry. Right now all we care about are the BIOS
+ * and machine entries. For 2.5 we should pull the smbus controller info
+ * out of here.
+ */
+static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
+{
+ switch(dm->type) {
+ case 0: /* BIOS Information */
+ dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
+ dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
+ dmi_save_ident(dm, DMI_BIOS_DATE, 8);
+ break;
+ case 1: /* System Information */
+ dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
+ dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
+ dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
+ dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
+ dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
+ break;
+ case 2: /* Base Board Information */
+ dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
+ dmi_save_ident(dm, DMI_BOARD_NAME, 5);
+ dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
+ dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
+ dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
+ break;
+ case 3: /* Chassis Information */
+ dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
+ dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
+ dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
+ dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
+ dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
+ break;
+ case 10: /* Onboard Devices Information */
+ dmi_save_devices(dm);
+ break;
+ case 11: /* OEM Strings */
+ dmi_save_oem_strings_devices(dm);
+ break;
+ case 38: /* IPMI Device Information */
+ dmi_save_ipmi_device(dm);
+ break;
+ case 41: /* Onboard Devices Extended Information */
+ dmi_save_extended_devices(dm);
+ }
+}
+
+static void __init print_filtered(const char *info)
+{
+ const char *p;
+
+ if (!info)
+ return;
+
+ for (p = info; *p; p++)
+ if (isprint(*p))
+ printk(KERN_CONT "%c", *p);
+ else
+ printk(KERN_CONT "\\x%02x", *p & 0xff);
+}
+
+static void __init dmi_dump_ids(void)
+{
+ const char *board; /* Board Name is optional */
+
+ printk(KERN_DEBUG "DMI: ");
+ print_filtered(dmi_get_system_info(DMI_SYS_VENDOR));
+ printk(KERN_CONT " ");
+ print_filtered(dmi_get_system_info(DMI_PRODUCT_NAME));
+ board = dmi_get_system_info(DMI_BOARD_NAME);
+ if (board) {
+ printk(KERN_CONT "/");
+ print_filtered(board);
+ }
+ printk(KERN_CONT ", BIOS ");
+ print_filtered(dmi_get_system_info(DMI_BIOS_VERSION));
+ printk(KERN_CONT " ");
+ print_filtered(dmi_get_system_info(DMI_BIOS_DATE));
+ printk(KERN_CONT "\n");
+}
+
+static int __init dmi_present(const char __iomem *p)
+{
+ u8 buf[15];
+
+ memcpy_fromio(buf, p, 15);
+ if (dmi_checksum(buf, 15)) {
+ dmi_num = (buf[13] << 8) | buf[12];
+ dmi_len = (buf[7] << 8) | buf[6];
+ dmi_base = (buf[11] << 24) | (buf[10] << 16) |
+ (buf[9] << 8) | buf[8];
+
+ if (dmi_walk_early(dmi_decode) == 0) {
+ if (dmi_ver)
+ pr_info("SMBIOS %d.%d present.\n",
+ dmi_ver >> 8, dmi_ver & 0xFF);
+ else {
+ dmi_ver = (buf[14] & 0xF0) << 4 |
+ (buf[14] & 0x0F);
+ pr_info("Legacy DMI %d.%d present.\n",
+ dmi_ver >> 8, dmi_ver & 0xFF);
+ }
+ dmi_dump_ids();
+ return 0;
+ }
+ }
+ dmi_ver = 0;
+ return 1;
+}
+
+static int __init smbios_present(const char __iomem *p)
+{
+ u8 buf[32];
+
+ memcpy_fromio(buf, p, 32);
+ if ((buf[5] < 32) && dmi_checksum(buf, buf[5])) {
+ dmi_ver = (buf[6] << 8) + buf[7];
+
+ /* Some BIOS report weird SMBIOS version, fix that up */
+ switch (dmi_ver) {
+ case 0x021F:
+ case 0x0221:
+ pr_debug("SMBIOS version fixup(2.%d->2.%d)\n",
+ dmi_ver & 0xFF, 3);
+ dmi_ver = 0x0203;
+ break;
+ case 0x0233:
+ pr_debug("SMBIOS version fixup(2.%d->2.%d)\n", 51, 6);
+ dmi_ver = 0x0206;
+ break;
+ }
+ return memcmp(p + 16, "_DMI_", 5) || dmi_present(p + 16);
+ }
+ return 1;
+}
+
+void __init dmi_scan_machine(void)
+{
+ char __iomem *p, *q;
+ int rc;
+
+ if (efi_enabled(EFI_CONFIG_TABLES)) {
+ if (efi.smbios == EFI_INVALID_TABLE_ADDR)
+ goto error;
+
+ /* This is called as a core_initcall() because it isn't
+ * needed during early boot. This also means we can
+ * iounmap the space when we're done with it.
+ */
+ p = dmi_ioremap(efi.smbios, 32);
+ if (p == NULL)
+ goto error;
+
+ rc = smbios_present(p);
+ dmi_iounmap(p, 32);
+ if (!rc) {
+ dmi_available = 1;
+ goto out;
+ }
+ }
+ else {
+ /*
+ * no iounmap() for that ioremap(); it would be a no-op, but
+ * it's so early in setup that sucker gets confused into doing
+ * what it shouldn't if we actually call it.
+ */
+ p = dmi_ioremap(0xF0000, 0x10000);
+ if (p == NULL)
+ goto error;
+
+ for (q = p; q < p + 0x10000; q += 16) {
+ if (memcmp(q, "_SM_", 4) == 0 && q - p <= 0xFFE0)
+ rc = smbios_present(q);
+ else if (memcmp(q, "_DMI_", 5) == 0)
+ rc = dmi_present(q);
+ else
+ continue;
+ if (!rc) {
+ dmi_available = 1;
+ dmi_iounmap(p, 0x10000);
+ goto out;
+ }
+ }
+ dmi_iounmap(p, 0x10000);
+ }
+ error:
+ printk(KERN_INFO "DMI not present or invalid.\n");
+ out:
+ dmi_initialized = 1;
+}
+
+/**
+ * dmi_matches - check if dmi_system_id structure matches system DMI data
+ * @dmi: pointer to the dmi_system_id structure to check
+ */
+static bool dmi_matches(const struct dmi_system_id *dmi)
+{
+ int i;
+
+ WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
+
+ for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
+ int s = dmi->matches[i].slot;
+ if (s == DMI_NONE)
+ break;
+ if (dmi_ident[s]
+ && strstr(dmi_ident[s], dmi->matches[i].substr))
+ continue;
+ /* No match */
+ return false;
+ }
+ return true;
+}
+
+/**
+ * dmi_is_end_of_table - check for end-of-table marker
+ * @dmi: pointer to the dmi_system_id structure to check
+ */
+static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
+{
+ return dmi->matches[0].slot == DMI_NONE;
+}
+
+/**
+ * dmi_check_system - check system DMI data
+ * @list: array of dmi_system_id structures to match against
+ * All non-null elements of the list must match
+ * their slot's (field index's) data (i.e., each
+ * list string must be a substring of the specified
+ * DMI slot's string data) to be considered a
+ * successful match.
+ *
+ * Walk the blacklist table running matching functions until someone
+ * returns non zero or we hit the end. Callback function is called for
+ * each successful match. Returns the number of matches.
+ */
+int dmi_check_system(const struct dmi_system_id *list)
+{
+ int count = 0;
+ const struct dmi_system_id *d;
+
+ for (d = list; !dmi_is_end_of_table(d); d++)
+ if (dmi_matches(d)) {
+ count++;
+ if (d->callback && d->callback(d))
+ break;
+ }
+
+ return count;
+}
+EXPORT_SYMBOL(dmi_check_system);
+
+/**
+ * dmi_first_match - find dmi_system_id structure matching system DMI data
+ * @list: array of dmi_system_id structures to match against
+ * All non-null elements of the list must match
+ * their slot's (field index's) data (i.e., each
+ * list string must be a substring of the specified
+ * DMI slot's string data) to be considered a
+ * successful match.
+ *
+ * Walk the blacklist table until the first match is found. Return the
+ * pointer to the matching entry or NULL if there's no match.
+ */
+const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
+{
+ const struct dmi_system_id *d;
+
+ for (d = list; !dmi_is_end_of_table(d); d++)
+ if (dmi_matches(d))
+ return d;
+
+ return NULL;
+}
+EXPORT_SYMBOL(dmi_first_match);
+
+/**
+ * dmi_get_system_info - return DMI data value
+ * @field: data index (see enum dmi_field)
+ *
+ * Returns one DMI data value, can be used to perform
+ * complex DMI data checks.
+ */
+const char *dmi_get_system_info(int field)
+{
+ return dmi_ident[field];
+}
+EXPORT_SYMBOL(dmi_get_system_info);
+
+/**
+ * dmi_name_in_serial - Check if string is in the DMI product serial information
+ * @str: string to check for
+ */
+int dmi_name_in_serial(const char *str)
+{
+ int f = DMI_PRODUCT_SERIAL;
+ if (dmi_ident[f] && strstr(dmi_ident[f], str))
+ return 1;
+ return 0;
+}
+
+/**
+ * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
+ * @str: Case sensitive Name
+ */
+int dmi_name_in_vendors(const char *str)
+{
+ static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
+ int i;
+ for (i = 0; fields[i] != DMI_NONE; i++) {
+ int f = fields[i];
+ if (dmi_ident[f] && strstr(dmi_ident[f], str))
+ return 1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(dmi_name_in_vendors);
+
+/**
+ * dmi_find_device - find onboard device by type/name
+ * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
+ * @name: device name string or %NULL to match all
+ * @from: previous device found in search, or %NULL for new search.
+ *
+ * Iterates through the list of known onboard devices. If a device is
+ * found with a matching @vendor and @device, a pointer to its device
+ * structure is returned. Otherwise, %NULL is returned.
+ * A new search is initiated by passing %NULL as the @from argument.
+ * If @from is not %NULL, searches continue from next device.
+ */
+const struct dmi_device * dmi_find_device(int type, const char *name,
+ const struct dmi_device *from)
+{
+ const struct list_head *head = from ? &from->list : &dmi_devices;
+ struct list_head *d;
+
+ for(d = head->next; d != &dmi_devices; d = d->next) {
+ const struct dmi_device *dev =
+ list_entry(d, struct dmi_device, list);
+
+ if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
+ ((name == NULL) || (strcmp(dev->name, name) == 0)))
+ return dev;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(dmi_find_device);
+
+/**
+ * dmi_get_date - parse a DMI date
+ * @field: data index (see enum dmi_field)
+ * @yearp: optional out parameter for the year
+ * @monthp: optional out parameter for the month
+ * @dayp: optional out parameter for the day
+ *
+ * The date field is assumed to be in the form resembling
+ * [mm[/dd]]/yy[yy] and the result is stored in the out
+ * parameters any or all of which can be omitted.
+ *
+ * If the field doesn't exist, all out parameters are set to zero
+ * and false is returned. Otherwise, true is returned with any
+ * invalid part of date set to zero.
+ *
+ * On return, year, month and day are guaranteed to be in the
+ * range of [0,9999], [0,12] and [0,31] respectively.
+ */
+bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
+{
+ int year = 0, month = 0, day = 0;
+ bool exists;
+ const char *s, *y;
+ char *e;
+
+ s = dmi_get_system_info(field);
+ exists = s;
+ if (!exists)
+ goto out;
+
+ /*
+ * Determine year first. We assume the date string resembles
+ * mm/dd/yy[yy] but the original code extracted only the year
+ * from the end. Keep the behavior in the spirit of no
+ * surprises.
+ */
+ y = strrchr(s, '/');
+ if (!y)
+ goto out;
+
+ y++;
+ year = simple_strtoul(y, &e, 10);
+ if (y != e && year < 100) { /* 2-digit year */
+ year += 1900;
+ if (year < 1996) /* no dates < spec 1.0 */
+ year += 100;
+ }
+ if (year > 9999) /* year should fit in %04d */
+ year = 0;
+
+ /* parse the mm and dd */
+ month = simple_strtoul(s, &e, 10);
+ if (s == e || *e != '/' || !month || month > 12) {
+ month = 0;
+ goto out;
+ }
+
+ s = e + 1;
+ day = simple_strtoul(s, &e, 10);
+ if (s == y || s == e || *e != '/' || day > 31)
+ day = 0;
+out:
+ if (yearp)
+ *yearp = year;
+ if (monthp)
+ *monthp = month;
+ if (dayp)
+ *dayp = day;
+ return exists;
+}
+EXPORT_SYMBOL(dmi_get_date);
+
+/**
+ * dmi_walk - Walk the DMI table and get called back for every record
+ * @decode: Callback function
+ * @private_data: Private data to be passed to the callback function
+ *
+ * Returns -1 when the DMI table can't be reached, 0 on success.
+ */
+int dmi_walk(void (*decode)(const struct dmi_header *, void *),
+ void *private_data)
+{
+ u8 *buf;
+
+ if (!dmi_available)
+ return -1;
+
+ buf = ioremap(dmi_base, dmi_len);
+ if (buf == NULL)
+ return -1;
+
+ dmi_table(buf, dmi_len, dmi_num, decode, private_data);
+
+ iounmap(buf);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dmi_walk);
+
+/**
+ * dmi_match - compare a string to the dmi field (if exists)
+ * @f: DMI field identifier
+ * @str: string to compare the DMI field to
+ *
+ * Returns true if the requested field equals to the str (including NULL).
+ */
+bool dmi_match(enum dmi_field f, const char *str)
+{
+ const char *info = dmi_get_system_info(f);
+
+ if (info == NULL || str == NULL)
+ return info == str;
+
+ return !strcmp(info, str);
+}
+EXPORT_SYMBOL_GPL(dmi_match);