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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/bootmem.h>
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* DMI stands for "Desktop Management Interface". It is part
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* of and an antecedent to, SMBIOS, which stands for System
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* Management BIOS. See further: http://www.dmtf.org/standards
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static char dmi_empty_string[] = " ";
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* Catch too early calls to dmi_check_system():
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static int dmi_initialized;
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static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
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const u8 *bp = ((u8 *) dm) + dm->length;
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while (s > 0 && *bp) {
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size_t len = strlen(bp)+1;
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size_t cmp_len = len > 8 ? 8 : len;
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if (!memcmp(bp, dmi_empty_string, cmp_len))
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return dmi_empty_string;
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static char * __init dmi_string(const struct dmi_header *dm, u8 s)
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const char *bp = dmi_string_nosave(dm, s);
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if (bp == dmi_empty_string)
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return dmi_empty_string;
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printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len);
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* We have to be cautious here. We have seen BIOSes with DMI pointers
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* pointing to completely the wrong place for example
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static void dmi_table(u8 *buf, int len, int num,
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void (*decode)(const struct dmi_header *, void *),
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* Stop when we see all the items the table claimed to have
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* OR we run off the end of the table (also happens)
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while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
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const struct dmi_header *dm = (const struct dmi_header *)data;
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* We want to know the total length (formatted area and
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* strings) before decoding to make sure we won't run off the
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* table in dmi_decode or dmi_string
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while ((data - buf < len - 1) && (data[0] || data[1]))
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if (data - buf < len - 1)
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decode(dm, private_data);
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static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
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buf = dmi_ioremap(dmi_base, dmi_len);
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dmi_table(buf, dmi_len, dmi_num, decode, NULL);
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dmi_iounmap(buf, dmi_len);
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static int __init dmi_checksum(const u8 *buf)
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for (a = 0; a < 15; a++)
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static char *dmi_ident[DMI_STRING_MAX];
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static LIST_HEAD(dmi_devices);
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static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)
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const char *d = (const char*) dm;
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p = dmi_string(dm, d[string]);
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static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)
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const u8 *d = (u8*) dm + index;
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int is_ff = 1, is_00 = 1, i;
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for (i = 0; i < 16 && (is_ff || is_00); i++) {
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if(d[i] != 0x00) is_ff = 0;
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if(d[i] != 0xFF) is_00 = 0;
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s = dmi_alloc(16*2+4+1);
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sprintf(s, "%pUB", d);
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static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
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const u8 *d = (u8*) dm + index;
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sprintf(s, "%u", *d & 0x7F);
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static void __init dmi_save_one_device(int type, const char *name)
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struct dmi_device *dev;
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/* No duplicate device */
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if (dmi_find_device(type, name, NULL))
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dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
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printk(KERN_ERR "dmi_save_one_device: out of memory.\n");
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strcpy((char *)(dev + 1), name);
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dev->name = (char *)(dev + 1);
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dev->device_data = NULL;
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list_add(&dev->list, &dmi_devices);
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static void __init dmi_save_devices(const struct dmi_header *dm)
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int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
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for (i = 0; i < count; i++) {
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const char *d = (char *)(dm + 1) + (i * 2);
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/* Skip disabled device */
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if ((*d & 0x80) == 0)
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dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
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static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
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int i, count = *(u8 *)(dm + 1);
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struct dmi_device *dev;
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for (i = 1; i <= count; i++) {
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char *devname = dmi_string(dm, i);
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if (devname == dmi_empty_string)
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dev = dmi_alloc(sizeof(*dev));
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"dmi_save_oem_strings_devices: out of memory.\n");
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dev->type = DMI_DEV_TYPE_OEM_STRING;
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dev->device_data = NULL;
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list_add(&dev->list, &dmi_devices);
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static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
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struct dmi_device *dev;
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data = dmi_alloc(dm->length);
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printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
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memcpy(data, dm, dm->length);
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dev = dmi_alloc(sizeof(*dev));
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printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
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dev->type = DMI_DEV_TYPE_IPMI;
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dev->name = "IPMI controller";
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dev->device_data = data;
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list_add_tail(&dev->list, &dmi_devices);
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static void __init dmi_save_dev_onboard(int instance, int segment, int bus,
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int devfn, const char *name)
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struct dmi_dev_onboard *onboard_dev;
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onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1);
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printk(KERN_ERR "dmi_save_dev_onboard: out of memory.\n");
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onboard_dev->instance = instance;
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onboard_dev->segment = segment;
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onboard_dev->bus = bus;
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onboard_dev->devfn = devfn;
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strcpy((char *)&onboard_dev[1], name);
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onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD;
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onboard_dev->dev.name = (char *)&onboard_dev[1];
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onboard_dev->dev.device_data = onboard_dev;
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list_add(&onboard_dev->dev.list, &dmi_devices);
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static void __init dmi_save_extended_devices(const struct dmi_header *dm)
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const u8 *d = (u8*) dm + 5;
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/* Skip disabled device */
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if ((*d & 0x80) == 0)
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dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5),
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dmi_string_nosave(dm, *(d-1)));
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dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
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* Process a DMI table entry. Right now all we care about are the BIOS
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* and machine entries. For 2.5 we should pull the smbus controller info
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static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
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case 0: /* BIOS Information */
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dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
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dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
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dmi_save_ident(dm, DMI_BIOS_DATE, 8);
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case 1: /* System Information */
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dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
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dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
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dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
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dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
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dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
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case 2: /* Base Board Information */
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dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
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dmi_save_ident(dm, DMI_BOARD_NAME, 5);
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dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
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dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
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dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
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case 3: /* Chassis Information */
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dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
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dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
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dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
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dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
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dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
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case 10: /* Onboard Devices Information */
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dmi_save_devices(dm);
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case 11: /* OEM Strings */
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dmi_save_oem_strings_devices(dm);
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case 38: /* IPMI Device Information */
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dmi_save_ipmi_device(dm);
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case 41: /* Onboard Devices Extended Information */
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dmi_save_extended_devices(dm);
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static void __init print_filtered(const char *info)
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for (p = info; *p; p++)
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printk(KERN_CONT "%c", *p);
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printk(KERN_CONT "\\x%02x", *p & 0xff);
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static void __init dmi_dump_ids(void)
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const char *board; /* Board Name is optional */
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printk(KERN_DEBUG "DMI: ");
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print_filtered(dmi_get_system_info(DMI_SYS_VENDOR));
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printk(KERN_CONT " ");
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print_filtered(dmi_get_system_info(DMI_PRODUCT_NAME));
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board = dmi_get_system_info(DMI_BOARD_NAME);
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printk(KERN_CONT "/");
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print_filtered(board);
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printk(KERN_CONT ", BIOS ");
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print_filtered(dmi_get_system_info(DMI_BIOS_VERSION));
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printk(KERN_CONT " ");
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print_filtered(dmi_get_system_info(DMI_BIOS_DATE));
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printk(KERN_CONT "\n");
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static int __init dmi_present(const char __iomem *p)
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memcpy_fromio(buf, p, 15);
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if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
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dmi_num = (buf[13] << 8) | buf[12];
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dmi_len = (buf[7] << 8) | buf[6];
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dmi_base = (buf[11] << 24) | (buf[10] << 16) |
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(buf[9] << 8) | buf[8];
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* DMI version 0.0 means that the real version is taken from
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* the SMBIOS version, which we don't know at this point.
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printk(KERN_INFO "DMI %d.%d present.\n",
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buf[14] >> 4, buf[14] & 0xF);
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printk(KERN_INFO "DMI present.\n");
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if (dmi_walk_early(dmi_decode) == 0) {
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void __init dmi_scan_machine(void)
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if (efi.smbios == EFI_INVALID_TABLE_ADDR)
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/* This is called as a core_initcall() because it isn't
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* needed during early boot. This also means we can
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* iounmap the space when we're done with it.
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p = dmi_ioremap(efi.smbios, 32);
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rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
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* no iounmap() for that ioremap(); it would be a no-op, but
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* it's so early in setup that sucker gets confused into doing
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* what it shouldn't if we actually call it.
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p = dmi_ioremap(0xF0000, 0x10000);
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for (q = p; q < p + 0x10000; q += 16) {
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dmi_iounmap(p, 0x10000);
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dmi_iounmap(p, 0x10000);
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printk(KERN_INFO "DMI not present or invalid.\n");
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* dmi_matches - check if dmi_system_id structure matches system DMI data
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* @dmi: pointer to the dmi_system_id structure to check
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static bool dmi_matches(const struct dmi_system_id *dmi)
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WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
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for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
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int s = dmi->matches[i].slot;
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&& strstr(dmi_ident[s], dmi->matches[i].substr))
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* dmi_is_end_of_table - check for end-of-table marker
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* @dmi: pointer to the dmi_system_id structure to check
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static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
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return dmi->matches[0].slot == DMI_NONE;
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* dmi_check_system - check system DMI data
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* @list: array of dmi_system_id structures to match against
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* All non-null elements of the list must match
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* their slot's (field index's) data (i.e., each
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* list string must be a substring of the specified
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* DMI slot's string data) to be considered a
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* Walk the blacklist table running matching functions until someone
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* returns non zero or we hit the end. Callback function is called for
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* each successful match. Returns the number of matches.
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int dmi_check_system(const struct dmi_system_id *list)
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const struct dmi_system_id *d;
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for (d = list; !dmi_is_end_of_table(d); d++)
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if (dmi_matches(d)) {
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if (d->callback && d->callback(d))
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EXPORT_SYMBOL(dmi_check_system);
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* dmi_first_match - find dmi_system_id structure matching system DMI data
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* @list: array of dmi_system_id structures to match against
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* All non-null elements of the list must match
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* their slot's (field index's) data (i.e., each
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* list string must be a substring of the specified
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* DMI slot's string data) to be considered a
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* Walk the blacklist table until the first match is found. Return the
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* pointer to the matching entry or NULL if there's no match.
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const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
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const struct dmi_system_id *d;
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for (d = list; !dmi_is_end_of_table(d); d++)
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EXPORT_SYMBOL(dmi_first_match);
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* dmi_get_system_info - return DMI data value
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* @field: data index (see enum dmi_field)
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* Returns one DMI data value, can be used to perform
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* complex DMI data checks.
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const char *dmi_get_system_info(int field)
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return dmi_ident[field];
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EXPORT_SYMBOL(dmi_get_system_info);
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* dmi_name_in_serial - Check if string is in the DMI product serial information
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* @str: string to check for
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int dmi_name_in_serial(const char *str)
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int f = DMI_PRODUCT_SERIAL;
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if (dmi_ident[f] && strstr(dmi_ident[f], str))
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* dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
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* @str: Case sensitive Name
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int dmi_name_in_vendors(const char *str)
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static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
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for (i = 0; fields[i] != DMI_NONE; i++) {
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if (dmi_ident[f] && strstr(dmi_ident[f], str))
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EXPORT_SYMBOL(dmi_name_in_vendors);
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* dmi_find_device - find onboard device by type/name
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* @type: device type or %DMI_DEV_TYPE_ANY to match all device types
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* @name: device name string or %NULL to match all
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* @from: previous device found in search, or %NULL for new search.
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* Iterates through the list of known onboard devices. If a device is
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* found with a matching @vendor and @device, a pointer to its device
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* structure is returned. Otherwise, %NULL is returned.
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* A new search is initiated by passing %NULL as the @from argument.
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* If @from is not %NULL, searches continue from next device.
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const struct dmi_device * dmi_find_device(int type, const char *name,
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const struct dmi_device *from)
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const struct list_head *head = from ? &from->list : &dmi_devices;
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for(d = head->next; d != &dmi_devices; d = d->next) {
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const struct dmi_device *dev =
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list_entry(d, struct dmi_device, list);
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if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
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((name == NULL) || (strcmp(dev->name, name) == 0)))
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EXPORT_SYMBOL(dmi_find_device);
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* dmi_get_date - parse a DMI date
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* @field: data index (see enum dmi_field)
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* @yearp: optional out parameter for the year
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* @monthp: optional out parameter for the month
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* @dayp: optional out parameter for the day
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* The date field is assumed to be in the form resembling
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* [mm[/dd]]/yy[yy] and the result is stored in the out
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* parameters any or all of which can be omitted.
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* If the field doesn't exist, all out parameters are set to zero
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* and false is returned. Otherwise, true is returned with any
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* invalid part of date set to zero.
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* On return, year, month and day are guaranteed to be in the
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* range of [0,9999], [0,12] and [0,31] respectively.
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bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
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int year = 0, month = 0, day = 0;
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s = dmi_get_system_info(field);
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* Determine year first. We assume the date string resembles
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* mm/dd/yy[yy] but the original code extracted only the year
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* from the end. Keep the behavior in the spirit of no
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year = simple_strtoul(y, &e, 10);
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if (y != e && year < 100) { /* 2-digit year */
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if (year < 1996) /* no dates < spec 1.0 */
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if (year > 9999) /* year should fit in %04d */
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/* parse the mm and dd */
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month = simple_strtoul(s, &e, 10);
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if (s == e || *e != '/' || !month || month > 12) {
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day = simple_strtoul(s, &e, 10);
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if (s == y || s == e || *e != '/' || day > 31)
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EXPORT_SYMBOL(dmi_get_date);
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* dmi_walk - Walk the DMI table and get called back for every record
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* @decode: Callback function
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* @private_data: Private data to be passed to the callback function
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* Returns -1 when the DMI table can't be reached, 0 on success.
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int dmi_walk(void (*decode)(const struct dmi_header *, void *),
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buf = ioremap(dmi_base, dmi_len);
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dmi_table(buf, dmi_len, dmi_num, decode, private_data);
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EXPORT_SYMBOL_GPL(dmi_walk);
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* dmi_match - compare a string to the dmi field (if exists)
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* @f: DMI field identifier
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* @str: string to compare the DMI field to
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* Returns true if the requested field equals to the str (including NULL).
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bool dmi_match(enum dmi_field f, const char *str)
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const char *info = dmi_get_system_info(f);
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if (info == NULL || str == NULL)
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return !strcmp(info, str);
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EXPORT_SYMBOL_GPL(dmi_match);