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-rw-r--r--drivers/firmware/Makefile3
-rw-r--r--drivers/firmware/dmi_scan.c358
2 files changed, 360 insertions, 1 deletions
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 85429979d0db..98e395f4bb29 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -1,7 +1,8 @@
#
# Makefile for the linux kernel.
#
-obj-$(CONFIG_EDD) += edd.o
+obj-$(CONFIG_DMI) += dmi_scan.o
+obj-$(CONFIG_EDD) += edd.o
obj-$(CONFIG_EFI_VARS) += efivars.o
obj-$(CONFIG_EFI_PCDP) += pcdp.o
obj-$(CONFIG_DELL_RBU) += dell_rbu.o
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
new file mode 100644
index 000000000000..948bd7e1445a
--- /dev/null
+++ b/drivers/firmware/dmi_scan.c
@@ -0,0 +1,358 @@
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/dmi.h>
+#include <linux/efi.h>
+#include <linux/bootmem.h>
+#include <linux/slab.h>
+#include <asm/dmi.h>
+
+static char * __init dmi_string(struct dmi_header *dm, u8 s)
+{
+ u8 *bp = ((u8 *) dm) + dm->length;
+ char *str = "";
+
+ if (s) {
+ s--;
+ while (s > 0 && *bp) {
+ bp += strlen(bp) + 1;
+ s--;
+ }
+
+ if (*bp != 0) {
+ str = dmi_alloc(strlen(bp) + 1);
+ if (str != NULL)
+ strcpy(str, bp);
+ else
+ printk(KERN_ERR "dmi_string: out of memory.\n");
+ }
+ }
+
+ return str;
+}
+
+/*
+ * We have to be cautious here. We have seen BIOSes with DMI pointers
+ * pointing to completely the wrong place for example
+ */
+static int __init dmi_table(u32 base, int len, int num,
+ void (*decode)(struct dmi_header *))
+{
+ u8 *buf, *data;
+ int i = 0;
+
+ buf = dmi_ioremap(base, len);
+ if (buf == NULL)
+ return -1;
+
+ data = buf;
+
+ /*
+ * 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) {
+ struct dmi_header *dm = (struct dmi_header *)data;
+ /*
+ * We want to know the total length (formated 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);
+ data += 2;
+ i++;
+ }
+ dmi_iounmap(buf, len);
+ return 0;
+}
+
+static int __init dmi_checksum(u8 *buf)
+{
+ u8 sum = 0;
+ int a;
+
+ for (a = 0; a < 15; a++)
+ sum += buf[a];
+
+ return sum == 0;
+}
+
+static char *dmi_ident[DMI_STRING_MAX];
+static LIST_HEAD(dmi_devices);
+
+/*
+ * Save a DMI string
+ */
+static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
+{
+ char *p, *d = (char*) dm;
+
+ if (dmi_ident[slot])
+ return;
+
+ p = dmi_string(dm, d[string]);
+ if (p == NULL)
+ return;
+
+ dmi_ident[slot] = p;
+}
+
+static void __init dmi_save_devices(struct dmi_header *dm)
+{
+ int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
+ struct dmi_device *dev;
+
+ for (i = 0; i < count; i++) {
+ char *d = (char *)(dm + 1) + (i * 2);
+
+ /* Skip disabled device */
+ if ((*d & 0x80) == 0)
+ continue;
+
+ dev = dmi_alloc(sizeof(*dev));
+ if (!dev) {
+ printk(KERN_ERR "dmi_save_devices: out of memory.\n");
+ break;
+ }
+
+ dev->type = *d++ & 0x7f;
+ dev->name = dmi_string(dm, *d);
+ dev->device_data = NULL;
+
+ list_add(&dev->list, &dmi_devices);
+ }
+}
+
+static void __init dmi_save_ipmi_device(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(&dev->list, &dmi_devices);
+}
+
+/*
+ * 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(struct dmi_header *dm)
+{
+ 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);
+ 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);
+ break;
+ case 10: /* Onboard Devices Information */
+ dmi_save_devices(dm);
+ break;
+ case 38: /* IPMI Device Information */
+ dmi_save_ipmi_device(dm);
+ }
+}
+
+static int __init dmi_present(char __iomem *p)
+{
+ u8 buf[15];
+ memcpy_fromio(buf, p, 15);
+ if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
+ u16 num = (buf[13] << 8) | buf[12];
+ u16 len = (buf[7] << 8) | buf[6];
+ u32 base = (buf[11] << 24) | (buf[10] << 16) |
+ (buf[9] << 8) | buf[8];
+
+ /*
+ * DMI version 0.0 means that the real version is taken from
+ * the SMBIOS version, which we don't know at this point.
+ */
+ if (buf[14] != 0)
+ printk(KERN_INFO "DMI %d.%d present.\n",
+ buf[14] >> 4, buf[14] & 0xF);
+ else
+ printk(KERN_INFO "DMI present.\n");
+ if (dmi_table(base,len, num, dmi_decode) == 0)
+ return 0;
+ }
+ return 1;
+}
+
+void __init dmi_scan_machine(void)
+{
+ char __iomem *p, *q;
+ int rc;
+
+ if (efi_enabled) {
+ if (efi.smbios == EFI_INVALID_TABLE_ADDR)
+ goto out;
+
+ /* 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 out;
+
+ rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
+ dmi_iounmap(p, 32);
+ if (!rc)
+ return;
+ }
+ 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 out;
+
+ for (q = p; q < p + 0x10000; q += 16) {
+ rc = dmi_present(q);
+ if (!rc)
+ return;
+ }
+ }
+ out: printk(KERN_INFO "DMI not present or invalid.\n");
+}
+
+/**
+ * dmi_check_system - check system DMI data
+ * @list: array of dmi_system_id structures to match against
+ *
+ * Walk the blacklist table running matching functions until someone
+ * returns non zero or we hit the end. Callback function is called for
+ * each successfull match. Returns the number of matches.
+ */
+int dmi_check_system(struct dmi_system_id *list)
+{
+ int i, count = 0;
+ struct dmi_system_id *d = list;
+
+ while (d->ident) {
+ for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
+ int s = d->matches[i].slot;
+ if (s == DMI_NONE)
+ continue;
+ if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
+ continue;
+ /* No match */
+ goto fail;
+ }
+ count++;
+ if (d->callback && d->callback(d))
+ break;
+fail: d++;
+ }
+
+ return count;
+}
+EXPORT_SYMBOL(dmi_check_system);
+
+/**
+ * dmi_get_system_info - return DMI data value
+ * @field: data index (see enum dmi_filed)
+ *
+ * Returns one DMI data value, can be used to perform
+ * complex DMI data checks.
+ */
+char *dmi_get_system_info(int field)
+{
+ return dmi_ident[field];
+}
+EXPORT_SYMBOL(dmi_get_system_info);
+
+/**
+ * dmi_find_device - find onboard device by type/name
+ * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
+ * @desc: 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 to the @from argument.
+ * If @from is not %NULL, searches continue from next device.
+ */
+struct dmi_device * dmi_find_device(int type, const char *name,
+ struct dmi_device *from)
+{
+ struct list_head *d, *head = from ? &from->list : &dmi_devices;
+
+ for(d = head->next; d != &dmi_devices; d = d->next) {
+ 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_year - Return year of a DMI date
+ * @field: data index (like dmi_get_system_info)
+ *
+ * Returns -1 when the field doesn't exist. 0 when it is broken.
+ */
+int dmi_get_year(int field)
+{
+ int year;
+ char *s = dmi_get_system_info(field);
+
+ if (!s)
+ return -1;
+ if (*s == '\0')
+ return 0;
+ s = strrchr(s, '/');
+ if (!s)
+ return 0;
+
+ s += 1;
+ year = simple_strtoul(s, NULL, 0);
+ if (year && year < 100) { /* 2-digit year */
+ year += 1900;
+ if (year < 1996) /* no dates < spec 1.0 */
+ year += 100;
+ }
+
+ return year;
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-28 07:43:41 +0300