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![Jeff Garzik](/assets/img/avatar_default.png)
Three main sets of changes: 1) dmi_get_system_info() return value should have been marked const, since callers should not be changing that data. 2) const-ify DMI internals, since DMI firmware tables should, whenever possible, be marked const to ensure we never ever write to that data area. 3) const-ify DMI API, to enable marking tables const where possible in low-level drivers. And if we're really lucky, this might enable some additional optimizations on the part of the compiler. The bulk of the changes are #2 and #3, which are interrelated. #1 could have been a separate patch, but it was so small compared to the others, it was easier to roll it into this changeset. Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
472 lines
11 KiB
C
472 lines
11 KiB
C
#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/dmi.h>
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#include <linux/efi.h>
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#include <linux/bootmem.h>
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#include <linux/slab.h>
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#include <asm/dmi.h>
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static char * __init dmi_string(const struct dmi_header *dm, u8 s)
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{
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const u8 *bp = ((u8 *) dm) + dm->length;
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char *str = "";
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if (s) {
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s--;
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while (s > 0 && *bp) {
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bp += strlen(bp) + 1;
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s--;
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}
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if (*bp != 0) {
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str = dmi_alloc(strlen(bp) + 1);
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if (str != NULL)
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strcpy(str, bp);
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else
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printk(KERN_ERR "dmi_string: out of memory.\n");
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}
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}
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return str;
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}
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/*
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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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*/
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static int __init dmi_table(u32 base, int len, int num,
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void (*decode)(const struct dmi_header *))
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{
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u8 *buf, *data;
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int i = 0;
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buf = dmi_ioremap(base, len);
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if (buf == NULL)
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return -1;
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data = buf;
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/*
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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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*/
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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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/*
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* We want to know the total length (formated area and strings)
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* before decoding to make sure we won't run off the table in
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* dmi_decode or dmi_string
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*/
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data += dm->length;
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while ((data - buf < len - 1) && (data[0] || data[1]))
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data++;
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if (data - buf < len - 1)
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decode(dm);
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data += 2;
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i++;
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}
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dmi_iounmap(buf, len);
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return 0;
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}
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static int __init dmi_checksum(const u8 *buf)
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{
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u8 sum = 0;
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int a;
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for (a = 0; a < 15; a++)
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sum += buf[a];
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return sum == 0;
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}
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static char *dmi_ident[DMI_STRING_MAX];
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static LIST_HEAD(dmi_devices);
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int dmi_available;
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/*
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* Save a DMI string
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*/
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static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)
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{
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const char *d = (const char*) dm;
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char *p;
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if (dmi_ident[slot])
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return;
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p = dmi_string(dm, d[string]);
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if (p == NULL)
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return;
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dmi_ident[slot] = p;
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}
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static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)
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{
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const u8 *d = (u8*) dm + index;
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char *s;
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int is_ff = 1, is_00 = 1, i;
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if (dmi_ident[slot])
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return;
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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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}
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if (is_ff || is_00)
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return;
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s = dmi_alloc(16*2+4+1);
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if (!s)
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return;
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sprintf(s,
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"%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
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d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],
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d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
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dmi_ident[slot] = s;
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}
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static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
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{
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const u8 *d = (u8*) dm + index;
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char *s;
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if (dmi_ident[slot])
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return;
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s = dmi_alloc(4);
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if (!s)
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return;
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sprintf(s, "%u", *d & 0x7F);
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dmi_ident[slot] = s;
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}
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static void __init dmi_save_devices(const struct dmi_header *dm)
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{
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int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
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struct dmi_device *dev;
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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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continue;
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dev = dmi_alloc(sizeof(*dev));
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if (!dev) {
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printk(KERN_ERR "dmi_save_devices: out of memory.\n");
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break;
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}
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dev->type = *d++ & 0x7f;
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dev->name = dmi_string(dm, *d);
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dev->device_data = NULL;
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list_add(&dev->list, &dmi_devices);
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}
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}
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static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
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{
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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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dev = dmi_alloc(sizeof(*dev));
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if (!dev) {
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printk(KERN_ERR
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"dmi_save_oem_strings_devices: out of memory.\n");
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break;
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}
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dev->type = DMI_DEV_TYPE_OEM_STRING;
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dev->name = dmi_string(dm, i);
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dev->device_data = NULL;
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list_add(&dev->list, &dmi_devices);
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}
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}
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static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
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{
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struct dmi_device *dev;
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void * data;
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data = dmi_alloc(dm->length);
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if (data == NULL) {
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printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
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return;
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}
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memcpy(data, dm, dm->length);
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dev = dmi_alloc(sizeof(*dev));
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if (!dev) {
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printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
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return;
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}
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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(&dev->list, &dmi_devices);
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}
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/*
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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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* out of here.
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*/
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static void __init dmi_decode(const struct dmi_header *dm)
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{
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switch(dm->type) {
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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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break;
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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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break;
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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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break;
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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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break;
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case 10: /* Onboard Devices Information */
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dmi_save_devices(dm);
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break;
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case 11: /* OEM Strings */
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dmi_save_oem_strings_devices(dm);
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break;
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case 38: /* IPMI Device Information */
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dmi_save_ipmi_device(dm);
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}
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}
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static int __init dmi_present(const char __iomem *p)
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{
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u8 buf[15];
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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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u16 num = (buf[13] << 8) | buf[12];
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u16 len = (buf[7] << 8) | buf[6];
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u32 base = (buf[11] << 24) | (buf[10] << 16) |
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(buf[9] << 8) | buf[8];
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/*
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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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*/
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if (buf[14] != 0)
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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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else
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printk(KERN_INFO "DMI present.\n");
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if (dmi_table(base,len, num, dmi_decode) == 0)
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return 0;
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}
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return 1;
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}
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void __init dmi_scan_machine(void)
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{
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char __iomem *p, *q;
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int rc;
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if (efi_enabled) {
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if (efi.smbios == EFI_INVALID_TABLE_ADDR)
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goto out;
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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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*/
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p = dmi_ioremap(efi.smbios, 32);
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if (p == NULL)
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goto out;
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rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
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dmi_iounmap(p, 32);
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if (!rc) {
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dmi_available = 1;
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return;
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}
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}
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else {
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/*
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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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*/
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p = dmi_ioremap(0xF0000, 0x10000);
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if (p == NULL)
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goto out;
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for (q = p; q < p + 0x10000; q += 16) {
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rc = dmi_present(q);
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if (!rc) {
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dmi_available = 1;
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return;
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}
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}
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}
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out: printk(KERN_INFO "DMI not present or invalid.\n");
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}
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/**
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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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* successful match.
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*
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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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*/
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int dmi_check_system(const struct dmi_system_id *list)
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{
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int i, count = 0;
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const struct dmi_system_id *d = list;
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while (d->ident) {
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for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
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int s = d->matches[i].slot;
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if (s == DMI_NONE)
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continue;
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if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
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continue;
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/* No match */
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goto fail;
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}
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count++;
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if (d->callback && d->callback(d))
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break;
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fail: d++;
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}
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return count;
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}
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EXPORT_SYMBOL(dmi_check_system);
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/**
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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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*
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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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*/
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const char *dmi_get_system_info(int field)
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{
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return dmi_ident[field];
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}
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EXPORT_SYMBOL(dmi_get_system_info);
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/**
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* dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.
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* @str: Case sensitive Name
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*/
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int dmi_name_in_vendors(const char *str)
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{
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static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR,
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DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR,
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DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE };
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int i;
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for (i = 0; fields[i] != DMI_NONE; i++) {
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int f = fields[i];
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if (dmi_ident[f] && strstr(dmi_ident[f], str))
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL(dmi_name_in_vendors);
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/**
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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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*
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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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*/
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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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{
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const struct list_head *head = from ? &from->list : &dmi_devices;
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struct list_head *d;
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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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return dev;
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}
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return NULL;
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}
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EXPORT_SYMBOL(dmi_find_device);
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/**
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* dmi_get_year - Return year of a DMI date
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* @field: data index (like dmi_get_system_info)
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*
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* Returns -1 when the field doesn't exist. 0 when it is broken.
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*/
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int dmi_get_year(int field)
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{
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int year;
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const char *s = dmi_get_system_info(field);
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if (!s)
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return -1;
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if (*s == '\0')
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return 0;
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s = strrchr(s, '/');
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if (!s)
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return 0;
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s += 1;
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year = simple_strtoul(s, NULL, 0);
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if (year && year < 100) { /* 2-digit year */
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year += 1900;
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if (year < 1996) /* no dates < spec 1.0 */
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year += 100;
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}
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return year;
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}
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