/* ----------------------------------------------------------------------- *
*
* Copyright 2011 Intel Corporation; author: H. Peter Anvin
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* Search DMI information for specific data or strings
*/
#include <string.h>
#include <stdio.h>
#include <sys/bitops.h>
#include <sys/cpu.h>
#include <syslinux/sysappend.h>
#include "core.h"
struct dmi_table {
uint8_t type;
uint8_t length;
uint16_t handle;
};
struct dmi_header {
char signature[5];
uint8_t csum;
uint16_t tbllen;
uint32_t tbladdr;
uint16_t nstruc;
uint8_t revision;
uint8_t reserved;
};
struct smbios_header {
char signature[4];
uint8_t csum;
uint8_t len;
uint8_t major;
uint8_t minor;
uint16_t maxsize;
uint8_t revision;
uint8_t fmt[5];
struct dmi_header dmi;
};
static const struct dmi_header *dmi;
static uint8_t checksum(const void *buf, size_t len)
{
const uint8_t *p = buf;
uint8_t csum = 0;
while (len--)
csum += *p++;
return csum;
}
static bool is_old_dmi(size_t dptr)
{
const struct dmi_header *dmi = (void *)dptr;
return !memcmp(dmi->signature, "_DMI_", 5) &&
!checksum(dmi, 0x0f);
return false;
}
static bool is_smbios(size_t dptr)
{
const struct smbios_header *smb = (void *)dptr;
return !memcmp(smb->signature, "_SM_", 4) &&
!checksum(smb, smb->len) &&
is_old_dmi(dptr+16);
}
/*
* Find the root structure
*/
static void dmi_find_header(void)
{
size_t dptr;
/* Search for _SM_ or _DMI_ structure */
for (dptr = 0xf0000 ; dptr < 0x100000 ; dptr += 16) {
if (is_smbios(dptr)) {
dmi = (const struct dmi_header *)(dptr + 16);
break;
} else if (is_old_dmi(dptr)) {
dmi = (const struct dmi_header *)dptr;
break;
}
}
}
/*
* Return a specific data element in a specific table, and verify
* that it is within the bounds of the table.
*/
static const void *dmi_find_data(uint8_t type, uint8_t base, uint8_t length)
{
const struct dmi_table *table;
size_t offset, end;
unsigned int tblcount;
if (!dmi)
return NULL;
if (base < 2)
return NULL;
end = base+length;
offset = 0;
tblcount = dmi->nstruc;
while (offset+6 <= dmi->tbllen && tblcount--) {
table = (const struct dmi_table *)(dmi->tbladdr + offset);
if (table->type == 127) /* End of table */
break;
if (table->length < sizeof *table)
break; /* Invalid length */
offset += table->length;
if (table->type == type && end <= table->length)
return (const char *)table + base;
/* Search for a double NUL terminating the string table */
while (offset+2 <= dmi->tbllen &&
*(const uint16_t *)(dmi->tbladdr + offset) != 0)
offset++;
offset += 2;
}
return NULL;
}
/*
* Return a specific string in a specific table.
*/
static const char *dmi_find_string(uint8_t type, uint8_t base)
{
const struct dmi_table *table;
size_t offset;
unsigned int tblcount;
if (!dmi)
return NULL;
if (base < 2)
return NULL;
offset = 0;
tblcount = dmi->nstruc;
while (offset+6 <= dmi->tbllen && tblcount--) {
table = (const struct dmi_table *)(dmi->tbladdr + offset);
if (table->type == 127) /* End of table */
break;
if (table->length < sizeof *table)
break; /* Invalid length */
offset += table->length;
if (table->type == type && base < table->length) {
uint8_t index = ((const uint8_t *)table)[base];
const char *p = (const char *)table + table->length;
const char *str;
char c;
if (!index)
return NULL; /* String not present */
while (--index) {
if (!*p)
return NULL;
do {
if (offset++ >= dmi->tbllen)
return NULL;
c = *p++;
} while (c);
}
/* Make sure the string is null-terminated */
str = p;
do {
if (offset++ >= dmi->tbllen)
return NULL;
c = *p++;
} while (c);
return str;
}
/* Search for a double NUL terminating the string table */
while (offset+2 <= dmi->tbllen &&
*(const uint16_t *)(dmi->tbladdr + offset) != 0)
offset++;
offset += 2;
}
return NULL;
}
struct sysappend_dmi_strings {
const char *prefix;
enum syslinux_sysappend sa;
uint8_t index;
uint8_t offset;
};
static const struct sysappend_dmi_strings dmi_strings[] = {
{ "SYSVENDOR=", SYSAPPEND_SYSVENDOR, 1, 0x04 },
{ "SYSPRODUCT=", SYSAPPEND_SYSPRODUCT, 1, 0x05 },
{ "SYSVERSION=", SYSAPPEND_SYSVERSION, 1, 0x06 },
{ "SYSSERIAL=", SYSAPPEND_SYSSERIAL, 1, 0x07 },
{ "SYSSKU=", SYSAPPEND_SYSSKU, 1, 0x19 },
{ "SYSFAMILY=", SYSAPPEND_SYSFAMILY, 1, 0x1a },
{ "MBVENDOR=", SYSAPPEND_MBVENDOR, 2, 0x04 },
{ "MBPRODUCT=", SYSAPPEND_MBPRODUCT, 2, 0x05 },
{ "MBVERSION=", SYSAPPEND_MBVERSION, 2, 0x06 },
{ "MBSERIAL=", SYSAPPEND_MBSERIAL, 2, 0x07 },
{ "MBASSET=", SYSAPPEND_MBASSET, 2, 0x08 },
{ "BIOSVENDOR=", SYSAPPEND_BIOSVENDOR, 0, 0x04 },
{ "BIOSVERSION=", SYSAPPEND_BIOSVERSION, 0, 0x05 },
{ NULL, 0, 0, 0 }
};
/*
* Install the string in the string table, if nonempty, after
* removing leading and trailing whitespace.
*/
static bool is_ctl_or_whitespace(char c)
{
return (c <= ' ' || c == '\x7f');
}
static const char *dmi_install_string(const char *pfx, const char *str)
{
const char *p, *ep;
size_t pfxlen;
char *nstr, *q;
if (!str)
return NULL;
while (*str && is_ctl_or_whitespace(*str))
str++;
if (!*str)
return NULL;
ep = p = str;
while (*p) {
if (!is_ctl_or_whitespace(*p))
ep = p+1;
p++;
}
pfxlen = strlen(pfx);
q = nstr = malloc(pfxlen + (ep-str) + 1);
if (!nstr)
return NULL;
memcpy(q, pfx, pfxlen);
q += pfxlen;
memcpy(q, str, ep-str);
q += (ep-str);
*q = '\0';
return nstr;
}
static void sysappend_set_sysff(const uint8_t *type)
{
static char sysff_str[] = "SYSFF=000";
if (!type || !*type)
return;
sprintf(sysff_str+6, "%u", *type & 0x7f);
sysappend_strings[SYSAPPEND_SYSFF] = sysff_str;
}
struct cpuflag {
uint8_t bit;
char flag;
};
static void sysappend_set_cpu(void)
{
static char cpu_str[6+6] = "CPU=";
char *p = cpu_str + 4;
static const struct cpuflag cpuflags[] = {
{ 0*32+ 6, 'P' }, /* PAE */
{ 1*32+ 5, 'V' }, /* VMX */
{ 1*32+ 6, 'T' }, /* SMX (TXT) */
{ 2*32+20, 'X' }, /* XD/NX */
{ 2*32+29, 'L' }, /* Long mode (x86-64) */
{ 3*32+ 2, 'S' }, /* SVM */
{ 0, 0 }
};
const struct cpuflag *cf;
/* Not technically from DMI, but it fit here... */
if (!cpu_has_eflag(EFLAGS_ID)) {
/* No CPUID */
*p++ = cpu_has_eflag(EFLAGS_AC) ? '4' : '3';
} else {
uint32_t flags[4], eax, ebx, family;
uint32_t ext_level;
cpuid(1, &eax, &ebx, &flags[1], &flags[0]);
family = (eax & 0x0ff00f00) >> 8;
*p++ = family >= 6 ? '6' : family + '0';
ext_level = cpuid_eax(0x80000000);
if (ext_level >= 0x80000001 && ext_level <= 0x8000ffff) {
cpuid(0x80000001, &eax, &ebx, &flags[3], &flags[2]);
} else {
flags[2] = flags[3] = 0;
}
for (cf = cpuflags; cf->flag; cf++) {
if (test_bit(cf->bit, flags))
*p++ = cf->flag;
}
}
*p = '\0';
sysappend_strings[SYSAPPEND_CPU] = cpu_str;
}
void dmi_init(void)
{
const struct sysappend_dmi_strings *ds;
sysappend_set_cpu();
dmi_find_header();
if (!dmi)
return;
sysappend_set_uuid(dmi_find_data(1, 0x08, 16));
sysappend_set_sysff(dmi_find_data(3, 0x05, 1));
for (ds = dmi_strings; ds->prefix; ds++) {
if (!sysappend_strings[ds->sa]) {
const char *str = dmi_find_string(ds->index, ds->offset);
sysappend_strings[ds->sa] = dmi_install_string(ds->prefix, str);
}
}
}