freebsd-dev/sys/dev/ipmi/ipmi_smbios.c
John Baldwin c280c7d482 Fix test for double-nul characters that terminate the string table at
the end of each SMBIOS/DMI structure.

Submitted by:	Dmitrij Tejblum @ yandex.ru
MFC after:	3 days
2010-07-29 13:46:37 +00:00

299 lines
7.9 KiB
C

/*-
* Copyright (c) 2006 IronPort Systems Inc. <ambrisko@ironport.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/condvar.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/selinfo.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/pc/bios.h>
#ifdef LOCAL_MODULE
#include <ipmi.h>
#include <ipmivars.h>
#else
#include <sys/ipmi.h>
#include <dev/ipmi/ipmivars.h>
#endif
#if __FreeBSD_version < 602110
#define pmap_mapbios pmap_mapdev
#define pmap_unmapbios pmap_unmapdev
#endif
struct smbios_table {
uint8_t anchor_string[4];
uint8_t checksum;
uint8_t length;
uint8_t major_version;
uint8_t minor_version;
uint16_t maximum_structure_size;
uint8_t entry_point_revision;
uint8_t formatted_area[5];
uint8_t DMI_anchor_string[5];
uint8_t intermediate_checksum;
uint16_t structure_table_length;
uint32_t structure_table_address;
uint16_t number_structures;
uint8_t BCD_revision;
};
struct structure_header {
uint8_t type;
uint8_t length;
uint16_t handle;
};
struct ipmi_entry {
uint8_t type;
uint8_t length;
uint16_t handle;
uint8_t interface_type;
uint8_t spec_revision;
uint8_t i2c_slave_address;
uint8_t NV_storage_device_address;
uint64_t base_address;
uint8_t base_address_modifier;
uint8_t interrupt_number;
};
/* Fields in the base_address field of an IPMI entry. */
#define IPMI_BAR_MODE(ba) ((ba) & 0x0000000000000001)
#define IPMI_BAR_ADDR(ba) ((ba) & 0xfffffffffffffffe)
/* Fields in the base_address_modifier field of an IPMI entry. */
#define IPMI_BAM_IRQ_TRIGGER 0x01
#define IPMI_BAM_IRQ_POLARITY 0x02
#define IPMI_BAM_IRQ_VALID 0x08
#define IPMI_BAM_ADDR_LSB(bam) (((bam) & 0x10) >> 4)
#define IPMI_BAM_REG_SPACING(bam) (((bam) & 0xc0) >> 6)
#define SPACING_8 0x0
#define SPACING_32 0x1
#define SPACING_16 0x2
#define SMBIOS_START 0xf0000
#define SMBIOS_STEP 0x10
#define SMBIOS_OFF 0
#define SMBIOS_LEN 4
#define SMBIOS_SIG "_SM_"
typedef void (*smbios_callback_t)(struct structure_header *, void *);
static struct ipmi_get_info ipmi_info;
static int ipmi_probed;
static struct mtx ipmi_info_mtx;
MTX_SYSINIT(ipmi_info, &ipmi_info_mtx, "ipmi info", MTX_DEF);
static void ipmi_smbios_probe(struct ipmi_get_info *);
static int smbios_cksum(struct smbios_table *);
static void smbios_walk_table(uint8_t *, int, smbios_callback_t,
void *);
static void smbios_ipmi_info(struct structure_header *, void *);
static void
smbios_ipmi_info(struct structure_header *h, void *arg)
{
struct ipmi_get_info *info;
struct ipmi_entry *s;
if (h->type != 38 || h->length <
offsetof(struct ipmi_entry, interrupt_number))
return;
s = (struct ipmi_entry *)h;
info = arg;
bzero(info, sizeof(struct ipmi_get_info));
switch (s->interface_type) {
case KCS_MODE:
case SMIC_MODE:
info->address = IPMI_BAR_ADDR(s->base_address) |
IPMI_BAM_ADDR_LSB(s->base_address_modifier);
info->io_mode = IPMI_BAR_MODE(s->base_address);
switch (IPMI_BAM_REG_SPACING(s->base_address_modifier)) {
case SPACING_8:
info->offset = 1;
break;
case SPACING_32:
info->offset = 4;
break;
case SPACING_16:
info->offset = 2;
break;
default:
printf("SMBIOS: Invalid register spacing\n");
return;
}
break;
case SSIF_MODE:
if ((s->base_address & 0xffffffffffffff00) != 0) {
printf("SMBIOS: Invalid SSIF SMBus address, using BMC I2C slave address instead\n");
info->address = s->i2c_slave_address;
break;
}
info->address = IPMI_BAR_ADDR(s->base_address);
break;
default:
return;
}
if (s->length > offsetof(struct ipmi_entry, interrupt_number)) {
if (s->interrupt_number > 15)
printf("SMBIOS: Non-ISA IRQ %d for IPMI\n",
s->interrupt_number);
else
info->irq = s->interrupt_number;
}
info->iface_type = s->interface_type;
}
static void
smbios_walk_table(uint8_t *p, int entries, smbios_callback_t cb, void *arg)
{
struct structure_header *s;
while (entries--) {
s = (struct structure_header *)p;
cb(s, arg);
/*
* Look for a double-nul after the end of the
* formatted area of this structure.
*/
p += s->length;
while (!(p[0] == 0 && p[1] == 0))
p++;
/*
* Skip over the double-nul to the start of the next
* structure.
*/
p += 2;
}
}
/*
* Walk the SMBIOS table looking for an IPMI (type 38) entry. If we find
* one, return the parsed data in the passed in ipmi_get_info structure and
* return true. If we don't find one, return false.
*/
static void
ipmi_smbios_probe(struct ipmi_get_info *info)
{
struct smbios_table *header;
void *table;
u_int32_t addr;
bzero(info, sizeof(struct ipmi_get_info));
/* Find the SMBIOS table header. */
addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
SMBIOS_STEP, SMBIOS_OFF);
if (addr == 0)
return;
/*
* Map the header. We first map a fixed size to get the actual
* length and then map it a second time with the actual length so
* we can verify the checksum.
*/
header = pmap_mapbios(addr, sizeof(struct smbios_table));
table = pmap_mapbios(addr, header->length);
pmap_unmapbios((vm_offset_t)header, sizeof(struct smbios_table));
header = table;
if (smbios_cksum(header) != 0) {
pmap_unmapbios((vm_offset_t)header, header->length);
return;
}
/* Now map the actual table and walk it looking for an IPMI entry. */
table = pmap_mapbios(header->structure_table_address,
header->structure_table_length);
smbios_walk_table(table, header->number_structures, smbios_ipmi_info,
info);
/* Unmap everything. */
pmap_unmapbios((vm_offset_t)table, header->structure_table_length);
pmap_unmapbios((vm_offset_t)header, header->length);
}
/*
* Return the SMBIOS IPMI table entry info to the caller. If we haven't
* searched the IPMI table yet, search it. Otherwise, return a cached
* copy of the data.
*/
int
ipmi_smbios_identify(struct ipmi_get_info *info)
{
mtx_lock(&ipmi_info_mtx);
switch (ipmi_probed) {
case 0:
/* Need to probe the SMBIOS table. */
ipmi_probed++;
mtx_unlock(&ipmi_info_mtx);
ipmi_smbios_probe(&ipmi_info);
mtx_lock(&ipmi_info_mtx);
ipmi_probed++;
wakeup(&ipmi_info);
break;
case 1:
/* Another thread is currently probing the table, so wait. */
while (ipmi_probed == 1)
msleep(&ipmi_info, &ipmi_info_mtx, 0, "ipmi info", 0);
break;
default:
/* The cached data is available. */
break;
}
bcopy(&ipmi_info, info, sizeof(ipmi_info));
mtx_unlock(&ipmi_info_mtx);
return (info->iface_type != 0);
}
static int
smbios_cksum(struct smbios_table *e)
{
u_int8_t *ptr;
u_int8_t cksum;
int i;
ptr = (u_int8_t *)e;
cksum = 0;
for (i = 0; i < e->length; i++) {
cksum += ptr[i];
}
return (cksum);
}