freebsd-dev/sys/i386/bios/smbios.c
John Baldwin ce533e82a2 Tweak the probe/attach order of devices on the x86 nexus devices.
Various BIOS-related psuedo-devices are added at an order of 5.  acpi0 is
added at an order of 10, and legacy0 is added at an order of 11.
2007-03-20 20:21:44 +00:00

278 lines
6.3 KiB
C

/*-
* Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net>
* 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/kernel.h>
#include <sys/socket.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <machine/md_var.h>
#include <machine/pc/bios.h>
/*
* System Management BIOS Reference Specification, v2.4 Final
* http://www.dmtf.org/standards/published_documents/DSP0134.pdf
*/
/*
* SMBIOS Entry Point Structure
*/
struct smbios_eps {
u_int8_t Anchor[4]; /* '_SM_' */
u_int8_t Checksum;
u_int8_t Length;
u_int8_t SMBIOS_Major;
u_int8_t SMBIOS_Minor;
u_int16_t Max_Size;
u_int8_t Revision;
u_int8_t Formatted_Area[5];
u_int8_t Intermediate_Anchor[5]; /* '_DMI_' */
u_int8_t Intermediate_Checksum;
u_int16_t Structure_Table_Length;
u_int32_t Structure_Table_Address;
u_int16_t Structure_Count;
u_int8_t SMBIOS_BCD_Revision;
} __packed;
struct smbios_softc {
device_t dev;
struct resource * res;
int rid;
struct smbios_eps * eps;
};
#define SMBIOS_START 0xf0000
#define SMBIOS_STEP 0x10
#define SMBIOS_OFF 0
#define SMBIOS_LEN 4
#define SMBIOS_SIG "_SM_"
#define RES2EPS(res) ((struct smbios_eps *)rman_get_virtual(res))
#define ADDR2EPS(addr) ((struct smbios_eps *)BIOS_PADDRTOVADDR(addr))
static devclass_t smbios_devclass;
static void smbios_identify (driver_t *, device_t);
static int smbios_probe (device_t);
static int smbios_attach (device_t);
static int smbios_detach (device_t);
static int smbios_modevent (module_t, int, void *);
static int smbios_cksum (struct smbios_eps *);
static void
smbios_identify (driver_t *driver, device_t parent)
{
device_t child;
u_int32_t addr;
int length;
int rid;
if (!device_is_alive(parent))
return;
addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
SMBIOS_STEP, SMBIOS_OFF);
if (addr != 0) {
rid = 0;
length = ADDR2EPS(addr)->Length;
if (length != 0x1f) {
u_int8_t major, minor;
major = ADDR2EPS(addr)->SMBIOS_Major;
minor = ADDR2EPS(addr)->SMBIOS_Minor;
/* SMBIOS v2.1 implementation might use 0x1e. */
if (length == 0x1e && major == 2 && minor == 1)
length = 0x1f;
else
return;
}
child = BUS_ADD_CHILD(parent, 5, "smbios", -1);
device_set_driver(child, driver);
bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
device_set_desc(child, "System Management BIOS");
}
return;
}
static int
smbios_probe (device_t dev)
{
struct resource *res;
int rid;
int error;
error = 0;
rid = 0;
res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (res == NULL) {
device_printf(dev, "Unable to allocate memory resource.\n");
error = ENOMEM;
goto bad;
}
if (smbios_cksum(RES2EPS(res))) {
device_printf(dev, "SMBIOS checksum failed.\n");
error = ENXIO;
goto bad;
}
bad:
if (res)
bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
return (error);
}
static int
smbios_attach (device_t dev)
{
struct smbios_softc *sc;
int error;
sc = device_get_softc(dev);
error = 0;
sc->dev = dev;
sc->rid = 0;
sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
RF_ACTIVE);
if (sc->res == NULL) {
device_printf(dev, "Unable to allocate memory resource.\n");
error = ENOMEM;
goto bad;
}
sc->eps = RES2EPS(sc->res);
device_printf(dev, "Version: %u.%u",
sc->eps->SMBIOS_Major, sc->eps->SMBIOS_Minor);
if (bcd2bin(sc->eps->SMBIOS_BCD_Revision))
printf(", BCD Revision: %u.%u",
bcd2bin(sc->eps->SMBIOS_BCD_Revision >> 4),
bcd2bin(sc->eps->SMBIOS_BCD_Revision & 0x0f));
printf("\n");
return (0);
bad:
if (sc->res)
bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
return (error);
}
static int
smbios_detach (device_t dev)
{
struct smbios_softc *sc;
sc = device_get_softc(dev);
if (sc->res)
bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
return (0);
}
static int
smbios_modevent (mod, what, arg)
module_t mod;
int what;
void * arg;
{
device_t * devs;
int count;
int i;
switch (what) {
case MOD_LOAD:
break;
case MOD_UNLOAD:
devclass_get_devices(smbios_devclass, &devs, &count);
for (i = 0; i < count; i++) {
device_delete_child(device_get_parent(devs[i]), devs[i]);
}
break;
default:
break;
}
return (0);
}
static device_method_t smbios_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, smbios_identify),
DEVMETHOD(device_probe, smbios_probe),
DEVMETHOD(device_attach, smbios_attach),
DEVMETHOD(device_detach, smbios_detach),
{ 0, 0 }
};
static driver_t smbios_driver = {
"smbios",
smbios_methods,
sizeof(struct smbios_softc),
};
DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0);
MODULE_VERSION(smbios, 1);
static int
smbios_cksum (struct smbios_eps *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);
}