FreeBSD-5.3/sys/i386/bios/smapi.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: src/sys/i386/bios/smapi.c,v 1.13 2004/06/16 09:47:07 phk Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
/* And all this for BIOS_PADDRTOVADDR() */
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <machine/md_var.h>
#include <machine/pc/bios.h>
#include <machine/smapi.h>
#define SMAPI_START 0xf0000
#define SMAPI_STEP 0x10
#define SMAPI_OFF 0
#define SMAPI_LEN 4
#define SMAPI_SIG "$SMB"
#define RES2HDR(res) ((struct smapi_bios_header *)rman_get_virtual(res))
#define ADDR2HDR(addr) ((struct smapi_bios_header *)BIOS_PADDRTOVADDR(addr))
struct smapi_softc {
struct cdev *cdev;
device_t dev;
struct resource * res;
int rid;
u_int32_t smapi32_entry;
struct smapi_bios_header *header;
};
extern u_long smapi32_offset;
extern u_short smapi32_segment;
devclass_t smapi_devclass;
static d_ioctl_t smapi_ioctl;
static struct cdevsw smapi_cdevsw = {
.d_version = D_VERSION,
.d_ioctl = smapi_ioctl,
.d_name = "smapi",
.d_flags = D_MEM | D_NEEDGIANT,
};
static void smapi_identify (driver_t *, device_t);
static int smapi_probe (device_t);
static int smapi_attach (device_t);
static int smapi_detach (device_t);
static int smapi_modevent (module_t, int, void *);
static int smapi_header_cksum (struct smapi_bios_header *);
extern int smapi32 (struct smapi_bios_parameter *,
struct smapi_bios_parameter *);
extern int smapi32_new (u_long, u_short,
struct smapi_bios_parameter *,
struct smapi_bios_parameter *);
static int
smapi_ioctl (dev, cmd, data, fflag, td)
struct cdev *dev;
u_long cmd;
caddr_t data;
int fflag;
d_thread_t * td;
{
struct smapi_softc *sc;
int error;
error = 0;
sc = devclass_get_softc(smapi_devclass, minor(dev));
if (sc == NULL) {
error = ENXIO;
goto fail;
}
switch (cmd) {
case SMAPIOGHEADER:
bcopy((caddr_t)sc->header, data,
sizeof(struct smapi_bios_header));
error = 0;
break;
case SMAPIOCGFUNCTION:
smapi32_offset = sc->smapi32_entry;
error = smapi32((struct smapi_bios_parameter *)data,
(struct smapi_bios_parameter *)data);
break;
default:
error = ENOTTY;
}
fail:
return (error);
}
static int
smapi_header_cksum (struct smapi_bios_header *header)
{
u_int8_t *ptr;
u_int8_t cksum;
int i;
ptr = (u_int8_t *)header;
cksum = 0;
for (i = 0; i < header->length; i++) {
cksum += ptr[i];
}
return (cksum);
}
static void
smapi_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(SMAPI_START, SMAPI_SIG, SMAPI_LEN,
SMAPI_STEP, SMAPI_OFF);
if (addr != 0) {
rid = 0;
length = ADDR2HDR(addr)->length;
child = BUS_ADD_CHILD(parent, 0, "smapi", -1);
device_set_driver(child, driver);
bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
device_set_desc(child, "SMAPI BIOS");
}
return;
}
static int
smapi_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 (smapi_header_cksum(RES2HDR(res))) {
device_printf(dev, "SMAPI header checksum failed.\n");
error = ENXIO;
goto bad;
}
bad:
if (res)
bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
return (error);
}
static int
smapi_attach (device_t dev)
{
struct smapi_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->header = (struct smapi_bios_header *)rman_get_virtual(sc->res);
sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR(
sc->header->prot32_segment +
sc->header->prot32_offset);
sc->cdev = make_dev(&smapi_cdevsw,
device_get_unit(sc->dev),
UID_ROOT, GID_WHEEL, 0600,
"%s%d",
smapi_cdevsw.d_name,
device_get_unit(sc->dev));
device_printf(dev, "Version: %d.%02d, Length: %d, Checksum: 0x%02x\n",
bcd2bin(sc->header->version_major),
bcd2bin(sc->header->version_minor),
sc->header->length,
sc->header->checksum);
device_printf(dev, "Information=0x%b\n",
sc->header->information,
"\020"
"\001REAL_VM86"
"\002PROTECTED_16"
"\003PROTECTED_32");
if (bootverbose) {
if (sc->header->information & SMAPI_REAL_VM86)
device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n",
sc->header->real16_segment,
sc->header->real16_offset);
if (sc->header->information & SMAPI_PROT_16BIT)
device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n",
sc->header->prot16_segment,
sc->header->prot16_offset);
if (sc->header->information & SMAPI_PROT_32BIT)
device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n",
sc->header->prot32_segment,
sc->header->prot32_offset);
}
return (0);
bad:
if (sc->res)
bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
return (error);
}
static int
smapi_detach (device_t dev)
{
struct smapi_softc *sc;
sc = device_get_softc(dev);
destroy_dev(sc->cdev);
if (sc->res)
bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
return (0);
}
static int
smapi_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(smapi_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 smapi_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, smapi_identify),
DEVMETHOD(device_probe, smapi_probe),
DEVMETHOD(device_attach, smapi_attach),
DEVMETHOD(device_detach, smapi_detach),
{ 0, 0 }
};
static driver_t smapi_driver = {
"smapi",
smapi_methods,
sizeof(struct smapi_softc),
};
DRIVER_MODULE(smapi, nexus, smapi_driver, smapi_devclass, smapi_modevent, 0);
MODULE_VERSION(smapi, 1);