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/*-
* 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.
*
* $FreeBSD$
*/
#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>
/* And all this for BIOS_PADDRTOVADDR() */
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/md_var.h>
#include <machine/pc/bios.h>
#include <machine/smapi.h>
#include <i386/smapi/smapi_var.h>
static void smapi_isa_identify (driver_t *, device_t);
static int smapi_isa_probe (device_t);
static int smapi_isa_attach (device_t);
static int smapi_isa_detach (device_t);
static int smapi_modevent (module_t, int, void *);
static int smapi_header_cksum (struct smapi_bios_header *);
#define SMAPI_START 0xf0000
#define SMAPI_END 0xffff0
#define SMAPI_STEP 0x10
#define SMAPI_SIGNATURE(h) ((h->signature[0] == '$') && \
(h->signature[1] == 'S') && \
(h->signature[2] == 'M') && \
(h->signature[3] == 'B'))
#define RES2HEADER(res) ((struct smapi_bios_header *)rman_get_virtual(res))
static void
smapi_isa_identify (driver_t *driver, device_t parent)
{
device_t child;
struct resource *res;
u_int32_t chunk;
int rid;
rid = 0;
chunk = SMAPI_START;
child = BUS_ADD_CHILD(parent, 0, "smapi", -1);
device_set_driver(child, driver);
while (chunk < SMAPI_END) {
bus_set_resource(child, SYS_RES_MEMORY, rid, chunk,
sizeof(struct smapi_bios_header));
res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid,
0ul, ~0ul, 1, RF_ACTIVE);
if (res == NULL) {
bus_delete_resource(child, SYS_RES_MEMORY, rid);
chunk += SMAPI_STEP;
continue;
}
if (SMAPI_SIGNATURE(RES2HEADER(res))) {
goto found;
} else {
bus_release_resource(child, SYS_RES_MEMORY, rid, res);
bus_delete_resource(child, SYS_RES_MEMORY, rid);
}
chunk += SMAPI_STEP;
}
device_delete_child(parent, child);
return;
found:
bus_release_resource(child, SYS_RES_MEMORY, rid, res);
device_set_desc(child, "SMAPI BIOS");
return;
}
static int
smapi_isa_probe (device_t dev)
{
struct resource *res;
int rid;
int error;
error = 0;
rid = 0;
res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
0ul, ~0ul, 1, RF_ACTIVE);
if (res == NULL) {
device_printf(dev, "Unable to allocate memory resource.\n");
error = ENOMEM;
goto bad;
}
if (smapi_header_cksum(RES2HEADER(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_isa_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(dev, SYS_RES_MEMORY, &sc->rid,
0ul, ~0ul, 1, 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);
if (smapi_attach(sc)) {
device_printf(dev, "SMAPI attach failed.\n");
error = ENXIO;
goto bad;
}
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_isa_detach (device_t dev)
{
struct smapi_softc *sc;
sc = device_get_softc(dev);
(void)smapi_detach(sc);
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_isa_identify),
DEVMETHOD(device_probe, smapi_isa_probe),
DEVMETHOD(device_attach, smapi_isa_attach),
DEVMETHOD(device_detach, smapi_isa_detach),
{ 0, 0 }
};
static driver_t smapi_driver = {
"smapi",
smapi_methods,
sizeof(struct smapi_softc),
};
DRIVER_MODULE(smapi, legacy, smapi_driver, smapi_devclass, smapi_modevent, 0);
MODULE_VERSION(smapi, 1);
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);
}
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