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The orm device. This device gobbles up the Option ROMs in the ISA

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memory I/O space.  Otherwise, our resource allocation system might
mistakenly assign pccard, plug and play devices or other things
addresses that conflict with ROMs.

I cleaned up his code a little from the submited driver: style(9)
issues, commentary on why something that looks incorrect really is
correct.  Also noted that while a checksum field is defined for the
ROMs, enough common hardware neglects it to make it not worthwhile
checking.

Submitted by: Nikolai Saoukh <nms@otdel-1.org>
PR: 22078
This commit is contained in:
Warner Losh 2001-06-01 20:58:32 +00:00
parent 150cd07213
commit 3a4f29da1e
2 changed files with 186 additions and 0 deletions
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1
sys/conf/files
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@ -716,6 +716,7 @@ isa/isa_if.m optional isa
isa/isa_common.c optional isa
isa/isahint.c optional isa
isa/joy.c optional joy
isa/orm.c optional isa
isa/pnp.c optional isa
isa/pnpparse.c optional isa
isofs/cd9660/cd9660_bmap.c optional cd9660

185
sys/isa/orm.c Normal file
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@ -0,0 +1,185 @@
/*-
* Copyright (c) 2000 Nikolai Saoukh
* 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.
*
* $FreeBSD$
*/
/*
* Driver to take care of holes in ISA I/O memory occupied
* by option rom(s)
*/
#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 <isa/isavar.h>
#include <isa/pnpvar.h>
#define IOMEM_START 0x0a0000
#define IOMEM_STEP 0x000800
#define IOMEM_END 0x100000
#define ORM_ID 0x00004d3e
static struct isa_pnp_id orm_ids[] = {
{ ORM_ID, NULL }, /* ORM0000 */
{ 0, NULL },
};
#define MAX_ROMS 16
struct orm_softc {
int rnum;
int rid[MAX_ROMS];
struct resource *res[MAX_ROMS];
};
static int
orm_probe(device_t dev)
{
return (ISA_PNP_PROBE(device_get_parent(dev), dev, orm_ids));
}
static int
orm_attach(device_t dev)
{
return (0);
}
static void
orm_identify(driver_t* driver, device_t parent)
{
bus_space_handle_t bh;
bus_space_tag_t bt;
device_t child;
u_int32_t chunk = IOMEM_START;
struct resource *res;
int rid;
u_int32_t rom_size;
struct orm_softc *sc;
u_int8_t buf[3];
child = BUS_ADD_CHILD(parent, ISA_ORDER_SENSITIVE, "orm", -1);
device_set_driver(child, driver);
isa_set_logicalid(child, ORM_ID);
isa_set_vendorid(child, ORM_ID);
sc = device_get_softc(child);
sc->rnum = 0;
while (chunk < IOMEM_END) {
bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk,
IOMEM_STEP);
rid = sc->rnum;
res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul,
~0ul, IOMEM_STEP, RF_ACTIVE);
if (res == NULL) {
bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
chunk += IOMEM_STEP;
continue;
}
bt = rman_get_bustag(res);
bh = rman_get_bushandle(res);
bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf));
/*
* We need to release and delete the resource since we're
* changing its size, or the rom isn't there. There
* is a checksum field in the ROM to prevent false
* positives. However, some common hardware (IBM thinkpads)
* neglects to put a valid checksum in the ROM, so we do
* not double check the checksum here. On the ISA bus
* areas that have no hardware read back as 0xff, so the
* tests to see if we have 0x55 followed by 0xaa are
* generally sufficient.
*/
bus_release_resource(child, SYS_RES_MEMORY, rid, res);
bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
if (buf[0] != 0x55 || buf[1] != 0xAA || (buf[2] & 0x03) != 0) {
chunk += IOMEM_STEP;
continue;
}
rom_size = buf[2] << 9;
bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk,
rom_size);
rid = sc->rnum;
res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul,
~0ul, rom_size, 0);
if (res == NULL) {
bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
chunk += IOMEM_STEP;
continue;
}
sc->rid[sc->rnum] = rid;
sc->res[sc->rnum] = res;
sc->rnum++;
chunk += rom_size;
}
if (sc->rnum == 0)
device_delete_child(parent, child);
else if (sc->rnum == 1)
device_set_desc(child, "Option ROM");
else
device_set_desc(child, "Option ROMs");
}
static int
orm_detach(device_t dev)
{
int i;
struct orm_softc *sc = device_get_softc(dev);
for (i = 0; i < sc->rnum; i++)
bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i],
sc->res[i]);
return (0);
}
static device_method_t orm_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, orm_identify),
DEVMETHOD(device_probe, orm_probe),
DEVMETHOD(device_attach, orm_attach),
DEVMETHOD(device_detach, orm_detach),
{ 0, 0 }
};
static driver_t orm_driver = {
"orm",
orm_methods,
sizeof (struct orm_softc)
};
static devclass_t orm_devclass;
DRIVER_MODULE(orm, isa, orm_driver, orm_devclass, 0, 0);