278 lines
6.8 KiB
C
278 lines
6.8 KiB
C
/*-
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* Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/rman.h>
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/* And all this for BIOS_PADDRTOVADDR() */
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/md_var.h>
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#include <machine/pc/bios.h>
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#include <machine/smapi.h>
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#include <i386/smapi/smapi_var.h>
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static void smapi_isa_identify (driver_t *, device_t);
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static int smapi_isa_probe (device_t);
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static int smapi_isa_attach (device_t);
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static int smapi_isa_detach (device_t);
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static int smapi_modevent (module_t, int, void *);
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static int smapi_header_cksum (struct smapi_bios_header *);
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#define SMAPI_START 0xf0000
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#define SMAPI_END 0xffff0
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#define SMAPI_STEP 0x10
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#define SMAPI_SIGNATURE(h) ((h->signature[0] == '$') && \
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(h->signature[1] == 'S') && \
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(h->signature[2] == 'M') && \
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(h->signature[3] == 'B'))
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#define RES2HEADER(res) ((struct smapi_bios_header *)rman_get_virtual(res))
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static void
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smapi_isa_identify (driver_t *driver, device_t parent)
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{
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device_t child;
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struct resource *res;
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u_int32_t chunk;
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int rid;
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rid = 0;
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chunk = SMAPI_START;
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child = BUS_ADD_CHILD(parent, 0, "smapi", -1);
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device_set_driver(child, driver);
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while (chunk < SMAPI_END) {
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bus_set_resource(child, SYS_RES_MEMORY, rid, chunk,
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sizeof(struct smapi_bios_header));
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res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid,
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0ul, ~0ul, 1, RF_ACTIVE);
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if (res == NULL) {
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bus_delete_resource(child, SYS_RES_MEMORY, rid);
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chunk += SMAPI_STEP;
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continue;
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}
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if (SMAPI_SIGNATURE(RES2HEADER(res))) {
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goto found;
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} else {
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bus_release_resource(child, SYS_RES_MEMORY, rid, res);
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bus_delete_resource(child, SYS_RES_MEMORY, rid);
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}
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chunk += SMAPI_STEP;
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}
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device_delete_child(parent, child);
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return;
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found:
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bus_release_resource(child, SYS_RES_MEMORY, rid, res);
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device_set_desc(child, "SMAPI BIOS");
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return;
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}
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static int
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smapi_isa_probe (device_t dev)
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{
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struct resource *res;
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int rid;
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int error;
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error = 0;
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rid = 0;
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res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
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0ul, ~0ul, 1, RF_ACTIVE);
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if (res == NULL) {
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device_printf(dev, "Unable to allocate memory resource.\n");
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error = ENOMEM;
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goto bad;
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}
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if (smapi_header_cksum(RES2HEADER(res))) {
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device_printf(dev, "SMAPI header checksum failed.\n");
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error = ENXIO;
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goto bad;
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}
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bad:
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if (res)
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bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
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return (error);
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}
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static int
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smapi_isa_attach (device_t dev)
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{
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struct smapi_softc *sc;
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int error;
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sc = device_get_softc(dev);
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error = 0;
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sc->dev = dev;
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sc->rid = 0;
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sc->res = bus_alloc_resource(dev, SYS_RES_MEMORY, &sc->rid,
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0ul, ~0ul, 1, RF_ACTIVE);
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if (sc->res == NULL) {
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device_printf(dev, "Unable to allocate memory resource.\n");
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error = ENOMEM;
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goto bad;
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}
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sc->header = (struct smapi_bios_header *)rman_get_virtual(sc->res);
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sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR(
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sc->header->prot32_segment +
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sc->header->prot32_offset);
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if (smapi_attach(sc)) {
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device_printf(dev, "SMAPI attach failed.\n");
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error = ENXIO;
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goto bad;
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}
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device_printf(dev, "Version %d.%02d, Length %d, Checksum 0x%02x\n",
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bcd2bin(sc->header->version_major),
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bcd2bin(sc->header->version_minor),
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sc->header->length,
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sc->header->checksum);
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device_printf(dev, "Information=0x%b\n",
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sc->header->information,
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"\020"
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"\001REAL_VM86"
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"\002PROTECTED_16"
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"\003PROTECTED_32");
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if (bootverbose) {
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if (sc->header->information & SMAPI_REAL_VM86)
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device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n",
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sc->header->real16_segment,
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sc->header->real16_offset);
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if (sc->header->information & SMAPI_PROT_16BIT)
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device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n",
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sc->header->prot16_segment,
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sc->header->prot16_offset);
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if (sc->header->information & SMAPI_PROT_32BIT)
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device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n",
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sc->header->prot32_segment,
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sc->header->prot32_offset);
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}
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return (0);
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bad:
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if (sc->res)
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bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
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return (error);
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}
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static int
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smapi_isa_detach (device_t dev)
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{
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struct smapi_softc *sc;
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sc = device_get_softc(dev);
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(void)smapi_detach(sc);
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if (sc->res)
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bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
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return (0);
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}
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static int
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smapi_modevent (mod, what, arg)
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module_t mod;
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int what;
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void * arg;
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{
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device_t * devs;
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int count;
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int i;
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switch (what) {
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case MOD_LOAD:
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break;
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case MOD_UNLOAD:
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devclass_get_devices(smapi_devclass, &devs, &count);
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for (i = 0; i < count; i++) {
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device_delete_child(device_get_parent(devs[i]), devs[i]);
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}
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break;
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default:
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break;
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}
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return (0);
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}
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static device_method_t smapi_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, smapi_isa_identify),
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DEVMETHOD(device_probe, smapi_isa_probe),
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DEVMETHOD(device_attach, smapi_isa_attach),
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DEVMETHOD(device_detach, smapi_isa_detach),
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{ 0, 0 }
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};
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static driver_t smapi_driver = {
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"smapi",
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smapi_methods,
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sizeof(struct smapi_softc),
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};
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DRIVER_MODULE(smapi, legacy, smapi_driver, smapi_devclass, smapi_modevent, 0);
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MODULE_VERSION(smapi, 1);
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static int
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smapi_header_cksum (struct smapi_bios_header *header)
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{
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u_int8_t *ptr;
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u_int8_t cksum;
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int i;
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ptr = (u_int8_t *)header;
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cksum = 0;
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for (i = 0; i < header->length; i++) {
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cksum += ptr[i];
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}
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return (cksum);
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}
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