ce533e82a2
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.
278 lines
6.3 KiB
C
278 lines
6.3 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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#include <vm/vm.h>
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#include <vm/vm_param.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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/*
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* System Management BIOS Reference Specification, v2.4 Final
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* http://www.dmtf.org/standards/published_documents/DSP0134.pdf
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*/
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/*
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* SMBIOS Entry Point Structure
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*/
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struct smbios_eps {
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u_int8_t Anchor[4]; /* '_SM_' */
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u_int8_t Checksum;
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u_int8_t Length;
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u_int8_t SMBIOS_Major;
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u_int8_t SMBIOS_Minor;
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u_int16_t Max_Size;
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u_int8_t Revision;
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u_int8_t Formatted_Area[5];
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u_int8_t Intermediate_Anchor[5]; /* '_DMI_' */
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u_int8_t Intermediate_Checksum;
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u_int16_t Structure_Table_Length;
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u_int32_t Structure_Table_Address;
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u_int16_t Structure_Count;
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u_int8_t SMBIOS_BCD_Revision;
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} __packed;
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struct smbios_softc {
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device_t dev;
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struct resource * res;
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int rid;
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struct smbios_eps * eps;
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};
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#define SMBIOS_START 0xf0000
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#define SMBIOS_STEP 0x10
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#define SMBIOS_OFF 0
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#define SMBIOS_LEN 4
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#define SMBIOS_SIG "_SM_"
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#define RES2EPS(res) ((struct smbios_eps *)rman_get_virtual(res))
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#define ADDR2EPS(addr) ((struct smbios_eps *)BIOS_PADDRTOVADDR(addr))
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static devclass_t smbios_devclass;
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static void smbios_identify (driver_t *, device_t);
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static int smbios_probe (device_t);
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static int smbios_attach (device_t);
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static int smbios_detach (device_t);
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static int smbios_modevent (module_t, int, void *);
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static int smbios_cksum (struct smbios_eps *);
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static void
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smbios_identify (driver_t *driver, device_t parent)
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{
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device_t child;
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u_int32_t addr;
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int length;
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int rid;
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if (!device_is_alive(parent))
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return;
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addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
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SMBIOS_STEP, SMBIOS_OFF);
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if (addr != 0) {
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rid = 0;
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length = ADDR2EPS(addr)->Length;
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if (length != 0x1f) {
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u_int8_t major, minor;
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major = ADDR2EPS(addr)->SMBIOS_Major;
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minor = ADDR2EPS(addr)->SMBIOS_Minor;
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/* SMBIOS v2.1 implementation might use 0x1e. */
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if (length == 0x1e && major == 2 && minor == 1)
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length = 0x1f;
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else
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return;
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}
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child = BUS_ADD_CHILD(parent, 5, "smbios", -1);
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device_set_driver(child, driver);
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bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
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device_set_desc(child, "System Management BIOS");
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}
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return;
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}
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static int
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smbios_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_any(dev, SYS_RES_MEMORY, &rid, 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 (smbios_cksum(RES2EPS(res))) {
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device_printf(dev, "SMBIOS 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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smbios_attach (device_t dev)
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{
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struct smbios_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_any(dev, SYS_RES_MEMORY, &sc->rid,
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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->eps = RES2EPS(sc->res);
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device_printf(dev, "Version: %u.%u",
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sc->eps->SMBIOS_Major, sc->eps->SMBIOS_Minor);
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if (bcd2bin(sc->eps->SMBIOS_BCD_Revision))
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printf(", BCD Revision: %u.%u",
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bcd2bin(sc->eps->SMBIOS_BCD_Revision >> 4),
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bcd2bin(sc->eps->SMBIOS_BCD_Revision & 0x0f));
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printf("\n");
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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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smbios_detach (device_t dev)
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{
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struct smbios_softc *sc;
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sc = device_get_softc(dev);
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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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smbios_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(smbios_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 smbios_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, smbios_identify),
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DEVMETHOD(device_probe, smbios_probe),
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DEVMETHOD(device_attach, smbios_attach),
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DEVMETHOD(device_detach, smbios_detach),
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{ 0, 0 }
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};
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static driver_t smbios_driver = {
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"smbios",
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smbios_methods,
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sizeof(struct smbios_softc),
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};
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DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0);
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MODULE_VERSION(smbios, 1);
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static int
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smbios_cksum (struct smbios_eps *e)
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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 *)e;
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cksum = 0;
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for (i = 0; i < e->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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