Introduce the new kernel sub-tree x86 which should contain all the code

shared and generalized between our current amd64, i386 and pc98.

This is just an initial step that should lead to a more complete effort.
For the moment, a very simple porting of cpufreq modules, BIOS calls and
the whole MD specific ISA bus part is added to the sub-tree but ideally
a lot of code might be added and more shared support should grow.

Sponsored by:	Sandvine Incorporated
Reviewed by:	emaste, kib, jhb, imp
Discussed on:	arch
MFC:		3 weeks

1 files changed, 277 insertions, 0 deletions

diff --git a/sys/x86/bios/smbios.c b/sys/x86/bios/smbios.c
new file mode 100644
index 0000000..f38d985
--- /dev/null
+++ b/sys/x86/bios/smbios.c
@@ -0,0 +1,277 @@
+/*-
+ * 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("$FreeBSD$");
+
+#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 <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+#include <machine/md_var.h>
+#include <machine/pc/bios.h>
+
+/*
+ * System Management BIOS Reference Specification, v2.4 Final
+ * http://www.dmtf.org/standards/published_documents/DSP0134.pdf
+ */
+
+/*
+ * SMBIOS Entry Point Structure
+ */
+struct smbios_eps {
+	u_int8_t	Anchor[4];		/* '_SM_' */
+	u_int8_t	Checksum;
+	u_int8_t	Length;
+
+	u_int8_t	SMBIOS_Major;
+	u_int8_t	SMBIOS_Minor;
+	u_int16_t	Max_Size;
+	u_int8_t	Revision;
+	u_int8_t	Formatted_Area[5];
+
+	u_int8_t	Intermediate_Anchor[5];	/* '_DMI_' */
+	u_int8_t	Intermediate_Checksum;
+
+	u_int16_t	Structure_Table_Length;
+	u_int32_t	Structure_Table_Address;
+	u_int16_t	Structure_Count;
+
+	u_int8_t	SMBIOS_BCD_Revision;
+} __packed;
+
+struct smbios_softc {
+	device_t		dev;
+	struct resource *	res;
+	int			rid;
+
+	struct smbios_eps *	eps;
+};
+
+#define	SMBIOS_START	0xf0000
+#define	SMBIOS_STEP	0x10
+#define	SMBIOS_OFF	0
+#define	SMBIOS_LEN	4
+#define	SMBIOS_SIG	"_SM_"
+
+#define	RES2EPS(res)	((struct smbios_eps *)rman_get_virtual(res))
+#define	ADDR2EPS(addr)  ((struct smbios_eps *)BIOS_PADDRTOVADDR(addr))
+
+static devclass_t	smbios_devclass;
+
+static void	smbios_identify	(driver_t *, device_t);
+static int	smbios_probe	(device_t);
+static int	smbios_attach	(device_t);
+static int	smbios_detach	(device_t);
+static int	smbios_modevent	(module_t, int, void *);
+
+static int	smbios_cksum	(struct smbios_eps *);
+
+static void
+smbios_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(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
+			      SMBIOS_STEP, SMBIOS_OFF);
+	if (addr != 0) {
+		rid = 0;
+		length = ADDR2EPS(addr)->Length;
+
+		if (length != 0x1f) {
+			u_int8_t major, minor;
+
+			major = ADDR2EPS(addr)->SMBIOS_Major;
+			minor = ADDR2EPS(addr)->SMBIOS_Minor;
+
+			/* SMBIOS v2.1 implementation might use 0x1e. */
+			if (length == 0x1e && major == 2 && minor == 1)
+				length = 0x1f;
+			else
+				return;
+		}
+
+		child = BUS_ADD_CHILD(parent, 5, "smbios", -1);
+		device_set_driver(child, driver);
+		bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
+		device_set_desc(child, "System Management BIOS");
+	}
+
+	return;
+}
+
+static int
+smbios_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 (smbios_cksum(RES2EPS(res))) {
+		device_printf(dev, "SMBIOS checksum failed.\n");
+		error = ENXIO;
+		goto bad;
+	}
+
+bad:
+	if (res)
+		bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
+	return (error);
+}
+
+static int
+smbios_attach (device_t dev)
+{
+	struct smbios_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->eps = RES2EPS(sc->res);
+
+	device_printf(dev, "Version: %u.%u",
+		sc->eps->SMBIOS_Major, sc->eps->SMBIOS_Minor);
+	if (bcd2bin(sc->eps->SMBIOS_BCD_Revision))
+		printf(", BCD Revision: %u.%u",
+			bcd2bin(sc->eps->SMBIOS_BCD_Revision >> 4),
+			bcd2bin(sc->eps->SMBIOS_BCD_Revision & 0x0f));
+	printf("\n");
+
+	return (0);
+bad:
+	if (sc->res)
+		bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
+	return (error);
+}
+
+static int
+smbios_detach (device_t dev)
+{
+	struct smbios_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	if (sc->res)
+		bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
+
+	return (0);
+}
+
+static int
+smbios_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(smbios_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 smbios_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_identify,      smbios_identify),
+	DEVMETHOD(device_probe,         smbios_probe),
+	DEVMETHOD(device_attach,        smbios_attach),
+	DEVMETHOD(device_detach,        smbios_detach),
+	{ 0, 0 }
+};
+
+static driver_t smbios_driver = {
+	"smbios",
+	smbios_methods,
+	sizeof(struct smbios_softc),
+};
+
+DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0);
+MODULE_VERSION(smbios, 1);
+
+static int
+smbios_cksum (struct smbios_eps *e)
+{
+	u_int8_t *ptr;
+	u_int8_t cksum;
+	int i;
+
+	ptr = (u_int8_t *)e;
+	cksum = 0;
+	for (i = 0; i < e->Length; i++) {
+		cksum += ptr[i];
+	}
+
+	return (cksum);
+}