Add /dev/vcio, userland access point to VideoCore mailbox property channel

It's required by some applications in raspberrypi-userland package

sys/arm/broadcom/bcm2835/bcm2835_vcio.c

@@ -0,0 +1,122 @@
+/*-
+ * Copyright (c) 2015 Oleksandr Tymoshenko <gonzo@freebsd.org>
+ *
+ * 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/malloc.h>
+#include <sys/module.h>
+#include <sys/ioccom.h>
+#include <sys/conf.h>
+#include <sys/proc.h>
+
+#include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
+
+MALLOC_DECLARE(M_VCIO);
+MALLOC_DEFINE(M_VCIO, "vcio", "VCIO temporary buffers");
+
+static struct cdev *sdev;
+static d_ioctl_t vcio_ioctl;
+
+static struct cdevsw vcio_devsw = {
+	/* version */	.d_version = D_VERSION,
+	/* ioctl */	.d_ioctl = vcio_ioctl,
+};
+
+#define VCIO_IOC_MAGIC 100
+#define IOCTL_MBOX_PROPERTY _IOWR(VCIO_IOC_MAGIC, 0, char *)
+
+int
+vcio_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode,
+    struct thread *td)
+{
+    int error;
+    void *ptr;
+    uint32_t size;
+    uint8_t *property;
+
+    error = 0;
+    switch(cmd) {
+    case IOCTL_MBOX_PROPERTY:
+    	memcpy (&ptr, arg, sizeof(ptr));
+	error = copyin(ptr, &size, sizeof(size));
+
+	if (error != 0)
+		break;
+	property = malloc(size, M_VCIO, M_WAITOK);
+	if (property == NULL) {
+		error = ENOMEM;
+		break;
+	}
+
+	error = copyin(ptr, property, size);
+	if (error) {
+		free(property, M_VCIO);
+		break;
+	}
+
+	error = bcm2835_mbox_property(property, size);
+	if (error) {
+		free(property, M_VCIO);
+		break;
+	}
+
+	error = copyout(property, ptr, size);
+	free(property, M_VCIO);
+
+	break;
+    default:
+	error = EINVAL;
+	break;
+    }
+    return (error);
+}
+
+static int
+vcio_load(module_t mod, int cmd, void *arg)
+{
+    int  err = 0;
+
+    switch (cmd) {
+    case MOD_LOAD:
+	sdev = make_dev(&vcio_devsw, 0, UID_ROOT, GID_WHEEL, 0600, "vcio");
+	break;
+
+    case MOD_UNLOAD:
+	destroy_dev(sdev);
+	break;
+
+    default:
+	err = EOPNOTSUPP;
+	break;
+    }
+
+    return(err);
+}
+
+DEV_MODULE(vcio, vcio_load, NULL);
+MODULE_DEPEND(vcio, mbox, 1, 1, 1);

sys/arm/broadcom/bcm2835/files.bcm283x

@@ -12,6 +12,7 @@ arm/broadcom/bcm2835/bcm2835_machdep.c		standard
 arm/broadcom/bcm2835/bcm2835_mbox.c		standard
 arm/broadcom/bcm2835/bcm2835_sdhci.c		optional sdhci
 arm/broadcom/bcm2835/bcm2835_spi.c		optional bcm2835_spi
+arm/broadcom/bcm2835/bcm2835_vcio.c		standard
 arm/broadcom/bcm2835/bcm2835_wdog.c		standard
 arm/broadcom/bcm2835/bcm283x_dwc_fdt.c		optional dwcotg fdt