Break out the MI part of the /dev/[k]mem and /dev/io drivers into

their own directory and module, leaving the MD parts in the MD
area (the MD parts _are_ part of the modules). /dev/mem and /dev/io
are now loadable modules, thus taking us one step further towards
a kernel created entirely out of modules. Of course, there is nothing
preventing the kernel from having these statically compiled.

1 files changed, 108 insertions, 0 deletions

diff --git a/sys/dev/mem/memdev.c b/sys/dev/mem/memdev.c
new file mode 100644
index 0000000..290259a
--- /dev/null
+++ b/sys/dev/mem/memdev.c
@@ -0,0 +1,108 @@
+/*-
+ * Copyright (c) 2004 Mark R V Murray
+ * 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
+ *    in this position and unchanged.
+ * 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 AUTHORS ``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 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/conf.h>
+#include <sys/fcntl.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/memrange.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+#include <sys/signalvar.h>
+#include <sys/systm.h>
+#include <sys/uio.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <machine/memdev.h>
+
+static struct cdev *memdev, *kmemdev;
+
+static struct cdevsw mem_cdevsw = {
+	.d_version =	D_VERSION,
+	.d_flags =	D_MEM|D_NEEDGIANT,
+	.d_open =	memopen,
+	.d_read =	memrw,
+	.d_write =	memrw,
+	.d_ioctl =	memioctl,
+	.d_mmap =	memmmap,
+	.d_name =	"mem",
+};
+
+/* ARGSUSED */
+int
+memopen(struct cdev *dev __unused, int flags, int fmt __unused,
+    struct thread *td)
+{
+	int error = 0;
+
+	if (flags & FWRITE)
+		error = securelevel_gt(td->td_ucred, 0);
+
+	return (error);
+}
+
+/* ARGSUSED */
+static int
+mem_modevent(module_t mod __unused, int type, void *data __unused)
+{
+	switch(type) {
+	case MOD_LOAD:
+		if (bootverbose)
+			printf("mem: <memory>\n");
+		dev_mem_md_init(); /* Machine dependant bit */
+		memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
+			UID_ROOT, GID_KMEM, 0640, "mem");
+		kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
+			UID_ROOT, GID_KMEM, 0640, "kmem");
+		break;
+
+	case MOD_UNLOAD:
+		destroy_dev(memdev);
+		destroy_dev(kmemdev);
+		break;
+
+	case MOD_SHUTDOWN:
+		break;
+
+	default:
+		return(EOPNOTSUPP);
+		break;
+
+	}
+
+	return (0);
+}
+
+DEV_MODULE(mem, mem_modevent, NULL);