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.

3 files changed, 61 insertions, 148 deletions

diff --git a/sys/alpha/alpha/mem.c b/sys/alpha/alpha/mem.c
index a64ea2a..fdc59ca 100644
--- a/sys/alpha/alpha/mem.c
+++ b/sys/alpha/alpha/mem.c
@@ -59,84 +59,18 @@ __FBSDID("$FreeBSD$");
 #include <sys/uio.h>
 
 #include <machine/md_var.h>
-#ifdef PERFMON
-#include <machine/perfmon.h>
-#endif
 
 #include <vm/vm.h>
 #include <vm/pmap.h>
 #include <vm/vm_extern.h>
 
-static struct cdev *memdev, *kmemdev;
-#ifdef PERFMON
-static struct cdev *perfdev;
-#endif /* PERFMON */
-
-static	d_open_t	mmopen;
-static	d_close_t	mmclose;
-static	d_read_t	mmrw;
-static	d_ioctl_t	mmioctl;
-static	d_mmap_t	memmmap;
-
-#define CDEV_MAJOR 2
-static struct cdevsw mem_cdevsw = {
-	.d_version =	D_VERSION,
-	.d_open =	mmopen,
-	.d_close =	mmclose,
-	.d_read =	mmrw,
-	.d_write =	mmrw,
-	.d_ioctl =	mmioctl,
-	.d_mmap =	memmmap,
-	.d_name =	"mem",
-	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_MEM | D_NEEDGIANT,
-};
+#include <machine/memdev.h>
 
 struct mem_range_softc mem_range_softc;
 
-static int
-mmclose(struct cdev *dev, int flags, int fmt, struct thread *td)
-{
-	switch (minor(dev)) {
-#ifdef PERFMON
-	case 32:
-		return perfmon_close(dev, flags, fmt, td);
-#endif
-	default:
-		break;
-	}
-	return (0);
-}
-
-static int
-mmopen(struct cdev *dev, int flags, int fmt, struct thread *td)
-{
-	int error;
-
-	switch (minor(dev)) {
-	case 0:
-	case 1:
-		if (flags & FWRITE) {
-			error = securelevel_gt(td->td_ucred, 0);
-			if (error)
-				return (error);
-		}
-		break;
-	case 32:
-#ifdef PERFMON
-		return perfmon_open(dev, flags, fmt, td);
-#else
-		return ENODEV;
-#endif
-	default:
-		break;
-	}
-	return (0);
-}
-
-/*ARGSUSED*/
-static int
-mmrw(struct cdev *dev, struct uio *uio, int flags)
+/* ARGSUSED */
+int
+memrw(struct cdev *dev, struct uio *uio, int flags)
 {
 	vm_offset_t o, v;
 	int c = 0;
@@ -152,13 +86,10 @@ mmrw(struct cdev *dev, struct uio *uio, int flags)
 			uio->uio_iov++;
 			uio->uio_iovcnt--;
 			if (uio->uio_iovcnt < 0)
-				panic("mmrw");
+				panic("memrw");
 			continue;
 		}
-		switch (minor(dev)) {
-
-/* minor device 0 is physical memory */
-		case 0:
+		if (minor(dev) == CDEV_MINOR_MEM) {
 			v = uio->uio_offset;
 kmemphys:
 			/* Allow reads only in RAM. */
@@ -174,9 +105,8 @@ kmemphys:
 			error =
 			    uiomove((caddr_t)ALPHA_PHYS_TO_K0SEG(v), c, uio);
 			continue;
-
-/* minor device 1 is kernel memory */
-		case 1:
+		}
+		else if (minor(dev) == CDEV_MINOR_KMEM) {
 			v = uio->uio_offset;
 
 			if (v >= ALPHA_K0SEG_BASE && v <= ALPHA_K0SEG_END) {
@@ -186,8 +116,9 @@ kmemphys:
 
 			c = min(iov->iov_len, MAXPHYS);
 			/*
-			 * Make sure that all of the pages are currently resident so
-			 * that we don't create any zero-fill pages.
+			 * Make sure that all of the pages are currently
+			 * resident so that we don't create any zero-fill
+			 * pages.
 			 */
 			addr = trunc_page(v);
 			eaddr = round_page(v + c);
@@ -203,22 +134,16 @@ kmemphys:
 			error = uiomove((caddr_t)v, c, uio);
 			continue;
 		}
-
-		if (error)
-			break;
-		iov->iov_base = (char *)iov->iov_base + c;
-		iov->iov_len -= c;
-		uio->uio_offset += c;
-		uio->uio_resid -= c;
+		/* else panic! */
 	}
 	return (error);
 }
 
-/*******************************************************\
-* allow user processes to MMAP some memory sections	*
-* instead of going through read/write			*
-\*******************************************************/
-static int
+/*
+ * allow user processes to MMAP some memory sections
+ * instead of going through read/write
+ */
+int
 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
 {
 	/*
@@ -227,7 +152,7 @@ memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
 	 * could be transient and hence incorrect or invalid at
 	 * a later time.
 	 */
-	if (minor(dev) != 0)
+	if (minor(dev) != CDEV_MINOR_MEM)
 		return (-1);
 
 	/*
@@ -239,59 +164,7 @@ memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
 	return (0);
 }
 
-static int
-mmioctl(struct cdev *dev, u_long cmd, caddr_t cmdarg, int flags, struct thread *td)
-{
-	switch(minor(dev)) {
-#ifdef PERFMON
-	case 32:
-		return perfmon_ioctl(dev, cmd, cmdarg, flags, td);
-#endif
-	default:
-		return ENODEV;
-	}
-
-	return (0);
-}
-
-static int
-mem_modevent(module_t mod, int type, void *data)
+void
+dev_mem_md_init(void)
 {
-	switch(type) {
-	case MOD_LOAD:
-		if (bootverbose)
-			printf("mem: <memory & I/O>\n");
-/* XXX - ??? */
-#if 0
-		/* Initialise memory range handling */
-		if (mem_range_softc.mr_op != NULL)
-			mem_range_softc.mr_op->init(&mem_range_softc);
-#endif
-
-		memdev = make_dev(&mem_cdevsw, 0, UID_ROOT, GID_KMEM,
-			0640, "mem");
-		kmemdev = make_dev(&mem_cdevsw, 1, UID_ROOT, GID_KMEM,
-			0640, "kmem");
-#ifdef PERFMON
-		perfdev = make_dev(&mem_cdevsw, 32, UID_ROOT, GID_KMEM,
-			0640, "perfmon");
-#endif /* PERFMON */
-		return 0;
-
-	case MOD_UNLOAD:
-		destroy_dev(memdev);
-		destroy_dev(kmemdev);
-#ifdef PERFMON
-		destroy_dev(perfdev);
-#endif /* PERFMON */
-		return 0;
-
-	case MOD_SHUTDOWN:
-		return 0;
-
-	default:
-		return EOPNOTSUPP;
-	}
 }
-
-DEV_MODULE(mem, mem_modevent, NULL);
diff --git a/sys/alpha/conf/GENERIC b/sys/alpha/conf/GENERIC
index b472cf5..08edc0f 100644
--- a/sys/alpha/conf/GENERIC
+++ b/sys/alpha/conf/GENERIC
@@ -171,8 +171,10 @@ device		wb		# Winbond W89C840F
 device		xl		# 3Com 3c90x (``Boomerang'', ``Cyclone'')
 
 # Pseudo devices.
-device		random		# Entropy device
 device		loop		# Network loopback
+device		mem		# Memory and kernel memory devices
+device		null		# Null and zero devices
+device		random		# Entropy device
 device		ether		# Ethernet support
 device		sl		# Kernel SLIP
 device		ppp		# Kernel PPP
diff --git a/sys/alpha/include/memdev.h b/sys/alpha/include/memdev.h
new file mode 100644
index 0000000..e2ec491
--- /dev/null
+++ b/sys/alpha/include/memdev.h
@@ -0,0 +1,38 @@
+/*-
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#define CDEV_MAJOR	2
+#define	CDEV_MINOR_MEM	0
+#define	CDEV_MINOR_KMEM	1
+
+d_open_t	memopen;
+d_read_t	memrw;
+#define		memioctl	(d_ioctl_t *)NULL;
+d_mmap_t	memmmap;
+
+void		dev_mem_md_init(void);