Add /dev/mem and /dev/kmem to powerpc.

Approved by:	grehan (mentor)

sys/conf/files.powerpc

@@ -91,6 +91,7 @@ libkern/ucmpdi2.c		standard
 libkern/udivdi3.c		standard
 libkern/umoddi3.c		standard
 
+powerpc/powerpc/mem.c		optional mem
 powerpc/powerpc/mp_machdep.c	optional smp
 
 powerpc/ofw/ofw_pci.c		optional	pci

sys/powerpc/aim/mmu_oea.c

@@ -2308,6 +2308,22 @@ pmap_bat_mapped(int idx, vm_offset_t pa, vm_size_t size)
 	return (0);
 }
 
+int
+pmap_dev_direct_mapped(vm_offset_t pa, vm_size_t size)
+{
+	int i;
+
+	/*
+	 * This currently does not work for entries that 
+	 * overlap 256M BAT segments.
+	 */
+
+	for(i = 0; i < 16; i++)
+		if (pmap_bat_mapped(i, pa, size) == 0)
+			return (0);
+
+	return (EFAULT);
+}
 
 /*
  * Map a set of physical memory pages into the kernel virtual

sys/powerpc/aim/ofw_machdep.c

@@ -242,3 +242,16 @@ OF_getetheraddr(device_t dev, u_char *addr)
 	node = ofw_pci_find_node(dev);
 	OF_getprop(node, "local-mac-address", addr, ETHER_ADDR_LEN);
 }
+
+int
+mem_valid(vm_offset_t addr, int len)
+{
+	int i;
+
+	for (i = 0; i < OFMEM_REGIONS; i++)
+		if ((addr >= OFmem[i].mr_start) 
+		    && (addr + len < OFmem[i].mr_start + OFmem[i].mr_size))
+			return (0);
+
+	return (EFAULT);
+}

sys/powerpc/conf/GENERIC

@@ -103,6 +103,7 @@ device 		fxp		# Intel EtherExpress PRO/100B (82557, 82558)
 
 # Pseudo devices.
 device		loop		# Network loopback
+device		mem		# Memory and kernel memory devices
 device		random		# Entropy device
 device		ether		# Ethernet support
 device		sl		# Kernel SLIP

sys/powerpc/include/memdev.h

@@ -0,0 +1,40 @@
+/*-
+ * 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);
+
+MALLOC_DECLARE(M_MEMDEV);

sys/powerpc/include/ofw_machdep.h

@@ -31,5 +31,6 @@
 #include <sys/bus.h>
 
 void OF_getetheraddr(device_t dev, u_char *addr);
+int mem_valid(vm_offset_t addr, int len);
 
 #endif /* _MACHINE_OFW_MACHDEP_H_ */

sys/powerpc/include/pmap.h

@@ -82,6 +82,8 @@ vm_offset_t	pmap_kextract(vm_offset_t);
 
 int		pmap_pte_spill(vm_offset_t);
 
+int		pmap_dev_direct_mapped(vm_offset_t, vm_size_t);
+
 #define	vtophys(va)	pmap_kextract(((vm_offset_t)(va)))
 
 extern	vm_offset_t phys_avail[];

sys/powerpc/powerpc/mem.c

@@ -0,0 +1,182 @@
+/*-
+ * Copyright (c) 1988 University of Utah.
+ * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * the Systems Programming Group of the University of Utah Computer
+ * Science Department, and code derived from software contributed to
+ * Berkeley by William Jolitz.
+ *
+ * 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.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ *
+ *	from: Utah $Hdr: mem.c 1.13 89/10/08$
+ *	from: @(#)mem.c	7.2 (Berkeley) 5/9/91
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Memory special file
+ */
+
+#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/msgbuf.h>
+#include <sys/systm.h>
+#include <sys/signalvar.h>
+#include <sys/uio.h>
+
+#include <machine/md_var.h>
+#include <machine/ofw_machdep.h>
+#include <machine/vmparam.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+#include <vm/vm_extern.h>
+
+#include <machine/memdev.h>
+
+struct mem_range_softc mem_range_softc;
+
+/* ARGSUSED */
+int
+memrw(struct cdev *dev, struct uio *uio, int flags)
+{
+	struct iovec *iov;
+	int error = 0;
+	vm_offset_t va, eva, off, v;
+	vm_prot_t prot;
+	vm_size_t cnt;
+
+	cnt = 0;
+	error = 0;
+
+	GIANT_REQUIRED;
+
+	while (uio->uio_resid > 0 && !error) {
+		iov = uio->uio_iov;
+		if (iov->iov_len == 0) {
+			uio->uio_iov++;
+			uio->uio_iovcnt--;
+			if (uio->uio_iovcnt < 0)
+				panic("memrw");
+			continue;
+		}
+		if (minor(dev) == CDEV_MINOR_MEM) {
+kmem_direct_mapped:	v = uio->uio_offset;
+
+			off = uio->uio_offset & PAGE_MASK;
+			cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
+			    PAGE_MASK);
+			cnt = min(cnt, PAGE_SIZE - off);
+			cnt = min(cnt, iov->iov_len);
+
+			if (mem_valid(v, cnt)
+			    && pmap_dev_direct_mapped(v, cnt)) {
+				error = EFAULT;
+				break;
+			}
+
+			uiomove((void *)v, cnt, uio);
+			break;
+		}
+		else if (minor(dev) == CDEV_MINOR_KMEM) {
+			va = uio->uio_offset;
+
+			if ((va < VM_MIN_KERNEL_ADDRESS)
+			    || (va > VM_MAX_KERNEL_ADDRESS))
+				goto kmem_direct_mapped;
+
+			va = trunc_page(uio->uio_offset);
+			eva = round_page(uio->uio_offset
+			    + iov->iov_len);
+
+			/* 
+			 * Make sure that all the pages are currently resident
+			 * so that we don't create any zero-fill pages.
+			 */
+
+			for (; va < eva; va += PAGE_SIZE)
+				if (pmap_extract(kernel_pmap, va)
+				    == 0)
+					return (EFAULT);
+
+			prot = (uio->uio_rw == UIO_READ)
+			    ? VM_PROT_READ : VM_PROT_WRITE;
+
+			va = uio->uio_offset;
+			if (kernacc((void *) va, iov->iov_len, prot)
+			    == FALSE)
+				return (EFAULT);
+
+			error = uiomove((void *)va, iov->iov_len, uio);
+
+			continue;
+		}
+	}
+
+	return (error);
+}
+
+/*
+ * 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)
+{
+	/*
+	 * /dev/mem is the only one that makes sense through this
+	 * interface.  For /dev/kmem any physaddr we return here
+	 * could be transient and hence incorrect or invalid at
+	 * a later time.
+	 */
+	if (minor(dev) != CDEV_MINOR_MEM)
+		return (-1);
+
+	/* Only direct-mapped addresses. */
+	if (mem_valid(offset, 0)
+	    && pmap_dev_direct_mapped(offset, 0))
+		return (EFAULT);
+
+	*paddr = offset;
+
+	return (0);
+}
+
+void
+dev_mem_md_init(void)
+{
+}

sys/powerpc/powerpc/mmu_oea.c

@@ -2308,6 +2308,22 @@ pmap_bat_mapped(int idx, vm_offset_t pa, vm_size_t size)
 	return (0);
 }
 
+int
+pmap_dev_direct_mapped(vm_offset_t pa, vm_size_t size)
+{
+	int i;
+
+	/*
+	 * This currently does not work for entries that 
+	 * overlap 256M BAT segments.
+	 */
+
+	for(i = 0; i < 16; i++)
+		if (pmap_bat_mapped(i, pa, size) == 0)
+			return (0);
+
+	return (EFAULT);
+}
 
 /*
  * Map a set of physical memory pages into the kernel virtual

sys/powerpc/powerpc/ofw_machdep.c

@@ -242,3 +242,16 @@ OF_getetheraddr(device_t dev, u_char *addr)
 	node = ofw_pci_find_node(dev);
 	OF_getprop(node, "local-mac-address", addr, ETHER_ADDR_LEN);
 }
+
+int
+mem_valid(vm_offset_t addr, int len)
+{
+	int i;
+
+	for (i = 0; i < OFMEM_REGIONS; i++)
+		if ((addr >= OFmem[i].mr_start) 
+		    && (addr + len < OFmem[i].mr_start + OFmem[i].mr_size))
+			return (0);
+
+	return (EFAULT);
+}

sys/powerpc/powerpc/pmap.c

@@ -2308,6 +2308,22 @@ pmap_bat_mapped(int idx, vm_offset_t pa, vm_size_t size)
 	return (0);
 }
 
+int
+pmap_dev_direct_mapped(vm_offset_t pa, vm_size_t size)
+{
+	int i;
+
+	/*
+	 * This currently does not work for entries that 
+	 * overlap 256M BAT segments.
+	 */
+
+	for(i = 0; i < 16; i++)
+		if (pmap_bat_mapped(i, pa, size) == 0)
+			return (0);
+
+	return (EFAULT);
+}
 
 /*
  * Map a set of physical memory pages into the kernel virtual