Add a driver for the mem and kmem devices, based off the i386 version.

1 files changed, 244 insertions, 0 deletions

diff --git a/sys/sparc64/sparc64/mem.c b/sys/sparc64/sparc64/mem.c
new file mode 100644
index 0000000..b68c384
--- /dev/null
+++ b/sys/sparc64/sparc64/mem.c
@@ -0,0 +1,244 @@
+/*-
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 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
+ *	from: FreeBSD: src/sys/i386/i386/mem.c,v 1.94 2001/09/26
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Memory special file
+ *
+ * NOTE: other architectures support mmap()'ing the mem and kmem devices; this
+ * might cause illegal aliases to be created for the locked kernel page(s), so
+ * it is not implemented.
+ */
+
+#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/fcntl.h>
+#include <sys/kernel.h>
+#include <sys/lock.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/vm_param.h>
+#include <vm/pmap.h>
+#include <vm/vm_extern.h>
+
+#include <machine/cache.h>
+#include <machine/pmap.h>
+#include <machine/upa.h>
+
+static dev_t memdev, kmemdev;
+
+static	d_open_t	mmopen;
+static	d_close_t	mmclose;
+static	d_read_t	mmrw;
+
+#define CDEV_MAJOR 2
+static struct cdevsw mem_cdevsw = {
+	/* open */	mmopen,
+	/* close */	mmclose,
+	/* read */	mmrw,
+	/* write */	mmrw,
+	/* ioctl */	noioctl,
+	/* poll */	(d_poll_t *)seltrue,
+	/* mmap */	nommap,
+	/* strategy */	nostrategy,
+	/* name */	"mem",
+	/* maj */	CDEV_MAJOR,
+	/* dump */	nodump,
+	/* psize */	nopsize,
+	/* flags */	D_MEM,
+};
+
+static int
+mmclose(dev_t dev, int flags, int fmt, struct thread *td)
+{
+
+	return (0);
+}
+
+static int
+mmopen(dev_t 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_proc->p_ucred, 0);
+			if (error != 0)
+				return (error);
+		}
+		break;
+	default:
+		return (ENXIO);
+	}
+	return (0);
+}
+
+#define	IOSTART		UPA_MEMSTART
+
+/*ARGSUSED*/
+static int
+mmrw(dev_t dev, struct uio *uio, int flags)
+{
+	struct iovec *iov;
+	int error = 0;
+	vm_offset_t addr, eaddr, o, v = 0;
+	vm_size_t c = 0;
+	u_long asi;
+	char *buf = NULL;
+
+	GIANT_REQUIRED;
+
+	while (uio->uio_resid > 0 && error == 0) {
+		iov = uio->uio_iov;
+		if (iov->iov_len == 0) {
+			uio->uio_iov++;
+			uio->uio_iovcnt--;
+			if (uio->uio_iovcnt < 0)
+				panic("mmrw");
+			continue;
+		}
+		switch (minor(dev)) {
+		case 0:
+			/* mem (physical memory) */
+			if (buf == NULL) {
+				buf = malloc(PAGE_SIZE, M_DEVBUF, M_WAITOK);
+				if (buf == NULL) {
+					error = ENOMEM;
+					break;
+				}
+			}
+			v = uio->uio_offset;
+			asi = ASI_PHYS_USE_EC;
+			/* Access device memory noncacheable. */
+			if (v >= IOSTART)
+				asi = ASI_PHYS_BYPASS_EC_WITH_EBIT;
+			o = v & PAGE_MASK;
+			c = ulmin(iov->iov_len, PAGE_SIZE - o);
+			/*
+			 * This double copy could be avoided, at the cost of
+			 * inlining a version of uiomove. Since this is not
+			 * performance-critical, it is probably not worth it.
+			 */
+			if (uio->uio_rw == UIO_READ)
+				ascopyfrom(asi, v, buf, c);
+			error = uiomove(buf, c, uio);
+			if (error == 0 && uio->uio_rw == UIO_WRITE)
+				ascopyto(buf, asi, v, c);
+			/*
+			 * If a write was evil enough to change kernel code,
+			 * I$ must be flushed. Also, D$ must be flushed if there
+			 * is a chance that there is a cacheable mapping to
+			 * avoid working with stale data.
+			 */
+			if (v < IOSTART && uio->uio_rw == UIO_WRITE) {
+				icache_inval_phys(v, v + c);
+				dcache_inval_phys(v, v + c);
+			}
+			break;
+		case 1:
+			/* kmem (kernel memory) */
+			c = iov->iov_len;
+
+			/*
+			 * Make sure that all of the pages are currently resident so
+			 * that we don't create any zero-fill pages.
+			 */
+			addr = trunc_page(uio->uio_offset);
+			eaddr = round_page(uio->uio_offset + c);
+
+			for (; addr < eaddr; addr += PAGE_SIZE)
+				if (pmap_extract(kernel_pmap, addr) == 0)
+					return EFAULT;
+
+			if (!kernacc((caddr_t)uio->uio_offset, c,
+			    uio->uio_rw == UIO_READ ?
+			    VM_PROT_READ : VM_PROT_WRITE)) {
+				return (EFAULT);
+			}
+			v = uio->uio_offset;
+			error = uiomove((caddr_t)v, c, uio);
+			if (uio->uio_rw == UIO_WRITE)
+				icache_flush(v, v + c);
+		}
+	}
+	if (buf != NULL)
+		free(buf, M_DEVBUF);
+	return (error);
+}
+
+static int
+mem_modevent(module_t mod, int type, void *data)
+{
+	switch(type) {
+	case MOD_LOAD:
+		if (bootverbose)
+			printf("mem: <memory & I/O>\n");
+
+		memdev = make_dev(&mem_cdevsw, 0, UID_ROOT, GID_KMEM,
+			0640, "mem");
+		kmemdev = make_dev(&mem_cdevsw, 1, UID_ROOT, GID_KMEM,
+			0640, "kmem");
+		return 0;
+
+	case MOD_UNLOAD:
+		destroy_dev(memdev);
+		destroy_dev(kmemdev);
+		return 0;
+
+	case MOD_SHUTDOWN:
+		return 0;
+
+	default:
+		return EOPNOTSUPP;
+	}
+}
+
+DEV_MODULE(mem, mem_modevent, NULL);