Add a driver for the mem and kmem devices, based off the i386 version.
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Thomas Moestl
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8ad749a45d
commit
0c530eb321
@ -43,6 +43,7 @@ sparc64/sparc64/in_cksum.c optional inet
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sparc64/sparc64/intr_machdep.c standard
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sparc64/sparc64/iommu.c standard
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sparc64/sparc64/machdep.c standard
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sparc64/sparc64/mem.c standard
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sparc64/sparc64/mp_exception.s optional smp
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sparc64/sparc64/mp_locore.s optional smp
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sparc64/sparc64/mp_machdep.c optional smp
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244
sys/sparc64/sparc64/mem.c
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244
sys/sparc64/sparc64/mem.c
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@ -0,0 +1,244 @@
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/*-
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department, and code derived from software contributed to
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* Berkeley by William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: mem.c 1.13 89/10/08$
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* from: @(#)mem.c 7.2 (Berkeley) 5/9/91
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* from: FreeBSD: src/sys/i386/i386/mem.c,v 1.94 2001/09/26
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*
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* $FreeBSD$
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*/
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/*
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* Memory special file
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*
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* NOTE: other architectures support mmap()'ing the mem and kmem devices; this
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* might cause illegal aliases to be created for the locked kernel page(s), so
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* it is not implemented.
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*/
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_extern.h>
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#include <machine/cache.h>
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#include <machine/pmap.h>
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#include <machine/upa.h>
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static dev_t memdev, kmemdev;
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static d_open_t mmopen;
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static d_close_t mmclose;
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static d_read_t mmrw;
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#define CDEV_MAJOR 2
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static struct cdevsw mem_cdevsw = {
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/* open */ mmopen,
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/* close */ mmclose,
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/* read */ mmrw,
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/* write */ mmrw,
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/* ioctl */ noioctl,
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/* poll */ (d_poll_t *)seltrue,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "mem",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ D_MEM,
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};
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static int
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mmclose(dev_t dev, int flags, int fmt, struct thread *td)
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{
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return (0);
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}
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static int
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mmopen(dev_t dev, int flags, int fmt, struct thread *td)
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{
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int error;
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switch (minor(dev)) {
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case 0:
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case 1:
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if (flags & FWRITE) {
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error = securelevel_gt(td->td_proc->p_ucred, 0);
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if (error != 0)
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return (error);
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}
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break;
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default:
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return (ENXIO);
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}
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return (0);
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}
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#define IOSTART UPA_MEMSTART
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/*ARGSUSED*/
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static int
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mmrw(dev_t dev, struct uio *uio, int flags)
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{
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struct iovec *iov;
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int error = 0;
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vm_offset_t addr, eaddr, o, v = 0;
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vm_size_t c = 0;
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u_long asi;
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char *buf = NULL;
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GIANT_REQUIRED;
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while (uio->uio_resid > 0 && error == 0) {
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iov = uio->uio_iov;
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if (iov->iov_len == 0) {
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uio->uio_iov++;
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uio->uio_iovcnt--;
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if (uio->uio_iovcnt < 0)
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panic("mmrw");
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continue;
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}
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switch (minor(dev)) {
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case 0:
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/* mem (physical memory) */
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if (buf == NULL) {
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buf = malloc(PAGE_SIZE, M_DEVBUF, M_WAITOK);
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if (buf == NULL) {
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error = ENOMEM;
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break;
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}
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}
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v = uio->uio_offset;
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asi = ASI_PHYS_USE_EC;
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/* Access device memory noncacheable. */
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if (v >= IOSTART)
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asi = ASI_PHYS_BYPASS_EC_WITH_EBIT;
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o = v & PAGE_MASK;
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c = ulmin(iov->iov_len, PAGE_SIZE - o);
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/*
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* This double copy could be avoided, at the cost of
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* inlining a version of uiomove. Since this is not
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* performance-critical, it is probably not worth it.
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*/
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if (uio->uio_rw == UIO_READ)
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ascopyfrom(asi, v, buf, c);
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error = uiomove(buf, c, uio);
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if (error == 0 && uio->uio_rw == UIO_WRITE)
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ascopyto(buf, asi, v, c);
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/*
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* If a write was evil enough to change kernel code,
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* I$ must be flushed. Also, D$ must be flushed if there
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* is a chance that there is a cacheable mapping to
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* avoid working with stale data.
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*/
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if (v < IOSTART && uio->uio_rw == UIO_WRITE) {
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icache_inval_phys(v, v + c);
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dcache_inval_phys(v, v + c);
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}
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break;
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case 1:
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/* kmem (kernel memory) */
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c = iov->iov_len;
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/*
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* Make sure that all of the pages are currently resident so
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* that we don't create any zero-fill pages.
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*/
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addr = trunc_page(uio->uio_offset);
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eaddr = round_page(uio->uio_offset + c);
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for (; addr < eaddr; addr += PAGE_SIZE)
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if (pmap_extract(kernel_pmap, addr) == 0)
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return EFAULT;
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if (!kernacc((caddr_t)uio->uio_offset, c,
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uio->uio_rw == UIO_READ ?
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VM_PROT_READ : VM_PROT_WRITE)) {
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return (EFAULT);
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}
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v = uio->uio_offset;
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error = uiomove((caddr_t)v, c, uio);
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if (uio->uio_rw == UIO_WRITE)
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icache_flush(v, v + c);
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}
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}
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if (buf != NULL)
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free(buf, M_DEVBUF);
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return (error);
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}
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static int
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mem_modevent(module_t mod, int type, void *data)
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{
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switch(type) {
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case MOD_LOAD:
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if (bootverbose)
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printf("mem: <memory & I/O>\n");
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memdev = make_dev(&mem_cdevsw, 0, UID_ROOT, GID_KMEM,
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0640, "mem");
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kmemdev = make_dev(&mem_cdevsw, 1, UID_ROOT, GID_KMEM,
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0640, "kmem");
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return 0;
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case MOD_UNLOAD:
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destroy_dev(memdev);
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destroy_dev(kmemdev);
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return 0;
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case MOD_SHUTDOWN:
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return 0;
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default:
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return EOPNOTSUPP;
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}
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}
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DEV_MODULE(mem, mem_modevent, NULL);
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