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298 lines
7.0 KiB
C
298 lines
7.0 KiB
C
/*-
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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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* 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Memory special file
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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/malloc.h>
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#include <sys/memrange.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/msgbuf.h>
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#include <sys/systm.h>
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#include <sys/signalvar.h>
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#include <sys/uio.h>
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#include <machine/md_var.h>
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#ifdef PERFMON
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#include <machine/perfmon.h>
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#endif
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_extern.h>
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static struct cdev *memdev, *kmemdev;
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#ifdef PERFMON
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static struct cdev *perfdev;
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#endif /* PERFMON */
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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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static d_ioctl_t mmioctl;
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static d_mmap_t memmmap;
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#define CDEV_MAJOR 2
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static struct cdevsw mem_cdevsw = {
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.d_version = D_VERSION,
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.d_open = mmopen,
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.d_close = mmclose,
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.d_read = mmrw,
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.d_write = mmrw,
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.d_ioctl = mmioctl,
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.d_mmap = memmmap,
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.d_name = "mem",
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.d_maj = CDEV_MAJOR,
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.d_flags = D_MEM | D_NEEDGIANT,
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};
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struct mem_range_softc mem_range_softc;
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static int
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mmclose(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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switch (minor(dev)) {
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#ifdef PERFMON
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case 32:
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return perfmon_close(dev, flags, fmt, td);
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#endif
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default:
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break;
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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(struct cdev *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_ucred, 0);
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if (error)
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return (error);
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}
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break;
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case 32:
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#ifdef PERFMON
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return perfmon_open(dev, flags, fmt, td);
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#else
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return ENODEV;
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#endif
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default:
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break;
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}
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return (0);
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}
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/*ARGSUSED*/
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static int
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mmrw(struct cdev *dev, struct uio *uio, int flags)
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{
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vm_offset_t o, v;
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int c = 0;
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struct iovec *iov;
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int error = 0, rw;
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vm_offset_t addr, eaddr;
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GIANT_REQUIRED;
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while (uio->uio_resid > 0 && !error) {
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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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/* minor device 0 is physical memory */
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case 0:
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v = uio->uio_offset;
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kmemphys:
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/* Allow reads only in RAM. */
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rw = (uio->uio_rw == UIO_READ) ? VM_PROT_READ : VM_PROT_WRITE;
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if ((alpha_pa_access(v) & rw) != rw) {
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error = EFAULT;
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c = 0;
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break;
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}
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o = uio->uio_offset & PAGE_MASK;
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c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
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error =
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uiomove((caddr_t)ALPHA_PHYS_TO_K0SEG(v), c, uio);
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continue;
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/* minor device 1 is kernel memory */
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case 1:
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v = uio->uio_offset;
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if (v >= ALPHA_K0SEG_BASE && v <= ALPHA_K0SEG_END) {
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v = ALPHA_K0SEG_TO_PHYS(v);
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goto kmemphys;
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}
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c = min(iov->iov_len, MAXPHYS);
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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(v);
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eaddr = round_page(v + 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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}
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if (!kernacc((caddr_t)v, 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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error = uiomove((caddr_t)v, c, uio);
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continue;
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}
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if (error)
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break;
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iov->iov_base = (char *)iov->iov_base + c;
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iov->iov_len -= c;
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uio->uio_offset += c;
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uio->uio_resid -= c;
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}
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return (error);
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}
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/*******************************************************\
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* allow user processes to MMAP some memory sections *
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* instead of going through read/write *
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\*******************************************************/
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static int
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memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
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{
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/*
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* /dev/mem is the only one that makes sense through this
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* interface. For /dev/kmem any physaddr we return here
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* could be transient and hence incorrect or invalid at
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* a later time.
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*/
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if (minor(dev) != 0)
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return (-1);
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/*
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* Allow access only in RAM.
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*/
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if ((prot & alpha_pa_access(atop((vm_offset_t)offset))) != prot)
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return (-1);
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*paddr = ALPHA_PHYS_TO_K0SEG(offset);
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return (0);
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}
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static int
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mmioctl(struct cdev *dev, u_long cmd, caddr_t cmdarg, int flags, struct thread *td)
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{
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switch(minor(dev)) {
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#ifdef PERFMON
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case 32:
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return perfmon_ioctl(dev, cmd, cmdarg, flags, td);
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#endif
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default:
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return ENODEV;
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}
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return (0);
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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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/* XXX - ??? */
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#if 0
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/* Initialise memory range handling */
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if (mem_range_softc.mr_op != NULL)
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mem_range_softc.mr_op->init(&mem_range_softc);
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#endif
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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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#ifdef PERFMON
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perfdev = make_dev(&mem_cdevsw, 32, UID_ROOT, GID_KMEM,
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0640, "perfmon");
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#endif /* PERFMON */
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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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#ifdef PERFMON
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destroy_dev(perfdev);
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#endif /* PERFMON */
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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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