183 lines
4.7 KiB
C
183 lines
4.7 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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#include <machine/ofw_machdep.h>
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#include <machine/vmparam.h>
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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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#include <machine/memdev.h>
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struct mem_range_softc mem_range_softc;
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/* ARGSUSED */
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int
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memrw(struct cdev *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 va, eva, off, v;
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vm_prot_t prot;
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vm_size_t cnt;
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cnt = 0;
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error = 0;
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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("memrw");
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continue;
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}
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if (minor(dev) == CDEV_MINOR_MEM) {
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kmem_direct_mapped: v = uio->uio_offset;
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off = uio->uio_offset & PAGE_MASK;
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cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
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PAGE_MASK);
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cnt = min(cnt, PAGE_SIZE - off);
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cnt = min(cnt, iov->iov_len);
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if (mem_valid(v, cnt)
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&& pmap_dev_direct_mapped(v, cnt)) {
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error = EFAULT;
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break;
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}
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uiomove((void *)v, cnt, uio);
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break;
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}
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else if (minor(dev) == CDEV_MINOR_KMEM) {
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va = uio->uio_offset;
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if ((va < VM_MIN_KERNEL_ADDRESS)
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|| (va > VM_MAX_KERNEL_ADDRESS))
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goto kmem_direct_mapped;
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va = trunc_page(uio->uio_offset);
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eva = round_page(uio->uio_offset
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+ iov->iov_len);
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/*
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* Make sure that all the pages are currently resident
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* so that we don't create any zero-fill pages.
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*/
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for (; va < eva; va += PAGE_SIZE)
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if (pmap_extract(kernel_pmap, va)
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== 0)
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return (EFAULT);
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prot = (uio->uio_rw == UIO_READ)
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? VM_PROT_READ : VM_PROT_WRITE;
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va = uio->uio_offset;
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if (kernacc((void *) va, iov->iov_len, prot)
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== FALSE)
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return (EFAULT);
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error = uiomove((void *)va, iov->iov_len, uio);
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continue;
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}
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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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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) != CDEV_MINOR_MEM)
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return (-1);
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/* Only direct-mapped addresses. */
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if (mem_valid(offset, 0)
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&& pmap_dev_direct_mapped(offset, 0))
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return (EFAULT);
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*paddr = offset;
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return (0);
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}
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void
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dev_mem_md_init(void)
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{
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}
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