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/*-
* Copyright (c) 2014 Andrew Turner
* 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.
* 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 AUTHOR 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 AUTHOR 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.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/malloc.h>
#include <sys/memrange.h>
#include <sys/uio.h>
#include <machine/memdev.h>
#include <machine/vmparam.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <vm/vm_page.h>
struct mem_range_softc mem_range_softc;
int
memrw(struct cdev *dev, struct uio *uio, int flags)
{
ssize_t orig_resid;
vm_offset_t off, v;
struct iovec *iov;
struct vm_page m;
vm_page_t marr;
u_int cnt;
int error;
error = 0;
orig_resid = uio->uio_resid;
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("memrw");
continue;
}
v = uio->uio_offset;
off = v & PAGE_MASK;
cnt = ulmin(iov->iov_len, PAGE_SIZE - (u_int)off);
if (cnt == 0)
continue;
switch(dev2unit(dev)) {
case CDEV_MINOR_KMEM:
/* If the address is in the DMAP just copy it */
if (VIRT_IN_DMAP(v)) {
error = uiomove((void *)v, cnt, uio);
break;
}
if (!kernacc((void *)v, cnt, uio->uio_rw == UIO_READ ?
VM_PROT_READ : VM_PROT_WRITE)) {
error = EFAULT;
break;
}
/* Get the physical address to read */
v = pmap_extract(kernel_pmap, v);
if (v == 0) {
error = EFAULT;
break;
}
/* FALLTHROUGH */
case CDEV_MINOR_MEM:
/* If within the DMAP use this to copy from */
if (PHYS_IN_DMAP(v)) {
v = PHYS_TO_DMAP(v);
error = uiomove((void *)v, cnt, uio);
break;
}
/* Have uiomove_fromphys handle the data */
m.phys_addr = trunc_page(v);
marr = &m;
uiomove_fromphys(&marr, off, cnt, uio);
break;
}
}
/*
* Don't return error if any byte was written. Read and write
* can return error only if no i/o was performed.
*/
if (uio->uio_resid != orig_resid)
error = 0;
return (error);
}
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