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/* $OpenBSD: criov.c,v 1.1 2001/05/13 15:39:26 deraadt Exp $ */
/*
* Copyright (c) 1999 Theo de Raadt
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <crypto/crypto.h>
int
iov2pages(crio, np, pp, lp, maxp, nicep)
struct criov *crio;
int *np;
long *pp;
int *lp;
int maxp;
int *nicep;
{
int npa = 0, tlen = 0;
int i;
for (i = 0; i < crio->niov; i++) {
vaddr_t va, off;
paddr_t pa;
int len;
if ((len = crio->iov[i].iov_len) == 0)
continue;
tlen += len;
va = (vaddr_t)crio->iov[i].iov_base;
off = va & PAGE_MASK;
va -= off;
next_page:
pa = pmap_extract(pmap_kernel(), va);
if (pa == 0)
panic("mbuf2pages: pa == 0");
pa += off;
lp[npa] = len;
pp[npa] = pa;
if (++npa > maxp)
return (0);
if (len + off > PAGE_SIZE) {
lp[npa - 1] = PAGE_SIZE - off;
va += PAGE_SIZE;
len -= PAGE_SIZE;
goto next_page;
}
}
if (nicep) {
int nice = 1;
int i;
/* see if each [pa,len] entry is long-word aligned */
for (i = 0; i < npa; i++)
if ((lp[i] & 3) || (pp[i] & 3))
nice = 0;
*nicep = nice;
}
*np = npa;
return (tlen);
}
void
criov_copydata(crio, off, len, cp)
struct criov *crio;
int off, len;
caddr_t cp;
{
struct iovec *iov = crio->iov;
int iol = crio->niov;
unsigned count;
if (off < 0)
panic("criov_copydata: off %d < 0", off);
if (len < 0)
panic("criov_copydata: len %d < 0", len);
while (off > 0) {
if (iol == 0)
panic("iov_copydata: empty in skip");
if (off < iov->iov_len)
break;
off -= iov->iov_len;
iol--;
iov++;
}
while (len > 0) {
if (iol == 0)
panic("criov_copydata: empty");
count = min(iov->iov_len - off, len);
bcopy(((caddr_t)iov->iov_base) + off, cp, count);
len -= count;
cp += count;
off = 0;
iol--;
iov++;
}
}
void
criov_copyback(crio, off, len, cp)
struct criov *crio;
int off, len;
caddr_t cp;
{
struct iovec *iov = crio->iov;
int iol = crio->niov;
unsigned count;
if (off < 0)
panic("criov_copyback: off %d < 0", off);
if (len < 0)
panic("criov_copyback: len %d < 0", len);
while (off > 0) {
if (iol == 0)
panic("criov_copyback: empty in skip");
if (off < iov->iov_len)
break;
off -= iov->iov_len;
iol--;
iov++;
}
while (len > 0) {
if (iol == 0)
panic("criov_copyback: empty");
count = min(iov->iov_len - off, len);
bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
len -= count;
cp += count;
off = 0;
iol--;
iov++;
}
}
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