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/******************************************************************************
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see <http://www.gnu.org/licenses/>.
*
* Split from xc_freebsd_osdep.c
*/
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include "private.h"
#define PRIVCMD_DEV "/dev/xen/privcmd"
int osdep_xencall_open(xencall_handle *xcall)
{
int fd = open(PRIVCMD_DEV, O_RDWR|O_CLOEXEC);
/*
* This file descriptor is opaque to the caller, thus we are
* polite and try and ensure it doesn't propagate (ie leak)
* outside the process, by using O_CLOEXEC.
*/
if ( fd == -1 )
{
PERROR("Could not obtain handle on privileged command interface "
PRIVCMD_DEV);
return -1;
}
xcall->fd = fd;
return 0;
}
int osdep_xencall_close(xencall_handle *xcall)
{
int fd = xcall->fd;
if ( fd == -1 )
return 0;
return close(fd);
}
long osdep_hypercall(xencall_handle *xcall, privcmd_hypercall_t *hypercall)
{
int fd = xcall->fd;
int ret;
ret = ioctl(fd, IOCTL_PRIVCMD_HYPERCALL, hypercall);
return (ret == 0) ? hypercall->retval : ret;
}
void *osdep_alloc_pages(xencall_handle *xcall, size_t npages)
{
size_t size = npages * PAGE_SIZE;
void *p;
/* Address returned by mmap is page aligned. */
p = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0);
if (p == NULL)
return NULL;
/*
* Since FreeBSD doesn't have the MAP_LOCKED flag,
* lock memory using mlock.
*/
if ( mlock(p, size) < 0 )
{
munmap(p, size);
return NULL;
}
return p;
}
void osdep_free_pages(xencall_handle *xcall, void *ptr, size_t npages)
{
int saved_errno = errno;
/* Unlock pages */
munlock(ptr, npages * PAGE_SIZE);
munmap(ptr, npages * PAGE_SIZE);
/* We MUST propagate the hypercall errno, not unmap call's. */
errno = saved_errno;
}
int xencall_buffers_never_fault(xencall_handle *xcall)
{
return 1;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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