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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_netbsd.c
*/
#include <unistd.h>
#include <fcntl.h>
#include <malloc.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include "private.h"
int osdep_xencall_open(xencall_handle *xcall)
{
int flags, saved_errno;
int fd = open("/kern/xen/privcmd", O_RDWR);
if ( fd == -1 )
{
PERROR("Could not obtain handle on privileged command interface");
return -1;
}
/* Although we return the file handle as the 'xc handle' the API
does not specify / guarentee that this integer is in fact
a file handle. Thus we must take responsiblity to ensure
it doesn't propagate (ie leak) outside the process */
if ( (flags = fcntl(fd, F_GETFD)) < 0 )
{
PERROR("Could not get file handle flags");
goto error;
}
flags |= FD_CLOEXEC;
if ( fcntl(fd, F_SETFD, flags) < 0 )
{
PERROR("Could not set file handle flags");
goto error;
}
xcall->fd = fd;
return 0;
error:
saved_errno = errno;
close(fd);
errno = saved_errno;
return -1;
}
int osdep_xencall_close(xencall_handle *xcall)
{
int fd = xcall->fd;
return close(fd);
}
void *osdep_alloc_pages(xencall_handle *xcall, size_t npages)
{
size_t size = npages * PAGE_SIZE;
void *p;
int ret;
ret = posix_memalign(&p, PAGE_SIZE, size);
if ( ret != 0 || !p )
return NULL;
if ( mlock(p, size) < 0 )
{
free(p);
return NULL;
}
return p;
}
void osdep_free_pages(xencall_handle *xcall, void *ptr, size_t npages)
{
munlock(ptr, npages * PAGE_SIZE);
free(ptr);
}
long osdep_hypercall(xencall_handle *xcall, privcmd_hypercall_t *hypercall)
{
int fd = xcall->fd;
int error = ioctl(fd, IOCTL_PRIVCMD_HYPERCALL, hypercall);
/*
* Since NetBSD ioctl can only return 0 on success or < 0 on
* error, if we want to return a value from ioctl we should
* do so by setting hypercall->retval, to mimic Linux ioctl
* implementation.
*/
if (error < 0)
return error;
else
return hypercall->retval;
}
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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