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Ian Campbell
f114466a23
Not actually used here but useful to confirm that a handle is passed down to each location where it will be required once we switch to hypercall buffers. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/******************************************************************************
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* xc_evtchn.c
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*
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* API for manipulating and accessing inter-domain event channels.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Copyright (c) 2004, K A Fraser.
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*/
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#include "xc_private.h"
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static int do_evtchn_op(xc_interface *xch, int cmd, void *arg,
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size_t arg_size, int silently_fail)
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{
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int ret = -1;
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DECLARE_HYPERCALL;
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hypercall.op = __HYPERVISOR_event_channel_op;
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hypercall.arg[0] = cmd;
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hypercall.arg[1] = (unsigned long)arg;
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if ( lock_pages(xch, arg, arg_size) != 0 )
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{
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PERROR("do_evtchn_op: arg lock failed");
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goto out;
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}
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if ((ret = do_xen_hypercall(xch, &hypercall)) < 0 && !silently_fail)
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ERROR("do_evtchn_op: HYPERVISOR_event_channel_op failed: %d", ret);
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unlock_pages(xch, arg, arg_size);
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out:
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return ret;
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}
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evtchn_port_or_error_t
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xc_evtchn_alloc_unbound(xc_interface *xch,
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uint32_t dom,
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uint32_t remote_dom)
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{
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int rc;
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struct evtchn_alloc_unbound arg = {
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.dom = (domid_t)dom,
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.remote_dom = (domid_t)remote_dom
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};
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rc = do_evtchn_op(xch, EVTCHNOP_alloc_unbound, &arg, sizeof(arg), 0);
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if ( rc == 0 )
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rc = arg.port;
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return rc;
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}
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int xc_evtchn_reset(xc_interface *xch,
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uint32_t dom)
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{
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struct evtchn_reset arg = { .dom = (domid_t)dom };
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return do_evtchn_op(xch, EVTCHNOP_reset, &arg, sizeof(arg), 0);
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}
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int xc_evtchn_status(xc_interface *xch, xc_evtchn_status_t *status)
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{
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return do_evtchn_op(xch, EVTCHNOP_status, status,
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sizeof(*status), 1);
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}
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