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https://github.com/xen-project/xen.git
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Ian Campbell
2d2f789577
This is used only for xc_evtchn_alloc_unbound and the legacy/compat versions of the old interfaces and avoids redefining the typedef. The evtchn_port_or_error_t name is now used only be libxenevtchn. None of the callers of xc_evtchn_alloc_unbound use the type themselves. NB xc_evtchn_alloc_unbound differs from xc_evtchn_bind_unbound_port and the underlying xenevtchn_bind_unbound_port in that it allows the specification of the local domain rather than assuming self. This is only useful during domain build. Reported-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
86 lines
2.4 KiB
C
86 lines
2.4 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, see <http://www.gnu.org/licenses/>.
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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_BOUNCE(arg, arg_size, XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
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if ( xc_hypercall_bounce_pre(xch, arg) )
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{
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PERROR("do_evtchn_op: bouncing arg failed");
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goto out;
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}
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ret = xencall2(xch->xcall, __HYPERVISOR_event_channel_op,
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cmd, HYPERCALL_BUFFER_AS_ARG(arg));
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if ( ret < 0 && !silently_fail )
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ERROR("do_evtchn_op: HYPERVISOR_event_channel_op failed: %d", ret);
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xc_hypercall_bounce_post(xch, arg);
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out:
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return ret;
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}
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xc_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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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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