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kaf24@firebug.cl.cam.ac.uk
96428d33d9
to user space thru /dev/xen/evtchn. Signed-off-by: Keir Fraser <keir@xensource.com>
68 lines
1.6 KiB
C
68 lines
1.6 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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* 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(int xc_handle, evtchn_op_t *op)
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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] = (unsigned long)op;
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if ( mlock(op, sizeof(*op)) != 0 )
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{
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PERROR("do_evtchn_op: op mlock failed");
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goto out;
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}
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if ((ret = do_xen_hypercall(xc_handle, &hypercall)) < 0)
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ERROR("do_evtchn_op: HYPERVISOR_event_channel_op failed: %d", ret);
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safe_munlock(op, sizeof(*op));
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out:
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return ret;
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}
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int xc_evtchn_alloc_unbound(int xc_handle,
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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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evtchn_op_t op = {
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.cmd = EVTCHNOP_alloc_unbound,
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.u.alloc_unbound.dom = (domid_t)dom,
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.u.alloc_unbound.remote_dom = (domid_t)remote_dom };
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if ( (rc = do_evtchn_op(xc_handle, &op)) == 0 )
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rc = op.u.alloc_unbound.port;
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return rc;
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}
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int xc_evtchn_status(int xc_handle,
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uint32_t dom,
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evtchn_port_t port,
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xc_evtchn_status_t *status)
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{
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int rc;
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evtchn_op_t op = {
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.cmd = EVTCHNOP_status,
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.u.status.dom = (domid_t)dom,
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.u.status.port = port };
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if ( (rc = do_evtchn_op(xc_handle, &op)) == 0 )
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memcpy(status, &op.u.status, sizeof(*status));
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return rc;
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}
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