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4c9e6ad320
Alas, ARM declared xen_ulong_t to be 64-bits long, unlike i386 where it matches the word size. As a result, compatibility wrappers are needed for Xen atomic operations. Reviewed by: royger
99 lines
3 KiB
C
99 lines
3 KiB
C
/******************************************************************************
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* evtchn.h
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*
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* Data structures and definitions private to the FreeBSD implementation
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* of the Xen event channel API.
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*
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* Copyright (c) 2004, K A Fraser
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* Copyright (c) 2012, Spectra Logic Corporation
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* Copyright © 2022, Elliott Mitchell
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*
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* This file may be distributed separately from the Linux kernel, or
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* incorporated into other software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __XEN_EVTCHN_EVTCHNVAR_H__
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#define __XEN_EVTCHN_EVTCHNVAR_H__
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#include <xen/hypervisor.h>
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#include <contrib/xen/event_channel.h>
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/* Macros for accessing event channel values */
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#define EVTCHN_PTR(type, port) \
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(HYPERVISOR_shared_info->evtchn_##type + ((port) / __LONG_BIT))
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#define EVTCHN_BIT(port) ((port) & (__LONG_BIT - 1))
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#define EVTCHN_MASK(port) (1UL << EVTCHN_BIT(port))
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/**
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* Disable signal delivery for an event channel port, returning its
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* previous mask state.
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*
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* \param port The event channel port to query and mask.
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*
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* \returns 1 if event delivery was previously disabled. Otherwise 0.
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*/
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static inline int
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evtchn_test_and_set_mask(evtchn_port_t port)
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{
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return (atomic_testandset_xen_ulong(EVTCHN_PTR(mask, port),
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EVTCHN_BIT(port)));
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}
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/**
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* Clear any pending event for the given event channel port.
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*
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* \param port The event channel port to clear.
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*/
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static inline void
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evtchn_clear_port(evtchn_port_t port)
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{
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atomic_clear_xen_ulong(EVTCHN_PTR(pending, port), EVTCHN_MASK(port));
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}
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/**
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* Disable signal delivery for an event channel port.
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*
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* \param port The event channel port to mask.
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*/
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static inline void
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evtchn_mask_port(evtchn_port_t port)
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{
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atomic_set_xen_ulong(EVTCHN_PTR(mask, port), EVTCHN_MASK(port));
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}
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/**
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* Enable signal delivery for an event channel port.
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*
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* \param port The event channel port to enable.
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*/
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static inline void
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evtchn_unmask_port(evtchn_port_t port)
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{
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evtchn_unmask_t op = { .port = port };
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HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &op);
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}
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#endif /* __XEN_EVTCHN_EVTCHNVAR_H__ */
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