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/*
* FIFO-based event channel ABI.
*
* Copyright (C) 2013 Citrix Systems R&D Ltd.
*
* This source code is licensed under the GNU General Public License,
* Version 2 or later. See the file COPYING for more details.
*/
#ifndef __XEN_EVENT_FIFO_H__
#define __XEN_EVENT_FIFO_H__
struct evtchn_fifo_queue {
uint32_t *head; /* points into control block */
uint32_t tail;
uint8_t priority;
spinlock_t lock;
};
struct evtchn_fifo_vcpu {
struct evtchn_fifo_control_block *control_block;
struct evtchn_fifo_queue queue[EVTCHN_FIFO_MAX_QUEUES];
};
#define EVTCHN_FIFO_EVENT_WORDS_PER_PAGE (PAGE_SIZE / sizeof(event_word_t))
#define EVTCHN_FIFO_MAX_EVENT_ARRAY_PAGES \
(EVTCHN_FIFO_NR_CHANNELS / EVTCHN_FIFO_EVENT_WORDS_PER_PAGE)
struct evtchn_fifo_domain {
event_word_t *event_array[EVTCHN_FIFO_MAX_EVENT_ARRAY_PAGES];
unsigned int num_evtchns;
};
int evtchn_fifo_init_control(struct evtchn_init_control *init_control);
int evtchn_fifo_expand_array(const struct evtchn_expand_array *expand_array);
void evtchn_fifo_destroy(struct domain *domain);
#endif /* __XEN_EVENT_FIFO_H__ */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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