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e10b9d6602
Currently, lock of uart in bhyve is placed in frontend. There are some problems about it: 1. If every frontend should has a lock, why not move it inside backend as they all have same uart_softc. 2. If backend needs to modify the information of uart after initialize, it will be impossible as backend cannot use lock. For example, if we want implement a telnet support for uart in backend, It should wait for connection when initialize. After some remote process connect it, it needs to modify rfd and wfd in backend. So I decide to move it to backend. Reviewed by: corvink, jhb, markj Differential Revision: https://reviews.freebsd.org/D44947
57 lines
2.2 KiB
C
57 lines
2.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2012 NetApp, Inc.
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* Copyright (c) 2013 Neel Natu <neel@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _UART_BACKEND_H_
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#define _UART_BACKEND_H_
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#include <stdbool.h>
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#include "mevent.h"
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struct uart_softc;
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struct vm_snapshot_meta;
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void uart_rxfifo_drain(struct uart_softc *sc, bool loopback);
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int uart_rxfifo_getchar(struct uart_softc *sc);
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int uart_rxfifo_numchars(struct uart_softc *sc);
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int uart_rxfifo_putchar(struct uart_softc *sc, uint8_t ch, bool loopback);
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void uart_rxfifo_reset(struct uart_softc *sc, int size);
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int uart_rxfifo_size(struct uart_softc *sc);
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#ifdef BHYVE_SNAPSHOT
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int uart_rxfifo_snapshot(struct uart_softc *sc,
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struct vm_snapshot_meta *meta);
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#endif
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struct uart_softc *uart_init(void);
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int uart_tty_open(struct uart_softc *sc, const char *path,
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void (*drain)(int, enum ev_type, void *), void *arg);
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void uart_softc_lock(struct uart_softc *sc);
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void uart_softc_unlock(struct uart_softc *sc);
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#endif /* _UART_BACKEND_H_ */
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