136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
/****************************************************************************
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* drivers/misc/goldfish_pipe_qemu.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __GOLDFISH_PIPE_QEMU_H
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#define __GOLDFISH_PIPE_QEMU_H
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/* List of bitflags returned in status of CMD_POLL command */
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enum pipepollflags
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{
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PIPE_POLL_IN = 1 << 0,
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PIPE_POLL_OUT = 1 << 1,
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PIPE_POLL_HUP = 1 << 2
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};
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/* Possible status values used to signal errors */
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enum pipeerrors
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{
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PIPE_ERROR_INVAL = -1,
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PIPE_ERROR_AGAIN = -2,
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PIPE_ERROR_NOMEM = -3,
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PIPE_ERROR_IO = -4
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};
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/* Bit-flags used to signal events from the emulator */
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enum pipewakeflags
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{
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/* emulator closed pipe */
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PIPE_WAKE_CLOSED = 1 << 0,
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/* pipe can now be read from */
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PIPE_WAKE_READ = 1 << 1,
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/* pipe can now be written to */
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PIPE_WAKE_WRITE = 1 << 2,
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/* unlock this pipe's DMA buffer */
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PIPE_WAKE_UNLOCK_DMA = 1 << 3,
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/* unlock DMA buffer of the pipe shared to this pipe */
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PIPE_WAKE_UNLOCK_DMA_SHARED = 1 << 4,
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};
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/* Possible pipe closing reasons */
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enum pipeclosereason
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{
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/* guest sent a close command */
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PIPE_CLOSE_GRACEFUL = 0,
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/* guest rebooted, we're closing the pipes */
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PIPE_CLOSE_REBOOT = 1,
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/* close old pipes on snapshot load */
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PIPE_CLOSE_LOAD_SNAPSHOT = 2,
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/* some unrecoverable error on the pipe */
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PIPE_CLOSE_ERROR = 3,
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};
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/* Bit flags for the 'flags' field */
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enum pipeflagsbits
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{
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BIT_CLOSED_ON_HOST = 0, /* pipe closed by host */
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BIT_WAKE_ON_WRITE = 1, /* want to be woken on writes */
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BIT_WAKE_ON_READ = 2, /* want to be woken on reads */
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};
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enum piperegs
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{
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PIPE_REG_CMD = 0,
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PIPE_REG_SIGNAL_BUFFER_HIGH = 4,
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PIPE_REG_SIGNAL_BUFFER = 8,
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PIPE_REG_SIGNAL_BUFFER_COUNT = 12,
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PIPE_REG_OPEN_BUFFER_HIGH = 20,
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PIPE_REG_OPEN_BUFFER = 24,
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PIPE_REG_VERSION = 36,
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PIPE_REG_GET_SIGNALLED = 48,
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};
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enum pipecmdcode
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{
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/* to be used by the pipe device itself */
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PIPE_CMD_OPEN = 1,
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PIPE_CMD_CLOSE,
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PIPE_CMD_POLL,
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PIPE_CMD_WRITE,
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PIPE_CMD_WAKE_ON_WRITE,
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PIPE_CMD_READ,
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PIPE_CMD_WAKE_ON_READ,
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/**
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* TODO(zyy): implement a deferred read/write execution to allow
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* parallel processing of pipe operations on the host.
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*/
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PIPE_CMD_WAKE_ON_DONE_IO,
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};
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#endif /* __GOLDFISH_PIPE_QEMU_H */
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