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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * IMPORTANT: The following constants must match the ones used and defined in4 * external/qemu/include/hw/misc/goldfish_pipe.h5 */6 7#ifndef GOLDFISH_PIPE_QEMU_H8#define GOLDFISH_PIPE_QEMU_H9 10/* List of bitflags returned in status of CMD_POLL command */11enum PipePollFlags {12 PIPE_POLL_IN = 1 << 0,13 PIPE_POLL_OUT = 1 << 1,14 PIPE_POLL_HUP = 1 << 215};16 17/* Possible status values used to signal errors */18enum PipeErrors {19 PIPE_ERROR_INVAL = -1,20 PIPE_ERROR_AGAIN = -2,21 PIPE_ERROR_NOMEM = -3,22 PIPE_ERROR_IO = -423};24 25/* Bit-flags used to signal events from the emulator */26enum PipeWakeFlags {27 /* emulator closed pipe */28 PIPE_WAKE_CLOSED = 1 << 0,29 30 /* pipe can now be read from */31 PIPE_WAKE_READ = 1 << 1,32 33 /* pipe can now be written to */34 PIPE_WAKE_WRITE = 1 << 2,35 36 /* unlock this pipe's DMA buffer */37 PIPE_WAKE_UNLOCK_DMA = 1 << 3,38 39 /* unlock DMA buffer of the pipe shared to this pipe */40 PIPE_WAKE_UNLOCK_DMA_SHARED = 1 << 4,41};42 43/* Possible pipe closing reasons */44enum PipeCloseReason {45 /* guest sent a close command */46 PIPE_CLOSE_GRACEFUL = 0,47 48 /* guest rebooted, we're closing the pipes */49 PIPE_CLOSE_REBOOT = 1,50 51 /* close old pipes on snapshot load */52 PIPE_CLOSE_LOAD_SNAPSHOT = 2,53 54 /* some unrecoverable error on the pipe */55 PIPE_CLOSE_ERROR = 3,56};57 58/* Bit flags for the 'flags' field */59enum PipeFlagsBits {60 BIT_CLOSED_ON_HOST = 0, /* pipe closed by host */61 BIT_WAKE_ON_WRITE = 1, /* want to be woken on writes */62 BIT_WAKE_ON_READ = 2, /* want to be woken on reads */63};64 65enum PipeRegs {66 PIPE_REG_CMD = 0,67 68 PIPE_REG_SIGNAL_BUFFER_HIGH = 4,69 PIPE_REG_SIGNAL_BUFFER = 8,70 PIPE_REG_SIGNAL_BUFFER_COUNT = 12,71 72 PIPE_REG_OPEN_BUFFER_HIGH = 20,73 PIPE_REG_OPEN_BUFFER = 24,74 75 PIPE_REG_VERSION = 36,76 77 PIPE_REG_GET_SIGNALLED = 48,78};79 80enum PipeCmdCode {81 /* to be used by the pipe device itself */82 PIPE_CMD_OPEN = 1,83 84 PIPE_CMD_CLOSE,85 PIPE_CMD_POLL,86 PIPE_CMD_WRITE,87 PIPE_CMD_WAKE_ON_WRITE,88 PIPE_CMD_READ,89 PIPE_CMD_WAKE_ON_READ,90 91 /*92 * TODO(zyy): implement a deferred read/write execution to allow93 * parallel processing of pipe operations on the host.94 */95 PIPE_CMD_WAKE_ON_DONE_IO,96};97 98#endif /* GOLDFISH_PIPE_QEMU_H */99