sdk/fidl/fuchsia.hardware.mailbox/mailbox.fidl

// Copyright 2022 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
@available(added=HEAD)
library fuchsia.hardware.mailbox;

using zx;

/// `Channel` represents a single mailbox channel that can be used to send messages to a
/// destination core.
@discoverable
open protocol Channel {
    /// Writes the message to the mailbox, interrupts the destination core, and (if applicable)
    /// waits for the destination core to ack the message.
    ///
    /// Returns `ZX_ERR_OUT_OF_RANGE` if `message` is larger than what the hardware can support.
    strict SendMessage(struct {
        message vector<uint8>:MAX;
    }) -> () error zx.Status;
};

service Service {
    channel client_end:Channel;
};