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/*
* Copyright (c) 2021, Nico Weber <thakis@chromium.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Types.h>
namespace Prekernel {
// Can exchange mailbox messages with the Raspberry Pi's VideoCore chip.
// https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
class Mailbox {
public:
// Base class for Mailbox messages. Implemented in subsystems that use Mailbox.
class Message {
protected:
Message(u32 tag, u32 arguments_size);
private:
u32 m_tag;
u32 m_arguments_size;
u32 m_command_tag;
};
// Must be at the beginning of every command message queue
class MessageHeader {
public:
MessageHeader();
u32 queue_size() { return m_message_queue_size; }
void set_queue_size(u32 size) { m_message_queue_size = size; }
bool success() const;
private:
u32 m_message_queue_size;
u32 m_command_tag;
};
// Must be at the end of every command message queue
class MessageTail {
private:
u32 m_empty_tag = 0;
};
static Mailbox& the();
// Sends message queue to VideoCore
bool send_queue(void* queue, u32 queue_size) const;
};
}
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