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3cc5752a69
The goal was to reduce common setup of messages. Changes: * MailBox turned into singleton to follow existing patterns * Removed device specific messages from MailBox requiring clients to know the details instead * Created base Message class which clients should deriver from It really simplify the usage for more complicated message queues like framebuffer setup - see followup commits.
54 lines
1.2 KiB
C++
54 lines
1.2 KiB
C++
/*
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* Copyright (c) 2021, Nico Weber <thakis@chromium.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Types.h>
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namespace Prekernel {
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// Can exchange mailbox messages with the Raspberry Pi's VideoCore chip.
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// https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
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class Mailbox {
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public:
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// Base class for Mailbox messages. Implemented in subsystems that use Mailbox.
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class Message {
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protected:
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Message(u32 tag, u32 arguments_size);
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private:
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u32 m_tag;
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u32 m_arguments_size;
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u32 m_command_tag;
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};
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// Must be at the beginning of every command message queue
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class MessageHeader {
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public:
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MessageHeader();
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u32 queue_size() { return m_message_queue_size; }
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void set_queue_size(u32 size) { m_message_queue_size = size; }
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bool success() const;
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private:
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u32 m_message_queue_size;
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u32 m_command_tag;
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};
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// Must be at the end of every command message queue
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class MessageTail {
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private:
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u32 m_empty_tag = 0;
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};
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static Mailbox& the();
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// Sends message queue to VideoCore
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bool send_queue(void* queue, u32 queue_size) const;
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};
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}
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