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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "SoftMMU.h"
#include <sys/mman.h>
namespace UserspaceEmulator {
class SharedBufferRegion final : public SoftMMU::Region {
public:
static NonnullOwnPtr<SharedBufferRegion> create_with_shbuf_id(u32 base, u32 size, int shbuf_id, u8* shbuf_data);
virtual ~SharedBufferRegion() override;
virtual u8 read8(u32 offset) override;
virtual u16 read16(u32 offset) override;
virtual u32 read32(u32 offset) override;
virtual void write8(u32 offset, u8 value) override;
virtual void write16(u32 offset, u16 value) override;
virtual void write32(u32 offset, u32 value) override;
u8* data() { return m_data; }
bool is_shared_buffer() const override { return true; }
int shbuf_id() const { return m_shbuf_id; }
int allow_all();
int allow_pid(pid_t);
int seal();
int release();
int set_volatile(bool);
private:
SharedBufferRegion(u32 base, u32 size, int shbuf_id, u8* shbuf_data);
u8* m_data { nullptr };
int m_shbuf_id { 0 };
};
}
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