mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 10:48:11 +00:00
1492bb2fd6
This allows two-way communication with the host through a VirtIOConsole. This is necessary for features like clipboard sharing.
37 lines
1.1 KiB
C++
37 lines
1.1 KiB
C++
/*
|
|
* Copyright (c) 2021, Sahan Fernando <sahan.h.fernando@gmail.com>.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/String.h>
|
|
#include <Kernel/PhysicalAddress.h>
|
|
|
|
namespace Kernel {
|
|
|
|
class RingBuffer {
|
|
public:
|
|
RingBuffer(String region_name, size_t capacity);
|
|
|
|
bool has_space() const { return m_num_used_bytes < m_capacity_in_bytes; }
|
|
bool copy_data_in(const UserOrKernelBuffer& buffer, size_t offset, size_t length, PhysicalAddress& start_of_copied_data, size_t& bytes_copied);
|
|
KResultOr<size_t> copy_data_out(size_t size, UserOrKernelBuffer& buffer) const;
|
|
KResultOr<PhysicalAddress> reserve_space(size_t size);
|
|
void reclaim_space(PhysicalAddress chunk_start, size_t chunk_size);
|
|
PhysicalAddress start_of_used() const;
|
|
|
|
SpinLock<u8>& lock() { return m_lock; }
|
|
size_t used_bytes() const { return m_num_used_bytes; }
|
|
PhysicalAddress start_of_region() const { return m_region->physical_page(0)->paddr(); }
|
|
|
|
private:
|
|
OwnPtr<Region> m_region;
|
|
SpinLock<u8> m_lock;
|
|
size_t m_start_of_used {};
|
|
size_t m_num_used_bytes {};
|
|
size_t m_capacity_in_bytes {};
|
|
};
|
|
|
|
}
|