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4314c25cf2
All users which relied on the default constructor use a None lock rank for now. This will make it easier to in the future remove LockRank and actually annotate the ranks by searching for None.
41 lines
1.5 KiB
C++
41 lines
1.5 KiB
C++
/*
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* Copyright (c) 2021, Sahan Fernando <sahan.h.fernando@gmail.com>.
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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 <Kernel/PhysicalAddress.h>
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#include <Kernel/UserOrKernelBuffer.h>
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namespace Kernel::Memory {
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class RingBuffer {
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public:
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static ErrorOr<NonnullOwnPtr<RingBuffer>> try_create(StringView region_name, size_t capacity);
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bool has_space() const { return m_num_used_bytes < m_capacity_in_bytes; }
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bool copy_data_in(UserOrKernelBuffer const& buffer, size_t offset, size_t length, PhysicalAddress& start_of_copied_data, size_t& bytes_copied);
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ErrorOr<size_t> copy_data_out(size_t size, UserOrKernelBuffer& buffer) const;
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ErrorOr<PhysicalAddress> reserve_space(size_t size);
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void reclaim_space(PhysicalAddress chunk_start, size_t chunk_size);
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PhysicalAddress start_of_used() const;
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Spinlock& lock() { return m_lock; }
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size_t used_bytes() const { return m_num_used_bytes; }
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PhysicalAddress start_of_region() const { return m_region->physical_page(0)->paddr(); }
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VirtualAddress vaddr() const { return m_region->vaddr(); }
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size_t bytes_till_end() const { return (m_capacity_in_bytes - ((m_start_of_used + m_num_used_bytes) % m_capacity_in_bytes)) % m_capacity_in_bytes; };
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private:
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RingBuffer(NonnullOwnPtr<Memory::Region> region, size_t capacity);
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NonnullOwnPtr<Memory::Region> m_region;
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Spinlock m_lock { LockRank::None };
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size_t m_start_of_used {};
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size_t m_num_used_bytes {};
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size_t m_capacity_in_bytes {};
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};
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}
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