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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
41 lines
1.4 KiB
C++
41 lines
1.4 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 <AK/String.h>
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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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RingBuffer(String 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(const UserOrKernelBuffer& 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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OwnPtr<Memory::Region> m_region;
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Spinlock m_lock;
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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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