62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
/*
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* Memory-Buffer Console
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*
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* Copyright (C) 2019-2025 Udo Steinberg, BlueRock Security, Inc.
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*
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* This file is part of the NOVA microhypervisor.
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*
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* NOVA is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* NOVA is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License version 2 for more details.
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*/
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#pragma once
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#include "atomic.hpp"
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#include "buddy.hpp"
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#include "console.hpp"
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#include "kmem.hpp"
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class Sm;
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class Console_mbuf_mmio final
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{
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public:
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Atomic<uint32_t, __ATOMIC_RELAXED, __ATOMIC_RELAXED> r_idx { 0 };
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Atomic<uint32_t, __ATOMIC_RELAXED, __ATOMIC_SEQ_CST> w_idx { 0 };
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static constexpr unsigned ord { 0 };
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static constexpr unsigned size { BIT (PAGE_BITS + ord) };
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static constexpr unsigned entries { size - sizeof (r_idx) - sizeof (w_idx) };
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Atomic<char> buffer[entries];
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[[nodiscard]] static void *operator new (size_t) noexcept
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{
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return Buddy::alloc (ord, Buddy::Fill::BITS0);
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}
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};
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class Console_mbuf final : private Console
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{
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private:
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Sm *sm { nullptr };
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[[nodiscard]] bool outc (char) const override final;
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Console_mbuf();
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public:
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Console_mbuf_mmio *const regs;
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static Console_mbuf singleton;
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static auto addr() { return Kmem::ptr_to_phys (singleton.regs); }
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static auto size() { return singleton.regs->size; }
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};
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