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https://github.com/RGBCube/serenity
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87dc4c3d2c
By moving the PhysicalPage classes out of the kernel heap into a static array, one for each physical page, we can avoid the added overhead and easily find them by indexing into an array. This also wraps the PhysicalPage into a PhysicalPageEntry, which allows us to re-use each slot with information where to find the next free page.
65 lines
2.5 KiB
C++
65 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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/Format.h>
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#include <AK/Types.h>
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typedef u64 PhysicalPtr;
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typedef u64 PhysicalSize;
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class PhysicalAddress {
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public:
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ALWAYS_INLINE static PhysicalPtr physical_page_base(PhysicalPtr page_address) { return page_address & ~(PhysicalPtr)0xfff; }
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ALWAYS_INLINE static size_t physical_page_index(PhysicalPtr page_address)
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{
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auto page_index = page_address >> 12;
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if constexpr (sizeof(size_t) < sizeof(PhysicalPtr))
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VERIFY(!(page_index & ~(PhysicalPtr)((size_t)-1)));
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return (size_t)(page_index);
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}
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PhysicalAddress() = default;
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explicit PhysicalAddress(PhysicalPtr address)
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: m_address(address)
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{
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}
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[[nodiscard]] PhysicalAddress offset(PhysicalPtr o) const { return PhysicalAddress(m_address + o); }
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[[nodiscard]] PhysicalPtr get() const { return m_address; }
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void set(PhysicalPtr address) { m_address = address; }
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void mask(PhysicalPtr m) { m_address &= m; }
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[[nodiscard]] bool is_null() const { return m_address == 0; }
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[[nodiscard]] u8* as_ptr() { return reinterpret_cast<u8*>(m_address); }
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[[nodiscard]] const u8* as_ptr() const { return reinterpret_cast<const u8*>(m_address); }
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[[nodiscard]] PhysicalAddress page_base() const { return PhysicalAddress(physical_page_base(m_address)); }
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[[nodiscard]] PhysicalPtr offset_in_page() const { return PhysicalAddress(m_address & 0xfff).get(); }
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bool operator==(const PhysicalAddress& other) const { return m_address == other.m_address; }
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bool operator!=(const PhysicalAddress& other) const { return m_address != other.m_address; }
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bool operator>(const PhysicalAddress& other) const { return m_address > other.m_address; }
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bool operator>=(const PhysicalAddress& other) const { return m_address >= other.m_address; }
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bool operator<(const PhysicalAddress& other) const { return m_address < other.m_address; }
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bool operator<=(const PhysicalAddress& other) const { return m_address <= other.m_address; }
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private:
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PhysicalPtr m_address { 0 };
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};
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template<>
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struct AK::Formatter<PhysicalAddress> : AK::Formatter<FormatString> {
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void format(FormatBuilder& builder, PhysicalAddress value)
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{
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if constexpr (sizeof(PhysicalPtr) == sizeof(u64))
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return AK::Formatter<FormatString>::format(builder, "P{:016x}", value.get());
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else
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return AK::Formatter<FormatString>::format(builder, "P{}", value.as_ptr());
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}
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};
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