mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-20 01:37:39 +03:00
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.
66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Format.h>
|
|
#include <AK/Types.h>
|
|
|
|
typedef u64 PhysicalPtr;
|
|
typedef u64 PhysicalSize;
|
|
|
|
class PhysicalAddress {
|
|
public:
|
|
ALWAYS_INLINE static PhysicalPtr physical_page_base(PhysicalPtr page_address) { return page_address & ~(PhysicalPtr)0xfff; }
|
|
ALWAYS_INLINE static size_t physical_page_index(PhysicalPtr page_address)
|
|
{
|
|
auto page_index = page_address >> 12;
|
|
if constexpr (sizeof(size_t) < sizeof(PhysicalPtr))
|
|
VERIFY(!(page_index & ~(PhysicalPtr)((size_t)-1)));
|
|
return (size_t)(page_index);
|
|
}
|
|
|
|
PhysicalAddress() = default;
|
|
explicit PhysicalAddress(PhysicalPtr address)
|
|
: m_address(address)
|
|
{
|
|
}
|
|
|
|
[[nodiscard]] PhysicalAddress offset(PhysicalPtr o) const { return PhysicalAddress(m_address + o); }
|
|
[[nodiscard]] PhysicalPtr get() const { return m_address; }
|
|
void set(PhysicalPtr address) { m_address = address; }
|
|
void mask(PhysicalPtr m) { m_address &= m; }
|
|
|
|
[[nodiscard]] bool is_null() const { return m_address == 0; }
|
|
|
|
[[nodiscard]] u8* as_ptr() { return reinterpret_cast<u8*>(m_address); }
|
|
[[nodiscard]] const u8* as_ptr() const { return reinterpret_cast<const u8*>(m_address); }
|
|
|
|
[[nodiscard]] PhysicalAddress page_base() const { return PhysicalAddress(physical_page_base(m_address)); }
|
|
[[nodiscard]] PhysicalPtr offset_in_page() const { return PhysicalAddress(m_address & 0xfff).get(); }
|
|
|
|
bool operator==(const PhysicalAddress& other) const { return m_address == other.m_address; }
|
|
bool operator!=(const PhysicalAddress& other) const { return m_address != other.m_address; }
|
|
bool operator>(const PhysicalAddress& other) const { return m_address > other.m_address; }
|
|
bool operator>=(const PhysicalAddress& other) const { return m_address >= other.m_address; }
|
|
bool operator<(const PhysicalAddress& other) const { return m_address < other.m_address; }
|
|
bool operator<=(const PhysicalAddress& other) const { return m_address <= other.m_address; }
|
|
|
|
private:
|
|
PhysicalPtr m_address { 0 };
|
|
};
|
|
|
|
template<>
|
|
struct AK::Formatter<PhysicalAddress> : AK::Formatter<FormatString> {
|
|
void format(FormatBuilder& builder, PhysicalAddress value)
|
|
{
|
|
if constexpr (sizeof(PhysicalPtr) == sizeof(u64))
|
|
return AK::Formatter<FormatString>::format(builder, "P{:016x}", value.get());
|
|
else
|
|
return AK::Formatter<FormatString>::format(builder, "P{}", value.as_ptr());
|
|
}
|
|
};
|