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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Badge.h>
#include <AK/Types.h>
namespace Kernel {
class PageDirectory;
class PageTableEntry;
class PageDirectoryEntry {
public:
const PageTableEntry* page_table_base() const { return reinterpret_cast<PageTableEntry*>(m_raw & 0xfffff000u); }
PageTableEntry* page_table_base() { return reinterpret_cast<PageTableEntry*>(m_raw & 0xfffff000u); }
void set_page_table_base(u32 value)
{
m_raw &= 0x8000000000000fffULL;
m_raw |= value & 0xfffff000;
}
bool is_null() const { return m_raw == 0; }
void clear() { m_raw = 0; }
u64 raw() const { return m_raw; }
void copy_from(Badge<PageDirectory>, const PageDirectoryEntry& other) { m_raw = other.m_raw; }
enum Flags {
Present = 1 << 0,
ReadWrite = 1 << 1,
UserSupervisor = 1 << 2,
WriteThrough = 1 << 3,
CacheDisabled = 1 << 4,
Huge = 1 << 7,
Global = 1 << 8,
NoExecute = 0x8000000000000000ULL,
};
bool is_present() const { return raw() & Present; }
void set_present(bool b) { set_bit(Present, b); }
bool is_user_allowed() const { return raw() & UserSupervisor; }
void set_user_allowed(bool b) { set_bit(UserSupervisor, b); }
bool is_huge() const { return raw() & Huge; }
void set_huge(bool b) { set_bit(Huge, b); }
bool is_writable() const { return raw() & ReadWrite; }
void set_writable(bool b) { set_bit(ReadWrite, b); }
bool is_write_through() const { return raw() & WriteThrough; }
void set_write_through(bool b) { set_bit(WriteThrough, b); }
bool is_cache_disabled() const { return raw() & CacheDisabled; }
void set_cache_disabled(bool b) { set_bit(CacheDisabled, b); }
bool is_global() const { return raw() & Global; }
void set_global(bool b) { set_bit(Global, b); }
bool is_execute_disabled() const { return raw() & NoExecute; }
void set_execute_disabled(bool b) { set_bit(NoExecute, b); }
void set_bit(u64 bit, bool value)
{
if (value)
m_raw |= bit;
else
m_raw &= ~bit;
}
private:
u64 m_raw;
};
class PageTableEntry {
public:
void* physical_page_base() { return reinterpret_cast<void*>(m_raw & 0xfffff000u); }
void set_physical_page_base(u32 value)
{
m_raw &= 0x8000000000000fffULL;
m_raw |= value & 0xfffff000;
}
u64 raw() const { return (u32)m_raw; }
enum Flags {
Present = 1 << 0,
ReadWrite = 1 << 1,
UserSupervisor = 1 << 2,
WriteThrough = 1 << 3,
CacheDisabled = 1 << 4,
Global = 1 << 8,
NoExecute = 0x8000000000000000ULL,
};
bool is_present() const { return raw() & Present; }
void set_present(bool b) { set_bit(Present, b); }
bool is_user_allowed() const { return raw() & UserSupervisor; }
void set_user_allowed(bool b) { set_bit(UserSupervisor, b); }
bool is_writable() const { return raw() & ReadWrite; }
void set_writable(bool b) { set_bit(ReadWrite, b); }
bool is_write_through() const { return raw() & WriteThrough; }
void set_write_through(bool b) { set_bit(WriteThrough, b); }
bool is_cache_disabled() const { return raw() & CacheDisabled; }
void set_cache_disabled(bool b) { set_bit(CacheDisabled, b); }
bool is_global() const { return raw() & Global; }
void set_global(bool b) { set_bit(Global, b); }
bool is_execute_disabled() const { return raw() & NoExecute; }
void set_execute_disabled(bool b) { set_bit(NoExecute, b); }
bool is_null() const { return m_raw == 0; }
void clear() { m_raw = 0; }
void set_bit(u64 bit, bool value)
{
if (value)
m_raw |= bit;
else
m_raw &= ~bit;
}
private:
u64 m_raw;
};
static_assert(sizeof(PageDirectoryEntry) == 8);
static_assert(sizeof(PageTableEntry) == 8);
class PageDirectoryPointerTable {
public:
PageDirectoryEntry* directory(size_t index)
{
return (PageDirectoryEntry*)(raw[index] & ~0xfffu);
}
u64 raw[4];
};
}
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