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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Platform.h>
#include <AK/Types.h>
#include <Kernel/VirtualAddress.h>
namespace Kernel {
struct PageFaultFlags {
enum Flags {
NotPresent = 0x00,
ProtectionViolation = 0x01,
Read = 0x00,
Write = 0x02,
UserMode = 0x04,
SupervisorMode = 0x00,
ReservedBitViolation = 0x08,
InstructionFetch = 0x10,
};
};
class PageFault {
public:
PageFault(u16 code, VirtualAddress vaddr)
: m_code(code)
, m_vaddr(vaddr)
{
}
enum class Type {
PageNotPresent = PageFaultFlags::NotPresent,
ProtectionViolation = PageFaultFlags::ProtectionViolation,
};
enum class Access {
Read = PageFaultFlags::Read,
Write = PageFaultFlags::Write,
};
VirtualAddress vaddr() const { return m_vaddr; }
u16 code() const { return m_code; }
Type type() const { return (Type)(m_code & 1); }
Access access() const { return (Access)(m_code & 2); }
bool is_not_present() const { return (m_code & 1) == PageFaultFlags::NotPresent; }
bool is_protection_violation() const { return (m_code & 1) == PageFaultFlags::ProtectionViolation; }
bool is_read() const { return (m_code & 2) == PageFaultFlags::Read; }
bool is_write() const { return (m_code & 2) == PageFaultFlags::Write; }
bool is_user() const { return (m_code & 4) == PageFaultFlags::UserMode; }
bool is_supervisor() const { return (m_code & 4) == PageFaultFlags::SupervisorMode; }
bool is_instruction_fetch() const { return (m_code & 16) == PageFaultFlags::InstructionFetch; }
private:
u16 m_code;
VirtualAddress m_vaddr;
};
}
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