Kernel: Make PageDirectory.cpp compile on aarch64

1 files changed, 65 insertions, 0 deletions

diff --git a/Kernel/Arch/PageFault.h b/Kernel/Arch/PageFault.h
new file mode 100644
index 0000000000..1d939d8ea2
--- /dev/null
+++ b/Kernel/Arch/PageFault.h
@@ -0,0 +1,65 @@
+/*
+ * 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;
+};
+
+}