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#pragma once
#include <AK/AKString.h>
#include <AK/Bitmap.h>
#include <Kernel/VM/PageDirectory.h>
#include <Kernel/VM/RangeAllocator.h>
class Inode;
class VMObject;
class Region : public Retainable<Region> {
friend class MemoryManager;
public:
Region(const Range&, String&&, bool r, bool w, bool cow = false);
Region(const Range&, Retained<VMObject>&&, size_t offset_in_vmo, String&&, bool r, bool w, bool cow = false);
Region(const Range&, RetainPtr<Inode>&&, String&&, bool r, bool w);
~Region();
LinearAddress laddr() const { return m_range.base(); }
size_t size() const { return m_range.size(); }
bool is_readable() const { return m_readable; }
bool is_writable() const { return m_writable; }
String name() const { return m_name; }
void set_name(String&& name) { m_name = move(name); }
const VMObject& vmo() const { return *m_vmo; }
VMObject& vmo() { return *m_vmo; }
bool is_shared() const { return m_shared; }
void set_shared(bool shared) { m_shared = shared; }
Retained<Region> clone();
bool contains(LinearAddress laddr) const
{
return m_range.contains(laddr);
}
unsigned page_index_from_address(LinearAddress laddr) const
{
return (laddr - m_range.base()).get() / PAGE_SIZE;
}
size_t first_page_index() const
{
return m_offset_in_vmo / PAGE_SIZE;
}
size_t last_page_index() const
{
return (first_page_index() + page_count()) - 1;
}
size_t page_count() const
{
return size() / PAGE_SIZE;
}
bool page_in();
int commit();
size_t amount_resident() const;
size_t amount_shared() const;
PageDirectory* page_directory() { return m_page_directory.ptr(); }
void set_page_directory(PageDirectory& page_directory)
{
ASSERT(!m_page_directory || m_page_directory == &page_directory);
m_page_directory = page_directory;
}
void release_page_directory()
{
ASSERT(m_page_directory);
m_page_directory.clear();
}
bool should_cow(size_t page_index) const { return m_cow_map.get(page_index); }
void set_should_cow(size_t page_index, bool cow) { m_cow_map.set(page_index, cow); }
void set_writable(bool b) { m_writable = b; }
private:
RetainPtr<PageDirectory> m_page_directory;
Range m_range;
size_t m_offset_in_vmo { 0 };
Retained<VMObject> m_vmo;
String m_name;
bool m_readable { true };
bool m_writable { true };
bool m_shared { false };
Bitmap m_cow_map;
};
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