vm_mm.h

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/*
 * /phoenix/kernel/sys/vm_mm.h
 *
 * This file is a part of Phoenix operating system.
 * Copyright (c) 2011-2012, Artyom Lebedev <artyom.lebedev@gmail.com>
 * All rights reserved.
 * See COPYING file for copyright details.
 */

#ifndef VM_MM_H_
#define VM_MM_H_

#include <vm_page.h>

namespace vm {

class QuickMap {
public:
    enum {
        MAX_PAGES = 64,
    };

    QuickMap(Vaddr mapBase, size_t numPages, void **mapPte);
    ~QuickMap();

    Vaddr Map(Paddr pa, long flags = LAT_EF_PRESENT | LAT_EF_WRITE);

    void Unmap(Vaddr va);

private:
    BitString<MAX_PAGES> _mapped; 
    Vaddr _mapBase;
    size_t _numPages;
    void **_mapPte;
};

class MM {
public:
    enum InitState {
        IS_INITIAL,
        IS_PREINITIALIZED,
        IS_INITIALIZING,
        IS_INITIALIZED,
    };

    static inline InitState GetInitState() { return MM::_initState; }

    static void PreInitialize(vaddr_t heap,
                              paddr_t defaultLatRoot,
                              vaddr_t quickMap,
                              void **quickMapPte);

    static void Initialize(void *memMap,
                           size_t memMapNumDesc,
                           size_t memMapDescSize,
                           u32 memMapDescVersion);

    inline Vaddr PhysToVirt(Paddr pa) {
        ASSERT(pa >= _physFirst && pa < _physFirst + _physRange);
        pa -= _physFirst;
        return _physMemMap + pa.IdentityVaddr();
    }

    inline Page &GetPage(Paddr pa) {
        ASSERT(pa >= _physFirst && pa < _physFirst + _physRange);
        return _pageDesc[(pa - _physFirst) / PAGE_SIZE];
    }

    inline bool IsPageManaged(Paddr pa) {
        if (pa < _physFirst || pa >= _physFirst + _physRange) {
            return false;
        }
        Page &page = GetPage(pa);
        return page.GetFlags() & Page::F_MANAGED;
    }

private:
    friend class Page;

    static InitState _initState;

    MM(void *memMap, size_t memMapNumDesc, size_t memMapDescSize,
       u32 memMapDescVersion);

    QuickMap _quickMap;

    Vaddr _physMemMap;
    Paddr _physFirst;
    psize_t _physRange;
    Page *_pageDesc;

    psize_t _physMemSize;

    Paddr _initialStart;
    Paddr _initialEnd;

    Paddr _defLatRoot;

    void _InitializePhysMem(void *memMap, size_t memMapNumDesc,
                            size_t memMapDescSize, u32 memMapDescVersion);
};

extern MM *mm;

} /* namespace vm */

#endif /* VM_MM_H_ */