common.h

#ifndef __common_h__5872395623940562390452903457234__
#define __common_h__5872395623940562390452903457234__

const uint32_t PROCESS_MAX = 64;

class CCPU {
public:
	static const uint32_t OFFSET_BITS = 12;
	static const uint32_t PAGE_SIZE = 1 << OFFSET_BITS; // 4096 (binary 000000000000000001000000000000)
	static const uint32_t PAGE_DIR_ENTRIES = PAGE_SIZE / 4; // 1024
	static const uint32_t ADDR_MASK = ~(PAGE_SIZE - 1); // 4294963200 (binary 11111111111111111111000000000000)
	static const uint32_t BIT_PRESENT = 0x0001;
	static const uint32_t BIT_WRITE = 0x0002;
	static const uint32_t BIT_USER = 0x0004;
	static const uint32_t BIT_REFERENCED = 0x0020;
	static const uint32_t BIT_DIRTY = 0x0040;

	CCPU(uint8_t* memStart, uint32_t pageTableRoot);

	virtual ~CCPU(void)
	{ }

	virtual uint32_t GetMemLimit(void) const = 0;
	virtual bool SetMemLimit(uint32_t pages) = 0;
	virtual bool NewProcess(void* processArg, void (* entryPoint)(CCPU*, void*), bool copyMem) = 0;

	bool ReadInt(uint32_t address, uint32_t& value);
	bool WriteInt(uint32_t address, uint32_t value);
protected:
	uint32_t* virtual2Physical(uint32_t address, bool write);

	virtual bool pageFaultHandler(uint32_t address, bool write)
	{
		return false;
	}

	uint8_t* m_MemStart;
	uint32_t m_PageTableRoot;
};


void MemMgr(void* mem, uint32_t totalPages, void* processArg, void (* mainProcess)(CCPU*, void*));

#endif /* __common_h__5872395623940562390452903457234__ */