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What does this statement mean?

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11-17-2007

Legend986

Registered User

Join Date: Sep 2007

Posts: 171

What does this statement mean?

If I declare a structure as:

Code:

typedef struct
	{
		int id;
		void* ptr;
		int size;
	} kpage_t;

And then use this to do some initialization...

Code:

*((kpage_t**)page->ptr) = page;

What exactly is being done? I have some trouble with pointers here...

And if there's a macro BASEADDRESS(x) defined as

Code:

((void*)(((int) (x)) & ~(PAGESIZE-1)))

What exactly is happening here assuming that PAGESIZE is a power of two number...

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