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/*
 * Physical memory descriptors
 *
 * Copyright (C) 2007 - 2009 Bahadir Balban
 */
#ifndef __PAGER_PHYSMEM_H__
#define __PAGER_PHYSMEM_H__
 
/* A compact memory descriptor to determine used/unused pages in the system */
struct page_bitmap {
	unsigned long pfn_start;
	unsigned long pfn_end;
	unsigned int map[];
};
 
/* Describes a portion of physical memory. */
struct memdesc {
	unsigned int start;
	unsigned int end;
	unsigned int free_cur;
	unsigned int free_end;
	unsigned int numpages;
};
 
struct membank {
	unsigned long start;
	unsigned long end;
	unsigned long free;
	struct page *page_array;
};
extern struct membank membank[];
 
/* Describes bitmap of used/unused state for all physical pages */
extern struct memdesc physmem;
 
/* Sets the global page map as used/unused. Aligns input when needed. */
int set_page_map(struct page_bitmap *pmap, unsigned long start,
		 int numpages, int val);
 
void init_physmem_primary();
void init_physmem_secondary(struct membank *membank);
 
#endif /* __PAGER_PHYSMEM_H__ */