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#ifndef _PPC_PAGE_H
#define _PPC_PAGE_H
 
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT	12
#define PAGE_SIZE	(1UL << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE-1))
 
void invalidate(void);
 
#ifdef __KERNEL__
 
#define STRICT_MM_TYPECHECKS
 
#ifdef STRICT_MM_TYPECHECKS
/*
 * These are used to make use of C type-checking..
 */
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
 
#define pte_val(x)	((x).pte)
#define pmd_val(x)	((x).pmd)
#define pgd_val(x)	((x).pgd)
#define pgprot_val(x)	((x).pgprot)
 
#define __pte(x)	((pte_t) { (x) } )
#define __pmd(x)	((pmd_t) { (x) } )
#define __pgd(x)	((pgd_t) { (x) } )
#define __pgprot(x)	((pgprot_t) { (x) } )
 
#else
/*
 * .. while these make it easier on the compiler
 */
typedef unsigned long pte_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;
 
#define pte_val(x)	(x)
#define pmd_val(x)	(x)
#define pgd_val(x)	(x)
#define pgprot_val(x)	(x)
 
#define __pte(x)	(x)
#define __pmd(x)	(x)
#define __pgd(x)	(x)
#define __pgprot(x)	(x)
 
#endif
 
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)
 
/* This handles the memory map.. */
 
#define KERNELBASE	0x90000000
#define PAGE_OFFSET	KERNELBASE
#define MAP_NR(addr)	((((unsigned long)addr) - PAGE_OFFSET) >> PAGE_SHIFT)
#define MAP_PAGE_RESERVED	(1<<15)
 
 
#if 0  /* Now defined in "mm.h" */
/*
 * This used to be an unsigned short...
 * 
 *                         -- Cort
 */
/*typedef unsigned short mem_map_t;*/
 
typedef struct {
	unsigned count:30,
		 dirty:1,
		 reserved:1;
} mem_map_t;
#endif
 
/* Certain architectures need to do special things when pte's
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */
#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
 
 
#endif /* __KERNEL__ */
 
#endif /* _PPC_PAGE_H */