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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)

/*

 * Subtle: this is an int (not an unsigned long) and so it

 * gets extended to 64 bits the way want (i.e. with 1s).  -- paulus

 */

#define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))

#ifdef __KERNEL__

#include <linux/config.h>

#define PAGE_OFFSET     CONFIG_KERNEL_START

#define KERNELBASE      PAGE_OFFSET

#ifndef __ASSEMBLY__

/*

 * The basic type of a PTE - 64 bits for those CPUs with > 32 bit

 * physical addressing.  For now this just the IBM PPC440.

 */

#ifdef CONFIG_PTE_64BIT

typedef unsigned long long pte_basic_t;

#define PTE_SHIFT       (PAGE_SHIFT - 3)        /* 512 ptes per page */

#define PTE_FMT         "%16Lx"

#else

typedef unsigned long pte_basic_t;

#define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */

#define PTE_FMT         "%.8lx"

#endif

#include <asm/system.h> /* for xmon definition */

#ifdef CONFIG_XMON

#define BUG() do { \

        printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \

        xmon(0); \

} while (0)

#else

#define BUG() do { \

        printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \

        __asm__ __volatile__(".long 0x0"); \

} while (0)

#endif

#define PAGE_BUG(page) do { BUG(); } while (0)

#define STRICT_MM_TYPECHECKS

#ifdef STRICT_MM_TYPECHECKS

/*

 * These are used to make use of C type-checking..

 */

typedef struct { pte_basic_t 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

/* align addr on a size boundry - adjust address up if needed -- Cort */

#define _ALIGN(addr,size)       (((addr)+(size)-1)&(~((size)-1)))

/* to align the pointer to the (next) page boundary */

#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)

extern void clear_page(void *page);

extern void copy_page(void *to, void *from);

extern void clear_user_page(void *page, unsigned long vaddr);

extern void copy_user_page(void *to, void *from, unsigned long vaddr);

extern unsigned long ppc_memstart;

extern unsigned long ppc_memoffset;

#ifndef CONFIG_APUS

#define PPC_MEMSTART    0

#define PPC_MEMOFFSET   PAGE_OFFSET

#else

#define PPC_MEMSTART    ppc_memstart

#define PPC_MEMOFFSET   ppc_memoffset

#endif

#if defined(CONFIG_APUS) && !defined(MODULE)

/* map phys->virtual and virtual->phys for RAM pages */

static inline unsigned long ___pa(unsigned long v)

{

        unsigned long p;

        asm volatile ("1: addis %0, %1, %2;"

                      ".section \".vtop_fixup\",\"aw\";"

                      ".align  1;"

                      ".long   1b;"

                      ".previous;"

                      : "=r" (p)

                      : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));

        return p;

}

static inline void* ___va(unsigned long p)

{

        unsigned long v;

        asm volatile ("1: addis %0, %1, %2;"

                      ".section \".ptov_fixup\",\"aw\";"

                      ".align  1;"

                      ".long   1b;"

                      ".previous;"

                      : "=r" (v)

                      : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));

        return (void*) v;

}

#else

#define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET)

#define ___va(paddr) ((paddr)+PPC_MEMOFFSET)

#endif

#define __pa(x) ___pa((unsigned long)(x))

#define __va(x) ((void *)(___va((unsigned long)(x))))

#define MAP_PAGE_RESERVED       (1<<15)

#define virt_to_page(kaddr)     (mem_map + (((unsigned long)(kaddr)-PAGE_OFFSET) >> PAGE_SHIFT))

#define VALID_PAGE(page)        (((page) - mem_map) < max_mapnr)

extern unsigned long get_zero_page_fast(void);

/* Pure 2^n version of get_order */

extern __inline__ int get_order(unsigned long size)

{

        int order;

        size = (size-1) >> (PAGE_SHIFT-1);

        order = -1;

        do {

                size >>= 1;

                order++;

        } while (size);

        return order;

}

#endif /* __ASSEMBLY__ */

#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \

                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#endif /* __KERNEL__ */

#endif /* _PPC_PAGE_H */