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#ifndef __ASM_SH_PAGE_H

#define __ASM_SH_PAGE_H

/*

 * Copyright (C) 1999  Niibe Yutaka

 */

/*

   [ P0/U0 (virtual) ]          0x00000000     <------ User space

   [ P1 (fixed)   cached ]      0x80000000     <------ Kernel space

   [ P2 (fixed)  non-cachable]  0xA0000000     <------ Physical access

   [ P3 (virtual) cached]       0xC0000000     <------ vmalloced area

   [ P4 control   ]             0xE0000000

 */

#include <linux/config.h>

/* PAGE_SHIFT determines the page size */

#define PAGE_SHIFT      12

#define PAGE_SIZE       (1UL << PAGE_SHIFT)

#define PAGE_MASK       (~(PAGE_SIZE-1))

#define PTE_MASK        PAGE_MASK

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

extern void clear_page(void *to);

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

#if defined(__sh3__)

#define clear_user_page(page, vaddr)    clear_page(page)

#define copy_user_page(to, from, vaddr) copy_page(to, from)

#elif defined(__SH4__)

extern void clear_user_page(void *to, unsigned long address);

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

extern void __clear_user_page(void *to, void *orig_to);

extern void __copy_user_page(void *to, void *from, void *orig_to);

#endif

/*

 * 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) } )

#endif /* !__ASSEMBLY__ */

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

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

/*

 * IF YOU CHANGE THIS, PLEASE ALSO CHANGE

 *

 *      arch/sh/vmlinux.lds.S

 *

 * which has the same constant encoded..

 */

#define __MEMORY_START          CONFIG_MEMORY_START

#define __MEMORY_SIZE           CONFIG_MEMORY_SIZE

#ifdef CONFIG_DISCONTIGMEM

/* Just for HP690, for now.. */

#define __MEMORY_START_2ND      (__MEMORY_START+0x02000000)

#define __MEMORY_SIZE_2ND       0x001000000 /* 16MB */

#endif

#define PAGE_OFFSET             (0x80000000UL)

#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)

#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))

#ifndef CONFIG_DISCONTIGMEM

#define phys_to_page(phys)      (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))

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

#define page_to_phys(page)      (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)

#endif

#define virt_to_page(kaddr)     phys_to_page(__pa(kaddr))

#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \

                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#ifndef __ASSEMBLY__

/*

 * Tell the user there is some problem.

 */

#define BUG() do { \

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

        asm volatile("nop"); \

} while (0)

#define PAGE_BUG(page) do { \

        BUG(); \

} while (0)

/* Pure 2^n version of get_order */

static __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

#endif /* __KERNEL__ */

#endif /* __ASM_SH_PAGE_H */