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page.h

#ifndef _ASM_M32R_PAGE_H
#define _ASM_M32R_PAGE_H

#include <linux/const.h>

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT      12
#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))

#ifndef __ASSEMBLY__

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

#define clear_user_page(page, vaddr, pg)  clear_page(page)
#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)

#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
      alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

/*
 * 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;
#define pte_val(x)      ((x).pte)
#define PTE_MASK  PAGE_MASK

typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct page *pgtable_t;

#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__ */

/*
 * This handles the memory map.. We could make this a config
 * option, but too many people screw it up, and too few need
 * it.
 *
 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
 * a virtual address space of one gigabyte, which limits the
 * amount of physical memory you can use to about 950MB.
 *
 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
 * and CONFIG_HIGHMEM64G options in the kernel configuration.
 */

#define __MEMORY_START  CONFIG_MEMORY_START
#define __MEMORY_SIZE   CONFIG_MEMORY_SIZE

#ifdef CONFIG_MMU
#define __PAGE_OFFSET  (0x80000000)
#else
#define __PAGE_OFFSET  (0x00000000)
#endif

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

#ifndef CONFIG_DISCONTIGMEM
#define PFN_BASE        (CONFIG_MEMORY_START >> PAGE_SHIFT)
#define ARCH_PFN_OFFSET       PFN_BASE
#define pfn_valid(pfn)        (((pfn) - PFN_BASE) < max_mapnr)
#endif  /* !CONFIG_DISCONTIGMEM */

#define virt_to_page(kaddr)   pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define virt_addr_valid(kaddr)      pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
                         VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC )

#define devmem_is_allowed(x) 1

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* _ASM_M32R_PAGE_H */

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