LXR linux/arch/m32r/include/asm/page.h

   1#ifndef _ASM_M32R_PAGE_H
   2#define _ASM_M32R_PAGE_H
   3
   4#include <linux/const.h>
   5
   6/* PAGE_SHIFT determines the page size */
   7#define PAGE_SHIFT      12
   8#define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
   9#define PAGE_MASK       (~(PAGE_SIZE-1))
  10
  11#ifndef __ASSEMBLY__
  12
  13extern void clear_page(void *to);
  14extern void copy_page(void *to, void *from);
  15
  16#define clear_user_page(page, vaddr, pg)        clear_page(page)
  17#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  18
  19#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  20        alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  21#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  22
  23/*
  24 * These are used to make use of C type-checking..
  25 */
  26typedef struct { unsigned long pte; } pte_t;
  27typedef struct { unsigned long pmd; } pmd_t;
  28typedef struct { unsigned long pgd; } pgd_t;
  29#define pte_val(x)      ((x).pte)
  30#define PTE_MASK        PAGE_MASK
  31
  32typedef struct { unsigned long pgprot; } pgprot_t;
  33typedef struct page *pgtable_t;
  34
  35#define pmd_val(x)      ((x).pmd)
  36#define pgd_val(x)      ((x).pgd)
  37#define pgprot_val(x)   ((x).pgprot)
  38
  39#define __pte(x) ((pte_t) { (x) } )
  40#define __pmd(x) ((pmd_t) { (x) } )
  41#define __pgd(x) ((pgd_t) { (x) } )
  42#define __pgprot(x)     ((pgprot_t) { (x) } )
  43
  44#endif /* !__ASSEMBLY__ */
  45
  46/*
  47 * This handles the memory map.. We could make this a config
  48 * option, but too many people screw it up, and too few need
  49 * it.
  50 *
  51 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  52 * a virtual address space of one gigabyte, which limits the
  53 * amount of physical memory you can use to about 950MB.
  54 *
  55 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  56 * and CONFIG_HIGHMEM64G options in the kernel configuration.
  57 */
  58
  59#define __MEMORY_START  CONFIG_MEMORY_START
  60#define __MEMORY_SIZE   CONFIG_MEMORY_SIZE
  61
  62#ifdef CONFIG_MMU
  63#define __PAGE_OFFSET  (0x80000000)
  64#else
  65#define __PAGE_OFFSET  (0x00000000)
  66#endif
  67
  68#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  69#define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
  70#define __va(x)                 ((void *)((unsigned long)(x) + PAGE_OFFSET))
  71
  72#ifndef CONFIG_DISCONTIGMEM
  73#define PFN_BASE                (CONFIG_MEMORY_START >> PAGE_SHIFT)
  74#define ARCH_PFN_OFFSET         PFN_BASE
  75#define pfn_valid(pfn)          (((pfn) - PFN_BASE) < max_mapnr)
  76#endif  /* !CONFIG_DISCONTIGMEM */
  77
  78#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  79#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  80
  81#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  82                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC )
  83
  84#define devmem_is_allowed(x) 1
  85
  86#include <asm-generic/memory_model.h>
  87#include <asm-generic/getorder.h>
  88
  89#endif /* _ASM_M32R_PAGE_H */
  90