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

   1#ifndef _ASM_M32R_PAGE_H
   2#define _ASM_M32R_PAGE_H
   3
   4#include <linux/config.h>
   5
   6/* PAGE_SHIFT determines the page size */
   7#define PAGE_SHIFT      12
   8#define PAGE_SIZE       (1UL << PAGE_SHIFT)
   9#define PAGE_MASK       (~(PAGE_SIZE-1))
  10
  11#ifdef __KERNEL__
  12#ifndef __ASSEMBLY__
  13
  14extern void clear_page(void *to);
  15extern void copy_page(void *to, void *from);
  16
  17#define clear_user_page(page, vaddr, pg)        clear_page(page)
  18#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  19
  20#define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, 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;
  33
  34#define pmd_val(x)      ((x).pmd)
  35#define pgd_val(x)      ((x).pgd)
  36#define pgprot_val(x)   ((x).pgprot)
  37
  38#define __pte(x) ((pte_t) { (x) } )
  39#define __pmd(x) ((pmd_t) { (x) } )
  40#define __pgd(x) ((pgd_t) { (x) } )
  41#define __pgprot(x)     ((pgprot_t) { (x) } )
  42
  43#endif /* !__ASSEMBLY__ */
  44
  45/* to align the pointer to the (next) page boundary */
  46#define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  47
  48/*
  49 * This handles the memory map.. We could make this a config
  50 * option, but too many people screw it up, and too few need
  51 * it.
  52 *
  53 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  54 * a virtual address space of one gigabyte, which limits the
  55 * amount of physical memory you can use to about 950MB.
  56 *
  57 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  58 * and CONFIG_HIGHMEM64G options in the kernel configuration.
  59 */
  60
  61
  62/* This handles the memory map.. */
  63
  64#ifndef __ASSEMBLY__
  65
  66/* Pure 2^n version of get_order */
  67static __inline__ int get_order(unsigned long size)
  68{
  69        int order;
  70
  71        size = (size - 1) >> (PAGE_SHIFT - 1);
  72        order = -1;
  73        do {
  74                size >>= 1;
  75                order++;
  76        } while (size);
  77
  78        return order;
  79}
  80
  81#endif /* __ASSEMBLY__ */
  82
  83#define __MEMORY_START  CONFIG_MEMORY_START
  84#define __MEMORY_SIZE   CONFIG_MEMORY_SIZE
  85
  86#ifdef CONFIG_MMU
  87#define __PAGE_OFFSET  (0x80000000)
  88#else
  89#define __PAGE_OFFSET  (0x00000000)
  90#endif
  91
  92#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  93#define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
  94#define __va(x)                 ((void *)((unsigned long)(x) + PAGE_OFFSET))
  95
  96#ifndef CONFIG_DISCONTIGMEM
  97#define PFN_BASE                (CONFIG_MEMORY_START >> PAGE_SHIFT)
  98#define pfn_to_page(pfn)        (mem_map + ((pfn) - PFN_BASE))
  99#define page_to_pfn(page)       \
 100        ((unsigned long)((page) - mem_map) + PFN_BASE)
 101#define pfn_valid(pfn)          (((pfn) - PFN_BASE) < max_mapnr)
 102#endif  /* !CONFIG_DISCONTIGMEM */
 103
 104#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 105#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 106
 107#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 108                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC )
 109
 110#define devmem_is_allowed(x) 1
 111
 112#endif /* __KERNEL__ */
 113
 114#endif /* _ASM_M32R_PAGE_H */
 115
 116