LXR linux-bk/include/asm-m68knommu/page.h

   1#ifndef _M68KNOMMU_PAGE_H
   2#define _M68KNOMMU_PAGE_H
   3
   4#include <linux/config.h>
   5
   6/* PAGE_SHIFT determines the page size */
   7
   8#define PAGE_SHIFT      (12)
   9#define PAGE_SIZE       (1UL << PAGE_SHIFT)
  10#define PAGE_MASK       (~(PAGE_SIZE-1))
  11
  12#ifdef __KERNEL__
  13
  14#include <asm/setup.h>
  15
  16#if !defined(CONFIG_SMALL_TASKS) && PAGE_SHIFT < 13
  17#define KTHREAD_SIZE (8192)
  18#else
  19#define KTHREAD_SIZE PAGE_SIZE
  20#endif
  21 
  22#ifndef __ASSEMBLY__
  23 
  24#define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  25#define free_user_page(page, addr)      free_page(addr)
  26
  27#define clear_page(page)        memset((page), 0, PAGE_SIZE)
  28#define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  29
  30#define clear_user_page(page, vaddr, pg)        clear_page(page)
  31#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  32
  33/*
  34 * These are used to make use of C type-checking..
  35 */
  36typedef struct { unsigned long pte; } pte_t;
  37typedef struct { unsigned long pmd[16]; } pmd_t;
  38typedef struct { unsigned long pgd; } pgd_t;
  39typedef struct { unsigned long pgprot; } pgprot_t;
  40
  41#define pte_val(x)      ((x).pte)
  42#define pmd_val(x)      ((&x)->pmd[0])
  43#define pgd_val(x)      ((x).pgd)
  44#define pgprot_val(x)   ((x).pgprot)
  45
  46#define __pte(x)        ((pte_t) { (x) } )
  47#define __pmd(x)        ((pmd_t) { (x) } )
  48#define __pgd(x)        ((pgd_t) { (x) } )
  49#define __pgprot(x)     ((pgprot_t) { (x) } )
  50
  51/* to align the pointer to the (next) page boundary */
  52#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  53
  54/* Pure 2^n version of get_order */
  55extern __inline__ int get_order(unsigned long size)
  56{
  57        int order;
  58
  59        size = (size-1) >> (PAGE_SHIFT-1);
  60        order = -1;
  61        do {
  62                size >>= 1;
  63                order++;
  64        } while (size);
  65        return order;
  66}
  67
  68extern unsigned long memory_start;
  69extern unsigned long memory_end;
  70
  71#endif /* !__ASSEMBLY__ */
  72
  73#include <asm/page_offset.h>
  74
  75#define PAGE_OFFSET             (PAGE_OFFSET_RAW)
  76
  77#ifndef __ASSEMBLY__
  78
  79#define __pa(vaddr)             virt_to_phys((void *)vaddr)
  80#define __va(paddr)             phys_to_virt((unsigned long)paddr)
  81
  82#define MAP_NR(addr)            (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
  83
  84#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  85#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  86
  87#define virt_to_page(addr)      (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
  88#define page_to_virt(page)      ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  89#define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)
  90
  91#define pfn_to_page(pfn)        virt_to_page(pfn_to_virt(pfn))
  92#define page_to_pfn(page)       virt_to_pfn(page_to_virt(page))
  93
  94#define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
  95                                ((void *)(kaddr) < (void *)memory_end))
  96
  97#endif /* __ASSEMBLY__ */
  98
  99#endif /* __KERNEL__ */
 100
 101#endif /* _M68KNOMMU_PAGE_H */
 102