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

   1#ifndef _ASM_PAGE_H
   2#define _ASM_PAGE_H
   3
   4#ifdef __KERNEL__
   5
   6#include <linux/config.h>
   7#include <asm/virtconvert.h>
   8#include <asm/mem-layout.h>
   9#include <asm/sections.h>
  10#include <asm/setup.h>
  11
  12#ifndef __ASSEMBLY__
  13
  14#define get_user_page(vaddr)                    __get_free_page(GFP_KERNEL)
  15#define free_user_page(page, addr)              free_page(addr)
  16
  17#define clear_page(pgaddr)                      memset((pgaddr), 0, PAGE_SIZE)
  18#define copy_page(to,from)                      memcpy((to), (from), PAGE_SIZE)
  19
  20#define clear_user_page(pgaddr, vaddr, page)    memset((pgaddr), 0, PAGE_SIZE)
  21#define copy_user_page(vto, vfrom, vaddr, topg) memcpy((vto), (vfrom), PAGE_SIZE)
  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  ste[64];} pmd_t;
  28typedef struct { pmd_t          pue[1]; } pud_t;
  29typedef struct { pud_t          pge[1]; } pgd_t;
  30typedef struct { unsigned long  pgprot; } pgprot_t;
  31
  32#define pte_val(x)      ((x).pte)
  33#define pmd_val(x)      ((x).ste[0])
  34#define pud_val(x)      ((x).pue[0])
  35#define pgd_val(x)      ((x).pge[0])
  36#define pgprot_val(x)   ((x).pgprot)
  37
  38#define __pte(x)        ((pte_t) { (x) } )
  39#define __pmd(x)        ((pmd_t) { (x) } )
  40#define __pud(x)        ((pud_t) { (x) } )
  41#define __pgd(x)        ((pgd_t) { (x) } )
  42#define __pgprot(x)     ((pgprot_t) { (x) } )
  43#define PTE_MASK        PAGE_MASK
  44
  45/* to align the pointer to the (next) page boundary */
  46#define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  47
  48/* Pure 2^n version of get_order */
  49static inline int get_order(unsigned long size) __attribute_const__;
  50static inline int get_order(unsigned long size)
  51{
  52        int order;
  53
  54        size = (size - 1) >> (PAGE_SHIFT - 1);
  55        order = -1;
  56        do {
  57                size >>= 1;
  58                order++;
  59        } while (size);
  60        return order;
  61}
  62
  63#define devmem_is_allowed(pfn)  1
  64
  65#define __pa(vaddr)             virt_to_phys((void *) vaddr)
  66#define __va(paddr)             phys_to_virt((unsigned long) paddr)
  67
  68#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
  69
  70extern unsigned long max_low_pfn;
  71extern unsigned long min_low_pfn;
  72extern unsigned long max_pfn;
  73
  74#ifdef CONFIG_MMU
  75#define pfn_to_page(pfn)        (mem_map + (pfn))
  76#define page_to_pfn(page)       ((unsigned long) ((page) - mem_map))
  77#define pfn_valid(pfn)          ((pfn) < max_mapnr)
  78
  79#else
  80#define pfn_to_page(pfn)        (&mem_map[(pfn) - (PAGE_OFFSET >> PAGE_SHIFT)])
  81#define page_to_pfn(page)       ((PAGE_OFFSET >> PAGE_SHIFT) + (unsigned long) ((page) - mem_map))
  82#define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
  83
  84#endif
  85
  86#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  87#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  88
  89
  90#ifdef CONFIG_MMU
  91#define VM_DATA_DEFAULT_FLAGS \
  92        (VM_READ | VM_WRITE | \
  93        ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
  94                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  95#endif
  96
  97#endif /* __ASSEMBLY__ */
  98
  99#endif /* __KERNEL__ */
 100
 101#ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
 102#define WANT_PAGE_VIRTUAL       1
 103#endif
 104
 105#endif /* _ASM_PAGE_H */
 106