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

   1#ifndef _ASM_SCORE_PAGE_H
   2#define _ASM_SCORE_PAGE_H
   3
   4#include <linux/pfn.h>
   5#include <linux/const.h>
   6
   7/* PAGE_SHIFT determines the page size */
   8#define PAGE_SHIFT      (12)
   9#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  10#define PAGE_MASK       (~(PAGE_SIZE-1))
  11
  12#ifdef __KERNEL__
  13
  14#ifndef __ASSEMBLY__
  15
  16#define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
  17#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
  18
  19/* align addr on a size boundary - adjust address up/down if needed */
  20#define _ALIGN_UP(addr, size)   (((addr)+((size)-1))&(~((size)-1)))
  21#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
  22
  23/* align addr on a size boundary - adjust address up if needed */
  24#define _ALIGN(addr, size)      _ALIGN_UP(addr, size)
  25
  26/*
  27 * PAGE_OFFSET -- the first address of the first page of memory. When not
  28 * using MMU this corresponds to the first free page in physical memory (aligned
  29 * on a page boundary).
  30 */
  31#define PAGE_OFFSET             (0xA0000000UL)
  32
  33#define clear_page(pgaddr)                      memset((pgaddr), 0, PAGE_SIZE)
  34#define copy_page(to, from)                     memcpy((to), (from), PAGE_SIZE)
  35
  36#define clear_user_page(pgaddr, vaddr, page)    memset((pgaddr), 0, PAGE_SIZE)
  37#define copy_user_page(vto, vfrom, vaddr, topg) \
  38                        memcpy((vto), (vfrom), PAGE_SIZE)
  39
  40/*
  41 * These are used to make use of C type-checking..
  42 */
  43
  44typedef struct { unsigned long pte; } pte_t;            /* page table entry */
  45typedef struct { unsigned long pgd; } pgd_t;            /* PGD table entry */
  46typedef struct { unsigned long pgprot; } pgprot_t;
  47typedef struct page *pgtable_t;
  48
  49#define pte_val(x)      ((x).pte)
  50#define pgd_val(x)      ((x).pgd)
  51#define pgprot_val(x)   ((x).pgprot)
  52
  53#define __pte(x)        ((pte_t) { (x) })
  54#define __pgd(x)        ((pgd_t) { (x) })
  55#define __pgprot(x)     ((pgprot_t) { (x) })
  56
  57extern unsigned long max_low_pfn;
  58extern unsigned long min_low_pfn;
  59extern unsigned long max_pfn;
  60
  61#define __pa(x)         ((unsigned long)(x) - PAGE_OFFSET)
  62#define __va(x)         ((void *)((unsigned long) (x) + PAGE_OFFSET))
  63
  64#define phys_to_pfn(phys)       (PFN_DOWN(phys))
  65#define pfn_to_phys(pfn)        (PFN_PHYS(pfn))
  66
  67#define virt_to_pfn(vaddr)      (phys_to_pfn((__pa(vaddr))))
  68#define pfn_to_virt(pfn)        __va(pfn_to_phys((pfn)))
  69
  70#define virt_to_page(vaddr)     (pfn_to_page(virt_to_pfn(vaddr)))
  71#define page_to_virt(page)      (pfn_to_virt(page_to_pfn(page)))
  72
  73#define page_to_phys(page)      (pfn_to_phys(page_to_pfn(page)))
  74#define page_to_bus(page)       (page_to_phys(page))
  75#define phys_to_page(paddr)     (pfn_to_page(phys_to_pfn(paddr)))
  76
  77#define pfn_valid(pfn)          (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn))
  78
  79#define ARCH_PFN_OFFSET         (PAGE_OFFSET >> PAGE_SHIFT)
  80
  81#endif /* __ASSEMBLY__ */
  82
  83#define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
  84
  85#endif /* __KERNEL__ */
  86
  87#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  88                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  89
  90#include <asm-generic/memory_model.h>
  91#include <asm-generic/getorder.h>
  92
  93#endif /* _ASM_SCORE_PAGE_H */
  94