LXR linux/include/asm-avr32/page.h

   1/*
   2 * Copyright (C) 2004-2006 Atmel Corporation
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 */
   8#ifndef __ASM_AVR32_PAGE_H
   9#define __ASM_AVR32_PAGE_H
  10
  11#ifdef __KERNEL__
  12
  13/* PAGE_SHIFT determines the page size */
  14#define PAGE_SHIFT      12
  15#ifdef __ASSEMBLY__
  16#define PAGE_SIZE       (1 << PAGE_SHIFT)
  17#else
  18#define PAGE_SIZE       (1UL << PAGE_SHIFT)
  19#endif
  20#define PAGE_MASK       (~(PAGE_SIZE-1))
  21#define PTE_MASK        PAGE_MASK
  22
  23#ifndef __ASSEMBLY__
  24
  25#include <asm/addrspace.h>
  26
  27extern void clear_page(void *to);
  28extern void copy_page(void *to, void *from);
  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 pgd; } pgd_t;
  38typedef struct { unsigned long pgprot; } pgprot_t;
  39
  40#define pte_val(x)              ((x).pte)
  41#define pgd_val(x)              ((x).pgd)
  42#define pgprot_val(x)           ((x).pgprot)
  43
  44#define __pte(x)                ((pte_t) { (x) })
  45#define __pgd(x)                ((pgd_t) { (x) })
  46#define __pgprot(x)             ((pgprot_t) { (x) })
  47
  48/* FIXME: These should be removed soon */
  49extern unsigned long memory_start, memory_end;
  50
  51/* Pure 2^n version of get_order */
  52static inline int get_order(unsigned long size)
  53{
  54        unsigned lz;
  55
  56        size = (size - 1) >> PAGE_SHIFT;
  57        asm("clz %0, %1" : "=r"(lz) : "r"(size));
  58        return 32 - lz;
  59}
  60
  61#endif /* !__ASSEMBLY__ */
  62
  63/* Align the pointer to the (next) page boundary */
  64#define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  65
  66/*
  67 * The hardware maps the virtual addresses 0x80000000 -> 0x9fffffff
  68 * permanently to the physical addresses 0x00000000 -> 0x1fffffff when
  69 * segmentation is enabled. We want to make use of this in order to
  70 * minimize TLB pressure.
  71 */
  72#define PAGE_OFFSET             (0x80000000UL)
  73
  74/*
  75 * ALSA uses virt_to_page() on DMA pages, which I'm not entirely sure
  76 * is a good idea. Anyway, we can't simply subtract PAGE_OFFSET here
  77 * in that case, so we'll have to mask out the three most significant
  78 * bits of the address instead...
  79 *
  80 * What's the difference between __pa() and virt_to_phys() anyway?
  81 */
  82#define __pa(x)         PHYSADDR(x)
  83#define __va(x)         ((void *)(P1SEGADDR(x)))
  84
  85#define MAP_NR(addr)    (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
  86
  87#define phys_to_page(phys)      (pfn_to_page(phys >> PAGE_SHIFT))
  88#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
  89
  90#ifndef CONFIG_NEED_MULTIPLE_NODES
  91
  92#define PHYS_PFN_OFFSET         (CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
  93
  94#define pfn_to_page(pfn)        (mem_map + ((pfn) - PHYS_PFN_OFFSET))
  95#define page_to_pfn(page)       ((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET)
  96#define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
  97#endif /* CONFIG_NEED_MULTIPLE_NODES */
  98
  99#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 100#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 101
 102#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE |   \
 103                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 104
 105/*
 106 * Memory above this physical address will be considered highmem.
 107 */
 108#define HIGHMEM_START           0x20000000UL
 109
 110#endif /* __KERNEL__ */
 111
 112#endif /* __ASM_AVR32_PAGE_H */
 113