LXR linux/arch/mn10300/include/asm/page.h

   1/* MN10300 Page table definitions
   2 *
   3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public Licence
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the Licence, or (at your option) any later version.
  10 */
  11#ifndef _ASM_PAGE_H
  12#define _ASM_PAGE_H
  13
  14/* PAGE_SHIFT determines the page size */
  15#define PAGE_SHIFT      12
  16
  17#ifndef __ASSEMBLY__
  18#define PAGE_SIZE       (1UL << PAGE_SHIFT)
  19#define PAGE_MASK       (~(PAGE_SIZE - 1))
  20#else
  21#define PAGE_SIZE       +(1 << PAGE_SHIFT)      /* unary plus marks an
  22                                                 * immediate val not an addr */
  23#define PAGE_MASK       +(~(PAGE_SIZE - 1))
  24#endif
  25
  26#ifdef __KERNEL__
  27#ifndef __ASSEMBLY__
  28
  29#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  30#define copy_page(to, from)     memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  31
  32#define clear_user_page(addr, vaddr, page)      clear_page(addr)
  33#define copy_user_page(vto, vfrom, vaddr, to)   copy_page(vto, vfrom)
  34
  35/*
  36 * These are used to make use of C type-checking..
  37 */
  38typedef struct { unsigned long pte; } pte_t;
  39typedef struct { unsigned long pgd; } pgd_t;
  40typedef struct { unsigned long pgprot; } pgprot_t;
  41typedef struct page *pgtable_t;
  42
  43#define PTE_MASK        PAGE_MASK
  44#define HPAGE_SHIFT     22
  45
  46#ifdef CONFIG_HUGETLB_PAGE
  47#define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
  48#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  49#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  50#endif
  51
  52#define pte_val(x)      ((x).pte)
  53#define pgd_val(x)      ((x).pgd)
  54#define pgprot_val(x)   ((x).pgprot)
  55
  56#define __pte(x)        ((pte_t) { (x) })
  57#define __pgd(x)        ((pgd_t) { (x) })
  58#define __pgprot(x)     ((pgprot_t) { (x) })
  59
  60#include <asm-generic/pgtable-nopmd.h>
  61
  62#endif /* !__ASSEMBLY__ */
  63
  64/*
  65 * This handles the memory map.. We could make this a config
  66 * option, but too many people screw it up, and too few need
  67 * it.
  68 *
  69 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  70 * a virtual address space of one gigabyte, which limits the
  71 * amount of physical memory you can use to about 950MB.
  72 */
  73
  74#ifndef __ASSEMBLY__
  75
  76/* Pure 2^n version of get_order */
  77static inline int get_order(unsigned long size) __attribute__((const));
  78static inline int get_order(unsigned long size)
  79{
  80        int order;
  81
  82        size = (size - 1) >> (PAGE_SHIFT - 1);
  83        order = -1;
  84        do {
  85                size >>= 1;
  86                order++;
  87        } while (size);
  88        return order;
  89}
  90
  91#endif /* __ASSEMBLY__ */
  92
  93#include <asm/page_offset.h>
  94
  95#define __PAGE_OFFSET           (PAGE_OFFSET_RAW)
  96#define PAGE_OFFSET             ((unsigned long) __PAGE_OFFSET)
  97
  98/*
  99 * main RAM and kernel working space are coincident at 0x90000000, but to make
 100 * life more interesting, there's also an uncached virtual shadow at 0xb0000000
 101 * - these mappings are fixed in the MMU
 102 */
 103#define __pfn_disp              (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT)
 104
 105#define __pa(x)                 ((unsigned long)(x))
 106#define __va(x)                 ((void *)(unsigned long)(x))
 107#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 108#define pfn_to_page(pfn)        (mem_map + ((pfn) - __pfn_disp))
 109#define page_to_pfn(page)       ((unsigned long)((page) - mem_map) + __pfn_disp)
 110
 111#define pfn_valid(pfn)                                  \
 112({                                                      \
 113        unsigned long __pfn = (pfn) - __pfn_disp;       \
 114        __pfn < max_mapnr;                              \
 115})
 116
 117#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 118#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 119#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 120
 121#define VM_DATA_DEFAULT_FLAGS \
 122        (VM_READ | VM_WRITE | \
 123        ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
 124                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 125
 126#endif /* __KERNEL__ */
 127
 128#endif /* _ASM_PAGE_H */
 129