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#define __ARCH_USE_5LEVEL_HACK
  61#include <asm-generic/pgtable-nopmd.h>
  62
  63#endif /* !__ASSEMBLY__ */
  64
  65/*
  66 * This handles the memory map.. We could make this a config
  67 * option, but too many people screw it up, and too few need
  68 * it.
  69 *
  70 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  71 * a virtual address space of one gigabyte, which limits the
  72 * amount of physical memory you can use to about 950MB.
  73 */
  74
  75#ifndef __ASSEMBLY__
  76
  77/* Pure 2^n version of get_order */
  78static inline int get_order(unsigned long size) __attribute__((const));
  79static inline int get_order(unsigned long size)
  80{
  81        int order;
  82
  83        size = (size - 1) >> (PAGE_SHIFT - 1);
  84        order = -1;
  85        do {
  86                size >>= 1;
  87                order++;
  88        } while (size);
  89        return order;
  90}
  91
  92#endif /* __ASSEMBLY__ */
  93
  94#include <asm/page_offset.h>
  95
  96#define __PAGE_OFFSET           (PAGE_OFFSET_RAW)
  97#define PAGE_OFFSET             ((unsigned long) __PAGE_OFFSET)
  98
  99/*
 100 * main RAM and kernel working space are coincident at 0x90000000, but to make
 101 * life more interesting, there's also an uncached virtual shadow at 0xb0000000
 102 * - these mappings are fixed in the MMU
 103 */
 104#define __pfn_disp              (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT)
 105
 106#define __pa(x)                 ((unsigned long)(x))
 107#define __va(x)                 ((void *)(unsigned long)(x))
 108#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 109#define pfn_to_page(pfn)        (mem_map + ((pfn) - __pfn_disp))
 110#define page_to_pfn(page)       ((unsigned long)((page) - mem_map) + __pfn_disp)
 111#define __pfn_to_phys(pfn)      PFN_PHYS(pfn)
 112
 113#define pfn_valid(pfn)                                  \
 114({                                                      \
 115        unsigned long __pfn = (pfn) - __pfn_disp;       \
 116        __pfn < max_mapnr;                              \
 117})
 118
 119#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 120#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 121#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 122
 123#define VM_DATA_DEFAULT_FLAGS \
 124        (VM_READ | VM_WRITE | \
 125        ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
 126                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 127
 128#endif /* __KERNEL__ */
 129
 130#endif /* _ASM_PAGE_H */
 131