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

   1/*
   2 * OpenRISC Linux
   3 *
   4 * Linux architectural port borrowing liberally from similar works of
   5 * others.  All original copyrights apply as per the original source
   6 * declaration.
   7 *
   8 * OpenRISC implementation:
   9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  11 * et al.
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation; either version 2 of the License, or
  16 * (at your option) any later version.
  17 */
  18
  19#ifndef __ASM_OPENRISC_PAGE_H
  20#define __ASM_OPENRISC_PAGE_H
  21
  22
  23/* PAGE_SHIFT determines the page size */
  24
  25#define PAGE_SHIFT      13
  26#ifdef __ASSEMBLY__
  27#define PAGE_SIZE       (1 << PAGE_SHIFT)
  28#else
  29#define PAGE_SIZE       (1UL << PAGE_SHIFT)
  30#endif
  31#define PAGE_MASK       (~(PAGE_SIZE-1))
  32
  33#define PAGE_OFFSET     0xc0000000
  34#define KERNELBASE      PAGE_OFFSET
  35
  36/* This is not necessarily the right place for this, but it's needed by
  37 * drivers/of/fdt.c
  38 */
  39#include <asm/setup.h>
  40
  41#ifndef __ASSEMBLY__
  42
  43#define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  44#define free_user_page(page, addr)      free_page(addr)
  45
  46#define clear_page(page)        memset((page), 0, PAGE_SIZE)
  47#define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
  48
  49#define clear_user_page(page, vaddr, pg)        clear_page(page)
  50#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  51
  52/*
  53 * These are used to make use of C type-checking..
  54 */
  55typedef struct {
  56        unsigned long pte;
  57} pte_t;
  58typedef struct {
  59        unsigned long pgd;
  60} pgd_t;
  61typedef struct {
  62        unsigned long pgprot;
  63} pgprot_t;
  64typedef struct page *pgtable_t;
  65
  66#define pte_val(x)      ((x).pte)
  67#define pgd_val(x)      ((x).pgd)
  68#define pgprot_val(x)   ((x).pgprot)
  69
  70#define __pte(x)        ((pte_t) { (x) })
  71#define __pgd(x)        ((pgd_t) { (x) })
  72#define __pgprot(x)     ((pgprot_t) { (x) })
  73
  74#endif /* !__ASSEMBLY__ */
  75
  76
  77#ifndef __ASSEMBLY__
  78
  79#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
  80#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
  81
  82#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  83#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  84
  85#define virt_to_page(addr) \
  86        (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
  87#define page_to_virt(page) \
  88        ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  89
  90#define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
  91
  92#define pfn_valid(pfn)          ((pfn) < max_mapnr)
  93
  94#define virt_addr_valid(kaddr)  (pfn_valid(virt_to_pfn(kaddr)))
  95
  96#endif /* __ASSEMBLY__ */
  97
  98
  99#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 100                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 101
 102
 103#include <asm-generic/memory_model.h>
 104#include <asm-generic/getorder.h>
 105
 106#endif /* __ASM_OPENRISC_PAGE_H */
 107