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  */
  55 typedef struct {
  56         unsigned long pte;
  57 } pte_t;
  58 typedef struct {
  59         unsigned long pgd;
  60 } pgd_t;
  61 typedef struct {
  62         unsigned long pgprot;
  63 } pgprot_t;
  64 typedef 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 extern unsigned long memory_start;
  75 extern unsigned long memory_end;
  76
  77 #endif /* !__ASSEMBLY__ */
  78
  79
  80 #ifndef __ASSEMBLY__
  81
  82 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
  83 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
  84
  85 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  86 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  87
  88 #define virt_to_page(addr) \
  89         (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
  90 #define page_to_virt(page) \
  91         ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  92
  93 #define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
  94
  95 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  96
  97 #define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
  98                                 ((void *)(kaddr) < (void *)memory_end))
  99
 100 #endif /* __ASSEMBLY__ */
 101
 102
 103 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 104                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 105
 106
 107 #include <asm-generic/memory_model.h>
 108 #include <asm-generic/getorder.h>
 109
 110 #endif /* __ASM_OPENRISC_PAGE_H */