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  */
  38 typedef struct { unsigned long pte; } pte_t;
  39 typedef struct { unsigned long pgd; } pgd_t;
  40 typedef struct { unsigned long pgprot; } pgprot_t;
  41 typedef 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 */
  77 static inline int get_order(unsigned long size) __attribute__((const));
  78 static 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 */