LXR linux/include/asm-sh64/page.h

   1#ifndef __ASM_SH64_PAGE_H
   2#define __ASM_SH64_PAGE_H
   3
   4/*
   5 * This file is subject to the terms and conditions of the GNU General Public
   6 * License.  See the file "COPYING" in the main directory of this archive
   7 * for more details.
   8 *
   9 * include/asm-sh64/page.h
  10 *
  11 * Copyright (C) 2000, 2001  Paolo Alberelli
  12 * Copyright (C) 2003, 2004  Paul Mundt
  13 *
  14 * benedict.gaster@superh.com 19th, 24th July 2002.
  15 *
  16 * Modified to take account of enabling for D-CACHE support.
  17 *
  18 */
  19
  20#include <linux/config.h>
  21
  22/* PAGE_SHIFT determines the page size */
  23#define PAGE_SHIFT      12
  24#ifdef __ASSEMBLY__
  25#define PAGE_SIZE       4096
  26#else
  27#define PAGE_SIZE       (1UL << PAGE_SHIFT)
  28#endif
  29#define PAGE_MASK       (~(PAGE_SIZE-1))
  30#define PTE_MASK        PAGE_MASK
  31
  32#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  33#define HPAGE_SHIFT     16
  34#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  35#define HPAGE_SHIFT     20
  36#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
  37#define HPAGE_SHIFT     29
  38#endif
  39
  40#ifdef CONFIG_HUGETLB_PAGE
  41#define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  42#define HPAGE_MASK              (~(HPAGE_SIZE-1))
  43#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  44#endif
  45
  46#ifdef __KERNEL__
  47#ifndef __ASSEMBLY__
  48
  49extern struct page *mem_map;
  50extern void sh64_page_clear(void *page);
  51extern void sh64_page_copy(void *from, void *to);
  52
  53#define clear_page(page)               sh64_page_clear(page)
  54#define copy_page(to,from)             sh64_page_copy(from, to)
  55
  56#if defined(CONFIG_DCACHE_DISABLED)
  57
  58#define clear_user_page(page, vaddr, pg)        clear_page(page)
  59#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  60
  61#else
  62
  63extern void clear_user_page(void *to, unsigned long address, struct page *pg);
  64extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
  65
  66#endif /* defined(CONFIG_DCACHE_DISABLED) */
  67
  68/*
  69 * These are used to make use of C type-checking..
  70 */
  71typedef struct { unsigned long long pte; } pte_t;
  72typedef struct { unsigned long pmd; } pmd_t;
  73typedef struct { unsigned long pgd; } pgd_t;
  74typedef struct { unsigned long pgprot; } pgprot_t;
  75
  76#define pte_val(x)      ((x).pte)
  77#define pmd_val(x)      ((x).pmd)
  78#define pgd_val(x)      ((x).pgd)
  79#define pgprot_val(x)   ((x).pgprot)
  80
  81#define __pte(x) ((pte_t) { (x) } )
  82#define __pmd(x) ((pmd_t) { (x) } )
  83#define __pgd(x) ((pgd_t) { (x) } )
  84#define __pgprot(x)     ((pgprot_t) { (x) } )
  85
  86#endif /* !__ASSEMBLY__ */
  87
  88/* to align the pointer to the (next) page boundary */
  89#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  90
  91/*
  92 * Kconfig defined.
  93 */
  94#define __MEMORY_START          (CONFIG_MEMORY_START)
  95#define PAGE_OFFSET             (CONFIG_CACHED_MEMORY_OFFSET)
  96
  97#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
  98#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
  99#define MAP_NR(addr)            ((__pa(addr)-__MEMORY_START) >> PAGE_SHIFT)
 100#define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)
 101
 102#define phys_to_page(phys)      (mem_map + (((phys) - __MEMORY_START) >> PAGE_SHIFT))
 103#define page_to_phys(page)      (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
 104
 105/* PFN start number, because of __MEMORY_START */
 106#define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 107
 108#define pfn_to_page(pfn)        (mem_map + (pfn) - PFN_START)
 109#define page_to_pfn(page)       ((unsigned long)((page) - mem_map) + PFN_START)
 110#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 111#define pfn_valid(pfn)          (((pfn) - PFN_START) < max_mapnr)
 112#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 113
 114#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 115                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 116
 117#ifndef __ASSEMBLY__
 118
 119/* Pure 2^n version of get_order */
 120extern __inline__ int get_order(unsigned long size)
 121{
 122        int order;
 123
 124        size = (size-1) >> (PAGE_SHIFT-1);
 125        order = -1;
 126        do {
 127                size >>= 1;
 128                order++;
 129        } while (size);
 130        return order;
 131}
 132
 133#endif
 134
 135#endif /* __KERNEL__ */
 136
 137#endif /* __ASM_SH64_PAGE_H */
 138