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
  49 extern struct page *mem_map;
  50 extern void sh64_page_clear(void *page);
  51 extern 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
  63 extern void clear_user_page(void *to, unsigned long address, struct page *pg);
  64 extern 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  */
  71 typedef struct { unsigned long long pte; } pte_t;
  72 typedef struct { unsigned long pmd; } pmd_t;
  73 typedef struct { unsigned long pgd; } pgd_t;
  74 typedef 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 */
 120 extern __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 */