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

   1#ifndef __ASM_SH_PAGE_H
   2#define __ASM_SH_PAGE_H
   3
   4/*
   5 * Copyright (C) 1999  Niibe Yutaka
   6 */
   7
   8#include <linux/const.h>
   9
  10/* PAGE_SHIFT determines the page size */
  11#if defined(CONFIG_PAGE_SIZE_4KB)
  12# define PAGE_SHIFT     12
  13#elif defined(CONFIG_PAGE_SIZE_8KB)
  14# define PAGE_SHIFT     13
  15#elif defined(CONFIG_PAGE_SIZE_16KB)
  16# define PAGE_SHIFT     14
  17#elif defined(CONFIG_PAGE_SIZE_64KB)
  18# define PAGE_SHIFT     16
  19#else
  20# error "Bogus kernel page size?"
  21#endif
  22
  23#define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  24#define PAGE_MASK       (~(PAGE_SIZE-1))
  25#define PTE_MASK        PAGE_MASK
  26
  27#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  28#define HPAGE_SHIFT     16
  29#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  30#define HPAGE_SHIFT     18
  31#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  32#define HPAGE_SHIFT     20
  33#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  34#define HPAGE_SHIFT     22
  35#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
  36#define HPAGE_SHIFT     26
  37#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
  38#define HPAGE_SHIFT     29
  39#endif
  40
  41#ifdef CONFIG_HUGETLB_PAGE
  42#define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  43#define HPAGE_MASK              (~(HPAGE_SIZE-1))
  44#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  45#endif
  46
  47#ifndef __ASSEMBLY__
  48
  49extern unsigned long shm_align_mask;
  50extern unsigned long max_low_pfn, min_low_pfn;
  51extern unsigned long memory_start, memory_end;
  52
  53static inline unsigned long
  54pages_do_alias(unsigned long addr1, unsigned long addr2)
  55{
  56        return (addr1 ^ addr2) & shm_align_mask;
  57}
  58
  59
  60#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  61extern void copy_page(void *to, void *from);
  62
  63struct page;
  64struct vm_area_struct;
  65
  66extern void copy_user_highpage(struct page *to, struct page *from,
  67                               unsigned long vaddr, struct vm_area_struct *vma);
  68#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  69extern void clear_user_highpage(struct page *page, unsigned long vaddr);
  70#define clear_user_highpage     clear_user_highpage
  71
  72/*
  73 * These are used to make use of C type-checking..
  74 */
  75#ifdef CONFIG_X2TLB
  76typedef struct { unsigned long pte_low, pte_high; } pte_t;
  77typedef struct { unsigned long long pgprot; } pgprot_t;
  78typedef struct { unsigned long long pgd; } pgd_t;
  79#define pte_val(x) \
  80        ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  81#define __pte(x) \
  82        ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  83#elif defined(CONFIG_SUPERH32)
  84typedef struct { unsigned long pte_low; } pte_t;
  85typedef struct { unsigned long pgprot; } pgprot_t;
  86typedef struct { unsigned long pgd; } pgd_t;
  87#define pte_val(x)      ((x).pte_low)
  88#define __pte(x)        ((pte_t) { (x) } )
  89#else
  90typedef struct { unsigned long long pte_low; } pte_t;
  91typedef struct { unsigned long pgprot; } pgprot_t;
  92typedef struct { unsigned long pgd; } pgd_t;
  93#define pte_val(x)      ((x).pte_low)
  94#define __pte(x)        ((pte_t) { (x) } )
  95#endif
  96
  97#define pgd_val(x)      ((x).pgd)
  98#define pgprot_val(x)   ((x).pgprot)
  99
 100#define __pgd(x) ((pgd_t) { (x) } )
 101#define __pgprot(x)     ((pgprot_t) { (x) } )
 102
 103typedef struct page *pgtable_t;
 104
 105#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
 106
 107#endif /* !__ASSEMBLY__ */
 108
 109/*
 110 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
 111 */
 112#define __MEMORY_START          CONFIG_MEMORY_START
 113#define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
 114
 115/*
 116 * PAGE_OFFSET is the virtual address of the start of kernel address
 117 * space.
 118 */
 119#define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 120
 121/*
 122 * Virtual to physical RAM address translation.
 123 *
 124 * In 29 bit mode, the physical offset of RAM from address 0 is visible in
 125 * the kernel virtual address space, and thus we don't have to take
 126 * this into account when translating. However in 32 bit mode this offset
 127 * is not visible (it is part of the PMB mapping) and so needs to be
 128 * added or subtracted as required.
 129 */
 130#if defined(CONFIG_PMB_FIXED)
 131/* phys = virt - PAGE_OFFSET - (__MEMORY_START & 0xe0000000) */
 132#define PMB_OFFSET      (PAGE_OFFSET - PXSEG(__MEMORY_START))
 133#define __pa(x) ((unsigned long)(x) - PMB_OFFSET)
 134#define __va(x) ((void *)((unsigned long)(x) + PMB_OFFSET))
 135#elif defined(CONFIG_32BIT)
 136#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
 137#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
 138#else
 139#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
 140#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
 141#endif
 142
 143#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 144#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 145
 146/*
 147 * PFN = physical frame number (ie PFN 0 == physical address 0)
 148 * PFN_START is the PFN of the first page of RAM. By defining this we
 149 * don't have struct page entries for the portion of address space
 150 * between physical address 0 and the start of RAM.
 151 */
 152#define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 153#define ARCH_PFN_OFFSET         (PFN_START)
 154#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 155#ifdef CONFIG_FLATMEM
 156#define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
 157#endif
 158#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 159
 160#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 161                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 162
 163#include <asm-generic/memory_model.h>
 164#include <asm-generic/getorder.h>
 165
 166/* vDSO support */
 167#ifdef CONFIG_VSYSCALL
 168#define __HAVE_ARCH_GATE_AREA
 169#endif
 170
 171/*
 172 * Some drivers need to perform DMA into kmalloc'ed buffers
 173 * and so we have to increase the kmalloc minalign for this.
 174 */
 175#define ARCH_KMALLOC_MINALIGN   L1_CACHE_BYTES
 176
 177#ifdef CONFIG_SUPERH64
 178/*
 179 * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
 180 * happily generate {ld/st}.q pairs, requiring us to have 8-byte
 181 * alignment to avoid traps. The kmalloc alignment is gauranteed by
 182 * virtue of L1_CACHE_BYTES, requiring this to only be special cased
 183 * for slab caches.
 184 */
 185#define ARCH_SLAB_MINALIGN      8
 186#endif
 187
 188#endif /* __ASM_SH_PAGE_H */
 189