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#include <asm/uncached.h>
  49
  50extern unsigned long shm_align_mask;
  51extern unsigned long max_low_pfn, min_low_pfn;
  52extern unsigned long memory_start, memory_end, memory_limit;
  53
  54static inline unsigned long
  55pages_do_alias(unsigned long addr1, unsigned long addr2)
  56{
  57        return (addr1 ^ addr2) & shm_align_mask;
  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 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#ifdef CONFIG_PMB
 131#define ___pa(x)        ((x)-PAGE_OFFSET+__MEMORY_START)
 132#define ___va(x)        ((x)+PAGE_OFFSET-__MEMORY_START)
 133#else
 134#define ___pa(x)        ((x)-PAGE_OFFSET)
 135#define ___va(x)        ((x)+PAGE_OFFSET)
 136#endif
 137
 138#ifndef __ASSEMBLY__
 139#define __pa(x)         ___pa((unsigned long)x)
 140#define __va(x)         (void *)___va((unsigned long)x)
 141#endif /* !__ASSEMBLY__ */
 142
 143#ifdef CONFIG_UNCACHED_MAPPING
 144#define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + uncached_start)
 145#define CAC_ADDR(addr)          ((addr) - uncached_start + PAGE_OFFSET)
 146#else
 147#define UNCAC_ADDR(addr)        ((addr))
 148#define CAC_ADDR(addr)          ((addr))
 149#endif
 150
 151#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 152#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 153
 154/*
 155 * PFN = physical frame number (ie PFN 0 == physical address 0)
 156 * PFN_START is the PFN of the first page of RAM. By defining this we
 157 * don't have struct page entries for the portion of address space
 158 * between physical address 0 and the start of RAM.
 159 */
 160#define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 161#define ARCH_PFN_OFFSET         (PFN_START)
 162#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 163#ifdef CONFIG_FLATMEM
 164#define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
 165#endif
 166#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 167
 168#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 169                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 170
 171#include <asm-generic/memory_model.h>
 172#include <asm-generic/getorder.h>
 173
 174/* vDSO support */
 175#ifdef CONFIG_VSYSCALL
 176#define __HAVE_ARCH_GATE_AREA
 177#endif
 178
 179/*
 180 * Some drivers need to perform DMA into kmalloc'ed buffers
 181 * and so we have to increase the kmalloc minalign for this.
 182 */
 183#define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
 184
 185#ifdef CONFIG_SUPERH64
 186/*
 187 * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
 188 * happily generate {ld/st}.q pairs, requiring us to have 8-byte
 189 * alignment to avoid traps. The kmalloc alignment is gauranteed by
 190 * virtue of L1_CACHE_BYTES, requiring this to only be special cased
 191 * for slab caches.
 192 */
 193#define ARCH_SLAB_MINALIGN      8
 194#endif
 195
 196#endif /* __ASM_SH_PAGE_H */
 197