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
  49 extern unsigned long shm_align_mask;
  50 extern unsigned long max_low_pfn, min_low_pfn;
  51 extern unsigned long memory_start, memory_end;
  52
  53 static inline unsigned long
  54 pages_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)
  61 extern void copy_page(void *to, void *from);
  62
  63 struct page;
  64 struct vm_area_struct;
  65
  66 extern 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
  69 extern 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
  76 typedef struct { unsigned long pte_low, pte_high; } pte_t;
  77 typedef struct { unsigned long long pgprot; } pgprot_t;
  78 typedef 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)
  84 typedef struct { unsigned long pte_low; } pte_t;
  85 typedef struct { unsigned long pgprot; } pgprot_t;
  86 typedef struct { unsigned long pgd; } pgd_t;
  87 #define pte_val(x)      ((x).pte_low)
  88 #define __pte(x)        ((pte_t) { (x) } )
  89 #else
  90 typedef struct { unsigned long long pte_low; } pte_t;
  91 typedef struct { unsigned long pgprot; } pgprot_t;
  92 typedef 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
 103 typedef 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 */