include/asm-sh/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_64KB)
  16 # define PAGE_SHIFT     16
  17 #else
  18 # error "Bogus kernel page size?"
  19 #endif
  20
  21 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  22 #define PAGE_MASK       (~(PAGE_SIZE-1))
  23 #define PTE_MASK        PAGE_MASK
  24
  25 /* to align the pointer to the (next) page boundary */
  26 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  27
  28 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  29 #define HPAGE_SHIFT     16
  30 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  31 #define HPAGE_SHIFT     18
  32 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  33 #define HPAGE_SHIFT     20
  34 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  35 #define HPAGE_SHIFT     22
  36 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
  37 #define HPAGE_SHIFT     26
  38 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
  39 #define HPAGE_SHIFT     29
  40 #endif
  41
  42 #ifdef CONFIG_HUGETLB_PAGE
  43 #define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  44 #define HPAGE_MASK              (~(HPAGE_SIZE-1))
  45 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  46 #endif
  47
  48 #ifndef __ASSEMBLY__
  49
  50 extern unsigned long shm_align_mask;
  51 extern unsigned long max_low_pfn, min_low_pfn;
  52 extern unsigned long memory_start, memory_end;
  53
  54 extern void clear_page(void *to);
  55 extern void copy_page(void *to, void *from);
  56
  57 #if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
  58         (defined(CONFIG_CPU_SH5) || defined(CONFIG_CPU_SH4) || \
  59          defined(CONFIG_SH7705_CACHE_32KB))
  60 struct page;
  61 struct vm_area_struct;
  62 extern void clear_user_page(void *to, unsigned long address, struct page *page);
  63 extern void copy_user_page(void *to, void *from, unsigned long address,
  64                            struct page *page);
  65 #if defined(CONFIG_CPU_SH4)
  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 #endif
  70 #else
  71 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  72 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  73 #endif
  74
  75 /*
  76  * These are used to make use of C type-checking..
  77  */
  78 #ifdef CONFIG_X2TLB
  79 typedef struct { unsigned long pte_low, pte_high; } pte_t;
  80 typedef struct { unsigned long long pgprot; } pgprot_t;
  81 typedef struct { unsigned long long pgd; } pgd_t;
  82 #define pte_val(x) \
  83         ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  84 #define __pte(x) \
  85         ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  86 #elif defined(CONFIG_SUPERH32)
  87 typedef struct { unsigned long pte_low; } pte_t;
  88 typedef struct { unsigned long pgprot; } pgprot_t;
  89 typedef struct { unsigned long pgd; } pgd_t;
  90 #define pte_val(x)      ((x).pte_low)
  91 #define __pte(x)        ((pte_t) { (x) } )
  92 #else
  93 typedef struct { unsigned long long pte_low; } pte_t;
  94 typedef struct { unsigned long pgprot; } pgprot_t;
  95 typedef struct { unsigned long pgd; } pgd_t;
  96 #define pte_val(x)      ((x).pte_low)
  97 #define __pte(x)        ((pte_t) { (x) } )
  98 #endif
  99
 100 #define pgd_val(x)      ((x).pgd)
 101 #define pgprot_val(x)   ((x).pgprot)
 102
 103 #define __pgd(x) ((pgd_t) { (x) } )
 104 #define __pgprot(x)     ((pgprot_t) { (x) } )
 105
 106 typedef struct page *pgtable_t;
 107
 108 #endif /* !__ASSEMBLY__ */
 109
 110 /*
 111  * __MEMORY_START and SIZE are the physical addresses and size of RAM.
 112  */
 113 #define __MEMORY_START          CONFIG_MEMORY_START
 114 #define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
 115
 116 /*
 117  * PAGE_OFFSET is the virtual address of the start of kernel address
 118  * space.
 119  */
 120 #define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 121
 122 /*
 123  * Virtual to physical RAM address translation.
 124  *
 125  * In 29 bit mode, the physical offset of RAM from address 0 is visible in
 126  * the kernel virtual address space, and thus we don't have to take
 127  * this into account when translating. However in 32 bit mode this offset
 128  * is not visible (it is part of the PMB mapping) and so needs to be
 129  * added or subtracted as required.
 130  */
 131 #ifdef CONFIG_32BIT
 132 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
 133 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
 134 #else
 135 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
 136 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
 137 #endif
 138
 139 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 140 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 141
 142 /*
 143  * PFN = physical frame number (ie PFN 0 == physical address 0)
 144  * PFN_START is the PFN of the first page of RAM. By defining this we
 145  * don't have struct page entries for the portion of address space
 146  * between physical address 0 and the start of RAM.
 147  */
 148 #define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 149 #define ARCH_PFN_OFFSET         (PFN_START)
 150 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 151 #ifdef CONFIG_FLATMEM
 152 #define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
 153 #endif
 154 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 155
 156 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 157                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 158
 159 #include <asm-generic/memory_model.h>
 160 #include <asm-generic/page.h>
 161
 162 /* vDSO support */
 163 #ifdef CONFIG_VSYSCALL
 164 #define __HAVE_ARCH_GATE_AREA
 165 #endif
 166
 167 /*
 168  * Some drivers need to perform DMA into kmalloc'ed buffers
 169  * and so we have to increase the kmalloc minalign for this.
 170  */
 171 #define ARCH_KMALLOC_MINALIGN   L1_CACHE_BYTES
 172
 173 #ifdef CONFIG_SUPERH64
 174 /*
 175  * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
 176  * happily generate {ld/st}.q pairs, requiring us to have 8-byte
 177  * alignment to avoid traps. The kmalloc alignment is gauranteed by
 178  * virtue of L1_CACHE_BYTES, requiring this to only be special cased
 179  * for slab caches.
 180  */
 181 #define ARCH_SLAB_MINALIGN      8
 182 #endif
 183
 184 #endif /* __ASM_SH_PAGE_H */