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 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  26 #define HPAGE_SHIFT     16
  27 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  28 #define HPAGE_SHIFT     18
  29 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  30 #define HPAGE_SHIFT     20
  31 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  32 #define HPAGE_SHIFT     22
  33 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
  34 #define HPAGE_SHIFT     26
  35 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
  36 #define HPAGE_SHIFT     29
  37 #endif
  38
  39 #ifdef CONFIG_HUGETLB_PAGE
  40 #define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  41 #define HPAGE_MASK              (~(HPAGE_SIZE-1))
  42 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  43 #endif
  44
  45 #ifndef __ASSEMBLY__
  46
  47 extern unsigned long shm_align_mask;
  48 extern unsigned long max_low_pfn, min_low_pfn;
  49 extern unsigned long memory_start, memory_end;
  50
  51 extern void clear_page(void *to);
  52 extern void copy_page(void *to, void *from);
  53
  54 #if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
  55         (defined(CONFIG_CPU_SH5) || defined(CONFIG_CPU_SH4) || \
  56          defined(CONFIG_SH7705_CACHE_32KB))
  57 struct page;
  58 struct vm_area_struct;
  59 extern void clear_user_page(void *to, unsigned long address, struct page *page);
  60 extern void copy_user_page(void *to, void *from, unsigned long address,
  61                            struct page *page);
  62 #if defined(CONFIG_CPU_SH4)
  63 extern void copy_user_highpage(struct page *to, struct page *from,
  64                                unsigned long vaddr, struct vm_area_struct *vma);
  65 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  66 #endif
  67 #else
  68 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  69 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  70 #endif
  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 #endif /* !__ASSEMBLY__ */
 106
 107 /*
 108  * __MEMORY_START and SIZE are the physical addresses and size of RAM.
 109  */
 110 #define __MEMORY_START          CONFIG_MEMORY_START
 111 #define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
 112
 113 /*
 114  * PAGE_OFFSET is the virtual address of the start of kernel address
 115  * space.
 116  */
 117 #define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 118
 119 /*
 120  * Virtual to physical RAM address translation.
 121  *
 122  * In 29 bit mode, the physical offset of RAM from address 0 is visible in
 123  * the kernel virtual address space, and thus we don't have to take
 124  * this into account when translating. However in 32 bit mode this offset
 125  * is not visible (it is part of the PMB mapping) and so needs to be
 126  * added or subtracted as required.
 127  */
 128 #ifdef CONFIG_32BIT
 129 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
 130 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
 131 #else
 132 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
 133 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
 134 #endif
 135
 136 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 137 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 138
 139 /*
 140  * PFN = physical frame number (ie PFN 0 == physical address 0)
 141  * PFN_START is the PFN of the first page of RAM. By defining this we
 142  * don't have struct page entries for the portion of address space
 143  * between physical address 0 and the start of RAM.
 144  */
 145 #define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 146 #define ARCH_PFN_OFFSET         (PFN_START)
 147 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 148 #ifdef CONFIG_FLATMEM
 149 #define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
 150 #endif
 151 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 152
 153 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 154                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 155
 156 #include <asm-generic/memory_model.h>
 157 #include <asm-generic/page.h>
 158
 159 /* vDSO support */
 160 #ifdef CONFIG_VSYSCALL
 161 #define __HAVE_ARCH_GATE_AREA
 162 #endif
 163
 164 /*
 165  * Some drivers need to perform DMA into kmalloc'ed buffers
 166  * and so we have to increase the kmalloc minalign for this.
 167  */
 168 #define ARCH_KMALLOC_MINALIGN   L1_CACHE_BYTES
 169
 170 #ifdef CONFIG_SUPERH64
 171 /*
 172  * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
 173  * happily generate {ld/st}.q pairs, requiring us to have 8-byte
 174  * alignment to avoid traps. The kmalloc alignment is gauranteed by
 175  * virtue of L1_CACHE_BYTES, requiring this to only be special cased
 176  * for slab caches.
 177  */
 178 #define ARCH_SLAB_MINALIGN      8
 179 #endif
 180
 181 #endif /* __ASM_SH_PAGE_H */