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 extern void clear_page(void *to);
  54 extern void copy_page(void *to, void *from);
  55
  56 #if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
  57         (defined(CONFIG_CPU_SH5) || defined(CONFIG_CPU_SH4) || \
  58          defined(CONFIG_SH7705_CACHE_32KB))
  59 struct page;
  60 struct vm_area_struct;
  61 extern void clear_user_page(void *to, unsigned long address, struct page *page);
  62 extern void copy_user_page(void *to, void *from, unsigned long address,
  63                            struct page *page);
  64 #if defined(CONFIG_CPU_SH4)
  65 extern void copy_user_highpage(struct page *to, struct page *from,
  66                                unsigned long vaddr, struct vm_area_struct *vma);
  67 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  68 #endif
  69 #else
  70 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  71 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  72 #endif
  73
  74 /*
  75  * These are used to make use of C type-checking..
  76  */
  77 #ifdef CONFIG_X2TLB
  78 typedef struct { unsigned long pte_low, pte_high; } pte_t;
  79 typedef struct { unsigned long long pgprot; } pgprot_t;
  80 typedef struct { unsigned long long pgd; } pgd_t;
  81 #define pte_val(x) \
  82         ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  83 #define __pte(x) \
  84         ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  85 #elif defined(CONFIG_SUPERH32)
  86 typedef struct { unsigned long pte_low; } pte_t;
  87 typedef struct { unsigned long pgprot; } pgprot_t;
  88 typedef struct { unsigned long pgd; } pgd_t;
  89 #define pte_val(x)      ((x).pte_low)
  90 #define __pte(x)        ((pte_t) { (x) } )
  91 #else
  92 typedef struct { unsigned long long pte_low; } pte_t;
  93 typedef struct { unsigned long pgprot; } pgprot_t;
  94 typedef struct { unsigned long pgd; } pgd_t;
  95 #define pte_val(x)      ((x).pte_low)
  96 #define __pte(x)        ((pte_t) { (x) } )
  97 #endif
  98
  99 #define pgd_val(x)      ((x).pgd)
 100 #define pgprot_val(x)   ((x).pgprot)
 101
 102 #define __pgd(x) ((pgd_t) { (x) } )
 103 #define __pgprot(x)     ((pgprot_t) { (x) } )
 104
 105 typedef struct page *pgtable_t;
 106
 107 #define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
 108
 109 #endif /* !__ASSEMBLY__ */
 110
 111 /*
 112  * __MEMORY_START and SIZE are the physical addresses and size of RAM.
 113  */
 114 #define __MEMORY_START          CONFIG_MEMORY_START
 115 #define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
 116
 117 /*
 118  * PAGE_OFFSET is the virtual address of the start of kernel address
 119  * space.
 120  */
 121 #define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 122
 123 /*
 124  * Virtual to physical RAM address translation.
 125  *
 126  * In 29 bit mode, the physical offset of RAM from address 0 is visible in
 127  * the kernel virtual address space, and thus we don't have to take
 128  * this into account when translating. However in 32 bit mode this offset
 129  * is not visible (it is part of the PMB mapping) and so needs to be
 130  * added or subtracted as required.
 131  */
 132 #if defined(CONFIG_PMB_FIXED)
 133 /* phys = virt - PAGE_OFFSET - (__MEMORY_START & 0xe0000000) */
 134 #define PMB_OFFSET      (PAGE_OFFSET - PXSEG(__MEMORY_START))
 135 #define __pa(x) ((unsigned long)(x) - PMB_OFFSET)
 136 #define __va(x) ((void *)((unsigned long)(x) + PMB_OFFSET))
 137 #elif defined(CONFIG_32BIT)
 138 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
 139 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
 140 #else
 141 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
 142 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
 143 #endif
 144
 145 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 146 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 147
 148 /*
 149  * PFN = physical frame number (ie PFN 0 == physical address 0)
 150  * PFN_START is the PFN of the first page of RAM. By defining this we
 151  * don't have struct page entries for the portion of address space
 152  * between physical address 0 and the start of RAM.
 153  */
 154 #define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 155 #define ARCH_PFN_OFFSET         (PFN_START)
 156 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 157 #ifdef CONFIG_FLATMEM
 158 #define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
 159 #endif
 160 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 161
 162 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 163                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 164
 165 #include <asm-generic/memory_model.h>
 166 #include <asm-generic/page.h>
 167
 168 /* vDSO support */
 169 #ifdef CONFIG_VSYSCALL
 170 #define __HAVE_ARCH_GATE_AREA
 171 #endif
 172
 173 /*
 174  * Some drivers need to perform DMA into kmalloc'ed buffers
 175  * and so we have to increase the kmalloc minalign for this.
 176  */
 177 #define ARCH_KMALLOC_MINALIGN   L1_CACHE_BYTES
 178
 179 #ifdef CONFIG_SUPERH64
 180 /*
 181  * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
 182  * happily generate {ld/st}.q pairs, requiring us to have 8-byte
 183  * alignment to avoid traps. The kmalloc alignment is gauranteed by
 184  * virtue of L1_CACHE_BYTES, requiring this to only be special cased
 185  * for slab caches.
 186  */
 187 #define ARCH_SLAB_MINALIGN      8
 188 #endif
 189
 190 #endif /* __ASM_SH_PAGE_H */