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
  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, memory_limit;
  53
  54 static inline unsigned long
  55 pages_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)
  61 extern void copy_page(void *to, void *from);
  62 #define copy_user_page(to, from, vaddr, pg)  __copy_user(to, from, PAGE_SIZE)
  63
  64 struct page;
  65 struct vm_area_struct;
  66
  67 extern void copy_user_highpage(struct page *to, struct page *from,
  68                                unsigned long vaddr, struct vm_area_struct *vma);
  69 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  70 extern void clear_user_highpage(struct page *page, unsigned long vaddr);
  71 #define clear_user_highpage     clear_user_highpage
  72
  73 /*
  74  * These are used to make use of C type-checking..
  75  */
  76 #ifdef CONFIG_X2TLB
  77 typedef struct { unsigned long pte_low, pte_high; } pte_t;
  78 typedef struct { unsigned long long pgprot; } pgprot_t;
  79 typedef struct { unsigned long long pgd; } pgd_t;
  80 #define pte_val(x) \
  81         ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  82 #define __pte(x) \
  83         ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  84 #elif defined(CONFIG_SUPERH32)
  85 typedef struct { unsigned long pte_low; } pte_t;
  86 typedef struct { unsigned long pgprot; } pgprot_t;
  87 typedef struct { unsigned long pgd; } pgd_t;
  88 #define pte_val(x)      ((x).pte_low)
  89 #define __pte(x)        ((pte_t) { (x) } )
  90 #else
  91 typedef struct { unsigned long long pte_low; } pte_t;
  92 typedef struct { unsigned long long pgprot; } pgprot_t;
  93 typedef struct { unsigned long pgd; } pgd_t;
  94 #define pte_val(x)      ((x).pte_low)
  95 #define __pte(x)        ((pte_t) { (x) } )
  96 #endif
  97
  98 #define pgd_val(x)      ((x).pgd)
  99 #define pgprot_val(x)   ((x).pgprot)
 100
 101 #define __pgd(x) ((pgd_t) { (x) } )
 102 #define __pgprot(x)     ((pgprot_t) { (x) } )
 103
 104 typedef struct page *pgtable_t;
 105
 106 #define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
 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  * PHYSICAL_OFFSET is the offset in physical memory where the base
 118  * of the kernel is loaded.
 119  */
 120 #ifdef CONFIG_PHYSICAL_START
 121 #define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
 122 #else
 123 #define PHYSICAL_OFFSET 0
 124 #endif
 125
 126 /*
 127  * PAGE_OFFSET is the virtual address of the start of kernel address
 128  * space.
 129  */
 130 #define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 131
 132 /*
 133  * Virtual to physical RAM address translation.
 134  *
 135  * In 29 bit mode, the physical offset of RAM from address 0 is visible in
 136  * the kernel virtual address space, and thus we don't have to take
 137  * this into account when translating. However in 32 bit mode this offset
 138  * is not visible (it is part of the PMB mapping) and so needs to be
 139  * added or subtracted as required.
 140  */
 141 #ifdef CONFIG_PMB
 142 #define ___pa(x)        ((x)-PAGE_OFFSET+__MEMORY_START)
 143 #define ___va(x)        ((x)+PAGE_OFFSET-__MEMORY_START)
 144 #else
 145 #define ___pa(x)        ((x)-PAGE_OFFSET)
 146 #define ___va(x)        ((x)+PAGE_OFFSET)
 147 #endif
 148
 149 #ifndef __ASSEMBLY__
 150 #define __pa(x)         ___pa((unsigned long)x)
 151 #define __va(x)         (void *)___va((unsigned long)x)
 152 #endif /* !__ASSEMBLY__ */
 153
 154 #ifdef CONFIG_UNCACHED_MAPPING
 155 #if defined(CONFIG_29BIT)
 156 #define UNCAC_ADDR(addr)        P2SEGADDR(addr)
 157 #define CAC_ADDR(addr)          P1SEGADDR(addr)
 158 #else
 159 #define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + uncached_start)
 160 #define CAC_ADDR(addr)          ((addr) - uncached_start + PAGE_OFFSET)
 161 #endif
 162 #else
 163 #define UNCAC_ADDR(addr)        ((addr))
 164 #define CAC_ADDR(addr)          ((addr))
 165 #endif
 166
 167 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 168 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 169
 170 /*
 171  * PFN = physical frame number (ie PFN 0 == physical address 0)
 172  * PFN_START is the PFN of the first page of RAM. By defining this we
 173  * don't have struct page entries for the portion of address space
 174  * between physical address 0 and the start of RAM.
 175  */
 176 #define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 177 #define ARCH_PFN_OFFSET         (PFN_START)
 178 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 179 #ifdef CONFIG_FLATMEM
 180 #define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
 181 #endif
 182 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 183
 184 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 185                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 186
 187 #include <asm-generic/memory_model.h>
 188 #include <asm-generic/getorder.h>
 189
 190 /*
 191  * Some drivers need to perform DMA into kmalloc'ed buffers
 192  * and so we have to increase the kmalloc minalign for this.
 193  */
 194 #define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
 195
 196 #ifdef CONFIG_SUPERH64
 197 /*
 198  * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
 199  * happily generate {ld/st}.q pairs, requiring us to have 8-byte
 200  * alignment to avoid traps. The kmalloc alignment is guaranteed by
 201  * virtue of L1_CACHE_BYTES, requiring this to only be special cased
 202  * for slab caches.
 203  */
 204 #define ARCH_SLAB_MINALIGN      8
 205 #endif
 206
 207 #endif /* __ASM_SH_PAGE_H */