LXR linux/include/asm-ia64/page.h

   1#ifndef _ASM_IA64_PAGE_H
   2#define _ASM_IA64_PAGE_H
   3/*
   4 * Pagetable related stuff.
   5 *
   6 * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
   7 *      David Mosberger-Tang <davidm@hpl.hp.com>
   8 */
   9
  10#include <linux/config.h>
  11
  12#include <asm/intrinsics.h>
  13#include <asm/types.h>
  14
  15/*
  16 * PAGE_SHIFT determines the actual kernel page size.
  17 */
  18#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
  19# define PAGE_SHIFT     12
  20#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
  21# define PAGE_SHIFT     13
  22#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
  23# define PAGE_SHIFT     14
  24#elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
  25# define PAGE_SHIFT     16
  26#else
  27# error Unsupported page size!
  28#endif
  29
  30#define PAGE_SIZE               (__IA64_UL_CONST(1) << PAGE_SHIFT)
  31#define PAGE_MASK               (~(PAGE_SIZE - 1))
  32#define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  33
  34#define PERCPU_PAGE_SHIFT       16      /* log2() of max. size of per-CPU area */
  35#define PERCPU_PAGE_SIZE        (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
  36
  37#define RGN_MAP_LIMIT   ((1UL << (4*PAGE_SHIFT - 12)) - PAGE_SIZE)      /* per region addr limit */
  38
  39#ifdef CONFIG_HUGETLB_PAGE
  40# define REGION_HPAGE           (4UL)   /* note: this is hardcoded in reload_context()!*/
  41# define REGION_SHIFT           61
  42# define HPAGE_REGION_BASE      (REGION_HPAGE << REGION_SHIFT)
  43# define HPAGE_SHIFT            hpage_shift
  44# define HPAGE_SHIFT_DEFAULT    28      /* check ia64 SDM for architecture supported size */
  45# define HPAGE_SIZE             (__IA64_UL_CONST(1) << HPAGE_SHIFT)
  46# define HPAGE_MASK             (~(HPAGE_SIZE - 1))
  47
  48# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  49# define ARCH_HAS_HUGEPAGE_ONLY_RANGE
  50#endif /* CONFIG_HUGETLB_PAGE */
  51
  52#ifdef __ASSEMBLY__
  53# define __pa(x)                ((x) - PAGE_OFFSET)
  54# define __va(x)                ((x) + PAGE_OFFSET)
  55#else /* !__ASSEMBLY */
  56# ifdef __KERNEL__
  57#  define STRICT_MM_TYPECHECKS
  58
  59extern void clear_page (void *page);
  60extern void copy_page (void *to, void *from);
  61
  62/*
  63 * clear_user_page() and copy_user_page() can't be inline functions because
  64 * flush_dcache_page() can't be defined until later...
  65 */
  66#define clear_user_page(addr, vaddr, page)      \
  67do {                                            \
  68        clear_page(addr);                       \
  69        flush_dcache_page(page);                \
  70} while (0)
  71
  72#define copy_user_page(to, from, vaddr, page)   \
  73do {                                            \
  74        copy_page((to), (from));                \
  75        flush_dcache_page(page);                \
  76} while (0)
  77
  78
  79#define alloc_zeroed_user_highpage(vma, vaddr) \
  80({                                              \
  81        struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \
  82        if (page)                               \
  83                flush_dcache_page(page);        \
  84        page;                                   \
  85})
  86
  87#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  88
  89#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  90
  91#ifdef CONFIG_VIRTUAL_MEM_MAP
  92extern int ia64_pfn_valid (unsigned long pfn);
  93#else
  94# define ia64_pfn_valid(pfn) 1
  95#endif
  96
  97#ifndef CONFIG_DISCONTIGMEM
  98# define pfn_valid(pfn)         (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
  99# define page_to_pfn(page)      ((unsigned long) (page - mem_map))
 100# define pfn_to_page(pfn)       (mem_map + (pfn))
 101#else
 102extern struct page *vmem_map;
 103extern unsigned long max_low_pfn;
 104# define pfn_valid(pfn)         (((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
 105# define page_to_pfn(page)      ((unsigned long) (page - vmem_map))
 106# define pfn_to_page(pfn)       (vmem_map + (pfn))
 107#endif
 108
 109#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 110#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 111
 112typedef union ia64_va {
 113        struct {
 114                unsigned long off : 61;         /* intra-region offset */
 115                unsigned long reg :  3;         /* region number */
 116        } f;
 117        unsigned long l;
 118        void *p;
 119} ia64_va;
 120
 121/*
 122 * Note: These macros depend on the fact that PAGE_OFFSET has all
 123 * region bits set to 1 and all other bits set to zero.  They are
 124 * expressed in this way to ensure they result in a single "dep"
 125 * instruction.
 126 */
 127#define __pa(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
 128#define __va(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
 129
 130#define REGION_NUMBER(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
 131#define REGION_OFFSET(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
 132
 133#define REGION_SIZE             REGION_NUMBER(1)
 134#define REGION_KERNEL           7
 135
 136#ifdef CONFIG_HUGETLB_PAGE
 137# define htlbpage_to_page(x)    (((unsigned long) REGION_NUMBER(x) << 61)                       \
 138                                 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
 139# define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT - PAGE_SHIFT)
 140# define is_hugepage_only_range(addr, len)              \
 141         (REGION_NUMBER(addr) == REGION_HPAGE &&        \
 142          REGION_NUMBER((addr)+(len)) == REGION_HPAGE)
 143extern unsigned int hpage_shift;
 144#endif
 145
 146static __inline__ int
 147get_order (unsigned long size)
 148{
 149        long double d = size - 1;
 150        long order;
 151
 152        order = ia64_getf_exp(d);
 153        order = order - PAGE_SHIFT - 0xffff + 1;
 154        if (order < 0)
 155                order = 0;
 156        return order;
 157}
 158
 159# endif /* __KERNEL__ */
 160#endif /* !__ASSEMBLY__ */
 161
 162#ifdef STRICT_MM_TYPECHECKS
 163  /*
 164   * These are used to make use of C type-checking..
 165   */
 166  typedef struct { unsigned long pte; } pte_t;
 167  typedef struct { unsigned long pmd; } pmd_t;
 168  typedef struct { unsigned long pgd; } pgd_t;
 169  typedef struct { unsigned long pgprot; } pgprot_t;
 170
 171# define pte_val(x)     ((x).pte)
 172# define pmd_val(x)     ((x).pmd)
 173# define pgd_val(x)     ((x).pgd)
 174# define pgprot_val(x)  ((x).pgprot)
 175
 176# define __pte(x)       ((pte_t) { (x) } )
 177# define __pgprot(x)    ((pgprot_t) { (x) } )
 178
 179#else /* !STRICT_MM_TYPECHECKS */
 180  /*
 181   * .. while these make it easier on the compiler
 182   */
 183# ifndef __ASSEMBLY__
 184    typedef unsigned long pte_t;
 185    typedef unsigned long pmd_t;
 186    typedef unsigned long pgd_t;
 187    typedef unsigned long pgprot_t;
 188# endif
 189
 190# define pte_val(x)     (x)
 191# define pmd_val(x)     (x)
 192# define pgd_val(x)     (x)
 193# define pgprot_val(x)  (x)
 194
 195# define __pte(x)       (x)
 196# define __pgd(x)       (x)
 197# define __pgprot(x)    (x)
 198#endif /* !STRICT_MM_TYPECHECKS */
 199
 200#define PAGE_OFFSET                     __IA64_UL_CONST(0xe000000000000000)
 201
 202#define VM_DATA_DEFAULT_FLAGS           (VM_READ | VM_WRITE |                                   \
 203                                         VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |                \
 204                                         (((current->personality & READ_IMPLIES_EXEC) != 0)     \
 205                                          ? VM_EXEC : 0))
 206
 207#endif /* _ASM_IA64_PAGE_H */
 208