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page.h

#ifndef _ASM_IA64_PAGE_H
#define _ASM_IA64_PAGE_H
/*
 * Pagetable related stuff.
 *
 * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
 *    David Mosberger-Tang <davidm@hpl.hp.com>
 */

#include <asm/intrinsics.h>
#include <asm/types.h>

/*
 * The top three bits of an IA64 address are its Region Number.
 * Different regions are assigned to different purposes.
 */
#define RGN_SHIFT (61)
#define RGN_BASE(r)     (__IA64_UL_CONST(r)<<RGN_SHIFT)
#define RGN_BITS  (RGN_BASE(-1))

#define RGN_KERNEL      7     /* Identity mapped region */
#define RGN_UNCACHED    6     /* Identity mapped I/O region */
#define RGN_GATE  5     /* Gate page, Kernel text, etc */
#define RGN_HPAGE 4     /* For Huge TLB pages */

/*
 * PAGE_SHIFT determines the actual kernel page size.
 */
#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
# define PAGE_SHIFT     12
#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
# define PAGE_SHIFT     13
#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
# define PAGE_SHIFT     14
#elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
# define PAGE_SHIFT     16
#else
# error Unsupported page size!
#endif

#define PAGE_SIZE       (__IA64_UL_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK       (~(PAGE_SIZE - 1))

#define PERCPU_PAGE_SHIFT     16    /* log2() of max. size of per-CPU area */
#define PERCPU_PAGE_SIZE      (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)


#ifdef CONFIG_HUGETLB_PAGE
# define HPAGE_REGION_BASE    RGN_BASE(RGN_HPAGE)
# define HPAGE_SHIFT          hpage_shift
# define HPAGE_SHIFT_DEFAULT  28    /* check ia64 SDM for architecture supported size */
# define HPAGE_SIZE           (__IA64_UL_CONST(1) << HPAGE_SHIFT)
# define HPAGE_MASK           (~(HPAGE_SIZE - 1))

# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#endif /* CONFIG_HUGETLB_PAGE */

#ifdef __ASSEMBLY__
# define __pa(x)        ((x) - PAGE_OFFSET)
# define __va(x)        ((x) + PAGE_OFFSET)
#else /* !__ASSEMBLY */
#  define STRICT_MM_TYPECHECKS

extern void clear_page (void *page);
extern void copy_page (void *to, void *from);

/*
 * clear_user_page() and copy_user_page() can't be inline functions because
 * flush_dcache_page() can't be defined until later...
 */
#define clear_user_page(addr, vaddr, page)      \
do {                                \
      clear_page(addr);             \
      flush_dcache_page(page);            \
} while (0)

#define copy_user_page(to, from, vaddr, page)   \
do {                                \
      copy_page((to), (from));            \
      flush_dcache_page(page);            \
} while (0)


#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr)          \
({                                                    \
      struct page *page = alloc_page_vma(                   \
            GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr);      \
      if (page)                                       \
            flush_dcache_page(page);                        \
      page;                                           \
})

#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

#define virt_addr_valid(kaddr)      pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#ifdef CONFIG_VIRTUAL_MEM_MAP
extern int ia64_pfn_valid (unsigned long pfn);
#else
# define ia64_pfn_valid(pfn) 1
#endif

#ifdef CONFIG_VIRTUAL_MEM_MAP
extern struct page *vmem_map;
#ifdef CONFIG_DISCONTIGMEM
# define page_to_pfn(page)    ((unsigned long) (page - vmem_map))
# define pfn_to_page(pfn)     (vmem_map + (pfn))
#else
# include <asm-generic/memory_model.h>
#endif
#else
# include <asm-generic/memory_model.h>
#endif

#ifdef CONFIG_FLATMEM
# define pfn_valid(pfn)       (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
#elif defined(CONFIG_DISCONTIGMEM)
extern unsigned long min_low_pfn;
extern unsigned long max_low_pfn;
# define pfn_valid(pfn)       (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
#endif

#define page_to_phys(page)    (page_to_pfn(page) << PAGE_SHIFT)
#define virt_to_page(kaddr)   pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_kaddr(pfn)     __va((pfn) << PAGE_SHIFT)

00127 typedef union ia64_va {
      struct {
            unsigned long off : 61;       /* intra-region offset */
            unsigned long reg :  3;       /* region number */
      } f;
      unsigned long l;
      void *p;
} ia64_va;

/*
 * Note: These macros depend on the fact that PAGE_OFFSET has all
 * region bits set to 1 and all other bits set to zero.  They are
 * expressed in this way to ensure they result in a single "dep"
 * instruction.
 */
#define __pa(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
#define __va(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})

#define REGION_NUMBER(x)      ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
#define REGION_OFFSET(x)      ({ia64_va _v; _v.l = (long) (x); _v.f.off;})

#ifdef CONFIG_HUGETLB_PAGE
# define htlbpage_to_page(x)  (((unsigned long) REGION_NUMBER(x) << 61)             \
                         | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
# define HUGETLB_PAGE_ORDER   (HPAGE_SHIFT - PAGE_SHIFT)
extern unsigned int hpage_shift;
#endif

static __inline__ int
get_order (unsigned long size)
{
      long double d = size - 1;
      long order;

      order = ia64_getf_exp(d);
      order = order - PAGE_SHIFT - 0xffff + 1;
      if (order < 0)
            order = 0;
      return order;
}

#endif /* !__ASSEMBLY__ */

#ifdef STRICT_MM_TYPECHECKS
  /*
   * These are used to make use of C type-checking..
   */
  typedef struct { unsigned long pte; } pte_t;
  typedef struct { unsigned long pmd; } pmd_t;
#ifdef CONFIG_PGTABLE_4
  typedef struct { unsigned long pud; } pud_t;
#endif
  typedef struct { unsigned long pgd; } pgd_t;
  typedef struct { unsigned long pgprot; } pgprot_t;
  typedef struct page *pgtable_t;

# define pte_val(x)     ((x).pte)
# define pmd_val(x)     ((x).pmd)
#ifdef CONFIG_PGTABLE_4
# define pud_val(x)     ((x).pud)
#endif
# define pgd_val(x)     ((x).pgd)
# define pgprot_val(x)  ((x).pgprot)

# define __pte(x) ((pte_t) { (x) } )
# define __pgprot(x)    ((pgprot_t) { (x) } )

#else /* !STRICT_MM_TYPECHECKS */
  /*
   * .. while these make it easier on the compiler
   */
# ifndef __ASSEMBLY__
    typedef unsigned long pte_t;
    typedef unsigned long pmd_t;
    typedef unsigned long pgd_t;
    typedef unsigned long pgprot_t;
    typedef struct page *pgtable_t;
# endif

# define pte_val(x)     (x)
# define pmd_val(x)     (x)
# define pgd_val(x)     (x)
# define pgprot_val(x)  (x)

# define __pte(x) (x)
# define __pgd(x) (x)
# define __pgprot(x)    (x)
#endif /* !STRICT_MM_TYPECHECKS */

#define PAGE_OFFSET                 RGN_BASE(RGN_KERNEL)

#define VM_DATA_DEFAULT_FLAGS       (VM_READ | VM_WRITE |                           \
                               VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |        \
                               (((current->personality & READ_IMPLIES_EXEC) != 0)   \
                                ? VM_EXEC : 0))

#endif /* _ASM_IA64_PAGE_H */

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