LXR linux/arch/parisc/include/asm/page.h

   1#ifndef _PARISC_PAGE_H
   2#define _PARISC_PAGE_H
   3
   4#include <linux/const.h>
   5
   6#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
   7# define PAGE_SHIFT     12
   8#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
   9# define PAGE_SHIFT     14
  10#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
  11# define PAGE_SHIFT     16
  12#else
  13# error "unknown default kernel page size"
  14#endif
  15#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  16#define PAGE_MASK       (~(PAGE_SIZE-1))
  17
  18
  19#ifndef __ASSEMBLY__
  20
  21#include <asm/types.h>
  22#include <asm/cache.h>
  23
  24#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  25#define copy_page(to,from)      copy_user_page_asm((void *)(to), (void *)(from))
  26
  27struct page;
  28
  29void copy_user_page_asm(void *to, void *from);
  30void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  31                           struct page *pg);
  32void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
  33
  34/*
  35 * These are used to make use of C type-checking..
  36 */
  37#define STRICT_MM_TYPECHECKS
  38#ifdef STRICT_MM_TYPECHECKS
  39typedef struct { unsigned long pte;
  40#if !defined(CONFIG_64BIT)
  41                 unsigned long future_flags;
  42 /* XXX: it's possible to remove future_flags and change BITS_PER_PTE_ENTRY
  43         to 2, but then strangely the identical 32bit kernel boots on a
  44         c3000(pa20), but not any longer on a 715(pa11).
  45         Still investigating... HelgeD.
  46  */
  47#endif
  48} pte_t; /* either 32 or 64bit */
  49
  50/* NOTE: even on 64 bits, these entries are __u32 because we allocate
  51 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  52typedef struct { __u32 pmd; } pmd_t;
  53typedef struct { __u32 pgd; } pgd_t;
  54typedef struct { unsigned long pgprot; } pgprot_t;
  55
  56#define pte_val(x)      ((x).pte)
  57/* These do not work lvalues, so make sure we don't use them as such. */
  58#define pmd_val(x)      ((x).pmd + 0)
  59#define pgd_val(x)      ((x).pgd + 0)
  60#define pgprot_val(x)   ((x).pgprot)
  61
  62#define __pte(x)        ((pte_t) { (x) } )
  63#define __pmd(x)        ((pmd_t) { (x) } )
  64#define __pgd(x)        ((pgd_t) { (x) } )
  65#define __pgprot(x)     ((pgprot_t) { (x) } )
  66
  67#define __pmd_val_set(x,n) (x).pmd = (n)
  68#define __pgd_val_set(x,n) (x).pgd = (n)
  69
  70#else
  71/*
  72 * .. while these make it easier on the compiler
  73 */
  74typedef unsigned long pte_t;
  75typedef         __u32 pmd_t;
  76typedef         __u32 pgd_t;
  77typedef unsigned long pgprot_t;
  78
  79#define pte_val(x)      (x)
  80#define pmd_val(x)      (x)
  81#define pgd_val(x)      (x)
  82#define pgprot_val(x)   (x)
  83
  84#define __pte(x)        (x)
  85#define __pmd(x)        (x)
  86#define __pgd(x)        (x)
  87#define __pgprot(x)     (x)
  88
  89#define __pmd_val_set(x,n) (x) = (n)
  90#define __pgd_val_set(x,n) (x) = (n)
  91
  92#endif /* STRICT_MM_TYPECHECKS */
  93
  94typedef struct page *pgtable_t;
  95
  96typedef struct __physmem_range {
  97        unsigned long start_pfn;
  98        unsigned long pages;       /* PAGE_SIZE pages */
  99} physmem_range_t;
 100
 101extern physmem_range_t pmem_ranges[];
 102extern int npmem_ranges;
 103
 104#endif /* !__ASSEMBLY__ */
 105
 106/* WARNING: The definitions below must match exactly to sizeof(pte_t)
 107 * etc
 108 */
 109#ifdef CONFIG_64BIT
 110#define BITS_PER_PTE_ENTRY      3
 111#define BITS_PER_PMD_ENTRY      2
 112#define BITS_PER_PGD_ENTRY      2
 113#else
 114#define BITS_PER_PTE_ENTRY      3
 115#define BITS_PER_PMD_ENTRY      2
 116#define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 117#endif
 118#define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 119#define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 120#define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 121
 122#define LINUX_GATEWAY_SPACE     0
 123
 124/* This governs the relationship between virtual and physical addresses.
 125 * If you alter it, make sure to take care of our various fixed mapping
 126 * segments in fixmap.h */
 127#ifdef CONFIG_64BIT
 128#define __PAGE_OFFSET   (0x40000000)    /* 1GB */
 129#else
 130#define __PAGE_OFFSET   (0x10000000)    /* 256MB */
 131#endif
 132
 133#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 134
 135/* The size of the gateway page (we leave lots of room for expansion) */
 136#define GATEWAY_PAGE_SIZE       0x4000
 137
 138/* The start of the actual kernel binary---used in vmlinux.lds.S
 139 * Leave some space after __PAGE_OFFSET for detecting kernel null
 140 * ptr derefs */
 141#define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 142
 143/* These macros don't work for 64-bit C code -- don't allow in C at all */
 144#ifdef __ASSEMBLY__
 145#   define PA(x)        ((x)-__PAGE_OFFSET)
 146#   define VA(x)        ((x)+__PAGE_OFFSET)
 147#endif
 148#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 149#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 150
 151#ifndef CONFIG_DISCONTIGMEM
 152#define pfn_valid(pfn)          ((pfn) < max_mapnr)
 153#endif /* CONFIG_DISCONTIGMEM */
 154
 155#ifdef CONFIG_HUGETLB_PAGE
 156#define HPAGE_SHIFT             22      /* 4MB (is this fixed?) */
 157#define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 158#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 159#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 160#endif
 161
 162#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 163
 164#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 165#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 166
 167#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 168                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 169
 170#include <asm-generic/memory_model.h>
 171#include <asm-generic/page.h>
 172
 173#endif /* _PARISC_PAGE_H */
 174