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

   1#ifndef _PARISC_PAGE_H
   2#define _PARISC_PAGE_H
   3
   4#ifdef __KERNEL__
   5
   6#include <linux/const.h>
   7
   8#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
   9# define PAGE_SHIFT     12
  10#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
  11# define PAGE_SHIFT     14
  12#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
  13# define PAGE_SHIFT     16
  14#else
  15# error "unknown default kernel page size"
  16#endif
  17#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  18#define PAGE_MASK       (~(PAGE_SIZE-1))
  19
  20
  21#ifndef __ASSEMBLY__
  22
  23#include <asm/types.h>
  24#include <asm/cache.h>
  25
  26#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  27#define copy_page(to,from)      copy_user_page_asm((void *)(to), (void *)(from))
  28
  29struct page;
  30
  31void copy_user_page_asm(void *to, void *from);
  32void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  33                           struct page *pg);
  34void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
  35
  36/*
  37 * These are used to make use of C type-checking..
  38 */
  39#define STRICT_MM_TYPECHECKS
  40#ifdef STRICT_MM_TYPECHECKS
  41typedef struct { unsigned long pte;
  42#if !defined(CONFIG_64BIT)
  43                 unsigned long future_flags;
  44 /* XXX: it's possible to remove future_flags and change BITS_PER_PTE_ENTRY
  45         to 2, but then strangely the identical 32bit kernel boots on a
  46         c3000(pa20), but not any longer on a 715(pa11).
  47         Still investigating... HelgeD.
  48  */
  49#endif
  50} pte_t; /* either 32 or 64bit */
  51
  52/* NOTE: even on 64 bits, these entries are __u32 because we allocate
  53 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  54typedef struct { __u32 pmd; } pmd_t;
  55typedef struct { __u32 pgd; } pgd_t;
  56typedef struct { unsigned long pgprot; } pgprot_t;
  57
  58#define pte_val(x)      ((x).pte)
  59/* These do not work lvalues, so make sure we don't use them as such. */
  60#define pmd_val(x)      ((x).pmd + 0)
  61#define pgd_val(x)      ((x).pgd + 0)
  62#define pgprot_val(x)   ((x).pgprot)
  63
  64#define __pte(x)        ((pte_t) { (x) } )
  65#define __pmd(x)        ((pmd_t) { (x) } )
  66#define __pgd(x)        ((pgd_t) { (x) } )
  67#define __pgprot(x)     ((pgprot_t) { (x) } )
  68
  69#define __pmd_val_set(x,n) (x).pmd = (n)
  70#define __pgd_val_set(x,n) (x).pgd = (n)
  71
  72#else
  73/*
  74 * .. while these make it easier on the compiler
  75 */
  76typedef unsigned long pte_t;
  77typedef         __u32 pmd_t;
  78typedef         __u32 pgd_t;
  79typedef unsigned long pgprot_t;
  80
  81#define pte_val(x)      (x)
  82#define pmd_val(x)      (x)
  83#define pgd_val(x)      (x)
  84#define pgprot_val(x)   (x)
  85
  86#define __pte(x)        (x)
  87#define __pmd(x)        (x)
  88#define __pgd(x)        (x)
  89#define __pgprot(x)     (x)
  90
  91#define __pmd_val_set(x,n) (x) = (n)
  92#define __pgd_val_set(x,n) (x) = (n)
  93
  94#endif /* STRICT_MM_TYPECHECKS */
  95
  96
  97typedef struct __physmem_range {
  98        unsigned long start_pfn;
  99        unsigned long pages;       /* PAGE_SIZE pages */
 100} physmem_range_t;
 101
 102extern physmem_range_t pmem_ranges[];
 103extern int npmem_ranges;
 104
 105#endif /* !__ASSEMBLY__ */
 106
 107/* WARNING: The definitions below must match exactly to sizeof(pte_t)
 108 * etc
 109 */
 110#ifdef CONFIG_64BIT
 111#define BITS_PER_PTE_ENTRY      3
 112#define BITS_PER_PMD_ENTRY      2
 113#define BITS_PER_PGD_ENTRY      2
 114#else
 115#define BITS_PER_PTE_ENTRY      3
 116#define BITS_PER_PMD_ENTRY      2
 117#define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 118#endif
 119#define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 120#define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 121#define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 122
 123/* to align the pointer to the (next) page boundary */
 124#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 125
 126
 127#define LINUX_GATEWAY_SPACE     0
 128
 129/* This governs the relationship between virtual and physical addresses.
 130 * If you alter it, make sure to take care of our various fixed mapping
 131 * segments in fixmap.h */
 132#ifdef CONFIG_64BIT
 133#define __PAGE_OFFSET   (0x40000000)    /* 1GB */
 134#else
 135#define __PAGE_OFFSET   (0x10000000)    /* 256MB */
 136#endif
 137
 138#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 139
 140/* The size of the gateway page (we leave lots of room for expansion) */
 141#define GATEWAY_PAGE_SIZE       0x4000
 142
 143/* The start of the actual kernel binary---used in vmlinux.lds.S
 144 * Leave some space after __PAGE_OFFSET for detecting kernel null
 145 * ptr derefs */
 146#define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 147
 148/* These macros don't work for 64-bit C code -- don't allow in C at all */
 149#ifdef __ASSEMBLY__
 150#   define PA(x)        ((x)-__PAGE_OFFSET)
 151#   define VA(x)        ((x)+__PAGE_OFFSET)
 152#endif
 153#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 154#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 155
 156#ifndef CONFIG_DISCONTIGMEM
 157#define pfn_valid(pfn)          ((pfn) < max_mapnr)
 158#endif /* CONFIG_DISCONTIGMEM */
 159
 160#ifdef CONFIG_HUGETLB_PAGE
 161#define HPAGE_SHIFT             22      /* 4MB (is this fixed?) */
 162#define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 163#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 164#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 165#endif
 166
 167#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 168
 169#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 170#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 171
 172#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 173                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 174
 175#include <asm-generic/memory_model.h>
 176#include <asm-generic/page.h>
 177
 178#endif /* __KERNEL__ */
 179
 180#endif /* _PARISC_PAGE_H */
 181