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; } pte_t; /* either 32 or 64bit */
  40
  41/* NOTE: even on 64 bits, these entries are __u32 because we allocate
  42 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  43typedef struct { __u32 pmd; } pmd_t;
  44typedef struct { __u32 pgd; } pgd_t;
  45typedef struct { unsigned long pgprot; } pgprot_t;
  46
  47#define pte_val(x)      ((x).pte)
  48/* These do not work lvalues, so make sure we don't use them as such. */
  49#define pmd_val(x)      ((x).pmd + 0)
  50#define pgd_val(x)      ((x).pgd + 0)
  51#define pgprot_val(x)   ((x).pgprot)
  52
  53#define __pte(x)        ((pte_t) { (x) } )
  54#define __pmd(x)        ((pmd_t) { (x) } )
  55#define __pgd(x)        ((pgd_t) { (x) } )
  56#define __pgprot(x)     ((pgprot_t) { (x) } )
  57
  58#define __pmd_val_set(x,n) (x).pmd = (n)
  59#define __pgd_val_set(x,n) (x).pgd = (n)
  60
  61#else
  62/*
  63 * .. while these make it easier on the compiler
  64 */
  65typedef unsigned long pte_t;
  66typedef         __u32 pmd_t;
  67typedef         __u32 pgd_t;
  68typedef unsigned long pgprot_t;
  69
  70#define pte_val(x)      (x)
  71#define pmd_val(x)      (x)
  72#define pgd_val(x)      (x)
  73#define pgprot_val(x)   (x)
  74
  75#define __pte(x)        (x)
  76#define __pmd(x)        (x)
  77#define __pgd(x)        (x)
  78#define __pgprot(x)     (x)
  79
  80#define __pmd_val_set(x,n) (x) = (n)
  81#define __pgd_val_set(x,n) (x) = (n)
  82
  83#endif /* STRICT_MM_TYPECHECKS */
  84
  85typedef struct page *pgtable_t;
  86
  87typedef struct __physmem_range {
  88        unsigned long start_pfn;
  89        unsigned long pages;       /* PAGE_SIZE pages */
  90} physmem_range_t;
  91
  92extern physmem_range_t pmem_ranges[];
  93extern int npmem_ranges;
  94
  95#endif /* !__ASSEMBLY__ */
  96
  97/* WARNING: The definitions below must match exactly to sizeof(pte_t)
  98 * etc
  99 */
 100#ifdef CONFIG_64BIT
 101#define BITS_PER_PTE_ENTRY      3
 102#define BITS_PER_PMD_ENTRY      2
 103#define BITS_PER_PGD_ENTRY      2
 104#else
 105#define BITS_PER_PTE_ENTRY      2
 106#define BITS_PER_PMD_ENTRY      2
 107#define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 108#endif
 109#define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 110#define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 111#define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 112
 113#define LINUX_GATEWAY_SPACE     0
 114
 115/* This governs the relationship between virtual and physical addresses.
 116 * If you alter it, make sure to take care of our various fixed mapping
 117 * segments in fixmap.h */
 118#ifdef CONFIG_64BIT
 119#define __PAGE_OFFSET   (0x40000000)    /* 1GB */
 120#else
 121#define __PAGE_OFFSET   (0x10000000)    /* 256MB */
 122#endif
 123
 124#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 125
 126/* The size of the gateway page (we leave lots of room for expansion) */
 127#define GATEWAY_PAGE_SIZE       0x4000
 128
 129/* The start of the actual kernel binary---used in vmlinux.lds.S
 130 * Leave some space after __PAGE_OFFSET for detecting kernel null
 131 * ptr derefs */
 132#define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 133
 134/* These macros don't work for 64-bit C code -- don't allow in C at all */
 135#ifdef __ASSEMBLY__
 136#   define PA(x)        ((x)-__PAGE_OFFSET)
 137#   define VA(x)        ((x)+__PAGE_OFFSET)
 138#endif
 139#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 140#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 141
 142#ifndef CONFIG_DISCONTIGMEM
 143#define pfn_valid(pfn)          ((pfn) < max_mapnr)
 144#endif /* CONFIG_DISCONTIGMEM */
 145
 146#ifdef CONFIG_HUGETLB_PAGE
 147#define HPAGE_SHIFT             22      /* 4MB (is this fixed?) */
 148#define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 149#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 150#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 151#endif
 152
 153#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 154
 155#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 156#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 157
 158#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 159                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 160
 161#include <asm-generic/memory_model.h>
 162#include <asm-generic/getorder.h>
 163
 164#endif /* _PARISC_PAGE_H */
 165