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)        clear_page_asm((void *)(page))
  25#define copy_page(to, from)     copy_page_asm((void *)(to), (void *)(from))
  26
  27struct page;
  28
  29void clear_page_asm(void *page);
  30void copy_page_asm(void *to, void *from);
  31#define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
  32void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  33                        struct page *pg);
  34
  35/*
  36 * These are used to make use of C type-checking..
  37 */
  38#define STRICT_MM_TYPECHECKS
  39#ifdef STRICT_MM_TYPECHECKS
  40typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
  41
  42/* NOTE: even on 64 bits, these entries are __u32 because we allocate
  43 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  44typedef struct { __u32 pmd; } pmd_t;
  45typedef struct { __u32 pgd; } pgd_t;
  46typedef struct { unsigned long pgprot; } pgprot_t;
  47
  48#define pte_val(x)      ((x).pte)
  49/* These do not work lvalues, so make sure we don't use them as such. */
  50#define pmd_val(x)      ((x).pmd + 0)
  51#define pgd_val(x)      ((x).pgd + 0)
  52#define pgprot_val(x)   ((x).pgprot)
  53
  54#define __pte(x)        ((pte_t) { (x) } )
  55#define __pmd(x)        ((pmd_t) { (x) } )
  56#define __pgd(x)        ((pgd_t) { (x) } )
  57#define __pgprot(x)     ((pgprot_t) { (x) } )
  58
  59#define __pmd_val_set(x,n) (x).pmd = (n)
  60#define __pgd_val_set(x,n) (x).pgd = (n)
  61
  62#else
  63/*
  64 * .. while these make it easier on the compiler
  65 */
  66typedef unsigned long pte_t;
  67typedef         __u32 pmd_t;
  68typedef         __u32 pgd_t;
  69typedef unsigned long pgprot_t;
  70
  71#define pte_val(x)      (x)
  72#define pmd_val(x)      (x)
  73#define pgd_val(x)      (x)
  74#define pgprot_val(x)   (x)
  75
  76#define __pte(x)        (x)
  77#define __pmd(x)        (x)
  78#define __pgd(x)        (x)
  79#define __pgprot(x)     (x)
  80
  81#define __pmd_val_set(x,n) (x) = (n)
  82#define __pgd_val_set(x,n) (x) = (n)
  83
  84#endif /* STRICT_MM_TYPECHECKS */
  85
  86typedef struct page *pgtable_t;
  87
  88typedef struct __physmem_range {
  89        unsigned long start_pfn;
  90        unsigned long pages;       /* PAGE_SIZE pages */
  91} physmem_range_t;
  92
  93extern physmem_range_t pmem_ranges[];
  94extern int npmem_ranges;
  95
  96#endif /* !__ASSEMBLY__ */
  97
  98/* WARNING: The definitions below must match exactly to sizeof(pte_t)
  99 * etc
 100 */
 101#ifdef CONFIG_64BIT
 102#define BITS_PER_PTE_ENTRY      3
 103#define BITS_PER_PMD_ENTRY      2
 104#define BITS_PER_PGD_ENTRY      2
 105#else
 106#define BITS_PER_PTE_ENTRY      2
 107#define BITS_PER_PMD_ENTRY      2
 108#define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 109#endif
 110#define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 111#define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 112#define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 113
 114#define LINUX_GATEWAY_SPACE     0
 115
 116/* This governs the relationship between virtual and physical addresses.
 117 * If you alter it, make sure to take care of our various fixed mapping
 118 * segments in fixmap.h */
 119#ifdef CONFIG_64BIT
 120#define __PAGE_OFFSET   (0x40000000)    /* 1GB */
 121#else
 122#define __PAGE_OFFSET   (0x10000000)    /* 256MB */
 123#endif
 124
 125#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 126
 127/* The size of the gateway page (we leave lots of room for expansion) */
 128#define GATEWAY_PAGE_SIZE       0x4000
 129
 130/* The start of the actual kernel binary---used in vmlinux.lds.S
 131 * Leave some space after __PAGE_OFFSET for detecting kernel null
 132 * ptr derefs */
 133#define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 134
 135/* These macros don't work for 64-bit C code -- don't allow in C at all */
 136#ifdef __ASSEMBLY__
 137#   define PA(x)        ((x)-__PAGE_OFFSET)
 138#   define VA(x)        ((x)+__PAGE_OFFSET)
 139#endif
 140#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 141#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 142
 143#ifndef CONFIG_DISCONTIGMEM
 144#define pfn_valid(pfn)          ((pfn) < max_mapnr)
 145#endif /* CONFIG_DISCONTIGMEM */
 146
 147#ifdef CONFIG_HUGETLB_PAGE
 148#define HPAGE_SHIFT             PMD_SHIFT /* fixed for transparent huge pages */
 149#define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 150#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 151#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 152
 153#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 154# define REAL_HPAGE_SHIFT       20 /* 20 = 1MB */
 155# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
 156#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 157# define REAL_HPAGE_SHIFT       22 /* 22 = 4MB */
 158# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
 159#else
 160# define REAL_HPAGE_SHIFT       24 /* 24 = 16MB */
 161# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
 162#endif
 163#endif /* CONFIG_HUGETLB_PAGE */
 164
 165#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 166
 167#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 168#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 169
 170#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 171                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 172
 173#include <asm-generic/memory_model.h>
 174#include <asm-generic/getorder.h>
 175#include <asm/pdc.h>
 176
 177#define PAGE0   ((struct zeropage *)__PAGE_OFFSET)
 178
 179/* DEFINITION OF THE ZERO-PAGE (PAG0) */
 180/* based on work by Jason Eckhardt (jason@equator.com) */
 181
 182#endif /* _PARISC_PAGE_H */
 183