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Linux/arch/parisc/include/asm/page.h

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  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 
 27 struct page;
 28 
 29 void clear_page_asm(void *page);
 30 void copy_page_asm(void *to, void *from);
 31 #define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
 32 void 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
 40 typedef 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) */
 44 typedef struct { __u32 pmd; } pmd_t;
 45 typedef struct { __u32 pgd; } pgd_t;
 46 typedef 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  */
 66 typedef unsigned long pte_t;
 67 typedef         __u32 pmd_t;
 68 typedef         __u32 pgd_t;
 69 typedef 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 
 86 typedef struct page *pgtable_t;
 87 
 88 typedef struct __physmem_range {
 89         unsigned long start_pfn;
 90         unsigned long pages;       /* PAGE_SIZE pages */
 91 } physmem_range_t;
 92 
 93 extern physmem_range_t pmem_ranges[];
 94 extern 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             22      /* 4MB (is this fixed?) */
149 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
150 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
151 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
152 #endif
153 
154 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
155 
156 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
157 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
158 
159 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
160                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
161 
162 #include <asm-generic/memory_model.h>
163 #include <asm-generic/getorder.h>
164 #include <asm/pdc.h>
165 
166 #define PAGE0   ((struct zeropage *)__PAGE_OFFSET)
167 
168 /* DEFINITION OF THE ZERO-PAGE (PAG0) */
169 /* based on work by Jason Eckhardt (jason@equator.com) */
170 
171 #endif /* _PARISC_PAGE_H */
172 

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