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Linux/arch/ia64/include/asm/page.h

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  1 #ifndef _ASM_IA64_PAGE_H
  2 #define _ASM_IA64_PAGE_H
  3 /*
  4  * Pagetable related stuff.
  5  *
  6  * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
  7  *      David Mosberger-Tang <davidm@hpl.hp.com>
  8  */
  9 
 10 #include <asm/intrinsics.h>
 11 #include <asm/types.h>
 12 
 13 /*
 14  * The top three bits of an IA64 address are its Region Number.
 15  * Different regions are assigned to different purposes.
 16  */
 17 #define RGN_SHIFT       (61)
 18 #define RGN_BASE(r)     (__IA64_UL_CONST(r)<<RGN_SHIFT)
 19 #define RGN_BITS        (RGN_BASE(-1))
 20 
 21 #define RGN_KERNEL      7       /* Identity mapped region */
 22 #define RGN_UNCACHED    6       /* Identity mapped I/O region */
 23 #define RGN_GATE        5       /* Gate page, Kernel text, etc */
 24 #define RGN_HPAGE       4       /* For Huge TLB pages */
 25 
 26 /*
 27  * PAGE_SHIFT determines the actual kernel page size.
 28  */
 29 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
 30 # define PAGE_SHIFT     12
 31 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
 32 # define PAGE_SHIFT     13
 33 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
 34 # define PAGE_SHIFT     14
 35 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
 36 # define PAGE_SHIFT     16
 37 #else
 38 # error Unsupported page size!
 39 #endif
 40 
 41 #define PAGE_SIZE               (__IA64_UL_CONST(1) << PAGE_SHIFT)
 42 #define PAGE_MASK               (~(PAGE_SIZE - 1))
 43 
 44 #define PERCPU_PAGE_SHIFT       18      /* log2() of max. size of per-CPU area */
 45 #define PERCPU_PAGE_SIZE        (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
 46 
 47 
 48 #ifdef CONFIG_HUGETLB_PAGE
 49 # define HPAGE_REGION_BASE      RGN_BASE(RGN_HPAGE)
 50 # define HPAGE_SHIFT            hpage_shift
 51 # define HPAGE_SHIFT_DEFAULT    28      /* check ia64 SDM for architecture supported size */
 52 # define HPAGE_SIZE             (__IA64_UL_CONST(1) << HPAGE_SHIFT)
 53 # define HPAGE_MASK             (~(HPAGE_SIZE - 1))
 54 
 55 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 56 #endif /* CONFIG_HUGETLB_PAGE */
 57 
 58 #ifdef __ASSEMBLY__
 59 # define __pa(x)                ((x) - PAGE_OFFSET)
 60 # define __va(x)                ((x) + PAGE_OFFSET)
 61 #else /* !__ASSEMBLY */
 62 #  define STRICT_MM_TYPECHECKS
 63 
 64 extern void clear_page (void *page);
 65 extern void copy_page (void *to, void *from);
 66 
 67 /*
 68  * clear_user_page() and copy_user_page() can't be inline functions because
 69  * flush_dcache_page() can't be defined until later...
 70  */
 71 #define clear_user_page(addr, vaddr, page)      \
 72 do {                                            \
 73         clear_page(addr);                       \
 74         flush_dcache_page(page);                \
 75 } while (0)
 76 
 77 #define copy_user_page(to, from, vaddr, page)   \
 78 do {                                            \
 79         copy_page((to), (from));                \
 80         flush_dcache_page(page);                \
 81 } while (0)
 82 
 83 
 84 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr)          \
 85 ({                                                                      \
 86         struct page *page = alloc_page_vma(                             \
 87                 GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr);  \
 88         if (page)                                                       \
 89                 flush_dcache_page(page);                                \
 90         page;                                                           \
 91 })
 92 
 93 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
 94 
 95 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 96 
 97 #ifdef CONFIG_VIRTUAL_MEM_MAP
 98 extern int ia64_pfn_valid (unsigned long pfn);
 99 #else
100 # define ia64_pfn_valid(pfn) 1
101 #endif
102 
103 #ifdef CONFIG_VIRTUAL_MEM_MAP
104 extern struct page *vmem_map;
105 #ifdef CONFIG_DISCONTIGMEM
106 # define page_to_pfn(page)      ((unsigned long) (page - vmem_map))
107 # define pfn_to_page(pfn)       (vmem_map + (pfn))
108 # define __pfn_to_phys(pfn)     PFN_PHYS(pfn)
109 #else
110 # include <asm-generic/memory_model.h>
111 #endif
112 #else
113 # include <asm-generic/memory_model.h>
114 #endif
115 
116 #ifdef CONFIG_FLATMEM
117 # define pfn_valid(pfn)         (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
118 #elif defined(CONFIG_DISCONTIGMEM)
119 extern unsigned long min_low_pfn;
120 extern unsigned long max_low_pfn;
121 # define pfn_valid(pfn)         (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
122 #endif
123 
124 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
125 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
126 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
127 
128 typedef union ia64_va {
129         struct {
130                 unsigned long off : 61;         /* intra-region offset */
131                 unsigned long reg :  3;         /* region number */
132         } f;
133         unsigned long l;
134         void *p;
135 } ia64_va;
136 
137 /*
138  * Note: These macros depend on the fact that PAGE_OFFSET has all
139  * region bits set to 1 and all other bits set to zero.  They are
140  * expressed in this way to ensure they result in a single "dep"
141  * instruction.
142  */
143 #define __pa(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
144 #define __va(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
145 
146 #define REGION_NUMBER(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
147 #define REGION_OFFSET(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
148 
149 #ifdef CONFIG_HUGETLB_PAGE
150 # define htlbpage_to_page(x)    (((unsigned long) REGION_NUMBER(x) << 61)                       \
151                                  | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
152 # define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT - PAGE_SHIFT)
153 extern unsigned int hpage_shift;
154 #endif
155 
156 static __inline__ int
157 get_order (unsigned long size)
158 {
159         long double d = size - 1;
160         long order;
161 
162         order = ia64_getf_exp(d);
163         order = order - PAGE_SHIFT - 0xffff + 1;
164         if (order < 0)
165                 order = 0;
166         return order;
167 }
168 
169 #endif /* !__ASSEMBLY__ */
170 
171 #ifdef STRICT_MM_TYPECHECKS
172   /*
173    * These are used to make use of C type-checking..
174    */
175   typedef struct { unsigned long pte; } pte_t;
176   typedef struct { unsigned long pmd; } pmd_t;
177 #if CONFIG_PGTABLE_LEVELS == 4
178   typedef struct { unsigned long pud; } pud_t;
179 #endif
180   typedef struct { unsigned long pgd; } pgd_t;
181   typedef struct { unsigned long pgprot; } pgprot_t;
182   typedef struct page *pgtable_t;
183 
184 # define pte_val(x)     ((x).pte)
185 # define pmd_val(x)     ((x).pmd)
186 #if CONFIG_PGTABLE_LEVELS == 4
187 # define pud_val(x)     ((x).pud)
188 #endif
189 # define pgd_val(x)     ((x).pgd)
190 # define pgprot_val(x)  ((x).pgprot)
191 
192 # define __pte(x)       ((pte_t) { (x) } )
193 # define __pmd(x)       ((pmd_t) { (x) } )
194 # define __pgprot(x)    ((pgprot_t) { (x) } )
195 
196 #else /* !STRICT_MM_TYPECHECKS */
197   /*
198    * .. while these make it easier on the compiler
199    */
200 # ifndef __ASSEMBLY__
201     typedef unsigned long pte_t;
202     typedef unsigned long pmd_t;
203     typedef unsigned long pgd_t;
204     typedef unsigned long pgprot_t;
205     typedef struct page *pgtable_t;
206 # endif
207 
208 # define pte_val(x)     (x)
209 # define pmd_val(x)     (x)
210 # define pgd_val(x)     (x)
211 # define pgprot_val(x)  (x)
212 
213 # define __pte(x)       (x)
214 # define __pgd(x)       (x)
215 # define __pgprot(x)    (x)
216 #endif /* !STRICT_MM_TYPECHECKS */
217 
218 #define PAGE_OFFSET                     RGN_BASE(RGN_KERNEL)
219 
220 #define VM_DATA_DEFAULT_FLAGS           (VM_READ | VM_WRITE |                                   \
221                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |                \
222                                          (((current->personality & READ_IMPLIES_EXEC) != 0)     \
223                                           ? VM_EXEC : 0))
224 
225 #define GATE_ADDR               RGN_BASE(RGN_GATE)
226 
227 /*
228  * 0xa000000000000000+2*PERCPU_PAGE_SIZE
229  * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page)
230  */
231 #define KERNEL_START             (GATE_ADDR+__IA64_UL_CONST(0x100000000))
232 #define PERCPU_ADDR             (-PERCPU_PAGE_SIZE)
233 #define LOAD_OFFSET             (KERNEL_START - KERNEL_TR_PAGE_SIZE)
234 
235 #define __HAVE_ARCH_GATE_AREA   1
236 
237 #endif /* _ASM_IA64_PAGE_H */
238 

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