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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 #else
109 # include <asm-generic/memory_model.h>
110 #endif
111 #else
112 # include <asm-generic/memory_model.h>
113 #endif
114 
115 #ifdef CONFIG_FLATMEM
116 # define pfn_valid(pfn)         (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
117 #elif defined(CONFIG_DISCONTIGMEM)
118 extern unsigned long min_low_pfn;
119 extern unsigned long max_low_pfn;
120 # define pfn_valid(pfn)         (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
121 #endif
122 
123 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
124 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
125 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
126 
127 typedef union ia64_va {
128         struct {
129                 unsigned long off : 61;         /* intra-region offset */
130                 unsigned long reg :  3;         /* region number */
131         } f;
132         unsigned long l;
133         void *p;
134 } ia64_va;
135 
136 /*
137  * Note: These macros depend on the fact that PAGE_OFFSET has all
138  * region bits set to 1 and all other bits set to zero.  They are
139  * expressed in this way to ensure they result in a single "dep"
140  * instruction.
141  */
142 #define __pa(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
143 #define __va(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
144 
145 #define REGION_NUMBER(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
146 #define REGION_OFFSET(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
147 
148 #ifdef CONFIG_HUGETLB_PAGE
149 # define htlbpage_to_page(x)    (((unsigned long) REGION_NUMBER(x) << 61)                       \
150                                  | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
151 # define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT - PAGE_SHIFT)
152 extern unsigned int hpage_shift;
153 #endif
154 
155 static __inline__ int
156 get_order (unsigned long size)
157 {
158         long double d = size - 1;
159         long order;
160 
161         order = ia64_getf_exp(d);
162         order = order - PAGE_SHIFT - 0xffff + 1;
163         if (order < 0)
164                 order = 0;
165         return order;
166 }
167 
168 #endif /* !__ASSEMBLY__ */
169 
170 #ifdef STRICT_MM_TYPECHECKS
171   /*
172    * These are used to make use of C type-checking..
173    */
174   typedef struct { unsigned long pte; } pte_t;
175   typedef struct { unsigned long pmd; } pmd_t;
176 #if CONFIG_PGTABLE_LEVELS == 4
177   typedef struct { unsigned long pud; } pud_t;
178 #endif
179   typedef struct { unsigned long pgd; } pgd_t;
180   typedef struct { unsigned long pgprot; } pgprot_t;
181   typedef struct page *pgtable_t;
182 
183 # define pte_val(x)     ((x).pte)
184 # define pmd_val(x)     ((x).pmd)
185 #if CONFIG_PGTABLE_LEVELS == 4
186 # define pud_val(x)     ((x).pud)
187 #endif
188 # define pgd_val(x)     ((x).pgd)
189 # define pgprot_val(x)  ((x).pgprot)
190 
191 # define __pte(x)       ((pte_t) { (x) } )
192 # define __pmd(x)       ((pmd_t) { (x) } )
193 # define __pgprot(x)    ((pgprot_t) { (x) } )
194 
195 #else /* !STRICT_MM_TYPECHECKS */
196   /*
197    * .. while these make it easier on the compiler
198    */
199 # ifndef __ASSEMBLY__
200     typedef unsigned long pte_t;
201     typedef unsigned long pmd_t;
202     typedef unsigned long pgd_t;
203     typedef unsigned long pgprot_t;
204     typedef struct page *pgtable_t;
205 # endif
206 
207 # define pte_val(x)     (x)
208 # define pmd_val(x)     (x)
209 # define pgd_val(x)     (x)
210 # define pgprot_val(x)  (x)
211 
212 # define __pte(x)       (x)
213 # define __pgd(x)       (x)
214 # define __pgprot(x)    (x)
215 #endif /* !STRICT_MM_TYPECHECKS */
216 
217 #define PAGE_OFFSET                     RGN_BASE(RGN_KERNEL)
218 
219 #define VM_DATA_DEFAULT_FLAGS           (VM_READ | VM_WRITE |                                   \
220                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |                \
221                                          (((current->personality & READ_IMPLIES_EXEC) != 0)     \
222                                           ? VM_EXEC : 0))
223 
224 #define GATE_ADDR               RGN_BASE(RGN_GATE)
225 
226 /*
227  * 0xa000000000000000+2*PERCPU_PAGE_SIZE
228  * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page)
229  */
230 #define KERNEL_START             (GATE_ADDR+__IA64_UL_CONST(0x100000000))
231 #define PERCPU_ADDR             (-PERCPU_PAGE_SIZE)
232 #define LOAD_OFFSET             (KERNEL_START - KERNEL_TR_PAGE_SIZE)
233 
234 #define __HAVE_ARCH_GATE_AREA   1
235 
236 #endif /* _ASM_IA64_PAGE_H */
237 

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