1 #ifndef _ASM_IA64_PAGE_H
2 #define _ASM_IA64_PAGE_H
4 * Pagetable related stuff.
6 * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
7 * David Mosberger-Tang <davidm@hpl.hp.com>
11 #include <asm/intrinsics.h>
12 #include <asm/types.h>
15 * The top three bits of an IA64 address are its Region Number.
16 * Different regions are assigned to different purposes.
18 #define RGN_SHIFT (61)
19 #define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
20 #define RGN_BITS (RGN_BASE(-1))
22 #define RGN_KERNEL 7 /* Identity mapped region */
23 #define RGN_UNCACHED 6 /* Identity mapped I/O region */
24 #define RGN_GATE 5 /* Gate page, Kernel text, etc */
25 #define RGN_HPAGE 4 /* For Huge TLB pages */
28 * PAGE_SHIFT determines the actual kernel page size.
30 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
31 # define PAGE_SHIFT 12
32 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
33 # define PAGE_SHIFT 13
34 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
35 # define PAGE_SHIFT 14
36 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
37 # define PAGE_SHIFT 16
39 # error Unsupported page size!
42 #define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
43 #define PAGE_MASK (~(PAGE_SIZE - 1))
44 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
46 #define PERCPU_PAGE_SHIFT 16 /* log2() of max. size of per-CPU area */
47 #define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
50 #ifdef CONFIG_HUGETLB_PAGE
51 # define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
52 # define HPAGE_SHIFT hpage_shift
53 # define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */
54 # define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
55 # define HPAGE_MASK (~(HPAGE_SIZE - 1))
57 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
58 # define ARCH_HAS_HUGEPAGE_ONLY_RANGE
59 # define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
60 # define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
61 #endif /* CONFIG_HUGETLB_PAGE */
64 # define __pa(x) ((x) - PAGE_OFFSET)
65 # define __va(x) ((x) + PAGE_OFFSET)
66 #else /* !__ASSEMBLY */
68 # define STRICT_MM_TYPECHECKS
70 extern void clear_page (void *page);
71 extern void copy_page (void *to, void *from);
74 * clear_user_page() and copy_user_page() can't be inline functions because
75 * flush_dcache_page() can't be defined until later...
77 #define clear_user_page(addr, vaddr, page) \
80 flush_dcache_page(page); \
83 #define copy_user_page(to, from, vaddr, page) \
85 copy_page((to), (from)); \
86 flush_dcache_page(page); \
90 #define alloc_zeroed_user_highpage(vma, vaddr) \
92 struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \
94 flush_dcache_page(page); \
98 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
100 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
102 #ifdef CONFIG_VIRTUAL_MEM_MAP
103 extern int ia64_pfn_valid (unsigned long pfn);
104 #elif defined(CONFIG_FLATMEM)
105 # define ia64_pfn_valid(pfn) 1
108 #ifdef CONFIG_VIRTUAL_MEM_MAP
109 extern struct page *vmem_map;
110 #ifdef CONFIG_DISCONTIGMEM
111 # define page_to_pfn(page) ((unsigned long) (page - vmem_map))
112 # define pfn_to_page(pfn) (vmem_map + (pfn))
116 #if defined(CONFIG_FLATMEM) || defined(CONFIG_SPARSEMEM)
117 /* FLATMEM always configures mem_map (mem_map = vmem_map if necessary) */
118 #include <asm-generic/memory_model.h>
121 #ifdef CONFIG_FLATMEM
122 # define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
123 #elif defined(CONFIG_DISCONTIGMEM)
124 extern unsigned long min_low_pfn;
125 extern unsigned long max_low_pfn;
126 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
129 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
130 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
131 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
133 typedef union ia64_va {
135 unsigned long off : 61; /* intra-region offset */
136 unsigned long reg : 3; /* region number */
143 * Note: These macros depend on the fact that PAGE_OFFSET has all
144 * region bits set to 1 and all other bits set to zero. They are
145 * expressed in this way to ensure they result in a single "dep"
148 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
149 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
151 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
152 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
154 #ifdef CONFIG_HUGETLB_PAGE
155 # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
156 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
157 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
158 # define is_hugepage_only_range(mm, addr, len) \
159 (REGION_NUMBER(addr) == RGN_HPAGE || \
160 REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
161 extern unsigned int hpage_shift;
164 static __inline__ int
165 get_order (unsigned long size)
167 long double d = size - 1;
170 order = ia64_getf_exp(d);
171 order = order - PAGE_SHIFT - 0xffff + 1;
177 # endif /* __KERNEL__ */
178 #endif /* !__ASSEMBLY__ */
180 #ifdef STRICT_MM_TYPECHECKS
182 * These are used to make use of C type-checking..
184 typedef struct { unsigned long pte; } pte_t;
185 typedef struct { unsigned long pmd; } pmd_t;
186 #ifdef CONFIG_PGTABLE_4
187 typedef struct { unsigned long pud; } pud_t;
189 typedef struct { unsigned long pgd; } pgd_t;
190 typedef struct { unsigned long pgprot; } pgprot_t;
192 # define pte_val(x) ((x).pte)
193 # define pmd_val(x) ((x).pmd)
194 #ifdef CONFIG_PGTABLE_4
195 # define pud_val(x) ((x).pud)
197 # define pgd_val(x) ((x).pgd)
198 # define pgprot_val(x) ((x).pgprot)
200 # define __pte(x) ((pte_t) { (x) } )
201 # define __pgprot(x) ((pgprot_t) { (x) } )
203 #else /* !STRICT_MM_TYPECHECKS */
205 * .. while these make it easier on the compiler
207 # ifndef __ASSEMBLY__
208 typedef unsigned long pte_t;
209 typedef unsigned long pmd_t;
210 typedef unsigned long pgd_t;
211 typedef unsigned long pgprot_t;
214 # define pte_val(x) (x)
215 # define pmd_val(x) (x)
216 # define pgd_val(x) (x)
217 # define pgprot_val(x) (x)
219 # define __pte(x) (x)
220 # define __pgd(x) (x)
221 # define __pgprot(x) (x)
222 #endif /* !STRICT_MM_TYPECHECKS */
224 #define PAGE_OFFSET RGN_BASE(RGN_KERNEL)
226 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
227 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
228 (((current->personality & READ_IMPLIES_EXEC) != 0) \
231 #endif /* _ASM_IA64_PAGE_H */