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>
10 #include <linux/config.h>
12 #include <asm/types.h>
15 * PAGE_SHIFT determines the actual kernel page size.
17 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
18 # define PAGE_SHIFT 12
19 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
20 # define PAGE_SHIFT 13
21 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
22 # define PAGE_SHIFT 14
23 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
24 # define PAGE_SHIFT 16
26 # error Unsupported page size!
29 #define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
30 #define PAGE_MASK (~(PAGE_SIZE - 1))
31 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
33 #define PERCPU_PAGE_SHIFT 16 /* log2() of max. size of per-CPU area */
34 #define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
36 #ifdef CONFIG_HUGETLB_PAGE
38 # if defined(CONFIG_HUGETLB_PAGE_SIZE_4GB)
39 # define HPAGE_SHIFT 32
40 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256MB)
41 # define HPAGE_SHIFT 28
42 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
43 # define HPAGE_SHIFT 26
44 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_16MB)
45 # define HPAGE_SHIFT 24
46 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
47 # define HPAGE_SHIFT 22
48 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
49 # define HPAGE_SHIFT 20
50 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256KB)
51 # define HPAGE_SHIFT 18
53 # error Unsupported IA-64 HugeTLB Page Size!
56 # define REGION_HPAGE (4UL) /* note: this is hardcoded in mmu_context.h:reload_context()!*/
57 # define REGION_SHIFT 61
58 # define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
59 # define HPAGE_MASK (~(HPAGE_SIZE - 1))
60 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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); \
89 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
91 #ifndef CONFIG_DISCONTIGMEM
92 #define pfn_valid(pfn) ((pfn) < max_mapnr)
93 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
94 #define page_to_pfn(page) ((unsigned long) (page - mem_map))
95 #define pfn_to_page(pfn) (mem_map + (pfn))
96 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
99 typedef union ia64_va {
101 unsigned long off : 61; /* intra-region offset */
102 unsigned long reg : 3; /* region number */
109 * Note: These macros depend on the fact that PAGE_OFFSET has all
110 * region bits set to 1 and all other bits set to zero. They are
111 * expressed in this way to ensure they result in a single "dep"
114 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
115 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
117 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
118 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
120 #define REGION_SIZE REGION_NUMBER(1)
121 #define REGION_KERNEL 7
123 #ifdef CONFIG_HUGETLB_PAGE
124 # define htlbpage_to_page(x) ((REGION_NUMBER(x) << 61) \
125 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
126 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
127 extern int is_invalid_hugepage_range(unsigned long addr, unsigned long len);
129 #define is_invalid_hugepage_range(addr, len) 0
132 static __inline__ int
133 get_order (unsigned long size)
138 __asm__ ("getf.exp %0=%1" : "=r"(order) : "f"(d));
139 order = order - PAGE_SHIFT - 0xffff + 1;
145 # endif /* __KERNEL__ */
146 #endif /* !__ASSEMBLY__ */
148 #ifdef STRICT_MM_TYPECHECKS
150 * These are used to make use of C type-checking..
152 typedef struct { unsigned long pte; } pte_t;
153 typedef struct { unsigned long pmd; } pmd_t;
154 typedef struct { unsigned long pgd; } pgd_t;
155 typedef struct { unsigned long pgprot; } pgprot_t;
157 # define pte_val(x) ((x).pte)
158 # define pmd_val(x) ((x).pmd)
159 # define pgd_val(x) ((x).pgd)
160 # define pgprot_val(x) ((x).pgprot)
162 # define __pte(x) ((pte_t) { (x) } )
163 # define __pgprot(x) ((pgprot_t) { (x) } )
165 #else /* !STRICT_MM_TYPECHECKS */
167 * .. while these make it easier on the compiler
169 # ifndef __ASSEMBLY__
170 typedef unsigned long pte_t;
171 typedef unsigned long pmd_t;
172 typedef unsigned long pgd_t;
173 typedef unsigned long pgprot_t;
176 # define pte_val(x) (x)
177 # define pmd_val(x) (x)
178 # define pgd_val(x) (x)
179 # define pgprot_val(x) (x)
181 # define __pte(x) (x)
182 # define __pgd(x) (x)
183 # define __pgprot(x) (x)
184 #endif /* !STRICT_MM_TYPECHECKS */
186 #define PAGE_OFFSET 0xe000000000000000
188 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
189 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
190 (((current->thread.flags & IA64_THREAD_XSTACK) != 0) \
193 #endif /* _ASM_IA64_PAGE_H */