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_1GB)
41 # define HPAGE_SHIFT 30
42 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256MB)
43 # define HPAGE_SHIFT 28
44 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
45 # define HPAGE_SHIFT 26
46 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_16MB)
47 # define HPAGE_SHIFT 24
48 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
49 # define HPAGE_SHIFT 22
50 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
51 # define HPAGE_SHIFT 20
52 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256KB)
53 # define HPAGE_SHIFT 18
55 # error Unsupported IA-64 HugeTLB Page Size!
58 # define REGION_HPAGE (4UL) /* note: this is hardcoded in mmu_context.h:reload_context()!*/
59 # define REGION_SHIFT 61
60 # define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
61 # define HPAGE_MASK (~(HPAGE_SIZE - 1))
62 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
63 #endif /* CONFIG_HUGETLB_PAGE */
66 # define __pa(x) ((x) - PAGE_OFFSET)
67 # define __va(x) ((x) + PAGE_OFFSET)
68 #else /* !__ASSEMBLY */
70 # define STRICT_MM_TYPECHECKS
72 extern void clear_page (void *page);
73 extern void copy_page (void *to, void *from);
76 * clear_user_page() and copy_user_page() can't be inline functions because
77 * flush_dcache_page() can't be defined until later...
79 #define clear_user_page(addr, vaddr, page) \
82 flush_dcache_page(page); \
85 #define copy_user_page(to, from, vaddr, page) \
87 copy_page((to), (from)); \
88 flush_dcache_page(page); \
91 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
93 #ifndef CONFIG_DISCONTIGMEM
94 # ifdef CONFIG_VIRTUAL_MEM_MAP
95 extern int ia64_pfn_valid (unsigned long pfn);
96 # define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
98 # define pfn_valid(pfn) ((pfn) < max_mapnr)
100 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
101 #define page_to_pfn(page) ((unsigned long) (page - mem_map))
102 #define pfn_to_page(pfn) (mem_map + (pfn))
103 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
106 typedef union ia64_va {
108 unsigned long off : 61; /* intra-region offset */
109 unsigned long reg : 3; /* region number */
116 * Note: These macros depend on the fact that PAGE_OFFSET has all
117 * region bits set to 1 and all other bits set to zero. They are
118 * expressed in this way to ensure they result in a single "dep"
121 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
122 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
124 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
125 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
127 #define REGION_SIZE REGION_NUMBER(1)
128 #define REGION_KERNEL 7
130 #ifdef CONFIG_HUGETLB_PAGE
131 # define htlbpage_to_page(x) ((REGION_NUMBER(x) << 61) \
132 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
133 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
134 extern int is_invalid_hugepage_range(unsigned long addr, unsigned long len);
136 #define is_invalid_hugepage_range(addr, len) 0
139 static __inline__ int
140 get_order (unsigned long size)
145 __asm__ ("getf.exp %0=%1" : "=r"(order) : "f"(d));
146 order = order - PAGE_SHIFT - 0xffff + 1;
152 # endif /* __KERNEL__ */
153 #endif /* !__ASSEMBLY__ */
155 #ifdef STRICT_MM_TYPECHECKS
157 * These are used to make use of C type-checking..
159 typedef struct { unsigned long pte; } pte_t;
160 typedef struct { unsigned long pmd; } pmd_t;
161 typedef struct { unsigned long pgd; } pgd_t;
162 typedef struct { unsigned long pgprot; } pgprot_t;
164 # define pte_val(x) ((x).pte)
165 # define pmd_val(x) ((x).pmd)
166 # define pgd_val(x) ((x).pgd)
167 # define pgprot_val(x) ((x).pgprot)
169 # define __pte(x) ((pte_t) { (x) } )
170 # define __pgprot(x) ((pgprot_t) { (x) } )
172 #else /* !STRICT_MM_TYPECHECKS */
174 * .. while these make it easier on the compiler
176 # ifndef __ASSEMBLY__
177 typedef unsigned long pte_t;
178 typedef unsigned long pmd_t;
179 typedef unsigned long pgd_t;
180 typedef unsigned long pgprot_t;
183 # define pte_val(x) (x)
184 # define pmd_val(x) (x)
185 # define pgd_val(x) (x)
186 # define pgprot_val(x) (x)
188 # define __pte(x) (x)
189 # define __pgd(x) (x)
190 # define __pgprot(x) (x)
191 #endif /* !STRICT_MM_TYPECHECKS */
193 #define PAGE_OFFSET 0xe000000000000000
195 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
196 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
197 (((current->thread.flags & IA64_THREAD_XSTACK) != 0) \
200 #endif /* _ASM_IA64_PAGE_H */