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/intrinsics.h>
13 #include <asm/types.h>
16 * The top three bits of an IA64 address are its Region Number.
17 * Different regions are assigned to different purposes.
19 #define RGN_SHIFT (61)
20 #define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
21 #define RGN_BITS (RGN_BASE(-1))
23 #define RGN_KERNEL 7 /* Identity mapped region */
24 #define RGN_UNCACHED 6 /* Identity mapped I/O region */
25 #define RGN_GATE 5 /* Gate page, Kernel text, etc */
26 #define RGN_HPAGE 4 /* For Huge TLB pages */
29 * PAGE_SHIFT determines the actual kernel page size.
31 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
32 # define PAGE_SHIFT 12
33 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
34 # define PAGE_SHIFT 13
35 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
36 # define PAGE_SHIFT 14
37 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
38 # define PAGE_SHIFT 16
40 # error Unsupported page size!
43 #define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
44 #define PAGE_MASK (~(PAGE_SIZE - 1))
45 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
47 #define PERCPU_PAGE_SHIFT 16 /* log2() of max. size of per-CPU area */
48 #define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
50 #define RGN_MAP_LIMIT ((1UL << (4*PAGE_SHIFT - 12)) - PAGE_SIZE) /* per region addr limit */
53 #ifdef CONFIG_HUGETLB_PAGE
54 # define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
55 # define HPAGE_SHIFT hpage_shift
56 # define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */
57 # define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
58 # define HPAGE_MASK (~(HPAGE_SIZE - 1))
60 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
61 # define ARCH_HAS_HUGEPAGE_ONLY_RANGE
62 #endif /* CONFIG_HUGETLB_PAGE */
65 # define __pa(x) ((x) - PAGE_OFFSET)
66 # define __va(x) ((x) + PAGE_OFFSET)
67 #else /* !__ASSEMBLY */
69 # define STRICT_MM_TYPECHECKS
71 extern void clear_page (void *page);
72 extern void copy_page (void *to, void *from);
75 * clear_user_page() and copy_user_page() can't be inline functions because
76 * flush_dcache_page() can't be defined until later...
78 #define clear_user_page(addr, vaddr, page) \
81 flush_dcache_page(page); \
84 #define copy_user_page(to, from, vaddr, page) \
86 copy_page((to), (from)); \
87 flush_dcache_page(page); \
91 #define alloc_zeroed_user_highpage(vma, vaddr) \
93 struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \
95 flush_dcache_page(page); \
99 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
101 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
103 #ifdef CONFIG_VIRTUAL_MEM_MAP
104 extern int ia64_pfn_valid (unsigned long pfn);
106 # define ia64_pfn_valid(pfn) 1
109 #ifndef CONFIG_DISCONTIGMEM
110 # define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
111 # define page_to_pfn(page) ((unsigned long) (page - mem_map))
112 # define pfn_to_page(pfn) (mem_map + (pfn))
114 extern struct page *vmem_map;
115 extern unsigned long max_low_pfn;
116 # define pfn_valid(pfn) (((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
117 # define page_to_pfn(page) ((unsigned long) (page - vmem_map))
118 # define pfn_to_page(pfn) (vmem_map + (pfn))
121 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
122 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
124 typedef union ia64_va {
126 unsigned long off : 61; /* intra-region offset */
127 unsigned long reg : 3; /* region number */
134 * Note: These macros depend on the fact that PAGE_OFFSET has all
135 * region bits set to 1 and all other bits set to zero. They are
136 * expressed in this way to ensure they result in a single "dep"
139 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
140 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
142 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
143 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
145 #ifdef CONFIG_HUGETLB_PAGE
146 # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
147 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
148 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
149 # define is_hugepage_only_range(mm, addr, len) \
150 (REGION_NUMBER(addr) == RGN_HPAGE && \
151 REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
152 extern unsigned int hpage_shift;
155 static __inline__ int
156 get_order (unsigned long size)
158 long double d = size - 1;
161 order = ia64_getf_exp(d);
162 order = order - PAGE_SHIFT - 0xffff + 1;
168 # endif /* __KERNEL__ */
169 #endif /* !__ASSEMBLY__ */
171 #ifdef STRICT_MM_TYPECHECKS
173 * These are used to make use of C type-checking..
175 typedef struct { unsigned long pte; } pte_t;
176 typedef struct { unsigned long pmd; } pmd_t;
177 typedef struct { unsigned long pgd; } pgd_t;
178 typedef struct { unsigned long pgprot; } pgprot_t;
180 # define pte_val(x) ((x).pte)
181 # define pmd_val(x) ((x).pmd)
182 # define pgd_val(x) ((x).pgd)
183 # define pgprot_val(x) ((x).pgprot)
185 # define __pte(x) ((pte_t) { (x) } )
186 # define __pgprot(x) ((pgprot_t) { (x) } )
188 #else /* !STRICT_MM_TYPECHECKS */
190 * .. while these make it easier on the compiler
192 # ifndef __ASSEMBLY__
193 typedef unsigned long pte_t;
194 typedef unsigned long pmd_t;
195 typedef unsigned long pgd_t;
196 typedef unsigned long pgprot_t;
199 # define pte_val(x) (x)
200 # define pmd_val(x) (x)
201 # define pgd_val(x) (x)
202 # define pgprot_val(x) (x)
204 # define __pte(x) (x)
205 # define __pgd(x) (x)
206 # define __pgprot(x) (x)
207 #endif /* !STRICT_MM_TYPECHECKS */
209 #define PAGE_OFFSET RGN_BASE(RGN_KERNEL)
211 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
212 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
213 (((current->personality & READ_IMPLIES_EXEC) != 0) \
216 #endif /* _ASM_IA64_PAGE_H */