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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
David Woodhoused5759642006-09-16 12:15:47 -070010# ifdef __KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
12#include <asm/intrinsics.h>
13#include <asm/types.h>
14
15/*
Peter Chubb0a41e252005-08-16 19:54:00 -070016 * The top three bits of an IA64 address are its Region Number.
17 * Different regions are assigned to different purposes.
18 */
19#define RGN_SHIFT (61)
Greg Edwards1b667762005-08-22 09:57:00 -070020#define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
21#define RGN_BITS (RGN_BASE(-1))
Peter Chubb0a41e252005-08-16 19:54:00 -070022
Peter Chubb0a41e252005-08-16 19:54:00 -070023#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 */
27
28/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 * PAGE_SHIFT determines the actual kernel page size.
30 */
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
39#else
40# error Unsupported page size!
41#endif
42
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)
46
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)
49
Peter Chubb0a41e252005-08-16 19:54:00 -070050
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#ifdef CONFIG_HUGETLB_PAGE
Peter Chubb0a41e252005-08-16 19:54:00 -070052# define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053# define HPAGE_SHIFT hpage_shift
54# define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */
55# define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
56# define HPAGE_MASK (~(HPAGE_SIZE - 1))
57
58# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
59# define ARCH_HAS_HUGEPAGE_ONLY_RANGE
David Gibson42b88be2006-03-22 00:09:01 -080060# define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
David Gibson9da61ae2006-03-22 00:08:57 -080061# define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#endif /* CONFIG_HUGETLB_PAGE */
63
64#ifdef __ASSEMBLY__
65# define __pa(x) ((x) - PAGE_OFFSET)
66# define __va(x) ((x) + PAGE_OFFSET)
67#else /* !__ASSEMBLY */
Linus Torvalds1da177e2005-04-16 15:20:36 -070068# define STRICT_MM_TYPECHECKS
69
70extern void clear_page (void *page);
71extern void copy_page (void *to, void *from);
72
73/*
74 * clear_user_page() and copy_user_page() can't be inline functions because
75 * flush_dcache_page() can't be defined until later...
76 */
77#define clear_user_page(addr, vaddr, page) \
78do { \
79 clear_page(addr); \
80 flush_dcache_page(page); \
81} while (0)
82
83#define copy_user_page(to, from, vaddr, page) \
84do { \
85 copy_page((to), (from)); \
86 flush_dcache_page(page); \
87} while (0)
88
89
90#define alloc_zeroed_user_highpage(vma, vaddr) \
91({ \
92 struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \
93 if (page) \
94 flush_dcache_page(page); \
95 page; \
96})
97
98#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
99
100#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
101
102#ifdef CONFIG_VIRTUAL_MEM_MAP
103extern int ia64_pfn_valid (unsigned long pfn);
Matthew Wilcoxb0f40ea2006-11-16 13:40:53 -0700104#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105# define ia64_pfn_valid(pfn) 1
106#endif
107
KAMEZAWA Hiroyuki0ecd7022006-03-27 01:15:53 -0800108#ifdef CONFIG_VIRTUAL_MEM_MAP
109extern 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))
Matthew Wilcoxb0f40ea2006-11-16 13:40:53 -0700113#else
114# include <asm-generic/memory_model.h>
KAMEZAWA Hiroyuki0ecd7022006-03-27 01:15:53 -0800115#endif
Matthew Wilcoxb0f40ea2006-11-16 13:40:53 -0700116#else
117# include <asm-generic/memory_model.h>
KAMEZAWA Hiroyuki0ecd7022006-03-27 01:15:53 -0800118#endif
119
Bob Picco1be7d992005-10-04 15:13:50 -0400120#ifdef CONFIG_FLATMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121# define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
Bob Picco1be7d992005-10-04 15:13:50 -0400122#elif defined(CONFIG_DISCONTIGMEM)
Dean Roeb77dae52005-11-09 14:25:06 -0600123extern unsigned long min_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124extern unsigned long max_low_pfn;
Dean Roeb77dae52005-11-09 14:25:06 -0600125# define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126#endif
127
128#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
129#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
Bob Picco631bb0e2005-10-31 13:25:25 -0500130#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
132typedef union ia64_va {
133 struct {
134 unsigned long off : 61; /* intra-region offset */
135 unsigned long reg : 3; /* region number */
136 } f;
137 unsigned long l;
138 void *p;
139} ia64_va;
140
141/*
142 * Note: These macros depend on the fact that PAGE_OFFSET has all
143 * region bits set to 1 and all other bits set to zero. They are
144 * expressed in this way to ensure they result in a single "dep"
145 * instruction.
146 */
147#define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
148#define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
149
150#define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
151#define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153#ifdef CONFIG_HUGETLB_PAGE
154# define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
155 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
156# define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
157# define is_hugepage_only_range(mm, addr, len) \
Chen, Kenneth W2332c9a2006-03-22 10:49:00 -0800158 (REGION_NUMBER(addr) == RGN_HPAGE || \
Peter Chubb0a41e252005-08-16 19:54:00 -0700159 REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160extern unsigned int hpage_shift;
161#endif
162
163static __inline__ int
164get_order (unsigned long size)
165{
166 long double d = size - 1;
167 long order;
168
169 order = ia64_getf_exp(d);
170 order = order - PAGE_SHIFT - 0xffff + 1;
171 if (order < 0)
172 order = 0;
173 return order;
174}
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176#endif /* !__ASSEMBLY__ */
177
178#ifdef STRICT_MM_TYPECHECKS
179 /*
180 * These are used to make use of C type-checking..
181 */
182 typedef struct { unsigned long pte; } pte_t;
183 typedef struct { unsigned long pmd; } pmd_t;
Robin Holt837cd0b2005-11-11 09:35:43 -0600184#ifdef CONFIG_PGTABLE_4
185 typedef struct { unsigned long pud; } pud_t;
186#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 typedef struct { unsigned long pgd; } pgd_t;
188 typedef struct { unsigned long pgprot; } pgprot_t;
189
190# define pte_val(x) ((x).pte)
191# define pmd_val(x) ((x).pmd)
Robin Holt837cd0b2005-11-11 09:35:43 -0600192#ifdef CONFIG_PGTABLE_4
193# define pud_val(x) ((x).pud)
194#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195# define pgd_val(x) ((x).pgd)
196# define pgprot_val(x) ((x).pgprot)
197
198# define __pte(x) ((pte_t) { (x) } )
199# define __pgprot(x) ((pgprot_t) { (x) } )
200
201#else /* !STRICT_MM_TYPECHECKS */
202 /*
203 * .. while these make it easier on the compiler
204 */
205# ifndef __ASSEMBLY__
206 typedef unsigned long pte_t;
207 typedef unsigned long pmd_t;
208 typedef unsigned long pgd_t;
209 typedef unsigned long pgprot_t;
210# endif
211
212# define pte_val(x) (x)
213# define pmd_val(x) (x)
214# define pgd_val(x) (x)
215# define pgprot_val(x) (x)
216
217# define __pte(x) (x)
218# define __pgd(x) (x)
219# define __pgprot(x) (x)
220#endif /* !STRICT_MM_TYPECHECKS */
221
Peter Chubb0a41e252005-08-16 19:54:00 -0700222#define PAGE_OFFSET RGN_BASE(RGN_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
225 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
226 (((current->personality & READ_IMPLIES_EXEC) != 0) \
227 ? VM_EXEC : 0))
228
David Woodhoused5759642006-09-16 12:15:47 -0700229# endif /* __KERNEL__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230#endif /* _ASM_IA64_PAGE_H */