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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11#include <asm/intrinsics.h>
12#include <asm/types.h>
13
14/*
Peter Chubb0a41e252005-08-16 19:54:00 -070015 * The top three bits of an IA64 address are its Region Number.
16 * Different regions are assigned to different purposes.
17 */
18#define RGN_SHIFT (61)
Greg Edwards1b667762005-08-22 09:57:00 -070019#define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
20#define RGN_BITS (RGN_BASE(-1))
Peter Chubb0a41e252005-08-16 19:54:00 -070021
Peter Chubb0a41e252005-08-16 19:54:00 -070022#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 */
26
27/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 * PAGE_SHIFT determines the actual kernel page size.
29 */
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
38#else
39# error Unsupported page size!
40#endif
41
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)
45
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)
48
Peter Chubb0a41e252005-08-16 19:54:00 -070049
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#ifdef CONFIG_HUGETLB_PAGE
Peter Chubb0a41e252005-08-16 19:54:00 -070051# define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052# 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))
56
57# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
58# define ARCH_HAS_HUGEPAGE_ONLY_RANGE
David Gibson42b88be2006-03-22 00:09:01 -080059# define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
David Gibson9da61ae2006-03-22 00:08:57 -080060# define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#endif /* CONFIG_HUGETLB_PAGE */
62
63#ifdef __ASSEMBLY__
64# define __pa(x) ((x) - PAGE_OFFSET)
65# define __va(x) ((x) + PAGE_OFFSET)
66#else /* !__ASSEMBLY */
67# ifdef __KERNEL__
68# 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);
Bob Picco1be7d992005-10-04 15:13:50 -0400104#elif defined(CONFIG_FLATMEM)
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))
113#endif
114#endif
115
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>
119#endif
120
Bob Picco1be7d992005-10-04 15:13:50 -0400121#ifdef CONFIG_FLATMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122# define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
Bob Picco1be7d992005-10-04 15:13:50 -0400123#elif defined(CONFIG_DISCONTIGMEM)
Dean Roeb77dae52005-11-09 14:25:06 -0600124extern unsigned long min_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125extern unsigned long max_low_pfn;
Dean Roeb77dae52005-11-09 14:25:06 -0600126# define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127#endif
128
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)
Bob Picco631bb0e2005-10-31 13:25:25 -0500131#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133typedef union ia64_va {
134 struct {
135 unsigned long off : 61; /* intra-region offset */
136 unsigned long reg : 3; /* region number */
137 } f;
138 unsigned long l;
139 void *p;
140} ia64_va;
141
142/*
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"
146 * instruction.
147 */
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;})
150
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;})
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154#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) \
Chen, Kenneth W2332c9a2006-03-22 10:49:00 -0800159 (REGION_NUMBER(addr) == RGN_HPAGE || \
Peter Chubb0a41e252005-08-16 19:54:00 -0700160 REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161extern unsigned int hpage_shift;
162#endif
163
164static __inline__ int
165get_order (unsigned long size)
166{
167 long double d = size - 1;
168 long order;
169
170 order = ia64_getf_exp(d);
171 order = order - PAGE_SHIFT - 0xffff + 1;
172 if (order < 0)
173 order = 0;
174 return order;
175}
176
177# endif /* __KERNEL__ */
178#endif /* !__ASSEMBLY__ */
179
180#ifdef STRICT_MM_TYPECHECKS
181 /*
182 * These are used to make use of C type-checking..
183 */
184 typedef struct { unsigned long pte; } pte_t;
185 typedef struct { unsigned long pmd; } pmd_t;
Robin Holt837cd0b2005-11-11 09:35:43 -0600186#ifdef CONFIG_PGTABLE_4
187 typedef struct { unsigned long pud; } pud_t;
188#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 typedef struct { unsigned long pgd; } pgd_t;
190 typedef struct { unsigned long pgprot; } pgprot_t;
191
192# define pte_val(x) ((x).pte)
193# define pmd_val(x) ((x).pmd)
Robin Holt837cd0b2005-11-11 09:35:43 -0600194#ifdef CONFIG_PGTABLE_4
195# define pud_val(x) ((x).pud)
196#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197# define pgd_val(x) ((x).pgd)
198# define pgprot_val(x) ((x).pgprot)
199
200# define __pte(x) ((pte_t) { (x) } )
201# define __pgprot(x) ((pgprot_t) { (x) } )
202
203#else /* !STRICT_MM_TYPECHECKS */
204 /*
205 * .. while these make it easier on the compiler
206 */
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;
212# endif
213
214# define pte_val(x) (x)
215# define pmd_val(x) (x)
216# define pgd_val(x) (x)
217# define pgprot_val(x) (x)
218
219# define __pte(x) (x)
220# define __pgd(x) (x)
221# define __pgprot(x) (x)
222#endif /* !STRICT_MM_TYPECHECKS */
223
Peter Chubb0a41e252005-08-16 19:54:00 -0700224#define PAGE_OFFSET RGN_BASE(RGN_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
227 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
228 (((current->personality & READ_IMPLIES_EXEC) != 0) \
229 ? VM_EXEC : 0))
230
231#endif /* _ASM_IA64_PAGE_H */