1#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
10#include <asm/intrinsics.h>
11#include <asm/types.h>
12
13/*
14 * The top three bits of an IA64 address are its Region Number.
15 * Different regions are assigned to different purposes.
16 */
17#define RGN_SHIFT	(61)
18#define RGN_BASE(r)	(__IA64_UL_CONST(r)<<RGN_SHIFT)
19#define RGN_BITS	(RGN_BASE(-1))
20
21#define RGN_KERNEL	7	/* Identity mapped region */
22#define RGN_UNCACHED    6	/* Identity mapped I/O region */
23#define RGN_GATE	5	/* Gate page, Kernel text, etc */
24#define RGN_HPAGE	4	/* For Huge TLB pages */
25
26/*
27 * PAGE_SHIFT determines the actual kernel page size.
28 */
29#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
30# define PAGE_SHIFT	12
31#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
32# define PAGE_SHIFT	13
33#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
34# define PAGE_SHIFT	14
35#elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
36# define PAGE_SHIFT	16
37#else
38# error Unsupported page size!
39#endif
40
41#define PAGE_SIZE		(__IA64_UL_CONST(1) << PAGE_SHIFT)
42#define PAGE_MASK		(~(PAGE_SIZE - 1))
43
44#define PERCPU_PAGE_SHIFT	18	/* log2() of max. size of per-CPU area */
45#define PERCPU_PAGE_SIZE	(__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
46
47
48#ifdef CONFIG_HUGETLB_PAGE
49# define HPAGE_REGION_BASE	RGN_BASE(RGN_HPAGE)
50# define HPAGE_SHIFT		hpage_shift
51# define HPAGE_SHIFT_DEFAULT	28	/* check ia64 SDM for architecture supported size */
52# define HPAGE_SIZE		(__IA64_UL_CONST(1) << HPAGE_SHIFT)
53# define HPAGE_MASK		(~(HPAGE_SIZE - 1))
54
55# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
56#endif /* CONFIG_HUGETLB_PAGE */
57
58#ifdef __ASSEMBLY__
59# define __pa(x)		((x) - PAGE_OFFSET)
60# define __va(x)		((x) + PAGE_OFFSET)
61#else /* !__ASSEMBLY */
62#  define STRICT_MM_TYPECHECKS
63
64extern void clear_page (void *page);
65extern void copy_page (void *to, void *from);
66
67/*
68 * clear_user_page() and copy_user_page() can't be inline functions because
69 * flush_dcache_page() can't be defined until later...
70 */
71#define clear_user_page(addr, vaddr, page)	\
72do {						\
73	clear_page(addr);			\
74	flush_dcache_page(page);		\
75} while (0)
76
77#define copy_user_page(to, from, vaddr, page)	\
78do {						\
79	copy_page((to), (from));		\
80	flush_dcache_page(page);		\
81} while (0)
82
83
84#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr)		\
85({									\
86	struct page *page = alloc_page_vma(				\
87		GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr);	\
88	if (page)							\
89 		flush_dcache_page(page);				\
90	page;								\
91})
92
93#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
94
95#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
96
97#ifdef CONFIG_VIRTUAL_MEM_MAP
98extern int ia64_pfn_valid (unsigned long pfn);
99#else
100# define ia64_pfn_valid(pfn) 1
101#endif
102
103#ifdef CONFIG_VIRTUAL_MEM_MAP
104extern struct page *vmem_map;
105#ifdef CONFIG_DISCONTIGMEM
106# define page_to_pfn(page)	((unsigned long) (page - vmem_map))
107# define pfn_to_page(pfn)	(vmem_map + (pfn))
108#else
109# include <asm-generic/memory_model.h>
110#endif
111#else
112# include <asm-generic/memory_model.h>
113#endif
114
115#ifdef CONFIG_FLATMEM
116# define pfn_valid(pfn)		(((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
117#elif defined(CONFIG_DISCONTIGMEM)
118extern unsigned long min_low_pfn;
119extern unsigned long max_low_pfn;
120# define pfn_valid(pfn)		(((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
121#endif
122
123#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
124#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
125#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
126
127typedef union ia64_va {
128	struct {
129		unsigned long off : 61;		/* intra-region offset */
130		unsigned long reg :  3;		/* region number */
131	} f;
132	unsigned long l;
133	void *p;
134} ia64_va;
135
136/*
137 * Note: These macros depend on the fact that PAGE_OFFSET has all
138 * region bits set to 1 and all other bits set to zero.  They are
139 * expressed in this way to ensure they result in a single "dep"
140 * instruction.
141 */
142#define __pa(x)		({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
143#define __va(x)		({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
144
145#define REGION_NUMBER(x)	({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
146#define REGION_OFFSET(x)	({ia64_va _v; _v.l = (long) (x); _v.f.off;})
147
148#ifdef CONFIG_HUGETLB_PAGE
149# define htlbpage_to_page(x)	(((unsigned long) REGION_NUMBER(x) << 61)			\
150				 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
151# define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
152extern unsigned int hpage_shift;
153#endif
154
155static __inline__ int
156get_order (unsigned long size)
157{
158	long double d = size - 1;
159	long order;
160
161	order = ia64_getf_exp(d);
162	order = order - PAGE_SHIFT - 0xffff + 1;
163	if (order < 0)
164		order = 0;
165	return order;
166}
167
168#endif /* !__ASSEMBLY__ */
169
170#ifdef STRICT_MM_TYPECHECKS
171  /*
172   * These are used to make use of C type-checking..
173   */
174  typedef struct { unsigned long pte; } pte_t;
175  typedef struct { unsigned long pmd; } pmd_t;
176#if CONFIG_PGTABLE_LEVELS == 4
177  typedef struct { unsigned long pud; } pud_t;
178#endif
179  typedef struct { unsigned long pgd; } pgd_t;
180  typedef struct { unsigned long pgprot; } pgprot_t;
181  typedef struct page *pgtable_t;
182
183# define pte_val(x)	((x).pte)
184# define pmd_val(x)	((x).pmd)
185#if CONFIG_PGTABLE_LEVELS == 4
186# define pud_val(x)	((x).pud)
187#endif
188# define pgd_val(x)	((x).pgd)
189# define pgprot_val(x)	((x).pgprot)
190
191# define __pte(x)	((pte_t) { (x) } )
192# define __pmd(x)	((pmd_t) { (x) } )
193# define __pgprot(x)	((pgprot_t) { (x) } )
194
195#else /* !STRICT_MM_TYPECHECKS */
196  /*
197   * .. while these make it easier on the compiler
198   */
199# ifndef __ASSEMBLY__
200    typedef unsigned long pte_t;
201    typedef unsigned long pmd_t;
202    typedef unsigned long pgd_t;
203    typedef unsigned long pgprot_t;
204    typedef struct page *pgtable_t;
205# endif
206
207# define pte_val(x)	(x)
208# define pmd_val(x)	(x)
209# define pgd_val(x)	(x)
210# define pgprot_val(x)	(x)
211
212# define __pte(x)	(x)
213# define __pgd(x)	(x)
214# define __pgprot(x)	(x)
215#endif /* !STRICT_MM_TYPECHECKS */
216
217#define PAGE_OFFSET			RGN_BASE(RGN_KERNEL)
218
219#define VM_DATA_DEFAULT_FLAGS		(VM_READ | VM_WRITE |					\
220					 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |		\
221					 (((current->personality & READ_IMPLIES_EXEC) != 0)	\
222					  ? VM_EXEC : 0))
223
224#define GATE_ADDR		RGN_BASE(RGN_GATE)
225
226/*
227 * 0xa000000000000000+2*PERCPU_PAGE_SIZE
228 * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page)
229 */
230#define KERNEL_START		 (GATE_ADDR+__IA64_UL_CONST(0x100000000))
231#define PERCPU_ADDR		(-PERCPU_PAGE_SIZE)
232#define LOAD_OFFSET		(KERNEL_START - KERNEL_TR_PAGE_SIZE)
233
234#define __HAVE_ARCH_GATE_AREA	1
235
236#endif /* _ASM_IA64_PAGE_H */
237