1 #ifndef _ASM_IA64_PAGE_H
2 #define _ASM_IA64_PAGE_H
3 /*
4 * Pagetable related stuff.
5 *
6 * Copyright (C) 1998, 1999 Hewlett-Packard Co
7 * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
8 */
9
10 #include <linux/config.h>
11
12 #include <asm/types.h>
13
14 /*
15 * PAGE_SHIFT determines the actual kernel page size.
16 */
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
25 #else
26 # error Unsupported page size!
27 #endif
28
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)
32
33 #ifdef __ASSEMBLY__
34 # define __pa(x) ((x) - PAGE_OFFSET)
35 # define __va(x) ((x) + PAGE_OFFSET)
36 #else /* !__ASSEMBLY */
37 # ifdef __KERNEL__
38 # define STRICT_MM_TYPECHECKS
39
40 extern void clear_page (void *page);
41 extern void copy_page (void *to, void *from);
42
43 # ifdef STRICT_MM_TYPECHECKS
44 /*
45 * These are used to make use of C type-checking..
46 */
47 typedef struct { unsigned long pte; } pte_t;
48 typedef struct { unsigned long pmd; } pmd_t;
49 typedef struct { unsigned long pgd; } pgd_t;
50 typedef struct { unsigned long pgprot; } pgprot_t;
51
52 #define pte_val(x) ((x).pte)
53 #define pmd_val(x) ((x).pmd)
54 #define pgd_val(x) ((x).pgd)
55 #define pgprot_val(x) ((x).pgprot)
56
57 #define __pte(x) ((pte_t) { (x) } )
58 #define __pgprot(x) ((pgprot_t) { (x) } )
59
60 # else /* !STRICT_MM_TYPECHECKS */
61 /*
62 * .. while these make it easier on the compiler
63 */
64 typedef unsigned long pte_t;
65 typedef unsigned long pmd_t;
66 typedef unsigned long pgd_t;
67 typedef unsigned long pgprot_t;
68
69 #define pte_val(x) (x)
70 #define pmd_val(x) (x)
71 #define pgd_val(x) (x)
72 #define pgprot_val(x) (x)
73
74 #define __pte(x) (x)
75 #define __pgd(x) (x)
76 #define __pgprot(x) (x)
77
78 # endif /* !STRICT_MM_TYPECHECKS */
79
80 /*
81 * Note: the MAP_NR_*() macro can't use __pa() because MAP_NR_*(X) MUST
82 * map to something >= max_mapnr if X is outside the identity mapped
83 * kernel space.
84 */
85
86 /*
87 * The dense variant can be used as long as the size of memory holes isn't
88 * very big.
89 */
90 #define MAP_NR_DENSE(addr) (((unsigned long) (addr) - PAGE_OFFSET) >> PAGE_SHIFT)
91
92 #ifdef CONFIG_IA64_GENERIC
93 # include <asm/machvec.h>
94 # define virt_to_page(kaddr) (mem_map + platform_map_nr(kaddr))
95 #elif defined (CONFIG_IA64_SGI_SN1)
96 # ifndef CONFIG_DISCONTIGMEM
97 # define virt_to_page(kaddr) (mem_map + MAP_NR_DENSE(kaddr))
98 # endif
99 #else
100 # define virt_to_page(kaddr) (mem_map + MAP_NR_DENSE(kaddr))
101 #endif
102 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
103
104 typedef union ia64_va {
105 struct {
106 unsigned long off : 61; /* intra-region offset */
107 unsigned long reg : 3; /* region number */
108 } f;
109 unsigned long l;
110 void *p;
111 } ia64_va;
112
113 /*
114 * Note: These macros depend on the fact that PAGE_OFFSET has all
115 * region bits set to 1 and all other bits set to zero. They are
116 * expressed in this way to ensure they result in a single "dep"
117 * instruction.
118 */
119 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
120 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
121
122 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
123 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
124
125 #define REGION_SIZE REGION_NUMBER(1)
126 #define REGION_KERNEL 7
127
128 #define BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; } while (0)
129 #define PAGE_BUG(page) do { BUG(); } while (0)
130
131 static __inline__ int
132 get_order (unsigned long size)
133 {
134 double d = size - 1;
135 long order;
136
137 __asm__ ("getf.exp %0=%1" : "=r"(order) : "f"(d));
138 order = order - PAGE_SHIFT - 0xffff + 1;
139 if (order < 0)
140 order = 0;
141 return order;
142 }
143
144 # endif /* __KERNEL__ */
145 #endif /* !ASSEMBLY */
146
147 #define PAGE_OFFSET 0xe000000000000000
148
149 #endif /* _ASM_IA64_PAGE_H */
150
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