File: /usr/src/linux/include/asm-sparc/page.h
1 /* $Id: page.h,v 1.55 2000/10/30 21:01:41 davem Exp $
2 * page.h: Various defines and such for MMU operations on the Sparc for
3 * the Linux kernel.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8 #ifndef _SPARC_PAGE_H
9 #define _SPARC_PAGE_H
10
11 #include <linux/config.h>
12 #ifdef CONFIG_SUN4
13 #define PAGE_SHIFT 13
14 #else
15 #define PAGE_SHIFT 12
16 #endif
17 #ifndef __ASSEMBLY__
18 /* I have my suspicions... -DaveM */
19 #define PAGE_SIZE (1UL << PAGE_SHIFT)
20 #else
21 #define PAGE_SIZE (1 << PAGE_SHIFT)
22 #endif
23 #define PAGE_MASK (~(PAGE_SIZE-1))
24
25 #ifdef __KERNEL__
26
27 #include <asm/head.h> /* for KERNBASE */
28 #include <asm/btfixup.h>
29
30 /* This is always 2048*sizeof(long), doesn't change with PAGE_SIZE */
31 #define TASK_UNION_SIZE 8192
32
33 #ifndef __ASSEMBLY__
34
35 /*
36 * XXX I am hitting compiler bugs with __builtin_trap. This has
37 * hit me before and rusty was blaming his netfilter bugs on
38 * this so lets disable it. - Anton
39 */
40 #if 0
41 /* We need the mb()'s so we don't trigger a compiler bug - Anton */
42 #define BUG() do { \
43 mb(); \
44 __builtin_trap(); \
45 mb(); \
46 } while(0)
47 #else
48 #define BUG() do { \
49 printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; \
50 } while (0)
51 #endif
52
53 #define PAGE_BUG(page) BUG()
54
55 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
56 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
57 #define clear_user_page(page, vaddr) clear_page(page)
58 #define copy_user_page(to, from, vaddr) copy_page(to, from)
59
60 /* The following structure is used to hold the physical
61 * memory configuration of the machine. This is filled in
62 * probe_memory() and is later used by mem_init() to set up
63 * mem_map[]. We statically allocate SPARC_PHYS_BANKS of
64 * these structs, this is arbitrary. The entry after the
65 * last valid one has num_bytes==0.
66 */
67
68 struct sparc_phys_banks {
69 unsigned long base_addr;
70 unsigned long num_bytes;
71 };
72
73 #define SPARC_PHYS_BANKS 32
74
75 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS];
76
77 /* Cache alias structure. Entry is valid if context != -1. */
78 struct cache_palias {
79 unsigned long vaddr;
80 int context;
81 };
82
83 extern struct cache_palias *sparc_aliases;
84
85 /* passing structs on the Sparc slow us down tremendously... */
86
87 /* #define STRICT_MM_TYPECHECKS */
88
89 #ifdef STRICT_MM_TYPECHECKS
90 /*
91 * These are used to make use of C type-checking..
92 */
93 typedef struct { unsigned long pte; } pte_t;
94 typedef struct { unsigned long iopte; } iopte_t;
95 typedef struct { unsigned long pmd; } pmd_t;
96 typedef struct { unsigned long pgd; } pgd_t;
97 typedef struct { unsigned long ctxd; } ctxd_t;
98 typedef struct { unsigned long pgprot; } pgprot_t;
99 typedef struct { unsigned long iopgprot; } iopgprot_t;
100
101 #define pte_val(x) ((x).pte)
102 #define iopte_val(x) ((x).iopte)
103 #define pmd_val(x) ((x).pmd)
104 #define pgd_val(x) ((x).pgd)
105 #define ctxd_val(x) ((x).ctxd)
106 #define pgprot_val(x) ((x).pgprot)
107 #define iopgprot_val(x) ((x).iopgprot)
108
109 #define __pte(x) ((pte_t) { (x) } )
110 #define __iopte(x) ((iopte_t) { (x) } )
111 #define __pmd(x) ((pmd_t) { (x) } )
112 #define __pgd(x) ((pgd_t) { (x) } )
113 #define __ctxd(x) ((ctxd_t) { (x) } )
114 #define __pgprot(x) ((pgprot_t) { (x) } )
115 #define __iopgprot(x) ((iopgprot_t) { (x) } )
116
117 #else
118 /*
119 * .. while these make it easier on the compiler
120 */
121 typedef unsigned long pte_t;
122 typedef unsigned long iopte_t;
123 typedef unsigned long pmd_t;
124 typedef unsigned long pgd_t;
125 typedef unsigned long ctxd_t;
126 typedef unsigned long pgprot_t;
127 typedef unsigned long iopgprot_t;
128
129 #define pte_val(x) (x)
130 #define iopte_val(x) (x)
131 #define pmd_val(x) (x)
132 #define pgd_val(x) (x)
133 #define ctxd_val(x) (x)
134 #define pgprot_val(x) (x)
135 #define iopgprot_val(x) (x)
136
137 #define __pte(x) (x)
138 #define __iopte(x) (x)
139 #define __pmd(x) (x)
140 #define __pgd(x) (x)
141 #define __ctxd(x) (x)
142 #define __pgprot(x) (x)
143 #define __iopgprot(x) (x)
144
145 #endif
146
147 extern unsigned long sparc_unmapped_base;
148
149 BTFIXUPDEF_SETHI(sparc_unmapped_base)
150
151 #define TASK_UNMAPPED_BASE BTFIXUP_SETHI(sparc_unmapped_base)
152
153 /* Pure 2^n version of get_order */
154 extern __inline__ int get_order(unsigned long size)
155 {
156 int order;
157
158 size = (size-1) >> (PAGE_SHIFT-1);
159 order = -1;
160 do {
161 size >>= 1;
162 order++;
163 } while (size);
164 return order;
165 }
166
167 #else /* !(__ASSEMBLY__) */
168
169 #define __pgprot(x) (x)
170
171 #endif /* !(__ASSEMBLY__) */
172
173 /* to align the pointer to the (next) page boundary */
174 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
175
176 #define PAGE_OFFSET 0xf0000000
177 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
178 #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
179 #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
180 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
181
182 #endif /* __KERNEL__ */
183
184 #endif /* _SPARC_PAGE_H */
185