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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#ifdef CONFIG_SUN4
12#define PAGE_SHIFT 13
13#else
14#define PAGE_SHIFT 12
15#endif
16#ifndef __ASSEMBLY__
17/* I have my suspicions... -DaveM */
18#define PAGE_SIZE (1UL << PAGE_SHIFT)
19#else
20#define PAGE_SIZE (1 << PAGE_SHIFT)
21#endif
22#define PAGE_MASK (~(PAGE_SIZE-1))
23
24#ifdef __KERNEL__
25
26#include <asm/btfixup.h>
27
28#ifndef __ASSEMBLY__
29
30#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
31#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
32#define clear_user_page(addr, vaddr, page) \
33 do { clear_page(addr); \
34 sparc_flush_page_to_ram(page); \
35 } while (0)
36#define copy_user_page(to, from, vaddr, page) \
37 do { copy_page(to, from); \
38 sparc_flush_page_to_ram(page); \
39 } while (0)
40
41/* The following structure is used to hold the physical
42 * memory configuration of the machine. This is filled in
43 * probe_memory() and is later used by mem_init() to set up
44 * mem_map[]. We statically allocate SPARC_PHYS_BANKS of
45 * these structs, this is arbitrary. The entry after the
46 * last valid one has num_bytes==0.
47 */
48
49struct sparc_phys_banks {
50 unsigned long base_addr;
51 unsigned long num_bytes;
52};
53
54#define SPARC_PHYS_BANKS 32
55
56extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
57
58/* Cache alias structure. Entry is valid if context != -1. */
59struct cache_palias {
60 unsigned long vaddr;
61 int context;
62};
63
64extern struct cache_palias *sparc_aliases;
65
66/* passing structs on the Sparc slow us down tremendously... */
67
68/* #define STRICT_MM_TYPECHECKS */
69
70#ifdef STRICT_MM_TYPECHECKS
71/*
72 * These are used to make use of C type-checking..
73 */
74typedef struct { unsigned long pte; } pte_t;
75typedef struct { unsigned long iopte; } iopte_t;
76typedef struct { unsigned long pmdv[16]; } pmd_t;
77typedef struct { unsigned long pgd; } pgd_t;
78typedef struct { unsigned long ctxd; } ctxd_t;
79typedef struct { unsigned long pgprot; } pgprot_t;
80typedef struct { unsigned long iopgprot; } iopgprot_t;
81
82#define pte_val(x) ((x).pte)
83#define iopte_val(x) ((x).iopte)
84#define pmd_val(x) ((x).pmdv[0])
85#define pgd_val(x) ((x).pgd)
86#define ctxd_val(x) ((x).ctxd)
87#define pgprot_val(x) ((x).pgprot)
88#define iopgprot_val(x) ((x).iopgprot)
89
90#define __pte(x) ((pte_t) { (x) } )
91#define __iopte(x) ((iopte_t) { (x) } )
92/* #define __pmd(x) ((pmd_t) { (x) } ) */ /* XXX procedure with loop */
93#define __pgd(x) ((pgd_t) { (x) } )
94#define __ctxd(x) ((ctxd_t) { (x) } )
95#define __pgprot(x) ((pgprot_t) { (x) } )
96#define __iopgprot(x) ((iopgprot_t) { (x) } )
97
98#else
99/*
100 * .. while these make it easier on the compiler
101 */
102typedef unsigned long pte_t;
103typedef unsigned long iopte_t;
104typedef struct { unsigned long pmdv[16]; } pmd_t;
105typedef unsigned long pgd_t;
106typedef unsigned long ctxd_t;
107typedef unsigned long pgprot_t;
108typedef unsigned long iopgprot_t;
109
110#define pte_val(x) (x)
111#define iopte_val(x) (x)
112#define pmd_val(x) ((x).pmdv[0])
113#define pgd_val(x) (x)
114#define ctxd_val(x) (x)
115#define pgprot_val(x) (x)
116#define iopgprot_val(x) (x)
117
118#define __pte(x) (x)
119#define __iopte(x) (x)
120/* #define __pmd(x) (x) */ /* XXX later */
121#define __pgd(x) (x)
122#define __ctxd(x) (x)
123#define __pgprot(x) (x)
124#define __iopgprot(x) (x)
125
126#endif
127
128extern unsigned long sparc_unmapped_base;
129
130BTFIXUPDEF_SETHI(sparc_unmapped_base)
131
132#define TASK_UNMAPPED_BASE BTFIXUP_SETHI(sparc_unmapped_base)
133
134#else /* !(__ASSEMBLY__) */
135
136#define __pgprot(x) (x)
137
138#endif /* !(__ASSEMBLY__) */
139
140/* to align the pointer to the (next) page boundary */
141#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
142
143#define PAGE_OFFSET 0xf0000000
144#ifndef __ASSEMBLY__
145extern unsigned long phys_base;
146extern unsigned long pfn_base;
147#endif
148#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + phys_base)
149#define __va(x) ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
150
151#define virt_to_phys __pa
152#define phys_to_virt __va
153
154#define ARCH_PFN_OFFSET (pfn_base)
155#define virt_to_page(kaddr) (mem_map + ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT)))
156
157#define pfn_valid(pfn) (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
158#define virt_addr_valid(kaddr) ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
159
160#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
161 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
162
163#endif /* __KERNEL__ */
164
165#include <asm-generic/memory_model.h>
166#include <asm-generic/page.h>
167
168#endif /* _SPARC_PAGE_H */