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page_32.h
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1 /*
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 ([email protected])
6  */
7 
8 #ifndef _SPARC_PAGE_H
9 #define _SPARC_PAGE_H
10 
11 #include <linux/const.h>
12 
13 #define PAGE_SHIFT 12
14 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
15 #define PAGE_MASK (~(PAGE_SIZE-1))
16 
17 #ifndef __ASSEMBLY__
18 
19 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
20 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
21 #define clear_user_page(addr, vaddr, page) \
22  do { clear_page(addr); \
23  sparc_flush_page_to_ram(page); \
24  } while (0)
25 #define copy_user_page(to, from, vaddr, page) \
26  do { copy_page(to, from); \
27  sparc_flush_page_to_ram(page); \
28  } while (0)
29 
30 /* The following structure is used to hold the physical
31  * memory configuration of the machine. This is filled in
32  * prom_meminit() and is later used by mem_init() to set up
33  * mem_map[]. We statically allocate SPARC_PHYS_BANKS+1 of
34  * these structs, this is arbitrary. The entry after the
35  * last valid one has num_bytes==0.
36  */
38  unsigned long base_addr;
39  unsigned long num_bytes;
40 };
41 
42 #define SPARC_PHYS_BANKS 32
43 
45 
46 /* passing structs on the Sparc slow us down tremendously... */
47 
48 /* #define STRICT_MM_TYPECHECKS */
49 
50 #ifdef STRICT_MM_TYPECHECKS
51 /*
52  * These are used to make use of C type-checking..
53  */
54 typedef struct { unsigned long pte; } pte_t;
55 typedef struct { unsigned long iopte; } iopte_t;
56 typedef struct { unsigned long pmdv[16]; } pmd_t;
57 typedef struct { unsigned long pgd; } pgd_t;
58 typedef struct { unsigned long ctxd; } ctxd_t;
59 typedef struct { unsigned long pgprot; } pgprot_t;
60 typedef struct { unsigned long iopgprot; } iopgprot_t;
61 
62 #define pte_val(x) ((x).pte)
63 #define iopte_val(x) ((x).iopte)
64 #define pmd_val(x) ((x).pmdv[0])
65 #define pgd_val(x) ((x).pgd)
66 #define ctxd_val(x) ((x).ctxd)
67 #define pgprot_val(x) ((x).pgprot)
68 #define iopgprot_val(x) ((x).iopgprot)
69 
70 #define __pte(x) ((pte_t) { (x) } )
71 #define __iopte(x) ((iopte_t) { (x) } )
72 /* #define __pmd(x) ((pmd_t) { (x) } ) */ /* XXX procedure with loop */
73 #define __pgd(x) ((pgd_t) { (x) } )
74 #define __ctxd(x) ((ctxd_t) { (x) } )
75 #define __pgprot(x) ((pgprot_t) { (x) } )
76 #define __iopgprot(x) ((iopgprot_t) { (x) } )
77 
78 #else
79 /*
80  * .. while these make it easier on the compiler
81  */
82 typedef unsigned long pte_t;
83 typedef unsigned long iopte_t;
84 typedef struct { unsigned long pmdv[16]; } pmd_t;
85 typedef unsigned long pgd_t;
86 typedef unsigned long ctxd_t;
87 typedef unsigned long pgprot_t;
88 typedef unsigned long iopgprot_t;
89 
90 #define pte_val(x) (x)
91 #define iopte_val(x) (x)
92 #define pmd_val(x) ((x).pmdv[0])
93 #define pgd_val(x) (x)
94 #define ctxd_val(x) (x)
95 #define pgprot_val(x) (x)
96 #define iopgprot_val(x) (x)
97 
98 #define __pte(x) (x)
99 #define __iopte(x) (x)
100 /* #define __pmd(x) (x) */ /* XXX later */
101 #define __pgd(x) (x)
102 #define __ctxd(x) (x)
103 #define __pgprot(x) (x)
104 #define __iopgprot(x) (x)
105 
106 #endif
107 
108 typedef struct page *pgtable_t;
109 
110 #define TASK_UNMAPPED_BASE 0x50000000
111 
112 #else /* !(__ASSEMBLY__) */
113 
114 #define __pgprot(x) (x)
115 
116 #endif /* !(__ASSEMBLY__) */
117 
118 #define PAGE_OFFSET 0xf0000000
119 #ifndef __ASSEMBLY__
120 extern unsigned long phys_base;
121 extern unsigned long pfn_base;
122 #endif
123 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + phys_base)
124 #define __va(x) ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
125 
126 #define virt_to_phys __pa
127 #define phys_to_virt __va
128 
129 #define ARCH_PFN_OFFSET (pfn_base)
130 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
131 
132 #define pfn_valid(pfn) (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
133 #define virt_addr_valid(kaddr) ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
134 
135 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
136  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
137 
139 #include <asm-generic/getorder.h>
140 
141 #endif /* _SPARC_PAGE_H */