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1 | /* $Id: pgtsun4c.h,v 1.37 2000/06/05 06:08:46 anton Exp $ |
2 | * pgtsun4c.h: Sun4c specific pgtable.h defines and code. | |
3 | * | |
4 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
5 | */ | |
6 | #ifndef _SPARC_PGTSUN4C_H | |
7 | #define _SPARC_PGTSUN4C_H | |
8 | ||
9 | #include <asm/contregs.h> | |
10 | ||
11 | /* PMD_SHIFT determines the size of the area a second-level page table can map */ | |
12 | #define SUN4C_PMD_SHIFT 22 | |
13 | ||
14 | /* PGDIR_SHIFT determines what a third-level page table entry can map */ | |
15 | #define SUN4C_PGDIR_SHIFT 22 | |
16 | #define SUN4C_PGDIR_SIZE (1UL << SUN4C_PGDIR_SHIFT) | |
17 | #define SUN4C_PGDIR_MASK (~(SUN4C_PGDIR_SIZE-1)) | |
18 | #define SUN4C_PGDIR_ALIGN(addr) (((addr)+SUN4C_PGDIR_SIZE-1)&SUN4C_PGDIR_MASK) | |
19 | ||
20 | /* To represent how the sun4c mmu really lays things out. */ | |
21 | #define SUN4C_REAL_PGDIR_SHIFT 18 | |
22 | #define SUN4C_REAL_PGDIR_SIZE (1UL << SUN4C_REAL_PGDIR_SHIFT) | |
23 | #define SUN4C_REAL_PGDIR_MASK (~(SUN4C_REAL_PGDIR_SIZE-1)) | |
24 | #define SUN4C_REAL_PGDIR_ALIGN(addr) (((addr)+SUN4C_REAL_PGDIR_SIZE-1)&SUN4C_REAL_PGDIR_MASK) | |
25 | ||
26 | /* 16 bit PFN on sun4c */ | |
27 | #define SUN4C_PFN_MASK 0xffff | |
28 | ||
29 | /* Don't increase these unless the structures in sun4c.c are fixed */ | |
30 | #define SUN4C_MAX_SEGMAPS 256 | |
31 | #define SUN4C_MAX_CONTEXTS 16 | |
32 | ||
33 | /* | |
34 | * To be efficient, and not have to worry about allocating such | |
35 | * a huge pgd, we make the kernel sun4c tables each hold 1024 | |
36 | * entries and the pgd similarly just like the i386 tables. | |
37 | */ | |
38 | #define SUN4C_PTRS_PER_PTE 1024 | |
39 | #define SUN4C_PTRS_PER_PMD 1 | |
40 | #define SUN4C_PTRS_PER_PGD 1024 | |
41 | ||
42 | /* | |
43 | * Sparc SUN4C pte fields. | |
44 | */ | |
45 | #define _SUN4C_PAGE_VALID 0x80000000 | |
46 | #define _SUN4C_PAGE_SILENT_READ 0x80000000 /* synonym */ | |
47 | #define _SUN4C_PAGE_DIRTY 0x40000000 | |
48 | #define _SUN4C_PAGE_SILENT_WRITE 0x40000000 /* synonym */ | |
49 | #define _SUN4C_PAGE_PRIV 0x20000000 /* privileged page */ | |
50 | #define _SUN4C_PAGE_NOCACHE 0x10000000 /* non-cacheable page */ | |
51 | #define _SUN4C_PAGE_PRESENT 0x08000000 /* implemented in software */ | |
52 | #define _SUN4C_PAGE_IO 0x04000000 /* I/O page */ | |
53 | #define _SUN4C_PAGE_FILE 0x02000000 /* implemented in software */ | |
54 | #define _SUN4C_PAGE_READ 0x00800000 /* implemented in software */ | |
55 | #define _SUN4C_PAGE_WRITE 0x00400000 /* implemented in software */ | |
56 | #define _SUN4C_PAGE_ACCESSED 0x00200000 /* implemented in software */ | |
57 | #define _SUN4C_PAGE_MODIFIED 0x00100000 /* implemented in software */ | |
58 | ||
59 | #define _SUN4C_READABLE (_SUN4C_PAGE_READ|_SUN4C_PAGE_SILENT_READ|\ | |
60 | _SUN4C_PAGE_ACCESSED) | |
61 | #define _SUN4C_WRITEABLE (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE|\ | |
62 | _SUN4C_PAGE_MODIFIED) | |
63 | ||
64 | #define _SUN4C_PAGE_CHG_MASK (0xffff|_SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_MODIFIED) | |
65 | ||
66 | #define SUN4C_PAGE_NONE __pgprot(_SUN4C_PAGE_PRESENT) | |
67 | #define SUN4C_PAGE_SHARED __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE|\ | |
68 | _SUN4C_PAGE_WRITE) | |
69 | #define SUN4C_PAGE_COPY __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE) | |
70 | #define SUN4C_PAGE_READONLY __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE) | |
71 | #define SUN4C_PAGE_KERNEL __pgprot(_SUN4C_READABLE|_SUN4C_WRITEABLE|\ | |
72 | _SUN4C_PAGE_DIRTY|_SUN4C_PAGE_PRIV) | |
73 | ||
74 | /* SUN4C swap entry encoding | |
75 | * | |
76 | * We use 5 bits for the type and 19 for the offset. This gives us | |
77 | * 32 swapfiles of 4GB each. Encoding looks like: | |
78 | * | |
79 | * RRRRRRRRooooooooooooooooooottttt | |
80 | * fedcba9876543210fedcba9876543210 | |
81 | * | |
82 | * The top 8 bits are reserved for protection and status bits, especially | |
83 | * FILE and PRESENT. | |
84 | */ | |
85 | #define SUN4C_SWP_TYPE_MASK 0x1f | |
86 | #define SUN4C_SWP_OFF_MASK 0x7ffff | |
87 | #define SUN4C_SWP_OFF_SHIFT 5 | |
88 | ||
89 | #ifndef __ASSEMBLY__ | |
90 | ||
91 | static inline unsigned long sun4c_get_synchronous_error(void) | |
92 | { | |
93 | unsigned long sync_err; | |
94 | ||
95 | __asm__ __volatile__("lda [%1] %2, %0\n\t" : | |
96 | "=r" (sync_err) : | |
97 | "r" (AC_SYNC_ERR), "i" (ASI_CONTROL)); | |
98 | return sync_err; | |
99 | } | |
100 | ||
101 | static inline unsigned long sun4c_get_synchronous_address(void) | |
102 | { | |
103 | unsigned long sync_addr; | |
104 | ||
105 | __asm__ __volatile__("lda [%1] %2, %0\n\t" : | |
106 | "=r" (sync_addr) : | |
107 | "r" (AC_SYNC_VA), "i" (ASI_CONTROL)); | |
108 | return sync_addr; | |
109 | } | |
110 | ||
111 | /* SUN4C pte, segmap, and context manipulation */ | |
112 | static inline unsigned long sun4c_get_segmap(unsigned long addr) | |
113 | { | |
114 | register unsigned long entry; | |
115 | ||
116 | __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" : | |
117 | "=r" (entry) : | |
118 | "r" (addr), "i" (ASI_SEGMAP)); | |
119 | ||
120 | return entry; | |
121 | } | |
122 | ||
123 | static inline void sun4c_put_segmap(unsigned long addr, unsigned long entry) | |
124 | { | |
125 | ||
126 | __asm__ __volatile__("\n\tstba %1, [%0] %2; nop; nop; nop;\n\t" : : | |
127 | "r" (addr), "r" (entry), | |
128 | "i" (ASI_SEGMAP) | |
129 | : "memory"); | |
130 | } | |
131 | ||
132 | static inline unsigned long sun4c_get_pte(unsigned long addr) | |
133 | { | |
134 | register unsigned long entry; | |
135 | ||
136 | __asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" : | |
137 | "=r" (entry) : | |
138 | "r" (addr), "i" (ASI_PTE)); | |
139 | return entry; | |
140 | } | |
141 | ||
142 | static inline void sun4c_put_pte(unsigned long addr, unsigned long entry) | |
143 | { | |
144 | __asm__ __volatile__("\n\tsta %1, [%0] %2; nop; nop; nop;\n\t" : : | |
145 | "r" (addr), | |
146 | "r" ((entry & ~(_SUN4C_PAGE_PRESENT))), "i" (ASI_PTE) | |
147 | : "memory"); | |
148 | } | |
149 | ||
150 | static inline int sun4c_get_context(void) | |
151 | { | |
152 | register int ctx; | |
153 | ||
154 | __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" : | |
155 | "=r" (ctx) : | |
156 | "r" (AC_CONTEXT), "i" (ASI_CONTROL)); | |
157 | ||
158 | return ctx; | |
159 | } | |
160 | ||
161 | static inline int sun4c_set_context(int ctx) | |
162 | { | |
163 | __asm__ __volatile__("\n\tstba %0, [%1] %2; nop; nop; nop;\n\t" : : | |
164 | "r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL) | |
165 | : "memory"); | |
166 | ||
167 | return ctx; | |
168 | } | |
169 | ||
170 | #endif /* !(__ASSEMBLY__) */ | |
171 | ||
172 | #endif /* !(_SPARC_PGTSUN4C_H) */ |