1 /*
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
sun4c_get_synchronous_error(void)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
sun4c_get_synchronous_address(void)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 */
sun4c_get_segmap(unsigned long addr)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
sun4c_put_segmap(unsigned long addr,unsigned long entry)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
sun4c_get_pte(unsigned long addr)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
sun4c_put_pte(unsigned long addr,unsigned long entry)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
sun4c_get_context(void)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
sun4c_set_context(int ctx)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) */
173