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.
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 #ifndef _SPARC_PGTSUN4C_H
7 #define _SPARC_PGTSUN4C_H
9 #include <asm/contregs.h>
11 /* PMD_SHIFT determines the size of the area a second-level page table can map */
12 #define SUN4C_PMD_SHIFT 22
13 #define SUN4C_PMD_SIZE (1UL << SUN4C_PMD_SHIFT)
14 #define SUN4C_PMD_MASK (~(SUN4C_PMD_SIZE-1))
15 #define SUN4C_PMD_ALIGN(addr) (((addr)+SUN4C_PMD_SIZE-1)&SUN4C_PMD_MASK)
17 /* PGDIR_SHIFT determines what a third-level page table entry can map */
18 #define SUN4C_PGDIR_SHIFT 22
19 #define SUN4C_PGDIR_SIZE (1UL << SUN4C_PGDIR_SHIFT)
20 #define SUN4C_PGDIR_MASK (~(SUN4C_PGDIR_SIZE-1))
21 #define SUN4C_PGDIR_ALIGN(addr) (((addr)+SUN4C_PGDIR_SIZE-1)&SUN4C_PGDIR_MASK)
23 /* To represent how the sun4c mmu really lays things out. */
24 #define SUN4C_REAL_PGDIR_SHIFT 18
25 #define SUN4C_REAL_PGDIR_SIZE (1UL << SUN4C_REAL_PGDIR_SHIFT)
26 #define SUN4C_REAL_PGDIR_MASK (~(SUN4C_REAL_PGDIR_SIZE-1))
27 #define SUN4C_REAL_PGDIR_ALIGN(addr) (((addr)+SUN4C_REAL_PGDIR_SIZE-1)&SUN4C_REAL_PGDIR_MASK)
29 /* 16 bit PFN on sun4c */
30 #define SUN4C_PFN_MASK 0xffff
32 /* Don't increase these unless the structures in sun4c.c are fixed */
33 #define SUN4C_MAX_SEGMAPS 256
34 #define SUN4C_MAX_CONTEXTS 16
37 * To be efficient, and not have to worry about allocating such
38 * a huge pgd, we make the kernel sun4c tables each hold 1024
39 * entries and the pgd similarly just like the i386 tables.
41 #define SUN4C_PTRS_PER_PTE 1024
42 #define SUN4C_PTRS_PER_PMD 1
43 #define SUN4C_PTRS_PER_PGD 1024
46 * Sparc SUN4C pte fields.
48 #define _SUN4C_PAGE_VALID 0x80000000
49 #define _SUN4C_PAGE_SILENT_READ 0x80000000 /* synonym */
50 #define _SUN4C_PAGE_DIRTY 0x40000000
51 #define _SUN4C_PAGE_SILENT_WRITE 0x40000000 /* synonym */
52 #define _SUN4C_PAGE_PRIV 0x20000000 /* privileged page */
53 #define _SUN4C_PAGE_NOCACHE 0x10000000 /* non-cacheable page */
54 #define _SUN4C_PAGE_PRESENT 0x08000000 /* implemented in software */
55 #define _SUN4C_PAGE_IO 0x04000000 /* I/O page */
56 #define _SUN4C_PAGE_FILE 0x02000000 /* implemented in software */
57 #define _SUN4C_PAGE_READ 0x00800000 /* implemented in software */
58 #define _SUN4C_PAGE_WRITE 0x00400000 /* implemented in software */
59 #define _SUN4C_PAGE_ACCESSED 0x00200000 /* implemented in software */
60 #define _SUN4C_PAGE_MODIFIED 0x00100000 /* implemented in software */
62 #define _SUN4C_READABLE (_SUN4C_PAGE_READ|_SUN4C_PAGE_SILENT_READ|\
64 #define _SUN4C_WRITEABLE (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE|\
67 #define _SUN4C_PAGE_CHG_MASK (0xffff|_SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_MODIFIED)
69 #define SUN4C_PAGE_NONE __pgprot(_SUN4C_PAGE_PRESENT)
70 #define SUN4C_PAGE_SHARED __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE|\
72 #define SUN4C_PAGE_COPY __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
73 #define SUN4C_PAGE_READONLY __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
74 #define SUN4C_PAGE_KERNEL __pgprot(_SUN4C_READABLE|_SUN4C_WRITEABLE|\
75 _SUN4C_PAGE_DIRTY|_SUN4C_PAGE_PRIV)
77 /* SUN4C swap entry encoding
79 * We use 5 bits for the type and 19 for the offset. This gives us
80 * 32 swapfiles of 4GB each. Encoding looks like:
82 * RRRRRRRRooooooooooooooooooottttt
83 * fedcba9876543210fedcba9876543210
85 * The top 8 bits are reserved for protection and status bits, especially
88 #define SUN4C_SWP_TYPE_MASK 0x1f
89 #define SUN4C_SWP_OFF_MASK 0x7ffff
90 #define SUN4C_SWP_OFF_SHIFT 5
94 static inline unsigned long sun4c_get_synchronous_error(void)
96 unsigned long sync_err;
98 __asm__ __volatile__("lda [%1] %2, %0\n\t" :
100 "r" (AC_SYNC_ERR), "i" (ASI_CONTROL));
104 static inline unsigned long sun4c_get_synchronous_address(void)
106 unsigned long sync_addr;
108 __asm__ __volatile__("lda [%1] %2, %0\n\t" :
110 "r" (AC_SYNC_VA), "i" (ASI_CONTROL));
114 /* SUN4C pte, segmap, and context manipulation */
115 static inline unsigned long sun4c_get_segmap(unsigned long addr)
117 register unsigned long entry;
119 __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
121 "r" (addr), "i" (ASI_SEGMAP));
126 static inline void sun4c_put_segmap(unsigned long addr, unsigned long entry)
129 __asm__ __volatile__("\n\tstba %1, [%0] %2; nop; nop; nop;\n\t" : :
130 "r" (addr), "r" (entry),
135 static inline unsigned long sun4c_get_pte(unsigned long addr)
137 register unsigned long entry;
139 __asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" :
141 "r" (addr), "i" (ASI_PTE));
145 static inline void sun4c_put_pte(unsigned long addr, unsigned long entry)
147 __asm__ __volatile__("\n\tsta %1, [%0] %2; nop; nop; nop;\n\t" : :
149 "r" ((entry & ~(_SUN4C_PAGE_PRESENT))), "i" (ASI_PTE)
153 static inline int sun4c_get_context(void)
157 __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
159 "r" (AC_CONTEXT), "i" (ASI_CONTROL));
164 static inline int sun4c_set_context(int ctx)
166 __asm__ __volatile__("\n\tstba %0, [%1] %2; nop; nop; nop;\n\t" : :
167 "r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL)
173 #endif /* !(__ASSEMBLY__) */
175 #endif /* !(_SPARC_PGTSUN4C_H) */