1 #ifndef _SPARC_VAC_OPS_H
2 #define _SPARC_VAC_OPS_H
3
4 /* vac-ops.h: Inline assembly routines to do operations on the Sparc
5 * VAC (virtual address cache) for the sun4c.
6 *
7 * Copyright (C) 1994, David S. Miller (davem@caip.rutgers.edu)
8 */
9
10 #include <asm/sysen.h>
11 #include <asm/contregs.h>
12 #include <asm/asi.h>
13
14 /* The SUN4C models have a virtually addressed write-through
15 * cache.
16 *
17 * The cache tags are directly accessible through an ASI and
18 * each have the form:
19 *
20 * ------------------------------------------------------------
21 * | MBZ | CONTEXT | WRITE | PRIV | VALID | MBZ | TagID | MBZ |
22 * ------------------------------------------------------------
23 * 31 25 24 22 21 20 19 18 16 15 2 1 0
24 *
25 * MBZ: These bits are either unused and/or reserved and should
26 * be written as zeroes.
27 *
28 * CONTEXT: Records the context to which this cache line belongs.
29 *
30 * WRITE: A copy of the writable bit from the mmu pte access bits.
31 *
32 * PRIV: A copy of the privileged bit from the pte access bits.
33 *
34 * VALID: If set, this line is valid, else invalid.
35 *
36 * TagID: Fourteen bits of tag ID.
37 *
38 * Every virtual address is seen by the cache like this:
39 *
40 * ----------------------------------------
41 * | RESV | TagID | LINE | BYTE-in-LINE |
42 * ----------------------------------------
43 * 31 30 29 16 15 4 3 0
44 *
45 * RESV: Unused/reserved.
46 *
47 * TagID: Used to match the Tag-ID in that vac tags.
48 *
49 * LINE: Which line within the cache
50 *
51 * BYTE-in-LINE: Which byte within the cache line.
52 */
53
54 /* Sun4c VAC Tags */
55 #define S4CVACTAG_CID 0x01c00000
56 #define S4CVACTAG_W 0x00200000
57 #define S4CVACTAG_P 0x00100000
58 #define S4CVACTAG_V 0x00080000
59 #define S4CVACTAG_TID 0x0000fffc
60
61 /* Sun4c VAC Virtual Address */
62 /* These aren't used, why bother? (Anton) */
63 #if 0
64 #define S4CVACVA_TID 0x3fff0000
65 #define S4CVACVA_LINE 0x0000fff0
66 #define S4CVACVA_BIL 0x0000000f
67 #endif
68
69 /* The indexing of cache lines creates a problem. Because the line
70 * field of a virtual address extends past the page offset within
71 * the virtual address it is possible to have what are called
72 * 'bad aliases' which will create inconsistencies. So we must make
73 * sure that within a context that if a physical page is mapped
74 * more than once, that 'extra' line bits are the same. If this is
75 * not the case, and thus is a 'bad alias' we must turn off the
76 * cacheable bit in the pte's of all such pages.
77 */
78
79 #define S4CVAC_BADBITS 0x0000f000
80
81 /* The following is true if vaddr1 and vaddr2 would cause
82 * a 'bad alias'.
83 */
84 #define S4CVAC_BADALIAS(vaddr1, vaddr2) \
85 ((((unsigned long) (vaddr1)) ^ ((unsigned long) (vaddr2))) & \
86 (S4CVAC_BADBITS))
87
88 /* The following structure describes the characteristics of a sun4c
89 * VAC as probed from the prom during boot time.
90 */
91 struct sun4c_vac_props {
92 unsigned int num_bytes; /* Size of the cache */
93 unsigned int do_hwflushes; /* Hardware flushing available? */
94 unsigned int linesize; /* Size of each line in bytes */
95 unsigned int log2lsize; /* log2(linesize) */
96 unsigned int on; /* VAC is enabled */
97 };
98
99 extern struct sun4c_vac_props sun4c_vacinfo;
100
101 /* sun4c_enable_vac() enables the sun4c virtual address cache. */
sun4c_enable_vac(void)102 static inline void sun4c_enable_vac(void)
103 {
104 __asm__ __volatile__("lduba [%0] %1, %%g1\n\t"
105 "or %%g1, %2, %%g1\n\t"
106 "stba %%g1, [%0] %1\n\t"
107 : /* no outputs */
108 : "r" ((unsigned int) AC_SENABLE),
109 "i" (ASI_CONTROL), "i" (SENABLE_CACHE)
110 : "g1", "memory");
111 sun4c_vacinfo.on = 1;
112 }
113
114 /* sun4c_disable_vac() disables the virtual address cache. */
sun4c_disable_vac(void)115 static inline void sun4c_disable_vac(void)
116 {
117 __asm__ __volatile__("lduba [%0] %1, %%g1\n\t"
118 "andn %%g1, %2, %%g1\n\t"
119 "stba %%g1, [%0] %1\n\t"
120 : /* no outputs */
121 : "r" ((unsigned int) AC_SENABLE),
122 "i" (ASI_CONTROL), "i" (SENABLE_CACHE)
123 : "g1", "memory");
124 sun4c_vacinfo.on = 0;
125 }
126
127 #endif /* !(_SPARC_VAC_OPS_H) */
128