1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * ross.h: Ross module specific definitions and defines.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8 #ifndef _SPARC_ROSS_H
9 #define _SPARC_ROSS_H
10
11 #include <asm/asi.h>
12 #include <asm/page.h>
13
14 /* Ross made Hypersparcs have a %psr 'impl' field of '0001'. The 'vers'
15 * field has '1111'.
16 */
17
18 /* The MMU control register fields on the HyperSparc.
19 *
20 * -----------------------------------------------------------------
21 * |implvers| RSV |CWR|SE|WBE| MID |BM| C|CS|MR|CM|RSV|CE|RSV|NF|ME|
22 * -----------------------------------------------------------------
23 * 31 24 23-22 21 20 19 18-15 14 13 12 11 10 9 8 7-2 1 0
24 *
25 * Phew, lots of fields there ;-)
26 *
27 * CWR: Cache Wrapping Enabled, if one cache wrapping is on.
28 * SE: Snoop Enable, turns on bus snooping for cache activity if one.
29 * WBE: Write Buffer Enable, one turns it on.
30 * MID: The ModuleID of the chip for MBus transactions.
31 * BM: Boot-Mode. One indicates the MMU is in boot mode.
32 * C: Indicates whether accesses are cachable while the MMU is
33 * disabled.
34 * CS: Cache Size -- 0 = 128k, 1 = 256k
35 * MR: Memory Reflection, one indicates that the memory bus connected
36 * to the MBus supports memory reflection.
37 * CM: Cache Mode -- 0 = write-through, 1 = copy-back
38 * CE: Cache Enable -- 0 = no caching, 1 = cache is on
39 * NF: No Fault -- 0 = faults trap the CPU from supervisor mode
40 * 1 = faults from supervisor mode do not generate traps
41 * ME: MMU Enable -- 0 = MMU is off, 1 = MMU is on
42 */
43
44 #define HYPERSPARC_CWENABLE 0x00200000
45 #define HYPERSPARC_SBENABLE 0x00100000
46 #define HYPERSPARC_WBENABLE 0x00080000
47 #define HYPERSPARC_MIDMASK 0x00078000
48 #define HYPERSPARC_BMODE 0x00004000
49 #define HYPERSPARC_ACENABLE 0x00002000
50 #define HYPERSPARC_CSIZE 0x00001000
51 #define HYPERSPARC_MRFLCT 0x00000800
52 #define HYPERSPARC_CMODE 0x00000400
53 #define HYPERSPARC_CENABLE 0x00000100
54 #define HYPERSPARC_NFAULT 0x00000002
55 #define HYPERSPARC_MENABLE 0x00000001
56
57
58 /* The ICCR instruction cache register on the HyperSparc.
59 *
60 * -----------------------------------------------
61 * | | FTD | ICE |
62 * -----------------------------------------------
63 * 31 1 0
64 *
65 * This register is accessed using the V8 'wrasr' and 'rdasr'
66 * opcodes, since not all assemblers understand them and those
67 * that do use different semantics I will just hard code the
68 * instruction with a '.word' statement.
69 *
70 * FTD: If set to one flush instructions executed during an
71 * instruction cache hit occurs, the corresponding line
72 * for said cache-hit is invalidated. If FTD is zero,
73 * an unimplemented 'flush' trap will occur when any
74 * flush is executed by the processor.
75 *
76 * ICE: If set to one, the instruction cache is enabled. If
77 * zero, the cache will not be used for instruction fetches.
78 *
79 * All other bits are read as zeros, and writes to them have no
80 * effect.
81 *
82 * Wheee, not many assemblers understand the %iccr register nor
83 * the generic asr r/w instructions.
84 *
85 * 1000 0011 0100 0111 1100 0000 0000 0000 ! rd %iccr, %g1
86 *
87 * 0x 8 3 4 7 c 0 0 0 ! 0x8347c000
88 *
89 * 1011 1111 1000 0000 0110 0000 0000 0000 ! wr %g1, 0x0, %iccr
90 *
91 * 0x b f 8 0 6 0 0 0 ! 0xbf806000
92 *
93 */
94
95 #define HYPERSPARC_ICCR_FTD 0x00000002
96 #define HYPERSPARC_ICCR_ICE 0x00000001
97
98 #ifndef __ASSEMBLY__
99
100 static inline unsigned int get_ross_icr(void)
101 {
102 unsigned int icreg;
103
104 __asm__ __volatile__(".word 0x8347c000\n\t" /* rd %iccr, %g1 */
105 "mov %%g1, %0\n\t"
106 : "=r" (icreg)
107 : /* no inputs */
108 : "g1", "memory");
109
110 return icreg;
111 }
112
113 static inline void put_ross_icr(unsigned int icreg)
114 {
115 __asm__ __volatile__("or %%g0, %0, %%g1\n\t"
116 ".word 0xbf806000\n\t" /* wr %g1, 0x0, %iccr */
117 "nop\n\t"
118 "nop\n\t"
119 "nop\n\t"
120 : /* no outputs */
121 : "r" (icreg)
122 : "g1", "memory");
123
124 return;
125 }
126
127 /* HyperSparc specific cache flushing. */
128
129 /* This is for the on-chip instruction cache. */
130 static inline void hyper_flush_whole_icache(void)
131 {
132 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t"
133 : /* no outputs */
134 : "i" (ASI_M_FLUSH_IWHOLE)
135 : "memory");
136 return;
137 }
138
139 extern int vac_cache_size;
140 extern int vac_line_size;
141
142 static inline void hyper_clear_all_tags(void)
143 {
144 unsigned long addr;
145
146 for(addr = 0; addr < vac_cache_size; addr += vac_line_size)
147 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
148 : /* no outputs */
149 : "r" (addr), "i" (ASI_M_DATAC_TAG)
150 : "memory");
151 }
152
153 static inline void hyper_flush_unconditional_combined(void)
154 {
155 unsigned long addr;
156
157 for (addr = 0; addr < vac_cache_size; addr += vac_line_size)
158 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
159 : /* no outputs */
160 : "r" (addr), "i" (ASI_M_FLUSH_CTX)
161 : "memory");
162 }
163
164 static inline void hyper_flush_cache_user(void)
165 {
166 unsigned long addr;
167
168 for (addr = 0; addr < vac_cache_size; addr += vac_line_size)
169 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
170 : /* no outputs */
171 : "r" (addr), "i" (ASI_M_FLUSH_USER)
172 : "memory");
173 }
174
175 static inline void hyper_flush_cache_page(unsigned long page)
176 {
177 unsigned long end;
178
179 page &= PAGE_MASK;
180 end = page + PAGE_SIZE;
181 while (page < end) {
182 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
183 : /* no outputs */
184 : "r" (page), "i" (ASI_M_FLUSH_PAGE)
185 : "memory");
186 page += vac_line_size;
187 }
188 }
189
190 #endif /* !(__ASSEMBLY__) */
191
192 #endif /* !(_SPARC_ROSS_H) */
193
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