FreeBSD/Linux Kernel Cross Reference
sys/mips/nlm/hal/mmu.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright 2003-2011 Netlogic Microsystems (Netlogic). All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY Netlogic Microsystems ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * NETLOGIC_BSD
31 * $FreeBSD$
32 */
33
34 #ifndef __XLP_MMU_H__
35 #define __XLP_MMU_H__
36
37 #include <mips/nlm/hal/mips-extns.h>
38
39 static __inline__ uint32_t
40 nlm_read_c0_config6(void)
41 {
42 uint32_t rv;
43
44 __asm__ __volatile__ (
45 ".set push\n"
46 ".set mips64\n"
47 "mfc0 %0, $16, 6\n"
48 ".set pop\n"
49 : "=r" (rv));
50
51 return rv;
52 }
53
54 static __inline__ void
55 nlm_write_c0_config6(uint32_t value)
56 {
57 __asm__ __volatile__ (
58 ".set push\n"
59 ".set mips64\n"
60 "mtc0 %0, $16, 6\n"
61 ".set pop\n"
62 : : "r" (value));
63 }
64
65 static __inline__ uint32_t
66 nlm_read_c0_config7(void)
67 {
68 uint32_t rv;
69
70 __asm__ __volatile__ (
71 ".set push\n"
72 ".set mips64\n"
73 "mfc0 %0, $16, 7\n"
74 ".set pop\n"
75 : "=r" (rv));
76
77 return rv;
78 }
79
80 static __inline__ void
81 nlm_write_c0_config7(uint32_t value)
82 {
83 __asm__ __volatile__ (
84 ".set push\n"
85 ".set mips64\n"
86 "mtc0 %0, $16, 7\n"
87 ".set pop\n"
88 : : "r" (value));
89 }
90 /**
91 * On power on reset, XLP comes up with 64 TLBs.
92 * Large-variable-tlb's (ELVT) and extended TLB is disabled.
93 * Enabling large-variable-tlb's sets up the standard
94 * TLB size from 64 to 128 TLBs.
95 * Enabling fixed TLB (EFT) sets up an additional 2048 tlbs.
96 * ELVT + EFT = 128 + 2048 = 2176 TLB entries.
97 * threads 64-entry-standard-tlb 128-entry-standard-tlb
98 * per std-tlb-only| std+EFT | std-tlb-only| std+EFT
99 * core | | |
100 * --------------------------------------------------------
101 * 1 64 64+2048 128 128+2048
102 * 2 64 64+1024 64 64+1024
103 * 4 32 32+512 32 32+512
104 *
105 * 1(G) 64 64+2048 128 128+2048
106 * 2(G) 128 128+2048 128 128+2048
107 * 4(G) 128 128+2048 128 128+2048
108 * (G) = Global mode
109 */
110
111
112 /* en = 1 to enable
113 * en = 0 to disable
114 */
115 static __inline__ void nlm_large_variable_tlb_en (int en)
116 {
117 unsigned int val;
118
119 val = nlm_read_c0_config6();
120 val |= (en << 5);
121 nlm_write_c0_config6(val);
122 return;
123 }
124
125 /* en = 1 to enable
126 * en = 0 to disable
127 */
128 static __inline__ void nlm_pagewalker_en(int en)
129 {
130 unsigned int val;
131
132 val = nlm_read_c0_config6();
133 val |= (en << 3);
134 nlm_write_c0_config6(val);
135 return;
136 }
137
138 /* en = 1 to enable
139 * en = 0 to disable
140 */
141 static __inline__ void nlm_extended_tlb_en(int en)
142 {
143 unsigned int val;
144
145 val = nlm_read_c0_config6();
146 val |= (en << 2);
147 nlm_write_c0_config6(val);
148 return;
149 }
150
151 static __inline__ int nlm_get_num_combined_tlbs(void)
152 {
153 return (((nlm_read_c0_config6() >> 16) & 0xffff) + 1);
154 }
155
156 /* get number of variable TLB entries */
157 static __inline__ int nlm_get_num_vtlbs(void)
158 {
159 return (((nlm_read_c0_config6() >> 6) & 0x3ff) + 1);
160 }
161
162 static __inline__ void nlm_setup_extended_pagemask(int mask)
163 {
164 nlm_write_c0_config7(mask);
165 }
166
167 #endif
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