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
nlm_read_c0_config6(void)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
nlm_write_c0_config6(uint32_t value)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
nlm_read_c0_config7(void)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
nlm_write_c0_config7(uint32_t value)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 /* en = 1 to enable
112 * en = 0 to disable
113 */
nlm_large_variable_tlb_en(int en)114 static __inline__ void nlm_large_variable_tlb_en (int en)
115 {
116 unsigned int val;
117
118 val = nlm_read_c0_config6();
119 val |= (en << 5);
120 nlm_write_c0_config6(val);
121 return;
122 }
123
124 /* en = 1 to enable
125 * en = 0 to disable
126 */
nlm_pagewalker_en(int en)127 static __inline__ void nlm_pagewalker_en(int en)
128 {
129 unsigned int val;
130
131 val = nlm_read_c0_config6();
132 val |= (en << 3);
133 nlm_write_c0_config6(val);
134 return;
135 }
136
137 /* en = 1 to enable
138 * en = 0 to disable
139 */
nlm_extended_tlb_en(int en)140 static __inline__ void nlm_extended_tlb_en(int en)
141 {
142 unsigned int val;
143
144 val = nlm_read_c0_config6();
145 val |= (en << 2);
146 nlm_write_c0_config6(val);
147 return;
148 }
149
nlm_get_num_combined_tlbs(void)150 static __inline__ int nlm_get_num_combined_tlbs(void)
151 {
152 return (((nlm_read_c0_config6() >> 16) & 0xffff) + 1);
153 }
154
155 /* get number of variable TLB entries */
nlm_get_num_vtlbs(void)156 static __inline__ int nlm_get_num_vtlbs(void)
157 {
158 return (((nlm_read_c0_config6() >> 6) & 0x3ff) + 1);
159 }
160
nlm_setup_extended_pagemask(int mask)161 static __inline__ void nlm_setup_extended_pagemask(int mask)
162 {
163 nlm_write_c0_config7(mask);
164 }
165
166 #endif
167