1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 */
32
33 #ifndef __XLP_MMU_H__
34 #define __XLP_MMU_H__
35
36 #include <mips/nlm/hal/mips-extns.h>
37
38 static __inline__ uint32_t
nlm_read_c0_config6(void)39 nlm_read_c0_config6(void)
40 {
41 uint32_t rv;
42
43 __asm__ __volatile__ (
44 ".set push\n"
45 ".set mips64\n"
46 "mfc0 %0, $16, 6\n"
47 ".set pop\n"
48 : "=r" (rv));
49
50 return rv;
51 }
52
53 static __inline__ void
nlm_write_c0_config6(uint32_t value)54 nlm_write_c0_config6(uint32_t value)
55 {
56 __asm__ __volatile__ (
57 ".set push\n"
58 ".set mips64\n"
59 "mtc0 %0, $16, 6\n"
60 ".set pop\n"
61 : : "r" (value));
62 }
63
64 static __inline__ uint32_t
nlm_read_c0_config7(void)65 nlm_read_c0_config7(void)
66 {
67 uint32_t rv;
68
69 __asm__ __volatile__ (
70 ".set push\n"
71 ".set mips64\n"
72 "mfc0 %0, $16, 7\n"
73 ".set pop\n"
74 : "=r" (rv));
75
76 return rv;
77 }
78
79 static __inline__ void
nlm_write_c0_config7(uint32_t value)80 nlm_write_c0_config7(uint32_t value)
81 {
82 __asm__ __volatile__ (
83 ".set push\n"
84 ".set mips64\n"
85 "mtc0 %0, $16, 7\n"
86 ".set pop\n"
87 : : "r" (value));
88 }
89 /**
90 * On power on reset, XLP comes up with 64 TLBs.
91 * Large-variable-tlb's (ELVT) and extended TLB is disabled.
92 * Enabling large-variable-tlb's sets up the standard
93 * TLB size from 64 to 128 TLBs.
94 * Enabling fixed TLB (EFT) sets up an additional 2048 tlbs.
95 * ELVT + EFT = 128 + 2048 = 2176 TLB entries.
96 * threads 64-entry-standard-tlb 128-entry-standard-tlb
97 * per std-tlb-only| std+EFT | std-tlb-only| std+EFT
98 * core | | |
99 * --------------------------------------------------------
100 * 1 64 64+2048 128 128+2048
101 * 2 64 64+1024 64 64+1024
102 * 4 32 32+512 32 32+512
103 *
104 * 1(G) 64 64+2048 128 128+2048
105 * 2(G) 128 128+2048 128 128+2048
106 * 4(G) 128 128+2048 128 128+2048
107 * (G) = Global mode
108 */
109
110 /* en = 1 to enable
111 * en = 0 to disable
112 */
nlm_large_variable_tlb_en(int en)113 static __inline__ void nlm_large_variable_tlb_en (int en)
114 {
115 unsigned int val;
116
117 val = nlm_read_c0_config6();
118 val |= (en << 5);
119 nlm_write_c0_config6(val);
120 return;
121 }
122
123 /* en = 1 to enable
124 * en = 0 to disable
125 */
nlm_pagewalker_en(int en)126 static __inline__ void nlm_pagewalker_en(int en)
127 {
128 unsigned int val;
129
130 val = nlm_read_c0_config6();
131 val |= (en << 3);
132 nlm_write_c0_config6(val);
133 return;
134 }
135
136 /* en = 1 to enable
137 * en = 0 to disable
138 */
nlm_extended_tlb_en(int en)139 static __inline__ void nlm_extended_tlb_en(int en)
140 {
141 unsigned int val;
142
143 val = nlm_read_c0_config6();
144 val |= (en << 2);
145 nlm_write_c0_config6(val);
146 return;
147 }
148
nlm_get_num_combined_tlbs(void)149 static __inline__ int nlm_get_num_combined_tlbs(void)
150 {
151 return (((nlm_read_c0_config6() >> 16) & 0xffff) + 1);
152 }
153
154 /* get number of variable TLB entries */
nlm_get_num_vtlbs(void)155 static __inline__ int nlm_get_num_vtlbs(void)
156 {
157 return (((nlm_read_c0_config6() >> 6) & 0x3ff) + 1);
158 }
159
nlm_setup_extended_pagemask(int mask)160 static __inline__ void nlm_setup_extended_pagemask(int mask)
161 {
162 nlm_write_c0_config7(mask);
163 }
164
165 #endif
166