mmu.h revision 331722 
1/*-
2 * Copyright 2003-2011 Netlogic Microsystems (Netlogic). All rights
3 * reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in
13 *    the documentation and/or other materials provided with the
14 *    distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY Netlogic Microsystems ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26 * THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * NETLOGIC_BSD
29 * $FreeBSD: stable/11/sys/mips/nlm/hal/mmu.h 331722 2018-03-29 02:50:57Z eadler $
30 */
31
32#ifndef __XLP_MMU_H__
33#define	__XLP_MMU_H__
34
35#include <mips/nlm/hal/mips-extns.h>
36
37static __inline__ uint32_t
38nlm_read_c0_config6(void)
39{
40	uint32_t rv;
41
42	__asm__ __volatile__ (
43		".set	push\n"
44		".set	mips64\n"
45		"mfc0	%0, $16, 6\n"
46		".set	pop\n"
47		: "=r" (rv));
48
49        return rv;
50}
51
52static __inline__ void
53nlm_write_c0_config6(uint32_t value)
54{
55	__asm__ __volatile__ (
56		".set	push\n"
57		".set	mips64\n"
58		"mtc0	%0, $16, 6\n"
59		".set	pop\n"
60		: : "r" (value));
61}
62
63static __inline__ uint32_t
64nlm_read_c0_config7(void)
65{
66	uint32_t rv;
67
68	__asm__ __volatile__ (
69		".set	push\n"
70		".set	mips64\n"
71		"mfc0	%0, $16, 7\n"
72		".set	pop\n"
73		: "=r" (rv));
74
75        return rv;
76}
77
78static __inline__ void
79nlm_write_c0_config7(uint32_t value)
80{
81	__asm__ __volatile__ (
82		".set	push\n"
83		".set	mips64\n"
84		"mtc0	%0, $16, 7\n"
85		".set	pop\n"
86		: : "r" (value));
87}
88/**
89 * On power on reset, XLP comes up with 64 TLBs.
90 * Large-variable-tlb's (ELVT) and extended TLB is disabled.
91 * Enabling large-variable-tlb's sets up the standard
92 * TLB size from 64 to 128 TLBs.
93 * Enabling fixed TLB (EFT) sets up an additional 2048 tlbs.
94 * ELVT + EFT = 128 + 2048 = 2176 TLB entries.
95 * threads  64-entry-standard-tlb    128-entry-standard-tlb
96 * per      std-tlb-only| std+EFT  | std-tlb-only| std+EFT
97 * core                 |          |             |
98 * --------------------------------------------------------
99 * 1         64           64+2048     128          128+2048
100 * 2         64           64+1024      64           64+1024
101 * 4         32           32+512       32           32+512
102 *
103 * 1(G)      64           64+2048     128          128+2048
104 * 2(G)      128         128+2048     128          128+2048
105 * 4(G)      128         128+2048     128          128+2048
106 * (G) = Global mode
107 */
108
109
110/* en = 1 to enable
111 * en = 0 to disable
112 */
113static __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 */
126static __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 */
139static __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
149static __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 */
155static __inline__ int nlm_get_num_vtlbs(void)
156{
157	return (((nlm_read_c0_config6() >> 6) & 0x3ff) + 1);
158}
159
160static __inline__ void nlm_setup_extended_pagemask(int mask)
161{
162	nlm_write_c0_config7(mask);
163}
164
165#endif
166