FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/k6_mem.c
1 /*-
2 * Copyright (c) 1999 Brian Fundakowski Feldman
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/11.2/sys/i386/i386/k6_mem.c 331722 2018-03-29 02:50:57Z eadler $");
29
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.h>
34 #include <sys/memrange.h>
35
36 #include <machine/cputypes.h>
37 #include <machine/md_var.h>
38 #include <machine/specialreg.h>
39
40 /*
41 * A K6-2 MTRR is defined as the highest 15 bits having the address, the next
42 * 15 having the mask, the 1st bit being "write-combining" and the 0th bit
43 * being "uncacheable".
44 *
45 * Address Mask WC UC
46 * | XXXXXXXXXXXXXXX | XXXXXXXXXXXXXXX | X | X |
47 *
48 * There are two of these in the 64-bit UWCCR.
49 */
50
51 #define UWCCR 0xc0000085
52
53 #define K6_REG_GET(reg, addr, mask, wc, uc) do { \
54 addr = (reg) & 0xfffe0000; \
55 mask = ((reg) & 0x1fffc) >> 2; \
56 wc = ((reg) & 0x2) >> 1; \
57 uc = (reg) & 0x1; \
58 } while (0)
59
60 #define K6_REG_MAKE(addr, mask, wc, uc) \
61 ((addr) | ((mask) << 2) | ((wc) << 1) | uc)
62
63 static void k6_mrinit(struct mem_range_softc *sc);
64 static int k6_mrset(struct mem_range_softc *, struct mem_range_desc *,
65 int *);
66 static __inline int k6_mrmake(struct mem_range_desc *, u_int32_t *);
67 static void k6_mem_drvinit(void *);
68
69 static struct mem_range_ops k6_mrops =
70 {
71 k6_mrinit,
72 k6_mrset,
73 NULL,
74 NULL
75 };
76
77 static __inline int
78 k6_mrmake(struct mem_range_desc *desc, u_int32_t *mtrr)
79 {
80 u_int32_t len = 0, wc, uc;
81 int bit;
82
83 if (desc->mr_base &~ 0xfffe0000)
84 return (EINVAL);
85 if (desc->mr_len < 131072 || !powerof2(desc->mr_len))
86 return (EINVAL);
87 if (desc->mr_flags &~ (MDF_WRITECOMBINE|MDF_UNCACHEABLE|MDF_FORCE))
88 return (EOPNOTSUPP);
89
90 for (bit = ffs(desc->mr_len >> 17) - 1; bit < 15; bit++)
91 len |= 1 << bit;
92 wc = (desc->mr_flags & MDF_WRITECOMBINE) ? 1 : 0;
93 uc = (desc->mr_flags & MDF_UNCACHEABLE) ? 1 : 0;
94
95 *mtrr = K6_REG_MAKE(desc->mr_base, len, wc, uc);
96 return (0);
97 }
98
99 static void
100 k6_mrinit(struct mem_range_softc *sc)
101 {
102 u_int64_t reg;
103 u_int32_t addr, mask, wc, uc;
104 int d;
105
106 sc->mr_cap = 0;
107 sc->mr_ndesc = 2; /* XXX (BFF) For now, we only have one msr for this */
108 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
109 M_MEMDESC, M_NOWAIT | M_ZERO);
110 if (sc->mr_desc == NULL)
111 panic("k6_mrinit: malloc returns NULL");
112
113 reg = rdmsr(UWCCR);
114 for (d = 0; d < sc->mr_ndesc; d++) {
115 u_int32_t one = (reg & (0xffffffff << (32 * d))) >> (32 * d);
116
117 K6_REG_GET(one, addr, mask, wc, uc);
118 sc->mr_desc[d].mr_base = addr;
119 sc->mr_desc[d].mr_len = ffs(mask) << 17;
120 if (wc)
121 sc->mr_desc[d].mr_flags |= MDF_WRITECOMBINE;
122 if (uc)
123 sc->mr_desc[d].mr_flags |= MDF_UNCACHEABLE;
124 }
125
126 printf("K6-family MTRR support enabled (%d registers)\n", sc->mr_ndesc);
127 }
128
129 static int
130 k6_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
131 {
132 u_int64_t reg;
133 u_int32_t mtrr;
134 int error, d;
135
136 switch (*arg) {
137 case MEMRANGE_SET_UPDATE:
138 error = k6_mrmake(desc, &mtrr);
139 if (error)
140 return (error);
141 for (d = 0; d < sc->mr_ndesc; d++) {
142 if (!sc->mr_desc[d].mr_len) {
143 sc->mr_desc[d] = *desc;
144 goto out;
145 }
146 if (sc->mr_desc[d].mr_base == desc->mr_base &&
147 sc->mr_desc[d].mr_len == desc->mr_len)
148 return (EEXIST);
149 }
150 return (ENOSPC);
151 case MEMRANGE_SET_REMOVE:
152 mtrr = 0;
153 for (d = 0; d < sc->mr_ndesc; d++)
154 if (sc->mr_desc[d].mr_base == desc->mr_base &&
155 sc->mr_desc[d].mr_len == desc->mr_len) {
156 bzero(&sc->mr_desc[d], sizeof(sc->mr_desc[d]));
157 goto out;
158 }
159 return (ENOENT);
160 default:
161 return (EOPNOTSUPP);
162 }
163 out:
164 disable_intr();
165 wbinvd();
166 reg = rdmsr(UWCCR);
167 reg &= ~(0xffffffff << (32 * d));
168 reg |= mtrr << (32 * d);
169 wrmsr(UWCCR, reg);
170 wbinvd();
171 enable_intr();
172
173 return (0);
174 }
175
176 static void
177 k6_mem_drvinit(void *unused)
178 {
179
180 if (cpu_vendor_id != CPU_VENDOR_AMD)
181 return;
182 if ((cpu_id & 0xf00) != 0x500)
183 return;
184 if ((cpu_id & 0xf0) < 0x80 ||
185 ((cpu_id & 0xf0) == 0x80 && (cpu_id & 0xf) <= 0x7))
186 return;
187 mem_range_softc.mr_op = &k6_mrops;
188 }
189 SYSINIT(k6memdev, SI_SUB_DRIVERS, SI_ORDER_FIRST, k6_mem_drvinit, NULL);
Cache object: 38a642c8520db505b4f8edc3647d903c
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