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/6.2/sys/i386/i386/k6_mem.c 119452 2003-08-25 09:48:48Z obrien $");
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/md_var.h>
37 #include <machine/specialreg.h>
38
39 /*
40 * A K6-2 MTRR is defined as the highest 15 bits having the address, the next
41 * 15 having the mask, the 1st bit being "write-combining" and the 0th bit
42 * being "uncacheable".
43 *
44 * Address Mask WC UC
45 * | XXXXXXXXXXXXXXX | XXXXXXXXXXXXXXX | X | X |
46 *
47 * There are two of these in the 64-bit UWCCR.
48 */
49
50 #define UWCCR 0xc0000085
51
52 #define K6_REG_GET(reg, addr, mask, wc, uc) do { \
53 addr = (reg) & 0xfffe0000; \
54 mask = ((reg) & 0x1fffc) >> 2; \
55 wc = ((reg) & 0x2) >> 1; \
56 uc = (reg) & 0x1; \
57 } while (0)
58
59 #define K6_REG_MAKE(addr, mask, wc, uc) \
60 ((addr) | ((mask) << 2) | ((wc) << 1) | uc)
61
62 static void k6_mrinit(struct mem_range_softc *sc);
63 static int k6_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
64 static __inline int k6_mrmake(struct mem_range_desc *, u_int32_t *);
65 static void k6_mem_drvinit(void *);
66
67 static struct mem_range_ops k6_mrops = {
68 k6_mrinit,
69 k6_mrset,
70 NULL
71 };
72
73 static __inline int
74 k6_mrmake(struct mem_range_desc *desc, u_int32_t *mtrr) {
75 u_int32_t len = 0, wc, uc;
76 register int bit;
77
78 if (desc->mr_base &~ 0xfffe0000)
79 return EINVAL;
80 if (desc->mr_len < 131072 || !powerof2(desc->mr_len))
81 return EINVAL;
82 if (desc->mr_flags &~ (MDF_WRITECOMBINE|MDF_UNCACHEABLE|MDF_FORCE))
83 return EOPNOTSUPP;
84
85 for (bit = ffs(desc->mr_len >> 17) - 1; bit < 15; bit++)
86 len |= 1 << bit;
87 wc = (desc->mr_flags & MDF_WRITECOMBINE) ? 1 : 0;
88 uc = (desc->mr_flags & MDF_UNCACHEABLE) ? 1 : 0;
89
90 *mtrr = K6_REG_MAKE(desc->mr_base, len, wc, uc);
91 return 0;
92 }
93
94 static void
95 k6_mrinit(struct mem_range_softc *sc) {
96 u_int64_t reg;
97 u_int32_t addr, mask, wc, uc;
98 int d;
99
100 sc->mr_cap = 0;
101 sc->mr_ndesc = 2; /* XXX (BFF) For now, we only have one msr for this */
102 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
103 M_MEMDESC, M_NOWAIT | M_ZERO);
104 if (sc->mr_desc == NULL)
105 panic("k6_mrinit: malloc returns NULL");
106
107 reg = rdmsr(UWCCR);
108 for (d = 0; d < sc->mr_ndesc; d++) {
109 u_int32_t one = (reg & (0xffffffff << (32 * d))) >> (32 * d);
110
111 K6_REG_GET(one, addr, mask, wc, uc);
112 sc->mr_desc[d].mr_base = addr;
113 sc->mr_desc[d].mr_len = ffs(mask) << 17;
114 if (wc)
115 sc->mr_desc[d].mr_flags |= MDF_WRITECOMBINE;
116 if (uc)
117 sc->mr_desc[d].mr_flags |= MDF_UNCACHEABLE;
118 }
119
120 printf("K6-family MTRR support enabled (%d registers)\n", sc->mr_ndesc);
121 }
122
123 static int
124 k6_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg) {
125 u_int64_t reg;
126 u_int32_t mtrr;
127 int error, d;
128
129 switch (*arg) {
130 case MEMRANGE_SET_UPDATE:
131 error = k6_mrmake(desc, &mtrr);
132 if (error)
133 return error;
134 for (d = 0; d < sc->mr_ndesc; d++) {
135 if (!sc->mr_desc[d].mr_len) {
136 sc->mr_desc[d] = *desc;
137 goto out;
138 }
139 if (sc->mr_desc[d].mr_base == desc->mr_base &&
140 sc->mr_desc[d].mr_len == desc->mr_len)
141 return EEXIST;
142 }
143
144 return ENOSPC;
145 case MEMRANGE_SET_REMOVE:
146 mtrr = 0;
147 for (d = 0; d < sc->mr_ndesc; d++)
148 if (sc->mr_desc[d].mr_base == desc->mr_base &&
149 sc->mr_desc[d].mr_len == desc->mr_len) {
150 bzero(&sc->mr_desc[d], sizeof(sc->mr_desc[d]));
151 goto out;
152 }
153
154 return ENOENT;
155 default:
156 return EOPNOTSUPP;
157 }
158
159 out:
160
161 disable_intr();
162 wbinvd();
163 reg = rdmsr(UWCCR);
164 reg &= ~(0xffffffff << (32 * d));
165 reg |= mtrr << (32 * d);
166 wrmsr(UWCCR, reg);
167 wbinvd();
168 enable_intr();
169
170 return 0;
171 }
172
173 static void
174 k6_mem_drvinit(void *unused) {
175 if (!strcmp(cpu_vendor, "AuthenticAMD") &&
176 (cpu_id & 0xf00) == 0x500 &&
177 ((cpu_id & 0xf0) > 0x80 ||
178 ((cpu_id & 0xf0) == 0x80 &&
179 (cpu_id & 0xf) > 0x7))
180 )
181 mem_range_softc.mr_op = &k6_mrops;
182 }
183
184 SYSINIT(k6memdev, SI_SUB_DRIVERS, SI_ORDER_FIRST, k6_mem_drvinit, NULL)
Cache object: e228a0512ce37e2272e05142e016f0a0
|