2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1999 Brian Fundakowski Feldman
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/systm.h>
35 #include <sys/malloc.h>
36 #include <sys/memrange.h>
38 #include <machine/cputypes.h>
39 #include <machine/md_var.h>
40 #include <machine/specialreg.h>
43 * A K6-2 MTRR is defined as the highest 15 bits having the address, the next
44 * 15 having the mask, the 1st bit being "write-combining" and the 0th bit
45 * being "uncacheable".
48 * | XXXXXXXXXXXXXXX | XXXXXXXXXXXXXXX | X | X |
50 * There are two of these in the 64-bit UWCCR.
53 #define UWCCR 0xc0000085
55 #define K6_REG_GET(reg, addr, mask, wc, uc) do { \
56 addr = (reg) & 0xfffe0000; \
57 mask = ((reg) & 0x1fffc) >> 2; \
58 wc = ((reg) & 0x2) >> 1; \
62 #define K6_REG_MAKE(addr, mask, wc, uc) \
63 ((addr) | ((mask) << 2) | ((wc) << 1) | uc)
65 static void k6_mrinit(struct mem_range_softc *sc);
66 static int k6_mrset(struct mem_range_softc *, struct mem_range_desc *,
68 static __inline int k6_mrmake(struct mem_range_desc *, u_int32_t *);
69 static void k6_mem_drvinit(void *);
71 static struct mem_range_ops k6_mrops =
80 k6_mrmake(struct mem_range_desc *desc, u_int32_t *mtrr)
82 u_int32_t len = 0, wc, uc;
85 if (desc->mr_base &~ 0xfffe0000)
87 if (desc->mr_len < 131072 || !powerof2(desc->mr_len))
89 if (desc->mr_flags &~ (MDF_WRITECOMBINE|MDF_UNCACHEABLE|MDF_FORCE))
92 for (bit = ffs(desc->mr_len >> 17) - 1; bit < 15; bit++)
94 wc = (desc->mr_flags & MDF_WRITECOMBINE) ? 1 : 0;
95 uc = (desc->mr_flags & MDF_UNCACHEABLE) ? 1 : 0;
97 *mtrr = K6_REG_MAKE(desc->mr_base, len, wc, uc);
102 k6_mrinit(struct mem_range_softc *sc)
105 u_int32_t addr, mask, wc, uc;
109 sc->mr_ndesc = 2; /* XXX (BFF) For now, we only have one msr for this */
110 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
111 M_MEMDESC, M_NOWAIT | M_ZERO);
112 if (sc->mr_desc == NULL)
113 panic("k6_mrinit: malloc returns NULL");
116 for (d = 0; d < sc->mr_ndesc; d++) {
117 u_int32_t one = (reg & (0xffffffff << (32 * d))) >> (32 * d);
119 K6_REG_GET(one, addr, mask, wc, uc);
120 sc->mr_desc[d].mr_base = addr;
121 sc->mr_desc[d].mr_len = ffs(mask) << 17;
123 sc->mr_desc[d].mr_flags |= MDF_WRITECOMBINE;
125 sc->mr_desc[d].mr_flags |= MDF_UNCACHEABLE;
128 printf("K6-family MTRR support enabled (%d registers)\n", sc->mr_ndesc);
132 k6_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
139 case MEMRANGE_SET_UPDATE:
140 error = k6_mrmake(desc, &mtrr);
143 for (d = 0; d < sc->mr_ndesc; d++) {
144 if (!sc->mr_desc[d].mr_len) {
145 sc->mr_desc[d] = *desc;
148 if (sc->mr_desc[d].mr_base == desc->mr_base &&
149 sc->mr_desc[d].mr_len == desc->mr_len)
153 case MEMRANGE_SET_REMOVE:
155 for (d = 0; d < sc->mr_ndesc; d++)
156 if (sc->mr_desc[d].mr_base == desc->mr_base &&
157 sc->mr_desc[d].mr_len == desc->mr_len) {
158 bzero(&sc->mr_desc[d], sizeof(sc->mr_desc[d]));
169 reg &= ~(0xffffffff << (32 * d));
170 reg |= mtrr << (32 * d);
179 k6_mem_drvinit(void *unused)
182 if (cpu_vendor_id != CPU_VENDOR_AMD)
184 if ((cpu_id & 0xf00) != 0x500)
186 if ((cpu_id & 0xf0) < 0x80 ||
187 ((cpu_id & 0xf0) == 0x80 && (cpu_id & 0xf) <= 0x7))
189 mem_range_softc.mr_op = &k6_mrops;
191 SYSINIT(k6memdev, SI_SUB_DRIVERS, SI_ORDER_FIRST, k6_mem_drvinit, NULL);