2 * Copyright (c) 1999 Brian Fundakowski Feldman
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $FreeBSD: src/sys/i386/i386/k6_mem.c,v 1.4.2.2 2002/09/16 21:58:41 dwmalone Exp $
27 * $DragonFly: src/sys/platform/pc32/i386/k6_mem.c,v 1.5 2005/01/06 08:33:11 asmodai Exp $
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
34 #include <sys/ioccom.h>
35 #include <sys/malloc.h>
36 #include <sys/memrange.h>
38 #include <machine/md_var.h>
39 #include <machine/specialreg.h>
40 #include <machine/lock.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.
54 * NOTE: I do _not_ comment my code unless it's truly necessary. Don't
55 * expect anything frivolous here, and do NOT touch my bit-shifts
56 * unless you want to break this.
59 #define UWCCR 0xc0000085
61 #define k6_reg_get(reg, addr, mask, wc, uc) do { \
62 addr = (reg) & 0xfffe0000; \
63 mask = ((reg) & 0x1fffc) >> 2; \
64 wc = ((reg) & 0x2) >> 1; \
68 #define k6_reg_make(addr, mask, wc, uc) \
69 ((addr) | ((mask) << 2) | ((wc) << 1) | uc)
71 static void k6_mrinit(struct mem_range_softc *sc);
72 static int k6_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
73 static __inline int k6_mrmake(struct mem_range_desc *, u_int32_t *);
74 static void k6_mem_drvinit(void *);
76 static struct mem_range_ops k6_mrops = {
83 k6_mrmake(struct mem_range_desc *desc, u_int32_t *mtrr) {
84 u_int32_t len = 0, wc, uc;
87 if (desc->mr_base &~ 0xfffe0000)
89 if (desc->mr_len < 131072 || !powerof2(desc->mr_len))
91 if (desc->mr_flags &~ (MDF_WRITECOMBINE|MDF_UNCACHEABLE|MDF_FORCE))
94 for (bit = ffs(desc->mr_len >> 17) - 1; bit < 15; bit++)
96 wc = (desc->mr_flags & MDF_WRITECOMBINE) ? 1 : 0;
97 uc = (desc->mr_flags & MDF_UNCACHEABLE) ? 1 : 0;
99 *mtrr = k6_reg_make(desc->mr_base, len, wc, uc);
104 k6_mrinit(struct mem_range_softc *sc) {
106 u_int32_t addr, mask, wc, uc;
110 sc->mr_ndesc = 2; /* XXX (BFF) For now, we only have one msr for this */
111 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
112 M_MEMDESC, M_WAITOK);
113 if (sc->mr_desc == NULL)
114 panic("k6_mrinit: malloc returns NULL");
115 bzero(sc->mr_desc, sc->mr_ndesc * sizeof(struct mem_range_desc));
118 for (d = 0; d < sc->mr_ndesc; d++) {
119 u_int32_t one = (reg & (0xffffffff << (32 * d))) >> (32 * d);
121 k6_reg_get(one, addr, mask, wc, uc);
122 sc->mr_desc[d].mr_base = addr;
123 sc->mr_desc[d].mr_len = ffs(mask) << 17;
125 sc->mr_desc[d].mr_flags |= MDF_WRITECOMBINE;
127 sc->mr_desc[d].mr_flags |= MDF_UNCACHEABLE;
130 printf("K6-family MTRR support enabled (%d registers)\n", sc->mr_ndesc);
134 k6_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg) {
140 case MEMRANGE_SET_UPDATE:
141 error = k6_mrmake(desc, &mtrr);
144 for (d = 0; d < sc->mr_ndesc; d++) {
145 if (!sc->mr_desc[d].mr_len) {
146 sc->mr_desc[d] = *desc;
149 if (sc->mr_desc[d].mr_base == desc->mr_base &&
150 sc->mr_desc[d].mr_len == desc->mr_len)
155 case MEMRANGE_SET_REMOVE:
157 for (d = 0; d < sc->mr_ndesc; d++)
158 if (sc->mr_desc[d].mr_base == desc->mr_base &&
159 sc->mr_desc[d].mr_len == desc->mr_len) {
160 bzero(&sc->mr_desc[d], sizeof(sc->mr_desc[d]));
174 reg &= ~(0xffffffff << (32 * d));
175 reg |= mtrr << (32 * d);
184 k6_mem_drvinit(void *unused) {
185 if (!strcmp(cpu_vendor, "AuthenticAMD") &&
186 (cpu_id & 0xf00) == 0x500 &&
187 ((cpu_id & 0xf0) > 0x80 ||
188 ((cpu_id & 0xf0) == 0x80 &&
189 (cpu_id & 0xf) > 0x7))
191 mem_range_softc.mr_op = &k6_mrops;
194 SYSINIT(k6memdev, SI_SUB_DRIVERS, SI_ORDER_FIRST, k6_mem_drvinit, NULL)