Annotation of sys/arch/i386/i386/k6_mem.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: k6_mem.c,v 1.7 2006/06/10 18:00:48 gwk Exp $ */
2: /*-
3: * Copyright (c) 1999 Brian Fundakowski Feldman
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
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 the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25: * SUCH DAMAGE.
26: *
27: * $FreeBSD: src/sys/i386/i386/k6_mem.c,v 1.4 1999/09/05 15:45:57 green Exp $
28: *
29: */
30:
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>
37:
38: #include <machine/cpufunc.h>
39: #include <machine/specialreg.h>
40:
41: /*
42: * A K6-2 MTRR is defined as the highest 15 bits having the address, the next
43: * 15 having the mask, the 1st bit being "write-combining" and the 0th bit
44: * being "uncacheable".
45: *
46: * Address Mask WC UC
47: * | XXXXXXXXXXXXXXX | XXXXXXXXXXXXXXX | X | X |
48: *
49: * There are two of these in the 64-bit UWCCR.
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: void k6_mrinit(struct mem_range_softc *sc);
64: int k6_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
65: __inline int k6_mrmake(struct mem_range_desc *, u_int32_t *);
66:
67: struct mem_range_ops k6_mrops = {
68: k6_mrinit,
69: k6_mrset,
70: NULL
71: };
72:
73: __inline int
74: k6_mrmake(struct mem_range_desc *desc, u_int32_t *mtrr)
75: {
76: u_int32_t len = 0, wc, uc;
77: int bit;
78:
79: if (desc->mr_base &~ 0xfffe0000)
80: return EINVAL;
81: if (desc->mr_len < 131072 || !powerof2(desc->mr_len))
82: return EINVAL;
83: if (desc->mr_flags &~ (MDF_WRITECOMBINE|MDF_UNCACHEABLE))
84: return EOPNOTSUPP;
85:
86: for (bit = ffs(desc->mr_len >> 17) - 1; bit < 15; bit++)
87: len |= 1 << bit;
88: wc = (desc->mr_flags & MDF_WRITECOMBINE) ? 1 : 0;
89: uc = (desc->mr_flags & MDF_UNCACHEABLE) ? 1 : 0;
90:
91: *mtrr = k6_reg_make(desc->mr_base, len, wc, uc);
92: return 0;
93: }
94:
95: void
96: k6_mrinit(struct mem_range_softc *sc)
97: {
98: u_int64_t reg;
99: u_int32_t addr, mask, wc, uc;
100: int d;
101:
102: sc->mr_cap = 0;
103: sc->mr_ndesc = 2; /* XXX (BFF) For now, we only have one msr for this */
104: sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
105: M_MEMDESC, M_NOWAIT);
106: if (sc->mr_desc == NULL)
107: panic("k6_mrinit: malloc returns NULL");
108:
109: bzero(sc->mr_desc, sc->mr_ndesc * sizeof(struct mem_range_desc));
110:
111: reg = rdmsr(UWCCR);
112: for (d = 0; d < sc->mr_ndesc; d++) {
113: u_int32_t one = (reg & (0xffffffff << (32 * d))) >> (32 * d);
114:
115: k6_reg_get(one, addr, mask, wc, uc);
116: sc->mr_desc[d].mr_base = addr;
117: sc->mr_desc[d].mr_len = ffs(mask) << 17;
118: if (wc)
119: sc->mr_desc[d].mr_flags |= MDF_WRITECOMBINE;
120: if (uc)
121: sc->mr_desc[d].mr_flags |= MDF_UNCACHEABLE;
122: }
123:
124: printf("mtrr: K6-family MTRR support (%d registers)\n", sc->mr_ndesc);
125: }
126:
127: int
128: k6_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
129: {
130: u_int64_t reg;
131: u_int32_t mtrr;
132: int error, d;
133:
134: switch (*arg) {
135: case MEMRANGE_SET_UPDATE:
136: error = k6_mrmake(desc, &mtrr);
137: if (error)
138: return error;
139: for (d = 0; d < sc->mr_ndesc; d++) {
140: if (!sc->mr_desc[d].mr_len) {
141: sc->mr_desc[d] = *desc;
142: goto out;
143: }
144: if (sc->mr_desc[d].mr_base == desc->mr_base &&
145: sc->mr_desc[d].mr_len == desc->mr_len)
146: return EEXIST;
147: }
148:
149: return ENOSPC;
150: case MEMRANGE_SET_REMOVE:
151: mtrr = 0;
152: for (d = 0; d < sc->mr_ndesc; d++)
153: if (sc->mr_desc[d].mr_base == desc->mr_base &&
154: sc->mr_desc[d].mr_len == desc->mr_len) {
155: bzero(&sc->mr_desc[d], sizeof(sc->mr_desc[d]));
156: goto out;
157: }
158:
159: return ENOENT;
160: default:
161: return EOPNOTSUPP;
162: }
163:
164: out:
165:
166: disable_intr();
167: wbinvd();
168: reg = rdmsr(UWCCR);
169: reg &= ~(0xffffffff << (32 * d));
170: reg |= mtrr << (32 * d);
171: wrmsr(UWCCR, reg);
172: wbinvd();
173: enable_intr();
174:
175: return 0;
176: }
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