acpi_quirk.c revision 167814 
1/*-
2 * Copyright (c) 2004 Nate Lawson (SDG)
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: head/sys/dev/acpica/acpi_quirk.c 167814 2007-03-22 18:16:43Z jkim $");
29
30#include <sys/param.h>
31#include <sys/bus.h>
32
33#include <contrib/dev/acpica/acpi.h>
34#include <dev/acpica/acpivar.h>
35
36enum ops_t {
37	OP_NONE,
38	OP_LEQ,
39	OP_GEQ,
40	OP_EQL,
41};
42
43enum val_t {
44	OEM,
45	OEM_REV,
46	CREATOR,
47	CREATOR_REV,
48};
49
50struct acpi_q_rule {
51    char	sig[ACPI_NAME_SIZE];	/* Table signature to match */
52    enum val_t	val;
53    union {
54	char	*id;
55	enum ops_t op;
56    } x;
57    union {
58	char	*tid;
59	int	rev;
60    } y;
61};
62
63struct acpi_q_entry {
64    const struct acpi_q_rule *match;
65    int		quirks;
66};
67
68#include "acpi_quirks.h"
69
70static int	aq_revcmp(int revision, enum ops_t op, int value);
71static int	aq_strcmp(char *actual, char *possible);
72static int	aq_match_header(ACPI_TABLE_HEADER *hdr,
73		    const struct acpi_q_rule *match);
74
75static int
76aq_revcmp(int revision, enum ops_t op, int value)
77{
78    switch (op) {
79    case OP_LEQ:
80	if (revision <= value)
81	    return (TRUE);
82	break;
83    case OP_GEQ:
84	if (revision >= value)
85	    return (TRUE);
86	break;
87    case OP_EQL:
88	if (revision == value)
89	    return (TRUE);
90	break;
91    case OP_NONE:
92	return (TRUE);
93    default:
94	panic("aq_revcmp: invalid op %d", op);
95    }
96
97    return (FALSE);
98}
99
100static int
101aq_strcmp(char *actual, char *possible)
102{
103    if (actual == NULL || possible == NULL)
104	return (TRUE);
105    return (strncmp(actual, possible, strlen(possible)) == 0);
106}
107
108static int
109aq_match_header(ACPI_TABLE_HEADER *hdr, const struct acpi_q_rule *match)
110{
111    int result;
112
113    result = FALSE;
114    switch (match->val) {
115    case OEM:
116	if (aq_strcmp(hdr->OemId, match->x.id) &&
117	    aq_strcmp(hdr->OemTableId, match->y.tid))
118	    result = TRUE;
119	break;
120    case CREATOR:
121	if (aq_strcmp(hdr->AslCompilerId, match->x.id))
122	    result = TRUE;
123	break;
124    case OEM_REV:
125	if (aq_revcmp(hdr->OemRevision, match->x.op, match->y.rev))
126	    result = TRUE;
127	break;
128    case CREATOR_REV:
129	if (aq_revcmp(hdr->AslCompilerRevision, match->x.op, match->y.rev))
130	    result = TRUE;
131	break;
132    }
133
134    return (result);
135}
136
137int
138acpi_table_quirks(int *quirks)
139{
140    const struct acpi_q_entry *entry;
141    const struct acpi_q_rule *match;
142    ACPI_TABLE_HEADER fadt, dsdt, xsdt, *hdr;
143    int done;
144
145    /* First, allow the machdep system to set its idea of quirks. */
146    KASSERT(quirks != NULL, ("acpi quirks ptr is NULL"));
147    acpi_machdep_quirks(quirks);
148
149    if (ACPI_FAILURE(AcpiGetTableHeader(ACPI_SIG_FADT, 0, &fadt)))
150	bzero(&fadt, sizeof(fadt));
151    if (ACPI_FAILURE(AcpiGetTableHeader(ACPI_SIG_DSDT, 0, &dsdt)))
152	bzero(&fadt, sizeof(dsdt));
153    if (ACPI_FAILURE(AcpiGetTableHeader(ACPI_SIG_XSDT, 0, &xsdt)))
154	bzero(&fadt, sizeof(xsdt));
155
156    /* Then, override the quirks with any matched from table signatures. */
157    for (entry = acpi_quirks_table; entry->match; entry++) {
158	done = TRUE;
159	for (match = entry->match; match->sig[0] != '\0'; match++) {
160	    if (!strncmp(match->sig, "FADT", ACPI_NAME_SIZE))
161		hdr = &fadt;
162	    else if (!strncmp(match->sig, ACPI_SIG_DSDT, ACPI_NAME_SIZE))
163		hdr = &dsdt;
164	    else if (!strncmp(match->sig, ACPI_SIG_XSDT, ACPI_NAME_SIZE))
165		hdr = &xsdt;
166	    else
167		panic("invalid quirk header\n");
168
169	    /* If we don't match any, skip to the next entry. */
170	    if (aq_match_header(hdr, match) == FALSE) {
171		done = FALSE;
172		break;
173	    }
174	}
175
176	/* If all entries matched, update the quirks and return. */
177	if (done) {
178	    *quirks = entry->quirks;
179	    break;
180	}
181    }
182
183    return (0);
184}
185