acpi: Be lenient about unknown revision of FADT, MADT, XSDT and RSDT
[dragonfly.git] / sys / platform / pc64 / acpica / acpi_sdt.c
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1/*
2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Sepherosa Ziehau <sepherosa@gmail.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/param.h>
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36#include <sys/kernel.h>
37#include <sys/systm.h>
38
39#include <machine/pmap.h>
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40
41#include "acpi_sdt.h"
42#include "acpi_sdt_var.h"
43
44#define SDT_VPRINTF(fmt, arg...) \
45do { \
46 if (bootverbose) \
47 kprintf("ACPI SDT: " fmt , ##arg); \
48} while (0)
49
50#define ACPI_RSDP_EBDA_MAPSZ 1024
51#define ACPI_RSDP_BIOS_MAPSZ 0x20000
52#define ACPI_RSDP_BIOS_MAPADDR 0xe0000
53
54#define ACPI_RSDP_ALIGN 16
55
56#define ACPI_RSDP_SIGLEN 8
57#define ACPI_RSDP_SIG "RSD PTR "
58
59/* Root System Description Pointer */
60struct acpi_rsdp {
61 uint8_t rsdp_sig[ACPI_RSDP_SIGLEN];
62 uint8_t rsdp_cksum;
63 uint8_t rsdp_oem_id[6];
64 uint8_t rsdp_rev;
65 uint32_t rsdp_rsdt;
66 uint32_t rsdp_len;
67 uint64_t rsdp_xsdt;
68 uint8_t rsdp_ext_cksum;
69 uint8_t rsdp_rsvd[3];
70} __packed;
71
72/* Extended System Description Table */
73struct acpi_xsdt {
74 struct acpi_sdth xsdt_hdr;
75 uint64_t xsdt_ents[1];
76} __packed;
77
78/* Root System Description Table */
79struct acpi_rsdt {
80 struct acpi_sdth rsdt_hdr;
81 uint32_t rsdt_ents[1];
82} __packed;
83
84typedef vm_paddr_t (*sdt_search_t)(vm_paddr_t, const uint8_t *);
85
86static const struct acpi_rsdp *sdt_rsdp_search(const uint8_t *, int);
87static vm_paddr_t sdt_search_xsdt(vm_paddr_t, const uint8_t *);
88static vm_paddr_t sdt_search_rsdt(vm_paddr_t, const uint8_t *);
89
90extern u_long ebda_addr;
91
92static sdt_search_t sdt_search_func;
93static vm_paddr_t sdt_search_paddr;
94
95static void
96sdt_probe(void)
97{
98 const struct acpi_rsdp *rsdp;
99 vm_size_t mapsz;
100 uint8_t *ptr;
101
102 if (ebda_addr != 0) {
103 mapsz = ACPI_RSDP_EBDA_MAPSZ;
104 ptr = pmap_mapdev(ebda_addr, mapsz);
105
106 rsdp = sdt_rsdp_search(ptr, mapsz);
107 if (rsdp == NULL) {
108 SDT_VPRINTF("RSDP not in EBDA\n");
109 pmap_unmapdev((vm_offset_t)ptr, mapsz);
110
111 ptr = NULL;
112 mapsz = 0;
113 } else {
114 SDT_VPRINTF("RSDP in EBDA\n");
115 goto found_rsdp;
116 }
117 }
118
119 mapsz = ACPI_RSDP_BIOS_MAPSZ;
120 ptr = pmap_mapdev(ACPI_RSDP_BIOS_MAPADDR, mapsz);
121
122 rsdp = sdt_rsdp_search(ptr, mapsz);
123 if (rsdp == NULL) {
124 kprintf("sdt_probe: no RSDP\n");
125 pmap_unmapdev((vm_offset_t)ptr, mapsz);
126 return;
127 } else {
128 SDT_VPRINTF("RSDP in BIOS mem\n");
129 }
130
131found_rsdp:
132 if (rsdp->rsdp_rev != 2) {
133 sdt_search_func = sdt_search_rsdt;
134 sdt_search_paddr = rsdp->rsdp_rsdt;
135 } else {
136 sdt_search_func = sdt_search_xsdt;
137 sdt_search_paddr = rsdp->rsdp_xsdt;
138 }
139 pmap_unmapdev((vm_offset_t)ptr, mapsz);
140}
141SYSINIT(sdt_probe, SI_BOOT2_PRESMP, SI_ORDER_FIRST, sdt_probe, 0);
142
143static const struct acpi_rsdp *
144sdt_rsdp_search(const uint8_t *target, int size)
145{
146 const struct acpi_rsdp *rsdp;
147 int i;
148
149 KKASSERT(size > sizeof(*rsdp));
150
151 for (i = 0; i < size - sizeof(*rsdp); i += ACPI_RSDP_ALIGN) {
152 rsdp = (const struct acpi_rsdp *)&target[i];
153 if (memcmp(rsdp->rsdp_sig, ACPI_RSDP_SIG,
154 ACPI_RSDP_SIGLEN) == 0)
155 return rsdp;
156 }
157 return NULL;
158}
159
160void *
161sdt_sdth_map(vm_paddr_t paddr)
162{
163 struct acpi_sdth *sdth;
164 vm_size_t mapsz;
165
166 sdth = pmap_mapdev(paddr, sizeof(*sdth));
167 mapsz = sdth->sdth_len;
168 pmap_unmapdev((vm_offset_t)sdth, sizeof(*sdth));
169
170 if (mapsz < sizeof(*sdth))
171 return NULL;
172
173 return pmap_mapdev(paddr, mapsz);
174}
175
176void
177sdt_sdth_unmap(struct acpi_sdth *sdth)
178{
179 pmap_unmapdev((vm_offset_t)sdth, sdth->sdth_len);
180}
181
182static vm_paddr_t
183sdt_search_xsdt(vm_paddr_t xsdt_paddr, const uint8_t *sig)
184{
185 struct acpi_xsdt *xsdt;
186 vm_paddr_t sdt_paddr = 0;
187 int i, nent;
188
189 if (xsdt_paddr == 0) {
190 kprintf("sdt_search_xsdt: XSDT paddr == 0\n");
191 return 0;
192 }
193
194 xsdt = sdt_sdth_map(xsdt_paddr);
195 if (xsdt == NULL) {
196 kprintf("sdt_search_xsdt: can't map XSDT\n");
197 return 0;
198 }
199
200 if (memcmp(xsdt->xsdt_hdr.sdth_sig, ACPI_XSDT_SIG,
201 ACPI_SDTH_SIGLEN) != 0) {
202 kprintf("sdt_search_xsdt: not XSDT\n");
203 goto back;
204 }
205
206 if (xsdt->xsdt_hdr.sdth_rev != 1) {
fa90647a 207 kprintf("sdt_search_xsdt: unknown XSDT revision %d\n",
d6c62a5d 208 xsdt->xsdt_hdr.sdth_rev);
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209 }
210
211 if (xsdt->xsdt_hdr.sdth_len < sizeof(xsdt->xsdt_hdr)) {
212 kprintf("sdt_search_xsdt: invalid XSDT length %u\n",
213 xsdt->xsdt_hdr.sdth_len);
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214 goto back;
215 }
216
217 nent = (xsdt->xsdt_hdr.sdth_len - sizeof(xsdt->xsdt_hdr)) /
218 sizeof(xsdt->xsdt_ents[0]);
219 for (i = 0; i < nent; ++i) {
220 struct acpi_sdth *sdth;
221
222 if (xsdt->xsdt_ents[i] == 0)
223 continue;
224
225 sdth = sdt_sdth_map(xsdt->xsdt_ents[i]);
226 if (sdth != NULL) {
227 int ret;
228
229 ret = memcmp(sdth->sdth_sig, sig, ACPI_SDTH_SIGLEN);
230 sdt_sdth_unmap(sdth);
231
232 if (ret == 0) {
233 sdt_paddr = xsdt->xsdt_ents[i];
234 break;
235 }
236 }
237 }
238back:
239 sdt_sdth_unmap(&xsdt->xsdt_hdr);
240 return sdt_paddr;
241}
242
243static vm_paddr_t
244sdt_search_rsdt(vm_paddr_t rsdt_paddr, const uint8_t *sig)
245{
246 struct acpi_rsdt *rsdt;
247 vm_paddr_t sdt_paddr = 0;
248 int i, nent;
249
250 if (rsdt_paddr == 0) {
251 kprintf("sdt_search_rsdt: RSDT paddr == 0\n");
252 return 0;
253 }
254
255 rsdt = sdt_sdth_map(rsdt_paddr);
256 if (rsdt == NULL) {
257 kprintf("sdt_search_rsdt: can't map RSDT\n");
258 return 0;
259 }
260
261 if (memcmp(rsdt->rsdt_hdr.sdth_sig, ACPI_RSDT_SIG,
262 ACPI_SDTH_SIGLEN) != 0) {
263 kprintf("sdt_search_rsdt: not RSDT\n");
264 goto back;
265 }
266
267 if (rsdt->rsdt_hdr.sdth_rev != 1) {
fa90647a 268 kprintf("sdt_search_rsdt: unknown RSDT revision %d\n",
d6c62a5d 269 rsdt->rsdt_hdr.sdth_rev);
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270 }
271
272 if (rsdt->rsdt_hdr.sdth_len < sizeof(rsdt->rsdt_hdr)) {
273 kprintf("sdt_search_rsdt: invalid RSDT length %u\n",
274 rsdt->rsdt_hdr.sdth_len);
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275 goto back;
276 }
277
278 nent = (rsdt->rsdt_hdr.sdth_len - sizeof(rsdt->rsdt_hdr)) /
279 sizeof(rsdt->rsdt_ents[0]);
280 for (i = 0; i < nent; ++i) {
281 struct acpi_sdth *sdth;
282
283 if (rsdt->rsdt_ents[i] == 0)
284 continue;
285
286 sdth = sdt_sdth_map(rsdt->rsdt_ents[i]);
287 if (sdth != NULL) {
288 int ret;
289
290 ret = memcmp(sdth->sdth_sig, sig, ACPI_SDTH_SIGLEN);
291 sdt_sdth_unmap(sdth);
292
293 if (ret == 0) {
294 sdt_paddr = rsdt->rsdt_ents[i];
295 break;
296 }
297 }
298 }
299back:
300 sdt_sdth_unmap(&rsdt->rsdt_hdr);
301 return sdt_paddr;
302}
303
304vm_paddr_t
305sdt_search(const uint8_t *sig)
306{
307 if (sdt_search_func == NULL)
308 return 0;
309 return sdt_search_func(sdt_search_paddr, sig);
310}