2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Sepherosa Ziehau <sepherosa@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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
35 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/systm.h>
39 #include <machine/pmap.h>
42 #include "acpi_sdt_var.h"
44 #define SDT_VPRINTF(fmt, arg...) \
47 kprintf("ACPI SDT: " fmt , ##arg); \
50 #define ACPI_RSDP_EBDA_MAPSZ 1024
51 #define ACPI_RSDP_BIOS_MAPSZ 0x20000
52 #define ACPI_RSDP_BIOS_MAPADDR 0xe0000
54 #define ACPI_RSDP_ALIGN 16
56 #define ACPI_RSDP_SIGLEN 8
57 #define ACPI_RSDP_SIG "RSD PTR "
59 /* Root System Description Pointer */
61 uint8_t rsdp_sig[ACPI_RSDP_SIGLEN];
63 uint8_t rsdp_oem_id[6];
68 uint8_t rsdp_ext_cksum;
72 /* Extended System Description Table */
74 struct acpi_sdth xsdt_hdr;
75 uint64_t xsdt_ents[1];
78 /* Root System Description Table */
80 struct acpi_sdth rsdt_hdr;
81 uint32_t rsdt_ents[1];
84 typedef vm_paddr_t (*sdt_search_t)(vm_paddr_t, const uint8_t *);
86 static const struct acpi_rsdp *sdt_rsdp_search(const uint8_t *, int);
87 static vm_paddr_t sdt_search_xsdt(vm_paddr_t, const uint8_t *);
88 static vm_paddr_t sdt_search_rsdt(vm_paddr_t, const uint8_t *);
90 extern u_long ebda_addr;
92 static sdt_search_t sdt_search_func;
93 static vm_paddr_t sdt_search_paddr;
98 const struct acpi_rsdp *rsdp;
102 if (ebda_addr != 0) {
103 mapsz = ACPI_RSDP_EBDA_MAPSZ;
104 ptr = pmap_mapdev(ebda_addr, mapsz);
106 rsdp = sdt_rsdp_search(ptr, mapsz);
108 SDT_VPRINTF("RSDP not in EBDA\n");
109 pmap_unmapdev((vm_offset_t)ptr, mapsz);
114 SDT_VPRINTF("RSDP in EBDA\n");
119 mapsz = ACPI_RSDP_BIOS_MAPSZ;
120 ptr = pmap_mapdev(ACPI_RSDP_BIOS_MAPADDR, mapsz);
122 rsdp = sdt_rsdp_search(ptr, mapsz);
124 kprintf("sdt_probe: no RSDP\n");
125 pmap_unmapdev((vm_offset_t)ptr, mapsz);
128 SDT_VPRINTF("RSDP in BIOS mem\n");
132 if (rsdp->rsdp_rev != 2) {
133 sdt_search_func = sdt_search_rsdt;
134 sdt_search_paddr = rsdp->rsdp_rsdt;
136 sdt_search_func = sdt_search_xsdt;
137 sdt_search_paddr = rsdp->rsdp_xsdt;
139 pmap_unmapdev((vm_offset_t)ptr, mapsz);
141 SYSINIT(sdt_probe, SI_BOOT2_PRESMP, SI_ORDER_FIRST, sdt_probe, 0);
143 static const struct acpi_rsdp *
144 sdt_rsdp_search(const uint8_t *target, int size)
146 const struct acpi_rsdp *rsdp;
149 KKASSERT(size > sizeof(*rsdp));
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)
161 sdt_sdth_map(vm_paddr_t paddr)
163 struct acpi_sdth *sdth;
166 sdth = pmap_mapdev(paddr, sizeof(*sdth));
167 mapsz = sdth->sdth_len;
168 pmap_unmapdev((vm_offset_t)sdth, sizeof(*sdth));
170 if (mapsz < sizeof(*sdth))
173 return pmap_mapdev(paddr, mapsz);
177 sdt_sdth_unmap(struct acpi_sdth *sdth)
179 pmap_unmapdev((vm_offset_t)sdth, sdth->sdth_len);
183 sdt_search_xsdt(vm_paddr_t xsdt_paddr, const uint8_t *sig)
185 struct acpi_xsdt *xsdt;
186 vm_paddr_t sdt_paddr = 0;
189 if (xsdt_paddr == 0) {
190 kprintf("sdt_search_xsdt: XSDT paddr == 0\n");
194 xsdt = sdt_sdth_map(xsdt_paddr);
196 kprintf("sdt_search_xsdt: can't map XSDT\n");
200 if (memcmp(xsdt->xsdt_hdr.sdth_sig, ACPI_XSDT_SIG,
201 ACPI_SDTH_SIGLEN) != 0) {
202 kprintf("sdt_search_xsdt: not XSDT\n");
206 if (xsdt->xsdt_hdr.sdth_rev != 1) {
207 kprintf("sdt_search_xsdt: unknown XSDT revision %d\n",
208 xsdt->xsdt_hdr.sdth_rev);
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);
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;
222 if (xsdt->xsdt_ents[i] == 0)
225 sdth = sdt_sdth_map(xsdt->xsdt_ents[i]);
229 ret = memcmp(sdth->sdth_sig, sig, ACPI_SDTH_SIGLEN);
230 sdt_sdth_unmap(sdth);
233 sdt_paddr = xsdt->xsdt_ents[i];
239 sdt_sdth_unmap(&xsdt->xsdt_hdr);
244 sdt_search_rsdt(vm_paddr_t rsdt_paddr, const uint8_t *sig)
246 struct acpi_rsdt *rsdt;
247 vm_paddr_t sdt_paddr = 0;
250 if (rsdt_paddr == 0) {
251 kprintf("sdt_search_rsdt: RSDT paddr == 0\n");
255 rsdt = sdt_sdth_map(rsdt_paddr);
257 kprintf("sdt_search_rsdt: can't map RSDT\n");
261 if (memcmp(rsdt->rsdt_hdr.sdth_sig, ACPI_RSDT_SIG,
262 ACPI_SDTH_SIGLEN) != 0) {
263 kprintf("sdt_search_rsdt: not RSDT\n");
267 if (rsdt->rsdt_hdr.sdth_rev != 1) {
268 kprintf("sdt_search_rsdt: unknown RSDT revision %d\n",
269 rsdt->rsdt_hdr.sdth_rev);
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);
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;
283 if (rsdt->rsdt_ents[i] == 0)
286 sdth = sdt_sdth_map(rsdt->rsdt_ents[i]);
290 ret = memcmp(sdth->sdth_sig, sig, ACPI_SDTH_SIGLEN);
291 sdt_sdth_unmap(sdth);
294 sdt_paddr = rsdt->rsdt_ents[i];
300 sdt_sdth_unmap(&rsdt->rsdt_hdr);
305 sdt_search(const uint8_t *sig)
307 if (sdt_search_func == NULL)
309 return sdt_search_func(sdt_search_paddr, sig);