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>
37 #include <sys/kernel.h>
38 #include <sys/systm.h>
40 #include <machine/pmap.h>
41 #include <machine/smp.h>
42 #include <machine/md_var.h>
43 #include <machine/specialreg.h>
46 #include "acpi_sdt_var.h"
48 #define SDT_VPRINTF(fmt, arg...) \
51 kprintf("ACPI SDT: " fmt , ##arg); \
54 #define ACPI_RSDP_EBDA_MAPSZ 1024
55 #define ACPI_RSDP_BIOS_MAPSZ 0x20000
56 #define ACPI_RSDP_BIOS_MAPADDR 0xe0000
58 #define ACPI_RSDP_ALIGN 16
60 #define ACPI_RSDP_SIGLEN 8
61 #define ACPI_RSDP_SIG "RSD PTR "
63 /* Root System Description Pointer */
65 uint8_t rsdp_sig[ACPI_RSDP_SIGLEN];
67 uint8_t rsdp_oem_id[6];
72 uint8_t rsdp_ext_cksum;
76 /* Extended System Description Table */
78 struct acpi_sdth xsdt_hdr;
79 uint64_t xsdt_ents[1];
82 /* Root System Description Table */
84 struct acpi_sdth rsdt_hdr;
85 uint32_t rsdt_ents[1];
88 typedef vm_paddr_t (*sdt_search_t)(vm_paddr_t, const uint8_t *);
90 static const struct acpi_rsdp *sdt_rsdp_search(const uint8_t *, int);
91 static vm_paddr_t sdt_search_xsdt(vm_paddr_t, const uint8_t *);
92 static vm_paddr_t sdt_search_rsdt(vm_paddr_t, const uint8_t *);
94 extern u_long ebda_addr;
96 static sdt_search_t sdt_search_func;
97 static vm_paddr_t sdt_search_paddr;
102 const struct acpi_rsdp *rsdp;
106 if (ebda_addr != 0) {
107 mapsz = ACPI_RSDP_EBDA_MAPSZ;
108 ptr = pmap_mapdev(ebda_addr, mapsz);
110 rsdp = sdt_rsdp_search(ptr, mapsz);
112 SDT_VPRINTF("RSDP not in EBDA\n");
113 pmap_unmapdev((vm_offset_t)ptr, mapsz);
118 SDT_VPRINTF("RSDP in EBDA\n");
123 mapsz = ACPI_RSDP_BIOS_MAPSZ;
124 ptr = pmap_mapdev(ACPI_RSDP_BIOS_MAPADDR, mapsz);
126 rsdp = sdt_rsdp_search(ptr, mapsz);
128 kprintf("sdt_probe: no RSDP\n");
129 pmap_unmapdev((vm_offset_t)ptr, mapsz);
132 SDT_VPRINTF("RSDP in BIOS mem\n");
136 if (rsdp->rsdp_rev != 2) {
137 sdt_search_func = sdt_search_rsdt;
138 sdt_search_paddr = rsdp->rsdp_rsdt;
140 sdt_search_func = sdt_search_xsdt;
141 sdt_search_paddr = rsdp->rsdp_xsdt;
143 pmap_unmapdev((vm_offset_t)ptr, mapsz);
145 SYSINIT(sdt_probe, SI_BOOT2_PRESMP, SI_ORDER_FIRST, sdt_probe, 0);
147 static const struct acpi_rsdp *
148 sdt_rsdp_search(const uint8_t *target, int size)
150 const struct acpi_rsdp *rsdp;
153 KKASSERT(size > sizeof(*rsdp));
155 for (i = 0; i < size - sizeof(*rsdp); i += ACPI_RSDP_ALIGN) {
156 rsdp = (const struct acpi_rsdp *)&target[i];
157 if (memcmp(rsdp->rsdp_sig, ACPI_RSDP_SIG,
158 ACPI_RSDP_SIGLEN) == 0)
165 sdt_sdth_map(vm_paddr_t paddr)
167 struct acpi_sdth *sdth;
170 sdth = pmap_mapdev(paddr, sizeof(*sdth));
171 mapsz = sdth->sdth_len;
172 pmap_unmapdev((vm_offset_t)sdth, sizeof(*sdth));
174 if (mapsz < sizeof(*sdth))
177 return pmap_mapdev(paddr, mapsz);
181 sdt_sdth_unmap(struct acpi_sdth *sdth)
183 pmap_unmapdev((vm_offset_t)sdth, sdth->sdth_len);
187 sdt_search_xsdt(vm_paddr_t xsdt_paddr, const uint8_t *sig)
189 struct acpi_xsdt *xsdt;
190 vm_paddr_t sdt_paddr = 0;
193 if (xsdt_paddr == 0) {
194 kprintf("sdt_search_xsdt: XSDT paddr == 0\n");
198 xsdt = sdt_sdth_map(xsdt_paddr);
200 kprintf("sdt_search_xsdt: can't map XSDT\n");
204 if (memcmp(xsdt->xsdt_hdr.sdth_sig, ACPI_XSDT_SIG,
205 ACPI_SDTH_SIGLEN) != 0) {
206 kprintf("sdt_search_xsdt: not XSDT\n");
210 if (xsdt->xsdt_hdr.sdth_rev != 1) {
211 kprintf("sdt_search_xsdt: unsupported XSDT revision %d\n",
212 xsdt->xsdt_hdr.sdth_rev);
216 nent = (xsdt->xsdt_hdr.sdth_len - sizeof(xsdt->xsdt_hdr)) /
217 sizeof(xsdt->xsdt_ents[0]);
218 for (i = 0; i < nent; ++i) {
219 struct acpi_sdth *sdth;
221 if (xsdt->xsdt_ents[i] == 0)
224 sdth = sdt_sdth_map(xsdt->xsdt_ents[i]);
228 ret = memcmp(sdth->sdth_sig, sig, ACPI_SDTH_SIGLEN);
229 sdt_sdth_unmap(sdth);
232 sdt_paddr = xsdt->xsdt_ents[i];
238 sdt_sdth_unmap(&xsdt->xsdt_hdr);
243 sdt_search_rsdt(vm_paddr_t rsdt_paddr, const uint8_t *sig)
245 struct acpi_rsdt *rsdt;
246 vm_paddr_t sdt_paddr = 0;
249 if (rsdt_paddr == 0) {
250 kprintf("sdt_search_rsdt: RSDT paddr == 0\n");
254 rsdt = sdt_sdth_map(rsdt_paddr);
256 kprintf("sdt_search_rsdt: can't map RSDT\n");
260 if (memcmp(rsdt->rsdt_hdr.sdth_sig, ACPI_RSDT_SIG,
261 ACPI_SDTH_SIGLEN) != 0) {
262 kprintf("sdt_search_rsdt: not RSDT\n");
266 if (rsdt->rsdt_hdr.sdth_rev != 1) {
267 kprintf("sdt_search_rsdt: unsupported RSDT revision %d\n",
268 rsdt->rsdt_hdr.sdth_rev);
272 nent = (rsdt->rsdt_hdr.sdth_len - sizeof(rsdt->rsdt_hdr)) /
273 sizeof(rsdt->rsdt_ents[0]);
274 for (i = 0; i < nent; ++i) {
275 struct acpi_sdth *sdth;
277 if (rsdt->rsdt_ents[i] == 0)
280 sdth = sdt_sdth_map(rsdt->rsdt_ents[i]);
284 ret = memcmp(sdth->sdth_sig, sig, ACPI_SDTH_SIGLEN);
285 sdt_sdth_unmap(sdth);
288 sdt_paddr = rsdt->rsdt_ents[i];
294 sdt_sdth_unmap(&rsdt->rsdt_hdr);
299 sdt_search(const uint8_t *sig)
301 if (sdt_search_func == NULL)
303 return sdt_search_func(sdt_search_paddr, sig);