| 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> |
| 36 | #include <sys/bus.h> |
| 37 | #include <sys/kernel.h> |
| 38 | #include <sys/systm.h> |
| 39 | |
| 40 | #include <machine/pmap.h> |
| 41 | #include <machine/smp.h> |
| 42 | #include <machine/md_var.h> |
| 43 | #include <machine/specialreg.h> |
| 44 | |
| 45 | #include "acpi_sdt.h" |
| 46 | #include "acpi_sdt_var.h" |
| 47 | |
| 48 | #define SDT_VPRINTF(fmt, arg...) \ |
| 49 | do { \ |
| 50 | if (bootverbose) \ |
| 51 | kprintf("ACPI SDT: " fmt , ##arg); \ |
| 52 | } while (0) |
| 53 | |
| 54 | #define ACPI_RSDP_EBDA_MAPSZ 1024 |
| 55 | #define ACPI_RSDP_BIOS_MAPSZ 0x20000 |
| 56 | #define ACPI_RSDP_BIOS_MAPADDR 0xe0000 |
| 57 | |
| 58 | #define ACPI_RSDP_ALIGN 16 |
| 59 | |
| 60 | #define ACPI_RSDP_SIGLEN 8 |
| 61 | #define ACPI_RSDP_SIG "RSD PTR " |
| 62 | |
| 63 | /* Root System Description Pointer */ |
| 64 | struct acpi_rsdp { |
| 65 | uint8_t rsdp_sig[ACPI_RSDP_SIGLEN]; |
| 66 | uint8_t rsdp_cksum; |
| 67 | uint8_t rsdp_oem_id[6]; |
| 68 | uint8_t rsdp_rev; |
| 69 | uint32_t rsdp_rsdt; |
| 70 | uint32_t rsdp_len; |
| 71 | uint64_t rsdp_xsdt; |
| 72 | uint8_t rsdp_ext_cksum; |
| 73 | uint8_t rsdp_rsvd[3]; |
| 74 | } __packed; |
| 75 | |
| 76 | /* Extended System Description Table */ |
| 77 | struct acpi_xsdt { |
| 78 | struct acpi_sdth xsdt_hdr; |
| 79 | uint64_t xsdt_ents[1]; |
| 80 | } __packed; |
| 81 | |
| 82 | /* Root System Description Table */ |
| 83 | struct acpi_rsdt { |
| 84 | struct acpi_sdth rsdt_hdr; |
| 85 | uint32_t rsdt_ents[1]; |
| 86 | } __packed; |
| 87 | |
| 88 | typedef vm_paddr_t (*sdt_search_t)(vm_paddr_t, const uint8_t *); |
| 89 | |
| 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 *); |
| 93 | |
| 94 | extern u_long ebda_addr; |
| 95 | |
| 96 | static sdt_search_t sdt_search_func; |
| 97 | static vm_paddr_t sdt_search_paddr; |
| 98 | |
| 99 | static void |
| 100 | sdt_probe(void) |
| 101 | { |
| 102 | const struct acpi_rsdp *rsdp; |
| 103 | vm_size_t mapsz; |
| 104 | uint8_t *ptr; |
| 105 | |
| 106 | if (ebda_addr != 0) { |
| 107 | mapsz = ACPI_RSDP_EBDA_MAPSZ; |
| 108 | ptr = pmap_mapdev(ebda_addr, mapsz); |
| 109 | |
| 110 | rsdp = sdt_rsdp_search(ptr, mapsz); |
| 111 | if (rsdp == NULL) { |
| 112 | SDT_VPRINTF("RSDP not in EBDA\n"); |
| 113 | pmap_unmapdev((vm_offset_t)ptr, mapsz); |
| 114 | |
| 115 | ptr = NULL; |
| 116 | mapsz = 0; |
| 117 | } else { |
| 118 | SDT_VPRINTF("RSDP in EBDA\n"); |
| 119 | goto found_rsdp; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | mapsz = ACPI_RSDP_BIOS_MAPSZ; |
| 124 | ptr = pmap_mapdev(ACPI_RSDP_BIOS_MAPADDR, mapsz); |
| 125 | |
| 126 | rsdp = sdt_rsdp_search(ptr, mapsz); |
| 127 | if (rsdp == NULL) { |
| 128 | kprintf("sdt_probe: no RSDP\n"); |
| 129 | pmap_unmapdev((vm_offset_t)ptr, mapsz); |
| 130 | return; |
| 131 | } else { |
| 132 | SDT_VPRINTF("RSDP in BIOS mem\n"); |
| 133 | } |
| 134 | |
| 135 | found_rsdp: |
| 136 | if (rsdp->rsdp_rev != 2) { |
| 137 | sdt_search_func = sdt_search_rsdt; |
| 138 | sdt_search_paddr = rsdp->rsdp_rsdt; |
| 139 | } else { |
| 140 | sdt_search_func = sdt_search_xsdt; |
| 141 | sdt_search_paddr = rsdp->rsdp_xsdt; |
| 142 | } |
| 143 | pmap_unmapdev((vm_offset_t)ptr, mapsz); |
| 144 | } |
| 145 | SYSINIT(sdt_probe, SI_BOOT2_PRESMP, SI_ORDER_FIRST, sdt_probe, 0); |
| 146 | |
| 147 | static const struct acpi_rsdp * |
| 148 | sdt_rsdp_search(const uint8_t *target, int size) |
| 149 | { |
| 150 | const struct acpi_rsdp *rsdp; |
| 151 | int i; |
| 152 | |
| 153 | KKASSERT(size > sizeof(*rsdp)); |
| 154 | |
| 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) |
| 159 | return rsdp; |
| 160 | } |
| 161 | return NULL; |
| 162 | } |
| 163 | |
| 164 | void * |
| 165 | sdt_sdth_map(vm_paddr_t paddr) |
| 166 | { |
| 167 | struct acpi_sdth *sdth; |
| 168 | vm_size_t mapsz; |
| 169 | |
| 170 | sdth = pmap_mapdev(paddr, sizeof(*sdth)); |
| 171 | mapsz = sdth->sdth_len; |
| 172 | pmap_unmapdev((vm_offset_t)sdth, sizeof(*sdth)); |
| 173 | |
| 174 | if (mapsz < sizeof(*sdth)) |
| 175 | return NULL; |
| 176 | |
| 177 | return pmap_mapdev(paddr, mapsz); |
| 178 | } |
| 179 | |
| 180 | void |
| 181 | sdt_sdth_unmap(struct acpi_sdth *sdth) |
| 182 | { |
| 183 | pmap_unmapdev((vm_offset_t)sdth, sdth->sdth_len); |
| 184 | } |
| 185 | |
| 186 | static vm_paddr_t |
| 187 | sdt_search_xsdt(vm_paddr_t xsdt_paddr, const uint8_t *sig) |
| 188 | { |
| 189 | struct acpi_xsdt *xsdt; |
| 190 | vm_paddr_t sdt_paddr = 0; |
| 191 | int i, nent; |
| 192 | |
| 193 | if (xsdt_paddr == 0) { |
| 194 | kprintf("sdt_search_xsdt: XSDT paddr == 0\n"); |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | xsdt = sdt_sdth_map(xsdt_paddr); |
| 199 | if (xsdt == NULL) { |
| 200 | kprintf("sdt_search_xsdt: can't map XSDT\n"); |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | if (memcmp(xsdt->xsdt_hdr.sdth_sig, ACPI_XSDT_SIG, |
| 205 | ACPI_SDTH_SIGLEN) != 0) { |
| 206 | kprintf("sdt_search_xsdt: not XSDT\n"); |
| 207 | goto back; |
| 208 | } |
| 209 | |
| 210 | if (xsdt->xsdt_hdr.sdth_rev != 1) { |
| 211 | kprintf("sdt_search_xsdt: unsupported XSDT revision %d\n", |
| 212 | xsdt->xsdt_hdr.sdth_rev); |
| 213 | goto back; |
| 214 | } |
| 215 | |
| 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; |
| 220 | |
| 221 | if (xsdt->xsdt_ents[i] == 0) |
| 222 | continue; |
| 223 | |
| 224 | sdth = sdt_sdth_map(xsdt->xsdt_ents[i]); |
| 225 | if (sdth != NULL) { |
| 226 | int ret; |
| 227 | |
| 228 | ret = memcmp(sdth->sdth_sig, sig, ACPI_SDTH_SIGLEN); |
| 229 | sdt_sdth_unmap(sdth); |
| 230 | |
| 231 | if (ret == 0) { |
| 232 | sdt_paddr = xsdt->xsdt_ents[i]; |
| 233 | break; |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | back: |
| 238 | sdt_sdth_unmap(&xsdt->xsdt_hdr); |
| 239 | return sdt_paddr; |
| 240 | } |
| 241 | |
| 242 | static vm_paddr_t |
| 243 | sdt_search_rsdt(vm_paddr_t rsdt_paddr, const uint8_t *sig) |
| 244 | { |
| 245 | struct acpi_rsdt *rsdt; |
| 246 | vm_paddr_t sdt_paddr = 0; |
| 247 | int i, nent; |
| 248 | |
| 249 | if (rsdt_paddr == 0) { |
| 250 | kprintf("sdt_search_rsdt: RSDT paddr == 0\n"); |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | rsdt = sdt_sdth_map(rsdt_paddr); |
| 255 | if (rsdt == NULL) { |
| 256 | kprintf("sdt_search_rsdt: can't map RSDT\n"); |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | if (memcmp(rsdt->rsdt_hdr.sdth_sig, ACPI_RSDT_SIG, |
| 261 | ACPI_SDTH_SIGLEN) != 0) { |
| 262 | kprintf("sdt_search_rsdt: not RSDT\n"); |
| 263 | goto back; |
| 264 | } |
| 265 | |
| 266 | if (rsdt->rsdt_hdr.sdth_rev != 1) { |
| 267 | kprintf("sdt_search_rsdt: unsupported RSDT revision %d\n", |
| 268 | rsdt->rsdt_hdr.sdth_rev); |
| 269 | goto back; |
| 270 | } |
| 271 | |
| 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; |
| 276 | |
| 277 | if (rsdt->rsdt_ents[i] == 0) |
| 278 | continue; |
| 279 | |
| 280 | sdth = sdt_sdth_map(rsdt->rsdt_ents[i]); |
| 281 | if (sdth != NULL) { |
| 282 | int ret; |
| 283 | |
| 284 | ret = memcmp(sdth->sdth_sig, sig, ACPI_SDTH_SIGLEN); |
| 285 | sdt_sdth_unmap(sdth); |
| 286 | |
| 287 | if (ret == 0) { |
| 288 | sdt_paddr = rsdt->rsdt_ents[i]; |
| 289 | break; |
| 290 | } |
| 291 | } |
| 292 | } |
| 293 | back: |
| 294 | sdt_sdth_unmap(&rsdt->rsdt_hdr); |
| 295 | return sdt_paddr; |
| 296 | } |
| 297 | |
| 298 | vm_paddr_t |
| 299 | sdt_search(const uint8_t *sig) |
| 300 | { |
| 301 | if (sdt_search_func == NULL) |
| 302 | return 0; |
| 303 | return sdt_search_func(sdt_search_paddr, sig); |
| 304 | } |