| 1 | /* $NetBSD: bios32.c,v 1.21 2015/11/22 13:41:24 maxv Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1999 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, |
| 9 | * NASA Ames Research Center. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer in the |
| 18 | * documentation and/or other materials provided with the distribution. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 24 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 30 | * POSSIBILITY OF SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * Copyright (c) 1999, by UCHIYAMA Yasushi |
| 35 | * All rights reserved. |
| 36 | * |
| 37 | * Redistribution and use in source and binary forms, with or without |
| 38 | * modification, are permitted provided that the following conditions |
| 39 | * are met: |
| 40 | * 1. Redistributions of source code must retain the above copyright |
| 41 | * notice, this list of conditions and the following disclaimer. |
| 42 | * 2. The name of the developer may NOT be used to endorse or promote products |
| 43 | * derived from this software without specific prior written permission. |
| 44 | * |
| 45 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 46 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 47 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 48 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 49 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 50 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 51 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 52 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 53 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 54 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 55 | * SUCH DAMAGE. |
| 56 | */ |
| 57 | |
| 58 | /* |
| 59 | * Basic interface to BIOS32 services. |
| 60 | */ |
| 61 | |
| 62 | #include <sys/cdefs.h> |
| 63 | __KERNEL_RCSID(0, "$NetBSD: bios32.c,v 1.21 2015/11/22 13:41:24 maxv Exp $" ); |
| 64 | |
| 65 | #include <sys/param.h> |
| 66 | #include <sys/systm.h> |
| 67 | #include <sys/device.h> |
| 68 | |
| 69 | #include <dev/isa/isareg.h> |
| 70 | #include <machine/isa_machdep.h> |
| 71 | |
| 72 | #include <machine/segments.h> |
| 73 | #include <machine/bios32.h> |
| 74 | #include <x86/smbiosvar.h> |
| 75 | |
| 76 | #include <uvm/uvm.h> |
| 77 | |
| 78 | #include "ipmi.h" |
| 79 | #include "opt_xen.h" |
| 80 | |
| 81 | #define BIOS32_START 0xe0000 |
| 82 | #define BIOS32_SIZE 0x20000 |
| 83 | #define BIOS32_END (BIOS32_START + BIOS32_SIZE - 0x10) |
| 84 | |
| 85 | struct bios32_entry bios32_entry; |
| 86 | struct smbios_entry smbios_entry; |
| 87 | |
| 88 | /* |
| 89 | * Initialize the BIOS32 interface. |
| 90 | */ |
| 91 | void |
| 92 | bios32_init(void) |
| 93 | { |
| 94 | #if 0 /* XXXfvdl need to set up compatibility segment for this */ |
| 95 | paddr_t entry = 0; |
| 96 | void *p; |
| 97 | unsigned char cksum; |
| 98 | int i; |
| 99 | |
| 100 | for (p = (void *)ISA_HOLE_VADDR(BIOS32_START); |
| 101 | p < (void *)ISA_HOLE_VADDR(BIOS32_END); |
| 102 | p += 16) { |
| 103 | if (*(int *)p != BIOS32_MAKESIG('_', '3', '2', '_')) |
| 104 | continue; |
| 105 | |
| 106 | cksum = 0; |
| 107 | for (i = 0; i < 16; i++) |
| 108 | cksum += *(unsigned char *)(p + i); |
| 109 | if (cksum != 0) |
| 110 | continue; |
| 111 | |
| 112 | if (*(p + 9) != 1) |
| 113 | continue; |
| 114 | |
| 115 | entry = *(uint32_t *)(p + 4); |
| 116 | |
| 117 | aprint_verbose("BIOS32 rev. %d found at 0x%lx\n" , |
| 118 | *(p + 8), entry); |
| 119 | |
| 120 | if (entry < BIOS32_START || |
| 121 | entry >= BIOS32_END) { |
| 122 | aprint_error("BIOS32 entry point outside " |
| 123 | "allowable range\n" ); |
| 124 | entry = 0; |
| 125 | } |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | if (entry != 0) { |
| 130 | bios32_entry.offset = (void *)ISA_HOLE_VADDR(entry); |
| 131 | bios32_entry.segment = GSEL(GCODE_SEL, SEL_KPL); |
| 132 | } |
| 133 | #endif |
| 134 | uint8_t *p; |
| 135 | int i; |
| 136 | |
| 137 | /* see if we have SMBIOS extentions */ |
| 138 | for (p = ISA_HOLE_VADDR(SMBIOS_START); |
| 139 | p < (uint8_t *)ISA_HOLE_VADDR(SMBIOS_END); p+= 16) { |
| 140 | struct smbhdr * sh = (struct smbhdr *)p; |
| 141 | uint8_t chksum; |
| 142 | vaddr_t eva; |
| 143 | paddr_t pa, end; |
| 144 | |
| 145 | if (sh->sig != BIOS32_MAKESIG('_', 'S', 'M', '_')) |
| 146 | continue; |
| 147 | i = sh->len; |
| 148 | for (chksum = 0; i--; ) |
| 149 | chksum += p[i]; |
| 150 | if (chksum != 0) |
| 151 | continue; |
| 152 | p += 0x10; |
| 153 | if (p[0] != '_' && p[1] != 'D' && p[2] != 'M' && |
| 154 | p[3] != 'I' && p[4] != '_') |
| 155 | continue; |
| 156 | for (chksum = 0, i = 0xf; i--; ) |
| 157 | chksum += p[i]; |
| 158 | if (chksum != 0) |
| 159 | continue; |
| 160 | |
| 161 | pa = trunc_page(sh->addr); |
| 162 | end = round_page(sh->addr + sh->size); |
| 163 | eva = uvm_km_alloc(kernel_map, end - pa, 0, UVM_KMF_VAONLY); |
| 164 | if (eva == 0) |
| 165 | break; |
| 166 | |
| 167 | smbios_entry.addr = (uint8_t *)(eva + |
| 168 | (sh->addr & PGOFSET)); |
| 169 | smbios_entry.len = sh->size; |
| 170 | smbios_entry.mjr = sh->majrev; |
| 171 | smbios_entry.min = sh->minrev; |
| 172 | smbios_entry.count = sh->count; |
| 173 | |
| 174 | for (; pa < end; pa+= NBPG, eva+= NBPG) |
| 175 | #ifdef XEN |
| 176 | pmap_kenter_ma(eva, pa, VM_PROT_READ, 0); |
| 177 | #else |
| 178 | pmap_kenter_pa(eva, pa, VM_PROT_READ, 0); |
| 179 | #endif |
| 180 | pmap_update(pmap_kernel()); |
| 181 | |
| 182 | aprint_debug("SMBIOS rev. %d.%d @ 0x%lx (%d entries)\n" , |
| 183 | sh->majrev, sh->minrev, (u_long)sh->addr, |
| 184 | sh->count); |
| 185 | |
| 186 | break; |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * Call BIOS32 to locate the specified BIOS32 service, and fill |
| 192 | * in the entry point information. |
| 193 | */ |
| 194 | int |
| 195 | bios32_service(uint32_t service, bios32_entry_t e, bios32_entry_info_t ei) |
| 196 | { |
| 197 | uint32_t eax, ebx, ecx, edx; |
| 198 | paddr_t entry; |
| 199 | |
| 200 | if (bios32_entry.offset == 0) |
| 201 | return (0); /* BIOS32 not present */ |
| 202 | |
| 203 | __asm volatile("lcall *(%%rdi)" |
| 204 | : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) |
| 205 | : "0" (service), "1" (0), "D" (&bios32_entry)); |
| 206 | |
| 207 | if ((eax & 0xff) != 0) |
| 208 | return (0); /* service not found */ |
| 209 | |
| 210 | entry = ebx + edx; |
| 211 | |
| 212 | if (entry < BIOS32_START || entry >= BIOS32_END) { |
| 213 | aprint_error( |
| 214 | "bios32: entry point for service %c%c%c%c is outside " |
| 215 | "allowable range\n" , |
| 216 | service & 0xff, |
| 217 | (service >> 8) & 0xff, |
| 218 | (service >> 16) & 0xff, |
| 219 | (service >> 24) & 0xff); |
| 220 | return (0); |
| 221 | } |
| 222 | |
| 223 | e->offset = (void *)ISA_HOLE_VADDR(entry); |
| 224 | e->segment = GSEL(GCODE_SEL, SEL_KPL); |
| 225 | |
| 226 | ei->bei_base = ebx; |
| 227 | ei->bei_size = ecx; |
| 228 | ei->bei_entry = entry; |
| 229 | |
| 230 | return (1); |
| 231 | } |
| 232 | |
| 233 | /* |
| 234 | * smbios_find_table() takes a caller supplied smbios struct type and |
| 235 | * a pointer to a handle (struct smbtable) returning one if the structure |
| 236 | * is sucessfully located and zero otherwise. Callers should take care |
| 237 | * to initilize the cookie field of the smbtable structure to zero before |
| 238 | * the first invocation of this function. |
| 239 | * Multiple tables of the same type can be located by repeadtly calling |
| 240 | * smbios_find_table with the same arguments. |
| 241 | */ |
| 242 | int |
| 243 | smbios_find_table(uint8_t type, struct smbtable *st) |
| 244 | { |
| 245 | uint8_t *va, *end; |
| 246 | struct smbtblhdr *hdr; |
| 247 | int ret = 0, tcount = 1; |
| 248 | |
| 249 | va = smbios_entry.addr; |
| 250 | end = va + smbios_entry.len; |
| 251 | |
| 252 | /* |
| 253 | * The cookie field of the smtable structure is used to locate |
| 254 | * multiple instances of a table of an arbitrary type. Following the |
| 255 | * sucessful location of a table, the type is encoded as bits 0:7 of |
| 256 | * the cookie value, the offset in terms of the number of structures |
| 257 | * preceding that referenced by the handle is encoded in bits 15:31. |
| 258 | */ |
| 259 | if ((st->cookie & 0xfff) == type && st->cookie >> 16) { |
| 260 | if ((uint8_t *)st->hdr >= va && (uint8_t *)st->hdr < end) { |
| 261 | hdr = st->hdr; |
| 262 | if (hdr->type == type) { |
| 263 | va = (uint8_t *)hdr + hdr->size; |
| 264 | for (; va + 1 < end; va++) |
| 265 | if (*va == 0 && *(va + 1) == 0) |
| 266 | break; |
| 267 | va+= 2; |
| 268 | tcount = st->cookie >> 16; |
| 269 | } |
| 270 | } |
| 271 | } |
| 272 | for (; va + sizeof(struct smbtblhdr) < end && tcount <= |
| 273 | smbios_entry.count; tcount++) { |
| 274 | hdr = (struct smbtblhdr *)va; |
| 275 | if (hdr->type == type) { |
| 276 | ret = 1; |
| 277 | st->hdr = hdr; |
| 278 | st->tblhdr = va + sizeof(struct smbtblhdr); |
| 279 | st->cookie = (tcount + 1) << 16 | type; |
| 280 | break; |
| 281 | } |
| 282 | if (hdr->type == SMBIOS_TYPE_EOT) |
| 283 | break; |
| 284 | va+= hdr->size; |
| 285 | for (; va + 1 < end; va++) |
| 286 | if (*va == 0 && *(va + 1) == 0) |
| 287 | break; |
| 288 | va+=2; |
| 289 | } |
| 290 | |
| 291 | return ret; |
| 292 | } |
| 293 | |
| 294 | char * |
| 295 | smbios_get_string(struct smbtable *st, uint8_t indx, char *dest, size_t len) |
| 296 | { |
| 297 | uint8_t *va, *end; |
| 298 | char *ret = NULL; |
| 299 | int i; |
| 300 | |
| 301 | va = (uint8_t *)st->hdr + st->hdr->size; |
| 302 | end = smbios_entry.addr + smbios_entry.len; |
| 303 | for (i = 1; va < end && i < indx && *va; i++) |
| 304 | while (*va++) |
| 305 | ; |
| 306 | if (i == indx) { |
| 307 | if (va + len < end) { |
| 308 | ret = dest; |
| 309 | memcpy(ret, va, len); |
| 310 | ret[len - 1] = '\0'; |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | return ret; |
| 315 | } |
| 316 | |