1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <sys/types.h> 27 #include <sys/param.h> 28 #include <sys/controlregs.h> 29 #include <sys/bootconf.h> 30 #include <sys/bootvfs.h> 31 #include <sys/bootregs.h> 32 #include <sys/bootconf.h> 33 #include <sys/conf.h> 34 #include <sys/promif.h> 35 #include <sys/ddi.h> 36 #include <sys/sunddi.h> 37 #include <sys/sunndi.h> 38 #include <sys/biosdisk.h> 39 #include <sys/psw.h> 40 #if defined(__xpv) 41 #include <sys/hypervisor.h> 42 #endif 43 44 extern int prom_debug; 45 46 /* hard code realmode memory address for now */ 47 #define BIOS_RES_BUFFER_ADDR 0x7000 48 49 #define BIOSDEV_NUM 8 50 #define STARTING_DRVNUM 0x80 51 #define FP_OFF(fp) (((uintptr_t)(fp)) & 0xFFFF) 52 #define FP_SEG(fp) ((((uintptr_t)(fp)) >> 16) & 0xFFFF) 53 54 #ifdef DEBUG 55 int biosdebug = 0; 56 #define dprintf(fmt) \ 57 if (biosdebug) \ 58 prom_printf fmt 59 #else 60 #define dprintf(fmt) 61 #endif 62 63 biosdev_data_t biosdev_info[BIOSDEV_NUM]; /* from 0x80 to 0x87 */ 64 int dobiosdev = 1; 65 66 67 static int bios_check_extension_present(uchar_t); 68 static int get_dev_params(uchar_t); 69 static int read_firstblock(uchar_t drivenum); 70 static int drive_present(uchar_t drivenum); 71 static void reset_disk(uchar_t drivenum); 72 static int is_eltorito(uchar_t drivenum); 73 74 #if !defined(__xpv) 75 void 76 startup_bios_disk() 77 { 78 uchar_t drivenum; 79 int got_devparams = 0; 80 int got_first_block = 0; 81 uchar_t name[20]; 82 dev_info_t *devi; 83 int extensions; 84 85 if (dobiosdev == 0) 86 return; 87 88 for (drivenum = 0x80; drivenum < (0x80 + BIOSDEV_NUM); drivenum++) { 89 90 if (!drive_present(drivenum)) 91 continue; 92 93 extensions = bios_check_extension_present(drivenum); 94 95 /* 96 * If we're booting from an Eltorito CD/DVD image, there's 97 * no need to get the device parameters or read the first block 98 * because we'll never install onto this device. 99 */ 100 if (extensions && is_eltorito(drivenum)) 101 continue; 102 103 if (extensions && get_dev_params(drivenum)) 104 got_devparams = 1; 105 else 106 got_devparams = 0; 107 108 if ((got_first_block = read_firstblock(drivenum)) == 0) { 109 /* retry */ 110 got_first_block = read_firstblock(drivenum); 111 } 112 113 if (got_devparams || got_first_block) { 114 (void) sprintf((char *)name, "biosdev-0x%x", drivenum); 115 devi = ddi_root_node(); 116 (void) e_ddi_prop_update_byte_array(DDI_DEV_T_NONE, 117 devi, (char *)name, 118 (uchar_t *)&biosdev_info[drivenum - 0x80], 119 sizeof (biosdev_data_t)); 120 } 121 } 122 } 123 #endif 124 125 static int 126 bios_check_extension_present(uchar_t drivenum) 127 { 128 struct bop_regs rp = {0}; 129 extern struct bootops *bootops; 130 131 rp.eax.word.ax = 0x4100; 132 rp.ebx.word.bx = 0x55AA; 133 rp.edx.word.dx = drivenum; 134 135 /* make sure we have extension support */ 136 BOP_DOINT(bootops, 0x13, &rp); 137 138 if (((rp.eflags & PS_C) != 0) || (rp.ebx.word.bx != 0xAA55)) { 139 dprintf(("bios_check_extension_present int13 fn 41 " 140 "failed %d bx = %x\n", rp.eflags, rp.ebx.word.bx)); 141 return (0); 142 } 143 144 if ((rp.ecx.word.cx & 0x7) == 0) { 145 dprintf(("bios_check_extension_present get device parameters " 146 "not supported cx = %x\n", rp.ecx.word.cx)); 147 return (0); 148 } 149 150 return (1); 151 } 152 153 static int 154 get_dev_params(uchar_t drivenum) 155 { 156 struct bop_regs rp = {0}; 157 fn48_t *bufp; 158 extern struct bootops *bootops; 159 int i; 160 int index; 161 uchar_t *tmp; 162 163 dprintf(("In get_dev_params\n")); 164 165 bufp = (fn48_t *)BIOS_RES_BUFFER_ADDR; 166 167 /* 168 * We cannot use bzero here as we're initializing data 169 * at an address below kernel base. 170 */ 171 for (i = 0; i < sizeof (*bufp); i++) 172 ((uchar_t *)bufp)[i] = 0; 173 174 bufp->buflen = sizeof (*bufp); 175 rp.eax.word.ax = 0x4800; 176 rp.edx.byte.dl = drivenum; 177 178 rp.esi.word.si = (uint16_t)FP_OFF((uint_t)(uintptr_t)bufp); 179 rp.ds = FP_SEG((uint_t)(uintptr_t)bufp); 180 181 BOP_DOINT(bootops, 0x13, &rp); 182 183 if ((rp.eflags & PS_C) != 0) { 184 dprintf(("EDD FAILED on drive eflag = %x ah= %x\n", 185 rp.eflags, rp.eax.byte.ah)); 186 return (0); 187 } 188 189 index = drivenum - 0x80; 190 biosdev_info[index].edd_valid = 1; 191 192 /* 193 * Some compilers turn a structure copy into a call 194 * to memcpy. Since we are copying data below kernel 195 * base intentionally, and memcpy asserts that's not 196 * the case, we do the copy manually here. 197 */ 198 tmp = (uchar_t *)&biosdev_info[index].fn48_dev_params; 199 for (i = 0; i < sizeof (*bufp); i++) 200 tmp[i] = ((uchar_t *)bufp)[i]; 201 202 return (1); 203 } 204 205 static int 206 drive_present(uchar_t drivenum) 207 { 208 struct bop_regs rp = {0}; 209 210 rp.eax.byte.ah = 0x8; /* get params */ 211 rp.edx.byte.dl = drivenum; 212 213 BOP_DOINT(bootops, 0x13, &rp); 214 215 if (((rp.eflags & PS_C) != 0) || rp.eax.byte.ah != 0) { 216 dprintf(("drive not present drivenum %x eflag %x ah %x\n", 217 drivenum, rp.eflags, rp.eax.byte.ah)); 218 return (0); 219 } 220 221 dprintf(("drive-present %x\n", drivenum)); 222 return (1); 223 } 224 225 static void 226 reset_disk(uchar_t drivenum) 227 { 228 struct bop_regs rp = {0}; 229 int status; 230 231 rp.eax.byte.ah = 0x0; /* reset disk */ 232 rp.edx.byte.dl = drivenum; 233 234 BOP_DOINT(bootops, 0x13, &rp); 235 236 status = rp.eax.byte.ah; 237 238 if (((rp.eflags & PS_C) != 0) || status != 0) 239 dprintf(("Bad disk reset driv %x, status %x\n", drivenum, 240 status)); 241 } 242 243 /* Get first block */ 244 static int 245 read_firstblock(uchar_t drivenum) 246 { 247 248 struct bop_regs rp = {0}; 249 caddr_t bufp; 250 uchar_t status; 251 int i, index; 252 253 254 reset_disk(drivenum); 255 bufp = (caddr_t)BIOS_RES_BUFFER_ADDR; 256 257 258 rp.eax.byte.ah = 0x2; /* Read disk */ 259 rp.eax.byte.al = 1; /* nsect */ 260 rp.ecx.byte.ch = 0; /* cyl & 0xff */ 261 rp.ecx.byte.cl = 1; /* cyl >> 2 & 0xc0 (sector number) */ 262 rp.edx.byte.dh = 0; /* head */ 263 rp.edx.byte.dl = drivenum; /* drivenum */ 264 265 /* es:bx is buf address */ 266 rp.ebx.word.bx = (uint16_t)FP_OFF((uint_t)(uintptr_t)bufp); 267 rp.es = FP_SEG((uint_t)(uintptr_t)bufp); 268 269 BOP_DOINT(bootops, 0x13, &rp); 270 271 status = rp.eax.byte.ah; 272 if (((rp.eflags & PS_C) != 0) || status != 0) { 273 dprintf(("read_firstblock AH not clear %x \n", status)); 274 return (0); 275 } 276 277 dprintf(("drivenum %x uid at 0x1b8 is %x\n", drivenum, 278 *(uint32_t *)(bufp +0x1b8))); 279 280 index = drivenum - 0x80; 281 282 biosdev_info[index].first_block_valid = 1; 283 for (i = 0; i < 512; i++) 284 biosdev_info[index].first_block[i] = *((uchar_t *)bufp + i); 285 286 return (1); 287 } 288 289 static int 290 is_eltorito(uchar_t drivenum) 291 { 292 struct bop_regs rp = {0}; 293 fn4b_t *bufp; 294 extern struct bootops *bootops; 295 int i; 296 297 dprintf(("In is_eltorito\n")); 298 299 bufp = (fn4b_t *)BIOS_RES_BUFFER_ADDR; 300 301 /* 302 * We cannot use bzero here as we're initializing data 303 * at an address below kernel base. 304 */ 305 for (i = 0; i < sizeof (*bufp); i++) 306 ((uchar_t *)bufp)[i] = 0; 307 308 bufp->pkt_size = sizeof (*bufp); 309 rp.eax.word.ax = 0x4b01; 310 rp.edx.byte.dl = drivenum; 311 312 rp.esi.word.si = (uint16_t)FP_OFF((uint_t)(uintptr_t)bufp); 313 rp.ds = FP_SEG((uint_t)(uintptr_t)bufp); 314 315 BOP_DOINT(bootops, 0x13, &rp); 316 317 if ((rp.eflags & PS_C) != 0 || bufp->drivenum != drivenum) { 318 dprintf(("fn 0x4b01 FAILED on drive " 319 "eflags=%x ah=%x drivenum=%x\n", 320 rp.eflags, rp.eax.byte.ah, bufp->drivenum)); 321 return (0); 322 } 323 324 if (prom_debug) 325 prom_printf("INT13 FN4B01 mtype => %x", bufp->boot_mtype); 326 327 return (1); 328 } 329