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 65 66 static int bios_check_extension_present(uchar_t); 67 static int get_dev_params(uchar_t); 68 static int read_firstblock(uchar_t drivenum); 69 static int drive_present(uchar_t drivenum); 70 static void reset_disk(uchar_t drivenum); 71 static int is_eltorito(uchar_t drivenum); 72 73 #if !defined(__xpv) 74 void 75 startup_bios_disk() 76 { 77 uchar_t drivenum; 78 int got_devparams = 0; 79 int got_first_block = 0; 80 uchar_t name[20]; 81 dev_info_t *devi; 82 int extensions; 83 84 for (drivenum = 0x80; drivenum < (0x80 + BIOSDEV_NUM); drivenum++) { 85 86 if (!drive_present(drivenum)) 87 continue; 88 89 extensions = bios_check_extension_present(drivenum); 90 91 /* 92 * If we're booting from an Eltorito CD/DVD image, there's 93 * no need to get the device parameters or read the first block 94 * because we'll never install onto this device. 95 */ 96 if (extensions && is_eltorito(drivenum)) 97 continue; 98 99 if (extensions && get_dev_params(drivenum)) 100 got_devparams = 1; 101 else 102 got_devparams = 0; 103 104 if ((got_first_block = read_firstblock(drivenum)) == 0) { 105 /* retry */ 106 got_first_block = read_firstblock(drivenum); 107 } 108 109 if (got_devparams || got_first_block) { 110 (void) sprintf((char *)name, "biosdev-0x%x", drivenum); 111 devi = ddi_root_node(); 112 (void) e_ddi_prop_update_byte_array(DDI_DEV_T_NONE, 113 devi, (char *)name, 114 (uchar_t *)&biosdev_info[drivenum - 0x80], 115 sizeof (biosdev_data_t)); 116 } 117 } 118 } 119 #endif 120 121 static int 122 bios_check_extension_present(uchar_t drivenum) 123 { 124 struct bop_regs rp = {0}; 125 extern struct bootops *bootops; 126 127 rp.eax.word.ax = 0x4100; 128 rp.ebx.word.bx = 0x55AA; 129 rp.edx.word.dx = drivenum; 130 131 /* make sure we have extension support */ 132 BOP_DOINT(bootops, 0x13, &rp); 133 134 if (((rp.eflags & PS_C) != 0) || (rp.ebx.word.bx != 0xAA55)) { 135 dprintf(("bios_check_extension_present int13 fn 41 " 136 "failed %d bx = %x\n", rp.eflags, rp.ebx.word.bx)); 137 return (0); 138 } 139 140 if ((rp.ecx.word.cx & 0x7) == 0) { 141 dprintf(("bios_check_extension_present get device parameters " 142 "not supported cx = %x\n", rp.ecx.word.cx)); 143 return (0); 144 } 145 146 return (1); 147 } 148 149 static int 150 get_dev_params(uchar_t drivenum) 151 { 152 struct bop_regs rp = {0}; 153 fn48_t *bufp; 154 extern struct bootops *bootops; 155 int i; 156 int index; 157 uchar_t *tmp; 158 159 dprintf(("In get_dev_params\n")); 160 161 bufp = (fn48_t *)BIOS_RES_BUFFER_ADDR; 162 163 /* 164 * We cannot use bzero here as we're initializing data 165 * at an address below kernel base. 166 */ 167 for (i = 0; i < sizeof (*bufp); i++) 168 ((uchar_t *)bufp)[i] = 0; 169 170 bufp->buflen = sizeof (*bufp); 171 rp.eax.word.ax = 0x4800; 172 rp.edx.byte.dl = drivenum; 173 174 rp.esi.word.si = (uint16_t)FP_OFF((uint_t)(uintptr_t)bufp); 175 rp.ds = FP_SEG((uint_t)(uintptr_t)bufp); 176 177 BOP_DOINT(bootops, 0x13, &rp); 178 179 if ((rp.eflags & PS_C) != 0) { 180 dprintf(("EDD FAILED on drive eflag = %x ah= %x\n", 181 rp.eflags, rp.eax.byte.ah)); 182 return (0); 183 } 184 185 index = drivenum - 0x80; 186 biosdev_info[index].edd_valid = 1; 187 188 /* 189 * Some compilers turn a structure copy into a call 190 * to memcpy. Since we are copying data below kernel 191 * base intentionally, and memcpy asserts that's not 192 * the case, we do the copy manually here. 193 */ 194 tmp = (uchar_t *)&biosdev_info[index].fn48_dev_params; 195 for (i = 0; i < sizeof (*bufp); i++) 196 tmp[i] = ((uchar_t *)bufp)[i]; 197 198 return (1); 199 } 200 201 static int 202 drive_present(uchar_t drivenum) 203 { 204 struct bop_regs rp = {0}; 205 206 rp.eax.byte.ah = 0x8; /* get params */ 207 rp.edx.byte.dl = drivenum; 208 209 BOP_DOINT(bootops, 0x13, &rp); 210 211 if (((rp.eflags & PS_C) != 0) || rp.eax.byte.ah != 0) { 212 dprintf(("drive not present drivenum %x eflag %x ah %x\n", 213 drivenum, rp.eflags, rp.eax.byte.ah)); 214 return (0); 215 } 216 217 dprintf(("drive-present %x\n", drivenum)); 218 return (1); 219 } 220 221 static void 222 reset_disk(uchar_t drivenum) 223 { 224 struct bop_regs rp = {0}; 225 int status; 226 227 rp.eax.byte.ah = 0x0; /* reset disk */ 228 rp.edx.byte.dl = drivenum; 229 230 BOP_DOINT(bootops, 0x13, &rp); 231 232 status = rp.eax.byte.ah; 233 234 if (((rp.eflags & PS_C) != 0) || status != 0) 235 dprintf(("Bad disk reset driv %x, status %x\n", drivenum, 236 status)); 237 } 238 239 /* Get first block */ 240 static int 241 read_firstblock(uchar_t drivenum) 242 { 243 244 struct bop_regs rp = {0}; 245 caddr_t bufp; 246 uchar_t status; 247 int i, index; 248 249 250 reset_disk(drivenum); 251 bufp = (caddr_t)BIOS_RES_BUFFER_ADDR; 252 253 254 rp.eax.byte.ah = 0x2; /* Read disk */ 255 rp.eax.byte.al = 1; /* nsect */ 256 rp.ecx.byte.ch = 0; /* cyl & 0xff */ 257 rp.ecx.byte.cl = 1; /* cyl >> 2 & 0xc0 (sector number) */ 258 rp.edx.byte.dh = 0; /* head */ 259 rp.edx.byte.dl = drivenum; /* drivenum */ 260 261 /* es:bx is buf address */ 262 rp.ebx.word.bx = (uint16_t)FP_OFF((uint_t)(uintptr_t)bufp); 263 rp.es = FP_SEG((uint_t)(uintptr_t)bufp); 264 265 BOP_DOINT(bootops, 0x13, &rp); 266 267 status = rp.eax.byte.ah; 268 if (((rp.eflags & PS_C) != 0) || status != 0) { 269 dprintf(("read_firstblock AH not clear %x \n", status)); 270 return (0); 271 } 272 273 dprintf(("drivenum %x uid at 0x1b8 is %x\n", drivenum, 274 *(uint32_t *)(bufp +0x1b8))); 275 276 index = drivenum - 0x80; 277 278 biosdev_info[index].first_block_valid = 1; 279 for (i = 0; i < 512; i++) 280 biosdev_info[index].first_block[i] = *((uchar_t *)bufp + i); 281 282 return (1); 283 } 284 285 static int 286 is_eltorito(uchar_t drivenum) 287 { 288 struct bop_regs rp = {0}; 289 fn4b_t *bufp; 290 extern struct bootops *bootops; 291 int i; 292 293 dprintf(("In is_eltorito\n")); 294 295 bufp = (fn4b_t *)BIOS_RES_BUFFER_ADDR; 296 297 /* 298 * We cannot use bzero here as we're initializing data 299 * at an address below kernel base. 300 */ 301 for (i = 0; i < sizeof (*bufp); i++) 302 ((uchar_t *)bufp)[i] = 0; 303 304 bufp->pkt_size = sizeof (*bufp); 305 rp.eax.word.ax = 0x4b01; 306 rp.edx.byte.dl = drivenum; 307 308 rp.esi.word.si = (uint16_t)FP_OFF((uint_t)(uintptr_t)bufp); 309 rp.ds = FP_SEG((uint_t)(uintptr_t)bufp); 310 311 BOP_DOINT(bootops, 0x13, &rp); 312 313 if ((rp.eflags & PS_C) != 0 || bufp->drivenum != drivenum) { 314 dprintf(("fn 0x4b01 FAILED on drive " 315 "eflags=%x ah=%x drivenum=%x\n", 316 rp.eflags, rp.eax.byte.ah, bufp->drivenum)); 317 return (0); 318 } 319 320 if (prom_debug) 321 prom_printf("INT13 FN4B01 mtype => %x", bufp->boot_mtype); 322 323 return (1); 324 } 325