usr/src/uts/i86pc/os/biosdisk.c

   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 }