biosdisk.c revision 332154
143561Skato/*- 243561Skato * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 343561Skato * All rights reserved. 443561Skato * 543561Skato * Redistribution and use in source and binary forms, with or without 643561Skato * modification, are permitted provided that the following conditions 743561Skato * are met: 843561Skato * 1. Redistributions of source code must retain the above copyright 943561Skato * notice, this list of conditions and the following disclaimer. 1043561Skato * 2. Redistributions in binary form must reproduce the above copyright 1143561Skato * notice, this list of conditions and the following disclaimer in the 1243561Skato * documentation and/or other materials provided with the distribution. 1343561Skato * 1443561Skato * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1543561Skato * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1643561Skato * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1743561Skato * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1843561Skato * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1943561Skato * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2043561Skato * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2143561Skato * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2243561Skato * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2343561Skato * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2443561Skato * SUCH DAMAGE. 2543561Skato */ 2643561Skato 27119880Sobrien#include <sys/cdefs.h> 28119880Sobrien__FBSDID("$FreeBSD: stable/11/stand/pc98/libpc98/biosdisk.c 332154 2018-04-06 21:37:25Z kevans $"); 29119880Sobrien 3043561Skato/* 3143561Skato * BIOS disk device handling. 3243561Skato * 3343561Skato * Ideas and algorithms from: 3443561Skato * 3543561Skato * - NetBSD libi386/biosdisk.c 3643561Skato * - FreeBSD biosboot/disk.c 3743561Skato * 3843561Skato */ 3943561Skato 4043561Skato#include <stand.h> 4143561Skato 4243561Skato#include <sys/disklabel.h> 43104621Snyan#include <sys/diskpc98.h> 44113083Sphk#include <machine/bootinfo.h> 4543561Skato 4643561Skato#include <stdarg.h> 4743561Skato 4843561Skato#include <bootstrap.h> 4943561Skato#include <btxv86.h> 5043561Skato#include "libi386.h" 5143561Skato 5263101Snyan#define BIOS_NUMDRIVES 0x475 5343561Skato#define BIOSDISK_SECSIZE 512 5443561Skato#define BUFSIZE (1 * BIOSDISK_SECSIZE) 5543561Skato 5643561Skato#define DT_ATAPI 0x10 /* disk type for ATAPI floppies */ 5743561Skato#define WDMAJOR 0 /* major numbers for devices we frontend for */ 5843561Skato#define WFDMAJOR 1 5943561Skato#define FDMAJOR 2 6043561Skato#define DAMAJOR 4 6143561Skato 6243561Skato#ifdef DISK_DEBUG 6387599Sobrien# define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args) 6443561Skato#else 6543561Skato# define DEBUG(fmt, args...) 6643561Skato#endif 6743561Skato 6843561Skatostruct open_disk { 6943561Skato int od_dkunit; /* disk unit number */ 7043561Skato int od_unit; /* BIOS unit number */ 7143561Skato int od_cyl; /* BIOS geometry */ 7243561Skato int od_hds; 7343561Skato int od_sec; 7443561Skato int od_boff; /* block offset from beginning of BIOS disk */ 7543561Skato int od_flags; 7659777Snyan#define BD_MODEINT13 0x0000 7759777Snyan#define BD_MODEEDD1 0x0001 7859777Snyan#define BD_MODEEDD3 0x0002 7963101Snyan#define BD_MODEMASK 0x0003 8059777Snyan#define BD_FLOPPY 0x0004 8159777Snyan#define BD_LABELOK 0x0008 8259777Snyan#define BD_PARTTABOK 0x0010 83108791Snyan#define BD_OPTICAL 0x0020 8443561Skato struct disklabel od_disklabel; 8559777Snyan int od_nslices; /* slice count */ 86254015Smarcel struct pc98_partition od_slicetab[PC98_NPARTS]; 8743561Skato}; 8843561Skato 8943561Skato/* 9043561Skato * List of BIOS devices, translation from disk unit number to 9143561Skato * BIOS unit number. 9243561Skato */ 9343561Skatostatic struct bdinfo 9443561Skato{ 9543561Skato int bd_unit; /* BIOS unit number */ 9643561Skato int bd_flags; 9743561Skato int bd_type; /* BIOS 'drive type' (floppy only) */ 9853207Snyan int bd_da_unit; /* kernel unit number for da */ 99298230Sallanjude int bd_open; /* reference counter */ 100298230Sallanjude void *bd_bcache; /* buffer cache data */ 10143561Skato} bdinfo [MAXBDDEV]; 10243561Skatostatic int nbdinfo = 0; 10343561Skato 104332154Skevans#define BD(dev) (bdinfo[(dev)->dd.d_unit]) 105298230Sallanjude 10643561Skatostatic int bd_getgeom(struct open_disk *od); 10759777Snyanstatic int bd_read(struct open_disk *od, daddr_t dblk, int blks, 10859777Snyan caddr_t dest); 10987734Snyanstatic int bd_write(struct open_disk *od, daddr_t dblk, int blks, 11087734Snyan caddr_t dest); 11143561Skato 11243561Skatostatic int bd_int13probe(struct bdinfo *bd); 11343561Skato 114300117Simpstatic int bd_printslice(struct open_disk *od, struct pc98_partition *dp, 11568358Snyan char *prefix, int verbose); 116300117Simpstatic int bd_printbsdslice(struct open_disk *od, daddr_t offset, 11768358Snyan char *prefix, int verbose); 11843561Skato 11943561Skatostatic int bd_init(void); 12059777Snyanstatic int bd_strategy(void *devdata, int flag, daddr_t dblk, 121313355Stsoome size_t size, char *buf, size_t *rsize); 12259777Snyanstatic int bd_realstrategy(void *devdata, int flag, daddr_t dblk, 123313355Stsoome size_t size, char *buf, size_t *rsize); 12443561Skatostatic int bd_open(struct open_file *f, ...); 12543561Skatostatic int bd_close(struct open_file *f); 126328889Skevansstatic int bd_print(int verbose); 12743561Skato 12843561Skatostruct devsw biosdisk = { 12943561Skato "disk", 13043561Skato DEVT_DISK, 13143561Skato bd_init, 13243561Skato bd_strategy, 13343561Skato bd_open, 13443561Skato bd_close, 13543561Skato noioctl, 13668358Snyan bd_print, 13768358Snyan NULL 13843561Skato}; 13943561Skato 14043561Skatostatic int bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev); 14143561Skatostatic void bd_closedisk(struct open_disk *od); 142172968Snyanstatic int bd_open_pc98(struct open_disk *od, struct i386_devdesc *dev); 14359777Snyanstatic int bd_bestslice(struct open_disk *od); 14459777Snyanstatic void bd_checkextended(struct open_disk *od, int slicenum); 14543561Skato 14643561Skato/* 14743561Skato * Translate between BIOS device numbers and our private unit numbers. 14843561Skato */ 14943561Skatoint 15043561Skatobd_bios2unit(int biosdev) 15143561Skato{ 15243561Skato int i; 15343561Skato 15443561Skato DEBUG("looking for bios device 0x%x", biosdev); 15543561Skato for (i = 0; i < nbdinfo; i++) { 15643561Skato DEBUG("bd unit %d is BIOS device 0x%x", i, bdinfo[i].bd_unit); 15743561Skato if (bdinfo[i].bd_unit == biosdev) 15843561Skato return(i); 15943561Skato } 16043561Skato return(-1); 16143561Skato} 16243561Skato 16343561Skatoint 16443561Skatobd_unit2bios(int unit) 16543561Skato{ 16643561Skato if ((unit >= 0) && (unit < nbdinfo)) 16743561Skato return(bdinfo[unit].bd_unit); 16843561Skato return(-1); 16943561Skato} 17043561Skato 17143561Skato/* 17243561Skato * Quiz the BIOS for disk devices, save a little info about them. 17343561Skato */ 17443561Skatostatic int 17543561Skatobd_init(void) 17643561Skato{ 17743561Skato int base, unit; 17863101Snyan int da_drive=0, n=-0x10; 17943561Skato 18043561Skato /* sequence 0x90, 0x80, 0xa0 */ 18143561Skato for (base = 0x90; base <= 0xa0; base += n, n += 0x30) { 18243561Skato for (unit = base; (nbdinfo < MAXBDDEV) || ((unit & 0x0f) < 4); unit++) { 183298230Sallanjude bdinfo[nbdinfo].bd_open = 0; 184298230Sallanjude bdinfo[nbdinfo].bd_bcache = NULL; 18543561Skato bdinfo[nbdinfo].bd_unit = unit; 18643561Skato bdinfo[nbdinfo].bd_flags = (unit & 0xf0) == 0x90 ? BD_FLOPPY : 0; 18743561Skato 18844463Skato if (!bd_int13probe(&bdinfo[nbdinfo])){ 18949425Skato if (((unit & 0xf0) == 0x90 && (unit & 0x0f) < 4) || 19049425Skato ((unit & 0xf0) == 0xa0 && (unit & 0x0f) < 6)) 19144463Skato continue; /* Target IDs are not contiguous. */ 19244463Skato else 19344463Skato break; 19444463Skato } 19543561Skato 19643561Skato if (bdinfo[nbdinfo].bd_flags & BD_FLOPPY){ 19744467Skato /* available 1.44MB access? */ 19859777Snyan if (*(u_char *)PTOV(0xA15AE) & (1<<(unit & 0xf))) { 19944467Skato /* boot media 1.2MB FD? */ 20044467Skato if ((*(u_char *)PTOV(0xA1584) & 0xf0) != 0x90) 20144467Skato bdinfo[nbdinfo].bd_unit = 0x30 + (unit & 0xf); 20244467Skato } 20343561Skato } 20449426Skato else { 205108791Snyan if ((unit & 0xF0) == 0xA0) /* SCSI HD or MO */ 20649426Skato bdinfo[nbdinfo].bd_da_unit = da_drive++; 20749426Skato } 20843561Skato /* XXX we need "disk aliases" to make this simpler */ 20943561Skato printf("BIOS drive %c: is disk%d\n", 21049426Skato 'A' + nbdinfo, nbdinfo); 21143561Skato nbdinfo++; 21243561Skato } 21343561Skato } 214298230Sallanjude bcache_add_dev(nbdinfo); 21543561Skato return(0); 21643561Skato} 21743561Skato 21843561Skato/* 21943561Skato * Try to detect a device supported by the legacy int13 BIOS 22043561Skato */ 22143561Skatostatic int 22243561Skatobd_int13probe(struct bdinfo *bd) 22343561Skato{ 22443561Skato int addr; 22563101Snyan 22659777Snyan if (bd->bd_flags & BD_FLOPPY) { 22743561Skato addr = 0xa155c; 22859777Snyan } else { 22943561Skato if ((bd->bd_unit & 0xf0) == 0x80) 23043561Skato addr = 0xa155d; 23143561Skato else 23243561Skato addr = 0xa1482; 23343561Skato } 23443561Skato if ( *(u_char *)PTOV(addr) & (1<<(bd->bd_unit & 0x0f))) { 23543561Skato bd->bd_flags |= BD_MODEINT13; 23643561Skato return(1); 23743561Skato } 238108791Snyan if ((bd->bd_unit & 0xF0) == 0xA0) { 239108791Snyan int media = ((unsigned *)PTOV(0xA1460))[bd->bd_unit & 0x0F] & 0x1F; 240108791Snyan 241108791Snyan if (media == 7) { /* MO */ 242108791Snyan bd->bd_flags |= BD_MODEINT13 | BD_OPTICAL; 243108791Snyan return(1); 244108791Snyan } 245108791Snyan } 24643561Skato return(0); 24743561Skato} 24843561Skato 24943561Skato/* 25043561Skato * Print information about disks 25143561Skato */ 252328889Skevansstatic int 25343561Skatobd_print(int verbose) 25443561Skato{ 255328889Skevans int i, j, ret = 0; 25643561Skato char line[80]; 25743561Skato struct i386_devdesc dev; 25843561Skato struct open_disk *od; 259108650Snyan struct pc98_partition *dptr; 26043561Skato 261328889Skevans if (nbdinfo == 0) 262328889Skevans return (0); 26343561Skato 264328889Skevans printf("%s devices:", biosdisk.dv_name); 265328889Skevans if ((ret = pager_output("\n")) != 0) 266328889Skevans return (ret); 267328889Skevans 268328889Skevans for (i = 0; i < nbdinfo; i++) { 269328889Skevans snprintf(line, sizeof(line), " disk%d: BIOS drive %c:\n", 270328889Skevans i, 'A' + i); 271328889Skevans if ((ret = pager_output(line)) != 0) 272328889Skevans break; 273328889Skevans 27443561Skato /* try to open the whole disk */ 275332154Skevans dev.dd.d_unit = i; 27643561Skato dev.d_kind.biosdisk.slice = -1; 27743561Skato dev.d_kind.biosdisk.partition = -1; 27843561Skato 27943561Skato if (!bd_opendisk(&od, &dev)) { 28043561Skato 28143561Skato /* Do we have a partition table? */ 28243561Skato if (od->od_flags & BD_PARTTABOK) { 28359777Snyan dptr = &od->od_slicetab[0]; 28443561Skato 28568358Snyan /* Check for a "dedicated" disk */ 28659777Snyan for (j = 0; j < od->od_nslices; j++) { 287328889Skevans snprintf(line, sizeof(line), " disk%ds%d", i, j + 1); 288328889Skevans if ((ret = bd_printslice(od, &dptr[j], line, verbose)) != 0) 289328889Skevans break; 29043561Skato } 29143561Skato } 29243561Skato bd_closedisk(od); 293328889Skevans if (ret != 0) 294328889Skevans break; 29543561Skato } 29643561Skato } 297328889Skevans return (ret); 29843561Skato} 29943561Skato 300176654Snyan/* Given a size in 512 byte sectors, convert it to a human-readable number. */ 301176654Snyanstatic char * 302176654Snyandisplay_size(uint64_t size) 303176654Snyan{ 304176654Snyan static char buf[80]; 305176654Snyan char unit; 306176654Snyan 307176654Snyan size /= 2; 308176654Snyan unit = 'K'; 309176654Snyan if (size >= 10485760000LL) { 310176654Snyan size /= 1073741824; 311176654Snyan unit = 'T'; 312176654Snyan } else if (size >= 10240000) { 313176654Snyan size /= 1048576; 314176654Snyan unit = 'G'; 315176654Snyan } else if (size >= 10000) { 316176654Snyan size /= 1024; 317176654Snyan unit = 'M'; 318176654Snyan } 319250333Sjhb sprintf(buf, "%6ld%cB", (long)size, unit); 320176654Snyan return (buf); 321176654Snyan} 322176654Snyan 32359777Snyan/* 324190127Snyan * Print information about slices on a disk. For the size calculations we 325190127Snyan * assume a 512 byte sector. 326190127Snyan */ 327300117Simpstatic int 328190127Snyanbd_printslice(struct open_disk *od, struct pc98_partition *dp, char *prefix, 329190127Snyan int verbose) 330190127Snyan{ 331190127Snyan int cylsecs, start, size; 332190127Snyan char stats[80]; 333190127Snyan char line[80]; 334190127Snyan 335190127Snyan cylsecs = od->od_hds * od->od_sec; 336190127Snyan start = dp->dp_scyl * cylsecs + dp->dp_shd * od->od_sec + dp->dp_ssect; 337190127Snyan size = (dp->dp_ecyl - dp->dp_scyl + 1) * cylsecs; 338190127Snyan 339190127Snyan if (verbose) 340190127Snyan sprintf(stats, " %s (%d - %d)", display_size(size), 341190127Snyan start, start + size); 342190127Snyan else 343190127Snyan stats[0] = '\0'; 344190127Snyan 345190127Snyan switch(dp->dp_mid & PC98_MID_MASK) { 346190127Snyan case PC98_MID_386BSD: 347300117Simp return (bd_printbsdslice(od, start, prefix, verbose)); 348190127Snyan case 0x00: /* unused partition */ 349300117Simp return (0); 350190127Snyan case 0x01: 351190127Snyan sprintf(line, "%s: FAT-12%s\n", prefix, stats); 352190127Snyan break; 353190127Snyan case 0x11: 354190127Snyan case 0x20: 355190127Snyan case 0x21: 356190127Snyan case 0x22: 357190127Snyan case 0x23: 358190127Snyan case 0x24: 359190127Snyan sprintf(line, "%s: FAT-16%s\n", prefix, stats); 360190127Snyan break; 361190127Snyan default: 362190127Snyan sprintf(line, "%s: Unknown fs: 0x%x %s\n", prefix, dp->dp_mid, 363190127Snyan stats); 364190127Snyan } 365300117Simp return (pager_output(line)); 366190127Snyan} 367190127Snyan 368190127Snyan/* 36968358Snyan * Print out each valid partition in the disklabel of a FreeBSD slice. 37068358Snyan * For size calculations, we assume a 512 byte sector size. 37168358Snyan */ 372300117Simpstatic int 37368358Snyanbd_printbsdslice(struct open_disk *od, daddr_t offset, char *prefix, 37468358Snyan int verbose) 37559777Snyan{ 37643561Skato char line[80]; 37768358Snyan char buf[BIOSDISK_SECSIZE]; 37843561Skato struct disklabel *lp; 37943561Skato int i; 38043561Skato 38143561Skato /* read disklabel */ 38243561Skato if (bd_read(od, offset + LABELSECTOR, 1, buf)) 383300117Simp return (0); 38443561Skato lp =(struct disklabel *)(&buf[0]); 38543561Skato if (lp->d_magic != DISKMAGIC) { 38663101Snyan sprintf(line, "%s: FFS bad disklabel\n", prefix); 387300117Simp return (pager_output(line)); 38843561Skato } 38943561Skato 39043561Skato /* Print partitions */ 39143561Skato for (i = 0; i < lp->d_npartitions; i++) { 39268358Snyan /* 39368358Snyan * For each partition, make sure we know what type of fs it is. If 39468358Snyan * not, then skip it. However, since floppies often have bogus 39568358Snyan * fstypes, print the 'a' partition on a floppy even if it is marked 39668358Snyan * unused. 39768358Snyan */ 39863101Snyan if ((lp->d_partitions[i].p_fstype == FS_BSDFFS) || 39963101Snyan (lp->d_partitions[i].p_fstype == FS_SWAP) || 40063101Snyan (lp->d_partitions[i].p_fstype == FS_VINUM) || 40143561Skato ((lp->d_partitions[i].p_fstype == FS_UNUSED) && 40268358Snyan (od->od_flags & BD_FLOPPY) && (i == 0))) { 40368358Snyan 40468358Snyan /* Only print out statistics in verbose mode */ 40568358Snyan if (verbose) 406190127Snyan sprintf(line, " %s%c: %s %s (%d - %d)\n", prefix, 'a' + i, 407176654Snyan (lp->d_partitions[i].p_fstype == FS_SWAP) ? "swap " : 40868358Snyan (lp->d_partitions[i].p_fstype == FS_VINUM) ? "vinum" : 409176654Snyan "FFS ", 410176654Snyan display_size(lp->d_partitions[i].p_size), 41168358Snyan lp->d_partitions[i].p_offset, 41268358Snyan lp->d_partitions[i].p_offset + lp->d_partitions[i].p_size); 41368358Snyan else 41468358Snyan sprintf(line, " %s%c: %s\n", prefix, 'a' + i, 41568358Snyan (lp->d_partitions[i].p_fstype == FS_SWAP) ? "swap" : 41668358Snyan (lp->d_partitions[i].p_fstype == FS_VINUM) ? "vinum" : 41768358Snyan "FFS"); 418300117Simp if (pager_output(line)) 419300117Simp return (1); 42043561Skato } 42143561Skato } 422300117Simp return (0); 42343561Skato} 42443561Skato 42543561Skato 42643561Skato/* 42743561Skato * Attempt to open the disk described by (dev) for use by (f). 42843561Skato * 42943561Skato * Note that the philosophy here is "give them exactly what 43043561Skato * they ask for". This is necessary because being too "smart" 43143561Skato * about what the user might want leads to complications. 43243561Skato * (eg. given no slice or partition value, with a disk that is 43343561Skato * sliced - are they after the first BSD slice, or the DOS 43443561Skato * slice before it?) 43543561Skato */ 43643561Skatostatic int 43743561Skatobd_open(struct open_file *f, ...) 43843561Skato{ 43943561Skato va_list ap; 44043561Skato struct i386_devdesc *dev; 44143561Skato struct open_disk *od; 44243561Skato int error; 44343561Skato 44443561Skato va_start(ap, f); 44543561Skato dev = va_arg(ap, struct i386_devdesc *); 44643561Skato va_end(ap); 44743561Skato if ((error = bd_opendisk(&od, dev))) 44843561Skato return(error); 44943561Skato 450298230Sallanjude BD(dev).bd_open++; 451298230Sallanjude if (BD(dev).bd_bcache == NULL) 452298230Sallanjude BD(dev).bd_bcache = bcache_allocate(); 453298230Sallanjude 45443561Skato /* 45543561Skato * Save our context 45643561Skato */ 45743561Skato ((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od; 45843561Skato DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff); 45943561Skato return(0); 46043561Skato} 46143561Skato 46243561Skatostatic int 46343561Skatobd_opendisk(struct open_disk **odp, struct i386_devdesc *dev) 46443561Skato{ 46543561Skato struct open_disk *od; 46643561Skato int error; 46743561Skato 468332154Skevans if (dev->dd.d_unit >= nbdinfo) { 46943561Skato DEBUG("attempt to open nonexistent disk"); 47043561Skato return(ENXIO); 47143561Skato } 47243561Skato 47343561Skato od = (struct open_disk *)malloc(sizeof(struct open_disk)); 47443561Skato if (!od) { 47543561Skato DEBUG("no memory"); 47643561Skato return (ENOMEM); 47743561Skato } 47843561Skato 47943561Skato /* Look up BIOS unit number, intialise open_disk structure */ 480332154Skevans od->od_dkunit = dev->dd.d_unit; 48143561Skato od->od_unit = bdinfo[od->od_dkunit].bd_unit; 48243561Skato od->od_flags = bdinfo[od->od_dkunit].bd_flags; 48343561Skato od->od_boff = 0; 48443561Skato error = 0; 485172968Snyan DEBUG("open '%s', unit 0x%x slice %d partition %d", 486332154Skevans i386_fmtdev(dev), dev->dd.d_unit, 487172968Snyan dev->d_kind.biosdisk.slice, dev->d_kind.biosdisk.partition); 48843561Skato 48943561Skato /* Get geometry for this open (removable device may have changed) */ 49043561Skato if (bd_getgeom(od)) { 49143561Skato DEBUG("can't get geometry"); 49243561Skato error = ENXIO; 49343561Skato goto out; 49443561Skato } 49543561Skato 496172968Snyan /* Determine disk layout. */ 497172968Snyan error = bd_open_pc98(od, dev); 498172968Snyan 499172968Snyan out: 500172968Snyan if (error) { 501172968Snyan free(od); 502172968Snyan } else { 503172968Snyan *odp = od; /* return the open disk */ 504172968Snyan } 505172968Snyan return(error); 506172968Snyan} 507172968Snyan 508172968Snyanstatic int 509172968Snyanbd_open_pc98(struct open_disk *od, struct i386_devdesc *dev) 510172968Snyan{ 511172968Snyan struct pc98_partition *dptr; 512172968Snyan struct disklabel *lp; 513172968Snyan int sector, slice, i; 514172968Snyan char buf[BUFSIZE]; 515172968Snyan 51643561Skato /* 51743561Skato * Following calculations attempt to determine the correct value 51843561Skato * for d->od_boff by looking for the slice and partition specified, 51943561Skato * or searching for reasonable defaults. 52043561Skato */ 52143561Skato 52243561Skato /* 52343561Skato * Find the slice in the DOS slice table. 52443561Skato */ 525172968Snyan od->od_nslices = 0; 52643561Skato if (od->od_flags & BD_FLOPPY) { 52743561Skato sector = 0; 52843561Skato goto unsliced; 52943561Skato } 53043561Skato if (bd_read(od, 0, 1, buf)) { 53143561Skato DEBUG("error reading MBR"); 532172968Snyan return (EIO); 53343561Skato } 53443561Skato 53543561Skato /* 53643561Skato * Check the slice table magic. 53743561Skato */ 53868358Snyan if (((u_char)buf[0x1fe] != 0x55) || ((u_char)buf[0x1ff] != 0xaa)) { 53943561Skato /* If a slice number was explicitly supplied, this is an error */ 54043561Skato if (dev->d_kind.biosdisk.slice > 0) { 54143561Skato DEBUG("no slice table/MBR (no magic)"); 542172968Snyan return (ENOENT); 54343561Skato } 54443561Skato sector = 0; 54543561Skato goto unsliced; /* may be a floppy */ 54643561Skato } 54743561Skato if (bd_read(od, 1, 1, buf)) { 54843561Skato DEBUG("error reading MBR"); 549172968Snyan return (EIO); 55043561Skato } 55159777Snyan 55259777Snyan /* 55359777Snyan * copy the partition table, then pick up any extended partitions. 55459777Snyan */ 555254015Smarcel bcopy(buf + PC98_PARTOFF, &od->od_slicetab, 556254015Smarcel sizeof(struct pc98_partition) * PC98_NPARTS); 557254015Smarcel od->od_nslices = PC98_NPARTS; /* extended slices start here */ 55843561Skato od->od_flags |= BD_PARTTABOK; 55959777Snyan dptr = &od->od_slicetab[0]; 56043561Skato 56143561Skato /* Is this a request for the whole disk? */ 56243561Skato if (dev->d_kind.biosdisk.slice == -1) { 56343561Skato sector = 0; 56443561Skato goto unsliced; 56543561Skato } 56643561Skato 56759777Snyan /* 56859777Snyan * if a slice number was supplied but not found, this is an error. 56959777Snyan */ 57059777Snyan if (dev->d_kind.biosdisk.slice > 0) { 57159777Snyan slice = dev->d_kind.biosdisk.slice - 1; 57259777Snyan if (slice >= od->od_nslices) { 57359777Snyan DEBUG("slice %d not found", slice); 574172968Snyan return (ENOENT); 57559777Snyan } 57659777Snyan } 57743561Skato 57859777Snyan /* Try to auto-detect the best slice; this should always give a slice number */ 57959777Snyan if (dev->d_kind.biosdisk.slice == 0) { 58059777Snyan slice = bd_bestslice(od); 58159777Snyan if (slice == -1) { 582172968Snyan return (ENOENT); 58359777Snyan } 58459777Snyan dev->d_kind.biosdisk.slice = slice; 58559777Snyan } 58659777Snyan 58759777Snyan dptr = &od->od_slicetab[0]; 58843561Skato /* 58943561Skato * Accept the supplied slice number unequivocally (we may be looking 59043561Skato * at a DOS partition). 59143561Skato */ 59243561Skato dptr += (dev->d_kind.biosdisk.slice - 1); /* we number 1-4, offsets are 0-3 */ 59359777Snyan sector = dptr->dp_scyl * od->od_hds * od->od_sec + 59459777Snyan dptr->dp_shd * od->od_sec + dptr->dp_ssect; 59543561Skato { 59659777Snyan int end = dptr->dp_ecyl * od->od_hds * od->od_sec + 59759777Snyan dptr->dp_ehd * od->od_sec + dptr->dp_esect; 59859777Snyan DEBUG("slice entry %d at %d, %d sectors", 59959777Snyan dev->d_kind.biosdisk.slice - 1, sector, end-sector); 60043561Skato } 60143561Skato 60243561Skato /* 60343561Skato * If we are looking at a BSD slice, and the partition is < 0, assume the 'a' partition 60443561Skato */ 60543561Skato if ((dptr->dp_mid == DOSMID_386BSD) && (dev->d_kind.biosdisk.partition < 0)) 60643561Skato dev->d_kind.biosdisk.partition = 0; 60743561Skato 60843561Skato unsliced: 60943561Skato /* 61043561Skato * Now we have the slice offset, look for the partition in the disklabel if we have 61143561Skato * a partition to start with. 61243561Skato * 61343561Skato * XXX we might want to check the label checksum. 61443561Skato */ 61543561Skato if (dev->d_kind.biosdisk.partition < 0) { 61643561Skato od->od_boff = sector; /* no partition, must be after the slice */ 61743561Skato DEBUG("opening raw slice"); 61843561Skato } else { 61953207Snyan 62043561Skato if (bd_read(od, sector + LABELSECTOR, 1, buf)) { 62143561Skato DEBUG("error reading disklabel"); 622172968Snyan return (EIO); 62343561Skato } 62443561Skato DEBUG("copy %d bytes of label from %p to %p", sizeof(struct disklabel), buf + LABELOFFSET, &od->od_disklabel); 62543561Skato bcopy(buf + LABELOFFSET, &od->od_disklabel, sizeof(struct disklabel)); 62643561Skato lp = &od->od_disklabel; 62743561Skato od->od_flags |= BD_LABELOK; 62843561Skato 62943561Skato if (lp->d_magic != DISKMAGIC) { 63043561Skato DEBUG("no disklabel"); 631172968Snyan return (ENOENT); 63243561Skato } 63343561Skato if (dev->d_kind.biosdisk.partition >= lp->d_npartitions) { 63443561Skato DEBUG("partition '%c' exceeds partitions in table (a-'%c')", 63543561Skato 'a' + dev->d_kind.biosdisk.partition, 'a' + lp->d_npartitions); 636172968Snyan return (EPART); 63743561Skato } 63843561Skato 63968358Snyan#ifdef DISK_DEBUG 64068358Snyan /* Complain if the partition is unused unless this is a floppy. */ 64143561Skato if ((lp->d_partitions[dev->d_kind.biosdisk.partition].p_fstype == FS_UNUSED) && 64268358Snyan !(od->od_flags & BD_FLOPPY)) 64343561Skato DEBUG("warning, partition marked as unused"); 64468358Snyan#endif 64543561Skato 646146010Snyan od->od_boff = 647146010Snyan lp->d_partitions[dev->d_kind.biosdisk.partition].p_offset - 648146010Snyan lp->d_partitions[RAW_PART].p_offset + 649146010Snyan sector; 65043561Skato } 651172968Snyan return (0); 65243561Skato} 65343561Skato 65443561Skato/* 65543561Skato * Search for a slice with the following preferences: 65643561Skato * 65743561Skato * 1: Active FreeBSD slice 65843561Skato * 2: Non-active FreeBSD slice 65959777Snyan * 3: Active Linux slice 66059777Snyan * 4: non-active Linux slice 66159777Snyan * 5: Active FAT/FAT32 slice 66259777Snyan * 6: non-active FAT/FAT32 slice 66343561Skato */ 66459777Snyan#define PREF_RAWDISK 0 66559777Snyan#define PREF_FBSD_ACT 1 66659777Snyan#define PREF_FBSD 2 66759777Snyan#define PREF_LINUX_ACT 3 66859777Snyan#define PREF_LINUX 4 66959777Snyan#define PREF_DOS_ACT 5 67059777Snyan#define PREF_DOS 6 67159777Snyan#define PREF_NONE 7 67243561Skato 67359777Snyan/* 674254015Smarcel * slicelimit is in the range 0 .. PC98_NPARTS 67559777Snyan */ 67643561Skatostatic int 67759777Snyanbd_bestslice(struct open_disk *od) 67843561Skato{ 679108650Snyan struct pc98_partition *dp; 68059777Snyan int pref, preflevel; 68159777Snyan int i, prefslice; 68253207Snyan 68359777Snyan prefslice = 0; 68459777Snyan preflevel = PREF_NONE; 68543561Skato 68659777Snyan dp = &od->od_slicetab[0]; 68759777Snyan for (i = 0; i < od->od_nslices; i++, dp++) { 688190029Snyan switch(dp->dp_mid & PC98_MID_MASK) { 689190029Snyan case PC98_MID_386BSD: /* FreeBSD */ 690190029Snyan if ((dp->dp_mid & PC98_MID_BOOTABLE) && 69159777Snyan (preflevel > PREF_FBSD_ACT)) { 69259777Snyan pref = i; 69359777Snyan preflevel = PREF_FBSD_ACT; 69459777Snyan } else if (preflevel > PREF_FBSD) { 69559777Snyan pref = i; 69659777Snyan preflevel = PREF_FBSD; 69759777Snyan } 69859777Snyan break; 69959777Snyan 70059777Snyan case 0x11: /* DOS/Windows */ 70159777Snyan case 0x20: 70259777Snyan case 0x21: 70359777Snyan case 0x22: 70459777Snyan case 0x23: 70559777Snyan case 0x63: 706190029Snyan if ((dp->dp_mid & PC98_MID_BOOTABLE) && 70759777Snyan (preflevel > PREF_DOS_ACT)) { 70859777Snyan pref = i; 70959777Snyan preflevel = PREF_DOS_ACT; 71059777Snyan } else if (preflevel > PREF_DOS) { 71159777Snyan pref = i; 71259777Snyan preflevel = PREF_DOS; 71359777Snyan } 71459777Snyan break; 71559777Snyan } 71643561Skato } 71759777Snyan return (prefslice); 71843561Skato} 71987734Snyan 72043561Skatostatic int 72143561Skatobd_close(struct open_file *f) 72243561Skato{ 723298230Sallanjude struct i386_devdesc *dev = f->f_devdata; 724298230Sallanjude struct open_disk *od = (struct open_disk *)(dev->d_kind.biosdisk.data); 72543561Skato 726298230Sallanjude BD(dev).bd_open--; 727298230Sallanjude if (BD(dev).bd_open == 0) { 728298230Sallanjude bcache_free(BD(dev).bd_bcache); 729298230Sallanjude BD(dev).bd_bcache = NULL; 730298230Sallanjude } 731298230Sallanjude 73243561Skato bd_closedisk(od); 73343561Skato return(0); 73443561Skato} 73543561Skato 73643561Skatostatic void 73743561Skatobd_closedisk(struct open_disk *od) 73843561Skato{ 73943561Skato DEBUG("open_disk %p", od); 74043561Skato#if 0 74143561Skato /* XXX is this required? (especially if disk already open...) */ 74243561Skato if (od->od_flags & BD_FLOPPY) 74343561Skato delay(3000000); 74443561Skato#endif 74543561Skato free(od); 74643561Skato} 74743561Skato 74843561Skatostatic int 749313355Stsoomebd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, 750298230Sallanjude char *buf, size_t *rsize) 75143561Skato{ 75243561Skato struct bcache_devdata bcd; 753298478Sallanjude struct i386_devdesc *dev = devdata; 754298230Sallanjude struct open_disk *od = (struct open_disk *)(dev->d_kind.biosdisk.data); 75558165Snyan 75643561Skato bcd.dv_strategy = bd_realstrategy; 75743561Skato bcd.dv_devdata = devdata; 758298230Sallanjude bcd.dv_cache = BD(dev).bd_bcache; 759313355Stsoome return(bcache_strategy(&bcd, rw, dblk+od->od_boff, size, buf, rsize)); 76043561Skato} 76143561Skato 76243561Skatostatic int 763313355Stsoomebd_realstrategy(void *devdata, int rw, daddr_t dblk, 764298230Sallanjude size_t size, char *buf, size_t *rsize) 76543561Skato{ 76643561Skato struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data); 76743561Skato int blks; 76843561Skato#ifdef BD_SUPPORT_FRAGS 76943561Skato char fragbuf[BIOSDISK_SECSIZE]; 77043561Skato size_t fragsize; 77143561Skato 77243561Skato fragsize = size % BIOSDISK_SECSIZE; 77343561Skato#else 77443561Skato if (size % BIOSDISK_SECSIZE) 77543561Skato panic("bd_strategy: %d bytes I/O not multiple of block size", size); 77643561Skato#endif 77743561Skato 77843561Skato DEBUG("open_disk %p", od); 77943561Skato blks = size / BIOSDISK_SECSIZE; 78043561Skato if (rsize) 78143561Skato *rsize = 0; 782172925Snyan 783172925Snyan switch(rw){ 784172925Snyan case F_READ: 785172925Snyan DEBUG("read %d from %d to %p", blks, dblk, buf); 786172925Snyan 787172925Snyan if (blks && bd_read(od, dblk, blks, buf)) { 788172925Snyan DEBUG("read error"); 789172925Snyan return (EIO); 790172925Snyan } 79143561Skato#ifdef BD_SUPPORT_FRAGS 792172925Snyan DEBUG("bd_strategy: frag read %d from %d+%d to %p", 793172925Snyan fragsize, dblk, blks, buf + (blks * BIOSDISK_SECSIZE)); 794172925Snyan if (fragsize && bd_read(od, dblk + blks, 1, fragsize)) { 795172925Snyan DEBUG("frag read error"); 796172925Snyan return(EIO); 797172925Snyan } 798172925Snyan bcopy(fragbuf, buf + (blks * BIOSDISK_SECSIZE), fragsize); 79943561Skato#endif 800172925Snyan break; 801172925Snyan case F_WRITE : 802172925Snyan DEBUG("write %d from %d to %p", blks, dblk, buf); 80387734Snyan 804172925Snyan if (blks && bd_write(od, dblk, blks, buf)) { 805172925Snyan DEBUG("write error"); 806172925Snyan return (EIO); 807172925Snyan } 80887734Snyan#ifdef BD_SUPPORT_FRAGS 80987734Snyan if(fragsize) { 810172925Snyan DEBUG("Attempted to write a frag"); 811172925Snyan return (EIO); 81287734Snyan } 81387734Snyan#endif 814172925Snyan break; 815172925Snyan default: 816172925Snyan /* DO NOTHING */ 817172925Snyan return (EROFS); 818172925Snyan } 81987734Snyan 82087734Snyan if (rsize) 82187734Snyan *rsize = size; 82287734Snyan return (0); 82343561Skato} 82443561Skato 82543561Skato/* Max number of sectors to bounce-buffer if the request crosses a 64k boundary */ 82643561Skato#define FLOPPY_BOUNCEBUF 18 82743561Skato 82843561Skatostatic int 829172965Snyanbd_chs_io(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest, int write) 83043561Skato{ 831172965Snyan u_int x, bpc, cyl, hd, sec; 832172965Snyan 833172965Snyan bpc = (od->od_sec * od->od_hds); /* blocks per cylinder */ 834172965Snyan x = dblk; 835172965Snyan cyl = x / bpc; /* block # / blocks per cylinder */ 836172965Snyan x %= bpc; /* block offset into cylinder */ 837172965Snyan hd = x / od->od_sec; /* offset / blocks per track */ 838172965Snyan sec = x % od->od_sec; /* offset into track */ 839172965Snyan 840172965Snyan v86.ctl = V86_FLAGS; 841172965Snyan v86.addr = 0x1b; 842172965Snyan if (write) 843172965Snyan v86.eax = 0x0500 | od->od_unit; 844172965Snyan else 845172965Snyan v86.eax = 0x0600 | od->od_unit; 846172965Snyan if (od->od_flags & BD_FLOPPY) { 847172965Snyan v86.eax |= 0xd000; 848172965Snyan v86.ecx = 0x0200 | (cyl & 0xff); 849172965Snyan v86.edx = (hd << 8) | (sec + 1); 850172965Snyan } else if (od->od_flags & BD_OPTICAL) { 851172965Snyan v86.eax &= 0xFF7F; 852172965Snyan v86.ecx = dblk & 0xFFFF; 853172965Snyan v86.edx = dblk >> 16; 854172965Snyan } else { 855172965Snyan v86.ecx = cyl; 856172965Snyan v86.edx = (hd << 8) | sec; 857172965Snyan } 858172965Snyan v86.ebx = blks * BIOSDISK_SECSIZE; 859172965Snyan v86.es = VTOPSEG(dest); 860172965Snyan v86.ebp = VTOPOFF(dest); 861172965Snyan v86int(); 862292682Sjhb return (V86_CY(v86.efl)); 863172965Snyan} 864172965Snyan 865172965Snyanstatic int 866172965Snyanbd_io(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest, int write) 867172965Snyan{ 868172965Snyan u_int x, sec, result, resid, retry, maxfer; 86943561Skato caddr_t p, xp, bbuf, breg; 87043561Skato 871172965Snyan /* Just in case some idiot actually tries to read/write -1 blocks... */ 87268358Snyan if (blks < 0) 87368358Snyan return (-1); 87468358Snyan 87543561Skato resid = blks; 87643561Skato p = dest; 87743561Skato 87843561Skato /* Decide whether we have to bounce */ 879153598Snyan if (VTOP(dest) >> 20 != 0 || 880153598Snyan ((VTOP(dest) >> 16) != (VTOP(dest + blks * BIOSDISK_SECSIZE) >> 16))) { 88143561Skato 88243561Skato /* 883172965Snyan * There is a 64k physical boundary somewhere in the 884172965Snyan * destination buffer, or the destination buffer is above 885172965Snyan * first 1MB of physical memory so we have to arrange a 886172965Snyan * suitable bounce buffer. Allocate a buffer twice as large 887172965Snyan * as we need to. Use the bottom half unless there is a break 888172965Snyan * there, in which case we use the top half. 88943561Skato */ 89068358Snyan x = min(od->od_sec, (unsigned)blks); 891153598Snyan bbuf = alloca(x * 2 * BIOSDISK_SECSIZE); 892172965Snyan if (((u_int32_t)VTOP(bbuf) & 0xffff0000) == 893172965Snyan ((u_int32_t)VTOP(bbuf + x * BIOSDISK_SECSIZE) & 0xffff0000)) { 89443561Skato breg = bbuf; 89543561Skato } else { 89643561Skato breg = bbuf + x * BIOSDISK_SECSIZE; 89743561Skato } 898172965Snyan maxfer = x; /* limit transfers to bounce region size */ 89943561Skato } else { 90068358Snyan breg = bbuf = NULL; 90143561Skato maxfer = 0; 90243561Skato } 90343561Skato 90443561Skato while (resid > 0) { 905172965Snyan /* 906172965Snyan * Play it safe and don't cross track boundaries. 907172965Snyan * (XXX this is probably unnecessary) 908172965Snyan */ 909172965Snyan sec = dblk % od->od_sec; /* offset into track */ 91043561Skato x = min(od->od_sec - sec, resid); 91143561Skato if (maxfer > 0) 91243561Skato x = min(x, maxfer); /* fit bounce buffer */ 91343561Skato 91443561Skato /* where do we transfer to? */ 91543561Skato xp = bbuf == NULL ? p : breg; 91643561Skato 917172965Snyan /* 918172965Snyan * Put your Data In, Put your Data out, 919172965Snyan * Put your Data In, and shake it all about 920172965Snyan */ 921172965Snyan if (write && bbuf != NULL) 922172965Snyan bcopy(p, breg, x * BIOSDISK_SECSIZE); 92343561Skato 924172965Snyan /* 925172965Snyan * Loop retrying the operation a couple of times. The BIOS 926172965Snyan * may also retry. 927172965Snyan */ 92843561Skato for (retry = 0; retry < 3; retry++) { 92943561Skato /* if retrying, reset the drive */ 93043561Skato if (retry > 0) { 93151586Skato v86.ctl = V86_FLAGS; 93251586Skato v86.addr = 0x1b; 93351586Skato v86.eax = 0x0300 | od->od_unit; 93443561Skato v86int(); 93543561Skato } 936172965Snyan 937172965Snyan result = bd_chs_io(od, dblk, x, xp, write); 93843561Skato if (result == 0) 93943561Skato break; 94043561Skato } 941172965Snyan 942172965Snyan if (write) 943200631Snyan DEBUG("Write %d sector(s) from %p (0x%x) to %lld %s", x, 944200631Snyan p, VTOP(p), dblk, result ? "failed" : "ok"); 945172965Snyan else 946200631Snyan DEBUG("Read %d sector(s) from %lld to %p (0x%x) %s", x, 947200631Snyan dblk, p, VTOP(p), result ? "failed" : "ok"); 94843561Skato if (result) { 94943561Skato return(-1); 95043561Skato } 951172965Snyan if (!write && bbuf != NULL) 95243561Skato bcopy(breg, p, x * BIOSDISK_SECSIZE); 95343561Skato p += (x * BIOSDISK_SECSIZE); 95443561Skato dblk += x; 95543561Skato resid -= x; 95643561Skato } 957172965Snyan 95843561Skato/* hexdump(dest, (blks * BIOSDISK_SECSIZE)); */ 95943561Skato return(0); 96043561Skato} 96143561Skato 962172965Snyanstatic int 963172965Snyanbd_read(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest) 964172965Snyan{ 96587734Snyan 966172965Snyan return (bd_io(od, dblk, blks, dest, 0)); 967172965Snyan} 968172965Snyan 96943561Skatostatic int 97087734Snyanbd_write(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest) 97187734Snyan{ 97287734Snyan 973172965Snyan return (bd_io(od, dblk, blks, dest, 1)); 974172965Snyan} 97587734Snyan 97687734Snyanstatic int 97743561Skatobd_getgeom(struct open_disk *od) 97843561Skato{ 97943561Skato 98043561Skato if (od->od_flags & BD_FLOPPY) { 98154819Snyan od->od_cyl = 79; 98243561Skato od->od_hds = 2; 98343561Skato od->od_sec = (od->od_unit & 0xf0) == 0x30 ? 18 : 15; 984108791Snyan } else if (od->od_flags & BD_OPTICAL) { 985108791Snyan od->od_cyl = 0xFFFE; 986108791Snyan od->od_hds = 8; 987108791Snyan od->od_sec = 32; 98859777Snyan } else { 98954819Snyan v86.ctl = V86_FLAGS; 99043561Skato v86.addr = 0x1b; 99143561Skato v86.eax = 0x8400 | od->od_unit; 99243561Skato v86int(); 99343561Skato 99443561Skato od->od_cyl = v86.ecx; 99543561Skato od->od_hds = (v86.edx >> 8) & 0xff; 99643561Skato od->od_sec = v86.edx & 0xff; 997292682Sjhb if (V86_CY(v86.efl)) 99851586Skato return(1); 99943561Skato } 100043561Skato 100143561Skato DEBUG("unit 0x%x geometry %d/%d/%d", od->od_unit, od->od_cyl, od->od_hds, od->od_sec); 100243561Skato return(0); 100343561Skato} 100443561Skato 100543561Skato/* 100653207Snyan * Return the BIOS geometry of a given "fixed drive" in a format 100753207Snyan * suitable for the legacy bootinfo structure. Since the kernel is 100853207Snyan * expecting raw int 0x13/0x8 values for N_BIOS_GEOM drives, we 100953207Snyan * prefer to get the information directly, rather than rely on being 101053207Snyan * able to put it together from information already maintained for 101153207Snyan * different purposes and for a probably different number of drives. 101253207Snyan * 101353207Snyan * For valid drives, the geometry is expected in the format (31..0) 101453207Snyan * "000000cc cccccccc hhhhhhhh 00ssssss"; and invalid drives are 101553207Snyan * indicated by returning the geometry of a "1.2M" PC-format floppy 101653207Snyan * disk. And, incidentally, what is returned is not the geometry as 101753207Snyan * such but the highest valid cylinder, head, and sector numbers. 101853207Snyan */ 101953207Snyanu_int32_t 102053207Snyanbd_getbigeom(int bunit) 102153207Snyan{ 102254819Snyan int hds = 0; 102355339Snyan int unit = 0x80; /* IDE HDD */ 102454819Snyan u_int addr = 0xA155d; 102555339Snyan 102654819Snyan while (unit < 0xa7) { 102755339Snyan if (*(u_char *)PTOV(addr) & (1 << (unit & 0x0f))) 102855339Snyan if (hds++ == bunit) 102954819Snyan break; 1030108791Snyan 1031108791Snyan if (unit >= 0xA0) { 1032108791Snyan int media = ((unsigned *)PTOV(0xA1460))[unit & 0x0F] & 0x1F; 1033108791Snyan 1034108791Snyan if (media == 7 && hds++ == bunit) /* SCSI MO */ 1035108791Snyan return(0xFFFE0820); /* C:65535 H:8 S:32 */ 1036108791Snyan } 103754819Snyan if (++unit == 0x84) { 1038108791Snyan unit = 0xA0; /* SCSI HDD */ 103954819Snyan addr = 0xA1482; 104054819Snyan } 104154819Snyan } 104254819Snyan if (unit == 0xa7) 1043108791Snyan return 0x4F020F; /* 1200KB FD C:80 H:2 S:15 */ 104453207Snyan v86.ctl = V86_FLAGS; 104554819Snyan v86.addr = 0x1b; 104654819Snyan v86.eax = 0x8400 | unit; 104754819Snyan v86int(); 1048292682Sjhb if (V86_CY(v86.efl)) 1049108791Snyan return 0x4F020F; /* 1200KB FD C:80 H:2 S:15 */ 105054819Snyan return ((v86.ecx & 0xffff) << 16) | (v86.edx & 0xffff); 105153207Snyan} 105253207Snyan 105353207Snyan/* 1054130603Sphk * Return a suitable dev_t value for (dev). 105543561Skato * 105643561Skato * In the case where it looks like (dev) is a SCSI disk, we allow the number of 105743561Skato * IDE disks to be specified in $num_ide_disks. There should be a Better Way. 105843561Skato */ 105943561Skatoint 106043561Skatobd_getdev(struct i386_devdesc *dev) 106143561Skato{ 106243561Skato struct open_disk *od; 106343561Skato int biosdev; 106443561Skato int major; 106543561Skato int rootdev; 106643561Skato char *nip, *cp; 106743561Skato int unitofs = 0, i, unit; 106843561Skato 1069332154Skevans biosdev = bd_unit2bios(dev->dd.d_unit); 1070332154Skevans DEBUG("unit %d BIOS device %d", dev->dd.d_unit, biosdev); 107143561Skato if (biosdev == -1) /* not a BIOS device */ 107243561Skato return(-1); 107343561Skato if (bd_opendisk(&od, dev) != 0) /* oops, not a viable device */ 107443561Skato return(-1); 107543561Skato 107643561Skato if ((biosdev & 0xf0) == 0x90 || (biosdev & 0xf0) == 0x30) { 107743561Skato /* floppy (or emulated floppy) or ATAPI device */ 1078332154Skevans if (bdinfo[dev->dd.d_unit].bd_type == DT_ATAPI) { 107943561Skato /* is an ATAPI disk */ 108043561Skato major = WFDMAJOR; 108143561Skato } else { 108243561Skato /* is a floppy disk */ 108343561Skato major = FDMAJOR; 108443561Skato } 108543561Skato } else { 108643561Skato /* harddisk */ 108743561Skato if ((od->od_flags & BD_LABELOK) && (od->od_disklabel.d_type == DTYPE_SCSI)) { 108843561Skato /* label OK, disk labelled as SCSI */ 108943561Skato major = DAMAJOR; 109043561Skato /* check for unit number correction hint, now deprecated */ 109143561Skato if ((nip = getenv("num_ide_disks")) != NULL) { 109243561Skato i = strtol(nip, &cp, 0); 109343561Skato /* check for parse error */ 109443561Skato if ((cp != nip) && (*cp == 0)) 109543561Skato unitofs = i; 109643561Skato } 109743561Skato } else { 109843561Skato /* assume an IDE disk */ 109943561Skato major = WDMAJOR; 110043561Skato } 110143561Skato } 110268358Snyan /* default root disk unit number */ 110368358Snyan if ((biosdev & 0xf0) == 0xa0) 1104332154Skevans unit = bdinfo[dev->dd.d_unit].bd_da_unit; 110568358Snyan else 110668358Snyan unit = biosdev & 0xf; 110768358Snyan 110843561Skato /* XXX a better kludge to set the root disk unit number */ 110943561Skato if ((nip = getenv("root_disk_unit")) != NULL) { 111043561Skato i = strtol(nip, &cp, 0); 111143561Skato /* check for parse error */ 111243561Skato if ((cp != nip) && (*cp == 0)) 111343561Skato unit = i; 111443561Skato } 111543561Skato 1116172921Sjhb rootdev = MAKEBOOTDEV(major, dev->d_kind.biosdisk.slice + 1, unit, 1117172921Sjhb dev->d_kind.biosdisk.partition); 111843561Skato DEBUG("dev is 0x%x\n", rootdev); 111943561Skato return(rootdev); 112043561Skato} 1121