diff options
Diffstat (limited to 'stand/i386/libi386/biosdisk.c')
| -rw-r--r-- | stand/i386/libi386/biosdisk.c | 1013 |
1 files changed, 1013 insertions, 0 deletions
diff --git a/stand/i386/libi386/biosdisk.c b/stand/i386/libi386/biosdisk.c new file mode 100644 index 0000000..a2147e2 --- /dev/null +++ b/stand/i386/libi386/biosdisk.c @@ -0,0 +1,1013 @@ +/*- + * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> + * Copyright (c) 2012 Andrey V. Elsukov <ae@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/* + * BIOS disk device handling. + * + * Ideas and algorithms from: + * + * - NetBSD libi386/biosdisk.c + * - FreeBSD biosboot/disk.c + * + */ + +#include <sys/disk.h> +#include <sys/limits.h> +#include <stand.h> +#include <machine/bootinfo.h> +#include <stdarg.h> + +#include <bootstrap.h> +#include <btxv86.h> +#include <edd.h> +#include "disk.h" +#include "libi386.h" + +#ifdef LOADER_GELI_SUPPORT +#include "cons.h" +#include "drv.h" +#include "gpt.h" +#include "part.h" +#include <uuid.h> +struct pentry { + struct ptable_entry part; + uint64_t flags; + union { + uint8_t bsd; + uint8_t mbr; + uuid_t gpt; + uint16_t vtoc8; + } type; + STAILQ_ENTRY(pentry) entry; +}; +struct ptable { + enum ptable_type type; + uint16_t sectorsize; + uint64_t sectors; + + STAILQ_HEAD(, pentry) entries; +}; + +#include "geliboot.c" +#endif /* LOADER_GELI_SUPPORT */ + +CTASSERT(sizeof(struct i386_devdesc) >= sizeof(struct disk_devdesc)); + +#define BIOS_NUMDRIVES 0x475 +#define BIOSDISK_SECSIZE 512 +#define BUFSIZE (1 * BIOSDISK_SECSIZE) + +#define DT_ATAPI 0x10 /* disk type for ATAPI floppies */ +#define WDMAJOR 0 /* major numbers for devices we frontend for */ +#define WFDMAJOR 1 +#define FDMAJOR 2 +#define DAMAJOR 4 + +#ifdef DISK_DEBUG +# define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args) +#else +# define DEBUG(fmt, args...) +#endif + +/* + * List of BIOS devices, translation from disk unit number to + * BIOS unit number. + */ +static struct bdinfo +{ + int bd_unit; /* BIOS unit number */ + int bd_cyl; /* BIOS geometry */ + int bd_hds; + int bd_sec; + int bd_flags; +#define BD_MODEINT13 0x0000 +#define BD_MODEEDD1 0x0001 +#define BD_MODEEDD3 0x0002 +#define BD_MODEMASK 0x0003 +#define BD_FLOPPY 0x0004 + int bd_type; /* BIOS 'drive type' (floppy only) */ + uint16_t bd_sectorsize; /* Sector size */ + uint64_t bd_sectors; /* Disk size */ + int bd_open; /* reference counter */ + void *bd_bcache; /* buffer cache data */ +} bdinfo [MAXBDDEV]; +static int nbdinfo = 0; + +#define BD(dev) (bdinfo[(dev)->d_unit]) + +static int bd_read(struct disk_devdesc *dev, daddr_t dblk, int blks, + caddr_t dest); +static int bd_write(struct disk_devdesc *dev, daddr_t dblk, int blks, + caddr_t dest); +static int bd_int13probe(struct bdinfo *bd); + +static int bd_init(void); +static int bd_strategy(void *devdata, int flag, daddr_t dblk, size_t size, + char *buf, size_t *rsize); +static int bd_realstrategy(void *devdata, int flag, daddr_t dblk, size_t size, + char *buf, size_t *rsize); +static int bd_open(struct open_file *f, ...); +static int bd_close(struct open_file *f); +static int bd_ioctl(struct open_file *f, u_long cmd, void *data); +static int bd_print(int verbose); + +#ifdef LOADER_GELI_SUPPORT +enum isgeli { + ISGELI_UNKNOWN, + ISGELI_NO, + ISGELI_YES +}; +static enum isgeli geli_status[MAXBDDEV][MAXTBLENTS]; + +int bios_read(void *vdev __unused, struct dsk *priv, off_t off, char *buf, + size_t bytes); +#endif /* LOADER_GELI_SUPPORT */ + +struct devsw biosdisk = { + "disk", + DEVT_DISK, + bd_init, + bd_strategy, + bd_open, + bd_close, + bd_ioctl, + bd_print, + NULL +}; + +/* + * Translate between BIOS device numbers and our private unit numbers. + */ +int +bd_bios2unit(int biosdev) +{ + int i; + + DEBUG("looking for bios device 0x%x", biosdev); + for (i = 0; i < nbdinfo; i++) { + DEBUG("bd unit %d is BIOS device 0x%x", i, bdinfo[i].bd_unit); + if (bdinfo[i].bd_unit == biosdev) + return (i); + } + return (-1); +} + +int +bd_unit2bios(int unit) +{ + + if ((unit >= 0) && (unit < nbdinfo)) + return (bdinfo[unit].bd_unit); + return (-1); +} + +/* + * Quiz the BIOS for disk devices, save a little info about them. + */ +static int +bd_init(void) +{ + int base, unit, nfd = 0; + +#ifdef LOADER_GELI_SUPPORT + geli_init(); +#endif + /* sequence 0, 0x80 */ + for (base = 0; base <= 0x80; base += 0x80) { + for (unit = base; (nbdinfo < MAXBDDEV); unit++) { +#ifndef VIRTUALBOX + /* + * Check the BIOS equipment list for number + * of fixed disks. + */ + if(base == 0x80 && + (nfd >= *(unsigned char *)PTOV(BIOS_NUMDRIVES))) + break; +#endif + bdinfo[nbdinfo].bd_open = 0; + bdinfo[nbdinfo].bd_bcache = NULL; + bdinfo[nbdinfo].bd_unit = unit; + bdinfo[nbdinfo].bd_flags = unit < 0x80 ? BD_FLOPPY: 0; + if (!bd_int13probe(&bdinfo[nbdinfo])) + break; + + /* XXX we need "disk aliases" to make this simpler */ + printf("BIOS drive %c: is disk%d\n", (unit < 0x80) ? + ('A' + unit): ('C' + unit - 0x80), nbdinfo); + nbdinfo++; + if (base == 0x80) + nfd++; + } + } + bcache_add_dev(nbdinfo); + return(0); +} + +/* + * Try to detect a device supported by the legacy int13 BIOS + */ +static int +bd_int13probe(struct bdinfo *bd) +{ + struct edd_params params; + int ret = 1; /* assume success */ + + v86.ctl = V86_FLAGS; + v86.addr = 0x13; + v86.eax = 0x800; + v86.edx = bd->bd_unit; + v86int(); + + /* Don't error out if we get bad sector number, try EDD as well */ + if (V86_CY(v86.efl) || /* carry set */ + (v86.edx & 0xff) <= (unsigned)(bd->bd_unit & 0x7f)) /* unit # bad */ + return (0); /* skip device */ + + if ((v86.ecx & 0x3f) == 0) /* absurd sector number */ + ret = 0; /* set error */ + + /* Convert max cyl # -> # of cylinders */ + bd->bd_cyl = ((v86.ecx & 0xc0) << 2) + ((v86.ecx & 0xff00) >> 8) + 1; + /* Convert max head # -> # of heads */ + bd->bd_hds = ((v86.edx & 0xff00) >> 8) + 1; + bd->bd_sec = v86.ecx & 0x3f; + bd->bd_type = v86.ebx & 0xff; + bd->bd_flags |= BD_MODEINT13; + + /* Calculate sectors count from the geometry */ + bd->bd_sectors = bd->bd_cyl * bd->bd_hds * bd->bd_sec; + bd->bd_sectorsize = BIOSDISK_SECSIZE; + DEBUG("unit 0x%x geometry %d/%d/%d", bd->bd_unit, bd->bd_cyl, + bd->bd_hds, bd->bd_sec); + + /* Determine if we can use EDD with this device. */ + v86.ctl = V86_FLAGS; + v86.addr = 0x13; + v86.eax = 0x4100; + v86.edx = bd->bd_unit; + v86.ebx = 0x55aa; + v86int(); + if (V86_CY(v86.efl) || /* carry set */ + (v86.ebx & 0xffff) != 0xaa55 || /* signature */ + (v86.ecx & EDD_INTERFACE_FIXED_DISK) == 0) + return (ret); /* return code from int13 AH=08 */ + + /* EDD supported */ + bd->bd_flags |= BD_MODEEDD1; + if ((v86.eax & 0xff00) >= 0x3000) + bd->bd_flags |= BD_MODEEDD3; + /* Get disk params */ + params.len = sizeof(struct edd_params); + v86.ctl = V86_FLAGS; + v86.addr = 0x13; + v86.eax = 0x4800; + v86.edx = bd->bd_unit; + v86.ds = VTOPSEG(¶ms); + v86.esi = VTOPOFF(¶ms); + v86int(); + if (!V86_CY(v86.efl)) { + uint64_t total; + + /* + * Sector size must be a multiple of 512 bytes. + * An alternate test would be to check power of 2, + * powerof2(params.sector_size). + */ + if (params.sector_size % BIOSDISK_SECSIZE) + bd->bd_sectorsize = BIOSDISK_SECSIZE; + else + bd->bd_sectorsize = params.sector_size; + + total = bd->bd_sectorsize * params.sectors; + if (params.sectors != 0) { + /* Only update if we did not overflow. */ + if (total > params.sectors) + bd->bd_sectors = params.sectors; + } + + total = (uint64_t)params.cylinders * + params.heads * params.sectors_per_track; + if (bd->bd_sectors < total) + bd->bd_sectors = total; + + ret = 1; + } + DEBUG("unit 0x%x flags %x, sectors %llu, sectorsize %u", + bd->bd_unit, bd->bd_flags, bd->bd_sectors, bd->bd_sectorsize); + return (ret); +} + +/* + * Print information about disks + */ +static int +bd_print(int verbose) +{ + static char line[80]; + struct disk_devdesc dev; + int i, ret = 0; + + if (nbdinfo == 0) + return (0); + + printf("%s devices:", biosdisk.dv_name); + if ((ret = pager_output("\n")) != 0) + return (ret); + + for (i = 0; i < nbdinfo; i++) { + snprintf(line, sizeof(line), + " disk%d: BIOS drive %c (%ju X %u):\n", i, + (bdinfo[i].bd_unit < 0x80) ? ('A' + bdinfo[i].bd_unit): + ('C' + bdinfo[i].bd_unit - 0x80), + (uintmax_t)bdinfo[i].bd_sectors, + bdinfo[i].bd_sectorsize); + if ((ret = pager_output(line)) != 0) + break; + dev.d_dev = &biosdisk; + dev.d_unit = i; + dev.d_slice = -1; + dev.d_partition = -1; + if (disk_open(&dev, + bdinfo[i].bd_sectorsize * bdinfo[i].bd_sectors, + bdinfo[i].bd_sectorsize) == 0) { + snprintf(line, sizeof(line), " disk%d", i); + ret = disk_print(&dev, line, verbose); + disk_close(&dev); + if (ret != 0) + return (ret); + } + } + return (ret); +} + +/* + * Attempt to open the disk described by (dev) for use by (f). + * + * Note that the philosophy here is "give them exactly what + * they ask for". This is necessary because being too "smart" + * about what the user might want leads to complications. + * (eg. given no slice or partition value, with a disk that is + * sliced - are they after the first BSD slice, or the DOS + * slice before it?) + */ +static int +bd_open(struct open_file *f, ...) +{ + struct disk_devdesc *dev, rdev; + struct disk_devdesc disk; + int err, g_err; + va_list ap; + uint64_t size; + + va_start(ap, f); + dev = va_arg(ap, struct disk_devdesc *); + va_end(ap); + + if (dev->d_unit < 0 || dev->d_unit >= nbdinfo) + return (EIO); + BD(dev).bd_open++; + if (BD(dev).bd_bcache == NULL) + BD(dev).bd_bcache = bcache_allocate(); + + /* + * Read disk size from partition. + * This is needed to work around buggy BIOS systems returning + * wrong (truncated) disk media size. + * During bd_probe() we tested if the mulitplication of bd_sectors + * would overflow so it should be safe to perform here. + */ + disk.d_dev = dev->d_dev; + disk.d_type = dev->d_type; + disk.d_unit = dev->d_unit; + disk.d_opendata = NULL; + disk.d_slice = -1; + disk.d_partition = -1; + disk.d_offset = 0; + if (disk_open(&disk, BD(dev).bd_sectors * BD(dev).bd_sectorsize, + BD(dev).bd_sectorsize) == 0) { + + if (disk_ioctl(&disk, DIOCGMEDIASIZE, &size) == 0) { + size /= BD(dev).bd_sectorsize; + if (size > BD(dev).bd_sectors) + BD(dev).bd_sectors = size; + } + disk_close(&disk); + } + + err = disk_open(dev, BD(dev).bd_sectors * BD(dev).bd_sectorsize, + BD(dev).bd_sectorsize); + +#ifdef LOADER_GELI_SUPPORT + static char gelipw[GELI_PW_MAXLEN]; + char *passphrase; + + if (err) + return (err); + + /* if we already know there is no GELI, skip the rest */ + if (geli_status[dev->d_unit][dev->d_slice] != ISGELI_UNKNOWN) + return (err); + + struct dsk dskp; + struct ptable *table = NULL; + struct ptable_entry part; + struct pentry *entry; + int geli_part = 0; + + dskp.drive = bd_unit2bios(dev->d_unit); + dskp.type = dev->d_type; + dskp.unit = dev->d_unit; + dskp.slice = dev->d_slice; + dskp.part = dev->d_partition; + dskp.start = dev->d_offset; + + memcpy(&rdev, dev, sizeof(rdev)); + /* to read the GPT table, we need to read the first sector */ + rdev.d_offset = 0; + /* We need the LBA of the end of the partition */ + table = ptable_open(&rdev, BD(dev).bd_sectors, + BD(dev).bd_sectorsize, ptblread); + if (table == NULL) { + DEBUG("Can't read partition table"); + /* soft failure, return the exit status of disk_open */ + return (err); + } + + if (table->type == PTABLE_GPT) + dskp.part = 255; + + STAILQ_FOREACH(entry, &table->entries, entry) { + dskp.slice = entry->part.index; + dskp.start = entry->part.start; + if (is_geli(&dskp) == 0) { + geli_status[dev->d_unit][dskp.slice] = ISGELI_YES; + return (0); + } + if (geli_taste(bios_read, &dskp, + entry->part.end - entry->part.start) == 0) { + if (geli_havekey(&dskp) == 0) { + geli_status[dev->d_unit][dskp.slice] = ISGELI_YES; + geli_part++; + continue; + } + if ((passphrase = getenv("kern.geom.eli.passphrase")) + != NULL) { + /* Use the cached passphrase */ + bcopy(passphrase, &gelipw, GELI_PW_MAXLEN); + } + if (geli_passphrase(&gelipw, dskp.unit, 'p', + (dskp.slice > 0 ? dskp.slice : dskp.part), + &dskp) == 0) { + setenv("kern.geom.eli.passphrase", &gelipw, 1); + bzero(gelipw, sizeof(gelipw)); + geli_status[dev->d_unit][dskp.slice] = ISGELI_YES; + geli_part++; + continue; + } + } else + geli_status[dev->d_unit][dskp.slice] = ISGELI_NO; + } + + /* none of the partitions on this disk have GELI */ + if (geli_part == 0) { + /* found no GELI */ + geli_status[dev->d_unit][dev->d_slice] = ISGELI_NO; + } +#endif /* LOADER_GELI_SUPPORT */ + + return (err); +} + +static int +bd_close(struct open_file *f) +{ + struct disk_devdesc *dev; + + dev = (struct disk_devdesc *)f->f_devdata; + BD(dev).bd_open--; + if (BD(dev).bd_open == 0) { + bcache_free(BD(dev).bd_bcache); + BD(dev).bd_bcache = NULL; + } + return (disk_close(dev)); +} + +static int +bd_ioctl(struct open_file *f, u_long cmd, void *data) +{ + struct disk_devdesc *dev; + int rc; + + dev = (struct disk_devdesc *)f->f_devdata; + + rc = disk_ioctl(dev, cmd, data); + if (rc != ENOTTY) + return (rc); + + switch (cmd) { + case DIOCGSECTORSIZE: + *(u_int *)data = BD(dev).bd_sectorsize; + break; + case DIOCGMEDIASIZE: + *(uint64_t *)data = BD(dev).bd_sectors * BD(dev).bd_sectorsize; + break; + default: + return (ENOTTY); + } + return (0); +} + +static int +bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, + char *buf, size_t *rsize) +{ + struct bcache_devdata bcd; + struct disk_devdesc *dev; + + dev = (struct disk_devdesc *)devdata; + bcd.dv_strategy = bd_realstrategy; + bcd.dv_devdata = devdata; + bcd.dv_cache = BD(dev).bd_bcache; + return (bcache_strategy(&bcd, rw, dblk + dev->d_offset, + size, buf, rsize)); +} + +static int +bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size, + char *buf, size_t *rsize) +{ + struct disk_devdesc *dev = (struct disk_devdesc *)devdata; + uint64_t disk_blocks; + int blks, rc; +#ifdef BD_SUPPORT_FRAGS /* XXX: sector size */ + char fragbuf[BIOSDISK_SECSIZE]; + size_t fragsize; + + fragsize = size % BIOSDISK_SECSIZE; +#else + if (size % BD(dev).bd_sectorsize) + panic("bd_strategy: %d bytes I/O not multiple of block size", size); +#endif + + DEBUG("open_disk %p", dev); + + /* + * Check the value of the size argument. We do have quite small + * heap (64MB), but we do not know good upper limit, so we check against + * INT_MAX here. This will also protect us against possible overflows + * while translating block count to bytes. + */ + if (size > INT_MAX) { + DEBUG("too large read: %zu bytes", size); + return (EIO); + } + + blks = size / BD(dev).bd_sectorsize; + if (dblk > dblk + blks) + return (EIO); + + if (rsize) + *rsize = 0; + + /* Get disk blocks, this value is either for whole disk or for partition */ + if (disk_ioctl(dev, DIOCGMEDIASIZE, &disk_blocks)) { + /* DIOCGMEDIASIZE does return bytes. */ + disk_blocks /= BD(dev).bd_sectorsize; + } else { + /* We should not get here. Just try to survive. */ + disk_blocks = BD(dev).bd_sectors - dev->d_offset; + } + + /* Validate source block address. */ + if (dblk < dev->d_offset || dblk >= dev->d_offset + disk_blocks) + return (EIO); + + /* + * Truncate if we are crossing disk or partition end. + */ + if (dblk + blks >= dev->d_offset + disk_blocks) { + blks = dev->d_offset + disk_blocks - dblk; + size = blks * BD(dev).bd_sectorsize; + DEBUG("short read %d", blks); + } + + switch (rw & F_MASK) { + case F_READ: + DEBUG("read %d from %lld to %p", blks, dblk, buf); + + if (blks && (rc = bd_read(dev, dblk, blks, buf))) { + /* Filter out floppy controller errors */ + if (BD(dev).bd_flags != BD_FLOPPY || rc != 0x20) { + printf("read %d from %lld to %p, error: 0x%x", blks, dblk, + buf, rc); + } + return (EIO); + } +#ifdef BD_SUPPORT_FRAGS /* XXX: sector size */ + DEBUG("bd_strategy: frag read %d from %d+%d to %p", + fragsize, dblk, blks, buf + (blks * BIOSDISK_SECSIZE)); + if (fragsize && bd_read(od, dblk + blks, 1, fragsize)) { + DEBUG("frag read error"); + return(EIO); + } + bcopy(fragbuf, buf + (blks * BIOSDISK_SECSIZE), fragsize); +#endif + break; + case F_WRITE : + DEBUG("write %d from %d to %p", blks, dblk, buf); + + if (blks && bd_write(dev, dblk, blks, buf)) { + DEBUG("write error"); + return (EIO); + } +#ifdef BD_SUPPORT_FRAGS + if(fragsize) { + DEBUG("Attempted to write a frag"); + return (EIO); + } +#endif + break; + default: + /* DO NOTHING */ + return (EROFS); + } + + if (rsize) + *rsize = size; + return (0); +} + +static int +bd_edd_io(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest, + int write) +{ + static struct edd_packet packet; + + packet.len = sizeof(struct edd_packet); + packet.count = blks; + packet.off = VTOPOFF(dest); + packet.seg = VTOPSEG(dest); + packet.lba = dblk; + v86.ctl = V86_FLAGS; + v86.addr = 0x13; + if (write) + /* Should we Write with verify ?? 0x4302 ? */ + v86.eax = 0x4300; + else + v86.eax = 0x4200; + v86.edx = BD(dev).bd_unit; + v86.ds = VTOPSEG(&packet); + v86.esi = VTOPOFF(&packet); + v86int(); + if (V86_CY(v86.efl)) + return (v86.eax >> 8); + return (0); +} + +static int +bd_chs_io(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest, + int write) +{ + u_int x, bpc, cyl, hd, sec; + + bpc = BD(dev).bd_sec * BD(dev).bd_hds; /* blocks per cylinder */ + x = dblk; + cyl = x / bpc; /* block # / blocks per cylinder */ + x %= bpc; /* block offset into cylinder */ + hd = x / BD(dev).bd_sec; /* offset / blocks per track */ + sec = x % BD(dev).bd_sec; /* offset into track */ + + /* correct sector number for 1-based BIOS numbering */ + sec++; + + if (cyl > 1023) + /* CHS doesn't support cylinders > 1023. */ + return (1); + + v86.ctl = V86_FLAGS; + v86.addr = 0x13; + if (write) + v86.eax = 0x300 | blks; + else + v86.eax = 0x200 | blks; + v86.ecx = ((cyl & 0xff) << 8) | ((cyl & 0x300) >> 2) | sec; + v86.edx = (hd << 8) | BD(dev).bd_unit; + v86.es = VTOPSEG(dest); + v86.ebx = VTOPOFF(dest); + v86int(); + if (V86_CY(v86.efl)) + return (v86.eax >> 8); + return (0); +} + +static int +bd_io(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest, int write) +{ + u_int x, sec, result, resid, retry, maxfer; + caddr_t p, xp, bbuf; + + /* Just in case some idiot actually tries to read/write -1 blocks... */ + if (blks < 0) + return (-1); + + resid = blks; + p = dest; + + /* Decide whether we have to bounce */ + if (VTOP(dest) >> 20 != 0 || (BD(dev).bd_unit < 0x80 && + (VTOP(dest) >> 16) != (VTOP(dest + + blks * BD(dev).bd_sectorsize) >> 16))) { + + /* + * There is a 64k physical boundary somewhere in the + * destination buffer, or the destination buffer is above + * first 1MB of physical memory so we have to arrange a + * suitable bounce buffer. Allocate a buffer twice as large + * as we need to. Use the bottom half unless there is a break + * there, in which case we use the top half. + */ + x = V86_IO_BUFFER_SIZE / BD(dev).bd_sectorsize; + x = min(x, (unsigned)blks); + bbuf = PTOV(V86_IO_BUFFER); + maxfer = x; /* limit transfers to bounce region size */ + } else { + bbuf = NULL; + maxfer = 0; + } + + while (resid > 0) { + /* + * Play it safe and don't cross track boundaries. + * (XXX this is probably unnecessary) + */ + sec = dblk % BD(dev).bd_sec; /* offset into track */ + x = min(BD(dev).bd_sec - sec, resid); + if (maxfer > 0) + x = min(x, maxfer); /* fit bounce buffer */ + + /* where do we transfer to? */ + xp = bbuf == NULL ? p : bbuf; + + /* + * Put your Data In, Put your Data out, + * Put your Data In, and shake it all about + */ + if (write && bbuf != NULL) + bcopy(p, bbuf, x * BD(dev).bd_sectorsize); + + /* + * Loop retrying the operation a couple of times. The BIOS + * may also retry. + */ + for (retry = 0; retry < 3; retry++) { + /* if retrying, reset the drive */ + if (retry > 0) { + v86.ctl = V86_FLAGS; + v86.addr = 0x13; + v86.eax = 0; + v86.edx = BD(dev).bd_unit; + v86int(); + } + + if (BD(dev).bd_flags & BD_MODEEDD1) + result = bd_edd_io(dev, dblk, x, xp, write); + else + result = bd_chs_io(dev, dblk, x, xp, write); + if (result == 0) + break; + } + + if (write) + DEBUG("Write %d sector(s) from %p (0x%x) to %lld %s", x, + p, VTOP(p), dblk, result ? "failed" : "ok"); + else + DEBUG("Read %d sector(s) from %lld to %p (0x%x) %s", x, + dblk, p, VTOP(p), result ? "failed" : "ok"); + if (result) { + return (result); + } + if (!write && bbuf != NULL) + bcopy(bbuf, p, x * BD(dev).bd_sectorsize); + p += (x * BD(dev).bd_sectorsize); + dblk += x; + resid -= x; + } + +/* hexdump(dest, (blks * BD(dev).bd_sectorsize)); */ + return(0); +} + +static int +bd_read(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest) +{ +#ifdef LOADER_GELI_SUPPORT + struct dsk dskp; + off_t p_off, diff; + daddr_t alignlba; + int err, n, alignblks; + char *tmpbuf; + + /* if we already know there is no GELI, skip the rest */ + if (geli_status[dev->d_unit][dev->d_slice] != ISGELI_YES) + return (bd_io(dev, dblk, blks, dest, 0)); + + if (geli_status[dev->d_unit][dev->d_slice] == ISGELI_YES) { + /* + * Align reads to DEV_GELIBOOT_BSIZE bytes because partial + * sectors cannot be decrypted. Round the requested LBA down to + * nearest multiple of DEV_GELIBOOT_BSIZE bytes. + */ + alignlba = rounddown2(dblk * BD(dev).bd_sectorsize, + DEV_GELIBOOT_BSIZE) / BD(dev).bd_sectorsize; + /* + * Round number of blocks to read up to nearest multiple of + * DEV_GELIBOOT_BSIZE + */ + diff = (dblk - alignlba) * BD(dev).bd_sectorsize; + alignblks = roundup2(blks * BD(dev).bd_sectorsize + diff, + DEV_GELIBOOT_BSIZE) / BD(dev).bd_sectorsize; + + /* + * If the read is rounded up to a larger size, use a temporary + * buffer here because the buffer provided by the caller may be + * too small. + */ + if (diff == 0) { + tmpbuf = dest; + } else { + tmpbuf = malloc(alignblks * BD(dev).bd_sectorsize); + if (tmpbuf == NULL) { + return (-1); + } + } + + err = bd_io(dev, alignlba, alignblks, tmpbuf, 0); + if (err) + return (err); + + dskp.drive = bd_unit2bios(dev->d_unit); + dskp.type = dev->d_type; + dskp.unit = dev->d_unit; + dskp.slice = dev->d_slice; + dskp.part = dev->d_partition; + dskp.start = dev->d_offset; + + /* GELI needs the offset relative to the partition start */ + p_off = alignlba - dskp.start; + + err = geli_read(&dskp, p_off * BD(dev).bd_sectorsize, tmpbuf, + alignblks * BD(dev).bd_sectorsize); + if (err) + return (err); + + if (tmpbuf != dest) { + bcopy(tmpbuf + diff, dest, blks * BD(dev).bd_sectorsize); + free(tmpbuf); + } + return (0); + } +#endif /* LOADER_GELI_SUPPORT */ + + return (bd_io(dev, dblk, blks, dest, 0)); +} + +static int +bd_write(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest) +{ + + return (bd_io(dev, dblk, blks, dest, 1)); +} + +/* + * Return the BIOS geometry of a given "fixed drive" in a format + * suitable for the legacy bootinfo structure. Since the kernel is + * expecting raw int 0x13/0x8 values for N_BIOS_GEOM drives, we + * prefer to get the information directly, rather than rely on being + * able to put it together from information already maintained for + * different purposes and for a probably different number of drives. + * + * For valid drives, the geometry is expected in the format (31..0) + * "000000cc cccccccc hhhhhhhh 00ssssss"; and invalid drives are + * indicated by returning the geometry of a "1.2M" PC-format floppy + * disk. And, incidentally, what is returned is not the geometry as + * such but the highest valid cylinder, head, and sector numbers. + */ +u_int32_t +bd_getbigeom(int bunit) +{ + + v86.ctl = V86_FLAGS; + v86.addr = 0x13; + v86.eax = 0x800; + v86.edx = 0x80 + bunit; + v86int(); + if (V86_CY(v86.efl)) + return 0x4f010f; + return ((v86.ecx & 0xc0) << 18) | ((v86.ecx & 0xff00) << 8) | + (v86.edx & 0xff00) | (v86.ecx & 0x3f); +} + +/* + * Return a suitable dev_t value for (dev). + * + * In the case where it looks like (dev) is a SCSI disk, we allow the number of + * IDE disks to be specified in $num_ide_disks. There should be a Better Way. + */ +int +bd_getdev(struct i386_devdesc *d) +{ + struct disk_devdesc *dev; + int biosdev; + int major; + int rootdev; + char *nip, *cp; + int i, unit; + + dev = (struct disk_devdesc *)d; + biosdev = bd_unit2bios(dev->d_unit); + DEBUG("unit %d BIOS device %d", dev->d_unit, biosdev); + if (biosdev == -1) /* not a BIOS device */ + return(-1); + if (disk_open(dev, BD(dev).bd_sectors * BD(dev).bd_sectorsize, + BD(dev).bd_sectorsize) != 0) /* oops, not a viable device */ + return (-1); + else + disk_close(dev); + + if (biosdev < 0x80) { + /* floppy (or emulated floppy) or ATAPI device */ + if (bdinfo[dev->d_unit].bd_type == DT_ATAPI) { + /* is an ATAPI disk */ + major = WFDMAJOR; + } else { + /* is a floppy disk */ + major = FDMAJOR; + } + } else { + /* assume an IDE disk */ + major = WDMAJOR; + } + /* default root disk unit number */ + unit = biosdev & 0x7f; + + /* XXX a better kludge to set the root disk unit number */ + if ((nip = getenv("root_disk_unit")) != NULL) { + i = strtol(nip, &cp, 0); + /* check for parse error */ + if ((cp != nip) && (*cp == 0)) + unit = i; + } + + rootdev = MAKEBOOTDEV(major, dev->d_slice + 1, unit, dev->d_partition); + DEBUG("dev is 0x%x\n", rootdev); + return(rootdev); +} + +#ifdef LOADER_GELI_SUPPORT +int +bios_read(void *vdev __unused, struct dsk *priv, off_t off, char *buf, size_t bytes) +{ + struct disk_devdesc dev; + + dev.d_dev = &biosdisk; + dev.d_type = priv->type; + dev.d_unit = priv->unit; + dev.d_slice = priv->slice; + dev.d_partition = priv->part; + dev.d_offset = priv->start; + + off = off / BD(&dev).bd_sectorsize; + /* GELI gives us the offset relative to the partition start */ + off += dev.d_offset; + bytes = bytes / BD(&dev).bd_sectorsize; + + return (bd_io(&dev, off, bytes, buf, 0)); +} +#endif /* LOADER_GELI_SUPPORT */ |
