diff options
Diffstat (limited to 'sys/boot/pc98/libpc98/bioscd.c')
-rw-r--r-- | sys/boot/pc98/libpc98/bioscd.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/sys/boot/pc98/libpc98/bioscd.c b/sys/boot/pc98/libpc98/bioscd.c new file mode 100644 index 0000000..1b8d432 --- /dev/null +++ b/sys/boot/pc98/libpc98/bioscd.c @@ -0,0 +1,344 @@ +/*- + * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> + * Copyright (c) 2001 John H. Baldwin <jhb@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 CD device handling for CD's that have been booted off of via no + * emulation booting as defined in the El Torito standard. + * + * Ideas and algorithms from: + * + * - FreeBSD libi386/biosdisk.c + * + */ + +#include <stand.h> + +#include <sys/param.h> +#include <machine/bootinfo.h> +#include <machine/psl.h> + +#include <stdarg.h> + +#include <bootstrap.h> +#include <btxv86.h> +#include "libi386.h" + +#define BIOSCD_SECSIZE 2048 +#define BUFSIZE (1 * BIOSCD_SECSIZE) +#define MAXBCDEV 1 + +/* Major numbers for devices we frontend for. */ +#define ACDMAJOR 117 +#define CDMAJOR 15 + +#ifdef DISK_DEBUG +# define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args) +#else +# define DEBUG(fmt, args...) +#endif + +struct specification_packet { + u_char sp_size; + u_char sp_bootmedia; + u_char sp_drive; + u_char sp_controller; + u_int sp_lba; + u_short sp_devicespec; + u_short sp_buffersegment; + u_short sp_loadsegment; + u_short sp_sectorcount; + u_short sp_cylsec; + u_char sp_head; +}; + +/* + * List of BIOS devices, translation from disk unit number to + * BIOS unit number. + */ +static struct bcinfo { + int bc_unit; /* BIOS unit number */ + struct specification_packet bc_sp; +} bcinfo [MAXBCDEV]; +static int nbcinfo = 0; + +static int bc_read(int unit, daddr_t dblk, int blks, caddr_t dest); +static int bc_init(void); +static int bc_strategy(void *devdata, int flag, daddr_t dblk, + size_t size, char *buf, size_t *rsize); +static int bc_open(struct open_file *f, ...); +static int bc_close(struct open_file *f); +static void bc_print(int verbose); + +struct devsw bioscd = { + "cd", + DEVT_CD, + bc_init, + bc_strategy, + bc_open, + bc_close, + noioctl, + bc_print, + NULL +}; + +/* + * Translate between BIOS device numbers and our private unit numbers. + */ +int +bc_bios2unit(int biosdev) +{ + int i; + + DEBUG("looking for bios device 0x%x", biosdev); + for (i = 0; i < nbcinfo; i++) { + DEBUG("bc unit %d is BIOS device 0x%x", i, bcinfo[i].bc_unit); + if (bcinfo[i].bc_unit == biosdev) + return(i); + } + return(-1); +} + +int +bc_unit2bios(int unit) +{ + if ((unit >= 0) && (unit < nbcinfo)) + return(bcinfo[unit].bc_unit); + return(-1); +} + +/* + * We can't quiz, we have to be told what device to use, so this functoin + * doesn't do anything. Instead, the loader calls bc_add() with the BIOS + * device number to add. + */ +static int +bc_init(void) +{ + + return (0); +} + +int +bc_add(int biosdev) +{ + + if (nbcinfo >= MAXBCDEV) + return (-1); + bcinfo[nbcinfo].bc_unit = biosdev; + + /* SCSI CD-ROM only */ + if ((biosdev & 0xf0) != 0xa0) + return (-1); + if ((((uint32_t *)PTOV(0xA1460))[biosdev & 0x0f] & 0x1f) != 5) + return (-1); + + printf("BIOS CD is cd%d\n", nbcinfo); + nbcinfo++; + return(0); +} + +/* + * Print information about disks + */ +static void +bc_print(int verbose) +{ + int i; + char line[80]; + + for (i = 0; i < nbcinfo; i++) { + sprintf(line, " cd%d: Device 0x%x\n", i, + bcinfo[i].bc_sp.sp_devicespec); + pager_output(line); + } +} + +/* + * Attempt to open the disk described by (dev) for use by (f). + */ +static int +bc_open(struct open_file *f, ...) +{ + va_list ap; + struct i386_devdesc *dev; + + va_start(ap, f); + dev = va_arg(ap, struct i386_devdesc *); + va_end(ap); + if (dev->d_kind.bioscd.unit >= nbcinfo) { + DEBUG("attempt to open nonexistent disk"); + return(ENXIO); + } + + return(0); +} + +static int +bc_close(struct open_file *f) +{ + + return(0); +} + +static int +bc_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, + size_t *rsize) +{ + struct i386_devdesc *dev; + int unit; + int blks; +#ifdef BD_SUPPORT_FRAGS + char fragbuf[BIOSCD_SECSIZE]; + size_t fragsize; + + fragsize = size % BIOSCD_SECSIZE; +#else + if (size % BIOSCD_SECSIZE) + return (EINVAL); +#endif + + if (rw != F_READ) + return(EROFS); + dev = (struct i386_devdesc *)devdata; + unit = dev->d_kind.bioscd.unit; + blks = size / BIOSCD_SECSIZE; + if (dblk % (BIOSCD_SECSIZE / DEV_BSIZE) != 0) + return (EINVAL); + dblk /= (BIOSCD_SECSIZE / DEV_BSIZE); + DEBUG("read %d from %d to %p", blks, dblk, buf); + + if (rsize) + *rsize = 0; + if (blks && bc_read(unit, dblk, blks, buf)) { + DEBUG("read error"); + return (EIO); + } +#ifdef BD_SUPPORT_FRAGS + DEBUG("bc_strategy: frag read %d from %d+%d to %p", + fragsize, dblk, blks, buf + (blks * BIOSCD_SECSIZE)); + if (fragsize && bc_read(unit, dblk + blks, 1, fragsize)) { + DEBUG("frag read error"); + return(EIO); + } + bcopy(fragbuf, buf + (blks * BIOSCD_SECSIZE), fragsize); +#endif + if (rsize) + *rsize = size; + return (0); +} + +static int +bc_read(int unit, daddr_t dblk, int blks, caddr_t dest) +{ + u_int result, retry; + static unsigned short packet[8]; + int biosdev; +#ifdef DISK_DEBUG + int error; +#endif + + /* Just in case some idiot actually tries to read -1 blocks... */ + if (blks < 0) + return (-1); + + /* If nothing to do, just return succcess. */ + if (blks == 0) + return (0); + + biosdev = bc_unit2bios(unit); + /* + * 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 = 0x1b; + v86.eax = 0x0300 | biosdev; + v86int(); + } + + v86.ctl = V86_FLAGS; + v86.addr = 0x1b; + v86.eax = 0x0600 | (biosdev & 0x7f); + v86.ebx = blks * BIOSCD_SECSIZE; + v86.ecx = dblk & 0xffff; + v86.edx = (dblk >> 16) & 0xffff; + v86.ebp = VTOPOFF(dest); + v86.es = VTOPSEG(dest); + v86int(); + result = (v86.efl & PSL_C); + if (result == 0) + break; + } + +#ifdef DISK_DEBUG + error = (v86.eax >> 8) & 0xff; +#endif + DEBUG("%d sectors from %ld to %p (0x%x) %s", blks, dblk, dest, + VTOP(dest), result ? "failed" : "ok"); + DEBUG("unit %d status 0x%x", unit, error); + +/* hexdump(dest, (blks * BIOSCD_SECSIZE)); */ + return(0); +} + +/* + * Return a suitable dev_t value for (dev). + */ +int +bc_getdev(struct i386_devdesc *dev) +{ + int biosdev, unit, device; + int major; + int rootdev; + + unit = dev->d_kind.bioscd.unit; + biosdev = bc_unit2bios(unit); + DEBUG("unit %d BIOS device %d", unit, biosdev); + if (biosdev == -1) /* not a BIOS device */ + return(-1); + + device = biosdev & 0xf0; + if (device == 0x80) + major = ACDMAJOR; + else if (device == 0xa0) + major = CDMAJOR; + else + return (-1); + + unit = 0; /* XXX */ + + /* XXX: Assume partition 'a'. */ + rootdev = MAKEBOOTDEV(major, 0, 0, unit, 0); + DEBUG("dev is 0x%x\n", rootdev); + return(rootdev); +} |