/*-
* Copyright (c) 2005 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Bang Jun-Young.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1996
* Matthias Drochner. All rights reserved.
* Copyright (c) 1996
* Perry E. Metzger. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgements:
* This product includes software developed for the NetBSD Project
* by Matthias Drochner.
* This product includes software developed for the NetBSD Project
* by Perry E. Metzger.
* 4. The names of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
/*
* shared by bootsector startup (bootsectmain) and biosdisk.c
* needs lowlevel parts from bios_disk.S
*/
/*
* Global shared "diskbuf" is used as read ahead buffer. For reading from
* floppies, the bootstrap has to be loaded on a 64K boundary to ensure that
* this buffer doesn't cross a 64K DMA boundary.
*/
static int ra_dev;
static daddr_t ra_end;
static daddr_t ra_first;
static int
do_read(struct biosdisk_ll *d, daddr_t dblk, int num, char *buf)
{
EFI_STATUS status;
const struct efidiskinfo *edi;
edi = efidisk_getinfo(d->dev);
if (edi == NULL)
return -1;
status = uefi_call_wrapper(edi->bio->ReadBlocks, 5, edi->bio,
edi->media_id, dblk, num * d->secsize, buf);
if (EFI_ERROR(status))
return -1;
return num;
}
/*
* NB if 'cold' is set below not all of the program is loaded, so
* mustn't use data segment, bss, call library functions or do read-ahead.
*/
int
readsects(struct biosdisk_ll *d, daddr_t dblk, int num, char *buf, int cold)
{
while (num) {
int nsec;
/* check for usable data in read-ahead buffer */
if (cold || diskbuf_user != &ra_dev || d->dev != ra_dev
|| dblk < ra_first || dblk >= ra_end) {
/* no, read from disk */
char *trbuf;
int maxsecs;
int retries = BIOSDISK_RETRIES;
if (cold) {
/* transfer directly to buffer */
trbuf = buf;
maxsecs = num;
} else {
/* fill read-ahead buffer */
trbuf = alloc_diskbuf(0); /* no data yet */
maxsecs = DISKBUFSIZE / d->secsize;
}
while ((nsec = do_read(d, dblk, maxsecs, trbuf)) < 0) {
#ifdef DISK_DEBUG
if (!cold)
printf("read error dblk %"PRId64"-%"PRId64"\n",
dblk, (dblk + maxsecs - 1));
#endif
if (--retries >= 0)
continue;
return -1; /* XXX cannot output here if
* (cold) */
}
if (!cold) {
ra_dev = d->dev;
ra_first = dblk;
ra_end = dblk + nsec;
diskbuf_user = &ra_dev;
}
} else /* can take blocks from end of read-ahead
* buffer */
nsec = ra_end - dblk;
if (!cold) {
/* copy data from read-ahead to user buffer */
if (nsec > num)
nsec = num;
memcpy(buf,
diskbufp + (dblk - ra_first) * d->secsize,
nsec * d->secsize);
}
buf += nsec * d->secsize;
num -= nsec;
dblk += nsec;
}
