/* $NetBSD: efidisk_ll.c,v 1.2 2018/03/08 10:34:33 nonaka Exp $ */ /* NetBSD: biosdisk_ll.c,v 1.31 2011/02/21 02:58:02 jakllsch Exp */ /*- * 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 */ #include "efiboot.h" #include "biosdisk_ll.h" #include "diskbuf.h" #include "efidisk.h" static int do_read(struct biosdisk_ll *, daddr_t, int, char *); #ifndef BIOSDISK_RETRIES #define BIOSDISK_RETRIES 5 #endif int set_geometry(struct biosdisk_ll *d, struct biosdisk_extinfo *ed) { const struct efidiskinfo *edi; EFI_BLOCK_IO_MEDIA *media; edi = efidisk_getinfo(d->dev); if (edi == NULL) return 1; media = edi->bio->Media; d->secsize = media->BlockSize; d->type = edi->type; d->flags = BIOSDISK_INT13EXT; if (ed != NULL) { ed->totsec = media->LastBlock + 1; ed->sbytes = media->BlockSize; ed->flags = 0; if (media->RemovableMedia) ed->flags |= EXTINFO_REMOVABLE; } return 0; } /* * 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; } return 0; }
