133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/* $NetBSD: dev_disk.c,v 1.1.1.1 1995/06/01 20:38:07 gwr Exp $ */
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/*
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* Copyright (c) 1993 Paul Kranenburg
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This module implements a "raw device" interface suitable for
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* use by the stand-alone I/O library UFS file-system code, and
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* possibly for direct access (i.e. boot from tape).
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*
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* The implementation is deceptively simple because it uses the
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* drivers provided by the Sun PROM monitor. Note that only the
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* PROM driver used to load the boot program is available here.
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*/
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#include <sys/types.h>
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#include <machine/mon.h>
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#include <machine/saio.h>
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#include "stand.h"
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#include "dvma.h"
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#include "promdev.h"
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int
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disk_open(f, devname)
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struct open_file *f;
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char *devname; /* Device part of file name (or NULL). */
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{
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struct saioreq *sip;
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int error;
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#ifdef DEBUG_PROM
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printf("disk_open: %s\n", devname);
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#endif
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if ((error = prom_iopen(&sip)) != 0)
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return (error);
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f->f_devdata = sip;
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return 0;
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}
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int
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disk_close(f)
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struct open_file *f;
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{
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struct saioreq *sip;
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sip = f->f_devdata;
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prom_iclose(sip);
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f->f_devdata = NULL;
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return 0;
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}
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int
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disk_strategy(devdata, flag, dblk, size, buf, rsize)
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void *devdata;
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int flag;
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daddr_t dblk;
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u_int size;
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char *buf;
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u_int *rsize;
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{
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struct saioreq *si;
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struct boottab *ops;
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char *dmabuf;
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int si_flag, xcnt;
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si = devdata;
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ops = si->si_boottab;
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#ifdef DEBUG_PROM
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printf("disk_strategy: size=%d dblk=%d\n", size, dblk);
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#else
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twiddle();
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#endif
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dmabuf = dvma_mapin(buf, size);
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si->si_bn = dblk;
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si->si_ma = dmabuf;
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si->si_cc = size;
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si_flag = (flag == F_READ) ? SAIO_F_READ : SAIO_F_WRITE;
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xcnt = (*ops->b_strategy)(si, si_flag);
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dvma_mapout(dmabuf, size);
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#ifdef DEBUG_PROM
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printf("disk_strategy: xcnt = %x\n", xcnt);
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#endif
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if (xcnt <= 0)
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return (EIO);
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*rsize = xcnt;
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return (0);
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}
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int
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disk_ioctl()
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{
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return EIO;
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}
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