154 lines
4.9 KiB
C
154 lines
4.9 KiB
C
/*
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* Copyright (c) 1989, 1990, 1991, 1992 William F. Jolitz, TeleMuse
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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 software is a component of "386BSD" developed by
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William F. Jolitz, TeleMuse.
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* 4. Neither the name of the developer nor the name "386BSD"
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
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* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
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* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
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* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
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* NOT MAKE USE THIS WORK.
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*
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* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
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* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
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* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
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* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
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* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
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* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
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* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
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* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: kern__physio.c,v 1.3 1993/05/20 02:54:15 cgd Exp $
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*/
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#include "param.h"
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#include "systm.h"
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#include "buf.h"
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#include "conf.h"
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#include "proc.h"
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#include "malloc.h"
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#include "vnode.h"
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#include "vm/vm.h"
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#include "specdev.h"
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static physio(int (*)(), int, int, int, caddr_t, int *, struct proc *);
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/*
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* Driver interface to do "raw" I/O in the address space of a
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* user process directly for read and write operations..
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*/
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rawread(dev, uio)
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dev_t dev; struct uio *uio;
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{
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return (uioapply(physio, cdevsw[major(dev)].d_strategy, dev, uio));
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}
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rawwrite(dev, uio)
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dev_t dev; struct uio *uio;
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{
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return (uioapply(physio, cdevsw[major(dev)].d_strategy, dev, uio));
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}
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static physio(strat, dev, off, rw, base, len, p)
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int (*strat)();
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dev_t dev;
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int rw, off;
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caddr_t base;
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int *len;
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struct proc *p;
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{
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register struct buf *bp;
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int amttodo = *len, error, amtdone;
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vm_prot_t ftype;
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static zero;
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caddr_t adr;
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rw = rw == UIO_READ ? B_READ : 0;
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/* create and build a buffer header for a transfer */
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bp = (struct buf *)malloc(sizeof(*bp), M_TEMP, M_NOWAIT);
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bzero((char *)bp, sizeof(*bp)); /* 09 Sep 92*/
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bp->b_flags = B_BUSY | B_PHYS | rw;
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bp->b_proc = p;
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bp->b_dev = dev;
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bp->b_error = 0;
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bp->b_blkno = off/DEV_BSIZE;
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amtdone = 0;
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/* iteratively do I/O on as large a chunk as possible */
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do {
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bp->b_flags &= ~B_DONE;
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bp->b_un.b_addr = base;
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/* XXX limit */
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bp->b_bcount = min (256*1024, amttodo);
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/* first, check if accessible */
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if (rw == B_READ && !useracc(base, bp->b_bcount, B_WRITE)) {
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free(bp, M_TEMP);
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return (EFAULT);
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}
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if (rw == B_WRITE && !useracc(base, bp->b_bcount, B_READ)) {
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free(bp, M_TEMP);
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return (EFAULT);
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}
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/* update referenced and dirty bits, handle copy objects */
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if (rw == B_READ)
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ftype = VM_PROT_READ | VM_PROT_WRITE;
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else
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ftype = VM_PROT_READ;
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/* 09 Sep 92*/ for (adr = (caddr_t)trunc_page(base); adr < base + bp->b_bcount;
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adr += NBPG) {
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vm_fault(&curproc->p_vmspace->vm_map,
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adr, ftype, FALSE);
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*(int *) adr += zero;
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}
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/* lock in core */
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vslock (base, bp->b_bcount);
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/* perform transfer */
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physstrat(bp, strat, PRIBIO);
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/* unlock */
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vsunlock (base, bp->b_bcount, 0);
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amtdone = bp->b_bcount - bp->b_resid;
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amttodo -= amtdone;
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base += amtdone;
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bp->b_blkno += amtdone/DEV_BSIZE;
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} while (amttodo && (bp->b_flags & B_ERROR) == 0 && amtdone > 0);
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error = bp->b_error;
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free(bp, M_TEMP);
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*len = amttodo;
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return (error);
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}
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