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1.1 root 1: /*
2: * Copyright (c) 1989, 1990, 1991, 1992 William F. Jolitz, TeleMuse
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This software is a component of "386BSD" developed by
16: William F. Jolitz, TeleMuse.
17: * 4. Neither the name of the developer nor the name "386BSD"
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
22: * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
23: * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
24: * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
25: * NOT MAKE USE THIS WORK.
26: *
27: * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
28: * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
29: * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
30: * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
31: * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
32: * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
33: * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
34: * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
35: *
36: * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
37: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
39: * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
40: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
41: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
42: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
44: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
45: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46: * SUCH DAMAGE.
47: *
1.1.1.3 ! root 48: * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
! 49: * -------------------- ----- ----------------------
! 50: * CURRENT PATCH LEVEL: 2 00065
! 51: * -------------------- ----- ----------------------
! 52: *
! 53: * 09 Sep 92 Paul Kranenburg Fixed read from /dev/drum
! 54: * 28 Nov 92 Mark Tinguely Fixed small leak in physio()
1.1 root 55: */
1.1.1.3 ! root 56: static char rcsid[] = "$Header: /cvsroot/src/sys/kern/Attic/kern__physio.c,v 1.2 1993/03/21 18:11:14 cgd Exp $";
1.1 root 57:
58: #include "param.h"
59: #include "systm.h"
60: #include "buf.h"
61: #include "conf.h"
62: #include "proc.h"
63: #include "malloc.h"
64: #include "vnode.h"
1.1.1.2 root 65: #include "vm/vm.h"
1.1 root 66: #include "specdev.h"
67:
68: static physio(int (*)(), int, int, int, caddr_t, int *, struct proc *);
69:
70: /*
71: * Driver interface to do "raw" I/O in the address space of a
72: * user process directly for read and write operations..
73: */
74:
75: rawread(dev, uio)
76: dev_t dev; struct uio *uio;
77: {
78: return (uioapply(physio, cdevsw[major(dev)].d_strategy, dev, uio));
79: }
80:
81: rawwrite(dev, uio)
82: dev_t dev; struct uio *uio;
83: {
84: return (uioapply(physio, cdevsw[major(dev)].d_strategy, dev, uio));
85: }
86:
87: static physio(strat, dev, off, rw, base, len, p)
88: int (*strat)();
89: dev_t dev;
90: int rw, off;
91: caddr_t base;
92: int *len;
93: struct proc *p;
94: {
95: register struct buf *bp;
1.1.1.2 root 96: int amttodo = *len, error, amtdone;
97: vm_prot_t ftype;
98: static zero;
99: caddr_t adr;
1.1 root 100:
101: rw = rw == UIO_READ ? B_READ : 0;
102:
103: /* create and build a buffer header for a transfer */
104: bp = (struct buf *)malloc(sizeof(*bp), M_TEMP, M_NOWAIT);
1.1.1.3 ! root 105: bzero((char *)bp, sizeof(*bp)); /* 09 Sep 92*/
1.1 root 106: bp->b_flags = B_BUSY | B_PHYS | rw;
107: bp->b_proc = p;
108: bp->b_dev = dev;
109: bp->b_error = 0;
110: bp->b_blkno = off/DEV_BSIZE;
1.1.1.2 root 111: amtdone = 0;
1.1 root 112:
113: /* iteratively do I/O on as large a chunk as possible */
114: do {
115: bp->b_flags &= ~B_DONE;
116: bp->b_un.b_addr = base;
1.1.1.2 root 117: /* XXX limit */
118: bp->b_bcount = min (256*1024, amttodo);
1.1 root 119:
120: /* first, check if accessible */
1.1.1.3 ! root 121: if (rw == B_READ && !useracc(base, bp->b_bcount, B_WRITE)) {
! 122: free(bp, M_TEMP);
1.1 root 123: return (EFAULT);
1.1.1.3 ! root 124: }
! 125: if (rw == B_WRITE && !useracc(base, bp->b_bcount, B_READ)) {
! 126: free(bp, M_TEMP);
1.1 root 127: return (EFAULT);
1.1.1.3 ! root 128: }
1.1 root 129:
1.1.1.2 root 130: /* update referenced and dirty bits, handle copy objects */
131: if (rw == B_READ)
132: ftype = VM_PROT_READ | VM_PROT_WRITE;
133: else
134: ftype = VM_PROT_READ;
1.1.1.3 ! root 135: /* 09 Sep 92*/ for (adr = (caddr_t)trunc_page(base); adr < base + bp->b_bcount;
1.1.1.2 root 136: adr += NBPG) {
137: vm_fault(&curproc->p_vmspace->vm_map,
138: adr, ftype, FALSE);
139: *(int *) adr += zero;
140: }
141:
1.1 root 142: /* lock in core */
143: vslock (base, bp->b_bcount);
144:
145: /* perform transfer */
146: physstrat(bp, strat, PRIBIO);
147:
148: /* unlock */
149: vsunlock (base, bp->b_bcount, 0);
1.1.1.2 root 150: amtdone = bp->b_bcount - bp->b_resid;
151: amttodo -= amtdone;
152: base += amtdone;
153: bp->b_blkno += amtdone/DEV_BSIZE;
154: } while (amttodo && (bp->b_flags & B_ERROR) == 0 && amtdone > 0);
1.1 root 155:
156: error = bp->b_error;
157: free(bp, M_TEMP);
1.1.1.2 root 158: *len = amttodo;
1.1 root 159: return (error);
160: }
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