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15637ed4 RG |
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 | * | |
fde1aeb2 | 48 | * $Id: kern__physio.c,v 1.4 1993/11/25 01:32:47 wollman Exp $ |
15637ed4 | 49 | */ |
15637ed4 RG |
50 | |
51 | #include "param.h" | |
52 | #include "systm.h" | |
53 | #include "buf.h" | |
54 | #include "conf.h" | |
55 | #include "proc.h" | |
56 | #include "malloc.h" | |
57 | #include "vnode.h" | |
58 | #include "vm/vm.h" | |
59 | #include "specdev.h" | |
60 | ||
15637ed4 RG |
61 | /* |
62 | * Driver interface to do "raw" I/O in the address space of a | |
63 | * user process directly for read and write operations.. | |
64 | */ | |
65 | ||
4c45483e | 66 | int |
15637ed4 | 67 | rawread(dev, uio) |
fde1aeb2 GW |
68 | dev_t dev; |
69 | struct uio *uio; | |
15637ed4 | 70 | { |
fde1aeb2 GW |
71 | return (uioapply(physio, |
72 | (caddr_t)cdevsw[major(dev)].d_strategy, | |
73 | (caddr_t)(u_long)dev, uio)); | |
15637ed4 RG |
74 | } |
75 | ||
4c45483e | 76 | int |
15637ed4 | 77 | rawwrite(dev, uio) |
fde1aeb2 GW |
78 | dev_t dev; |
79 | struct uio *uio; | |
15637ed4 | 80 | { |
fde1aeb2 GW |
81 | return (uioapply(physio, |
82 | (caddr_t)cdevsw[major(dev)].d_strategy, | |
83 | (caddr_t)(u_long)dev, uio)); | |
15637ed4 RG |
84 | } |
85 | ||
fde1aeb2 GW |
86 | int |
87 | physio(strat, dev, bp, off, rw, base, len, p) | |
88 | d_strategy_t *strat; | |
15637ed4 | 89 | dev_t dev; |
519fb2b7 | 90 | struct buf *bp; |
15637ed4 RG |
91 | int rw, off; |
92 | caddr_t base; | |
93 | int *len; | |
94 | struct proc *p; | |
95 | { | |
15637ed4 RG |
96 | int amttodo = *len, error, amtdone; |
97 | vm_prot_t ftype; | |
98 | static zero; | |
99 | caddr_t adr; | |
519fb2b7 | 100 | int bp_alloc = (bp == 0); |
15637ed4 RG |
101 | |
102 | rw = rw == UIO_READ ? B_READ : 0; | |
103 | ||
104 | /* create and build a buffer header for a transfer */ | |
519fb2b7 RG |
105 | |
106 | if (bp_alloc) { | |
107 | bp = (struct buf *)malloc(sizeof(*bp), M_TEMP, M_NOWAIT); | |
108 | bzero((char *)bp, sizeof(*bp)); /* 09 Sep 92*/ | |
109 | } | |
15637ed4 RG |
110 | bp->b_flags = B_BUSY | B_PHYS | rw; |
111 | bp->b_proc = p; | |
112 | bp->b_dev = dev; | |
113 | bp->b_error = 0; | |
114 | bp->b_blkno = off/DEV_BSIZE; | |
115 | amtdone = 0; | |
116 | ||
117 | /* iteratively do I/O on as large a chunk as possible */ | |
118 | do { | |
119 | bp->b_flags &= ~B_DONE; | |
120 | bp->b_un.b_addr = base; | |
121 | /* XXX limit */ | |
122 | bp->b_bcount = min (256*1024, amttodo); | |
123 | ||
124 | /* first, check if accessible */ | |
125 | if (rw == B_READ && !useracc(base, bp->b_bcount, B_WRITE)) { | |
519fb2b7 RG |
126 | if (bp_alloc) |
127 | free(bp, M_TEMP); | |
15637ed4 RG |
128 | return (EFAULT); |
129 | } | |
130 | if (rw == B_WRITE && !useracc(base, bp->b_bcount, B_READ)) { | |
519fb2b7 RG |
131 | if (bp_alloc) |
132 | free(bp, M_TEMP); | |
15637ed4 RG |
133 | return (EFAULT); |
134 | } | |
135 | ||
136 | /* update referenced and dirty bits, handle copy objects */ | |
137 | if (rw == B_READ) | |
138 | ftype = VM_PROT_READ | VM_PROT_WRITE; | |
139 | else | |
140 | ftype = VM_PROT_READ; | |
141 | /* 09 Sep 92*/ for (adr = (caddr_t)trunc_page(base); adr < base + bp->b_bcount; | |
142 | adr += NBPG) { | |
143 | vm_fault(&curproc->p_vmspace->vm_map, | |
fde1aeb2 | 144 | (vm_offset_t)adr, ftype, FALSE); |
15637ed4 RG |
145 | *(int *) adr += zero; |
146 | } | |
147 | ||
148 | /* lock in core */ | |
149 | vslock (base, bp->b_bcount); | |
150 | ||
151 | /* perform transfer */ | |
152 | physstrat(bp, strat, PRIBIO); | |
153 | ||
154 | /* unlock */ | |
155 | vsunlock (base, bp->b_bcount, 0); | |
156 | amtdone = bp->b_bcount - bp->b_resid; | |
157 | amttodo -= amtdone; | |
158 | base += amtdone; | |
159 | bp->b_blkno += amtdone/DEV_BSIZE; | |
160 | } while (amttodo && (bp->b_flags & B_ERROR) == 0 && amtdone > 0); | |
161 | ||
162 | error = bp->b_error; | |
519fb2b7 RG |
163 | if (bp_alloc) |
164 | free(bp, M_TEMP); | |
15637ed4 RG |
165 | *len = amttodo; |
166 | return (error); | |
167 | } |