1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)conf.c 7.2 (Berkeley) 04/28/91 11 */ 12 13 #include "param.h" 14 15 #include "saio.h" 16 #ifdef BOOT 17 extern exception; 18 extern int debugflag; 19 #endif 20 21 devread(io) 22 register struct iob *io; 23 { 24 int cc; 25 char c; 26 27 io->i_flgs |= F_RDDATA; 28 io->i_error = 0; 29 cc = (*devsw[io->i_dev].dv_strategy)(io, READ); 30 io->i_flgs &= ~F_TYPEMASK; 31 32 #ifdef BOOT 33 if(/*io->i_error || */(c=scankbd())) 34 _longjmp(&exception,1); 35 #endif 36 return (cc); 37 } 38 39 devwrite(io) 40 register struct iob *io; 41 { 42 int cc; 43 char c; 44 45 io->i_flgs |= F_WRDATA; 46 io->i_error = 0; 47 cc = (*devsw[io->i_dev].dv_strategy)(io, WRITE); 48 io->i_flgs &= ~F_TYPEMASK; 49 #ifdef BOOT 50 if(/* io->i_error || */ (c=scankbd())) 51 _longjmp(&exception,1); 52 #endif 53 return (cc); 54 } 55 56 devopen(io) 57 register struct iob *io; 58 { 59 60 (*devsw[io->i_dev].dv_open)(io); 61 } 62 63 devclose(io) 64 register struct iob *io; 65 { 66 67 (*devsw[io->i_dev].dv_close)(io); 68 } 69 70 devioctl(io, cmd, arg) 71 register struct iob *io; 72 int cmd; 73 caddr_t arg; 74 { 75 76 return ((*devsw[io->i_dev].dv_ioctl)(io, cmd, arg)); 77 } 78 79 /*ARGSUSED*/ 80 nullsys(io) 81 struct iob *io; 82 { 83 84 ; 85 } 86 87 /*ARGSUSED*/ 88 nullioctl(io, cmd, arg) 89 struct iob *io; 90 int cmd; 91 caddr_t arg; 92 { 93 94 return (ECMD); 95 } 96 97 int nullsys(), nullioctl(); 98 int wdstrategy(), wdopen()/*, wdioctl()*/; 99 int fdstrategy(), fdopen()/*, fdioctl()*/; 100 101 struct devsw devsw[] = { 102 /*{ "xx", xxstrategy, xxopen, nullsys, nullioctl },*/ 103 { "wd", wdstrategy, wdopen, nullsys,/*wdioctl*/ nullioctl }, 104 { "", 0, 0, 0, 0 }, /* swapdev place holder */ 105 { "fd", fdstrategy, fdopen, nullsys,/*fdioctl*/ nullioctl }, 106 { 0, 0, 0, 0, 0 }, 107 }; 108 int ndevs = 3 ; 109