| 1 | /* op50n-io.S -- low-level I/O routines for the Oki OP50N eval board. |
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| 2 | * |
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| 3 | * Copyright (c) 1995 Cygnus Support |
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| 4 | * |
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| 5 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 6 | * and license this software and its documentation for any purpose, provided |
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| 7 | * that existing copyright notices are retained in all copies and that this |
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| 8 | * notice is included verbatim in any distributions. No written agreement, |
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| 9 | * license, or royalty fee is required for any of the authorized uses. |
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| 10 | * Modifications to this software may be copyrighted by their authors |
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| 11 | * and need not follow the licensing terms described here, provided that |
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| 12 | * the new terms are clearly indicated on the first page of each file where |
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| 13 | * they apply. |
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| 14 | */ |
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| 15 | |
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| 16 | mon_start .EQU 0xd0000000 |
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| 17 | where_dp .EQU mon_start+4*4 |
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| 18 | where_ci .EQU mon_start+14*4 |
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| 19 | where_co .EQU mon_start+15*4 |
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| 20 | where_read .EQU mon_start+22*4 |
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| 21 | where_write .EQU mon_start+23*4 |
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| 22 | |
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| 23 | /* |
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| 24 | *int c = inbyte(wait); |
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| 25 | */ |
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| 26 | .space $TEXT$ |
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| 27 | .align 4 |
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| 28 | .EXPORT inbyte,CODE,ARGW0=GR,RTNVAL=GR |
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| 29 | inbyte |
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| 30 | .PROC |
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| 31 | .CALLINFO CALLER,FRAME=64,SAVE_RP |
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| 32 | .ENTRY |
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| 33 | stw %r2,-20(0,%r30) |
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| 34 | ldo 64(%r30),%r30 |
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| 35 | stw %r27,-56(0,%r30) ; save my dp |
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| 36 | ldil l%where_dp,%r27 ; load monitors dp |
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| 37 | ldw r%where_dp(0,%r27),%r27 |
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| 38 | ldil l%where_ci,%r1 |
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| 39 | ldw r%where_ci(0,%r1),%r1 |
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| 40 | ble 0(0,%r1) |
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| 41 | copy %r31,%r2 |
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| 42 | ldw -56(0,%r30),%r27 ; load my dp |
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| 43 | ldw -84(0,%r30),%r2 |
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| 44 | ldo -64(%r30),%r30 |
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| 45 | bv %r0(%r2) |
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| 46 | nop |
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| 47 | .EXIT |
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| 48 | .PROCEND |
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| 49 | |
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| 50 | /* int c = outbyte(c); |
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| 51 | */ |
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| 52 | .EXPORT outbyte,CODE,ARGW0=GR,RTNVAL=GR |
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| 53 | outbyte |
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| 54 | .PROC |
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| 55 | .CALLINFO CALLER,FRAME=64,SAVE_RP |
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| 56 | .ENTRY |
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| 57 | stw %r2,-20(0,%r30) |
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| 58 | ldo 64(%r30),%r30 |
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| 59 | stw %r27,-56(0,%r30) ; save my dp |
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| 60 | ldil l%where_dp,%r27 ; load monitors dp |
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| 61 | ldw r%where_dp(0,%r27),%r27 |
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| 62 | ldil l%where_co,%r1 |
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| 63 | ldw r%where_co(0,%r1),%r1 |
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| 64 | ble 0(0,%r1) |
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| 65 | copy %r31,%r2 |
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| 66 | ldw -56(0,%r30),%r27 ; load my dp |
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| 67 | ldw -84(0,%r30),%r2 |
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| 68 | ldo -64(%r30),%r30 |
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| 69 | bv %r0(%r2) |
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| 70 | nop |
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| 71 | .EXIT |
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| 72 | .PROCEND |
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| 73 | |
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| 74 | #if 0 |
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| 75 | /* cnt = read(fd, bufp, cnt); |
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| 76 | */ |
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| 77 | .EXPORT read,CODE,ARGW0=NO,ARGW1=NO,ARGW2=NO,ARGW3=NO,RTNVAL=NO |
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| 78 | read |
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| 79 | .PROC |
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| 80 | .CALLINFO FRAME=64,CALLS,SAVE_RP |
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| 81 | .ENTRY |
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| 82 | stw %r2,-20(0,%r30) |
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| 83 | ldo 64(%r30),%r30 |
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| 84 | stw %dp,-56(0,%r30) ; save my dp |
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| 85 | ldil l%where_dp,%dp ; load monitors dp |
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| 86 | ldw r%where_dp(0,%dp), %dp |
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| 87 | ldil l%where_read,%r1 |
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| 88 | ldw r%where_read(0,%r1), %r1 |
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| 89 | ble 0(0,%r1) |
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| 90 | copy %r31,%r2 |
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| 91 | ldw -56(0,%r30),%dp ; load my dp |
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| 92 | ldw -84(0,%r30),%r2 |
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| 93 | bv %r0(%r2) |
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| 94 | ldo -64(%r30),%r30 |
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| 95 | .EXIT |
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| 96 | .PROCEND |
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| 97 | |
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| 98 | /* cnt = write(fd, bufp, cnt); |
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| 99 | */ |
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| 100 | .EXPORT write,CODE,ARGW0=NO,ARGW1=NO,ARGW2=NO,ARGW3=NO,RTNVAL=NO |
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| 101 | write |
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| 102 | .PROC |
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| 103 | .CALLINFO FRAME=64,CALLS,SAVE_RP |
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| 104 | .ENTRY |
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| 105 | stw %r2,-20(0,%r30) |
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| 106 | ldo 64(%r30),%r30 |
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| 107 | stw %dp,-56(0,%r30) ; save my dp |
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| 108 | ldil l%where_dp,%dp ; load monitors dp |
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| 109 | ldw r%where_dp(0,%dp), %dp |
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| 110 | ldil l%where_write,%r1 |
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| 111 | ldw r%where_write(0,%r1), %r1 |
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| 112 | ble 0(0,%r1) |
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| 113 | copy %r31,%r2 |
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| 114 | ldw -56(0,%r30),%dp ; load my dp |
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| 115 | ldw -84(0,%r30),%r2 |
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| 116 | bv %r0(%r2) |
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| 117 | ldo -64(%r30),%r30 |
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| 118 | .EXIT |
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| 119 | .PROCEND |
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| 120 | #endif |
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