hdfd_intr.s revision 1.1
1 /* $NetBSD: hdfd_intr.s,v 1.1 1996/11/09 22:27:26 leo Exp $ 2 3 /* 4 * Copyright (c) 1996 Leo Weppelman. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by Leo Weppelman. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 */ 39 40 #include "assym.h" 41 #include <atari/dev/hdfdreg.h> 42 43 .globl _fddmaaddr 44 .globl _fdio_addr,_fddmalen 45 .globl _mfp_hdfd_nf, _mfp_hdfd_fifo 46 47 /* 48 * Entry point when there is no fifo. Handles the read/write 49 * interrupts a bit faster because it *knows* that there is only 50 * one character waiting. 51 */ 52 _mfp_hdfd_nf: 53 addql #1,_intrcnt+12 | XXX: add another fdc/acsi interrupt 54 55 moveml d0-d1/a0-a1,sp@- | Save scratch registers 56 movl _fdio_addr,a0 | Get base of fdc registers 57 movb a0@(fdsts),d0 | Get fdsts 58 btst #5,d0 | Dma active? 59 jeq hdfdc_norm | No, normal interrupt 60 tstl _fddmalen | Bytecount zero? 61 jeq hdfdc_norm | Yes -> normal interrupt 62 63 movl _fddmaaddr, a1 | a1 = dmabuffer 64 btst #6,d0 | Read? 65 jeq hdfd_wrt_nf | No, write 66 hdfd_rd_nf: 67 movb a0@(fddata),a1@+ | Get a byte 68 1: 69 subql #1, _fddmalen | decrement bytecount 70 movl a1,_fddmaaddr | update dma pointer 71 addql #1,_cnt+V_INTR | chalk up another interrupt 72 moveml sp@+,d0-d1/a0-a1 73 rte 74 hdfd_wrt_nf: 75 movb a1@+,a0@(fddata) | Push a byte 76 jra 1b | And get out... 77 78 /* 79 * Systems *with* fifo's enter here. 80 */ 81 _mfp_hdfd_fifo: 82 addql #1,_intrcnt+12 | XXX: add another fdc/acsi interrupt 83 84 moveml d0-d1/a0-a1,sp@- | Save scratch registers 85 movl _fdio_addr,a0 | Get base of fdc registers 86 movb a0@(fdsts),d0 | Get fdsts 87 btst #5,d0 | Dma active? 88 jeq hdfdc_norm | No, normal interrupt 89 movl _fddmaaddr, a1 | a1 = dmabuffer 90 btst #6,d0 | Read? 91 jeq hdfd_wrt | No, write 92 93 hdfd_rd: 94 tstl _fddmalen | Bytecount zero? 95 jeq hdfdc1 | Yes -> done 96 movb a0@(fddata),a1@+ | Get a byte 97 subql #1, _fddmalen | decrement bytecount 98 movb a0@(fdsts),d0 | Get fdsts 99 andb #0xa0,d0 | both NE7_NDM and NE7_RQM active? 100 cmpb #0xa0,d0 101 jne hdfdc1 | No, end of this batch 102 jra hdfd_rd 103 104 hdfd_wrt: 105 tstl _fddmalen | Bytecount zero? 106 jeq hdfdc1 | Yes -> done 107 movb a1@+,a0@(fddata) | Push a byte 108 subql #1, _fddmalen | decrement bytecount 109 jra hdfdc1 110 movb a0@(fdsts),d0 | Get fdsts 111 andb #0xa0,d0 | both NE7_NDM and NE7_RQM active? 112 cmpb #0xa0,d0 113 jne hdfdc1 | No, end of this batch 114 jra hdfd_wrt 115 116 hdfdc1: 117 movl a1,_fddmaaddr | update buffer pointer 118 btst #5,d0 | Dma still active? 119 jeq hdfdc_norm | No -> take normal interrupt 120 121 /* 122 * Exit for read/write interrupts. Calling 'rei' this often 123 * seems wrong.... 124 */ 125 hdfdc_xit: 126 addql #1,_cnt+V_INTR | chalk up another interrupt 127 moveml sp@+,d0-d1/a0-a1 128 rte 129 130 /* 131 * No (more) data transfer interrupts. Do the normal 132 * stuff. 133 */ 134 hdfdc_norm: 135 lea sp@(16),a0 | push pointer to trap-frame 136 movl a0,sp@- 137 jbsr _fdc_ctrl_intr | handle interrupt 138 addql #4,sp | pop trap-frame pointer 139 moveml sp@+,d0-d1/a0-a1 | and saved registers 140 addql #1,_cnt+V_INTR | chalk up another interrupt 141 jra rei 142
Indexes created Sat Oct 11 08:10:02 GMT 2025