hdfd_intr.s revision 1.3
1 /* $NetBSD: hdfd_intr.s,v 1.3 1996/12/18 12:35:36 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 #define ASSEMBLER /* XXX */ 42 #include <atari/dev/hdfdreg.h> 43 44 .globl _fddmaaddr 45 .globl _fdio_addr,_fddmalen 46 .globl _mfp_hdfd_nf, _mfp_hdfd_fifo 47 48 /* 49 * Entry point when there is no fifo. Handles the read/write 50 * interrupts a bit faster because it *knows* that there is only 51 * one character waiting. 52 */ 53 _mfp_hdfd_nf: 54 addql #1,_intrcnt+12 | XXX: add another fdc/acsi interrupt 55 56 moveml d0-d1/a0-a1,sp@- | Save scratch registers 57 movl _fdio_addr,a0 | Get base of fdc registers 58 movb a0@(fdsts),d0 | Get fdsts 59 btst #5,d0 | Dma active? 60 jeq hdfdc_norm | No, normal interrupt 61 tstl _fddmalen | Bytecount zero? 62 jeq hdfdc_norm | Yes -> normal interrupt 63 64 movl _fddmaaddr, a1 | a1 = dmabuffer 65 btst #6,d0 | Read? 66 jeq hdfd_wrt_nf | No, write 67 hdfd_rd_nf: 68 movb a0@(fddata),a1@+ | Get a byte 69 1: 70 subql #1, _fddmalen | decrement bytecount 71 movl a1,_fddmaaddr | update dma pointer 72 addql #1,_cnt+V_INTR | chalk up another interrupt 73 moveml sp@+,d0-d1/a0-a1 74 rte 75 hdfd_wrt_nf: 76 movb a1@+,a0@(fddata) | Push a byte 77 jra 1b | And get out... 78 79 /* 80 * Systems *with* fifo's enter here. 81 */ 82 _mfp_hdfd_fifo: 83 addql #1,_intrcnt+12 | XXX: add another fdc/acsi interrupt 84 85 moveml d0-d1/a0-a1,sp@- | Save scratch registers 86 movl _fdio_addr,a0 | Get base of fdc registers 87 movb a0@(fdsts),d0 | Get fdsts 88 btst #5,d0 | Dma active? 89 jeq hdfdc_norm | No, normal interrupt 90 movl _fddmaaddr, a1 | a1 = dmabuffer 91 btst #6,d0 | Read? 92 jeq hdfd_wrt | No, write 93 94 hdfd_rd: 95 tstl _fddmalen | Bytecount zero? 96 jeq hdfdc1 | Yes -> done 97 movb a0@(fddata),a1@+ | Get a byte 98 subql #1, _fddmalen | decrement bytecount 99 movb a0@(fdsts),d0 | Get fdsts 100 andb #0xa0,d0 | both NE7_NDM and NE7_RQM active? 101 cmpb #0xa0,d0 102 jne hdfdc1 | No, end of this batch 103 jra hdfd_rd 104 105 hdfd_wrt: 106 tstl _fddmalen | Bytecount zero? 107 jeq hdfdc1 | Yes -> done 108 movb a1@+,a0@(fddata) | Push a byte 109 subql #1, _fddmalen | decrement bytecount 110 jra hdfdc1 111 movb a0@(fdsts),d0 | Get fdsts 112 andb #0xa0,d0 | both NE7_NDM and NE7_RQM active? 113 cmpb #0xa0,d0 114 jne hdfdc1 | No, end of this batch 115 jra hdfd_wrt 116 117 hdfdc1: 118 movl a1,_fddmaaddr | update buffer pointer 119 btst #5,d0 | Dma still active? 120 jeq hdfdc_norm | No -> take normal interrupt 121 122 /* 123 * Exit for read/write interrupts. Calling 'rei' this often 124 * seems wrong.... 125 */ 126 hdfdc_xit: 127 addql #1,_cnt+V_INTR | chalk up another interrupt 128 moveml sp@+,d0-d1/a0-a1 129 rte 130 131 /* 132 * No (more) data transfer interrupts. Do the normal 133 * stuff. 134 */ 135 hdfdc_norm: 136 jbsr _fdc_ctrl_intr | handle interrupt 137 moveml sp@+,d0-d1/a0-a1 | and saved registers 138 addql #1,_cnt+V_INTR | chalk up another interrupt 139 jra rei 140
Indexes created Sat Oct 11 08:10:02 GMT 2025