hdfd_intr.s revision 1.6
1 /* $NetBSD: hdfd_intr.s,v 1.6 1999/03/24 05:50:58 mrg 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 <machine/asm.h> 42 #define ASSEMBLER /* XXX */ 43 #include <atari/dev/hdfdreg.h> 44 45 .text 46 .globl _fddmaaddr 47 .globl _fdio_addr,_fddmalen 48 .globl _mfp_hdfd_nf, _mfp_hdfd_fifo 49 50 /* 51 * Entry point when there is no fifo. Handles the read/write 52 * interrupts a bit faster because it *knows* that there is only 53 * one character waiting. 54 */ 55 _mfp_hdfd_nf: 56 addql #1,nintr | add another interrupt 57 58 moveml d0-d1/a0-a1,sp@- | Save scratch registers 59 movl _fdio_addr,a0 | Get base of fdc registers 60 movb a0@(fdsts),d0 | Get fdsts 61 btst #5,d0 | Dma active? 62 jeq hdfdc_norm | No, normal interrupt 63 tstl _fddmalen | Bytecount zero? 64 jeq hdfdc_norm | Yes -> normal interrupt 65 66 movl _fddmaaddr, a1 | a1 = dmabuffer 67 btst #6,d0 | Read? 68 jeq hdfd_wrt_nf | No, write 69 hdfd_rd_nf: 70 movb a0@(fddata),a1@+ | Get a byte 71 1: 72 subql #1, _fddmalen | decrement bytecount 73 movl a1,_fddmaaddr | update dma pointer 74 | addql #1,_cnt+V_INTR | chalk up another interrupt 75 moveml sp@+,d0-d1/a0-a1 76 rte 77 hdfd_wrt_nf: 78 movb a1@+,a0@(fddata) | Push a byte 79 jra 1b | And get out... 80 81 /* 82 * Systems *with* fifo's enter here. 83 */ 84 _mfp_hdfd_fifo: 85 addql #1,_intrcnt_user+88 | add another interrupt 86 87 moveml d0-d1/a0-a1,sp@- | Save scratch registers 88 movl _fdio_addr,a0 | Get base of fdc registers 89 movb a0@(fdsts),d0 | Get fdsts 90 btst #5,d0 | Dma active? 91 jeq hdfdc_norm | No, normal interrupt 92 movl _fddmaaddr, a1 | a1 = dmabuffer 93 btst #6,d0 | Read? 94 jeq hdfd_wrt | No, write 95 96 hdfd_rd: 97 tstl _fddmalen | Bytecount zero? 98 jeq hdfdc1 | Yes -> done 99 movb a0@(fddata),a1@+ | Get a byte 100 subql #1, _fddmalen | decrement bytecount 101 movb a0@(fdsts),d0 | Get fdsts 102 andb #0xa0,d0 | both NE7_NDM and NE7_RQM active? 103 cmpb #0xa0,d0 104 jne hdfdc1 | No, end of this batch 105 jra hdfd_rd 106 107 hdfd_wrt: 108 tstl _fddmalen | Bytecount zero? 109 jeq hdfdc1 | Yes -> done 110 movb a1@+,a0@(fddata) | Push a byte 111 subql #1, _fddmalen | decrement bytecount 112 jra hdfdc1 113 movb a0@(fdsts),d0 | Get fdsts 114 andb #0xa0,d0 | both NE7_NDM and NE7_RQM active? 115 cmpb #0xa0,d0 116 jne hdfdc1 | No, end of this batch 117 jra hdfd_wrt 118 119 hdfdc1: 120 movl a1,_fddmaaddr | update buffer pointer 121 btst #5,d0 | Dma still active? 122 jeq hdfdc_norm | No -> take normal interrupt 123 124 /* 125 * Exit for read/write interrupts. Calling 'rei' this often 126 * seems wrong.... 127 */ 128 hdfdc_xit: 129 addql #1,_C_LABEL(uvmexp)+UVMEXP_INTRS 130 moveml sp@+,d0-d1/a0-a1 131 rte 132 133 /* 134 * No (more) data transfer interrupts. Do the normal 135 * stuff. 136 */ 137 hdfdc_norm: 138 tstl nintr 139 jeq 0f 140 movl nintr,d0 141 clrl nintr 142 addl d0, _intrcnt_user+88 | add another interrupt 143 addl d0,_C_LABEL(uvmexp)+UVMEXP_INTRS 144 0: jbsr _fdc_ctrl_intr | handle interrupt 145 moveml sp@+,d0-d1/a0-a1 | and saved registers 146 jra rei 147 148 .data 149 nintr: 150 .long 0 151
Indexes created Sat Oct 11 08:10:02 GMT 2025