hdfd_intr.s revision 1.5
1 /* $NetBSD: hdfd_intr.s,v 1.5 1998/05/12 21:09:23 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 "opt_uvm.h" 41 #include "assym.h" 42 #include <machine/asm.h> 43 #define ASSEMBLER /* XXX */ 44 #include <atari/dev/hdfdreg.h> 45 46 .text 47 .globl _fddmaaddr 48 .globl _fdio_addr,_fddmalen 49 .globl _mfp_hdfd_nf, _mfp_hdfd_fifo 50 51 /* 52 * Entry point when there is no fifo. Handles the read/write 53 * interrupts a bit faster because it *knows* that there is only 54 * one character waiting. 55 */ 56 _mfp_hdfd_nf: 57 addql #1,nintr | add another interrupt 58 59 moveml d0-d1/a0-a1,sp@- | Save scratch registers 60 movl _fdio_addr,a0 | Get base of fdc registers 61 movb a0@(fdsts),d0 | Get fdsts 62 btst #5,d0 | Dma active? 63 jeq hdfdc_norm | No, normal interrupt 64 tstl _fddmalen | Bytecount zero? 65 jeq hdfdc_norm | Yes -> normal interrupt 66 67 movl _fddmaaddr, a1 | a1 = dmabuffer 68 btst #6,d0 | Read? 69 jeq hdfd_wrt_nf | No, write 70 hdfd_rd_nf: 71 movb a0@(fddata),a1@+ | Get a byte 72 1: 73 subql #1, _fddmalen | decrement bytecount 74 movl a1,_fddmaaddr | update dma pointer 75 | addql #1,_cnt+V_INTR | chalk up another interrupt 76 moveml sp@+,d0-d1/a0-a1 77 rte 78 hdfd_wrt_nf: 79 movb a1@+,a0@(fddata) | Push a byte 80 jra 1b | And get out... 81 82 /* 83 * Systems *with* fifo's enter here. 84 */ 85 _mfp_hdfd_fifo: 86 addql #1,_intrcnt_user+88 | add another interrupt 87 88 moveml d0-d1/a0-a1,sp@- | Save scratch registers 89 movl _fdio_addr,a0 | Get base of fdc registers 90 movb a0@(fdsts),d0 | Get fdsts 91 btst #5,d0 | Dma active? 92 jeq hdfdc_norm | No, normal interrupt 93 movl _fddmaaddr, a1 | a1 = dmabuffer 94 btst #6,d0 | Read? 95 jeq hdfd_wrt | No, write 96 97 hdfd_rd: 98 tstl _fddmalen | Bytecount zero? 99 jeq hdfdc1 | Yes -> done 100 movb a0@(fddata),a1@+ | Get a byte 101 subql #1, _fddmalen | decrement bytecount 102 movb a0@(fdsts),d0 | Get fdsts 103 andb #0xa0,d0 | both NE7_NDM and NE7_RQM active? 104 cmpb #0xa0,d0 105 jne hdfdc1 | No, end of this batch 106 jra hdfd_rd 107 108 hdfd_wrt: 109 tstl _fddmalen | Bytecount zero? 110 jeq hdfdc1 | Yes -> done 111 movb a1@+,a0@(fddata) | Push a byte 112 subql #1, _fddmalen | decrement bytecount 113 jra hdfdc1 114 movb a0@(fdsts),d0 | Get fdsts 115 andb #0xa0,d0 | both NE7_NDM and NE7_RQM active? 116 cmpb #0xa0,d0 117 jne hdfdc1 | No, end of this batch 118 jra hdfd_wrt 119 120 hdfdc1: 121 movl a1,_fddmaaddr | update buffer pointer 122 btst #5,d0 | Dma still active? 123 jeq hdfdc_norm | No -> take normal interrupt 124 125 /* 126 * Exit for read/write interrupts. Calling 'rei' this often 127 * seems wrong.... 128 */ 129 hdfdc_xit: 130 #if defined(UVM) 131 addql #1,_C_LABEL(uvmexp)+UVMEXP_INTRS 132 #else 133 addql #1,_C_LABEL(cnt)+V_INTR 134 #endif 135 moveml sp@+,d0-d1/a0-a1 136 rte 137 138 /* 139 * No (more) data transfer interrupts. Do the normal 140 * stuff. 141 */ 142 hdfdc_norm: 143 tstl nintr 144 jeq 0f 145 movl nintr,d0 146 clrl nintr 147 addl d0, _intrcnt_user+88 | add another interrupt 148 #if defined(UVM) 149 addl d0,_C_LABEL(uvmexp)+UVMEXP_INTRS 150 #else 151 addl d0,_C_LABEL(cnt)+V_INTR 152 #endif 153 0: jbsr _fdc_ctrl_intr | handle interrupt 154 moveml sp@+,d0-d1/a0-a1 | and saved registers 155 jra rei 156 157 .data 158 nintr: 159 .long 0 160
Indexes created Mon Sep 29 03:10:08 GMT 2025