hdfd_intr.s revision 1.7.4.2
1 1.7.4.2 thomas /* $NetBSD: hdfd_intr.s,v 1.7.4.2 2001/09/08 11:15:36 thomas Exp $ 2 1.7.4.2 thomas 3 1.7.4.2 thomas /* 4 1.7.4.2 thomas * Copyright (c) 1996 Leo Weppelman. 5 1.7.4.2 thomas * All rights reserved. 6 1.7.4.2 thomas * 7 1.7.4.2 thomas * This code is derived from software contributed to Berkeley by 8 1.7.4.2 thomas * the Systems Programming Group of the University of Utah Computer 9 1.7.4.2 thomas * Science Department. 10 1.7.4.2 thomas * 11 1.7.4.2 thomas * Redistribution and use in source and binary forms, with or without 12 1.7.4.2 thomas * modification, are permitted provided that the following conditions 13 1.7.4.2 thomas * are met: 14 1.7.4.2 thomas * 1. Redistributions of source code must retain the above copyright 15 1.7.4.2 thomas * notice, this list of conditions and the following disclaimer. 16 1.7.4.2 thomas * 2. Redistributions in binary form must reproduce the above copyright 17 1.7.4.2 thomas * notice, this list of conditions and the following disclaimer in the 18 1.7.4.2 thomas * documentation and/or other materials provided with the distribution. 19 1.7.4.2 thomas * 3. All advertising materials mentioning features or use of this software 20 1.7.4.2 thomas * must display the following acknowledgement: 21 1.7.4.2 thomas * This product includes software developed by Leo Weppelman. 22 1.7.4.2 thomas * 4. Neither the name of the University nor the names of its contributors 23 1.7.4.2 thomas * may be used to endorse or promote products derived from this software 24 1.7.4.2 thomas * without specific prior written permission. 25 1.7.4.2 thomas * 26 1.7.4.2 thomas * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 1.7.4.2 thomas * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 1.7.4.2 thomas * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 1.7.4.2 thomas * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 1.7.4.2 thomas * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 1.7.4.2 thomas * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 1.7.4.2 thomas * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 1.7.4.2 thomas * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 1.7.4.2 thomas * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 1.7.4.2 thomas * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 1.7.4.2 thomas * SUCH DAMAGE. 37 1.7.4.2 thomas * 38 1.7.4.2 thomas */ 39 1.7.4.2 thomas 40 1.7.4.2 thomas #include "assym.h" 41 1.7.4.2 thomas #include <machine/asm.h> 42 1.7.4.2 thomas #define ASSEMBLER /* XXX */ 43 1.7.4.2 thomas #include <atari/dev/hdfdreg.h> 44 1.7.4.2 thomas 45 1.7.4.2 thomas .text 46 1.7.4.2 thomas .globl _C_LABEL(fddmaaddr) 47 1.7.4.2 thomas .globl _C_LABEL(fdio_addr),_C_LABEL(fddmalen) 48 1.7.4.2 thomas 49 1.7.4.2 thomas /* 50 1.7.4.2 thomas * Entry point when there is no fifo. Handles the read/write 51 1.7.4.2 thomas * interrupts a bit faster because it *knows* that there is only 52 1.7.4.2 thomas * one character waiting. 53 1.7.4.2 thomas */ 54 1.7.4.2 thomas ENTRY_NOPROFILE(mfp_hdfd_nf) 55 1.7.4.2 thomas addql #1,nintr | add another interrupt 56 1.7.4.2 thomas 57 1.7.4.2 thomas moveml %d0-%d1/%a0-%a1,%sp@- | Save scratch registers 58 1.7.4.2 thomas movl _C_LABEL(fdio_addr),%a0 | Get base of fdc registers 59 1.7.4.2 thomas movb %a0@(fdsts),%d0 | Get fdsts 60 1.7.4.2 thomas btst #5,%d0 | Dma active? 61 1.7.4.2 thomas jeq hdfdc_norm | No, normal interrupt 62 1.7.4.2 thomas tstl _C_LABEL(fddmalen) | Bytecount zero? 63 1.7.4.2 thomas jeq hdfdc_norm | Yes -> normal interrupt 64 1.7.4.2 thomas 65 1.7.4.2 thomas movl _C_LABEL(fddmaaddr),%a1 | a1 = dmabuffer 66 1.7.4.2 thomas btst #6,%d0 | Read? 67 1.7.4.2 thomas jeq hdfd_wrt_nf | No, write 68 1.7.4.2 thomas hdfd_rd_nf: 69 1.7.4.2 thomas movb %a0@(fddata),%a1@+ | Get a byte 70 1.7.4.2 thomas 1: 71 1.7.4.2 thomas subql #1, _C_LABEL(fddmalen) | decrement bytecount 72 1.7.4.2 thomas movl %a1,_C_LABEL(fddmaaddr) | update dma pointer 73 1.7.4.2 thomas | addql #1,_cnt+V_INTR | chalk up another interrupt 74 1.7.4.2 thomas moveml %sp@+,%d0-%d1/%a0-%a1 75 1.7.4.2 thomas rte 76 1.7.4.2 thomas hdfd_wrt_nf: 77 1.7.4.2 thomas movb %a1@+,%a0@(fddata) | Push a byte 78 1.7.4.2 thomas jra 1b | And get out... 79 1.7.4.2 thomas 80 1.7.4.2 thomas /* 81 1.7.4.2 thomas * Systems *with* fifo's enter here. 82 1.7.4.2 thomas */ 83 1.7.4.2 thomas ENTRY_NOPROFILE(mfp_hdfd_fifo) 84 1.7.4.2 thomas addql #1,_C_LABEL(intrcnt_user)+88 | add another interrupt 85 1.7.4.2 thomas 86 1.7.4.2 thomas moveml %d0-%d1/%a0-%a1,%sp@- | Save scratch registers 87 1.7.4.2 thomas movl _C_LABEL(fdio_addr),%a0 | Get base of fdc registers 88 1.7.4.2 thomas movb %a0@(fdsts),%d0 | Get fdsts 89 1.7.4.2 thomas btst #5,%d0 | Dma active? 90 1.7.4.2 thomas jeq hdfdc_norm | No, normal interrupt 91 1.7.4.2 thomas movl _C_LABEL(fddmaaddr),%a1 | a1 = dmabuffer 92 1.7.4.2 thomas btst #6,%d0 | Read? 93 1.7.4.2 thomas jeq hdfd_wrt | No, write 94 1.7.4.2 thomas 95 1.7.4.2 thomas hdfd_rd: 96 1.7.4.2 thomas tstl _C_LABEL(fddmalen) | Bytecount zero? 97 1.7.4.2 thomas jeq hdfdc1 | Yes -> done 98 1.7.4.2 thomas movb %a0@(fddata),%a1@+ | Get a byte 99 1.7.4.2 thomas subql #1, _C_LABEL(fddmalen) | decrement bytecount 100 1.7.4.2 thomas movb %a0@(fdsts),%d0 | Get fdsts 101 1.7.4.2 thomas andb #0xa0,%d0 | both NE7_NDM and NE7_RQM active? 102 1.7.4.2 thomas cmpb #0xa0,%d0 103 1.7.4.2 thomas jne hdfdc1 | No, end of this batch 104 1.7.4.2 thomas jra hdfd_rd 105 1.7.4.2 thomas 106 1.7.4.2 thomas hdfd_wrt: 107 1.7.4.2 thomas tstl _C_LABEL(fddmalen) | Bytecount zero? 108 1.7.4.2 thomas jeq hdfdc1 | Yes -> done 109 1.7.4.2 thomas movb %a1@+,%a0@(fddata) | Push a byte 110 1.7.4.2 thomas subql #1, _C_LABEL(fddmalen) | decrement bytecount 111 1.7.4.2 thomas jra hdfdc1 112 1.7.4.2 thomas movb %a0@(fdsts),%d0 | Get fdsts 113 1.7.4.2 thomas andb #0xa0,%d0 | both NE7_NDM and NE7_RQM active? 114 1.7.4.2 thomas cmpb #0xa0,%d0 115 1.7.4.2 thomas jne hdfdc1 | No, end of this batch 116 1.7.4.2 thomas jra hdfd_wrt 117 1.7.4.2 thomas 118 1.7.4.2 thomas hdfdc1: 119 1.7.4.2 thomas movl %a1,_C_LABEL(fddmaaddr) | update buffer pointer 120 1.7.4.2 thomas btst #5,%d0 | Dma still active? 121 1.7.4.2 thomas jeq hdfdc_norm | No -> take normal interrupt 122 1.7.4.2 thomas 123 1.7.4.2 thomas /* 124 1.7.4.2 thomas * Exit for read/write interrupts. Calling 'rei' this often 125 1.7.4.2 thomas * seems wrong.... 126 1.7.4.2 thomas */ 127 1.7.4.2 thomas hdfdc_xit: 128 1.7.4.2 thomas addql #1,_C_LABEL(uvmexp)+UVMEXP_INTRS 129 1.7.4.2 thomas moveml %sp@+,%d0-%d1/%a0-%a1 130 1.7.4.2 thomas rte 131 1.7.4.2 thomas 132 1.7.4.2 thomas /* 133 1.7.4.2 thomas * No (more) data transfer interrupts. Do the normal 134 1.7.4.2 thomas * stuff. 135 1.7.4.2 thomas */ 136 1.7.4.2 thomas hdfdc_norm: 137 1.7.4.2 thomas tstl nintr 138 1.7.4.2 thomas jeq 0f 139 1.7.4.2 thomas movl nintr,%d0 140 1.7.4.2 thomas clrl nintr 141 1.7.4.2 thomas addl %d0, _C_LABEL(intrcnt_user)+88 | add another interrupt 142 1.7.4.2 thomas addl %d0,_C_LABEL(uvmexp)+UVMEXP_INTRS 143 1.7.4.2 thomas 0: jbsr _C_LABEL(fdc_ctrl_intr) | handle interrupt 144 1.7.4.2 thomas moveml %sp@+,%d0-%d1/%a0-%a1 | and saved registers 145 1.7.4.2 thomas jra _ASM_LABEL(rei) 146 1.7.4.2 thomas 147 1.7.4.2 thomas .data 148 1.7.4.2 thomas nintr: 149 1.7.4.2 thomas .long 0 150
Indexes created Sat Oct 11 13:09:53 GMT 2025