142 lines
4.6 KiB
ArmAsm
142 lines
4.6 KiB
ArmAsm
/* $NetBSD: hdfd_intr.s,v 1.1 1996/11/09 22:27:26 leo Exp $
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/*
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* Copyright (c) 1996 Leo Weppelman.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Leo Weppelman.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include "assym.h"
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#include <atari/dev/hdfdreg.h>
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.globl _fddmaaddr
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.globl _fdio_addr,_fddmalen
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.globl _mfp_hdfd_nf, _mfp_hdfd_fifo
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/*
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* Entry point when there is no fifo. Handles the read/write
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* interrupts a bit faster because it *knows* that there is only
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* one character waiting.
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*/
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_mfp_hdfd_nf:
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addql #1,_intrcnt+12 | XXX: add another fdc/acsi interrupt
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moveml d0-d1/a0-a1,sp@- | Save scratch registers
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movl _fdio_addr,a0 | Get base of fdc registers
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movb a0@(fdsts),d0 | Get fdsts
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btst #5,d0 | Dma active?
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jeq hdfdc_norm | No, normal interrupt
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tstl _fddmalen | Bytecount zero?
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jeq hdfdc_norm | Yes -> normal interrupt
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movl _fddmaaddr, a1 | a1 = dmabuffer
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btst #6,d0 | Read?
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jeq hdfd_wrt_nf | No, write
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hdfd_rd_nf:
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movb a0@(fddata),a1@+ | Get a byte
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1:
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subql #1, _fddmalen | decrement bytecount
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movl a1,_fddmaaddr | update dma pointer
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addql #1,_cnt+V_INTR | chalk up another interrupt
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moveml sp@+,d0-d1/a0-a1
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rte
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hdfd_wrt_nf:
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movb a1@+,a0@(fddata) | Push a byte
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jra 1b | And get out...
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/*
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* Systems *with* fifo's enter here.
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*/
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_mfp_hdfd_fifo:
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addql #1,_intrcnt+12 | XXX: add another fdc/acsi interrupt
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moveml d0-d1/a0-a1,sp@- | Save scratch registers
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movl _fdio_addr,a0 | Get base of fdc registers
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movb a0@(fdsts),d0 | Get fdsts
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btst #5,d0 | Dma active?
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jeq hdfdc_norm | No, normal interrupt
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movl _fddmaaddr, a1 | a1 = dmabuffer
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btst #6,d0 | Read?
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jeq hdfd_wrt | No, write
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hdfd_rd:
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tstl _fddmalen | Bytecount zero?
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jeq hdfdc1 | Yes -> done
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movb a0@(fddata),a1@+ | Get a byte
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subql #1, _fddmalen | decrement bytecount
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movb a0@(fdsts),d0 | Get fdsts
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andb #0xa0,d0 | both NE7_NDM and NE7_RQM active?
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cmpb #0xa0,d0
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jne hdfdc1 | No, end of this batch
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jra hdfd_rd
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hdfd_wrt:
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tstl _fddmalen | Bytecount zero?
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jeq hdfdc1 | Yes -> done
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movb a1@+,a0@(fddata) | Push a byte
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subql #1, _fddmalen | decrement bytecount
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jra hdfdc1
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movb a0@(fdsts),d0 | Get fdsts
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andb #0xa0,d0 | both NE7_NDM and NE7_RQM active?
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cmpb #0xa0,d0
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jne hdfdc1 | No, end of this batch
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jra hdfd_wrt
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hdfdc1:
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movl a1,_fddmaaddr | update buffer pointer
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btst #5,d0 | Dma still active?
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jeq hdfdc_norm | No -> take normal interrupt
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/*
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* Exit for read/write interrupts. Calling 'rei' this often
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* seems wrong....
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*/
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hdfdc_xit:
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addql #1,_cnt+V_INTR | chalk up another interrupt
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moveml sp@+,d0-d1/a0-a1
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rte
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/*
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* No (more) data transfer interrupts. Do the normal
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* stuff.
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*/
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hdfdc_norm:
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lea sp@(16),a0 | push pointer to trap-frame
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movl a0,sp@-
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jbsr _fdc_ctrl_intr | handle interrupt
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addql #4,sp | pop trap-frame pointer
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moveml sp@+,d0-d1/a0-a1 | and saved registers
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addql #1,_cnt+V_INTR | chalk up another interrupt
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jra rei
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