08003631cc
Register usage changed to free fiq mode r13. Added loop to keep reading bytes while the floppy FIQ is asserted.
119 lines
3.3 KiB
ArmAsm
119 lines
3.3 KiB
ArmAsm
/* $NetBSD: iomd_fiq.S,v 1.2 1996/05/06 00:21:05 mark Exp $ */
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/*
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* Copyright (c) 1994-1996 Mark Brinicombe.
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* Copyright (c) 1994 Brini.
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* All rights reserved.
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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 Mark Brinicombe.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL HTE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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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* RiscBSD kernel project
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*
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* fiq.S
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*
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* Low level fiq handlers
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*
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* Created : 27/09/94
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*/
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#include <machine/cpu.h>
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sp .req r13
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lr .req r14
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pc .req r15
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.text
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/*
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* if NOFDFIQLOOPS is defined only 1 byte is transferred per
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* FIQ. The new default behaviour is to keep looping
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* until there are no FD FIQ's pending.
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*/
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.global _floppy_read_fiq
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.global _floppy_read_fiq_end
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/*
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* These registers needs to be consistent with fd
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* driver's assignment.
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*
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* r8 - scratch
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* r9 - IOMD_FIQRQ
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* r10 - transfer size
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* r11 - data address
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* r12 - floppy controller DACK address (+ 0x18000 for TC)
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* r13 - scratch (loop counter)
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*/
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_floppy_read_fiq:
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subs r10, r10, #0x00000001
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addeq r12, r12, #0x00018000
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ldrb r8, [r12]
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strb r8, [r11], #0x0001
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#ifndef NOFDFIQLOOPS
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subeqs pc, lr, #0x00000004
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ldrb r8, [r9]
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tst r8, #0x01
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addne r13, r13, #0x00000001
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bne _floppy_read_fiq
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#endif
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subs pc, lr, #0x00000004
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_floppy_read_fiq_end:
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.global _floppy_write_fiq
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.global _floppy_write_fiq_end
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/*
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* These registers needs to be consistent with fd
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* driver's assignment.
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*
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* r8 - scratch
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* r9 - IOMD_FIQRQ
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* r10 - transfer size
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* r11 - data address
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* r12 - floppy controller DACK address (+ 0x18000 for TC)
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* r13 - scratch (loop counter)
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*/
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_floppy_write_fiq:
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subs r10, r10, #0x00000001
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addeq r12, r12, #0x00018000
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ldrb r8, [r11], #0x0001
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strb r8, [r12]
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#ifndef NOFDFIQLOOPS
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subeqs pc, lr, #0x00000004
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ldrb r8, [r9]
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tst r8, #0x01
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addne r13, r13, #0x00000001
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bne _floppy_write_fiq
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#endif
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subs pc, lr, #0x00000004
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_floppy_write_fiq_end:
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/* End of fiq.S */
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