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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