1994-10-26 05:31:56 +03:00
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| $NetBSD: sias.s,v 1.2 1994/10/26 02:33:29 cgd Exp $
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1994-02-23 02:48:01 +03:00
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| Copyright (c) 1993 Paul Mackerras.
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| All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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| derived from this software withough specific prior written permission
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| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| Assembly-lang buffer R/W for SCSI
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| si{get,put} ptr,nb
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| return the number of bytes xferred
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.globl _siget
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_siget: link a6,#0
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movel a2,a7@-
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movel a6@(8),a1 | buffer
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movel a6@(12),d0 | # bytes
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beqs 9f
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movel d0,d1
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subql #1,d1
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movel #0xe98000,a0 | SBIC ptr
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lea a0@(2),a2
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moveb #0x19,a0@
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1: btst #0,a0@
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beqs 3f
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moveb a2@,a1@+
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dbra d1,1b
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3: addqw #1,d1
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subl d1,d0
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movel a7@,a2
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9: unlk a6
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rts
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.globl _siput
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_siput: link a6,#0
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movel a2,a7@-
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movel a6@(8),a1 | buffer
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movel a6@(12),d0 | # bytes
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beqs 9f
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movel d0,d1
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subql #1,d1
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movel #0xe98000,a0 | SBIC ptr
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lea a0@(2),a2
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moveb #0x19,a0@
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1: btst #0,a0@
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beqs 3f
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moveb a1@+,a2@
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2: dbra d1,1b
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3: addqw #1,d1
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subl d1,d0
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movel a7@,a2
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9: unlk a6
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rts
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