94 lines
2.7 KiB
ArmAsm
94 lines
2.7 KiB
ArmAsm
/* $NetBSD: areahand.S,v 1.2 1996/06/03 21:24:50 mark Exp $ */
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/*
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* Copyright (c) 1994 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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* This code is derived from software written for Brini by Mark Brinicombe
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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 Brini.
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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 BRINI ``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 THE REGENTS 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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* areahand.s
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*
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* Created : 12/09/94
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*/
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#include "regs.h"
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.text
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.global _kernarea_handler
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/*
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* r0 - code
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* r1 - page block
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* r2 - entries
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* r3 - size increase
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* r4 - current size
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* r5 - pagesize
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* r12 - arrangement table
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*/
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_kernarea_handler:
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/* Is it a pregrow request ? */
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teq r0, #0x00000000
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bicnes pc, lr, #1<<28
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/* Make sure that the area is currently 0 in size */
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teq r4, #0x00000000
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movne r0, #0x000000
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orrnes pc, lr, #1<<28
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teq r1, #0x00000000
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biceqs pc, lr, #1<<28
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/* Store registers */
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stmfd sp!, {r0-r12}
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/* Get first page number */
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ldr r8, [r12, #0x0004]
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sub r8, r8, r2
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mov r8, #0x00000700
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str r1, [r12]
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loop:
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str r8, [r1], #0x000c
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add r8, r8, #0x00000001
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subs r2, r2, #0x00000001
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bne loop
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ldmfd sp!, {r0-r12}
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/* bics pc, lr, #1<<28 */
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adr r0, error1
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orrs pc, lr, #1<<28
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error1:
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.word 0
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.asciz "error1"
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