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/* $OpenBSD: areahand.S,v 1.2 2000/03/03 00:54:47 todd Exp $ */
/* $NetBSD: areahand.S,v 1.1 1996/01/31 23:18:01 mark Exp $ */
/*
* Copyright (c) 1994 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Brini.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* RiscBSD kernel project
*
* areahand.s
*
*
*
* Created : 12/09/94
* Last updated : 12/09/94
*
*/
#include "regs.h"
.text
.global _kernarea_handler
/*
* r0 - code
* r1 - page block
* r2 - entries
* r3 - size increase
* r4 - current size
* r5 - pagesize
* r12 - arrangement table
*/
_kernarea_handler:
/* Is it a pregrow request ? */
teq r0, #0x00000000
bicnes pc, lr, #1<<28
/* Make sure that the area is currently 0 in size */
teq r4, #0x00000000
movne r0, #0x000000
orrnes pc, lr, #1<<28
teq r1, #0x00000000
biceqs pc, lr, #1<<28
/* Store registers */
stmfd sp!, {r0-r12}
/* Get first page number */
ldr r8, [r12, #0x0004]
sub r8, r8, r2
mov r8, #0x00000700
str r1, [r12]
loop:
str r8, [r1], #0x000c
add r8, r8, #0x00000001
subs r2, r2, #0x00000001
bne loop
ldmfd sp!, {r0-r12}
/* bics pc, lr, #1<<28 */
adr r0, error1
orrs pc, lr, #1<<28
error1:
.word 0
.asciz "error1"
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