unmaptlball.s
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/**************************************************************************
* *
* Copyright (C) 1994, Silicon Graphics, Inc. *
* *
* These coded instructions, statements, and computer programs contain *
* unpublished proprietary information of Silicon Graphics, Inc., and *
* are protected by Federal copyright law. They may not be disclosed *
* to third parties or copied or duplicated in any form, in whole or *
* in part, without the prior written consent of Silicon Graphics, Inc. *
* *
**************************************************************************/
#include <asm.h>
#include <regdef.h>
#include <R4300.h>
/*
* osUnmapTLBAll(void)
*/
.set noreorder
LEAF(osUnmapTLBAll)
mfc0 t0,C0_ENTRYHI # save TLBPID
li t1,NTLBENTRIES - 1 # initialize counter
li t2,K0BASE # set virtual address to unmapped
mtc0 t2,C0_ENTRYHI # (necessary on R4300)
mtc0 zero,C0_ENTRYLO0 # make even page invalid
mtc0 zero,C0_ENTRYLO1 # make odd page invalid
1:
mtc0 t1,C0_INX # set TLB index
nop # 7-5-1 = 1 nop
tlbwi # invalidate
nop # 8-3-1 = 4 nop
nop # 1 already in delay slot
sub t1,1 # decrement counter
bge t1,zero,1b # branch if not yet done
nop
mtc0 t0,C0_ENTRYHI # restore saved TLBPID
j ra
nop
END(osUnmapTLBAll)