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/*
*
* Optimized version of the standard clearpage() function
*
* Based on comments from ddd. Try not to overflow the write buffer.
*
* Inputs:
* in0: address of page
*
* Output:
* none
*
* Copyright (C) 1999 Hewlett-Packard Co
* Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
* Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
*/
#include <asm/page.h>
.text
.psr abi64
.psr lsb
.lsb
.align 32
.global clear_page
.proc clear_page
clear_page:
alloc r11=ar.pfs,1,0,0,0
mov r16=ar.lc // slow
mov r17=PAGE_SIZE/32-1 // -1 = repeat/until
;;
adds r18=16,in0
mov ar.lc=r17
;;
1: stf.spill.nta [in0]=f0,32
stf.spill.nta [r18]=f0,32
br.cloop.dptk.few 1b
;;
mov ar.lc=r16 // restore lc
br.ret.sptk.few rp
.endp clear_page
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