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/*
*
* Optimized function to clear a page of memory.
*
* Inputs:
* in0: address of page
*
* Output:
* none
*
* Copyright (C) 1999-2001 Hewlett-Packard Co
* Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
* Copyright (C) 1999-2001 David Mosberger-Tang <davidm@hpl.hp.com>
*
* 1/06/01 davidm Tuned for Itanium.
*/
#include <asm/asmmacro.h>
#include <asm/page.h>
#define saved_lc r2
#define dst0 in0
#define dst1 r8
#define dst2 r9
#define dst3 r10
#define dst_fetch r11
GLOBAL_ENTRY(clear_page)
.prologue
.regstk 1,0,0,0
mov r16 = PAGE_SIZE/64-1 // -1 = repeat/until
;;
.save ar.lc, saved_lc
mov saved_lc = ar.lc
.body
mov ar.lc = r16
adds dst1 = 16, dst0
adds dst2 = 32, dst0
adds dst3 = 48, dst0
adds dst_fetch = 512, dst0
;;
1: stf.spill.nta [dst0] = f0, 64
stf.spill.nta [dst1] = f0, 64
stf.spill.nta [dst2] = f0, 64
stf.spill.nta [dst3] = f0, 64
lfetch [dst_fetch], 64
br.cloop.dptk.few 1b
;;
mov ar.lc = r2 // restore lc
br.ret.sptk.few rp
END(clear_page)
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