102 lines
2.1 KiB
ArmAsm
102 lines
2.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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*
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* Optimized version of the standard copy_page() function
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*
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* Inputs:
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* in0: address of target page
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* in1: address of source page
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* Output:
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* no return value
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*
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* Copyright (C) 1999, 2001 Hewlett-Packard Co
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* Stephane Eranian <eranian@hpl.hp.com>
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* David Mosberger <davidm@hpl.hp.com>
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*
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* 4/06/01 davidm Tuned to make it perform well both for cached and uncached copies.
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*/
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#include <asm/asmmacro.h>
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#include <asm/page.h>
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#include <asm/export.h>
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#define PIPE_DEPTH 3
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#define EPI p[PIPE_DEPTH-1]
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#define lcount r16
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#define saved_pr r17
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#define saved_lc r18
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#define saved_pfs r19
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#define src1 r20
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#define src2 r21
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#define tgt1 r22
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#define tgt2 r23
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#define srcf r24
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#define tgtf r25
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#define tgt_last r26
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#define Nrot ((8*PIPE_DEPTH+7)&~7)
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GLOBAL_ENTRY(copy_page)
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.prologue
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.save ar.pfs, saved_pfs
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alloc saved_pfs=ar.pfs,3,Nrot-3,0,Nrot
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.rotr t1[PIPE_DEPTH], t2[PIPE_DEPTH], t3[PIPE_DEPTH], t4[PIPE_DEPTH], \
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t5[PIPE_DEPTH], t6[PIPE_DEPTH], t7[PIPE_DEPTH], t8[PIPE_DEPTH]
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.rotp p[PIPE_DEPTH]
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.save ar.lc, saved_lc
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mov saved_lc=ar.lc
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mov ar.ec=PIPE_DEPTH
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mov lcount=PAGE_SIZE/64-1
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.save pr, saved_pr
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mov saved_pr=pr
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mov pr.rot=1<<16
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.body
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mov src1=in1
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adds src2=8,in1
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mov tgt_last = PAGE_SIZE
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;;
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adds tgt2=8,in0
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add srcf=512,in1
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mov ar.lc=lcount
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mov tgt1=in0
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add tgtf=512,in0
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add tgt_last = tgt_last, in0
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;;
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1:
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(p[0]) ld8 t1[0]=[src1],16
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(EPI) st8 [tgt1]=t1[PIPE_DEPTH-1],16
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(p[0]) ld8 t2[0]=[src2],16
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(EPI) st8 [tgt2]=t2[PIPE_DEPTH-1],16
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cmp.ltu p6,p0 = tgtf, tgt_last
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;;
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(p[0]) ld8 t3[0]=[src1],16
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(EPI) st8 [tgt1]=t3[PIPE_DEPTH-1],16
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(p[0]) ld8 t4[0]=[src2],16
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(EPI) st8 [tgt2]=t4[PIPE_DEPTH-1],16
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;;
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(p[0]) ld8 t5[0]=[src1],16
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(EPI) st8 [tgt1]=t5[PIPE_DEPTH-1],16
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(p[0]) ld8 t6[0]=[src2],16
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(EPI) st8 [tgt2]=t6[PIPE_DEPTH-1],16
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;;
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(p[0]) ld8 t7[0]=[src1],16
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(EPI) st8 [tgt1]=t7[PIPE_DEPTH-1],16
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(p[0]) ld8 t8[0]=[src2],16
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(EPI) st8 [tgt2]=t8[PIPE_DEPTH-1],16
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(p6) lfetch [srcf], 64
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(p6) lfetch [tgtf], 64
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br.ctop.sptk.few 1b
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;;
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mov pr=saved_pr,0xffffffffffff0000 // restore predicates
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mov ar.pfs=saved_pfs
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mov ar.lc=saved_lc
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br.ret.sptk.many rp
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END(copy_page)
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EXPORT_SYMBOL(copy_page)
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