1/* 2 * 3 * Optimized version of the standard copy_page() function 4 * 5 * Inputs: 6 * in0: address of target page 7 * in1: address of source page 8 * Output: 9 * no return value 10 * 11 * Copyright (C) 1999, 2001 Hewlett-Packard Co 12 * Stephane Eranian <eranian@hpl.hp.com> 13 * David Mosberger <davidm@hpl.hp.com> 14 * 15 * 4/06/01 davidm Tuned to make it perform well both for cached and uncached copies. 16 */ 17#include <asm/asmmacro.h> 18#include <asm/page.h> 19 20#define PIPE_DEPTH 3 21#define EPI p[PIPE_DEPTH-1] 22 23#define lcount r16 24#define saved_pr r17 25#define saved_lc r18 26#define saved_pfs r19 27#define src1 r20 28#define src2 r21 29#define tgt1 r22 30#define tgt2 r23 31#define srcf r24 32#define tgtf r25 33#define tgt_last r26 34 35#define Nrot ((8*PIPE_DEPTH+7)&~7) 36 37GLOBAL_ENTRY(copy_page) 38 .prologue 39 .save ar.pfs, saved_pfs 40 alloc saved_pfs=ar.pfs,3,Nrot-3,0,Nrot 41 42 .rotr t1[PIPE_DEPTH], t2[PIPE_DEPTH], t3[PIPE_DEPTH], t4[PIPE_DEPTH], \ 43 t5[PIPE_DEPTH], t6[PIPE_DEPTH], t7[PIPE_DEPTH], t8[PIPE_DEPTH] 44 .rotp p[PIPE_DEPTH] 45 46 .save ar.lc, saved_lc 47 mov saved_lc=ar.lc 48 mov ar.ec=PIPE_DEPTH 49 50 mov lcount=PAGE_SIZE/64-1 51 .save pr, saved_pr 52 mov saved_pr=pr 53 mov pr.rot=1<<16 54 55 .body 56 57 mov src1=in1 58 adds src2=8,in1 59 mov tgt_last = PAGE_SIZE 60 ;; 61 adds tgt2=8,in0 62 add srcf=512,in1 63 mov ar.lc=lcount 64 mov tgt1=in0 65 add tgtf=512,in0 66 add tgt_last = tgt_last, in0 67 ;; 681: 69(p[0]) ld8 t1[0]=[src1],16 70(EPI) st8 [tgt1]=t1[PIPE_DEPTH-1],16 71(p[0]) ld8 t2[0]=[src2],16 72(EPI) st8 [tgt2]=t2[PIPE_DEPTH-1],16 73 cmp.ltu p6,p0 = tgtf, tgt_last 74 ;; 75(p[0]) ld8 t3[0]=[src1],16 76(EPI) st8 [tgt1]=t3[PIPE_DEPTH-1],16 77(p[0]) ld8 t4[0]=[src2],16 78(EPI) st8 [tgt2]=t4[PIPE_DEPTH-1],16 79 ;; 80(p[0]) ld8 t5[0]=[src1],16 81(EPI) st8 [tgt1]=t5[PIPE_DEPTH-1],16 82(p[0]) ld8 t6[0]=[src2],16 83(EPI) st8 [tgt2]=t6[PIPE_DEPTH-1],16 84 ;; 85(p[0]) ld8 t7[0]=[src1],16 86(EPI) st8 [tgt1]=t7[PIPE_DEPTH-1],16 87(p[0]) ld8 t8[0]=[src2],16 88(EPI) st8 [tgt2]=t8[PIPE_DEPTH-1],16 89 90(p6) lfetch [srcf], 64 91(p6) lfetch [tgtf], 64 92 br.ctop.sptk.few 1b 93 ;; 94 mov pr=saved_pr,0xffffffffffff0000 // restore predicates 95 mov ar.pfs=saved_pfs 96 mov ar.lc=saved_lc 97 br.ret.sptk.many rp 98END(copy_page) 99