projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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> | |
| e007c533 | 19 | #include <asm/export.h> |
| 1da177e4 LT |
20 | |
| 21 | #define PIPE_DEPTH 3 | |
| 22 | #define EPI p[PIPE_DEPTH-1] | |
| 23 | ||
| 24 | #define lcount r16 | |
| 25 | #define saved_pr r17 | |
| 26 | #define saved_lc r18 | |
| 27 | #define saved_pfs r19 | |
| 28 | #define src1 r20 | |
| 29 | #define src2 r21 | |
| 30 | #define tgt1 r22 | |
| 31 | #define tgt2 r23 | |
| 32 | #define srcf r24 | |
| 33 | #define tgtf r25 | |
| 34 | #define tgt_last r26 | |
| 35 | ||
| 36 | #define Nrot ((8*PIPE_DEPTH+7)&~7) | |
| 37 | ||
| 38 | GLOBAL_ENTRY(copy_page) | |
| 39 | .prologue | |
| 40 | .save ar.pfs, saved_pfs | |
| 41 | alloc saved_pfs=ar.pfs,3,Nrot-3,0,Nrot | |
| 42 | ||
| 43 | .rotr t1[PIPE_DEPTH], t2[PIPE_DEPTH], t3[PIPE_DEPTH], t4[PIPE_DEPTH], \ | |
| 44 | t5[PIPE_DEPTH], t6[PIPE_DEPTH], t7[PIPE_DEPTH], t8[PIPE_DEPTH] | |
| 45 | .rotp p[PIPE_DEPTH] | |
| 46 | ||
| 47 | .save ar.lc, saved_lc | |
| 48 | mov saved_lc=ar.lc | |
| 49 | mov ar.ec=PIPE_DEPTH | |
| 50 | ||
| 51 | mov lcount=PAGE_SIZE/64-1 | |
| 52 | .save pr, saved_pr | |
| 53 | mov saved_pr=pr | |
| 54 | mov pr.rot=1<<16 | |
| 55 | ||
| 56 | .body | |
| 57 | ||
| 58 | mov src1=in1 | |
| 59 | adds src2=8,in1 | |
| 60 | mov tgt_last = PAGE_SIZE | |
| 61 | ;; | |
| 62 | adds tgt2=8,in0 | |
| 63 | add srcf=512,in1 | |
| 64 | mov ar.lc=lcount | |
| 65 | mov tgt1=in0 | |
| 66 | add tgtf=512,in0 | |
| 67 | add tgt_last = tgt_last, in0 | |
| 68 | ;; | |
| 69 | 1: | |
| 70 | (p[0]) ld8 t1[0]=[src1],16 | |
| 71 | (EPI) st8 [tgt1]=t1[PIPE_DEPTH-1],16 | |
| 72 | (p[0]) ld8 t2[0]=[src2],16 | |
| 73 | (EPI) st8 [tgt2]=t2[PIPE_DEPTH-1],16 | |
| 74 | cmp.ltu p6,p0 = tgtf, tgt_last | |
| 75 | ;; | |
| 76 | (p[0]) ld8 t3[0]=[src1],16 | |
| 77 | (EPI) st8 [tgt1]=t3[PIPE_DEPTH-1],16 | |
| 78 | (p[0]) ld8 t4[0]=[src2],16 | |
| 79 | (EPI) st8 [tgt2]=t4[PIPE_DEPTH-1],16 | |
| 80 | ;; | |
| 81 | (p[0]) ld8 t5[0]=[src1],16 | |
| 82 | (EPI) st8 [tgt1]=t5[PIPE_DEPTH-1],16 | |
| 83 | (p[0]) ld8 t6[0]=[src2],16 | |
| 84 | (EPI) st8 [tgt2]=t6[PIPE_DEPTH-1],16 | |
| 85 | ;; | |
| 86 | (p[0]) ld8 t7[0]=[src1],16 | |
| 87 | (EPI) st8 [tgt1]=t7[PIPE_DEPTH-1],16 | |
| 88 | (p[0]) ld8 t8[0]=[src2],16 | |
| 89 | (EPI) st8 [tgt2]=t8[PIPE_DEPTH-1],16 | |
| 90 | ||
| 91 | (p6) lfetch [srcf], 64 | |
| 92 | (p6) lfetch [tgtf], 64 | |
| 93 | br.ctop.sptk.few 1b | |
| 94 | ;; | |
| 95 | mov pr=saved_pr,0xffffffffffff0000 // restore predicates | |
| 96 | mov ar.pfs=saved_pfs | |
| 97 | mov ar.lc=saved_lc | |
| 98 | br.ret.sptk.many rp | |
| 99 | END(copy_page) | |
| e007c533 | 100 | EXPORT_SYMBOL(copy_page) |