| 1 | /* |
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| 2 | * Copyright (C) 1999-2002 Hewlett-Packard Co |
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| 3 | * Stephane Eranian <eranian@hpl.hp.com> |
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| 4 | * David Mosberger-Tang <davidm@hpl.hp.com> |
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| 5 | * Copyright (C) 2002 Ken Chen <kenneth.w.chen@intel.com> |
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| 6 | * |
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| 7 | * 1/06/01 davidm Tuned for Itanium. |
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| 8 | * 2/12/02 kchen Tuned for both Itanium and McKinley |
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| 9 | * 3/08/02 davidm Some more tweaking |
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| 10 | */ |
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| 11 | #include <linux/config.h> |
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| 12 | |
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| 13 | #include <asm/asmmacro.h> |
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| 14 | #include <asm/page.h> |
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| 15 | |
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| 16 | #ifdef CONFIG_ITANIUM |
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| 17 | # define L3_LINE_SIZE 64 // Itanium L3 line size |
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| 18 | # define PREFETCH_LINES 9 // magic number |
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| 19 | #else |
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| 20 | # define L3_LINE_SIZE 128 // McKinley L3 line size |
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| 21 | # define PREFETCH_LINES 12 // magic number |
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| 22 | #endif |
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| 23 | |
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| 24 | #define saved_lc r2 |
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| 25 | #define dst_fetch r3 |
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| 26 | #define dst1 r8 |
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| 27 | #define dst2 r9 |
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| 28 | #define dst3 r10 |
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| 29 | #define dst4 r11 |
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| 30 | |
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| 31 | #define dst_last r31 |
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| 32 | |
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| 33 | GLOBAL_ENTRY(clear_page) |
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| 34 | .prologue |
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| 35 | .regstk 1,0,0,0 |
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| 36 | mov r16 = PAGE_SIZE/L3_LINE_SIZE-1 // main loop count, -1=repeat/until |
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| 37 | .save ar.lc, saved_lc |
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| 38 | mov saved_lc = ar.lc |
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| 39 | |
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| 40 | .body |
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| 41 | mov ar.lc = (PREFETCH_LINES - 1) |
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| 42 | mov dst_fetch = in0 |
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| 43 | adds dst1 = 16, in0 |
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| 44 | adds dst2 = 32, in0 |
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| 45 | ;; |
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| 46 | .fetch: stf.spill.nta [dst_fetch] = f0, L3_LINE_SIZE |
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| 47 | adds dst3 = 48, in0 // executing this multiple times is harmless |
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| 48 | br.cloop.sptk.few .fetch |
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| 49 | ;; |
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| 50 | addl dst_last = (PAGE_SIZE - PREFETCH_LINES*L3_LINE_SIZE), dst_fetch |
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| 51 | mov ar.lc = r16 // one L3 line per iteration |
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| 52 | adds dst4 = 64, in0 |
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| 53 | ;; |
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| 54 | #ifdef CONFIG_ITANIUM |
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| 55 | // Optimized for Itanium |
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| 56 | 1: stf.spill.nta [dst1] = f0, 64 |
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| 57 | stf.spill.nta [dst2] = f0, 64 |
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| 58 | cmp.lt p8,p0=dst_fetch, dst_last |
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| 59 | ;; |
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| 60 | #else |
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| 61 | // Optimized for McKinley |
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| 62 | 1: stf.spill.nta [dst1] = f0, 64 |
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| 63 | stf.spill.nta [dst2] = f0, 64 |
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| 64 | stf.spill.nta [dst3] = f0, 64 |
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| 65 | stf.spill.nta [dst4] = f0, 128 |
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| 66 | cmp.lt p8,p0=dst_fetch, dst_last |
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| 67 | ;; |
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| 68 | stf.spill.nta [dst1] = f0, 64 |
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| 69 | stf.spill.nta [dst2] = f0, 64 |
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| 70 | #endif |
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| 71 | stf.spill.nta [dst3] = f0, 64 |
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| 72 | (p8) stf.spill.nta [dst_fetch] = f0, L3_LINE_SIZE |
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| 73 | br.cloop.sptk.few 1b |
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| 74 | ;; |
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| 75 | mov ar.lc = saved_lc // restore lc |
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| 76 | br.ret.sptk.many rp |
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| 77 | END(clear_page) |
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