ia64/xen-unstable

view xen/arch/ia64/linux/clear_page.S @ 10888:5379548bfc79

[NET] Enable TCPv4 segmentation offload in front/back drivers.
Signed-off-by: Keir Fraser <keir@xensource.com>
author kfraser@localhost.localdomain
date Tue Aug 01 11:54:45 2006 +0100 (2006-08-01)
parents 3ca4ca7a9cc2
children
line source
1 /*
2 * Copyright (C) 1999-2002 Hewlett-Packard Co
3 * Stephane Eranian <eranian@hpl.hp.com>
4 * David Mosberger-Tang <davidm@hpl.hp.com>
5 * Copyright (C) 2002 Ken Chen <kenneth.w.chen@intel.com>
6 *
7 * 1/06/01 davidm Tuned for Itanium.
8 * 2/12/02 kchen Tuned for both Itanium and McKinley
9 * 3/08/02 davidm Some more tweaking
10 */
11 #include <linux/config.h>
13 #include <asm/asmmacro.h>
14 #include <asm/page.h>
16 #ifdef CONFIG_ITANIUM
17 # define L3_LINE_SIZE 64 // Itanium L3 line size
18 # define PREFETCH_LINES 9 // magic number
19 #else
20 # define L3_LINE_SIZE 128 // McKinley L3 line size
21 # define PREFETCH_LINES 12 // magic number
22 #endif
24 #define saved_lc r2
25 #define dst_fetch r3
26 #define dst1 r8
27 #define dst2 r9
28 #define dst3 r10
29 #define dst4 r11
31 #define dst_last r31
33 GLOBAL_ENTRY(clear_page)
34 .prologue
35 .regstk 1,0,0,0
36 mov r16 = PAGE_SIZE/L3_LINE_SIZE-1 // main loop count, -1=repeat/until
37 .save ar.lc, saved_lc
38 mov saved_lc = ar.lc
40 .body
41 mov ar.lc = (PREFETCH_LINES - 1)
42 mov dst_fetch = in0
43 adds dst1 = 16, in0
44 adds dst2 = 32, in0
45 ;;
46 .fetch: stf.spill.nta [dst_fetch] = f0, L3_LINE_SIZE
47 adds dst3 = 48, in0 // executing this multiple times is harmless
48 br.cloop.sptk.few .fetch
49 ;;
50 addl dst_last = (PAGE_SIZE - PREFETCH_LINES*L3_LINE_SIZE), dst_fetch
51 mov ar.lc = r16 // one L3 line per iteration
52 adds dst4 = 64, in0
53 ;;
54 #ifdef CONFIG_ITANIUM
55 // Optimized for Itanium
56 1: stf.spill.nta [dst1] = f0, 64
57 stf.spill.nta [dst2] = f0, 64
58 cmp.lt p8,p0=dst_fetch, dst_last
59 ;;
60 #else
61 // Optimized for McKinley
62 1: stf.spill.nta [dst1] = f0, 64
63 stf.spill.nta [dst2] = f0, 64
64 stf.spill.nta [dst3] = f0, 64
65 stf.spill.nta [dst4] = f0, 128
66 cmp.lt p8,p0=dst_fetch, dst_last
67 ;;
68 stf.spill.nta [dst1] = f0, 64
69 stf.spill.nta [dst2] = f0, 64
70 #endif
71 stf.spill.nta [dst3] = f0, 64
72 (p8) stf.spill.nta [dst_fetch] = f0, L3_LINE_SIZE
73 br.cloop.sptk.few 1b
74 ;;
75 mov ar.lc = saved_lc // restore lc
76 br.ret.sptk.many rp
77 END(clear_page)