Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/ia64/lib/clear_page.S
10817 views
1
/*

2
 * Copyright (C) 1999-2002 Hewlett-Packard Co

3
 *	Stephane Eranian <[email protected]>

4
 *	David Mosberger-Tang <[email protected]>

5
 * Copyright (C) 2002 Ken Chen <[email protected]>

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


12
#include <asm/asmmacro.h>

13
#include <asm/page.h>

14


15
#ifdef CONFIG_ITANIUM

16
# define L3_LINE_SIZE	64	// Itanium L3 line size

17
# define PREFETCH_LINES	9	// magic number

18
#else

19
# define L3_LINE_SIZE	128	// McKinley L3 line size

20
# define PREFETCH_LINES	12	// magic number

21
#endif

22


23
#define saved_lc	r2

24
#define dst_fetch	r3

25
#define dst1		r8

26
#define dst2		r9

27
#define dst3		r10

28
#define dst4		r11

29


30
#define dst_last	r31

31


32
GLOBAL_ENTRY(clear_page)

33
	.prologue

34
	.regstk 1,0,0,0

35
	mov r16 = PAGE_SIZE/L3_LINE_SIZE-1	// main loop count, -1=repeat/until

36
	.save ar.lc, saved_lc

37
	mov saved_lc = ar.lc

38


39
	.body

40
	mov ar.lc = (PREFETCH_LINES - 1)

41
	mov dst_fetch = in0

42
	adds dst1 = 16, in0

43
	adds dst2 = 32, in0

44
	;;

45
.fetch:	stf.spill.nta [dst_fetch] = f0, L3_LINE_SIZE

46
	adds dst3 = 48, in0		// executing this multiple times is harmless

47
	br.cloop.sptk.few .fetch

48
	;;

49
	addl dst_last = (PAGE_SIZE - PREFETCH_LINES*L3_LINE_SIZE), dst_fetch

50
	mov ar.lc = r16			// one L3 line per iteration

51
	adds dst4 = 64, in0

52
	;;

53
#ifdef CONFIG_ITANIUM

54
	// Optimized for Itanium

55
1:	stf.spill.nta [dst1] = f0, 64

56
	stf.spill.nta [dst2] = f0, 64

57
	cmp.lt p8,p0=dst_fetch, dst_last

58
	;;

59
#else

60
	// Optimized for McKinley

61
1:	stf.spill.nta [dst1] = f0, 64

62
	stf.spill.nta [dst2] = f0, 64

63
	stf.spill.nta [dst3] = f0, 64

64
	stf.spill.nta [dst4] = f0, 128

65
	cmp.lt p8,p0=dst_fetch, dst_last

66
	;;

67
	stf.spill.nta [dst1] = f0, 64

68
	stf.spill.nta [dst2] = f0, 64

69
#endif

70
	stf.spill.nta [dst3] = f0, 64

71
(p8)	stf.spill.nta [dst_fetch] = f0, L3_LINE_SIZE

72
	br.cloop.sptk.few 1b

73
	;;

74
	mov ar.lc = saved_lc		// restore lc

75
	br.ret.sptk.many rp

76
END(clear_page)

77


78