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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-ia64/] [delay.h] - Blame information for rev 1774

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#ifndef _ASM_IA64_DELAY_H
#define _ASM_IA64_DELAY_H
 
/*
 * Delay routines using a pre-computed "cycles/usec" value.
 *
 * Copyright (C) 1998, 1999 Hewlett-Packard Co
 * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
 */
 
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
 
#include <asm/processor.h>
 
static __inline__ void
ia64_set_itm (unsigned long val)
{
        __asm__ __volatile__("mov cr.itm=%0;; srlz.d;;" :: "r"(val) : "memory");
}
 
static __inline__ unsigned long
ia64_get_itm (void)
{
        unsigned long result;
 
        __asm__ __volatile__("mov %0=cr.itm;; srlz.d;;" : "=r"(result) :: "memory");
        return result;
}
 
static __inline__ void
ia64_set_itv (unsigned long val)
{
        __asm__ __volatile__("mov cr.itv=%0;; srlz.d;;" :: "r"(val) : "memory");
}
 
static __inline__ void
ia64_set_itc (unsigned long val)
{
        __asm__ __volatile__("mov ar.itc=%0;; srlz.d;;" :: "r"(val) : "memory");
}
 
static __inline__ unsigned long
ia64_get_itc (void)
{
        unsigned long result;
 
        __asm__ __volatile__("mov %0=ar.itc" : "=r"(result) :: "memory");
#ifdef CONFIG_ITANIUM
        while (__builtin_expect ((__s32) result == -1, 0))
                __asm__ __volatile__("mov %0=ar.itc" : "=r"(result) :: "memory");
#endif
        return result;
}
 
static __inline__ void
__delay (unsigned long loops)
{
        unsigned long saved_ar_lc;
 
        if (loops < 1)
                return;
 
        __asm__ __volatile__("mov %0=ar.lc;;" : "=r"(saved_ar_lc));
        __asm__ __volatile__("mov ar.lc=%0;;" :: "r"(loops - 1));
        __asm__ __volatile__("1:\tbr.cloop.sptk.few 1b;;");
        __asm__ __volatile__("mov ar.lc=%0" :: "r"(saved_ar_lc));
}
 
static __inline__ void
udelay (unsigned long usecs)
{
        unsigned long start = ia64_get_itc();
        unsigned long cycles = usecs*local_cpu_data->cyc_per_usec;
 
        while (ia64_get_itc() - start < cycles)
                /* skip */;
}
 
static __inline__ void
ndelay (unsigned long nsecs)
{
        unsigned long start = ia64_get_itc();
        unsigned long cycles = nsecs*local_cpu_data->cyc_per_usec/1000;
 
        while (ia64_get_itc() - start < cycles)
                /* skip */;
}
 
#endif /* _ASM_IA64_DELAY_H */

Line No.	Rev	Author	Line
1	1275	phoenix	`#ifndef _ASM_IA64_DELAY_H`
2			`#define _ASM_IA64_DELAY_H`
3
4			`/*`
5			`* Delay routines using a pre-computed "cycles/usec" value.`
6			`*`
7			`* Copyright (C) 1998, 1999 Hewlett-Packard Co`
8			`* Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>`
9			`* Copyright (C) 1999 VA Linux Systems`
10			`* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>`
11			`* Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>`
12			`* Copyright (C) 1999 Don Dugger <don.dugger@intel.com>`
13			`*/`
14
15			`#include <linux/config.h>`
16			`#include <linux/kernel.h>`
17			`#include <linux/sched.h>`
18
19			`#include <asm/processor.h>`
20
21			`static __inline__ void`
22			`ia64_set_itm (unsigned long val)`
23			`{`
24			`__asm__ __volatile__("mov cr.itm=%0;; srlz.d;;" :: "r"(val) : "memory");`
25			`}`
26
27			`static __inline__ unsigned long`
28			`ia64_get_itm (void)`
29			`{`
30			`unsigned long result;`
31
32			`__asm__ __volatile__("mov %0=cr.itm;; srlz.d;;" : "=r"(result) :: "memory");`
33			`return result;`
34			`}`
35
36			`static __inline__ void`
37			`ia64_set_itv (unsigned long val)`
38			`{`
39			`__asm__ __volatile__("mov cr.itv=%0;; srlz.d;;" :: "r"(val) : "memory");`
40			`}`
41
42			`static __inline__ void`
43			`ia64_set_itc (unsigned long val)`
44			`{`
45			`__asm__ __volatile__("mov ar.itc=%0;; srlz.d;;" :: "r"(val) : "memory");`
46			`}`
47
48			`static __inline__ unsigned long`
49			`ia64_get_itc (void)`
50			`{`
51			`unsigned long result;`
52
53			`__asm__ __volatile__("mov %0=ar.itc" : "=r"(result) :: "memory");`
54			`#ifdef CONFIG_ITANIUM`
55			`while (__builtin_expect ((__s32) result == -1, 0))`
56			`__asm__ __volatile__("mov %0=ar.itc" : "=r"(result) :: "memory");`
57			`#endif`
58			`return result;`
59			`}`
60
61			`static __inline__ void`
62			`__delay (unsigned long loops)`
63			`{`
64			`unsigned long saved_ar_lc;`
65
66			`if (loops < 1)`
67			`return;`
68
69			`__asm__ __volatile__("mov %0=ar.lc;;" : "=r"(saved_ar_lc));`
70			`__asm__ __volatile__("mov ar.lc=%0;;" :: "r"(loops - 1));`
71			`__asm__ __volatile__("1:\tbr.cloop.sptk.few 1b;;");`
72			`__asm__ __volatile__("mov ar.lc=%0" :: "r"(saved_ar_lc));`
73			`}`
74
75			`static __inline__ void`
76			`udelay (unsigned long usecs)`
77			`{`
78			`unsigned long start = ia64_get_itc();`
79			`unsigned long cycles = usecs*local_cpu_data->cyc_per_usec;`
80
81			`while (ia64_get_itc() - start < cycles)`
82			`/* skip */;`
83			`}`
84
85			`static __inline__ void`
86			`ndelay (unsigned long nsecs)`
87			`{`
88			`unsigned long start = ia64_get_itc();`
89			`unsigned long cycles = nsecs*local_cpu_data->cyc_per_usec/1000;`
90
91			`while (ia64_get_itc() - start < cycles)`
92			`/* skip */;`
93			`}`
94
95			`#endif /* _ASM_IA64_DELAY_H */`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-ia64/] [delay.h] - Blame information for rev 1774