diff options
Diffstat (limited to 'arch/x86/lib/delay_64.c')
-rw-r--r-- | arch/x86/lib/delay_64.c | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/arch/x86/lib/delay_64.c b/arch/x86/lib/delay_64.c deleted file mode 100644 index 4c441be92641..000000000000 --- a/arch/x86/lib/delay_64.c +++ /dev/null | |||
@@ -1,85 +0,0 @@ | |||
1 | /* | ||
2 | * Precise Delay Loops for x86-64 | ||
3 | * | ||
4 | * Copyright (C) 1993 Linus Torvalds | ||
5 | * Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz> | ||
6 | * | ||
7 | * The __delay function must _NOT_ be inlined as its execution time | ||
8 | * depends wildly on alignment on many x86 processors. | ||
9 | */ | ||
10 | |||
11 | #include <linux/module.h> | ||
12 | #include <linux/sched.h> | ||
13 | #include <linux/timex.h> | ||
14 | #include <linux/preempt.h> | ||
15 | #include <linux/delay.h> | ||
16 | #include <linux/init.h> | ||
17 | |||
18 | #include <asm/delay.h> | ||
19 | #include <asm/msr.h> | ||
20 | |||
21 | #ifdef CONFIG_SMP | ||
22 | #include <asm/smp.h> | ||
23 | #endif | ||
24 | |||
25 | int __devinit read_current_timer(unsigned long *timer_value) | ||
26 | { | ||
27 | rdtscll(*timer_value); | ||
28 | return 0; | ||
29 | } | ||
30 | |||
31 | void __delay(unsigned long loops) | ||
32 | { | ||
33 | unsigned bclock, now; | ||
34 | int cpu; | ||
35 | |||
36 | preempt_disable(); | ||
37 | cpu = smp_processor_id(); | ||
38 | rdtscl(bclock); | ||
39 | for (;;) { | ||
40 | rdtscl(now); | ||
41 | if ((now - bclock) >= loops) | ||
42 | break; | ||
43 | |||
44 | /* Allow RT tasks to run */ | ||
45 | preempt_enable(); | ||
46 | rep_nop(); | ||
47 | preempt_disable(); | ||
48 | |||
49 | /* | ||
50 | * It is possible that we moved to another CPU, and | ||
51 | * since TSC's are per-cpu we need to calculate | ||
52 | * that. The delay must guarantee that we wait "at | ||
53 | * least" the amount of time. Being moved to another | ||
54 | * CPU could make the wait longer but we just need to | ||
55 | * make sure we waited long enough. Rebalance the | ||
56 | * counter for this CPU. | ||
57 | */ | ||
58 | if (unlikely(cpu != smp_processor_id())) { | ||
59 | loops -= (now - bclock); | ||
60 | cpu = smp_processor_id(); | ||
61 | rdtscl(bclock); | ||
62 | } | ||
63 | } | ||
64 | preempt_enable(); | ||
65 | } | ||
66 | EXPORT_SYMBOL(__delay); | ||
67 | |||
68 | inline void __const_udelay(unsigned long xloops) | ||
69 | { | ||
70 | __delay(((xloops * HZ * | ||
71 | cpu_data(raw_smp_processor_id()).loops_per_jiffy) >> 32) + 1); | ||
72 | } | ||
73 | EXPORT_SYMBOL(__const_udelay); | ||
74 | |||
75 | void __udelay(unsigned long usecs) | ||
76 | { | ||
77 | __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */ | ||
78 | } | ||
79 | EXPORT_SYMBOL(__udelay); | ||
80 | |||
81 | void __ndelay(unsigned long nsecs) | ||
82 | { | ||
83 | __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */ | ||
84 | } | ||
85 | EXPORT_SYMBOL(__ndelay); | ||