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authorLinus Torvalds <torvalds@linux-foundation.org>2008-10-23 13:22:01 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-23 13:22:01 -0400
commit5b34653963de7a6d0d8c783527457d68fddc60fb (patch)
tree1a234741e1823a54cd0514616f783b4cf503a528 /include/asm-x86/timer.h
parent765426e8ee4c0ab2bc9d44951f4865b8494cdbd0 (diff)
parent5e1b00758b5a8bee9d42515bffdaf305a32f1b04 (diff)
Merge branch 'x86/um-header' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86/um-header' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (26 commits) x86: canonicalize remaining header guards x86: drop double underscores from header guards x86: Fix ASM_X86__ header guards x86, um: get rid of uml-config.h x86, um: get rid of arch/um/Kconfig.arch x86, um: get rid of arch/um/os symlink x86, um: get rid of excessive includes of uml-config.h x86, um: get rid of header symlinks x86, um: merge Kconfig.i386 and Kconfig.x86_64 x86, um: get rid of sysdep symlink x86, um: trim the junk from uml ptrace-*.h x86, um: take vm-flags.h to sysdep x86, um: get rid of uml asm/arch x86, um: get rid of uml highmem.h x86, um: get rid of uml unistd.h x86, um: get rid of system.h -> system.h include x86, um: uml atomic.h is not needed anymore x86, um: untangle uml ldt.h x86, um: get rid of more uml asm/arch uses x86, um: remove dead header (uml module-generic.h; never used these days) ...
Diffstat (limited to 'include/asm-x86/timer.h')
-rw-r--r--include/asm-x86/timer.h66
1 files changed, 0 insertions, 66 deletions
diff --git a/include/asm-x86/timer.h b/include/asm-x86/timer.h
deleted file mode 100644
index d0babce4b47a..000000000000
--- a/include/asm-x86/timer.h
+++ /dev/null
@@ -1,66 +0,0 @@
1#ifndef ASM_X86__TIMER_H
2#define ASM_X86__TIMER_H
3#include <linux/init.h>
4#include <linux/pm.h>
5#include <linux/percpu.h>
6
7#define TICK_SIZE (tick_nsec / 1000)
8
9unsigned long long native_sched_clock(void);
10unsigned long native_calibrate_tsc(void);
11
12#ifdef CONFIG_X86_32
13extern int timer_ack;
14extern int recalibrate_cpu_khz(void);
15#endif /* CONFIG_X86_32 */
16
17extern int no_timer_check;
18
19#ifndef CONFIG_PARAVIRT
20#define calibrate_tsc() native_calibrate_tsc()
21#endif
22
23/* Accelerators for sched_clock()
24 * convert from cycles(64bits) => nanoseconds (64bits)
25 * basic equation:
26 * ns = cycles / (freq / ns_per_sec)
27 * ns = cycles * (ns_per_sec / freq)
28 * ns = cycles * (10^9 / (cpu_khz * 10^3))
29 * ns = cycles * (10^6 / cpu_khz)
30 *
31 * Then we use scaling math (suggested by george@mvista.com) to get:
32 * ns = cycles * (10^6 * SC / cpu_khz) / SC
33 * ns = cycles * cyc2ns_scale / SC
34 *
35 * And since SC is a constant power of two, we can convert the div
36 * into a shift.
37 *
38 * We can use khz divisor instead of mhz to keep a better precision, since
39 * cyc2ns_scale is limited to 10^6 * 2^10, which fits in 32 bits.
40 * (mathieu.desnoyers@polymtl.ca)
41 *
42 * -johnstul@us.ibm.com "math is hard, lets go shopping!"
43 */
44
45DECLARE_PER_CPU(unsigned long, cyc2ns);
46
47#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */
48
49static inline unsigned long long __cycles_2_ns(unsigned long long cyc)
50{
51 return cyc * per_cpu(cyc2ns, smp_processor_id()) >> CYC2NS_SCALE_FACTOR;
52}
53
54static inline unsigned long long cycles_2_ns(unsigned long long cyc)
55{
56 unsigned long long ns;
57 unsigned long flags;
58
59 local_irq_save(flags);
60 ns = __cycles_2_ns(cyc);
61 local_irq_restore(flags);
62
63 return ns;
64}
65
66#endif /* ASM_X86__TIMER_H */