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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/x86/include/asm/timer.h |
Initial import
Diffstat (limited to 'arch/x86/include/asm/timer.h')
-rw-r--r-- | arch/x86/include/asm/timer.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/x86/include/asm/timer.h b/arch/x86/include/asm/timer.h new file mode 100644 index 000000000..a04eabd43 --- /dev/null +++ b/arch/x86/include/asm/timer.h @@ -0,0 +1,37 @@ +#ifndef _ASM_X86_TIMER_H +#define _ASM_X86_TIMER_H +#include <linux/pm.h> +#include <linux/percpu.h> +#include <linux/interrupt.h> +#include <linux/math64.h> + +#define TICK_SIZE (tick_nsec / 1000) + +unsigned long long native_sched_clock(void); +extern int recalibrate_cpu_khz(void); + +extern int no_timer_check; + +/* + * We use the full linear equation: f(x) = a + b*x, in order to allow + * a continuous function in the face of dynamic freq changes. + * + * Continuity means that when our frequency changes our slope (b); we want to + * ensure that: f(t) == f'(t), which gives: a + b*t == a' + b'*t. + * + * Without an offset (a) the above would not be possible. + * + * See the comment near cycles_2_ns() for details on how we compute (b). + */ +struct cyc2ns_data { + u32 cyc2ns_mul; + u32 cyc2ns_shift; + u64 cyc2ns_offset; + u32 __count; + /* u32 hole */ +}; /* 24 bytes -- do not grow */ + +extern struct cyc2ns_data *cyc2ns_read_begin(void); +extern void cyc2ns_read_end(struct cyc2ns_data *); + +#endif /* _ASM_X86_TIMER_H */ |