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[PATCH] Time: i386 Conversion - part 2: Rework TSC Support

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As part of the i386 conversion to the generic timekeeping infrastructure, this
introduces a new tsc.c file.  The code in this file replaces the TSC
initialization, management and access code currently in timer_tsc.c (which
will be removed) that we want to preserve.

The code also introduces the following functionality:

o tsc_khz: like cpu_khz but stores the TSC frequency on systems that do not
  change TSC frequency w/ CPU frequency

o check/mark_tsc_unstable: accessor/modifier flag for TSC timekeeping
  usability

o minor cleanups to calibration math.

This patch also includes a one line __cpuinitdata fix from Zwane Mwaikambo.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
john stultz
2006-06-26 00:25:10 -07:00
committed by Linus Torvalds
parent 8d016ef138
commit 539eb11e6e
10 changed files with 389 additions and 217 deletions
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9
drivers/acpi/processor_idle.c
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@@ -369,6 +369,11 @@ static void acpi_processor_idle(void)
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Get end time (ticks) */
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
#ifdef CONFIG_GENERIC_TIME
/* TSC halts in C2, so notify users */
mark_tsc_unstable();
#endif
/* Re-enable interrupts */
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
@@ -409,6 +414,10 @@ static void acpi_processor_idle(void)
ACPI_MTX_DO_NOT_LOCK);
}
#ifdef CONFIG_GENERIC_TIME
/* TSC halts in C3, so notify users */
mark_tsc_unstable();
#endif
/* Re-enable interrupts */
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);