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| author | Keir Fraser <keir.fraser@citrix.com> | 2008-07-21 09:46:17 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2008-07-21 09:46:17 +0100 |
| commit | d84cb0723cbab44f52f553ca8769bd72b57325ed (patch) | |
| tree | 6fe2b4c007402ceb1aa248d92f655bcaa53775e2 | |
| parent | 9829c9f3ec5266b57cd01d2a93451480186d0658 (diff) | |
| download | xen-d84cb0723cbab44f52f553ca8769bd72b57325ed.tar.gz xen-d84cb0723cbab44f52f553ca8769bd72b57325ed.tar.bz2 xen-d84cb0723cbab44f52f553ca8769bd72b57325ed.zip | |
x86: More accurate PIT frequency estimation (1193182Hz)
In practice this has no impact since variance between crystals will be
substantially greater than 1-2ppm. But we may as well be as accurate
as possible.
From: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
| -rw-r--r-- | xen/arch/x86/i8259.c | 2 | ||||
| -rw-r--r-- | xen/arch/x86/time.c | 2 | ||||
| -rw-r--r-- | xen/include/asm-x86/hvm/vpt.h | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/xen/arch/x86/i8259.c b/xen/arch/x86/i8259.c index 815e9e57f3..525bf1720e 100644 --- a/xen/arch/x86/i8259.c +++ b/xen/arch/x86/i8259.c @@ -411,7 +411,7 @@ void __init init_IRQ(void) apic_intr_init(); /* Set the clock to HZ Hz */ -#define CLOCK_TICK_RATE 1193180 /* crystal freq (Hz) */ +#define CLOCK_TICK_RATE 1193182 /* crystal freq (Hz) */ #define LATCH (((CLOCK_TICK_RATE)+(HZ/2))/HZ) outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ outb_p(LATCH & 0xff, PIT_CH0); /* LSB */ diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c index 24df5bcbe4..24bd8f8acb 100644 --- a/xen/arch/x86/time.c +++ b/xen/arch/x86/time.c @@ -214,7 +214,7 @@ static struct irqaction irq0 = { timer_interrupt, "timer", NULL }; * Return processor ticks per second / CALIBRATE_FRAC. */ -#define CLOCK_TICK_RATE 1193180 /* system crystal frequency (Hz) */ +#define CLOCK_TICK_RATE 1193182 /* system crystal frequency (Hz) */ #define CALIBRATE_FRAC 20 /* calibrate over 50ms */ #define CALIBRATE_LATCH ((CLOCK_TICK_RATE+(CALIBRATE_FRAC/2))/CALIBRATE_FRAC) diff --git a/xen/include/asm-x86/hvm/vpt.h b/xen/include/asm-x86/hvm/vpt.h index db58653411..b43f5aea2e 100644 --- a/xen/include/asm-x86/hvm/vpt.h +++ b/xen/include/asm-x86/hvm/vpt.h @@ -95,7 +95,7 @@ struct periodic_time { }; -#define PIT_FREQ 1193181 +#define PIT_FREQ 1193182 #define PIT_BASE 0x40 typedef struct PITState { |