diff options
Diffstat (limited to 'arch/x86/kernel/time_64.c')
| -rw-r--r-- | arch/x86/kernel/time_64.c | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c index 7db3912b869..78cbdf5c006 100644 --- a/arch/x86/kernel/time_64.c +++ b/arch/x86/kernel/time_64.c @@ -23,7 +23,13 @@ #include <asm/time.h> #include <asm/nmi.h> +#if defined(CONFIG_X86_32) && defined(CONFIG_X86_IO_APIC) +int timer_ack; +#endif + +#ifdef CONFIG_X86_64 volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES; +#endif unsigned long profile_pc(struct pt_regs *regs) { @@ -47,8 +53,12 @@ unsigned long profile_pc(struct pt_regs *regs) } EXPORT_SYMBOL(profile_pc); +/* + * Default timer interrupt handler for PIT/HPET + */ static irqreturn_t timer_interrupt(int irq, void *dev_id) { + /* Keep nmi watchdog up to date */ inc_irq_stat(irq0_irqs); /* Optimized out for !IO_APIC and x86_64 */ @@ -74,8 +84,10 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } -/* calibrate_cpu is used on systems with fixed rate TSCs to determine - * processor frequency */ +/* + * calibrate_cpu is used on systems with fixed rate TSCs to determine + * processor frequency + */ #define TICK_COUNT 100000000 unsigned long __init calibrate_cpu(void) { @@ -122,18 +134,24 @@ unsigned long __init calibrate_cpu(void) return pmc_now * tsc_khz / (tsc_now - tsc_start); } -static struct irqaction irq0 = { - .handler = timer_interrupt, - .flags = IRQF_DISABLED | IRQF_IRQPOLL | IRQF_NOBALANCING | IRQF_TIMER, - .name = "timer" +static struct irqaction irq0 = { + .handler = timer_interrupt, + .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER, + .name = "timer" }; +void __init setup_default_timer_irq(void) +{ + irq0.mask = cpumask_of_cpu(0); + setup_irq(0, &irq0); +} + +/* Default timer init function */ void __init hpet_time_init(void) { if (!hpet_enable()) setup_pit_timer(); - - setup_irq(0, &irq0); + setup_default_timer_irq(); } static void x86_late_time_init(void) @@ -141,6 +159,10 @@ static void x86_late_time_init(void) x86_init.timers.timer_init(); } +/* + * Initialize TSC and delay the periodic timer init to + * late x86_late_time_init() so ioremap works. + */ void __init time_init(void) { tsc_init(); |