diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/Makefile_32 | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/Makefile_64 | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/apic_64.c | 106 | ||||
| -rw-r--r-- | arch/x86/kernel/hpet.c (renamed from arch/x86/kernel/hpet_32.c) | 0 | ||||
| -rw-r--r-- | arch/x86/kernel/hpet_64.c | 444 | ||||
| -rw-r--r-- | arch/x86/kernel/i8253.c (renamed from arch/x86/kernel/i8253_32.c) | 0 | ||||
| -rw-r--r-- | arch/x86/kernel/time_64.c | 42 |
7 files changed, 5 insertions, 595 deletions
diff --git a/arch/x86/kernel/Makefile_32 b/arch/x86/kernel/Makefile_32 index 10356443998e..7ff02063b858 100644 --- a/arch/x86/kernel/Makefile_32 +++ b/arch/x86/kernel/Makefile_32 @@ -7,7 +7,7 @@ extra-y := head_32.o init_task_32.o vmlinux.lds obj-y := process_32.o signal_32.o entry_32.o traps_32.o irq_32.o \ ptrace_32.o time_32.o ioport_32.o ldt_32.o setup_32.o i8259_32.o sys_i386_32.o \ pci-dma_32.o i386_ksyms_32.o i387_32.o bootflag.o e820_32.o\ - quirks.o i8237.o topology.o alternative.o i8253_32.o tsc_32.o + quirks.o i8237.o topology.o alternative.o i8253.o tsc_32.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += cpu/ @@ -37,7 +37,7 @@ obj-$(CONFIG_EFI) += efi_32.o efi_stub_32.o obj-$(CONFIG_DOUBLEFAULT) += doublefault_32.o obj-$(CONFIG_VM86) += vm86_32.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o -obj-$(CONFIG_HPET_TIMER) += hpet_32.o +obj-$(CONFIG_HPET_TIMER) += hpet.o obj-$(CONFIG_K8_NB) += k8.o obj-$(CONFIG_MGEODE_LX) += geode_32.o mfgpt_32.o diff --git a/arch/x86/kernel/Makefile_64 b/arch/x86/kernel/Makefile_64 index 080154e31502..43da66213a47 100644 --- a/arch/x86/kernel/Makefile_64 +++ b/arch/x86/kernel/Makefile_64 @@ -8,8 +8,8 @@ obj-y := process_64.o signal_64.o entry_64.o traps_64.o irq_64.o \ ptrace_64.o time_64.o ioport_64.o ldt_64.o setup_64.o i8259_64.o sys_x86_64.o \ x8664_ksyms_64.o i387_64.o syscall_64.o vsyscall_64.o \ setup64.o bootflag.o e820_64.o reboot_64.o quirks.o i8237.o \ - pci-dma_64.o pci-nommu_64.o alternative.o hpet_32.o tsc_64.o bugs_64.o \ - perfctr-watchdog.o i8253_32.o + pci-dma_64.o pci-nommu_64.o alternative.o hpet.o tsc_64.o bugs_64.o \ + perfctr-watchdog.o i8253.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-$(CONFIG_X86_MCE) += mce_64.o therm_throt.o diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c index 118830cba1ae..1231365404c4 100644 --- a/arch/x86/kernel/apic_64.c +++ b/arch/x86/kernel/apic_64.c @@ -41,7 +41,6 @@ #include <asm/apic.h> int apic_verbosity; -int apic_runs_main_timer; int apic_calibrate_pmtmr __initdata; int disable_apic_timer __cpuinitdata; @@ -129,15 +128,6 @@ static void lapic_timer_broadcast(cpumask_t mask) #endif } -/* - * cpu_mask that denotes the CPUs that needs timer interrupt coming in as - * IPIs in place of local APIC timers - */ -static cpumask_t timer_interrupt_broadcast_ipi_mask; - -/* Using APIC to generate smp_local_timer_interrupt? */ -int using_apic_timer __read_mostly = 0; - static void apic_pm_activate(void); void apic_wait_icr_idle(void) @@ -973,84 +963,6 @@ void __cpuinit setup_secondary_APIC_clock(void) setup_APIC_timer(); } -void disable_APIC_timer(void) -{ - if (using_apic_timer) { - unsigned long v; - - v = apic_read(APIC_LVTT); - /* - * When an illegal vector value (0-15) is written to an LVT - * entry and delivery mode is Fixed, the APIC may signal an - * illegal vector error, with out regard to whether the mask - * bit is set or whether an interrupt is actually seen on input. - * - * Boot sequence might call this function when the LVTT has - * '0' vector value. So make sure vector field is set to - * valid value. - */ - v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); - apic_write(APIC_LVTT, v); - } -} - -void enable_APIC_timer(void) -{ - int cpu = smp_processor_id(); - - if (using_apic_timer && - !cpu_isset(cpu, timer_interrupt_broadcast_ipi_mask)) { - unsigned long v; - - v = apic_read(APIC_LVTT); - apic_write(APIC_LVTT, v & ~APIC_LVT_MASKED); - } -} - -void switch_APIC_timer_to_ipi(void *cpumask) -{ - cpumask_t mask = *(cpumask_t *)cpumask; - int cpu = smp_processor_id(); - - if (cpu_isset(cpu, mask) && - !cpu_isset(cpu, timer_interrupt_broadcast_ipi_mask)) { - disable_APIC_timer(); - cpu_set(cpu, timer_interrupt_broadcast_ipi_mask); - } -} -EXPORT_SYMBOL(switch_APIC_timer_to_ipi); - -void smp_send_timer_broadcast_ipi(void) -{ - int cpu = smp_processor_id(); - cpumask_t mask; - - cpus_and(mask, cpu_online_map, timer_interrupt_broadcast_ipi_mask); - - if (cpu_isset(cpu, mask)) { - cpu_clear(cpu, mask); - add_pda(apic_timer_irqs, 1); - smp_local_timer_interrupt(); - } - - if (!cpus_empty(mask)) { - send_IPI_mask(mask, LOCAL_TIMER_VECTOR); - } -} - -void switch_ipi_to_APIC_timer(void *cpumask) -{ - cpumask_t mask = *(cpumask_t *)cpumask; - int cpu = smp_processor_id(); - - if (cpu_isset(cpu, mask) && - cpu_isset(cpu, timer_interrupt_broadcast_ipi_mask)) { - cpu_clear(cpu, timer_interrupt_broadcast_ipi_mask); - enable_APIC_timer(); - } -} -EXPORT_SYMBOL(switch_ipi_to_APIC_timer); - int setup_profiling_timer(unsigned int multiplier) { return -EINVAL; @@ -1297,21 +1209,7 @@ static __init int setup_noapictimer(char *str) disable_apic_timer = 1; return 1; } - -static __init int setup_apicmaintimer(char *str) -{ - apic_runs_main_timer = 1; - - return 1; -} -__setup("apicmaintimer", setup_apicmaintimer); - -static __init int setup_noapicmaintimer(char *str) -{ - apic_runs_main_timer = -1; - return 1; -} -__setup("noapicmaintimer", setup_noapicmaintimer); +__setup("noapictimer", setup_noapictimer); static __init int setup_apicpmtimer(char *s) { @@ -1321,5 +1219,3 @@ static __init int setup_apicpmtimer(char *s) } __setup("apicpmtimer", setup_apicpmtimer); -__setup("noapictimer", setup_noapictimer); - diff --git a/arch/x86/kernel/hpet_32.c b/arch/x86/kernel/hpet.c index dbe0e1d44113..dbe0e1d44113 100644 --- a/arch/x86/kernel/hpet_32.c +++ b/arch/x86/kernel/hpet.c diff --git a/arch/x86/kernel/hpet_64.c b/arch/x86/kernel/hpet_64.c deleted file mode 100644 index 1ebce2ec7eaf..000000000000 --- a/arch/x86/kernel/hpet_64.c +++ /dev/null @@ -1,444 +0,0 @@ -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/init.h> -#include <linux/mc146818rtc.h> -#include <linux/time.h> -#include <linux/clocksource.h> -#include <linux/ioport.h> -#include <linux/acpi.h> -#include <linux/hpet.h> -#include <asm/pgtable.h> -#include <asm/vsyscall.h> -#include <asm/timex.h> -#include <asm/hpet.h> - -#define HPET_MASK 0xFFFFFFFF -#define HPET_SHIFT 22 - -/* FSEC = 10^-15 NSEC = 10^-9 */ -#define FSEC_PER_NSEC 1000000 - -int nohpet __initdata; - -unsigned long hpet_address; -unsigned long hpet_period; /* fsecs / HPET clock */ -unsigned long hpet_tick; /* HPET clocks / interrupt */ - -int hpet_use_timer; /* Use counter of hpet for time keeping, - * otherwise PIT - */ - -#ifdef CONFIG_HPET -static __init int late_hpet_init(void) -{ - struct hpet_data hd; - unsigned int ntimer; - - if (!hpet_address) - return 0; - - memset(&hd, 0, sizeof(hd)); - - ntimer = hpet_readl(HPET_ID); - ntimer = (ntimer & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT; - ntimer++; - - /* - * Register with driver. - * Timer0 and Timer1 is used by platform. - */ - hd.hd_phys_address = hpet_address; - hd.hd_address = (void __iomem *)fix_to_virt(FIX_HPET_BASE); - hd.hd_nirqs = ntimer; - hd.hd_flags = HPET_DATA_PLATFORM; - hpet_reserve_timer(&hd, 0); -#ifdef CONFIG_HPET_EMULATE_RTC - hpet_reserve_timer(&hd, 1); -#endif - hd.hd_irq[0] = HPET_LEGACY_8254; - hd.hd_irq[1] = HPET_LEGACY_RTC; - if (ntimer > 2) { - struct hpet *hpet; - struct hpet_timer *timer; - int i; - - hpet = (struct hpet *) fix_to_virt(FIX_HPET_BASE); - timer = &hpet->hpet_timers[2]; - for (i = 2; i < ntimer; timer++, i++) - hd.hd_irq[i] = (timer->hpet_config & - Tn_INT_ROUTE_CNF_MASK) >> - Tn_INT_ROUTE_CNF_SHIFT; - - } - - hpet_alloc(&hd); - return 0; -} -fs_initcall(late_hpet_init); -#endif - -int hpet_timer_stop_set_go(unsigned long tick) -{ - unsigned int cfg; - -/* - * Stop the timers and reset the main counter. - */ - - cfg = hpet_readl(HPET_CFG); - cfg &= ~(HPET_CFG_ENABLE | HPET_CFG_LEGACY); - hpet_writel(cfg, HPET_CFG); - hpet_writel(0, HPET_COUNTER); - hpet_writel(0, HPET_COUNTER + 4); - -/* - * Set up timer 0, as periodic with first interrupt to happen at hpet_tick, - * and period also hpet_tick. - */ - if (hpet_use_timer) { - hpet_writel(HPET_TN_ENABLE | HPET_TN_PERIODIC | HPET_TN_SETVAL | - HPET_TN_32BIT, HPET_T0_CFG); - hpet_writel(hpet_tick, HPET_T0_CMP); /* next interrupt */ - hpet_writel(hpet_tick, HPET_T0_CMP); /* period */ - cfg |= HPET_CFG_LEGACY; - } -/* - * Go! - */ - - cfg |= HPET_CFG_ENABLE; - hpet_writel(cfg, HPET_CFG); - - return 0; -} - -static cycle_t read_hpet(void) -{ - return (cycle_t)hpet_readl(HPET_COUNTER); -} - -static cycle_t __vsyscall_fn vread_hpet(void) -{ - return readl((void __iomem *)fix_to_virt(VSYSCALL_HPET) + 0xf0); -} - -struct clocksource clocksource_hpet = { - .name = "hpet", - .rating = 250, - .read = read_hpet, - .mask = (cycle_t)HPET_MASK, - .mult = 0, /* set below */ - .shift = HPET_SHIFT, - .flags = CLOCK_SOURCE_IS_CONTINUOUS, - .vread = vread_hpet, -}; - -int __init hpet_arch_init(void) -{ - unsigned int id; - u64 tmp; - - if (!hpet_address) - return -1; - set_fixmap_nocache(FIX_HPET_BASE, hpet_address); - __set_fixmap(VSYSCALL_HPET, hpet_address, PAGE_KERNEL_VSYSCALL_NOCACHE); - -/* - * Read the period, compute tick and quotient. - */ - - id = hpet_readl(HPET_ID); - - if (!(id & HPET_ID_VENDOR) || !(id & HPET_ID_NUMBER)) - return -1; - - hpet_period = hpet_readl(HPET_PERIOD); - if (hpet_period < 100000 || hpet_period > 100000000) - return -1; - - hpet_tick = (FSEC_PER_TICK + hpet_period / 2) / hpet_period; - - hpet_use_timer = (id & HPET_ID_LEGSUP); - - /* - * hpet period is in femto seconds per cycle - * so we need to convert this to ns/cyc units - * aproximated by mult/2^shift - * - * fsec/cyc * 1nsec/1000000fsec = nsec/cyc = mult/2^shift - * fsec/cyc * 1ns/1000000fsec * 2^shift = mult - * fsec/cyc * 2^shift * 1nsec/1000000fsec = mult - * (fsec/cyc << shift)/1000000 = mult - * (hpet_period << shift)/FSEC_PER_NSEC = mult - */ - tmp = (u64)hpet_period << HPET_SHIFT; - do_div(tmp, FSEC_PER_NSEC); - clocksource_hpet.mult = (u32)tmp; - clocksource_register(&clocksource_hpet); - - return hpet_timer_stop_set_go(hpet_tick); -} - -int hpet_reenable(void) -{ - return hpet_timer_stop_set_go(hpet_tick); -} - -#ifdef CONFIG_HPET_EMULATE_RTC -/* HPET in LegacyReplacement Mode eats up RTC interrupt line. When, HPET - * is enabled, we support RTC interrupt functionality in software. - * RTC has 3 kinds of interrupts: - * 1) Update Interrupt - generate an interrupt, every sec, when RTC clock - * is updated - * 2) Alarm Interrupt - generate an interrupt at a specific time of day - * 3) Periodic Interrupt - generate periodic interrupt, with frequencies - * 2Hz-8192Hz (2Hz-64Hz for non-root user) (all freqs in powers of 2) - * (1) and (2) above are implemented using polling at a frequency of - * 64 Hz. The exact frequency is a tradeoff between accuracy and interrupt - * overhead. (DEFAULT_RTC_INT_FREQ) - * For (3), we use interrupts at 64Hz or user specified periodic - * frequency, whichever is higher. - */ -#include <linux/rtc.h> - -#define DEFAULT_RTC_INT_FREQ 64 -#define RTC_NUM_INTS 1 - -static unsigned long UIE_on; -static unsigned long prev_update_sec; - -static unsigned long AIE_on; -static struct rtc_time alarm_time; - -static unsigned long PIE_on; -static unsigned long PIE_freq = DEFAULT_RTC_INT_FREQ; -static unsigned long PIE_count; - -static unsigned long hpet_rtc_int_freq; /* RTC interrupt frequency */ -static unsigned int hpet_t1_cmp; /* cached comparator register */ - -int is_hpet_enabled(void) -{ - return hpet_address != 0; -} - -/* - * Timer 1 for RTC, we do not use periodic interrupt feature, - * even if HPET supports periodic interrupts on Timer 1. - * The reason being, to set up a periodic interrupt in HPET, we need to - * stop the main counter. And if we do that everytime someone diables/enables - * RTC, we will have adverse effect on main kernel timer running on Timer 0. - * So, for the time being, simulate the periodic interrupt in software. - * - * hpet_rtc_timer_init() is called for the first time and during subsequent - * interuppts reinit happens through hpet_rtc_timer_reinit(). - */ -int hpet_rtc_timer_init(void) -{ - unsigned int cfg, cnt; - unsigned long flags; - - if (!is_hpet_enabled()) - return 0; - /* - * Set the counter 1 and enable the interrupts. - */ - if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ)) - hpet_rtc_int_freq = PIE_freq; - else - hpet_rtc_int_freq = DEFAULT_RTC_INT_FREQ; - - local_irq_save(flags); - - cnt = hpet_readl(HPET_COUNTER); - cnt += ((hpet_tick*HZ)/hpet_rtc_int_freq); - hpet_writel(cnt, HPET_T1_CMP); - hpet_t1_cmp = cnt; - - cfg = hpet_readl(HPET_T1_CFG); - cfg &= ~HPET_TN_PERIODIC; - cfg |= HPET_TN_ENABLE | HPET_TN_32BIT; - hpet_writel(cfg, HPET_T1_CFG); - - local_irq_restore(flags); - - return 1; -} - -static void hpet_rtc_timer_reinit(void) -{ - unsigned int cfg, cnt, ticks_per_int, lost_ints; - - if (unlikely(!(PIE_on | AIE_on | UIE_on))) { - cfg = hpet_readl(HPET_T1_CFG); - cfg &= ~HPET_TN_ENABLE; - hpet_writel(cfg, HPET_T1_CFG); - return; - } - - if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ)) - hpet_rtc_int_freq = PIE_freq; - else - hpet_rtc_int_freq = DEFAULT_RTC_INT_FREQ; - - /* It is more accurate to use the comparator value than current count.*/ - ticks_per_int = hpet_tick * HZ / hpet_rtc_int_freq; - hpet_t1_cmp += ticks_per_int; - hpet_writel(hpet_t1_cmp, HPET_T1_CMP); - - /* - * If the interrupt handler was delayed too long, the write above tries - * to schedule the next interrupt in the past and the hardware would - * not interrupt until the counter had wrapped around. - * So we have to check that the comparator wasn't set to a past time. - */ - cnt = hpet_readl(HPET_COUNTER); - if (unlikely((int)(cnt - hpet_t1_cmp) > 0)) { - lost_ints = (cnt - hpet_t1_cmp) / ticks_per_int + 1; - /* Make sure that, even with the time needed to execute - * this code, the next scheduled interrupt has been moved - * back to the future: */ - lost_ints++; - - hpet_t1_cmp += lost_ints * ticks_per_int; - hpet_writel(hpet_t1_cmp, HPET_T1_CMP); - - if (PIE_on) - PIE_count += lost_ints; - - if (printk_ratelimit()) - printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", - hpet_rtc_int_freq); - } -} - -/* - * The functions below are called from rtc driver. - * Return 0 if HPET is not being used. - * Otherwise do the necessary changes and return 1. - */ -int hpet_mask_rtc_irq_bit(unsigned long bit_mask) -{ - if (!is_hpet_enabled()) - return 0; - - if (bit_mask & RTC_UIE) - UIE_on = 0; - if (bit_mask & RTC_PIE) - PIE_on = 0; - if (bit_mask & RTC_AIE) - AIE_on = 0; - - return 1; -} - -int hpet_set_rtc_irq_bit(unsigned long bit_mask) -{ - int timer_init_reqd = 0; - - if (!is_hpet_enabled()) - return 0; - - if (!(PIE_on | AIE_on | UIE_on)) - timer_init_reqd = 1; - - if (bit_mask & RTC_UIE) { - UIE_on = 1; - } - if (bit_mask & RTC_PIE) { - PIE_on = 1; - PIE_count = 0; - } - if (bit_mask & RTC_AIE) { - AIE_on = 1; - } - - if (timer_init_reqd) - hpet_rtc_timer_init(); - - return 1; -} - -int hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec) -{ - if (!is_hpet_enabled()) - return 0; - - alarm_time.tm_hour = hrs; - alarm_time.tm_min = min; - alarm_time.tm_sec = sec; - - return 1; -} - -int hpet_set_periodic_freq(unsigned long freq) -{ - if (!is_hpet_enabled()) - return 0; - - PIE_freq = freq; - PIE_count = 0; - - return 1; -} - -int hpet_rtc_dropped_irq(void) -{ - if (!is_hpet_enabled()) - return 0; - - return 1; -} - -irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id) -{ - struct rtc_time curr_time; - unsigned long rtc_int_flag = 0; - int call_rtc_interrupt = 0; - - hpet_rtc_timer_reinit(); - - if (UIE_on | AIE_on) { - rtc_get_rtc_time(&curr_time); - } - if (UIE_on) { - if (curr_time.tm_sec != prev_update_sec) { - /* Set update int info, call real rtc int routine */ - call_rtc_interrupt = 1; - rtc_int_flag = RTC_UF; - prev_update_sec = curr_time.tm_sec; - } - } - if (PIE_on) { - PIE_count++; - if (PIE_count >= hpet_rtc_int_freq/PIE_freq) { - /* Set periodic int info, call real rtc int routine */ - call_rtc_interrupt = 1; - rtc_int_flag |= RTC_PF; - PIE_count = 0; - } - } - if (AIE_on) { - if ((curr_time.tm_sec == alarm_time.tm_sec) && - (curr_time.tm_min == alarm_time.tm_min) && - (curr_time.tm_hour == alarm_time.tm_hour)) { - /* Set alarm int info, call real rtc int routine */ - call_rtc_interrupt = 1; - rtc_int_flag |= RTC_AF; - } - } - if (call_rtc_interrupt) { - rtc_int_flag |= (RTC_IRQF | (RTC_NUM_INTS << 8)); - rtc_interrupt(rtc_int_flag, dev_id); - } - return IRQ_HANDLED; -} -#endif - -static int __init nohpet_setup(char *s) -{ - nohpet = 1; - return 1; -} - -__setup("nohpet", nohpet_setup); diff --git a/arch/x86/kernel/i8253_32.c b/arch/x86/kernel/i8253.c index ac15e4cbd9c1..ac15e4cbd9c1 100644 --- a/arch/x86/kernel/i8253_32.c +++ b/arch/x86/kernel/i8253.c diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c index aca081c37884..e0134d6c88da 100644 --- a/arch/x86/kernel/time_64.c +++ b/arch/x86/kernel/time_64.c @@ -150,48 +150,6 @@ int update_persistent_clock(struct timespec now) return set_rtc_mmss(now.tv_sec); } -void main_timer_handler(void) -{ -/* - * Here we are in the timer irq handler. We have irqs locally disabled (so we - * don't need spin_lock_irqsave()) but we don't know if the timer_bh is running - * on the other CPU, so we need a lock. We also need to lock the vsyscall - * variables, because both do_timer() and us change them -arca+vojtech - */ - - write_seqlock(&xtime_lock); - -/* - * Do the timer stuff. - */ - - do_timer(1); -#ifndef CONFIG_SMP - update_process_times(user_mode(get_irq_regs())); -#endif - -/* - * In the SMP case we use the local APIC timer interrupt to do the profiling, - * except when we simulate SMP mode on a uniprocessor system, in that case we - * have to call the local interrupt handler. - */ - - if (!using_apic_timer) - smp_local_timer_interrupt(); - - write_sequnlock(&xtime_lock); -} - -static irqreturn_t timer_interrupt(int irq, void *dev_id) -{ - if (apic_runs_main_timer > 1) - return IRQ_HANDLED; - main_timer_handler(); - if (using_apic_timer) - smp_send_timer_broadcast_ipi(); - return IRQ_HANDLED; -} - static irqreturn_t timer_event_interrupt(int irq, void *dev_id) { add_pda(irq0_irqs, 1); |