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Linux/arch/x86/kernel/time.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  Copyright (c) 1991,1992,1995  Linus Torvalds
  4  *  Copyright (c) 1994  Alan Modra
  5  *  Copyright (c) 1995  Markus Kuhn
  6  *  Copyright (c) 1996  Ingo Molnar
  7  *  Copyright (c) 1998  Andrea Arcangeli
  8  *  Copyright (c) 2002,2006  Vojtech Pavlik
  9  *  Copyright (c) 2003  Andi Kleen
 10  *
 11  */
 12 
 13 #include <linux/clocksource.h>
 14 #include <linux/clockchips.h>
 15 #include <linux/interrupt.h>
 16 #include <linux/irq.h>
 17 #include <linux/i8253.h>
 18 #include <linux/time.h>
 19 #include <linux/export.h>
 20 
 21 #include <asm/vsyscall.h>
 22 #include <asm/x86_init.h>
 23 #include <asm/i8259.h>
 24 #include <asm/timer.h>
 25 #include <asm/hpet.h>
 26 #include <asm/time.h>
 27 
 28 #ifdef CONFIG_X86_64
 29 __visible volatile unsigned long jiffies __cacheline_aligned_in_smp = INITIAL_JIFFIES;
 30 #endif
 31 
 32 unsigned long profile_pc(struct pt_regs *regs)
 33 {
 34         unsigned long pc = instruction_pointer(regs);
 35 
 36         if (!user_mode(regs) && in_lock_functions(pc)) {
 37 #ifdef CONFIG_FRAME_POINTER
 38                 return *(unsigned long *)(regs->bp + sizeof(long));
 39 #else
 40                 unsigned long *sp =
 41                         (unsigned long *)kernel_stack_pointer(regs);
 42                 /*
 43                  * Return address is either directly at stack pointer
 44                  * or above a saved flags. Eflags has bits 22-31 zero,
 45                  * kernel addresses don't.
 46                  */
 47                 if (sp[0] >> 22)
 48                         return sp[0];
 49                 if (sp[1] >> 22)
 50                         return sp[1];
 51 #endif
 52         }
 53         return pc;
 54 }
 55 EXPORT_SYMBOL(profile_pc);
 56 
 57 /*
 58  * Default timer interrupt handler for PIT/HPET
 59  */
 60 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 61 {
 62         global_clock_event->event_handler(global_clock_event);
 63         return IRQ_HANDLED;
 64 }
 65 
 66 static struct irqaction irq0  = {
 67         .handler = timer_interrupt,
 68         .flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
 69         .name = "timer"
 70 };
 71 
 72 static void __init setup_default_timer_irq(void)
 73 {
 74         /*
 75          * Unconditionally register the legacy timer; even without legacy
 76          * PIC/PIT we need this for the HPET0 in legacy replacement mode.
 77          */
 78         if (setup_irq(0, &irq0))
 79                 pr_info("Failed to register legacy timer interrupt\n");
 80 }
 81 
 82 /* Default timer init function */
 83 void __init hpet_time_init(void)
 84 {
 85         if (!hpet_enable())
 86                 setup_pit_timer();
 87         setup_default_timer_irq();
 88 }
 89 
 90 static __init void x86_late_time_init(void)
 91 {
 92         x86_init.timers.timer_init();
 93         /*
 94          * After PIT/HPET timers init, select and setup
 95          * the final interrupt mode for delivering IRQs.
 96          */
 97         x86_init.irqs.intr_mode_init();
 98         tsc_init();
 99 }
100 
101 /*
102  * Initialize TSC and delay the periodic timer init to
103  * late x86_late_time_init() so ioremap works.
104  */
105 void __init time_init(void)
106 {
107         late_time_init = x86_late_time_init;
108 }
109 
110 /*
111  * Sanity check the vdso related archdata content.
112  */
113 void clocksource_arch_init(struct clocksource *cs)
114 {
115         if (cs->archdata.vclock_mode == VCLOCK_NONE)
116                 return;
117 
118         if (cs->archdata.vclock_mode > VCLOCK_MAX) {
119                 pr_warn("clocksource %s registered with invalid vclock_mode %d. Disabling vclock.\n",
120                         cs->name, cs->archdata.vclock_mode);
121                 cs->archdata.vclock_mode = VCLOCK_NONE;
122         }
123 
124         if (cs->mask != CLOCKSOURCE_MASK(64)) {
125                 pr_warn("clocksource %s registered with invalid mask %016llx. Disabling vclock.\n",
126                         cs->name, cs->mask);
127                 cs->archdata.vclock_mode = VCLOCK_NONE;
128         }
129 }
130 

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