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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 unsigned long profile_pc(struct pt_regs *regs)
 29 {
 30         unsigned long pc = instruction_pointer(regs);
 31 
 32         if (!user_mode(regs) && in_lock_functions(pc)) {
 33 #ifdef CONFIG_FRAME_POINTER
 34                 return *(unsigned long *)(regs->bp + sizeof(long));
 35 #else
 36                 unsigned long *sp = (unsigned long *)regs->sp;
 37                 /*
 38                  * Return address is either directly at stack pointer
 39                  * or above a saved flags. Eflags has bits 22-31 zero,
 40                  * kernel addresses don't.
 41                  */
 42                 if (sp[0] >> 22)
 43                         return sp[0];
 44                 if (sp[1] >> 22)
 45                         return sp[1];
 46 #endif
 47         }
 48         return pc;
 49 }
 50 EXPORT_SYMBOL(profile_pc);
 51 
 52 /*
 53  * Default timer interrupt handler for PIT/HPET
 54  */
 55 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 56 {
 57         global_clock_event->event_handler(global_clock_event);
 58         return IRQ_HANDLED;
 59 }
 60 
 61 static struct irqaction irq0  = {
 62         .handler = timer_interrupt,
 63         .flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
 64         .name = "timer"
 65 };
 66 
 67 static void __init setup_default_timer_irq(void)
 68 {
 69         /*
 70          * Unconditionally register the legacy timer; even without legacy
 71          * PIC/PIT we need this for the HPET0 in legacy replacement mode.
 72          */
 73         if (setup_irq(0, &irq0))
 74                 pr_info("Failed to register legacy timer interrupt\n");
 75 }
 76 
 77 /* Default timer init function */
 78 void __init hpet_time_init(void)
 79 {
 80         if (!hpet_enable()) {
 81                 if (!pit_timer_init())
 82                         return;
 83         }
 84 
 85         setup_default_timer_irq();
 86 }
 87 
 88 static __init void x86_late_time_init(void)
 89 {
 90         /*
 91          * Before PIT/HPET init, select the interrupt mode. This is required
 92          * to make the decision whether PIT should be initialized correct.
 93          */
 94         x86_init.irqs.intr_mode_select();
 95 
 96         /* Setup the legacy timers */
 97         x86_init.timers.timer_init();
 98 
 99         /*
100          * After PIT/HPET timers init, set up the final interrupt mode for
101          * delivering IRQs.
102          */
103         x86_init.irqs.intr_mode_init();
104         tsc_init();
105 }
106 
107 /*
108  * Initialize TSC and delay the periodic timer init to
109  * late x86_late_time_init() so ioremap works.
110  */
111 void __init time_init(void)
112 {
113         late_time_init = x86_late_time_init;
114 }
115 
116 /*
117  * Sanity check the vdso related archdata content.
118  */
119 void clocksource_arch_init(struct clocksource *cs)
120 {
121         if (cs->archdata.vclock_mode == VCLOCK_NONE)
122                 return;
123 
124         if (cs->archdata.vclock_mode > VCLOCK_MAX) {
125                 pr_warn("clocksource %s registered with invalid vclock_mode %d. Disabling vclock.\n",
126                         cs->name, cs->archdata.vclock_mode);
127                 cs->archdata.vclock_mode = VCLOCK_NONE;
128         }
129 
130         if (cs->mask != CLOCKSOURCE_MASK(64)) {
131                 pr_warn("clocksource %s registered with invalid mask %016llx. Disabling vclock.\n",
132                         cs->name, cs->mask);
133                 cs->archdata.vclock_mode = VCLOCK_NONE;
134         }
135 }
136 

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