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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 void __init setup_default_timer_irq(void)
 62 {
 63         unsigned long flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER;
 64 
 65         /*
 66          * Unconditionally register the legacy timer interrupt; even
 67          * without legacy PIC/PIT we need this for the HPET0 in legacy
 68          * replacement mode.
 69          */
 70         if (request_irq(0, timer_interrupt, flags, "timer", NULL))
 71                 pr_info("Failed to register legacy timer interrupt\n");
 72 }
 73 
 74 /* Default timer init function */
 75 void __init hpet_time_init(void)
 76 {
 77         if (!hpet_enable()) {
 78                 if (!pit_timer_init())
 79                         return;
 80         }
 81 
 82         setup_default_timer_irq();
 83 }
 84 
 85 static __init void x86_late_time_init(void)
 86 {
 87         /*
 88          * Before PIT/HPET init, select the interrupt mode. This is required
 89          * to make the decision whether PIT should be initialized correct.
 90          */
 91         x86_init.irqs.intr_mode_select();
 92 
 93         /* Setup the legacy timers */
 94         x86_init.timers.timer_init();
 95 
 96         /*
 97          * After PIT/HPET timers init, set up the final interrupt mode for
 98          * delivering IRQs.
 99          */
100         x86_init.irqs.intr_mode_init();
101         tsc_init();
102 
103         if (static_cpu_has(X86_FEATURE_WAITPKG))
104                 use_tpause_delay();
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->vdso_clock_mode == VDSO_CLOCKMODE_NONE)
122                 return;
123 
124         if (cs->mask != CLOCKSOURCE_MASK(64)) {
125                 pr_warn("clocksource %s registered with invalid mask %016llx for VDSO. Disabling VDSO support.\n",
126                         cs->name, cs->mask);
127                 cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE;
128         }
129 }
130 

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