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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (c) 1991,1992,1995 Linus Torvalds
- * Copyright (c) 1994 Alan Modra
- * Copyright (c) 1995 Markus Kuhn
- * Copyright (c) 1996 Ingo Molnar
- * Copyright (c) 1998 Andrea Arcangeli
- * Copyright (c) 2002,2006 Vojtech Pavlik
- * Copyright (c) 2003 Andi Kleen
- *
- */
- #include <linux/clocksource.h>
- #include <linux/clockchips.h>
- #include <linux/interrupt.h>
- #include <linux/irq.h>
- #include <linux/i8253.h>
- #include <linux/time.h>
- #include <linux/export.h>
- #include <asm/vsyscall.h>
- #include <asm/x86_init.h>
- #include <asm/i8259.h>
- #include <asm/timer.h>
- #include <asm/hpet.h>
- #include <asm/time.h>
- unsigned long profile_pc(struct pt_regs *regs)
- {
- unsigned long pc = instruction_pointer(regs);
- if (!user_mode(regs) && in_lock_functions(pc)) {
- #ifdef CONFIG_FRAME_POINTER
- return *(unsigned long *)(regs->bp + sizeof(long));
- #else
- unsigned long *sp = (unsigned long *)regs->sp;
- /*
- * Return address is either directly at stack pointer
- * or above a saved flags. Eflags has bits 22-31 zero,
- * kernel addresses don't.
- */
- if (sp[0] >> 22)
- return sp[0];
- if (sp[1] >> 22)
- return sp[1];
- #endif
- }
- return pc;
- }
- EXPORT_SYMBOL(profile_pc);
- /*
- * Default timer interrupt handler for PIT/HPET
- */
- static irqreturn_t timer_interrupt(int irq, void *dev_id)
- {
- global_clock_event->event_handler(global_clock_event);
- return IRQ_HANDLED;
- }
- static void __init setup_default_timer_irq(void)
- {
- unsigned long flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER;
- /*
- * Unconditionally register the legacy timer interrupt; even
- * without legacy PIC/PIT we need this for the HPET0 in legacy
- * replacement mode.
- */
- if (request_irq(0, timer_interrupt, flags, "timer", NULL))
- pr_info("Failed to register legacy timer interrupt\n");
- }
- /* Default timer init function */
- void __init hpet_time_init(void)
- {
- if (!hpet_enable()) {
- if (!pit_timer_init())
- return;
- }
- setup_default_timer_irq();
- }
- static __init void x86_late_time_init(void)
- {
- /*
- * Before PIT/HPET init, select the interrupt mode. This is required
- * to make the decision whether PIT should be initialized correct.
- */
- x86_init.irqs.intr_mode_select();
- /* Setup the legacy timers */
- x86_init.timers.timer_init();
- /*
- * After PIT/HPET timers init, set up the final interrupt mode for
- * delivering IRQs.
- */
- x86_init.irqs.intr_mode_init();
- tsc_init();
- if (static_cpu_has(X86_FEATURE_WAITPKG))
- use_tpause_delay();
- }
- /*
- * Initialize TSC and delay the periodic timer init to
- * late x86_late_time_init() so ioremap works.
- */
- void __init time_init(void)
- {
- late_time_init = x86_late_time_init;
- }
- /*
- * Sanity check the vdso related archdata content.
- */
- void clocksource_arch_init(struct clocksource *cs)
- {
- if (cs->vdso_clock_mode == VDSO_CLOCKMODE_NONE)
- return;
- if (cs->mask != CLOCKSOURCE_MASK(64)) {
- pr_warn("clocksource %s registered with invalid mask %016llx for VDSO. Disabling VDSO support.\n",
- cs->name, cs->mask);
- cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE;
- }
- }
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