// 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/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 *)kernel_stack_pointer(regs);
|
/*
|
* 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 struct irqaction irq0 = {
|
.handler = timer_interrupt,
|
.flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
|
.name = "timer"
|
};
|
|
static void __init setup_default_timer_irq(void)
|
{
|
/*
|
* Unconditionally register the legacy timer; even without legacy
|
* PIC/PIT we need this for the HPET0 in legacy replacement mode.
|
*/
|
if (setup_irq(0, &irq0))
|
pr_info("Failed to register legacy timer interrupt\n");
|
}
|
|
/* Default timer init function */
|
void __init hpet_time_init(void)
|
{
|
if (!hpet_enable())
|
setup_pit_timer();
|
setup_default_timer_irq();
|
}
|
|
static __init void x86_late_time_init(void)
|
{
|
x86_init.timers.timer_init();
|
/*
|
* After PIT/HPET timers init, select and setup
|
* the final interrupt mode for delivering IRQs.
|
*/
|
x86_init.irqs.intr_mode_init();
|
tsc_init();
|
}
|
|
/*
|
* 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;
|
}
|
