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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/clockchips.h>
14#include <linux/interrupt.h>
15#include <linux/i8253.h>
16#include <linux/time.h>
17#include <linux/export.h>
18
19#include <asm/vsyscall.h>
20#include <asm/x86_init.h>
21#include <asm/i8259.h>
22#include <asm/timer.h>
23#include <asm/hpet.h>
24#include <asm/time.h>
25
26#ifdef CONFIG_X86_64
27__visible volatile unsigned long jiffies __cacheline_aligned = INITIAL_JIFFIES;
28#endif
29
30unsigned long profile_pc(struct pt_regs *regs)
31{
32 unsigned long pc = instruction_pointer(regs);
33
34 if (!user_mode(regs) && in_lock_functions(pc)) {
35#ifdef CONFIG_FRAME_POINTER
36 return *(unsigned long *)(regs->bp + sizeof(long));
37#else
38 unsigned long *sp =
39 (unsigned long *)kernel_stack_pointer(regs);
40 /*
41 * Return address is either directly at stack pointer
42 * or above a saved flags. Eflags has bits 22-31 zero,
43 * kernel addresses don't.
44 */
45 if (sp[0] >> 22)
46 return sp[0];
47 if (sp[1] >> 22)
48 return sp[1];
49#endif
50 }
51 return pc;
52}
53EXPORT_SYMBOL(profile_pc);
54
55/*
56 * Default timer interrupt handler for PIT/HPET
57 */
58static irqreturn_t timer_interrupt(int irq, void *dev_id)
59{
60 global_clock_event->event_handler(global_clock_event);
61 return IRQ_HANDLED;
62}
63
64static struct irqaction irq0 = {
65 .handler = timer_interrupt,
66 .flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
67 .name = "timer"
68};
69
70static void __init setup_default_timer_irq(void)
71{
72 /*
73 * Unconditionally register the legacy timer; even without legacy
74 * PIC/PIT we need this for the HPET0 in legacy replacement mode.
75 */
76 if (setup_irq(0, &irq0))
77 pr_info("Failed to register legacy timer interrupt\n");
78}
79
80/* Default timer init function */
81void __init hpet_time_init(void)
82{
83 if (!hpet_enable())
84 setup_pit_timer();
85 setup_default_timer_irq();
86}
87
88static __init void x86_late_time_init(void)
89{
90 x86_init.timers.timer_init();
91 /*
92 * After PIT/HPET timers init, select and setup
93 * the final interrupt mode for delivering IRQs.
94 */
95 x86_init.irqs.intr_mode_init();
96 tsc_init();
97}
98
99/*
100 * Initialize TSC and delay the periodic timer init to
101 * late x86_late_time_init() so ioremap works.
102 */
103void __init time_init(void)
104{
105 late_time_init = x86_late_time_init;
106}
1/*
2 * Copyright (c) 1991,1992,1995 Linus Torvalds
3 * Copyright (c) 1994 Alan Modra
4 * Copyright (c) 1995 Markus Kuhn
5 * Copyright (c) 1996 Ingo Molnar
6 * Copyright (c) 1998 Andrea Arcangeli
7 * Copyright (c) 2002,2006 Vojtech Pavlik
8 * Copyright (c) 2003 Andi Kleen
9 *
10 */
11
12#include <linux/clockchips.h>
13#include <linux/interrupt.h>
14#include <linux/i8253.h>
15#include <linux/time.h>
16#include <linux/mca.h>
17
18#include <asm/vsyscall.h>
19#include <asm/x86_init.h>
20#include <asm/i8259.h>
21#include <asm/timer.h>
22#include <asm/hpet.h>
23#include <asm/time.h>
24
25#ifdef CONFIG_X86_64
26DEFINE_VVAR(volatile unsigned long, jiffies) = INITIAL_JIFFIES;
27#endif
28
29unsigned long profile_pc(struct pt_regs *regs)
30{
31 unsigned long pc = instruction_pointer(regs);
32
33 if (!user_mode_vm(regs) && in_lock_functions(pc)) {
34#ifdef CONFIG_FRAME_POINTER
35 return *(unsigned long *)(regs->bp + sizeof(long));
36#else
37 unsigned long *sp =
38 (unsigned long *)kernel_stack_pointer(regs);
39 /*
40 * Return address is either directly at stack pointer
41 * or above a saved flags. Eflags has bits 22-31 zero,
42 * kernel addresses don't.
43 */
44 if (sp[0] >> 22)
45 return sp[0];
46 if (sp[1] >> 22)
47 return sp[1];
48#endif
49 }
50 return pc;
51}
52EXPORT_SYMBOL(profile_pc);
53
54/*
55 * Default timer interrupt handler for PIT/HPET
56 */
57static irqreturn_t timer_interrupt(int irq, void *dev_id)
58{
59 /* Keep nmi watchdog up to date */
60 inc_irq_stat(irq0_irqs);
61
62 global_clock_event->event_handler(global_clock_event);
63
64 /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
65 if (MCA_bus)
66 outb_p(inb_p(0x61)| 0x80, 0x61);
67
68 return IRQ_HANDLED;
69}
70
71static struct irqaction irq0 = {
72 .handler = timer_interrupt,
73 .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
74 .name = "timer"
75};
76
77void __init setup_default_timer_irq(void)
78{
79 setup_irq(0, &irq0);
80}
81
82/* Default timer init function */
83void __init hpet_time_init(void)
84{
85 if (!hpet_enable())
86 setup_pit_timer();
87 setup_default_timer_irq();
88}
89
90static __init void x86_late_time_init(void)
91{
92 x86_init.timers.timer_init();
93 tsc_init();
94}
95
96/*
97 * Initialize TSC and delay the periodic timer init to
98 * late x86_late_time_init() so ioremap works.
99 */
100void __init time_init(void)
101{
102 late_time_init = x86_late_time_init;
103}