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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#ifdef CONFIG_X86_64
29__visible volatile unsigned long jiffies __cacheline_aligned_in_smp = INITIAL_JIFFIES;
30#endif
31
32unsigned long profile_pc(struct pt_regs *regs)
33{
34 unsigned long pc = instruction_pointer(regs);
35
36 if (!user_mode(regs) && in_lock_functions(pc)) {
37#ifdef CONFIG_FRAME_POINTER
38 return *(unsigned long *)(regs->bp + sizeof(long));
39#else
40 unsigned long *sp = (unsigned long *)regs->sp;
41 /*
42 * Return address is either directly at stack pointer
43 * or above a saved flags. Eflags has bits 22-31 zero,
44 * kernel addresses don't.
45 */
46 if (sp[0] >> 22)
47 return sp[0];
48 if (sp[1] >> 22)
49 return sp[1];
50#endif
51 }
52 return pc;
53}
54EXPORT_SYMBOL(profile_pc);
55
56/*
57 * Default timer interrupt handler for PIT/HPET
58 */
59static irqreturn_t timer_interrupt(int irq, void *dev_id)
60{
61 global_clock_event->event_handler(global_clock_event);
62 return IRQ_HANDLED;
63}
64
65static struct irqaction irq0 = {
66 .handler = timer_interrupt,
67 .flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
68 .name = "timer"
69};
70
71static void __init setup_default_timer_irq(void)
72{
73 /*
74 * Unconditionally register the legacy timer; even without legacy
75 * PIC/PIT we need this for the HPET0 in legacy replacement mode.
76 */
77 if (setup_irq(0, &irq0))
78 pr_info("Failed to register legacy timer interrupt\n");
79}
80
81/* Default timer init function */
82void __init hpet_time_init(void)
83{
84 if (!hpet_enable()) {
85 if (!pit_timer_init())
86 return;
87 }
88
89 setup_default_timer_irq();
90}
91
92static __init void x86_late_time_init(void)
93{
94 x86_init.timers.timer_init();
95 /*
96 * After PIT/HPET timers init, select and setup
97 * the final interrupt mode for delivering IRQs.
98 */
99 x86_init.irqs.intr_mode_init();
100 tsc_init();
101}
102
103/*
104 * Initialize TSC and delay the periodic timer init to
105 * late x86_late_time_init() so ioremap works.
106 */
107void __init time_init(void)
108{
109 late_time_init = x86_late_time_init;
110}
111
112/*
113 * Sanity check the vdso related archdata content.
114 */
115void clocksource_arch_init(struct clocksource *cs)
116{
117 if (cs->archdata.vclock_mode == VCLOCK_NONE)
118 return;
119
120 if (cs->archdata.vclock_mode > VCLOCK_MAX) {
121 pr_warn("clocksource %s registered with invalid vclock_mode %d. Disabling vclock.\n",
122 cs->name, cs->archdata.vclock_mode);
123 cs->archdata.vclock_mode = VCLOCK_NONE;
124 }
125
126 if (cs->mask != CLOCKSOURCE_MASK(64)) {
127 pr_warn("clocksource %s registered with invalid mask %016llx. Disabling vclock.\n",
128 cs->name, cs->mask);
129 cs->archdata.vclock_mode = VCLOCK_NONE;
130 }
131}
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/export.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
26__visible DEFINE_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 global_clock_event->event_handler(global_clock_event);
60 return IRQ_HANDLED;
61}
62
63static struct irqaction irq0 = {
64 .handler = timer_interrupt,
65 .flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
66 .name = "timer"
67};
68
69void __init setup_default_timer_irq(void)
70{
71 setup_irq(0, &irq0);
72}
73
74/* Default timer init function */
75void __init hpet_time_init(void)
76{
77 if (!hpet_enable())
78 setup_pit_timer();
79 setup_default_timer_irq();
80}
81
82static __init void x86_late_time_init(void)
83{
84 x86_init.timers.timer_init();
85 tsc_init();
86}
87
88/*
89 * Initialize TSC and delay the periodic timer init to
90 * late x86_late_time_init() so ioremap works.
91 */
92void __init time_init(void)
93{
94 late_time_init = x86_late_time_init;
95}