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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// 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}