commit | author | age
|
a07526
|
1 |
// SPDX-License-Identifier: GPL-2.0 |
H |
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 |
unsigned long profile_pc(struct pt_regs *regs) |
|
29 |
{ |
|
30 |
unsigned long pc = instruction_pointer(regs); |
|
31 |
|
|
32 |
if (!user_mode(regs) && in_lock_functions(pc)) { |
|
33 |
#ifdef CONFIG_FRAME_POINTER |
|
34 |
return *(unsigned long *)(regs->bp + sizeof(long)); |
|
35 |
#else |
|
36 |
unsigned long *sp = (unsigned long *)regs->sp; |
|
37 |
/* |
|
38 |
* Return address is either directly at stack pointer |
|
39 |
* or above a saved flags. Eflags has bits 22-31 zero, |
|
40 |
* kernel addresses don't. |
|
41 |
*/ |
|
42 |
if (sp[0] >> 22) |
|
43 |
return sp[0]; |
|
44 |
if (sp[1] >> 22) |
|
45 |
return sp[1]; |
|
46 |
#endif |
|
47 |
} |
|
48 |
return pc; |
|
49 |
} |
|
50 |
EXPORT_SYMBOL(profile_pc); |
|
51 |
|
|
52 |
/* |
|
53 |
* Default timer interrupt handler for PIT/HPET |
|
54 |
*/ |
|
55 |
static irqreturn_t timer_interrupt(int irq, void *dev_id) |
|
56 |
{ |
2f529f
|
57 |
clockevents_handle_event(global_clock_event); |
a07526
|
58 |
return IRQ_HANDLED; |
H |
59 |
} |
|
60 |
|
|
61 |
static void __init setup_default_timer_irq(void) |
|
62 |
{ |
|
63 |
unsigned long flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER; |
|
64 |
|
|
65 |
/* |
|
66 |
* Unconditionally register the legacy timer interrupt; even |
|
67 |
* without legacy PIC/PIT we need this for the HPET0 in legacy |
|
68 |
* replacement mode. |
|
69 |
*/ |
|
70 |
if (request_irq(0, timer_interrupt, flags, "timer", NULL)) |
|
71 |
pr_info("Failed to register legacy timer interrupt\n"); |
|
72 |
} |
|
73 |
|
|
74 |
/* Default timer init function */ |
|
75 |
void __init hpet_time_init(void) |
|
76 |
{ |
|
77 |
if (!hpet_enable()) { |
|
78 |
if (!pit_timer_init()) |
|
79 |
return; |
|
80 |
} |
|
81 |
|
|
82 |
setup_default_timer_irq(); |
|
83 |
} |
|
84 |
|
|
85 |
static __init void x86_late_time_init(void) |
|
86 |
{ |
|
87 |
/* |
|
88 |
* Before PIT/HPET init, select the interrupt mode. This is required |
|
89 |
* to make the decision whether PIT should be initialized correct. |
|
90 |
*/ |
|
91 |
x86_init.irqs.intr_mode_select(); |
|
92 |
|
|
93 |
/* Setup the legacy timers */ |
|
94 |
x86_init.timers.timer_init(); |
|
95 |
|
|
96 |
/* |
|
97 |
* After PIT/HPET timers init, set up the final interrupt mode for |
|
98 |
* delivering IRQs. |
|
99 |
*/ |
|
100 |
x86_init.irqs.intr_mode_init(); |
|
101 |
tsc_init(); |
|
102 |
|
|
103 |
if (static_cpu_has(X86_FEATURE_WAITPKG)) |
|
104 |
use_tpause_delay(); |
|
105 |
} |
|
106 |
|
|
107 |
/* |
|
108 |
* Initialize TSC and delay the periodic timer init to |
|
109 |
* late x86_late_time_init() so ioremap works. |
|
110 |
*/ |
|
111 |
void __init time_init(void) |
|
112 |
{ |
|
113 |
late_time_init = x86_late_time_init; |
|
114 |
} |
|
115 |
|
|
116 |
/* |
|
117 |
* Sanity check the vdso related archdata content. |
|
118 |
*/ |
|
119 |
void clocksource_arch_init(struct clocksource *cs) |
|
120 |
{ |
|
121 |
if (cs->vdso_clock_mode == VDSO_CLOCKMODE_NONE) |
|
122 |
return; |
|
123 |
|
|
124 |
if (cs->mask != CLOCKSOURCE_MASK(64)) { |
|
125 |
pr_warn("clocksource %s registered with invalid mask %016llx for VDSO. Disabling VDSO support.\n", |
|
126 |
cs->name, cs->mask); |
|
127 |
cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE; |
|
128 |
} |
|
129 |
} |