Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
dd3e6e8c TG |
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 | |
1da177e4 | 9 | * |
1da177e4 LT |
10 | */ |
11 | ||
ecce8508 | 12 | #include <linux/clockchips.h> |
1da177e4 | 13 | #include <linux/interrupt.h> |
334955ef | 14 | #include <linux/i8253.h> |
1da177e4 | 15 | #include <linux/time.h> |
69c60c88 | 16 | #include <linux/export.h> |
1da177e4 | 17 | |
dd3e6e8c TG |
18 | #include <asm/vsyscall.h> |
19 | #include <asm/x86_init.h> | |
ecce8508 | 20 | #include <asm/i8259.h> |
dd3e6e8c TG |
21 | #include <asm/timer.h> |
22 | #include <asm/hpet.h> | |
23 | #include <asm/time.h> | |
1da177e4 | 24 | |
454ede7e | 25 | #ifdef CONFIG_X86_64 |
61a492fb | 26 | __visible volatile unsigned long jiffies __cacheline_aligned = INITIAL_JIFFIES; |
454ede7e TG |
27 | #endif |
28 | ||
1da177e4 LT |
29 | unsigned long profile_pc(struct pt_regs *regs) |
30 | { | |
31 | unsigned long pc = instruction_pointer(regs); | |
32 | ||
f39b6f0e | 33 | if (!user_mode(regs) && in_lock_functions(pc)) { |
0cb91a22 | 34 | #ifdef CONFIG_FRAME_POINTER |
2c460d0b | 35 | return *(unsigned long *)(regs->bp + sizeof(long)); |
0cb91a22 | 36 | #else |
d1705c55 PA |
37 | unsigned long *sp = |
38 | (unsigned long *)kernel_stack_pointer(regs); | |
ef451288 TG |
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 | */ | |
fe599f9f | 44 | if (sp[0] >> 22) |
0cb91a22 AK |
45 | return sp[0]; |
46 | if (sp[1] >> 22) | |
47 | return sp[1]; | |
48 | #endif | |
49 | } | |
1da177e4 LT |
50 | return pc; |
51 | } | |
52 | EXPORT_SYMBOL(profile_pc); | |
1da177e4 LT |
53 | |
54 | /* | |
454ede7e | 55 | * Default timer interrupt handler for PIT/HPET |
1da177e4 | 56 | */ |
845b3944 | 57 | static irqreturn_t timer_interrupt(int irq, void *dev_id) |
1da177e4 | 58 | { |
ecce8508 | 59 | global_clock_event->event_handler(global_clock_event); |
1da177e4 LT |
60 | return IRQ_HANDLED; |
61 | } | |
62 | ||
845b3944 TG |
63 | static struct irqaction irq0 = { |
64 | .handler = timer_interrupt, | |
d20d2efb | 65 | .flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER, |
845b3944 TG |
66 | .name = "timer" |
67 | }; | |
68 | ||
69 | void __init setup_default_timer_irq(void) | |
70 | { | |
a90b858c AS |
71 | if (!nr_legacy_irqs()) |
72 | return; | |
845b3944 TG |
73 | setup_irq(0, &irq0); |
74 | } | |
75 | ||
76 | /* Default timer init function */ | |
e30fab3a | 77 | void __init hpet_time_init(void) |
1da177e4 | 78 | { |
e9e2cdb4 TG |
79 | if (!hpet_enable()) |
80 | setup_pit_timer(); | |
845b3944 TG |
81 | setup_default_timer_irq(); |
82 | } | |
83 | ||
54e2603f | 84 | static __init void x86_late_time_init(void) |
845b3944 TG |
85 | { |
86 | x86_init.timers.timer_init(); | |
dd0a70c8 | 87 | tsc_init(); |
1da177e4 | 88 | } |
1da177e4 | 89 | |
e30fab3a | 90 | /* |
845b3944 TG |
91 | * Initialize TSC and delay the periodic timer init to |
92 | * late x86_late_time_init() so ioremap works. | |
e30fab3a | 93 | */ |
1da177e4 LT |
94 | void __init time_init(void) |
95 | { | |
845b3944 | 96 | late_time_init = x86_late_time_init; |
1da177e4 | 97 | } |