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 LT |
13 | #include <linux/interrupt.h> |
14 | #include <linux/time.h> | |
1da177e4 LT |
15 | #include <linux/mca.h> |
16 | ||
dd3e6e8c TG |
17 | #include <asm/vsyscall.h> |
18 | #include <asm/x86_init.h> | |
ecce8508 TG |
19 | #include <asm/i8259.h> |
20 | #include <asm/i8253.h> | |
dd3e6e8c TG |
21 | #include <asm/timer.h> |
22 | #include <asm/hpet.h> | |
23 | #include <asm/time.h> | |
1da177e4 | 24 | |
454ede7e TG |
25 | #ifdef CONFIG_X86_64 |
26 | volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES; | |
27 | #endif | |
28 | ||
1da177e4 LT |
29 | unsigned long profile_pc(struct pt_regs *regs) |
30 | { | |
31 | unsigned long pc = instruction_pointer(regs); | |
32 | ||
2c44e668 | 33 | if (!user_mode_vm(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 | { |
3c9aea47 | 59 | /* Keep nmi watchdog up to date */ |
8ae93669 | 60 | inc_irq_stat(irq0_irqs); |
3c9aea47 | 61 | |
ecce8508 | 62 | global_clock_event->event_handler(global_clock_event); |
1da177e4 | 63 | |
0be69394 TG |
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); | |
1da177e4 | 67 | |
1da177e4 LT |
68 | return IRQ_HANDLED; |
69 | } | |
70 | ||
845b3944 TG |
71 | static struct irqaction irq0 = { |
72 | .handler = timer_interrupt, | |
73 | .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER, | |
74 | .name = "timer" | |
75 | }; | |
76 | ||
77 | void __init setup_default_timer_irq(void) | |
78 | { | |
845b3944 TG |
79 | setup_irq(0, &irq0); |
80 | } | |
81 | ||
82 | /* Default timer init function */ | |
e30fab3a | 83 | void __init hpet_time_init(void) |
1da177e4 | 84 | { |
e9e2cdb4 TG |
85 | if (!hpet_enable()) |
86 | setup_pit_timer(); | |
845b3944 TG |
87 | setup_default_timer_irq(); |
88 | } | |
89 | ||
54e2603f | 90 | static __init void x86_late_time_init(void) |
845b3944 TG |
91 | { |
92 | x86_init.timers.timer_init(); | |
dd0a70c8 | 93 | tsc_init(); |
1da177e4 | 94 | } |
1da177e4 | 95 | |
e30fab3a | 96 | /* |
845b3944 TG |
97 | * Initialize TSC and delay the periodic timer init to |
98 | * late x86_late_time_init() so ioremap works. | |
e30fab3a | 99 | */ |
1da177e4 LT |
100 | void __init time_init(void) |
101 | { | |
845b3944 | 102 | late_time_init = x86_late_time_init; |
1da177e4 | 103 | } |