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Commit | Line | Data |
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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 | |
64fcbac1 | 25 | #if defined(CONFIG_X86_32) && defined(CONFIG_X86_IO_APIC) |
1da177e4 | 26 | int timer_ack; |
64fcbac1 | 27 | #endif |
1da177e4 | 28 | |
454ede7e TG |
29 | #ifdef CONFIG_X86_64 |
30 | volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES; | |
31 | #endif | |
32 | ||
1da177e4 LT |
33 | unsigned long profile_pc(struct pt_regs *regs) |
34 | { | |
35 | unsigned long pc = instruction_pointer(regs); | |
36 | ||
2c44e668 | 37 | if (!user_mode_vm(regs) && in_lock_functions(pc)) { |
0cb91a22 | 38 | #ifdef CONFIG_FRAME_POINTER |
2c460d0b | 39 | return *(unsigned long *)(regs->bp + sizeof(long)); |
0cb91a22 | 40 | #else |
ef451288 TG |
41 | unsigned long *sp = (unsigned long *)regs->sp; |
42 | /* | |
43 | * Return address is either directly at stack pointer | |
44 | * or above a saved flags. Eflags has bits 22-31 zero, | |
45 | * kernel addresses don't. | |
46 | */ | |
fe599f9f | 47 | if (sp[0] >> 22) |
0cb91a22 AK |
48 | return sp[0]; |
49 | if (sp[1] >> 22) | |
50 | return sp[1]; | |
51 | #endif | |
52 | } | |
1da177e4 LT |
53 | return pc; |
54 | } | |
55 | EXPORT_SYMBOL(profile_pc); | |
1da177e4 LT |
56 | |
57 | /* | |
454ede7e | 58 | * Default timer interrupt handler for PIT/HPET |
1da177e4 | 59 | */ |
845b3944 | 60 | static irqreturn_t timer_interrupt(int irq, void *dev_id) |
1da177e4 | 61 | { |
3c9aea47 | 62 | /* Keep nmi watchdog up to date */ |
8ae93669 | 63 | inc_irq_stat(irq0_irqs); |
3c9aea47 | 64 | |
64fcbac1 | 65 | /* Optimized out for !IO_APIC and x86_64 */ |
1da177e4 LT |
66 | if (timer_ack) { |
67 | /* | |
68 | * Subtle, when I/O APICs are used we have to ack timer IRQ | |
d11d5794 | 69 | * manually to deassert NMI lines for the watchdog if run |
1da177e4 LT |
70 | * on an 82489DX-based system. |
71 | */ | |
72 | spin_lock(&i8259A_lock); | |
73 | outb(0x0c, PIC_MASTER_OCW3); | |
74 | /* Ack the IRQ; AEOI will end it automatically. */ | |
75 | inb(PIC_MASTER_POLL); | |
76 | spin_unlock(&i8259A_lock); | |
77 | } | |
1da177e4 | 78 | |
ecce8508 | 79 | global_clock_event->event_handler(global_clock_event); |
1da177e4 | 80 | |
0be69394 TG |
81 | /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */ |
82 | if (MCA_bus) | |
83 | outb_p(inb_p(0x61)| 0x80, 0x61); | |
1da177e4 | 84 | |
1da177e4 LT |
85 | return IRQ_HANDLED; |
86 | } | |
87 | ||
845b3944 TG |
88 | static struct irqaction irq0 = { |
89 | .handler = timer_interrupt, | |
90 | .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER, | |
91 | .name = "timer" | |
92 | }; | |
93 | ||
94 | void __init setup_default_timer_irq(void) | |
95 | { | |
96 | irq0.mask = cpumask_of_cpu(0); | |
97 | setup_irq(0, &irq0); | |
98 | } | |
99 | ||
100 | /* Default timer init function */ | |
e30fab3a | 101 | void __init hpet_time_init(void) |
1da177e4 | 102 | { |
e9e2cdb4 TG |
103 | if (!hpet_enable()) |
104 | setup_pit_timer(); | |
845b3944 TG |
105 | setup_default_timer_irq(); |
106 | } | |
107 | ||
108 | static void x86_late_time_init(void) | |
109 | { | |
110 | x86_init.timers.timer_init(); | |
dd0a70c8 | 111 | tsc_init(); |
1da177e4 | 112 | } |
1da177e4 | 113 | |
e30fab3a | 114 | /* |
845b3944 TG |
115 | * Initialize TSC and delay the periodic timer init to |
116 | * late x86_late_time_init() so ioremap works. | |
e30fab3a | 117 | */ |
1da177e4 LT |
118 | void __init time_init(void) |
119 | { | |
845b3944 | 120 | late_time_init = x86_late_time_init; |
1da177e4 | 121 | } |