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 | |
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 |
d1705c55 PA |
41 | unsigned long *sp = |
42 | (unsigned long *)kernel_stack_pointer(regs); | |
ef451288 TG |
43 | /* |
44 | * Return address is either directly at stack pointer | |
45 | * or above a saved flags. Eflags has bits 22-31 zero, | |
46 | * kernel addresses don't. | |
47 | */ | |
fe599f9f | 48 | if (sp[0] >> 22) |
0cb91a22 AK |
49 | return sp[0]; |
50 | if (sp[1] >> 22) | |
51 | return sp[1]; | |
52 | #endif | |
53 | } | |
1da177e4 LT |
54 | return pc; |
55 | } | |
56 | EXPORT_SYMBOL(profile_pc); | |
1da177e4 LT |
57 | |
58 | /* | |
454ede7e | 59 | * Default timer interrupt handler for PIT/HPET |
1da177e4 | 60 | */ |
845b3944 | 61 | static irqreturn_t timer_interrupt(int irq, void *dev_id) |
1da177e4 | 62 | { |
3c9aea47 | 63 | /* Keep nmi watchdog up to date */ |
8ae93669 | 64 | inc_irq_stat(irq0_irqs); |
3c9aea47 | 65 | |
64fcbac1 | 66 | /* Optimized out for !IO_APIC and x86_64 */ |
1da177e4 LT |
67 | if (timer_ack) { |
68 | /* | |
69 | * Subtle, when I/O APICs are used we have to ack timer IRQ | |
d11d5794 | 70 | * manually to deassert NMI lines for the watchdog if run |
1da177e4 LT |
71 | * on an 82489DX-based system. |
72 | */ | |
5619c280 | 73 | raw_spin_lock(&i8259A_lock); |
1da177e4 LT |
74 | outb(0x0c, PIC_MASTER_OCW3); |
75 | /* Ack the IRQ; AEOI will end it automatically. */ | |
76 | inb(PIC_MASTER_POLL); | |
5619c280 | 77 | raw_spin_unlock(&i8259A_lock); |
1da177e4 | 78 | } |
1da177e4 | 79 | |
ecce8508 | 80 | global_clock_event->event_handler(global_clock_event); |
1da177e4 | 81 | |
0be69394 TG |
82 | /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */ |
83 | if (MCA_bus) | |
84 | outb_p(inb_p(0x61)| 0x80, 0x61); | |
1da177e4 | 85 | |
1da177e4 LT |
86 | return IRQ_HANDLED; |
87 | } | |
88 | ||
845b3944 TG |
89 | static struct irqaction irq0 = { |
90 | .handler = timer_interrupt, | |
91 | .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER, | |
92 | .name = "timer" | |
93 | }; | |
94 | ||
95 | void __init setup_default_timer_irq(void) | |
96 | { | |
845b3944 TG |
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 | ||
54e2603f | 108 | static __init void x86_late_time_init(void) |
845b3944 TG |
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 | } |