blob: dd5fbf4101fc393a3edad3bb3a569a1ed63269fa [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Thomas Gleixnerdd3e6e82009-08-20 15:35:23 +02002 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
Thomas Gleixnerecce8502009-08-20 15:28:50 +020012#include <linux/clockchips.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/interrupt.h>
Ralf Baechle334955e2011-06-01 19:04:57 +010014#include <linux/i8253.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/time.h>
Paul Gortmaker69c60c82011-05-26 12:22:53 -040016#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/mca.h>
18
Thomas Gleixnerdd3e6e82009-08-20 15:35:23 +020019#include <asm/vsyscall.h>
20#include <asm/x86_init.h>
Thomas Gleixnerecce8502009-08-20 15:28:50 +020021#include <asm/i8259.h>
Thomas Gleixnerdd3e6e82009-08-20 15:35:23 +020022#include <asm/timer.h>
23#include <asm/hpet.h>
24#include <asm/time.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Thomas Gleixner454ede72009-08-20 16:07:40 +020026#ifdef CONFIG_X86_64
Andy Lutomirski8c49d9a2011-05-23 09:31:24 -040027DEFINE_VVAR(volatile unsigned long, jiffies) = INITIAL_JIFFIES;
Thomas Gleixner454ede72009-08-20 16:07:40 +020028#endif
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030unsigned long profile_pc(struct pt_regs *regs)
31{
32 unsigned long pc = instruction_pointer(regs);
33
Glauber Costa2c44e662008-07-11 13:48:07 -030034 if (!user_mode_vm(regs) && in_lock_functions(pc)) {
Andi Kleen0cb91a22006-09-26 10:52:28 +020035#ifdef CONFIG_FRAME_POINTER
Glauber Costa2c460d02008-07-11 16:06:40 -030036 return *(unsigned long *)(regs->bp + sizeof(long));
Andi Kleen0cb91a22006-09-26 10:52:28 +020037#else
H. Peter Anvind1705c52009-10-12 11:32:31 -070038 unsigned long *sp =
39 (unsigned long *)kernel_stack_pointer(regs);
Thomas Gleixneref451282009-08-21 13:24:08 +020040 /*
41 * Return address is either directly at stack pointer
42 * or above a saved flags. Eflags has bits 22-31 zero,
43 * kernel addresses don't.
44 */
Thomas Gleixnerfe599f92008-01-30 13:30:26 +010045 if (sp[0] >> 22)
Andi Kleen0cb91a22006-09-26 10:52:28 +020046 return sp[0];
47 if (sp[1] >> 22)
48 return sp[1];
49#endif
50 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 return pc;
52}
53EXPORT_SYMBOL(profile_pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55/*
Thomas Gleixner454ede72009-08-20 16:07:40 +020056 * Default timer interrupt handler for PIT/HPET
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 */
Thomas Gleixner845b3942009-08-19 15:37:03 +020058static irqreturn_t timer_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
Thomas Gleixner3c9aea42007-10-12 23:04:06 +020060 /* Keep nmi watchdog up to date */
Hiroshi Shimamoto8ae93662008-12-12 15:52:26 -080061 inc_irq_stat(irq0_irqs);
Thomas Gleixner3c9aea42007-10-12 23:04:06 +020062
Thomas Gleixnerecce8502009-08-20 15:28:50 +020063 global_clock_event->event_handler(global_clock_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Thomas Gleixner0be69392009-08-20 15:59:35 +020065 /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
66 if (MCA_bus)
67 outb_p(inb_p(0x61)| 0x80, 0x61);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 return IRQ_HANDLED;
70}
71
Thomas Gleixner845b3942009-08-19 15:37:03 +020072static struct irqaction irq0 = {
73 .handler = timer_interrupt,
74 .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
75 .name = "timer"
76};
77
78void __init setup_default_timer_irq(void)
79{
Thomas Gleixner845b3942009-08-19 15:37:03 +020080 setup_irq(0, &irq0);
81}
82
83/* Default timer init function */
Zachary Amsdene30fab32007-03-05 00:30:39 -080084void __init hpet_time_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -080086 if (!hpet_enable())
87 setup_pit_timer();
Thomas Gleixner845b3942009-08-19 15:37:03 +020088 setup_default_timer_irq();
89}
90
Thomas Gleixner54e26032009-09-16 08:42:26 +020091static __init void x86_late_time_init(void)
Thomas Gleixner845b3942009-08-19 15:37:03 +020092{
93 x86_init.timers.timer_init();
Thomas Gleixnerdd0a70c2009-08-20 16:51:07 +020094 tsc_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Zachary Amsdene30fab32007-03-05 00:30:39 -080097/*
Thomas Gleixner845b3942009-08-19 15:37:03 +020098 * Initialize TSC and delay the periodic timer init to
99 * late x86_late_time_init() so ioremap works.
Zachary Amsdene30fab32007-03-05 00:30:39 -0800100 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101void __init time_init(void)
102{
Thomas Gleixner845b3942009-08-19 15:37:03 +0200103 late_time_init = x86_late_time_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}