936577c61d
Right now nobody cares, but the suspend/resume code will eventually want to suspend device interrupts without suspending the timer, and will depend on this flag to know. The modern x86 timer infrastructure uses the local APIC timers and never shows up as a device interrupt at all, so it isn't affected and doesn't need any of this. Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
175 lines
3.9 KiB
C
175 lines
3.9 KiB
C
/*
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* Machine specific setup for generic
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*/
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <asm/acpi.h>
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#include <asm/arch_hooks.h>
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#include <asm/e820.h>
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#include <asm/setup.h>
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#include <mach_ipi.h>
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#ifdef CONFIG_HOTPLUG_CPU
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#define DEFAULT_SEND_IPI (1)
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#else
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#define DEFAULT_SEND_IPI (0)
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#endif
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int no_broadcast = DEFAULT_SEND_IPI;
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/**
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* pre_intr_init_hook - initialisation prior to setting up interrupt vectors
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*
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* Description:
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* Perform any necessary interrupt initialisation prior to setting up
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* the "ordinary" interrupt call gates. For legacy reasons, the ISA
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* interrupts should be initialised here if the machine emulates a PC
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* in any way.
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**/
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void __init pre_intr_init_hook(void)
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{
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if (x86_quirks->arch_pre_intr_init) {
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if (x86_quirks->arch_pre_intr_init())
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return;
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}
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init_ISA_irqs();
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}
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/*
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* IRQ2 is cascade interrupt to second interrupt controller
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*/
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static struct irqaction irq2 = {
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.handler = no_action,
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.mask = CPU_MASK_NONE,
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.name = "cascade",
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};
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/**
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* intr_init_hook - post gate setup interrupt initialisation
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*
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* Description:
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* Fill in any interrupts that may have been left out by the general
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* init_IRQ() routine. interrupts having to do with the machine rather
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* than the devices on the I/O bus (like APIC interrupts in intel MP
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* systems) are started here.
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**/
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void __init intr_init_hook(void)
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{
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if (x86_quirks->arch_intr_init) {
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if (x86_quirks->arch_intr_init())
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return;
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}
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if (!acpi_ioapic)
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setup_irq(2, &irq2);
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}
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/**
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* pre_setup_arch_hook - hook called prior to any setup_arch() execution
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*
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* Description:
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* generally used to activate any machine specific identification
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* routines that may be needed before setup_arch() runs. On Voyager
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* this is used to get the board revision and type.
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**/
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void __init pre_setup_arch_hook(void)
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{
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}
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/**
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* trap_init_hook - initialise system specific traps
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*
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* Description:
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* Called as the final act of trap_init(). Used in VISWS to initialise
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* the various board specific APIC traps.
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**/
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void __init trap_init_hook(void)
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{
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if (x86_quirks->arch_trap_init) {
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if (x86_quirks->arch_trap_init())
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return;
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}
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}
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static struct irqaction irq0 = {
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.handler = timer_interrupt,
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.flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
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.mask = CPU_MASK_NONE,
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.name = "timer"
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};
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/**
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* pre_time_init_hook - do any specific initialisations before.
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*
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**/
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void __init pre_time_init_hook(void)
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{
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if (x86_quirks->arch_pre_time_init)
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x86_quirks->arch_pre_time_init();
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}
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/**
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* time_init_hook - do any specific initialisations for the system timer.
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*
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* Description:
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* Must plug the system timer interrupt source at HZ into the IRQ listed
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* in irq_vectors.h:TIMER_IRQ
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**/
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void __init time_init_hook(void)
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{
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if (x86_quirks->arch_time_init) {
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/*
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* A nonzero return code does not mean failure, it means
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* that the architecture quirk does not want any
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* generic (timer) setup to be performed after this:
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*/
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if (x86_quirks->arch_time_init())
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return;
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}
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irq0.mask = cpumask_of_cpu(0);
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setup_irq(0, &irq0);
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}
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#ifdef CONFIG_MCA
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/**
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* mca_nmi_hook - hook into MCA specific NMI chain
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*
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* Description:
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* The MCA (Microchannel Architecture) has an NMI chain for NMI sources
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* along the MCA bus. Use this to hook into that chain if you will need
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* it.
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**/
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void mca_nmi_hook(void)
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{
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/*
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* If I recall correctly, there's a whole bunch of other things that
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* we can do to check for NMI problems, but that's all I know about
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* at the moment.
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*/
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pr_warning("NMI generated from unknown source!\n");
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}
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#endif
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static __init int no_ipi_broadcast(char *str)
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{
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get_option(&str, &no_broadcast);
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pr_info("Using %s mode\n",
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no_broadcast ? "No IPI Broadcast" : "IPI Broadcast");
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return 1;
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}
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__setup("no_ipi_broadcast=", no_ipi_broadcast);
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static int __init print_ipi_mode(void)
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{
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pr_info("Using IPI %s mode\n",
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no_broadcast ? "No-Shortcut" : "Shortcut");
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return 0;
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}
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late_initcall(print_ipi_mode);
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