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author | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:12:54 +0200 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:12:54 +0200 |
commit | b352b7fe2271c48600a71f50546b8a3567a0e7fe (patch) | |
tree | e79ce61ae4e71566eea8a60d0d438feea5c2b18f /arch/i386/kernel/irq.c | |
parent | 8260dc37916c12b36e9732a8fa5bfa8c5fa8f0c4 (diff) | |
download | kernel_samsung_espresso10-b352b7fe2271c48600a71f50546b8a3567a0e7fe.zip kernel_samsung_espresso10-b352b7fe2271c48600a71f50546b8a3567a0e7fe.tar.gz kernel_samsung_espresso10-b352b7fe2271c48600a71f50546b8a3567a0e7fe.tar.bz2 |
i386: prepare shared kernel/irq.c
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/i386/kernel/irq.c')
-rw-r--r-- | arch/i386/kernel/irq.c | 343 |
1 files changed, 0 insertions, 343 deletions
diff --git a/arch/i386/kernel/irq.c b/arch/i386/kernel/irq.c deleted file mode 100644 index dd2b97f..0000000 --- a/arch/i386/kernel/irq.c +++ /dev/null @@ -1,343 +0,0 @@ -/* - * linux/arch/i386/kernel/irq.c - * - * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar - * - * This file contains the lowest level x86-specific interrupt - * entry, irq-stacks and irq statistics code. All the remaining - * irq logic is done by the generic kernel/irq/ code and - * by the x86-specific irq controller code. (e.g. i8259.c and - * io_apic.c.) - */ - -#include <linux/module.h> -#include <linux/seq_file.h> -#include <linux/interrupt.h> -#include <linux/kernel_stat.h> -#include <linux/notifier.h> -#include <linux/cpu.h> -#include <linux/delay.h> - -#include <asm/apic.h> -#include <asm/uaccess.h> - -DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); -EXPORT_PER_CPU_SYMBOL(irq_stat); - -DEFINE_PER_CPU(struct pt_regs *, irq_regs); -EXPORT_PER_CPU_SYMBOL(irq_regs); - -/* - * 'what should we do if we get a hw irq event on an illegal vector'. - * each architecture has to answer this themselves. - */ -void ack_bad_irq(unsigned int irq) -{ - printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq); - -#ifdef CONFIG_X86_LOCAL_APIC - /* - * Currently unexpected vectors happen only on SMP and APIC. - * We _must_ ack these because every local APIC has only N - * irq slots per priority level, and a 'hanging, unacked' IRQ - * holds up an irq slot - in excessive cases (when multiple - * unexpected vectors occur) that might lock up the APIC - * completely. - * But only ack when the APIC is enabled -AK - */ - if (cpu_has_apic) - ack_APIC_irq(); -#endif -} - -#ifdef CONFIG_4KSTACKS -/* - * per-CPU IRQ handling contexts (thread information and stack) - */ -union irq_ctx { - struct thread_info tinfo; - u32 stack[THREAD_SIZE/sizeof(u32)]; -}; - -static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly; -static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly; -#endif - -/* - * do_IRQ handles all normal device IRQ's (the special - * SMP cross-CPU interrupts have their own specific - * handlers). - */ -fastcall unsigned int do_IRQ(struct pt_regs *regs) -{ - struct pt_regs *old_regs; - /* high bit used in ret_from_ code */ - int irq = ~regs->orig_eax; - struct irq_desc *desc = irq_desc + irq; -#ifdef CONFIG_4KSTACKS - union irq_ctx *curctx, *irqctx; - u32 *isp; -#endif - - if (unlikely((unsigned)irq >= NR_IRQS)) { - printk(KERN_EMERG "%s: cannot handle IRQ %d\n", - __FUNCTION__, irq); - BUG(); - } - - old_regs = set_irq_regs(regs); - irq_enter(); -#ifdef CONFIG_DEBUG_STACKOVERFLOW - /* Debugging check for stack overflow: is there less than 1KB free? */ - { - long esp; - - __asm__ __volatile__("andl %%esp,%0" : - "=r" (esp) : "0" (THREAD_SIZE - 1)); - if (unlikely(esp < (sizeof(struct thread_info) + STACK_WARN))) { - printk("do_IRQ: stack overflow: %ld\n", - esp - sizeof(struct thread_info)); - dump_stack(); - } - } -#endif - -#ifdef CONFIG_4KSTACKS - - curctx = (union irq_ctx *) current_thread_info(); - irqctx = hardirq_ctx[smp_processor_id()]; - - /* - * this is where we switch to the IRQ stack. However, if we are - * already using the IRQ stack (because we interrupted a hardirq - * handler) we can't do that and just have to keep using the - * current stack (which is the irq stack already after all) - */ - if (curctx != irqctx) { - int arg1, arg2, ebx; - - /* build the stack frame on the IRQ stack */ - isp = (u32*) ((char*)irqctx + sizeof(*irqctx)); - irqctx->tinfo.task = curctx->tinfo.task; - irqctx->tinfo.previous_esp = current_stack_pointer; - - /* - * Copy the softirq bits in preempt_count so that the - * softirq checks work in the hardirq context. - */ - irqctx->tinfo.preempt_count = - (irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) | - (curctx->tinfo.preempt_count & SOFTIRQ_MASK); - - asm volatile( - " xchgl %%ebx,%%esp \n" - " call *%%edi \n" - " movl %%ebx,%%esp \n" - : "=a" (arg1), "=d" (arg2), "=b" (ebx) - : "0" (irq), "1" (desc), "2" (isp), - "D" (desc->handle_irq) - : "memory", "cc" - ); - } else -#endif - desc->handle_irq(irq, desc); - - irq_exit(); - set_irq_regs(old_regs); - return 1; -} - -#ifdef CONFIG_4KSTACKS - -static char softirq_stack[NR_CPUS * THREAD_SIZE] - __attribute__((__section__(".bss.page_aligned"))); - -static char hardirq_stack[NR_CPUS * THREAD_SIZE] - __attribute__((__section__(".bss.page_aligned"))); - -/* - * allocate per-cpu stacks for hardirq and for softirq processing - */ -void irq_ctx_init(int cpu) -{ - union irq_ctx *irqctx; - - if (hardirq_ctx[cpu]) - return; - - irqctx = (union irq_ctx*) &hardirq_stack[cpu*THREAD_SIZE]; - irqctx->tinfo.task = NULL; - irqctx->tinfo.exec_domain = NULL; - irqctx->tinfo.cpu = cpu; - irqctx->tinfo.preempt_count = HARDIRQ_OFFSET; - irqctx->tinfo.addr_limit = MAKE_MM_SEG(0); - - hardirq_ctx[cpu] = irqctx; - - irqctx = (union irq_ctx*) &softirq_stack[cpu*THREAD_SIZE]; - irqctx->tinfo.task = NULL; - irqctx->tinfo.exec_domain = NULL; - irqctx->tinfo.cpu = cpu; - irqctx->tinfo.preempt_count = 0; - irqctx->tinfo.addr_limit = MAKE_MM_SEG(0); - - softirq_ctx[cpu] = irqctx; - - printk("CPU %u irqstacks, hard=%p soft=%p\n", - cpu,hardirq_ctx[cpu],softirq_ctx[cpu]); -} - -void irq_ctx_exit(int cpu) -{ - hardirq_ctx[cpu] = NULL; -} - -extern asmlinkage void __do_softirq(void); - -asmlinkage void do_softirq(void) -{ - unsigned long flags; - struct thread_info *curctx; - union irq_ctx *irqctx; - u32 *isp; - - if (in_interrupt()) - return; - - local_irq_save(flags); - - if (local_softirq_pending()) { - curctx = current_thread_info(); - irqctx = softirq_ctx[smp_processor_id()]; - irqctx->tinfo.task = curctx->task; - irqctx->tinfo.previous_esp = current_stack_pointer; - - /* build the stack frame on the softirq stack */ - isp = (u32*) ((char*)irqctx + sizeof(*irqctx)); - - asm volatile( - " xchgl %%ebx,%%esp \n" - " call __do_softirq \n" - " movl %%ebx,%%esp \n" - : "=b"(isp) - : "0"(isp) - : "memory", "cc", "edx", "ecx", "eax" - ); - /* - * Shouldnt happen, we returned above if in_interrupt(): - */ - WARN_ON_ONCE(softirq_count()); - } - - local_irq_restore(flags); -} - -EXPORT_SYMBOL(do_softirq); -#endif - -/* - * Interrupt statistics: - */ - -atomic_t irq_err_count; - -/* - * /proc/interrupts printing: - */ - -int show_interrupts(struct seq_file *p, void *v) -{ - int i = *(loff_t *) v, j; - struct irqaction * action; - unsigned long flags; - - if (i == 0) { - seq_printf(p, " "); - for_each_online_cpu(j) - seq_printf(p, "CPU%-8d",j); - seq_putc(p, '\n'); - } - - if (i < NR_IRQS) { - spin_lock_irqsave(&irq_desc[i].lock, flags); - action = irq_desc[i].action; - if (!action) - goto skip; - seq_printf(p, "%3d: ",i); -#ifndef CONFIG_SMP - seq_printf(p, "%10u ", kstat_irqs(i)); -#else - for_each_online_cpu(j) - seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); -#endif - seq_printf(p, " %8s", irq_desc[i].chip->name); - seq_printf(p, "-%-8s", irq_desc[i].name); - seq_printf(p, " %s", action->name); - - for (action=action->next; action; action = action->next) - seq_printf(p, ", %s", action->name); - - seq_putc(p, '\n'); -skip: - spin_unlock_irqrestore(&irq_desc[i].lock, flags); - } else if (i == NR_IRQS) { - seq_printf(p, "NMI: "); - for_each_online_cpu(j) - seq_printf(p, "%10u ", nmi_count(j)); - seq_putc(p, '\n'); -#ifdef CONFIG_X86_LOCAL_APIC - seq_printf(p, "LOC: "); - for_each_online_cpu(j) - seq_printf(p, "%10u ", - per_cpu(irq_stat,j).apic_timer_irqs); - seq_putc(p, '\n'); -#endif - seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); -#if defined(CONFIG_X86_IO_APIC) - seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count)); -#endif - } - return 0; -} - -#ifdef CONFIG_HOTPLUG_CPU -#include <mach_apic.h> - -void fixup_irqs(cpumask_t map) -{ - unsigned int irq; - static int warned; - - for (irq = 0; irq < NR_IRQS; irq++) { - cpumask_t mask; - if (irq == 2) - continue; - - cpus_and(mask, irq_desc[irq].affinity, map); - if (any_online_cpu(mask) == NR_CPUS) { - printk("Breaking affinity for irq %i\n", irq); - mask = map; - } - if (irq_desc[irq].chip->set_affinity) - irq_desc[irq].chip->set_affinity(irq, mask); - else if (irq_desc[irq].action && !(warned++)) - printk("Cannot set affinity for irq %i\n", irq); - } - -#if 0 - barrier(); - /* Ingo Molnar says: "after the IO-APIC masks have been redirected - [note the nop - the interrupt-enable boundary on x86 is two - instructions from sti] - to flush out pending hardirqs and - IPIs. After this point nothing is supposed to reach this CPU." */ - __asm__ __volatile__("sti; nop; cli"); - barrier(); -#else - /* That doesn't seem sufficient. Give it 1ms. */ - local_irq_enable(); - mdelay(1); - local_irq_disable(); -#endif -} -#endif - |