107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
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/*
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* arch/s390/kernel/irq.c
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*
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* Copyright IBM Corp. 2004,2007
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Thomas Spatzier (tspat@de.ibm.com)
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*
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* This file contains interrupt related functions.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/kernel_stat.h>
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#include <linux/interrupt.h>
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#include <linux/seq_file.h>
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#include <linux/cpu.h>
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#include <linux/proc_fs.h>
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#include <linux/profile.h>
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/*
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* show_interrupts is needed by /proc/interrupts.
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*/
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int show_interrupts(struct seq_file *p, void *v)
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{
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static const char *intrclass_names[] = { "EXT", "I/O", };
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int i = *(loff_t *) v, j;
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get_online_cpus();
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if (i == 0) {
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seq_puts(p, " ");
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for_each_online_cpu(j)
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seq_printf(p, "CPU%d ",j);
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seq_putc(p, '\n');
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}
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if (i < NR_IRQS) {
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seq_printf(p, "%s: ", intrclass_names[i]);
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#ifndef CONFIG_SMP
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seq_printf(p, "%10u ", kstat_irqs(i));
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#else
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
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#endif
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seq_putc(p, '\n');
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}
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put_online_cpus();
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return 0;
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}
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/*
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* For compatibilty only. S/390 specific setup of interrupts et al. is done
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* much later in init_channel_subsystem().
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*/
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void __init
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init_IRQ(void)
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{
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/* nothing... */
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}
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/*
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* Switch to the asynchronous interrupt stack for softirq execution.
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*/
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asmlinkage void do_softirq(void)
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{
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unsigned long flags, old, new;
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if (in_interrupt())
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return;
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local_irq_save(flags);
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if (local_softirq_pending()) {
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/* Get current stack pointer. */
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asm volatile("la %0,0(15)" : "=a" (old));
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/* Check against async. stack address range. */
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new = S390_lowcore.async_stack;
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if (((new - old) >> (PAGE_SHIFT + THREAD_ORDER)) != 0) {
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/* Need to switch to the async. stack. */
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new -= STACK_FRAME_OVERHEAD;
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((struct stack_frame *) new)->back_chain = old;
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asm volatile(" la 15,0(%0)\n"
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" basr 14,%2\n"
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" la 15,0(%1)\n"
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: : "a" (new), "a" (old),
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"a" (__do_softirq)
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: "0", "1", "2", "3", "4", "5", "14",
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"cc", "memory" );
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} else
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/* We are already on the async stack. */
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__do_softirq();
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}
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local_irq_restore(flags);
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}
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#ifdef CONFIG_PROC_FS
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void init_irq_proc(void)
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{
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struct proc_dir_entry *root_irq_dir;
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root_irq_dir = proc_mkdir("irq", NULL);
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create_prof_cpu_mask(root_irq_dir);
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}
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#endif
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