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/*

 *  arch/s390/kernel/irq.c

 *

 *    Copyright IBM Corp. 2004,2007

 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),

 *               Thomas Spatzier (tspat@de.ibm.com)

 *

 * This file contains interrupt related functions.

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/kernel_stat.h>

#include <linux/interrupt.h>

#include <linux/seq_file.h>

#include <linux/cpu.h>

#include <linux/proc_fs.h>

#include <linux/profile.h>

/*

 * show_interrupts is needed by /proc/interrupts.

 */

int show_interrupts(struct seq_file *p, void *v)

{

        static const char *intrclass_names[] = { "EXT", "I/O", };

        int i = *(loff_t *) v, j;

        if (i == 0) {

                seq_puts(p, "           ");

                for_each_online_cpu(j)

                        seq_printf(p, "CPU%d       ",j);

                seq_putc(p, '\n');

        }

        if (i < NR_IRQS) {

                seq_printf(p, "%s: ", intrclass_names[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_putc(p, '\n');

        }

        return 0;

}

/*

 * For compatibilty only. S/390 specific setup of interrupts et al. is done

 * much later in init_channel_subsystem().

 */

void __init

init_IRQ(void)

{

        /* nothing... */

}

/*

 * Switch to the asynchronous interrupt stack for softirq execution.

 */

extern void __do_softirq(void);

asmlinkage void do_softirq(void)

{

        unsigned long flags, old, new;

        if (in_interrupt())

                return;

        local_irq_save(flags);

        if (local_softirq_pending()) {

                /* Get current stack pointer. */

                asm volatile("la %0,0(15)" : "=a" (old));

                /* Check against async. stack address range. */

                new = S390_lowcore.async_stack;

                if (((new - old) >> (PAGE_SHIFT + THREAD_ORDER)) != 0) {

                        /* Need to switch to the async. stack. */

                        new -= STACK_FRAME_OVERHEAD;

                        ((struct stack_frame *) new)->back_chain = old;

                        asm volatile("   la    15,0(%0)\n"

                                     "   basr  14,%2\n"

                                     "   la    15,0(%1)\n"

                                     : : "a" (new), "a" (old),

                                         "a" (__do_softirq)

                                     : "0", "1", "2", "3", "4", "5", "14",

                                       "cc", "memory" );

                } else

                        /* We are already on the async stack. */

                        __do_softirq();

        }

        local_irq_restore(flags);

}

void init_irq_proc(void)

{

        struct proc_dir_entry *root_irq_dir;

        root_irq_dir = proc_mkdir("irq", NULL);

        create_prof_cpu_mask(root_irq_dir);

}