106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
/*
|
|
* arch/s390/kernel/irq.c
|
|
*
|
|
* S390 version
|
|
* Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation
|
|
* Author(s): Martin Schwidefsky (schwidefsky@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>
|
|
|
|
/*
|
|
* 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);
|
|
|
|
account_system_vtime(current);
|
|
|
|
local_bh_disable();
|
|
|
|
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();
|
|
}
|
|
|
|
account_system_vtime(current);
|
|
|
|
__local_bh_enable();
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
EXPORT_SYMBOL(do_softirq);
|