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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 00:20:36 +0200
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 00:20:36 +0200
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/s390/kernel/irq.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/s390/kernel/irq.c')
-rw-r--r--arch/s390/kernel/irq.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
new file mode 100644
index 000000000000..480b6a5fef3a
--- /dev/null
+++ b/arch/s390/kernel/irq.c
@@ -0,0 +1,105 @@
+/*
+ * 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);