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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/s390/kernel/irq.c | |
download | linux-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.c | 105 |
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); |