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1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/irq.c | |
3 | * | |
4 | * S390 version | |
5 | * Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), | |
7 | * | |
8 | * This file contains interrupt related functions. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/kernel_stat.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/seq_file.h> | |
16 | #include <linux/cpu.h> | |
17 | ||
18 | /* | |
19 | * show_interrupts is needed by /proc/interrupts. | |
20 | */ | |
21 | int show_interrupts(struct seq_file *p, void *v) | |
22 | { | |
23 | static const char *intrclass_names[] = { "EXT", "I/O", }; | |
24 | int i = *(loff_t *) v, j; | |
25 | ||
26 | if (i == 0) { | |
27 | seq_puts(p, " "); | |
28 | for_each_online_cpu(j) | |
29 | seq_printf(p, "CPU%d ",j); | |
30 | seq_putc(p, '\n'); | |
31 | } | |
32 | ||
33 | if (i < NR_IRQS) { | |
34 | seq_printf(p, "%s: ", intrclass_names[i]); | |
35 | #ifndef CONFIG_SMP | |
36 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
37 | #else | |
38 | for_each_online_cpu(j) | |
39 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); | |
40 | #endif | |
41 | seq_putc(p, '\n'); | |
42 | ||
43 | } | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
48 | /* | |
49 | * For compatibilty only. S/390 specific setup of interrupts et al. is done | |
50 | * much later in init_channel_subsystem(). | |
51 | */ | |
52 | void __init | |
53 | init_IRQ(void) | |
54 | { | |
55 | /* nothing... */ | |
56 | } | |
57 | ||
58 | /* | |
59 | * Switch to the asynchronous interrupt stack for softirq execution. | |
60 | */ | |
61 | extern void __do_softirq(void); | |
62 | ||
63 | asmlinkage void do_softirq(void) | |
64 | { | |
65 | unsigned long flags, old, new; | |
66 | ||
67 | if (in_interrupt()) | |
68 | return; | |
69 | ||
70 | local_irq_save(flags); | |
71 | ||
72 | account_system_vtime(current); | |
73 | ||
74 | local_bh_disable(); | |
75 | ||
76 | if (local_softirq_pending()) { | |
77 | /* Get current stack pointer. */ | |
78 | asm volatile("la %0,0(15)" : "=a" (old)); | |
79 | /* Check against async. stack address range. */ | |
80 | new = S390_lowcore.async_stack; | |
81 | if (((new - old) >> (PAGE_SHIFT + THREAD_ORDER)) != 0) { | |
82 | /* Need to switch to the async. stack. */ | |
83 | new -= STACK_FRAME_OVERHEAD; | |
84 | ((struct stack_frame *) new)->back_chain = old; | |
85 | ||
86 | asm volatile(" la 15,0(%0)\n" | |
87 | " basr 14,%2\n" | |
88 | " la 15,0(%1)\n" | |
89 | : : "a" (new), "a" (old), | |
90 | "a" (__do_softirq) | |
91 | : "0", "1", "2", "3", "4", "5", "14", | |
92 | "cc", "memory" ); | |
93 | } else | |
94 | /* We are already on the async stack. */ | |
95 | __do_softirq(); | |
96 | } | |
97 | ||
98 | account_system_vtime(current); | |
99 | ||
100 | __local_bh_enable(); | |
101 | ||
102 | local_irq_restore(flags); | |
103 | } | |
104 | ||
105 | EXPORT_SYMBOL(do_softirq); |