2 * arch/s390/kernel/s390_ext.c
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Holger Smolinski (Holger.Smolinski@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/errno.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/interrupt.h>
17 #include <asm/lowcore.h>
18 #include <asm/s390_ext.h>
22 * Simple hash strategy: index = code & 0xff;
23 * ext_int_hash[index] is the start of the list for all external interrupts
24 * that hash to this index. With the current set of external interrupts
25 * (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000
26 * iucv and 0x2603 pfault) this is always the first element.
28 ext_int_info_t *ext_int_hash[256] = { 0, };
30 int register_external_interrupt(__u16 code, ext_int_handler_t handler)
35 p = (ext_int_info_t *) kmalloc(sizeof(ext_int_info_t), GFP_ATOMIC);
41 p->next = ext_int_hash[index];
42 ext_int_hash[index] = p;
46 int register_early_external_interrupt(__u16 code, ext_int_handler_t handler,
56 p->next = ext_int_hash[index];
57 ext_int_hash[index] = p;
61 int unregister_external_interrupt(__u16 code, ext_int_handler_t handler)
63 ext_int_info_t *p, *q;
68 p = ext_int_hash[index];
70 if (p->code == code && p->handler == handler)
80 ext_int_hash[index] = p->next;
85 int unregister_early_external_interrupt(__u16 code, ext_int_handler_t handler,
91 if (p == NULL || p->code != code || p->handler != handler)
94 q = ext_int_hash[index];
105 ext_int_hash[index] = p->next;
109 void do_extint(struct pt_regs *regs, unsigned short code)
115 asm volatile ("mc 0,0");
116 if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
118 kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
120 for (p = ext_int_hash[index]; p; p = p->next) {
121 if (likely(p->code == code)) {
122 if (likely(p->handler))
123 p->handler(regs, code);
129 EXPORT_SYMBOL(register_external_interrupt);
130 EXPORT_SYMBOL(unregister_external_interrupt);