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>
16 #include <asm/lowcore.h>
17 #include <asm/s390_ext.h>
21 * Simple hash strategy: index = code & 0xff;
22 * ext_int_hash[index] is the start of the list for all external interrupts
23 * that hash to this index. With the current set of external interrupts
24 * (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000
25 * iucv and 0x2603 pfault) this is always the first element.
27 ext_int_info_t *ext_int_hash[256] = { 0, };
29 int register_external_interrupt(__u16 code, ext_int_handler_t handler)
34 p = (ext_int_info_t *) kmalloc(sizeof(ext_int_info_t), GFP_ATOMIC);
40 p->next = ext_int_hash[index];
41 ext_int_hash[index] = p;
45 int register_early_external_interrupt(__u16 code, ext_int_handler_t handler,
55 p->next = ext_int_hash[index];
56 ext_int_hash[index] = p;
60 int unregister_external_interrupt(__u16 code, ext_int_handler_t handler)
62 ext_int_info_t *p, *q;
67 p = ext_int_hash[index];
69 if (p->code == code && p->handler == handler)
79 ext_int_hash[index] = p->next;
84 int unregister_early_external_interrupt(__u16 code, ext_int_handler_t handler,
90 if (p == NULL || p->code != code || p->handler != handler)
93 q = ext_int_hash[index];
104 ext_int_hash[index] = p->next;
108 void do_extint(struct pt_regs *regs, unsigned short code)
114 asm volatile ("mc 0,0");
115 if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
117 kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
119 for (p = ext_int_hash[index]; p; p = p->next) {
120 if (likely(p->code == code)) {
121 if (likely(p->handler))
122 p->handler(regs, code);
128 EXPORT_SYMBOL(register_external_interrupt);
129 EXPORT_SYMBOL(unregister_external_interrupt);