2005-04-17 00:20:36 +02:00
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/*
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* arch/s390/kernel/s390_ext.c
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Holger Smolinski (Holger.Smolinski@de.ibm.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/kernel_stat.h>
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#include <linux/interrupt.h>
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#include <asm/lowcore.h>
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#include <asm/s390_ext.h>
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#include <asm/irq.h>
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/*
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* ext_int_hash[index] is the start of the list for all external interrupts
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* that hash to this index. With the current set of external interrupts
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* (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000
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* iucv and 0x2603 pfault) this is always the first element.
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*/
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ext_int_info_t *ext_int_hash[256] = { 0, };
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2005-07-27 20:45:00 +02:00
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static inline int ext_hash(__u16 code)
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{
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return (code + (code >> 9)) & 0xff;
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}
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2005-04-17 00:20:36 +02:00
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int register_external_interrupt(__u16 code, ext_int_handler_t handler)
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{
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ext_int_info_t *p;
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int index;
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p = (ext_int_info_t *) kmalloc(sizeof(ext_int_info_t), GFP_ATOMIC);
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if (p == NULL)
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return -ENOMEM;
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p->code = code;
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p->handler = handler;
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2005-07-27 20:45:00 +02:00
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index = ext_hash(code);
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2005-04-17 00:20:36 +02:00
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p->next = ext_int_hash[index];
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ext_int_hash[index] = p;
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return 0;
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}
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int register_early_external_interrupt(__u16 code, ext_int_handler_t handler,
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ext_int_info_t *p)
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{
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int index;
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if (p == NULL)
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return -EINVAL;
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p->code = code;
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p->handler = handler;
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2005-07-27 20:45:00 +02:00
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index = ext_hash(code);
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2005-04-17 00:20:36 +02:00
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p->next = ext_int_hash[index];
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ext_int_hash[index] = p;
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return 0;
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}
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int unregister_external_interrupt(__u16 code, ext_int_handler_t handler)
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{
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ext_int_info_t *p, *q;
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int index;
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2005-07-27 20:45:00 +02:00
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index = ext_hash(code);
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2005-04-17 00:20:36 +02:00
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q = NULL;
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p = ext_int_hash[index];
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while (p != NULL) {
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if (p->code == code && p->handler == handler)
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break;
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q = p;
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p = p->next;
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}
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if (p == NULL)
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return -ENOENT;
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if (q != NULL)
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q->next = p->next;
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else
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ext_int_hash[index] = p->next;
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kfree(p);
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return 0;
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}
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int unregister_early_external_interrupt(__u16 code, ext_int_handler_t handler,
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ext_int_info_t *p)
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{
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ext_int_info_t *q;
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int index;
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if (p == NULL || p->code != code || p->handler != handler)
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return -EINVAL;
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2005-07-27 20:45:00 +02:00
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index = ext_hash(code);
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2005-04-17 00:20:36 +02:00
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q = ext_int_hash[index];
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if (p != q) {
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while (q != NULL) {
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if (q->next == p)
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break;
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q = q->next;
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}
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if (q == NULL)
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return -ENOENT;
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q->next = p->next;
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} else
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ext_int_hash[index] = p->next;
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return 0;
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}
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void do_extint(struct pt_regs *regs, unsigned short code)
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{
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ext_int_info_t *p;
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int index;
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irq_enter();
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asm volatile ("mc 0,0");
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if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
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/**
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* Make sure that the i/o interrupt did not "overtake"
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* the last HZ timer interrupt.
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*/
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account_ticks(regs);
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kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
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2005-07-27 20:45:00 +02:00
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index = ext_hash(code);
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2005-04-17 00:20:36 +02:00
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for (p = ext_int_hash[index]; p; p = p->next) {
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if (likely(p->code == code)) {
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if (likely(p->handler))
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p->handler(regs, code);
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}
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}
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irq_exit();
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}
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EXPORT_SYMBOL(register_external_interrupt);
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EXPORT_SYMBOL(unregister_external_interrupt);
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