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9cfb9b3c3a
Distinguish the cputime of the idle process where idle is actually using cpu cycles from the cputime where idle is sleeping on an enabled wait psw. The former is accounted as system time, the later as idle time. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/*
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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/cpu.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_regs.h>
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#include <asm/irq.h>
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#include "entry.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] = { NULL, };
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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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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 = 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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index = ext_hash(code);
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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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index = ext_hash(code);
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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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index = ext_hash(code);
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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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index = ext_hash(code);
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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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struct pt_regs *old_regs;
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old_regs = set_irq_regs(regs);
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s390_idle_check();
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irq_enter();
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if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
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/* Serve timer interrupts first. */
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clock_comparator_work();
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kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
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index = ext_hash(code);
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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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p->handler(code);
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}
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irq_exit();
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set_irq_regs(old_regs);
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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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