mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-20 00:11:22 +00:00
b1b7509185
Get rid of register/unregister_early_external_interrupt() and clean up the code while at it. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
|
|
* Copyright IBM Corp. 1999,2010
|
|
* Author(s): Holger Smolinski <Holger.Smolinski@de.ibm.com>,
|
|
* Martin Schwidefsky <schwidefsky@de.ibm.com>,
|
|
*/
|
|
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/ftrace.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/s390_ext.h>
|
|
#include <asm/irq_regs.h>
|
|
#include <asm/cputime.h>
|
|
#include <asm/lowcore.h>
|
|
#include <asm/irq.h>
|
|
#include "entry.h"
|
|
|
|
struct ext_int_info {
|
|
struct ext_int_info *next;
|
|
ext_int_handler_t handler;
|
|
__u16 code;
|
|
};
|
|
|
|
/*
|
|
* ext_int_hash[index] is the start of the list for all external interrupts
|
|
* that hash to this index. With the current set of external interrupts
|
|
* (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000
|
|
* iucv and 0x2603 pfault) this is always the first element.
|
|
*/
|
|
static struct ext_int_info *ext_int_hash[256];
|
|
|
|
static inline int ext_hash(__u16 code)
|
|
{
|
|
return (code + (code >> 9)) & 0xff;
|
|
}
|
|
|
|
int register_external_interrupt(__u16 code, ext_int_handler_t handler)
|
|
{
|
|
struct ext_int_info *p;
|
|
int index;
|
|
|
|
p = kmalloc(sizeof(*p), GFP_ATOMIC);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
p->code = code;
|
|
p->handler = handler;
|
|
index = ext_hash(code);
|
|
p->next = ext_int_hash[index];
|
|
ext_int_hash[index] = p;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(register_external_interrupt);
|
|
|
|
int unregister_external_interrupt(__u16 code, ext_int_handler_t handler)
|
|
{
|
|
struct ext_int_info *p, *q;
|
|
int index;
|
|
|
|
index = ext_hash(code);
|
|
q = NULL;
|
|
p = ext_int_hash[index];
|
|
while (p) {
|
|
if (p->code == code && p->handler == handler)
|
|
break;
|
|
q = p;
|
|
p = p->next;
|
|
}
|
|
if (!p)
|
|
return -ENOENT;
|
|
if (q)
|
|
q->next = p->next;
|
|
else
|
|
ext_int_hash[index] = p->next;
|
|
kfree(p);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(unregister_external_interrupt);
|
|
|
|
void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code,
|
|
unsigned int param32, unsigned long param64)
|
|
{
|
|
struct pt_regs *old_regs;
|
|
unsigned short code;
|
|
struct ext_int_info *p;
|
|
int index;
|
|
|
|
code = (unsigned short) ext_int_code;
|
|
old_regs = set_irq_regs(regs);
|
|
s390_idle_check(regs, S390_lowcore.int_clock,
|
|
S390_lowcore.async_enter_timer);
|
|
irq_enter();
|
|
if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
|
|
/* Serve timer interrupts first. */
|
|
clock_comparator_work();
|
|
kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
|
|
if (code != 0x1004)
|
|
__get_cpu_var(s390_idle).nohz_delay = 1;
|
|
index = ext_hash(code);
|
|
for (p = ext_int_hash[index]; p; p = p->next) {
|
|
if (likely(p->code == code))
|
|
p->handler(ext_int_code, param32, param64);
|
|
}
|
|
irq_exit();
|
|
set_irq_regs(old_regs);
|
|
}
|