cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hvc_irq.c (1049B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright IBM Corp. 2001,2008
      4 *
      5 * This file contains the IRQ specific code for hvc_console
      6 *
      7 */
      8
      9#include <linux/interrupt.h>
     10
     11#include "hvc_console.h"
     12
     13static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
     14{
     15	/* if hvc_poll request a repoll, then kick the hvcd thread */
     16	if (hvc_poll(dev_instance))
     17		hvc_kick();
     18
     19	/*
     20	 * We're safe to always return IRQ_HANDLED as the hvcd thread will
     21	 * iterate through each hvc_struct.
     22	 */
     23	return IRQ_HANDLED;
     24}
     25
     26/*
     27 * For IRQ based systems these callbacks can be used
     28 */
     29int notifier_add_irq(struct hvc_struct *hp, int irq)
     30{
     31	int rc;
     32
     33	if (!irq) {
     34		hp->irq_requested = 0;
     35		return 0;
     36	}
     37	rc = request_irq(irq, hvc_handle_interrupt, hp->flags,
     38			"hvc_console", hp);
     39	if (!rc)
     40		hp->irq_requested = 1;
     41	return rc;
     42}
     43
     44void notifier_del_irq(struct hvc_struct *hp, int irq)
     45{
     46	if (!hp->irq_requested)
     47		return;
     48	free_irq(irq, hp);
     49	hp->irq_requested = 0;
     50}
     51
     52void notifier_hangup_irq(struct hvc_struct *hp, int irq)
     53{
     54	notifier_del_irq(hp, irq);
     55}