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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pic.c (1451B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright 2008 Freescale Semiconductor, Inc.
      4 */
      5
      6#include <linux/stddef.h>
      7#include <linux/kernel.h>
      8#include <linux/interrupt.h>
      9#include <linux/of_irq.h>
     10#include <linux/of_platform.h>
     11
     12#include <asm/mpic.h>
     13#include <asm/i8259.h>
     14
     15#ifdef CONFIG_PPC_I8259
     16static void mpc86xx_8259_cascade(struct irq_desc *desc)
     17{
     18	struct irq_chip *chip = irq_desc_get_chip(desc);
     19	unsigned int cascade_irq = i8259_irq();
     20
     21	if (cascade_irq)
     22		generic_handle_irq(cascade_irq);
     23
     24	chip->irq_eoi(&desc->irq_data);
     25}
     26#endif	/* CONFIG_PPC_I8259 */
     27
     28void __init mpc86xx_init_irq(void)
     29{
     30#ifdef CONFIG_PPC_I8259
     31	struct device_node *np;
     32	struct device_node *cascade_node = NULL;
     33	int cascade_irq;
     34#endif
     35
     36	struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
     37			MPIC_SINGLE_DEST_CPU,
     38			0, 256, " MPIC     ");
     39	BUG_ON(mpic == NULL);
     40
     41	mpic_init(mpic);
     42
     43#ifdef CONFIG_PPC_I8259
     44	/* Initialize i8259 controller */
     45	for_each_node_by_type(np, "interrupt-controller")
     46		if (of_device_is_compatible(np, "chrp,iic")) {
     47			cascade_node = np;
     48			break;
     49		}
     50
     51	if (cascade_node == NULL) {
     52		printk(KERN_DEBUG "Could not find i8259 PIC\n");
     53		return;
     54	}
     55
     56	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
     57	if (!cascade_irq) {
     58		printk(KERN_ERR "Failed to map cascade interrupt\n");
     59		return;
     60	}
     61
     62	i8259_init(cascade_node, 0);
     63	of_node_put(cascade_node);
     64
     65	irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade);
     66#endif
     67}