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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ints.c (4061B)

      1/*
      2 * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
      3 *
      4 * This file is subject to the terms and conditions of the GNU General Public
      5 * License.  See the file COPYING in the main directory of this archive
      6 * for more details.
      7 */
      8
      9#include <linux/module.h>
     10#include <linux/types.h>
     11#include <linux/sched.h>
     12#include <linux/interrupt.h>
     13#include <linux/errno.h>
     14#include <linux/init.h>
     15#include <linux/irq.h>
     16
     17#include <asm/setup.h>
     18#include <asm/irq.h>
     19#include <asm/traps.h>
     20#include <asm/page.h>
     21#include <asm/machdep.h>
     22#include <asm/cacheflush.h>
     23#include <asm/irq_regs.h>
     24
     25#ifdef CONFIG_Q40
     26#include <asm/q40ints.h>
     27#endif
     28
     29extern u32 auto_irqhandler_fixup[];
     30extern u16 user_irqvec_fixup[];
     31
     32static int m68k_first_user_vec;
     33
     34static struct irq_chip auto_irq_chip = {
     35	.name		= "auto",
     36	.irq_startup	= m68k_irq_startup,
     37	.irq_shutdown	= m68k_irq_shutdown,
     38};
     39
     40static struct irq_chip user_irq_chip = {
     41	.name		= "user",
     42	.irq_startup	= m68k_irq_startup,
     43	.irq_shutdown	= m68k_irq_shutdown,
     44};
     45
     46/*
     47 * void init_IRQ(void)
     48 *
     49 * Parameters:	None
     50 *
     51 * Returns:	Nothing
     52 *
     53 * This function should be called during kernel startup to initialize
     54 * the IRQ handling routines.
     55 */
     56
     57void __init init_IRQ(void)
     58{
     59	int i;
     60
     61	for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
     62		irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);
     63
     64	mach_init_IRQ();
     65}
     66
     67/**
     68 * m68k_setup_auto_interrupt
     69 * @handler: called from auto vector interrupts
     70 *
     71 * setup the handler to be called from auto vector interrupts instead of the
     72 * standard do_IRQ(), it will be called with irq numbers in the range
     73 * from IRQ_AUTO_1 - IRQ_AUTO_7.
     74 */
     75void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
     76{
     77	if (handler)
     78		*auto_irqhandler_fixup = (u32)handler;
     79	flush_icache();
     80}
     81
     82/**
     83 * m68k_setup_user_interrupt
     84 * @vec: first user vector interrupt to handle
     85 * @cnt: number of active user vector interrupts
     86 *
     87 * setup user vector interrupts, this includes activating the specified range
     88 * of interrupts, only then these interrupts can be requested (note: this is
     89 * different from auto vector interrupts).
     90 */
     91void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt)
     92{
     93	int i;
     94
     95	BUG_ON(IRQ_USER + cnt > NR_IRQS);
     96	m68k_first_user_vec = vec;
     97	for (i = 0; i < cnt; i++)
     98		irq_set_chip_and_handler(i, &user_irq_chip, handle_simple_irq);
     99	*user_irqvec_fixup = vec - IRQ_USER;
    100	flush_icache();
    101}
    102
    103/**
    104 * m68k_setup_irq_controller
    105 * @chip: irq chip which controls specified irq
    106 * @handle: flow handler which handles specified irq
    107 * @irq: first irq to be managed by the controller
    108 * @cnt: number of irqs to be managed by the controller
    109 *
    110 * Change the controller for the specified range of irq, which will be used to
    111 * manage these irq. auto/user irq already have a default controller, which can
    112 * be changed as well, but the controller probably should use m68k_irq_startup/
    113 * m68k_irq_shutdown.
    114 */
    115void m68k_setup_irq_controller(struct irq_chip *chip,
    116			       irq_flow_handler_t handle, unsigned int irq,
    117			       unsigned int cnt)
    118{
    119	int i;
    120
    121	for (i = 0; i < cnt; i++) {
    122		irq_set_chip(irq + i, chip);
    123		if (handle)
    124			irq_set_handler(irq + i, handle);
    125	}
    126}
    127
    128unsigned int m68k_irq_startup_irq(unsigned int irq)
    129{
    130	if (irq <= IRQ_AUTO_7)
    131		vectors[VEC_SPUR + irq] = auto_inthandler;
    132	else
    133		vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
    134	return 0;
    135}
    136
    137unsigned int m68k_irq_startup(struct irq_data *data)
    138{
    139	return m68k_irq_startup_irq(data->irq);
    140}
    141
    142void m68k_irq_shutdown(struct irq_data *data)
    143{
    144	unsigned int irq = data->irq;
    145
    146	if (irq <= IRQ_AUTO_7)
    147		vectors[VEC_SPUR + irq] = bad_inthandler;
    148	else
    149		vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
    150}
    151
    152
    153unsigned int irq_canonicalize(unsigned int irq)
    154{
    155#ifdef CONFIG_Q40
    156	if (MACH_IS_Q40 && irq == 11)
    157		irq = 10;
    158#endif
    159	return irq;
    160}
    161
    162EXPORT_SYMBOL(irq_canonicalize);
    163
    164
    165asmlinkage void handle_badint(struct pt_regs *regs)
    166{
    167	atomic_inc(&irq_err_count);
    168	pr_warn("unexpected interrupt from %u\n", regs->vector);
    169}