1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * OpenRISC irq.c !! 2 * This file is subject to the terms and conditions of the GNU General Public
>> 3 * License. See the file "COPYING" in the main directory of this archive
>> 4 * for more details.
4 * 5 *
5 * Linux architectural port borrowing liberall !! 6 * Code to handle x86 style IRQs plus some generic interrupt stuff.
6 * others. All original copyrights apply as p <<
7 * declaration. <<
8 * 7 *
9 * Modifications for the OpenRISC architecture !! 8 * Copyright (C) 1992 Linus Torvalds
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@s !! 9 * Copyright (C) 1994 - 2000 Ralf Baechle
11 */ 10 */
12 !! 11 #include <linux/kernel.h>
13 #include <linux/interrupt.h> !! 12 #include <linux/delay.h>
14 #include <linux/init.h> 13 #include <linux/init.h>
>> 14 #include <linux/interrupt.h>
>> 15 #include <linux/kernel_stat.h>
>> 16 #include <linux/proc_fs.h>
>> 17 #include <linux/mm.h>
>> 18 #include <linux/random.h>
>> 19 #include <linux/sched.h>
>> 20 #include <linux/seq_file.h>
>> 21 #include <linux/kallsyms.h>
>> 22 #include <linux/kgdb.h>
15 #include <linux/ftrace.h> 23 #include <linux/ftrace.h>
16 #include <linux/irq.h> !! 24 #include <linux/irqdomain.h>
17 #include <linux/irqchip.h> !! 25
18 #include <linux/export.h> !! 26 #include <linux/atomic.h>
19 #include <linux/irqflags.h> !! 27 #include <linux/uaccess.h>
20 28
21 /* read interrupt enabled status */ !! 29 void *irq_stack[NR_CPUS];
22 unsigned long arch_local_save_flags(void) !! 30
>> 31 /*
>> 32 * 'what should we do if we get a hw irq event on an illegal vector'.
>> 33 * each architecture has to answer this themselves.
>> 34 */
>> 35 void ack_bad_irq(unsigned int irq)
23 { 36 {
24 return mfspr(SPR_SR) & (SPR_SR_IEE|SPR !! 37 printk("unexpected IRQ # %d\n", irq);
25 } 38 }
26 EXPORT_SYMBOL(arch_local_save_flags); <<
27 39
28 /* set interrupt enabled status */ !! 40 atomic_t irq_err_count;
29 void arch_local_irq_restore(unsigned long flag !! 41
>> 42 int arch_show_interrupts(struct seq_file *p, int prec)
30 { 43 {
31 mtspr(SPR_SR, ((mfspr(SPR_SR) & ~(SPR_ !! 44 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
>> 45 return 0;
>> 46 }
>> 47
>> 48 asmlinkage void spurious_interrupt(void)
>> 49 {
>> 50 atomic_inc(&irq_err_count);
32 } 51 }
33 EXPORT_SYMBOL(arch_local_irq_restore); <<
34 52
35 void __init init_IRQ(void) 53 void __init init_IRQ(void)
36 { 54 {
37 irqchip_init(); !! 55 int i;
>> 56 unsigned int order = get_order(IRQ_STACK_SIZE);
>> 57
>> 58 for (i = 0; i < NR_IRQS; i++)
>> 59 irq_set_noprobe(i);
>> 60
>> 61 if (cpu_has_veic)
>> 62 clear_c0_status(ST0_IM);
>> 63
>> 64 arch_init_irq();
>> 65
>> 66 for_each_possible_cpu(i) {
>> 67 void *s = (void *)__get_free_pages(GFP_KERNEL, order);
>> 68
>> 69 irq_stack[i] = s;
>> 70 pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,
>> 71 irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE);
>> 72 }
>> 73 }
>> 74
>> 75 #ifdef CONFIG_DEBUG_STACKOVERFLOW
>> 76 static inline void check_stack_overflow(void)
>> 77 {
>> 78 unsigned long sp;
>> 79
>> 80 __asm__ __volatile__("move %0, $sp" : "=r" (sp));
>> 81 sp &= THREAD_MASK;
>> 82
>> 83 /*
>> 84 * Check for stack overflow: is there less than STACK_WARN free?
>> 85 * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
>> 86 */
>> 87 if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
>> 88 printk("do_IRQ: stack overflow: %ld\n",
>> 89 sp - sizeof(struct thread_info));
>> 90 dump_stack();
>> 91 }
>> 92 }
>> 93 #else
>> 94 static inline void check_stack_overflow(void) {}
>> 95 #endif
>> 96
>> 97
>> 98 /*
>> 99 * do_IRQ handles all normal device IRQ's (the special
>> 100 * SMP cross-CPU interrupts have their own specific
>> 101 * handlers).
>> 102 */
>> 103 void __irq_entry do_IRQ(unsigned int irq)
>> 104 {
>> 105 irq_enter();
>> 106 check_stack_overflow();
>> 107 generic_handle_irq(irq);
>> 108 irq_exit();
>> 109 }
>> 110
>> 111 #ifdef CONFIG_IRQ_DOMAIN
>> 112 void __irq_entry do_domain_IRQ(struct irq_domain *domain, unsigned int hwirq)
>> 113 {
>> 114 irq_enter();
>> 115 check_stack_overflow();
>> 116 generic_handle_domain_irq(domain, hwirq);
>> 117 irq_exit();
38 } 118 }
>> 119 #endif
39 120
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