1 // SPDX-License-Identifier: GPL-2.0 !! 1 /*
2 // Copyright (C) 2018 Hangzhou C-SKY Microsyst !! 2 * This file is subject to the terms and conditions of the GNU General Public
3 !! 3 * License. See the file "COPYING" in the main directory of this archive
>> 4 * for more details.
>> 5 *
>> 6 * Code to handle x86 style IRQs plus some generic interrupt stuff.
>> 7 *
>> 8 * Copyright (C) 1992 Linus Torvalds
>> 9 * Copyright (C) 1994 - 2000 Ralf Baechle
>> 10 */
>> 11 #include <linux/kernel.h>
>> 12 #include <linux/delay.h>
4 #include <linux/init.h> 13 #include <linux/init.h>
5 #include <linux/interrupt.h> 14 #include <linux/interrupt.h>
6 #include <linux/irq.h> !! 15 #include <linux/kernel_stat.h>
7 #include <linux/irqchip.h> !! 16 #include <linux/proc_fs.h>
8 #include <asm/traps.h> !! 17 #include <linux/mm.h>
9 #include <asm/smp.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>
>> 23 #include <linux/ftrace.h>
>> 24
>> 25 #include <linux/atomic.h>
>> 26 #include <linux/uaccess.h>
>> 27
>> 28 void *irq_stack[NR_CPUS];
>> 29
>> 30 /*
>> 31 * 'what should we do if we get a hw irq event on an illegal vector'.
>> 32 * each architecture has to answer this themselves.
>> 33 */
>> 34 void ack_bad_irq(unsigned int irq)
>> 35 {
>> 36 printk("unexpected IRQ # %d\n", irq);
>> 37 }
>> 38
>> 39 atomic_t irq_err_count;
>> 40
>> 41 int arch_show_interrupts(struct seq_file *p, int prec)
>> 42 {
>> 43 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
>> 44 return 0;
>> 45 }
>> 46
>> 47 asmlinkage void spurious_interrupt(void)
>> 48 {
>> 49 atomic_inc(&irq_err_count);
>> 50 }
10 51
11 void __init init_IRQ(void) 52 void __init init_IRQ(void)
12 { 53 {
13 irqchip_init(); !! 54 int i;
14 #ifdef CONFIG_SMP !! 55 unsigned int order = get_order(IRQ_STACK_SIZE);
15 setup_smp_ipi(); !! 56
>> 57 for (i = 0; i < NR_IRQS; i++)
>> 58 irq_set_noprobe(i);
>> 59
>> 60 if (cpu_has_veic)
>> 61 clear_c0_status(ST0_IM);
>> 62
>> 63 arch_init_irq();
>> 64
>> 65 for_each_possible_cpu(i) {
>> 66 void *s = (void *)__get_free_pages(GFP_KERNEL, order);
>> 67
>> 68 irq_stack[i] = s;
>> 69 pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,
>> 70 irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE);
>> 71 }
>> 72 }
>> 73
>> 74 #ifdef CONFIG_DEBUG_STACKOVERFLOW
>> 75 static inline void check_stack_overflow(void)
>> 76 {
>> 77 unsigned long sp;
>> 78
>> 79 __asm__ __volatile__("move %0, $sp" : "=r" (sp));
>> 80 sp &= THREAD_MASK;
>> 81
>> 82 /*
>> 83 * Check for stack overflow: is there less than STACK_WARN free?
>> 84 * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
>> 85 */
>> 86 if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
>> 87 printk("do_IRQ: stack overflow: %ld\n",
>> 88 sp - sizeof(struct thread_info));
>> 89 dump_stack();
>> 90 }
>> 91 }
>> 92 #else
>> 93 static inline void check_stack_overflow(void) {}
16 #endif 94 #endif
>> 95
>> 96
>> 97 /*
>> 98 * do_IRQ handles all normal device IRQ's (the special
>> 99 * SMP cross-CPU interrupts have their own specific
>> 100 * handlers).
>> 101 */
>> 102 void __irq_entry do_IRQ(unsigned int irq)
>> 103 {
>> 104 irq_enter();
>> 105 check_stack_overflow();
>> 106 generic_handle_irq(irq);
>> 107 irq_exit();
17 } 108 }
>> 109
18 110
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