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https://github.com/torvalds/linux
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cb2224d7c4
allocate_irqno, free_irqno and alloc_legacy_irqno are a simple allocator for interrupt numbers from the days when the numer of interrupts was still fixed to NR_IRQS. This was necessary for the SGI IP27 architecture which with its flexible architecture and possibly large number of interrupts doesn't easily fit into the old pattern. These days there are better alternatives. Move the allocation code from the arch generic code to the only platform using it, the SGI IP27 aka Origin 200/2000, Onyx 2. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
95 lines
2 KiB
C
95 lines
2 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Code to handle x86 style IRQs plus some generic interrupt stuff.
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*
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* Copyright (C) 1992 Linus Torvalds
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* Copyright (C) 1994 - 2000 Ralf Baechle
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*/
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/proc_fs.h>
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#include <linux/mm.h>
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#include <linux/random.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/kallsyms.h>
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#include <linux/kgdb.h>
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#include <linux/ftrace.h>
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#include <linux/atomic.h>
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#include <asm/uaccess.h>
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/*
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* 'what should we do if we get a hw irq event on an illegal vector'.
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* each architecture has to answer this themselves.
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*/
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void ack_bad_irq(unsigned int irq)
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{
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printk("unexpected IRQ # %d\n", irq);
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}
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atomic_t irq_err_count;
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
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return 0;
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}
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asmlinkage void spurious_interrupt(void)
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{
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atomic_inc(&irq_err_count);
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}
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void __init init_IRQ(void)
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{
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int i;
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for (i = 0; i < NR_IRQS; i++)
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irq_set_noprobe(i);
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arch_init_irq();
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}
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#ifdef CONFIG_DEBUG_STACKOVERFLOW
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static inline void check_stack_overflow(void)
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{
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unsigned long sp;
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__asm__ __volatile__("move %0, $sp" : "=r" (sp));
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sp &= THREAD_MASK;
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/*
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* Check for stack overflow: is there less than STACK_WARN free?
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* STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
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*/
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if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
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printk("do_IRQ: stack overflow: %ld\n",
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sp - sizeof(struct thread_info));
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dump_stack();
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}
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}
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#else
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static inline void check_stack_overflow(void) {}
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#endif
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/*
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* do_IRQ handles all normal device IRQ's (the special
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* SMP cross-CPU interrupts have their own specific
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* handlers).
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*/
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void __irq_entry do_IRQ(unsigned int irq)
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{
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irq_enter();
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check_stack_overflow();
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generic_handle_irq(irq);
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irq_exit();
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}
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