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https://github.com/torvalds/linux
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This avoids some potential stack overflows with very deep softirq callchains. i386 does this too. TOADD CFI annotation Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
#ifndef _ASM_IRQ_H
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#define _ASM_IRQ_H
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/*
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* linux/include/asm/irq.h
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*
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* (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
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*
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* IRQ/IPI changes taken from work by Thomas Radke
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* <tomsoft@informatik.tu-chemnitz.de>
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*/
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#define TIMER_IRQ 0
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/*
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* 16 8259A IRQ's, 208 potential APIC interrupt sources.
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* Right now the APIC is mostly only used for SMP.
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* 256 vectors is an architectural limit. (we can have
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* more than 256 devices theoretically, but they will
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* have to use shared interrupts)
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* Since vectors 0x00-0x1f are used/reserved for the CPU,
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* the usable vector space is 0x20-0xff (224 vectors)
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*/
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/*
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* The maximum number of vectors supported by x86_64 processors
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* is limited to 256. For processors other than x86_64, NR_VECTORS
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* should be changed accordingly.
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*/
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#define NR_VECTORS 256
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#define FIRST_SYSTEM_VECTOR 0xef /* duplicated in hw_irq.h */
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#ifdef CONFIG_PCI_MSI
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#define NR_IRQS FIRST_SYSTEM_VECTOR
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#define NR_IRQ_VECTORS NR_IRQS
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#else
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#define NR_IRQS 224
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#define NR_IRQ_VECTORS 1024
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#endif
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static __inline__ int irq_canonicalize(int irq)
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{
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return ((irq == 2) ? 9 : irq);
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}
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#ifdef CONFIG_X86_LOCAL_APIC
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#define ARCH_HAS_NMI_WATCHDOG /* See include/linux/nmi.h */
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#endif
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struct irqaction;
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struct pt_regs;
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int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
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#ifdef CONFIG_HOTPLUG_CPU
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#include <linux/cpumask.h>
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extern void fixup_irqs(cpumask_t map);
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#endif
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#define __ARCH_HAS_DO_SOFTIRQ 1
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#endif /* _ASM_IRQ_H */
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