From: "H. Peter Anvin (Intel)" <hpa@xxxxxxxxx> Add external_interrupt() to dispatch external interrupts to their handlers. If an external interrupt is a system interrupt, dipatch it through system_interrupt_handler_table, otherwise call into dispatch_common_interrupt(). Signed-off-by: H. Peter Anvin (Intel) <hpa@xxxxxxxxx> Co-developed-by: Xin Li <xin3.li@xxxxxxxxx> Signed-off-by: Xin Li <xin3.li@xxxxxxxxx> --- arch/x86/kernel/traps.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index c0f7666140da..31ad645be2fb 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -1499,6 +1499,47 @@ void __init install_system_interrupt_handler(unsigned int n, const void *asm_add alloc_intr_gate(n, asm_addr); } +#ifndef CONFIG_X86_LOCAL_APIC +/* + * Used when local APIC is not compiled into the kernel, but + * external_interrupt() needs dispatch_spurious_interrupt(). + */ +DEFINE_IDTENTRY_IRQ(spurious_interrupt) +{ + pr_info("Spurious interrupt (vector 0x%x) on CPU#%d, should never happen.\n", + vector, smp_processor_id()); +} +#endif + +/* + * External interrupt dispatch function. + * + * Until/unless dispatch_common_interrupt() can be taught to deal with the + * special system vectors, split the dispatch. + * + * Note: dispatch_common_interrupt() already deals with IRQ_MOVE_CLEANUP_VECTOR. + */ +int external_interrupt(struct pt_regs *regs, unsigned int vector) +{ + unsigned int sysvec = vector - FIRST_SYSTEM_VECTOR; + + if (vector < FIRST_EXTERNAL_VECTOR) { + pr_err("invalid external interrupt vector %d\n", vector); + return -EINVAL; + } + + if (sysvec < NR_SYSTEM_VECTORS) { + if (system_interrupt_handlers[sysvec]) + system_interrupt_handlers[sysvec](regs); + else + dispatch_spurious_interrupt(regs, vector); + } else { + dispatch_common_interrupt(regs, vector); + } + + return 0; +} + void __init trap_init(void) { /* Init cpu_entry_area before IST entries are set up */ -- 2.34.1