diff options
Diffstat (limited to 'include/asm-i386/hw_irq.h')
| -rw-r--r-- | include/asm-i386/hw_irq.h | 36 |
1 files changed, 17 insertions, 19 deletions
diff --git a/include/asm-i386/hw_irq.h b/include/asm-i386/hw_irq.h index 413a98c55..0c883af9d 100644 --- a/include/asm-i386/hw_irq.h +++ b/include/asm-i386/hw_irq.h @@ -28,36 +28,34 @@ */ /* - * Special IRQ vectors used by the SMP architecture, 0x30-0x4f + * Special IRQ vectors used by the SMP architecture, 0xf0-0xff * * some of the following vectors are 'rare', they are merged * into a single vector (CALL_FUNCTION_VECTOR) to save vector space. * TLB, reschedule and local APIC vectors are performance-critical. + * + * Vectors 0xf0-0xfa are free (reserved for future Linux use). */ -#define INVALIDATE_TLB_VECTOR 0x30 -#define LOCAL_TIMER_VECTOR 0x31 -#define RESCHEDULE_VECTOR 0x40 - -/* 'rare' vectors: */ -#define CALL_FUNCTION_VECTOR 0x41 +#define SPURIOUS_APIC_VECTOR 0xff +#define ERROR_APIC_VECTOR 0xfe +#define INVALIDATE_TLB_VECTOR 0xfd +#define RESCHEDULE_VECTOR 0xfc +#define CALL_FUNCTION_VECTOR 0xfb /* - * These IRQs should never really happen on perfect hardware running - * a perfect kernel, but we nevertheless print a message to catch the - * rest ;) Subtle, the APIC architecture mandates the spurious vector - * to have bits 0-3 set to 1. Note that these vectors do not occur - * normally, so we violate the 'only 2 vectors per priority level' - * rule here. + * Local APIC timer IRQ vector is on a different priority level, + * to work around the 'lost local interrupt if more than 2 IRQ + * sources per level' errata. */ -#define SPURIOUS_APIC_VECTOR 0x3f -#define ERROR_APIC_VECTOR 0x43 +#define LOCAL_TIMER_VECTOR 0xef /* - * First APIC vector available to drivers: (vectors 0x51-0xfe) - * we start at 0x51 to spread out vectors between priority levels - * evenly. (note that 0x80 is the syscall vector) + * First APIC vector available to drivers: (vectors 0x30-0xee) + * we start at 0x31 to spread out vectors evenly between priority + * levels. (0x80 is the syscall vector) */ -#define IRQ0_TRAP_VECTOR 0x51 +#define FIRST_DEVICE_VECTOR 0x31 +#define FIRST_SYSTEM_VECTOR 0xef extern int irq_vector[NR_IRQS]; #define IO_APIC_VECTOR(irq) irq_vector[irq] |