diff options
Diffstat (limited to 'linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/mach-xen/irq_vectors.h')
| -rw-r--r-- | linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/mach-xen/irq_vectors.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/mach-xen/irq_vectors.h b/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/mach-xen/irq_vectors.h new file mode 100644 index 0000000000..f72c14da1f --- /dev/null +++ b/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/mach-xen/irq_vectors.h @@ -0,0 +1,138 @@ +/* + * This file should contain #defines for all of the interrupt vector + * numbers used by this architecture. + * + * In addition, there are some standard defines: + * + * FIRST_EXTERNAL_VECTOR: + * The first free place for external interrupts + * + * SYSCALL_VECTOR: + * The IRQ vector a syscall makes the user to kernel transition + * under. + * + * TIMER_IRQ: + * The IRQ number the timer interrupt comes in at. + * + * NR_IRQS: + * The total number of interrupt vectors (including all the + * architecture specific interrupts) needed. + * + */ +#ifndef _ASM_IRQ_VECTORS_H +#define _ASM_IRQ_VECTORS_H + +/* + * IDT vectors usable for external interrupt sources start + * at 0x20: + */ +#define FIRST_EXTERNAL_VECTOR 0x20 + +#define SYSCALL_VECTOR 0x80 + +/* + * Vectors 0x20-0x2f are used for ISA interrupts. + */ + +#if 0 +/* + * 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 0xfd +#define RESCHEDULE_VECTOR 0xfc +#define CALL_FUNCTION_VECTOR 0xfb + +#define THERMAL_APIC_VECTOR 0xf0 +/* + * 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 LOCAL_TIMER_VECTOR 0xef +#endif + +#define SPURIOUS_APIC_VECTOR 0xff +#define ERROR_APIC_VECTOR 0xfe + +/* + * 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 FIRST_DEVICE_VECTOR 0x31 +#define FIRST_SYSTEM_VECTOR 0xef + +/* + * 16 8259A IRQ's, 208 potential APIC interrupt sources. + * Right now the APIC is mostly only used for SMP. + * 256 vectors is an architectural limit. (we can have + * more than 256 devices theoretically, but they will + * have to use shared interrupts) + * Since vectors 0x00-0x1f are used/reserved for the CPU, + * the usable vector space is 0x20-0xff (224 vectors) + */ + +#define NR_IPIS 8 + +#define RESCHEDULE_VECTOR 1 +#define INVALIDATE_TLB_VECTOR 2 +#define CALL_FUNCTION_VECTOR 3 + +/* + * The maximum number of vectors supported by i386 processors + * is limited to 256. For processors other than i386, NR_VECTORS + * should be changed accordingly. + */ +#define NR_VECTORS 256 + +#define FPU_IRQ 13 + +#define FIRST_VM86_IRQ 3 +#define LAST_VM86_IRQ 15 +#define invalid_vm86_irq(irq) ((irq) < 3 || (irq) > 15) + +/* + * The flat IRQ space is divided into two regions: + * 1. A one-to-one mapping of real physical IRQs. This space is only used + * if we have physical device-access privilege. This region is at the + * start of the IRQ space so that existing device drivers do not need + * to be modified to translate physical IRQ numbers into our IRQ space. + * 3. A dynamic mapping of inter-domain and Xen-sourced virtual IRQs. These + * are bound using the provided bind/unbind functions. + */ + +#define PIRQ_BASE 0 +#define NR_PIRQS 256 + +#define DYNIRQ_BASE (PIRQ_BASE + NR_PIRQS) +#define NR_DYNIRQS 256 + +#define NR_IRQS (NR_PIRQS + NR_DYNIRQS) +#define NR_IRQ_VECTORS NR_IRQS + +#define pirq_to_irq(_x) ((_x) + PIRQ_BASE) +#define irq_to_pirq(_x) ((_x) - PIRQ_BASE) + +#define dynirq_to_irq(_x) ((_x) + DYNIRQ_BASE) +#define irq_to_dynirq(_x) ((_x) - DYNIRQ_BASE) + +#ifndef __ASSEMBLY__ +/* Dynamic binding of event channels and VIRQ sources to Linux IRQ space. */ +extern int bind_virq_to_irq(int virq); +extern void unbind_virq_from_irq(int virq); +extern int bind_ipi_to_irq(int ipi); +extern void unbind_ipi_from_irq(int ipi); +extern int bind_evtchn_to_irq(int evtchn); +extern void unbind_evtchn_from_irq(int evtchn); + +extern void irq_suspend(void); +extern void irq_resume(void); +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_IRQ_VECTORS_H */ |